diff options
| author | /dev/humancontroller <devhc@example.com> | 2015-03-28 01:21:52 +0100 |
|---|---|---|
| committer | /dev/humancontroller <devhc@example.com> | 2017-01-26 07:16:57 +0100 |
| commit | e9d273f7b0544b03e4d73e1078b2755fef0e05f7 (patch) | |
| tree | 4fa9863c0a41a444a0afc145411480ced8e4351d /src/opusfile-0.5/include/opusfile.h | |
| parent | f45fbef604e05144057dec8d1dbfc5d4f5a2a822 (diff) | |
remove most libraries from the source tree
Diffstat (limited to 'src/opusfile-0.5/include/opusfile.h')
| -rw-r--r-- | src/opusfile-0.5/include/opusfile.h | 2089 |
1 files changed, 0 insertions, 2089 deletions
diff --git a/src/opusfile-0.5/include/opusfile.h b/src/opusfile-0.5/include/opusfile.h deleted file mode 100644 index 850cd6b9..00000000 --- a/src/opusfile-0.5/include/opusfile.h +++ /dev/null @@ -1,2089 +0,0 @@ -/******************************************************************** - * * - * THIS FILE IS PART OF THE libopusfile SOFTWARE CODEC SOURCE CODE. * - * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * - * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * - * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * - * * - * THE libopusfile SOURCE CODE IS (C) COPYRIGHT 1994-2012 * - * by the Xiph.Org Foundation and contributors http://www.xiph.org/ * - * * - ******************************************************************** - - function: stdio-based convenience library for opening/seeking/decoding - last mod: $Id: vorbisfile.h 17182 2010-04-29 03:48:32Z xiphmont $ - - ********************************************************************/ -#if !defined(_opusfile_h) -# define _opusfile_h (1) - -/**\mainpage - \section Introduction - - This is the documentation for the <tt>libopusfile</tt> C API. - - The <tt>libopusfile</tt> package provides a convenient high-level API for - decoding and basic manipulation of all Ogg Opus audio streams. - <tt>libopusfile</tt> is implemented as a layer on top of Xiph.Org's - reference - <tt><a href="https://www.xiph.org/ogg/doc/libogg/reference.html">libogg</a></tt> - and - <tt><a href="https://mf4.xiph.org/jenkins/view/opus/job/opus/ws/doc/html/index.html">libopus</a></tt> - libraries. - - <tt>libopusfile</tt> provides several sets of built-in routines for - file/stream access, and may also use custom stream I/O routines provided by - the embedded environment. - There are built-in I/O routines provided for ANSI-compliant - <code>stdio</code> (<code>FILE *</code>), memory buffers, and URLs - (including <file:> URLs, plus optionally <http:> and <https:> URLs). - - \section Organization - - The main API is divided into several sections: - - \ref stream_open_close - - \ref stream_info - - \ref stream_decoding - - \ref stream_seeking - - Several additional sections are not tied to the main API. - - \ref stream_callbacks - - \ref header_info - - \ref error_codes - - \section Overview - - The <tt>libopusfile</tt> API always decodes files to 48 kHz. - The original sample rate is not preserved by the lossy compression, though - it is stored in the header to allow you to resample to it after decoding - (the <tt>libopusfile</tt> API does not currently provide a resampler, - but the - <a href="http://www.speex.org/docs/manual/speex-manual/node7.html#SECTION00760000000000000000">the - Speex resampler</a> is a good choice if you need one). - In general, if you are playing back the audio, you should leave it at - 48 kHz, provided your audio hardware supports it. - When decoding to a file, it may be worth resampling back to the original - sample rate, so as not to surprise users who might not expect the sample - rate to change after encoding to Opus and decoding. - - Opus files can contain anywhere from 1 to 255 channels of audio. - The channel mappings for up to 8 channels are the same as the - <a href="http://www.xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-800004.3.9">Vorbis - mappings</a>. - A special stereo API can convert everything to 2 channels, making it simple - to support multichannel files in an application which only has stereo - output. - Although the <tt>libopusfile</tt> ABI provides support for the theoretical - maximum number of channels, the current implementation does not support - files with more than 8 channels, as they do not have well-defined channel - mappings. - - Like all Ogg files, Opus files may be "chained". - That is, multiple Opus files may be combined into a single, longer file just - by concatenating the original files. - This is commonly done in internet radio streaming, as it allows the title - and artist to be updated each time the song changes, since each link in the - chain includes its own set of metadata. - - <tt>libopusfile</tt> fully supports chained files. - It will decode the first Opus stream found in each link of a chained file - (ignoring any other streams that might be concurrently multiplexed with it, - such as a video stream). - - The channel count can also change between links. - If your application is not prepared to deal with this, it can use the stereo - API to ensure the audio from all links will always get decoded into a - common format. - Since <tt>libopusfile</tt> always decodes to 48 kHz, you do not have to - worry about the sample rate changing between links (as was possible with - Vorbis). - This makes application support for chained files with <tt>libopusfile</tt> - very easy.*/ - -# if defined(__cplusplus) -extern "C" { -# endif - -# include <stdarg.h> -# include <stdio.h> -# include <ogg/ogg.h> -# include <opus_multistream.h> - -/**@cond PRIVATE*/ - -/*Enable special features for gcc and gcc-compatible compilers.*/ -# if !defined(OP_GNUC_PREREQ) -# if defined(__GNUC__)&&defined(__GNUC_MINOR__) -# define OP_GNUC_PREREQ(_maj,_min) \ - ((__GNUC__<<16)+__GNUC_MINOR__>=((_maj)<<16)+(_min)) -# else -# define OP_GNUC_PREREQ(_maj,_min) 0 -# endif -# endif - -# if OP_GNUC_PREREQ(4,0) -# pragma GCC visibility push(default) -# endif - -typedef struct OpusHead OpusHead; -typedef struct OpusTags OpusTags; -typedef struct OpusPictureTag OpusPictureTag; -typedef struct OpusServerInfo OpusServerInfo; -typedef struct OpusFileCallbacks OpusFileCallbacks; -typedef struct OggOpusFile OggOpusFile; - -/*Warning attributes for libopusfile functions.*/ -# if OP_GNUC_PREREQ(3,4) -# define OP_WARN_UNUSED_RESULT __attribute__((__warn_unused_result__)) -# else -# define OP_WARN_UNUSED_RESULT -# endif -# if OP_GNUC_PREREQ(3,4) -# define OP_ARG_NONNULL(_x) __attribute__((__nonnull__(_x))) -# else -# define OP_ARG_NONNULL(_x) -# endif - -/**@endcond*/ - -/**\defgroup error_codes Error Codes*/ -/*@{*/ -/**\name List of possible error codes - Many of the functions in this library return a negative error code when a - function fails. - This list provides a brief explanation of the common errors. - See each individual function for more details on what a specific error code - means in that context.*/ -/*@{*/ - -/**A request did not succeed.*/ -#define OP_FALSE (-1) -/*Currently not used externally.*/ -#define OP_EOF (-2) -/**There was a hole in the page sequence numbers (e.g., a page was corrupt or - missing).*/ -#define OP_HOLE (-3) -/**An underlying read, seek, or tell operation failed when it should have - succeeded.*/ -#define OP_EREAD (-128) -/**A <code>NULL</code> pointer was passed where one was unexpected, or an - internal memory allocation failed, or an internal library error was - encountered.*/ -#define OP_EFAULT (-129) -/**The stream used a feature that is not implemented, such as an unsupported - channel family.*/ -#define OP_EIMPL (-130) -/**One or more parameters to a function were invalid.*/ -#define OP_EINVAL (-131) -/**A purported Ogg Opus stream did not begin with an Ogg page, a purported - header packet did not start with one of the required strings, "OpusHead" or - "OpusTags", or a link in a chained file was encountered that did not - contain any logical Opus streams.*/ -#define OP_ENOTFORMAT (-132) -/**A required header packet was not properly formatted, contained illegal - values, or was missing altogether.*/ -#define OP_EBADHEADER (-133) -/**The ID header contained an unrecognized version number.*/ -#define OP_EVERSION (-134) -/*Currently not used at all.*/ -#define OP_ENOTAUDIO (-135) -/**An audio packet failed to decode properly. - This is usually caused by a multistream Ogg packet where the durations of - the individual Opus packets contained in it are not all the same.*/ -#define OP_EBADPACKET (-136) -/**We failed to find data we had seen before, or the bitstream structure was - sufficiently malformed that seeking to the target destination was - impossible.*/ -#define OP_EBADLINK (-137) -/**An operation that requires seeking was requested on an unseekable stream.*/ -#define OP_ENOSEEK (-138) -/**The first or last granule position of a link failed basic validity checks.*/ -#define OP_EBADTIMESTAMP (-139) - -/*@}*/ -/*@}*/ - -/**\defgroup header_info Header Information*/ -/*@{*/ - -/**The maximum number of channels in an Ogg Opus stream.*/ -#define OPUS_CHANNEL_COUNT_MAX (255) - -/**Ogg Opus bitstream information. - This contains the basic playback parameters for a stream, and corresponds to - the initial ID header packet of an Ogg Opus stream.*/ -struct OpusHead{ - /**The Ogg Opus format version, in the range 0...255. - The top 4 bits represent a "major" version, and the bottom four bits - represent backwards-compatible "minor" revisions. - The current specification describes version 1. - This library will recognize versions up through 15 as backwards compatible - with the current specification. - An earlier draft of the specification described a version 0, but the only - difference between version 1 and version 0 is that version 0 did - not specify the semantics for handling the version field.*/ - int version; - /**The number of channels, in the range 1...255.*/ - int channel_count; - /**The number of samples that should be discarded from the beginning of the - stream.*/ - unsigned pre_skip; - /**The sampling rate of the original input. - All Opus audio is coded at 48 kHz, and should also be decoded at 48 kHz - for playback (unless the target hardware does not support this sampling - rate). - However, this field may be used to resample the audio back to the original - sampling rate, for example, when saving the output to a file.*/ - opus_uint32 input_sample_rate; - /**The gain to apply to the decoded output, in dB, as a Q8 value in the range - -32768...32767. - The <tt>libopusfile</tt> API will automatically apply this gain to the - decoded output before returning it, scaling it by - <code>pow(10,output_gain/(20.0*256))</code>.*/ - int output_gain; - /**The channel mapping family, in the range 0...255. - Channel mapping family 0 covers mono or stereo in a single stream. - Channel mapping family 1 covers 1 to 8 channels in one or more streams, - using the Vorbis speaker assignments. - Channel mapping family 255 covers 1 to 255 channels in one or more - streams, but without any defined speaker assignment.*/ - int mapping_family; - /**The number of Opus streams in each Ogg packet, in the range 1...255.*/ - int stream_count; - /**The number of coupled Opus streams in each Ogg packet, in the range - 0...127. - This must satisfy <code>0 <= coupled_count <= stream_count</code> and - <code>coupled_count + stream_count <= 255</code>. - The coupled streams appear first, before all uncoupled streams, in an Ogg - Opus packet.*/ - int coupled_count; - /**The mapping from coded stream channels to output channels. - Let <code>index=mapping[k]</code> be the value for channel <code>k</code>. - If <code>index<2*coupled_count</code>, then it refers to the left channel - from stream <code>(index/2)</code> if even, and the right channel from - stream <code>(index/2)</code> if odd. - Otherwise, it refers to the output of the uncoupled stream - <code>(index-coupled_count)</code>.*/ - unsigned char mapping[OPUS_CHANNEL_COUNT_MAX]; -}; - -/**The metadata from an Ogg Opus stream. - - This structure holds the in-stream metadata corresponding to the 'comment' - header packet of an Ogg Opus stream. - The comment header is meant to be used much like someone jotting a quick - note on the label of a CD. - It should be a short, to the point text note that can be more than a couple - words, but not more than a short paragraph. - - The metadata is stored as a series of (tag, value) pairs, in length-encoded - string vectors, using the same format as Vorbis (without the final "framing - bit"), Theora, and Speex, except for the packet header. - The first occurrence of the '=' character delimits the tag and value. - A particular tag may occur more than once, and order is significant. - The character set encoding for the strings is always UTF-8, but the tag - names are limited to ASCII, and treated as case-insensitive. - See <a href="http://www.xiph.org/vorbis/doc/v-comment.html">the Vorbis - comment header specification</a> for details. - - In filling in this structure, <tt>libopusfile</tt> will null-terminate the - #user_comments strings for safety. - However, the bitstream format itself treats them as 8-bit clean vectors, - possibly containing NUL characters, so the #comment_lengths array should be - treated as their authoritative length. - - This structure is binary and source-compatible with a - <code>vorbis_comment</code>, and pointers to it may be freely cast to - <code>vorbis_comment</code> pointers, and vice versa. - It is provided as a separate type to avoid introducing a compile-time - dependency on the libvorbis headers.*/ -struct OpusTags{ - /**The array of comment string vectors.*/ - char **user_comments; - /**An array of the corresponding length of each vector, in bytes.*/ - int *comment_lengths; - /**The total number of comment streams.*/ - int comments; - /**The null-terminated vendor string. - This identifies the software used to encode the stream.*/ - char *vendor; -}; - -/**\name Picture tag image formats*/ -/*@{*/ - -/**The MIME type was not recognized, or the image data did not match the - declared MIME type.*/ -#define OP_PIC_FORMAT_UNKNOWN (-1) -/**The MIME type indicates the image data is really a URL.*/ -#define OP_PIC_FORMAT_URL (0) -/**The image is a JPEG.*/ -#define OP_PIC_FORMAT_JPEG (1) -/**The image is a PNG.*/ -#define OP_PIC_FORMAT_PNG (2) -/**The image is a GIF.*/ -#define OP_PIC_FORMAT_GIF (3) - -/*@}*/ - -/**The contents of a METADATA_BLOCK_PICTURE tag.*/ -struct OpusPictureTag{ - /**The picture type according to the ID3v2 APIC frame: - <ol start="0"> - <li>Other</li> - <li>32x32 pixels 'file icon' (PNG only)</li> - <li>Other file icon</li> - <li>Cover (front)</li> - <li>Cover (back)</li> - <li>Leaflet page</li> - <li>Media (e.g. label side of CD)</li> - <li>Lead artist/lead performer/soloist</li> - <li>Artist/performer</li> - <li>Conductor</li> - <li>Band/Orchestra</li> - <li>Composer</li> - <li>Lyricist/text writer</li> - <li>Recording Location</li> - <li>During recording</li> - <li>During performance</li> - <li>Movie/video screen capture</li> - <li>A bright colored fish</li> - <li>Illustration</li> - <li>Band/artist logotype</li> - <li>Publisher/Studio logotype</li> - </ol> - Others are reserved and should not be used. - There may only be one each of picture type 1 and 2 in a file.*/ - opus_int32 type; - /**The MIME type of the picture, in printable ASCII characters 0x20-0x7E. - The MIME type may also be <code>"-->"</code> to signify that the data part - is a URL pointing to the picture instead of the picture data itself. - In this case, a terminating NUL is appended to the URL string in #data, - but #data_length is set to the length of the string excluding that - terminating NUL.*/ - char *mime_type; - /**The description of the picture, in UTF-8.*/ - char *description; - /**The width of the picture in pixels.*/ - opus_uint32 width; - /**The height of the picture in pixels.*/ - opus_uint32 height; - /**The color depth of the picture in bits-per-pixel (<em>not</em> - bits-per-channel).*/ - opus_uint32 depth; - /**For indexed-color pictures (e.g., GIF), the number of colors used, or 0 - for non-indexed pictures.*/ - opus_uint32 colors; - /**The length of the picture data in bytes.*/ - opus_uint32 data_length; - /**The binary picture data.*/ - unsigned char *data; - /**The format of the picture data, if known. - One of - <ul> - <li>#OP_PIC_FORMAT_UNKNOWN,</li> - <li>#OP_PIC_FORMAT_URL,</li> - <li>#OP_PIC_FORMAT_JPEG,</li> - <li>#OP_PIC_FORMAT_PNG, or</li> - <li>#OP_PIC_FORMAT_GIF.</li> - </ul>*/ - int format; -}; - -/**\name Functions for manipulating header data - - These functions manipulate the #OpusHead and #OpusTags structures, - which describe the audio parameters and tag-value metadata, respectively. - These can be used to query the headers returned by <tt>libopusfile</tt>, or - to parse Opus headers from sources other than an Ogg Opus stream, provided - they use the same format.*/ -/*@{*/ - -/**Parses the contents of the ID header packet of an Ogg Opus stream. - \param[out] _head Returns the contents of the parsed packet. - The contents of this structure are untouched on error. - This may be <code>NULL</code> to merely test the header - for validity. - \param[in] _data The contents of the ID header packet. - \param _len The number of bytes of data in the ID header packet. - \return 0 on success or a negative value on error. - \retval #OP_ENOTFORMAT If the data does not start with the "OpusHead" - string. - \retval #OP_EVERSION If the version field signaled a version this library - does not know how to parse. - \retval #OP_EIMPL If the channel mapping family was 255, which general - purpose players should not attempt to play. - \retval #OP_EBADHEADER If the contents of the packet otherwise violate the - Ogg Opus specification: - <ul> - <li>Insufficient data,</li> - <li>Too much data for the known minor versions,</li> - <li>An unrecognized channel mapping family,</li> - <li>Zero channels or too many channels,</li> - <li>Zero coded streams,</li> - <li>Too many coupled streams, or</li> - <li>An invalid channel mapping index.</li> - </ul>*/ -OP_WARN_UNUSED_RESULT int opus_head_parse(OpusHead *_head, - const unsigned char *_data,size_t _len) OP_ARG_NONNULL(2); - -/**Converts a granule position to a sample offset for a given Ogg Opus stream. - The sample offset is simply <code>_gp-_head->pre_skip</code>. - Granule position values smaller than OpusHead#pre_skip correspond to audio - that should never be played, and thus have no associated sample offset. - This function returns -1 for such values. - This function also correctly handles extremely large granule positions, - which may have wrapped around to a negative number when stored in a signed - ogg_int64_t value. - \param _head The #OpusHead information from the ID header of the stream. - \param _gp The granule position to convert. - \return The sample offset associated with the given granule position - (counting at a 48 kHz sampling rate), or the special value -1 on - error (i.e., the granule position was smaller than the pre-skip - amount).*/ -ogg_int64_t opus_granule_sample(const OpusHead *_head,ogg_int64_t _gp) - OP_ARG_NONNULL(1); - -/**Parses the contents of the 'comment' header packet of an Ogg Opus stream. - \param[out] _tags An uninitialized #OpusTags structure. - This returns the contents of the parsed packet. - The contents of this structure are untouched on error. - This may be <code>NULL</code> to merely test the header - for validity. - \param[in] _data The contents of the 'comment' header packet. - \param _len The number of bytes of data in the 'info' header packet. - \retval 0 Success. - \retval #OP_ENOTFORMAT If the data does not start with the "OpusTags" - string. - \retval #OP_EBADHEADER If the contents of the packet otherwise violate the - Ogg Opus specification. - \retval #OP_EFAULT If there wasn't enough memory to store the tags.*/ -OP_WARN_UNUSED_RESULT int opus_tags_parse(OpusTags *_tags, - const unsigned char *_data,size_t _len) OP_ARG_NONNULL(2); - -/**Performs a deep copy of an #OpusTags structure. - \param _dst The #OpusTags structure to copy into. - If this function fails, the contents of this structure remain - untouched. - \param _src The #OpusTags structure to copy from. - \retval 0 Success. - \retval #OP_EFAULT If there wasn't enough memory to copy the tags.*/ -int opus_tags_copy(OpusTags *_dst,const OpusTags *_src) OP_ARG_NONNULL(1); - -/**Initializes an #OpusTags structure. - This should be called on a freshly allocated #OpusTags structure before - attempting to use it. - \param _tags The #OpusTags structure to initialize.*/ -void opus_tags_init(OpusTags *_tags) OP_ARG_NONNULL(1); - -/**Add a (tag, value) pair to an initialized #OpusTags structure. - \note Neither opus_tags_add() nor opus_tags_add_comment() support values - containing embedded NULs, although the bitstream format does support them. - To add such tags, you will need to manipulate the #OpusTags structure - directly. - \param _tags The #OpusTags structure to add the (tag, value) pair to. - \param _tag A NUL-terminated, case-insensitive, ASCII string containing - the tag to add (without an '=' character). - \param _value A NUL-terminated UTF-8 containing the corresponding value. - \return 0 on success, or a negative value on failure. - \retval #OP_EFAULT An internal memory allocation failed.*/ -int opus_tags_add(OpusTags *_tags,const char *_tag,const char *_value) - OP_ARG_NONNULL(1) OP_ARG_NONNULL(2) OP_ARG_NONNULL(3); - -/**Add a comment to an initialized #OpusTags structure. - \note Neither opus_tags_add_comment() nor opus_tags_add() support comments - containing embedded NULs, although the bitstream format does support them. - To add such tags, you will need to manipulate the #OpusTags structure - directly. - \param _tags The #OpusTags structure to add the comment to. - \param _comment A NUL-terminated UTF-8 string containing the comment in - "TAG=value" form. - \return 0 on success, or a negative value on failure. - \retval #OP_EFAULT An internal memory allocation failed.*/ -int opus_tags_add_comment(OpusTags *_tags,const char *_comment) - OP_ARG_NONNULL(1) OP_ARG_NONNULL(2); - -/**Look up a comment value by its tag. - \param _tags An initialized #OpusTags structure. - \param _tag The tag to look up. - \param _count The instance of the tag. - The same tag can appear multiple times, each with a distinct - value, so an index is required to retrieve them all. - The order in which these values appear is significant and - should be preserved. - Use opus_tags_query_count() to get the legal range for the - \a _count parameter. - \return A pointer to the queried tag's value. - This points directly to data in the #OpusTags structure. - It should not be modified or freed by the application, and - modifications to the structure may invalidate the pointer. - \retval NULL If no matching tag is found.*/ -const char *opus_tags_query(const OpusTags *_tags,const char *_tag,int _count) - OP_ARG_NONNULL(1) OP_ARG_NONNULL(2); - -/**Look up the number of instances of a tag. - Call this first when querying for a specific tag and then iterate over the - number of instances with separate calls to opus_tags_query() to retrieve - all the values for that tag in order. - \param _tags An initialized #OpusTags structure. - \param _tag The tag to look up. - \return The number of instances of this particular tag.*/ -int opus_tags_query_count(const OpusTags *_tags,const char *_tag) - OP_ARG_NONNULL(1) OP_ARG_NONNULL(2); - -/**Get the track gain from an R128_TRACK_GAIN tag, if one was specified. - This searches for the first R128_TRACK_GAIN tag with a valid signed, - 16-bit decimal integer value and returns the value. - This routine is exposed merely for convenience for applications which wish - to do something special with the track gain (i.e., display it). - If you simply wish to apply the track gain instead of the header gain, you - can use op_set_gain_offset() with an #OP_TRACK_GAIN type and no offset. - \param _tags An initialized #OpusTags structure. - \param[out] _gain_q8 The track gain, in 1/256ths of a dB. - This will lie in the range [-32768,32767], and should - be applied in <em>addition</em> to the header gain. - On error, no value is returned, and the previous - contents remain unchanged. - \return 0 on success, or a negative value on error. - \retval #OP_FALSE There was no track gain available in the given tags.*/ -int opus_tags_get_track_gain(const OpusTags *_tags,int *_gain_q8) - OP_ARG_NONNULL(1) OP_ARG_NONNULL(2); - -/**Clears the #OpusTags structure. - This should be called on an #OpusTags structure after it is no longer - needed. - It will free all memory used by the structure members. - \param _tags The #OpusTags structure to clear.*/ -void opus_tags_clear(OpusTags *_tags) OP_ARG_NONNULL(1); - -/**Check if \a _comment is an instance of a \a _tag_name tag. - \see opus_tagncompare - \param _tag_name A NUL-terminated, case-insensitive, ASCII string containing - the name of the tag to check for (without the terminating - '=' character). - \param _comment The comment string to check. - \return An integer less than, equal to, or greater than zero if \a _comment - is found respectively, to be less than, to match, or be greater - than a "tag=value" string whose tag matches \a _tag_name.*/ -int opus_tagcompare(const char *_tag_name,const char *_comment); - -/**Check if \a _comment is an instance of a \a _tag_name tag. - This version is slightly more efficient than opus_tagcompare() if the length - of the tag name is already known (e.g., because it is a constant). - \see opus_tagcompare - \param _tag_name A case-insensitive ASCII string containing the name of the - tag to check for (without the terminating '=' character). - \param _tag_len The number of characters in the tag name. - This must be non-negative. - \param _comment The comment string to check. - \return An integer less than, equal to, or greater than zero if \a _comment - is found respectively, to be less than, to match, or be greater - than a "tag=value" string whose tag matches the first \a _tag_len - characters of \a _tag_name.*/ -int opus_tagncompare(const char *_tag_name,int _tag_len,const char *_comment); - -/**Parse a single METADATA_BLOCK_PICTURE tag. - This decodes the BASE64-encoded content of the tag and returns a structure - with the MIME type, description, image parameters (if known), and the - compressed image data. - If the MIME type indicates the presence of an image format we recognize - (JPEG, PNG, or GIF) and the actual image data contains the magic signature - associated with that format, then the OpusPictureTag::format field will be - set to the corresponding format. - This is provided as a convenience to avoid requiring applications to parse - the MIME type and/or do their own format detection for the commonly used - formats. - In this case, we also attempt to extract the image parameters directly from - the image data (overriding any that were present in the tag, which the - specification says applications are not meant to rely on). - The application must still provide its own support for actually decoding the - image data and, if applicable, retrieving that data from URLs. - \param[out] _pic Returns the parsed picture data. - No sanitation is done on the type, MIME type, or - description fields, so these might return invalid values. - The contents of this structure are left unmodified on - failure. - \param _tag The METADATA_BLOCK_PICTURE tag contents. - The leading "METADATA_BLOCK_PICTURE=" portion is optional, - to allow the function to be used on either directly on the - values in OpusTags::user_comments or on the return value - of opus_tags_query(). - \return 0 on success or a negative value on error. - \retval #OP_ENOTFORMAT The METADATA_BLOCK_PICTURE contents were not valid. - \retval #OP_EFAULT There was not enough memory to store the picture tag - contents.*/ -OP_WARN_UNUSED_RESULT int opus_picture_tag_parse(OpusPictureTag *_pic, - const char *_tag) OP_ARG_NONNULL(1) OP_ARG_NONNULL(2); - -/**Initializes an #OpusPictureTag structure. - This should be called on a freshly allocated #OpusPictureTag structure - before attempting to use it. - \param _pic The #OpusPictureTag structure to initialize.*/ -void opus_picture_tag_init(OpusPictureTag *_pic) OP_ARG_NONNULL(1); - -/**Clears the #OpusPictureTag structure. - This should be called on an #OpusPictureTag structure after it is no longer - needed. - It will free all memory used by the structure members. - \param _pic The #OpusPictureTag structure to clear.*/ -void opus_picture_tag_clear(OpusPictureTag *_pic) OP_ARG_NONNULL(1); - -/*@}*/ - -/*@}*/ - -/**\defgroup url_options URL Reading Options*/ -/*@{*/ -/**\name URL reading options - Options for op_url_stream_create() and associated functions. - These allow you to provide proxy configuration parameters, skip SSL - certificate checks, etc. - Options are processed in order, and if the same option is passed multiple - times, only the value specified by the last occurrence has an effect - (unless otherwise specified). - They may be expanded in the future.*/ -/*@{*/ - -/**@cond PRIVATE*/ - -/*These are the raw numbers used to define the request codes. - They should not be used directly.*/ -#define OP_SSL_SKIP_CERTIFICATE_CHECK_REQUEST (6464) -#define OP_HTTP_PROXY_HOST_REQUEST (6528) -#define OP_HTTP_PROXY_PORT_REQUEST (6592) -#define OP_HTTP_PROXY_USER_REQUEST (6656) -#define OP_HTTP_PROXY_PASS_REQUEST (6720) -#define OP_GET_SERVER_INFO_REQUEST (6784) - -#define OP_URL_OPT(_request) ((_request)+(char *)0) - -/*These macros trigger compilation errors or warnings if the wrong types are - provided to one of the URL options.*/ -#define OP_CHECK_INT(_x) ((void)((_x)==(opus_int32)0),(opus_int32)(_x)) -#define OP_CHECK_CONST_CHAR_PTR(_x) ((_x)+((_x)-(const char *)(_x))) -#define OP_CHECK_SERVER_INFO_PTR(_x) ((_x)+((_x)-(OpusServerInfo *)(_x))) - -/**@endcond*/ - -/**HTTP/Shoutcast/Icecast server information associated with a URL.*/ -struct OpusServerInfo{ - /**The name of the server (icy-name/ice-name). - This is <code>NULL</code> if there was no <code>icy-name</code> or - <code>ice-name</code> header.*/ - char *name; - /**A short description of the server (icy-description/ice-description). - This is <code>NULL</code> if there was no <code>icy-description</code> or - <code>ice-description</code> header.*/ - char *description; - /**The genre the server falls under (icy-genre/ice-genre). - This is <code>NULL</code> if there was no <code>icy-genre</code> or - <code>ice-genre</code> header.*/ - char *genre; - /**The homepage for the server (icy-url/ice-url). - This is <code>NULL</code> if there was no <code>icy-url</code> or - <code>ice-url</code> header.*/ - char *url; - /**The software used by the origin server (Server). - This is <code>NULL</code> if there was no <code>Server</code> header.*/ - char *server; - /**The media type of the entity sent to the recepient (Content-Type). - This is <code>NULL</code> if there was no <code>Content-Type</code> - header.*/ - char *content_type; - /**The nominal stream bitrate in kbps (icy-br/ice-bitrate). - This is <code>-1</code> if there was no <code>icy-br</code> or - <code>ice-bitrate</code> header.*/ - opus_int32 bitrate_kbps; - /**Flag indicating whether the server is public (<code>1</code>) or not - (<code>0</code>) (icy-pub/ice-public). - This is <code>-1</code> if there was no <code>icy-pub</code> or - <code>ice-public</code> header.*/ - int is_public; - /**Flag indicating whether the server is using HTTPS instead of HTTP. - This is <code>0</code> unless HTTPS is being used. - This may not match the protocol used in the original URL if there were - redirections.*/ - int is_ssl; -}; - -/**Initializes an #OpusServerInfo structure. - All fields are set as if the corresponding header was not available. - \param _info The #OpusServerInfo structure to initialize. - \note If you use this function, you must link against <tt>libopusurl</tt>.*/ -void opus_server_info_init(OpusServerInfo *_info) OP_ARG_NONNULL(1); - -/**Clears the #OpusServerInfo structure. - This should be called on an #OpusServerInfo structure after it is no longer - needed. - It will free all memory used by the structure members. - \param _info The #OpusServerInfo structure to clear. - \note If you use this function, you must link against <tt>libopusurl</tt>.*/ -void opus_server_info_clear(OpusServerInfo *_info) OP_ARG_NONNULL(1); - -/**Skip the certificate check when connecting via TLS/SSL (https). - \param _b <code>opus_int32</code>: Whether or not to skip the certificate - check. - The check will be skipped if \a _b is non-zero, and will not be - skipped if \a _b is zero. - \hideinitializer*/ -#define OP_SSL_SKIP_CERTIFICATE_CHECK(_b) \ - OP_URL_OPT(OP_SSL_SKIP_CERTIFICATE_CHECK_REQUEST),OP_CHECK_INT(_b) - -/**Proxy connections through the given host. - If no port is specified via #OP_HTTP_PROXY_PORT, the port number defaults - to 8080 (http-alt). - All proxy parameters are ignored for non-http and non-https URLs. - \param _host <code>const char *</code>: The proxy server hostname. - This may be <code>NULL</code> to disable the use of a proxy - server. - \hideinitializer*/ -#define OP_HTTP_PROXY_HOST(_host) \ - OP_URL_OPT(OP_HTTP_PROXY_HOST_REQUEST),OP_CHECK_CONST_CHAR_PTR(_host) - -/**Use the given port when proxying connections. - This option only has an effect if #OP_HTTP_PROXY_HOST is specified with a - non-<code>NULL</code> \a _host. - If this option is not provided, the proxy port number defaults to 8080 - (http-alt). - All proxy parameters are ignored for non-http and non-https URLs. - \param _port <code>opus_int32</code>: The proxy server port. - This must be in the range 0...65535 (inclusive), or the - URL function this is passed to will fail. - \hideinitializer*/ -#define OP_HTTP_PROXY_PORT(_port) \ - OP_URL_OPT(OP_HTTP_PROXY_PORT_REQUEST),OP_CHECK_INT(_port) - -/**Use the given user name for authentication when proxying connections. - All proxy parameters are ignored for non-http and non-https URLs. - \param _user const char *: The proxy server user name. - This may be <code>NULL</code> to disable proxy - authentication. - A non-<code>NULL</code> value only has an effect - if #OP_HTTP_PROXY_HOST and #OP_HTTP_PROXY_PASS - are also specified with non-<code>NULL</code> - arguments. - \hideinitializer*/ -#define OP_HTTP_PROXY_USER(_user) \ - OP_URL_OPT(OP_HTTP_PROXY_USER_REQUEST),OP_CHECK_CONST_CHAR_PTR(_user) - -/**Use the given password for authentication when proxying connections. - All proxy parameters are ignored for non-http and non-https URLs. - \param _pass const char *: The proxy server password. - This may be <code>NULL</code> to disable proxy - authentication. - A non-<code>NULL</code> value only has an effect - if #OP_HTTP_PROXY_HOST and #OP_HTTP_PROXY_USER - are also specified with non-<code>NULL</code> - arguments. - \hideinitializer*/ -#define OP_HTTP_PROXY_PASS(_pass) \ - OP_URL_OPT(OP_HTTP_PROXY_PASS_REQUEST),OP_CHECK_CONST_CHAR_PTR(_pass) - -/**Parse information about the streaming server (if any) and return it. - Very little validation is done. - In particular, OpusServerInfo::url may not be a valid URL, - OpusServerInfo::bitrate_kbps may not really be in kbps, and - OpusServerInfo::content_type may not be a valid MIME type. - The character set of the string fields is not specified anywhere, and should - not be assumed to be valid UTF-8. - \param _info OpusServerInfo *: Returns information about the server. - If there is any error opening the stream, the - contents of this structure remain - unmodified. - On success, fills in the structure with the - server information that was available, if - any. - After a successful return, the contents of - this structure should be freed by calling - opus_server_info_clear(). - \hideinitializer*/ -#define OP_GET_SERVER_INFO(_info) \ - OP_URL_OPT(OP_GET_SERVER_INFO_REQUEST),OP_CHECK_SERVER_INFO_PTR(_info) - -/*@}*/ -/*@}*/ - -/**\defgroup stream_callbacks Abstract Stream Reading Interface*/ -/*@{*/ -/**\name Functions for reading from streams - These functions define the interface used to read from and seek in a stream - of data. - A stream does not need to implement seeking, but the decoder will not be - able to seek if it does not do so. - These functions also include some convenience routines for working with - standard <code>FILE</code> pointers, complete streams stored in a single - block of memory, or URLs.*/ -/*@{*/ - -/**Reads up to \a _nbytes bytes of data from \a _stream. - \param _stream The stream to read from. - \param[out] _ptr The buffer to store the data in. - \param _nbytes The maximum number of bytes to read. - This function may return fewer, though it will not - return zero unless it reaches end-of-file. - \return The number of bytes successfully read, or a negative value on - error.*/ -typedef int (*op_read_func)(void *_stream,unsigned char *_ptr,int _nbytes); - -/**Sets the position indicator for \a _stream. - The new position, measured in bytes, is obtained by adding \a _offset - bytes to the position specified by \a _whence. - If \a _whence is set to <code>SEEK_SET</code>, <code>SEEK_CUR</code>, or - <code>SEEK_END</code>, the offset is relative to the start of the stream, - the current position indicator, or end-of-file, respectively. - \retval 0 Success. - \retval -1 Seeking is not supported or an error occurred. - <code>errno</code> need not be set.*/ -typedef int (*op_seek_func)(void *_stream,opus_int64 _offset,int _whence); - -/**Obtains the current value of the position indicator for \a _stream. - \return The current position indicator.*/ -typedef opus_int64 (*op_tell_func)(void *_stream); - -/**Closes the underlying stream. - \retval 0 Success. - \retval EOF An error occurred. - <code>errno</code> need not be set.*/ -typedef int (*op_close_func)(void *_stream); - -/**The callbacks used to access non-<code>FILE</code> stream resources. - The function prototypes are basically the same as for the stdio functions - <code>fread()</code>, <code>fseek()</code>, <code>ftell()</code>, and - <code>fclose()</code>. - The differences are that the <code>FILE *</code> arguments have been - replaced with a <code>void *</code>, which is to be used as a pointer to - whatever internal data these functions might need, that #seek and #tell - take and return 64-bit offsets, and that #seek <em>must</em> return -1 if - the stream is unseekable.*/ -struct OpusFileCallbacks{ - /**Used to read data from the stream. - This must not be <code>NULL</code>.*/ - op_read_func read; - /**Used to seek in the stream. - This may be <code>NULL</code> if seeking is not implemented.*/ - op_seek_func seek; - /**Used to return the current read position in the stream. - This may be <code>NULL</code> if seeking is not implemented.*/ - op_tell_func tell; - /**Used to close the stream when the decoder is freed. - This may be <code>NULL</code> to leave the stream open.*/ - op_close_func close; -}; - -/**Opens a stream with <code>fopen()</code> and fills in a set of callbacks - that can be used to access it. - This is useful to avoid writing your own portable 64-bit seeking wrappers, - and also avoids cross-module linking issues on Windows, where a - <code>FILE *</code> must be accessed by routines defined in the same module - that opened it. - \param[out] _cb The callbacks to use for this file. - If there is an error opening the file, nothing will be - filled in here. - \param _path The path to the file to open. - On Windows, this string must be UTF-8 (to allow access to - files whose names cannot be represented in the current - MBCS code page). - All other systems use the native character encoding. - \param _mode The mode to open the file in. - \return A stream handle to use with the callbacks, or <code>NULL</code> on - error.*/ -OP_WARN_UNUSED_RESULT void *op_fopen(OpusFileCallbacks *_cb, - const char *_path,const char *_mode) OP_ARG_NONNULL(1) OP_ARG_NONNULL(2) - OP_ARG_NONNULL(3); - -/**Opens a stream with <code>fdopen()</code> and fills in a set of callbacks - that can be used to access it. - This is useful to avoid writing your own portable 64-bit seeking wrappers, - and also avoids cross-module linking issues on Windows, where a - <code>FILE *</code> must be accessed by routines defined in the same module - that opened it. - \param[out] _cb The callbacks to use for this file. - If there is an error opening the file, nothing will be - filled in here. - \param _fd The file descriptor to open. - \param _mode The mode to open the file in. - \return A stream handle to use with the callbacks, or <code>NULL</code> on - error.*/ -OP_WARN_UNUSED_RESULT void *op_fdopen(OpusFileCallbacks *_cb, - int _fd,const char *_mode) OP_ARG_NONNULL(1) OP_ARG_NONNULL(3); - -/**Opens a stream with <code>freopen()</code> and fills in a set of callbacks - that can be used to access it. - This is useful to avoid writing your own portable 64-bit seeking wrappers, - and also avoids cross-module linking issues on Windows, where a - <code>FILE *</code> must be accessed by routines defined in the same module - that opened it. - \param[out] _cb The callbacks to use for this file. - If there is an error opening the file, nothing will be - filled in here. - \param _path The path to the file to open. - On Windows, this string must be UTF-8 (to allow access - to files whose names cannot be represented in the - current MBCS code page). - All other systems use the native character encoding. - \param _mode The mode to open the file in. - \param _stream A stream previously returned by op_fopen(), op_fdopen(), - or op_freopen(). - \return A stream handle to use with the callbacks, or <code>NULL</code> on - error.*/ -OP_WARN_UNUSED_RESULT void *op_freopen(OpusFileCallbacks *_cb, - const char *_path,const char *_mode,void *_stream) OP_ARG_NONNULL(1) - OP_ARG_NONNULL(2) OP_ARG_NONNULL(3) OP_ARG_NONNULL(4); - -/**Creates a stream that reads from the given block of memory. - This block of memory must contain the complete stream to decode. - This is useful for caching small streams (e.g., sound effects) in RAM. - \param[out] _cb The callbacks to use for this stream. - If there is an error creating the stream, nothing will be - filled in here. - \param _data The block of memory to read from. - \param _size The size of the block of memory. - \return A stream handle to use with the callbacks, or <code>NULL</code> on - error.*/ -OP_WARN_UNUSED_RESULT void *op_mem_stream_create(OpusFileCallbacks *_cb, - const unsigned char *_data,size_t _size) OP_ARG_NONNULL(1); - -/**Creates a stream that reads from the given URL. - This function behaves identically to op_url_stream_create(), except that it - takes a va_list instead of a variable number of arguments. - It does not call the <code>va_end</code> macro, and because it invokes the - <code>va_arg</code> macro, the value of \a _ap is undefined after the call. - \note If you use this function, you must link against <tt>libopusurl</tt>. - \param[out] _cb The callbacks to use for this stream. - If there is an error creating the stream, nothing will - be filled in here. - \param _url The URL to read from. - Currently only the <file:>, <http:>, and <https:> - schemes are supported. - Both <http:> and <https:> may be disabled at compile - time, in which case opening such URLs will always fail. - Currently this only supports URIs. - IRIs should be converted to UTF-8 and URL-escaped, with - internationalized domain names encoded in punycode, - before passing them to this function. - \param[in,out] _ap A list of the \ref url_options "optional flags" to use. - This is a variable-length list of options terminated - with <code>NULL</code>. - \return A stream handle to use with the callbacks, or <code>NULL</code> on - error.*/ -OP_WARN_UNUSED_RESULT void *op_url_stream_vcreate(OpusFileCallbacks *_cb, - const char *_url,va_list _ap) OP_ARG_NONNULL(1) OP_ARG_NONNULL(2); - -/**Creates a stream that reads from the given URL. - \note If you use this function, you must link against <tt>libopusurl</tt>. - \param[out] _cb The callbacks to use for this stream. - If there is an error creating the stream, nothing will be - filled in here. - \param _url The URL to read from. - Currently only the <file:>, <http:>, and <https:> schemes - are supported. - Both <http:> and <https:> may be disabled at compile time, - in which case opening such URLs will always fail. - Currently this only supports URIs. - IRIs should be converted to UTF-8 and URL-escaped, with - internationalized domain names encoded in punycode, before - passing them to this function. - \param ... The \ref url_options "optional flags" to use. - This is a variable-length list of options terminated with - <code>NULL</code>. - \return A stream handle to use with the callbacks, or <code>NULL</code> on - error.*/ -OP_WARN_UNUSED_RESULT void *op_url_stream_create(OpusFileCallbacks *_cb, - const char *_url,...) OP_ARG_NONNULL(1) OP_ARG_NONNULL(2); - -/*@}*/ -/*@}*/ - -/**\defgroup stream_open_close Opening and Closing*/ -/*@{*/ -/**\name Functions for opening and closing streams - - These functions allow you to test a stream to see if it is Opus, open it, - and close it. - Several flavors are provided for each of the built-in stream types, plus a - more general version which takes a set of application-provided callbacks.*/ -/*@{*/ - -/**Test to see if this is an Opus stream. - For good results, you will need at least 57 bytes (for a pure Opus-only - stream). - Something like 512 bytes will give more reliable results for multiplexed - streams. - This function is meant to be a quick-rejection filter. - Its purpose is not to guarantee that a stream is a valid Opus stream, but to - ensure that it looks enough like Opus that it isn't going to be recognized - as some other format (except possibly an Opus stream that is also - multiplexed with other codecs, such as video). - \param[out] _head The parsed ID header contents. - You may pass <code>NULL</code> if you do not need - this information. - If the function fails, the contents of this structure - remain untouched. - \param _initial_data An initial buffer of data from the start of the - stream. - \param _initial_bytes The number of bytes in \a _initial_data. - \return 0 if the data appears to be Opus, or a negative value on error. - \retval #OP_FALSE There was not enough data to tell if this was an Opus - stream or not. - \retval #OP_EFAULT An internal memory allocation failed. - \retval #OP_EIMPL The stream used a feature that is not implemented, - such as an unsupported channel family. - \retval #OP_ENOTFORMAT If the data did not contain a recognizable ID - header for an Opus stream. - \retval #OP_EVERSION If the version field signaled a version this library - does not know how to parse. - \retval #OP_EBADHEADER The ID header was not properly formatted or contained - illegal values.*/ -int op_test(OpusHead *_head, - const unsigned char *_initial_data,size_t _initial_bytes); - -/**Open a stream from the given file path. - \param _path The path to the file to open. - \param[out] _error Returns 0 on success, or a failure code on error. - You may pass in <code>NULL</code> if you don't want the - failure code. - The failure code will be #OP_EFAULT if the file could not - be opened, or one of the other failure codes from - op_open_callbacks() otherwise. - \return A freshly opened \c OggOpusFile, or <code>NULL</code> on error.*/ -OP_WARN_UNUSED_RESULT OggOpusFile *op_open_file(const char *_path,int *_error) - OP_ARG_NONNULL(1); - -/**Open a stream from a memory buffer. - \param _data The memory buffer to open. - \param _size The number of bytes in the buffer. - \param[out] _error Returns 0 on success, or a failure code on error. - You may pass in <code>NULL</code> if you don't want the - failure code. - See op_open_callbacks() for a full list of failure codes. - \return A freshly opened \c OggOpusFile, or <code>NULL</code> on error.*/ -OP_WARN_UNUSED_RESULT OggOpusFile *op_open_memory(const unsigned char *_data, - size_t _size,int *_error); - -/**Open a stream from a URL. - This function behaves identically to op_open_url(), except that it - takes a va_list instead of a variable number of arguments. - It does not call the <code>va_end</code> macro, and because it invokes the - <code>va_arg</code> macro, the value of \a _ap is undefined after the call. - \note If you use this function, you must link against <tt>libopusurl</tt>. - \param _url The URL to open. - Currently only the <file:>, <http:>, and <https:> - schemes are supported. - Both <http:> and <https:> may be disabled at compile - time, in which case opening such URLs will always - fail. - Currently this only supports URIs. - IRIs should be converted to UTF-8 and URL-escaped, - with internationalized domain names encoded in - punycode, before passing them to this function. - \param[out] _error Returns 0 on success, or a failure code on error. - You may pass in <code>NULL</code> if you don't want - the failure code. - See op_open_callbacks() for a full list of failure - codes. - \param[in,out] _ap A list of the \ref url_options "optional flags" to - use. - This is a variable-length list of options terminated - with <code>NULL</code>. - \return A freshly opened \c OggOpusFile, or <code>NULL</code> on error.*/ -OP_WARN_UNUSED_RESULT OggOpusFile *op_vopen_url(const char *_url, - int *_error,va_list _ap) OP_ARG_NONNULL(1); - -/**Open a stream from a URL. - \note If you use this function, you must link against <tt>libopusurl</tt>. - \param _url The URL to open. - Currently only the <file:>, <http:>, and <https:> schemes - are supported. - Both <http:> and <https:> may be disabled at compile - time, in which case opening such URLs will always fail. - Currently this only supports URIs. - IRIs should be converted to UTF-8 and URL-escaped, with - internationalized domain names encoded in punycode, - before passing them to this function. - \param[out] _error Returns 0 on success, or a failure code on error. - You may pass in <code>NULL</code> if you don't want the - failure code. - See op_open_callbacks() for a full list of failure codes. - \param ... The \ref url_options "optional flags" to use. - This is a variable-length list of options terminated with - <code>NULL</code>. - \return A freshly opened \c OggOpusFile, or <code>NULL</code> on error.*/ -OP_WARN_UNUSED_RESULT OggOpusFile *op_open_url(const char *_url, - int *_error,...) OP_ARG_NONNULL(1); - -/**Open a stream using the given set of callbacks to access it. - \param _source The stream to read from (e.g., a <code>FILE *</code>). - \param _cb The callbacks with which to access the stream. - <code><a href="#op_read_func">read()</a></code> must - be implemented. - <code><a href="#op_seek_func">seek()</a></code> and - <code><a href="#op_tell_func">tell()</a></code> may - be <code>NULL</code>, or may always return -1 to - indicate a source is unseekable, but if - <code><a href="#op_seek_func">seek()</a></code> is - implemented and succeeds on a particular source, then - <code><a href="#op_tell_func">tell()</a></code> must - also. - <code><a href="#op_close_func">close()</a></code> may - be <code>NULL</code>, but if it is not, it will be - called when the \c OggOpusFile is destroyed by - op_free(). - It will not be called if op_open_callbacks() fails - with an error. - \param _initial_data An initial buffer of data from the start of the - stream. - Applications can read some number of bytes from the - start of the stream to help identify this as an Opus - stream, and then provide them here to allow the - stream to be opened, even if it is unseekable. - \param _initial_bytes The number of bytes in \a _initial_data. - If the stream is seekable, its current position (as - reported by - <code><a href="#opus_tell_func">tell()</a></code> - at the start of this function) must be equal to - \a _initial_bytes. - Otherwise, seeking to absolute positions will - generate inconsistent results. - \param[out] _error Returns 0 on success, or a failure code on error. - You may pass in <code>NULL</code> if you don't want - the failure code. - The failure code will be one of - <dl> - <dt>#OP_EREAD</dt> - <dd>An underlying read, seek, or tell operation - failed when it should have succeeded, or we failed - to find data in the stream we had seen before.</dd> - <dt>#OP_EFAULT</dt> - <dd>There was a memory allocation failure, or an - internal library error.</dd> - <dt>#OP_EIMPL</dt> - <dd>The stream used a feature that is not - implemented, such as an unsupported channel - family.</dd> - <dt>#OP_EINVAL</dt> - <dd><code><a href="#op_seek_func">seek()</a></code> - was implemented and succeeded on this source, but - <code><a href="#op_tell_func">tell()</a></code> - did not, or the starting position indicator was - not equal to \a _initial_bytes.</dd> - <dt>#OP_ENOTFORMAT</dt> - <dd>The stream contained a link that did not have - any logical Opus streams in it.</dd> - <dt>#OP_EBADHEADER</dt> - <dd>A required header packet was not properly - formatted, contained illegal values, or was missing - altogether.</dd> - <dt>#OP_EVERSION</dt> - <dd>An ID header contained an unrecognized version - number.</dd> - <dt>#OP_EBADLINK</dt> - <dd>We failed to find data we had seen before after - seeking.</dd> - <dt>#OP_EBADTIMESTAMP</dt> - <dd>The first or last timestamp in a link failed - basic validity checks.</dd> - </dl> - \return A freshly opened \c OggOpusFile, or <code>NULL</code> on error. - <tt>libopusfile</tt> does <em>not</em> take ownership of the source - if the call fails. - The calling application is responsible for closing the source if - this call returns an error.*/ -OP_WARN_UNUSED_RESULT OggOpusFile *op_open_callbacks(void *_source, - const OpusFileCallbacks *_cb,const unsigned char *_initial_data, - size_t _initial_bytes,int *_error) OP_ARG_NONNULL(2); - -/**Partially open a stream from the given file path. - \see op_test_callbacks - \param _path The path to the file to open. - \param[out] _error Returns 0 on success, or a failure code on error. - You may pass in <code>NULL</code> if you don't want the - failure code. - The failure code will be #OP_EFAULT if the file could not - be opened, or one of the other failure codes from - op_open_callbacks() otherwise. - \return A partially opened \c OggOpusFile, or <code>NULL</code> on error.*/ -OP_WARN_UNUSED_RESULT OggOpusFile *op_test_file(const char *_path,int *_error) - OP_ARG_NONNULL(1); - -/**Partially open a stream from a memory buffer. - \see op_test_callbacks - \param _data The memory buffer to open. - \param _size The number of bytes in the buffer. - \param[out] _error Returns 0 on success, or a failure code on error. - You may pass in <code>NULL</code> if you don't want the - failure code. - See op_open_callbacks() for a full list of failure codes. - \return A partially opened \c OggOpusFile, or <code>NULL</code> on error.*/ -OP_WARN_UNUSED_RESULT OggOpusFile *op_test_memory(const unsigned char *_data, - size_t _size,int *_error); - -/**Partially open a stream from a URL. - This function behaves identically to op_test_url(), except that it - takes a va_list instead of a variable number of arguments. - It does not call the <code>va_end</code> macro, and because it invokes the - <code>va_arg</code> macro, the value of \a _ap is undefined after the call. - \note If you use this function, you must link against <tt>libopusurl</tt>. - \see op_test_url - \see op_test_callbacks - \param _url The URL to open. - Currently only the <file:>, <http:>, and <https:> - schemes are supported. - Both <http:> and <https:> may be disabled at compile - time, in which case opening such URLs will always - fail. - Currently this only supports URIs. - IRIs should be converted to UTF-8 and URL-escaped, - with internationalized domain names encoded in - punycode, before passing them to this function. - \param[out] _error Returns 0 on success, or a failure code on error. - You may pass in <code>NULL</code> if you don't want - the failure code. - See op_open_callbacks() for a full list of failure - codes. - \param[in,out] _ap A list of the \ref url_options "optional flags" to - use. - This is a variable-length list of options terminated - with <code>NULL</code>. - \return A partially opened \c OggOpusFile, or <code>NULL</code> on error.*/ -OP_WARN_UNUSED_RESULT OggOpusFile *op_vtest_url(const char *_url, - int *_error,va_list _ap) OP_ARG_NONNULL(1); - -/**Partially open a stream from a URL. - \note If you use this function, you must link against <tt>libopusurl</tt>. - \see op_test_callbacks - \param _url The URL to open. - Currently only the <file:>, <http:>, and <https:> - schemes are supported. - Both <http:> and <https:> may be disabled at compile - time, in which case opening such URLs will always fail. - Currently this only supports URIs. - IRIs should be converted to UTF-8 and URL-escaped, with - internationalized domain names encoded in punycode, - before passing them to this function. - \param[out] _error Returns 0 on success, or a failure code on error. - You may pass in <code>NULL</code> if you don't want the - failure code. - See op_open_callbacks() for a full list of failure - codes. - \param ... The \ref url_options "optional flags" to use. - This is a variable-length list of options terminated - with <code>NULL</code>. - \return A partially opened \c OggOpusFile, or <code>NULL</code> on error.*/ -OP_WARN_UNUSED_RESULT OggOpusFile *op_test_url(const char *_url, - int *_error,...) OP_ARG_NONNULL(1); - -/**Partially open a stream using the given set of callbacks to access it. - This tests for Opusness and loads the headers for the first link. - It does not seek (although it tests for seekability). - You can query a partially open stream for the few pieces of basic - information returned by op_serialno(), op_channel_count(), op_head(), and - op_tags() (but only for the first link). - You may also determine if it is seekable via a call to op_seekable(). - You cannot read audio from the stream, seek, get the size or duration, - get information from links other than the first one, or even get the total - number of links until you finish opening the stream with op_test_open(). - If you do not need to do any of these things, you can dispose of it with - op_free() instead. - - This function is provided mostly to simplify porting existing code that used - <tt>libvorbisfile</tt>. - For new code, you are likely better off using op_test() instead, which - is less resource-intensive, requires less data to succeed, and imposes a - hard limit on the amount of data it examines (important for unseekable - sources, where all such data must be buffered until you are sure of the - stream type). - \param _source The stream to read from (e.g., a <code>FILE *</code>). - \param _cb The callbacks with which to access the stream. - <code><a href="#op_read_func">read()</a></code> must - be implemented. - <code><a href="#op_seek_func">seek()</a></code> and - <code><a href="#op_tell_func">tell()</a></code> may - be <code>NULL</code>, or may always return -1 to - indicate a source is unseekable, but if - <code><a href="#op_seek_func">seek()</a></code> is - implemented and succeeds on a particular source, then - <code><a href="#op_tell_func">tell()</a></code> must - also. - <code><a href="#op_close_func">close()</a></code> may - be <code>NULL</code>, but if it is not, it will be - called when the \c OggOpusFile is destroyed by - op_free(). - It will not be called if op_open_callbacks() fails - with an error. - \param _initial_data An initial buffer of data from the start of the - stream. - Applications can read some number of bytes from the - start of the stream to help identify this as an Opus - stream, and then provide them here to allow the - stream to be tested more thoroughly, even if it is - unseekable. - \param _initial_bytes The number of bytes in \a _initial_data. - If the stream is seekable, its current position (as - reported by - <code><a href="#opus_tell_func">tell()</a></code> - at the start of this function) must be equal to - \a _initial_bytes. - Otherwise, seeking to absolute positions will - generate inconsistent results. - \param[out] _error Returns 0 on success, or a failure code on error. - You may pass in <code>NULL</code> if you don't want - the failure code. - See op_open_callbacks() for a full list of failure - codes. - \return A partially opened \c OggOpusFile, or <code>NULL</code> on error. - <tt>libopusfile</tt> does <em>not</em> take ownership of the source - if the call fails. - The calling application is responsible for closing the source if - this call returns an error.*/ -OP_WARN_UNUSED_RESULT OggOpusFile *op_test_callbacks(void *_source, - const OpusFileCallbacks *_cb,const unsigned char *_initial_data, - size_t _initial_bytes,int *_error) OP_ARG_NONNULL(2); - -/**Finish opening a stream partially opened with op_test_callbacks() or one of - the associated convenience functions. - If this function fails, you are still responsible for freeing the - \c OggOpusFile with op_free(). - \param _of The \c OggOpusFile to finish opening. - \return 0 on success, or a negative value on error. - \retval #OP_EREAD An underlying read, seek, or tell operation failed - when it should have succeeded. - \retval #OP_EFAULT There was a memory allocation failure, or an - internal library error. - \retval #OP_EIMPL The stream used a feature that is not implemented, - such as an unsupported channel family. - \retval #OP_EINVAL The stream was not partially opened with - op_test_callbacks() or one of the associated - convenience functions. - \retval #OP_ENOTFORMAT The stream contained a link that did not have any - logical Opus streams in it. - \retval #OP_EBADHEADER A required header packet was not properly - formatted, contained illegal values, or was - missing altogether. - \retval #OP_EVERSION An ID header contained an unrecognized version - number. - \retval #OP_EBADLINK We failed to find data we had seen before after - seeking. - \retval #OP_EBADTIMESTAMP The first or last timestamp in a link failed basic - validity checks.*/ -int op_test_open(OggOpusFile *_of) OP_ARG_NONNULL(1); - -/**Release all memory used by an \c OggOpusFile. - \param _of The \c OggOpusFile to free.*/ -void op_free(OggOpusFile *_of); - -/*@}*/ -/*@}*/ - -/**\defgroup stream_info Stream Information*/ -/*@{*/ -/**\name Functions for obtaining information about streams - - These functions allow you to get basic information about a stream, including - seekability, the number of links (for chained streams), plus the size, - duration, bitrate, header parameters, and meta information for each link - (or, where available, the stream as a whole). - Some of these (size, duration) are only available for seekable streams. - You can also query the current stream position, link, and playback time, - and instantaneous bitrate during playback. - - Some of these functions may be used successfully on the partially open - streams returned by op_test_callbacks() or one of the associated - convenience functions. - Their documention will indicate so explicitly.*/ -/*@{*/ - -/**Returns whether or not the data source being read is seekable. - This is true if - <ol> - <li>The <code><a href="#op_seek_func">seek()</a></code> and - <code><a href="#op_tell_func">tell()</a></code> callbacks are both - non-<code>NULL</code>,</li> - <li>The <code><a href="#op_seek_func">seek()</a></code> callback was - successfully executed at least once, and</li> - <li>The <code><a href="#op_tell_func">tell()</a></code> callback was - successfully able to report the position indicator afterwards.</li> - </ol> - This function may be called on partially-opened streams. - \param _of The \c OggOpusFile whose seekable status is to be returned. - \return A non-zero value if seekable, and 0 if unseekable.*/ -int op_seekable(const OggOpusFile *_of) OP_ARG_NONNULL(1); - -/**Returns the number of links in this chained stream. - This function may be called on partially-opened streams, but it will always - return 1. - The actual number of links is not known until the stream is fully opened. - \param _of The \c OggOpusFile from which to retrieve the link count. - \return For fully-open seekable sources, this returns the total number of - links in the whole stream, which will be at least 1. - For partially-open or unseekable sources, this always returns 1.*/ -int op_link_count(const OggOpusFile *_of) OP_ARG_NONNULL(1); - -/**Get the serial number of the given link in a (possibly-chained) Ogg Opus - stream. - This function may be called on partially-opened streams, but it will always - return the serial number of the Opus stream in the first link. - \param _of The \c OggOpusFile from which to retrieve the serial number. - \param _li The index of the link whose serial number should be retrieved. - Use a negative number to get the serial number of the current - link. - \return The serial number of the given link. - If \a _li is greater than the total number of links, this returns - the serial number of the last link. - If the source is not seekable, this always returns the serial number - of the current link.*/ -opus_uint32 op_serialno(const OggOpusFile *_of,int _li) OP_ARG_NONNULL(1); - -/**Get the channel count of the given link in a (possibly-chained) Ogg Opus - stream. - This is equivalent to <code>op_head(_of,_li)->channel_count</code>, but - is provided for convenience. - This function may be called on partially-opened streams, but it will always - return the channel count of the Opus stream in the first link. - \param _of The \c OggOpusFile from which to retrieve the channel count. - \param _li The index of the link whose channel count should be retrieved. - Use a negative number to get the channel count of the current - link. - \return The channel count of the given link. - If \a _li is greater than the total number of links, this returns - the channel count of the last link. - If the source is not seekable, this always returns the channel count - of the current link.*/ -int op_channel_count(const OggOpusFile *_of,int _li) OP_ARG_NONNULL(1); - -/**Get the total (compressed) size of the stream, or of an individual link in - a (possibly-chained) Ogg Opus stream, including all headers and Ogg muxing - overhead. - \param _of The \c OggOpusFile from which to retrieve the compressed size. - \param _li The index of the link whose compressed size should be computed. - Use a negative number to get the compressed size of the entire - stream. - \return The compressed size of the entire stream if \a _li is negative, the - compressed size of link \a _li if it is non-negative, or a negative - value on error. - The compressed size of the entire stream may be smaller than that - of the underlying source if trailing garbage was detected in the - file. - \retval #OP_EINVAL The source is not seekable (so we can't know the length), - \a _li wasn't less than the total number of links in - the stream, or the stream was only partially open.*/ -opus_int64 op_raw_total(const OggOpusFile *_of,int _li) OP_ARG_NONNULL(1); - -/**Get the total PCM length (number of samples at 48 kHz) of the stream, or of - an individual link in a (possibly-chained) Ogg Opus stream. - Users looking for <code>op_time_total()</code> should use op_pcm_total() - instead. - Because timestamps in Opus are fixed at 48 kHz, there is no need for a - separate function to convert this to seconds (and leaving it out avoids - introducing floating point to the API, for those that wish to avoid it). - \param _of The \c OggOpusFile from which to retrieve the PCM offset. - \param _li The index of the link whose PCM length should be computed. - Use a negative number to get the PCM length of the entire stream. - \return The PCM length of the entire stream if \a _li is negative, the PCM - length of link \a _li if it is non-negative, or a negative value on - error. - \retval #OP_EINVAL The source is not seekable (so we can't know the length), - \a _li wasn't less than the total number of links in - the stream, or the stream was only partially open.*/ -ogg_int64_t op_pcm_total(const OggOpusFile *_of,int _li) OP_ARG_NONNULL(1); - -/**Get the ID header information for the given link in a (possibly chained) Ogg - Opus stream. - This function may be called on partially-opened streams, but it will always - return the ID header information of the Opus stream in the first link. - \param _of The \c OggOpusFile from which to retrieve the ID header - information. - \param _li The index of the link whose ID header information should be - retrieved. - Use a negative number to get the ID header information of the - current link. - For an unseekable stream, \a _li is ignored, and the ID header - information for the current link is always returned, if - available. - \return The contents of the ID header for the given link.*/ -const OpusHead *op_head(const OggOpusFile *_of,int _li) OP_ARG_NONNULL(1); - -/**Get the comment header information for the given link in a (possibly - chained) Ogg Opus stream. - This function may be called on partially-opened streams, but it will always - return the tags from the Opus stream in the first link. - \param _of The \c OggOpusFile from which to retrieve the comment header - information. - \param _li The index of the link whose comment header information should be - retrieved. - Use a negative number to get the comment header information of - the current link. - For an unseekable stream, \a _li is ignored, and the comment - header information for the current link is always returned, if - available. - \return The contents of the comment header for the given link, or - <code>NULL</code> if this is an unseekable stream that encountered - an invalid link.*/ -const OpusTags *op_tags(const OggOpusFile *_of,int _li) OP_ARG_NONNULL(1); - -/**Retrieve the index of the current link. - This is the link that produced the data most recently read by - op_read_float() or its associated functions, or, after a seek, the link - that the seek target landed in. - Reading more data may advance the link index (even on the first read after a - seek). - \param _of The \c OggOpusFile from which to retrieve the current link index. - \return The index of the current link on success, or a negative value on - failure. - For seekable streams, this is a number between 0 and the value - returned by op_link_count(). - For unseekable streams, this value starts at 0 and increments by one - each time a new link is encountered (even though op_link_count() - always returns 1). - \retval #OP_EINVAL The stream was only partially open.*/ -int op_current_link(const OggOpusFile *_of) OP_ARG_NONNULL(1); - -/**Computes the bitrate for a given link in a (possibly chained) Ogg Opus - stream. - The stream must be seekable to compute the bitrate. - For unseekable streams, use op_bitrate_instant() to get periodic estimates. - \param _of The \c OggOpusFile from which to retrieve the bitrate. - \param _li The index of the link whose bitrate should be computed. - USe a negative number to get the bitrate of the whole stream. - \return The bitrate on success, or a negative value on error. - \retval #OP_EINVAL The stream was only partially open, the stream was not - seekable, or \a _li was larger than the number of - links.*/ -opus_int32 op_bitrate(const OggOpusFile *_of,int _li) OP_ARG_NONNULL(1); - -/**Compute the instantaneous bitrate, measured as the ratio of bits to playable - samples decoded since a) the last call to op_bitrate_instant(), b) the last - seek, or c) the start of playback, whichever was most recent. - This will spike somewhat after a seek or at the start/end of a chain - boundary, as pre-skip, pre-roll, and end-trimming causes samples to be - decoded but not played. - \param _of The \c OggOpusFile from which to retrieve the bitrate. - \return The bitrate, in bits per second, or a negative value on error. - \retval #OP_FALSE No data has been decoded since any of the events - described above. - \retval #OP_EINVAL The stream was only partially open.*/ -opus_int32 op_bitrate_instant(OggOpusFile *_of) OP_ARG_NONNULL(1); - -/**Obtain the current value of the position indicator for \a _of. - \param _of The \c OggOpusFile from which to retrieve the position indicator. - \return The byte position that is currently being read from. - \retval #OP_EINVAL The stream was only partially open.*/ -opus_int64 op_raw_tell(const OggOpusFile *_of) OP_ARG_NONNULL(1); - -/**Obtain the PCM offset of the next sample to be read. - If the stream is not properly timestamped, this might not increment by the - proper amount between reads, or even return monotonically increasing - values. - \param _of The \c OggOpusFile from which to retrieve the PCM offset. - \return The PCM offset of the next sample to be read. - \retval #OP_EINVAL The stream was only partially open.*/ -ogg_int64_t op_pcm_tell(const OggOpusFile *_of) OP_ARG_NONNULL(1); - -/*@}*/ -/*@}*/ - -/**\defgroup stream_seeking Seeking*/ -/*@{*/ -/**\name Functions for seeking in Opus streams - - These functions let you seek in Opus streams, if the underlying source - support it. - Seeking is implemented for all built-in stream I/O routines, though some - individual sources may not be seekable (pipes, live HTTP streams, or HTTP - streams from a server that does not support <code>Range</code> requests). - - op_raw_seek() is the fastest: it is guaranteed to perform at most one - physical seek, but, since the target is a byte position, makes no guarantee - how close to a given time it will come. - op_pcm_seek() provides sample-accurate seeking. - The number of physical seeks it requires is still quite small (often 1 or - 2, even in highly variable bitrate streams). - - Seeking in Opus requires decoding some pre-roll amount before playback to - allow the internal state to converge (as if recovering from packet loss). - This is handled internally by <tt>libopusfile</tt>, but means there is - little extra overhead for decoding up to the exact position requested - (since it must decode some amount of audio anyway). - It also means that decoding after seeking may not return exactly the same - values as would be obtained by decoding the stream straight through. - However, such differences are expected to be smaller than the loss - introduced by Opus's lossy compression.*/ -/*@{*/ - -/**Seek to a byte offset relative to the <b>compressed</b> data. - This also scans packets to update the PCM cursor. - It will cross a logical bitstream boundary, but only if it can't get any - packets out of the tail of the link to which it seeks. - \param _of The \c OggOpusFile in which to seek. - \param _byte_offset The byte position to seek to. - \return 0 on success, or a negative error code on failure. - \retval #OP_EREAD The underlying seek operation failed. - \retval #OP_EINVAL The stream was only partially open, or the target was - outside the valid range for the stream. - \retval #OP_ENOSEEK This stream is not seekable. - \retval #OP_EBADLINK Failed to initialize a decoder for a stream for an - unknown reason.*/ -int op_raw_seek(OggOpusFile *_of,opus_int64 _byte_offset) OP_ARG_NONNULL(1); - -/**Seek to the specified PCM offset, such that decoding will begin at exactly - the requested position. - \param _of The \c OggOpusFile in which to seek. - \param _pcm_offset The PCM offset to seek to. - This is in samples at 48 kHz relative to the start of the - stream. - \return 0 on success, or a negative value on error. - \retval #OP_EREAD An underlying read or seek operation failed. - \retval #OP_EINVAL The stream was only partially open, or the target was - outside the valid range for the stream. - \retval #OP_ENOSEEK This stream is not seekable. - \retval #OP_EBADLINK We failed to find data we had seen before, or the - bitstream structure was sufficiently malformed that - seeking to the target destination was impossible.*/ -int op_pcm_seek(OggOpusFile *_of,ogg_int64_t _pcm_offset) OP_ARG_NONNULL(1); - -/*@}*/ -/*@}*/ - -/**\defgroup stream_decoding Decoding*/ -/*@{*/ -/**\name Functions for decoding audio data - - These functions retrieve actual decoded audio data from the stream. - The general functions, op_read() and op_read_float() return 16-bit or - floating-point output, both using native endian ordering. - The number of channels returned can change from link to link in a chained - stream. - There are special functions, op_read_stereo() and op_read_float_stereo(), - which always output two channels, to simplify applications which do not - wish to handle multichannel audio. - These downmix multichannel files to two channels, so they can always return - samples in the same format for every link in a chained file. - - If the rest of your audio processing chain can handle floating point, those - routines should be preferred, as floating point output avoids introducing - clipping and other issues which might be avoided entirely if, e.g., you - scale down the volume at some other stage. - However, if you intend to direct consume 16-bit samples, the conversion in - <tt>libopusfile</tt> provides noise-shaping dithering and, if compiled - against <tt>libopus</tt> 1.1 or later, soft-clipping prevention. - - <tt>libopusfile</tt> can also be configured at compile time to use the - fixed-point <tt>libopus</tt> API. - If so, <tt>libopusfile</tt>'s floating-point API may also be disabled. - In that configuration, nothing in <tt>libopusfile</tt> will use any - floating-point operations, to simplify support on devices without an - adequate FPU. - - \warning HTTPS streams may be be vulnerable to truncation attacks if you do - not check the error return code from op_read_float() or its associated - functions. - If the remote peer does not close the connection gracefully (with a TLS - "close notify" message), these functions will return #OP_EREAD instead of 0 - when they reach the end of the file. - If you are reading from an <https:> URL (particularly if seeking is not - supported), you should make sure to check for this error and warn the user - appropriately.*/ -/*@{*/ - -/**Indicates that the decoding callback should produce signed 16-bit - native-endian output samples.*/ -#define OP_DEC_FORMAT_SHORT (7008) -/**Indicates that the decoding callback should produce 32-bit native-endian - float samples.*/ -#define OP_DEC_FORMAT_FLOAT (7040) - -/**Indicates that the decoding callback did not decode anything, and that - <tt>libopusfile</tt> should decode normally instead.*/ -#define OP_DEC_USE_DEFAULT (6720) - -/**Called to decode an Opus packet. - This should invoke the functional equivalent of opus_multistream_decode() or - opus_multistream_decode_float(), except that it returns 0 on success - instead of the number of decoded samples (which is known a priori). - \param _ctx The application-provided callback context. - \param _decoder The decoder to use to decode the packet. - \param[out] _pcm The buffer to decode into. - This will always have enough room for \a _nchannels of - \a _nsamples samples, which should be placed into this - buffer interleaved. - \param _op The packet to decode. - This will always have its granule position set to a valid - value. - \param _nsamples The number of samples expected from the packet. - \param _nchannels The number of channels expected from the packet. - \param _format The desired sample output format. - This is either #OP_DEC_FORMAT_SHORT or - #OP_DEC_FORMAT_FLOAT. - \param _li The index of the link from which this packet was decoded. - \return A non-negative value on success, or a negative value on error. - The error codes should be the same as those returned by - opus_multistream_decode() or opus_multistream_decode_float(). - \retval 0 Decoding was successful. - The application has filled the buffer with - exactly <code>\a _nsamples*\a - _nchannels</code> samples in the requested - format. - \retval #OP_DEC_USE_DEFAULT No decoding was done. - <tt>libopusfile</tt> should decode normally - instead.*/ -typedef int (*op_decode_cb_func)(void *_ctx,OpusMSDecoder *_decoder,void *_pcm, - const ogg_packet *_op,int _nsamples,int _nchannels,int _format,int _li); - -/**Sets the packet decode callback function. - This is called once for each packet that needs to be decoded. - A call to this function is no guarantee that the audio will eventually be - delivered to the application. - Some or all of the data from the packet may be discarded (i.e., at the - beginning or end of a link, or after a seek), however the callback is - required to provide all of it. - \param _of The \c OggOpusFile on which to set the decode callback. - \param _decode_cb The callback function to call. - This may be <code>NULL</code> to disable calling the - callback. - \param _ctx The application-provided context pointer to pass to the - callback on each call.*/ -void op_set_decode_callback(OggOpusFile *_of, - op_decode_cb_func _decode_cb,void *_ctx) OP_ARG_NONNULL(1); - -/**Gain offset type that indicates that the provided offset is relative to the - header gain. - This is the default.*/ -#define OP_HEADER_GAIN (0) - -/**Gain offset type that indicates that the provided offset is relative to the - R128_TRACK_GAIN value (if any), in addition to the header gain.*/ -#define OP_TRACK_GAIN (3008) - -/**Gain offset type that indicates that the provided offset should be used as - the gain directly, without applying any the header or track gains.*/ -#define OP_ABSOLUTE_GAIN (3009) - -/**Sets the gain to be used for decoded output. - By default, the gain in the header is applied with no additional offset. - The total gain (including header gain and/or track gain, if applicable, and - this offset), will be clamped to [-32768,32767]/256 dB. - This is more than enough to saturate or underflow 16-bit PCM. - \note The new gain will not be applied to any already buffered, decoded - output. - This means you cannot change it sample-by-sample, as at best it will be - updated packet-by-packet. - It is meant for setting a target volume level, rather than applying smooth - fades, etc. - \param _of The \c OggOpusFile on which to set the gain offset. - \param _gain_type One of #OP_HEADER_GAIN, #OP_TRACK_GAIN, or - #OP_ABSOLUTE_GAIN. - \param _gain_offset_q8 The gain offset to apply, in 1/256ths of a dB. - \return 0 on success or a negative value on error. - \retval #OP_EINVAL The \a _gain_type was unrecognized.*/ -int op_set_gain_offset(OggOpusFile *_of, - int _gain_type,opus_int32 _gain_offset_q8) OP_ARG_NONNULL(1); - -/**Sets whether or not dithering is enabled for 16-bit decoding. - By default, when <tt>libopusfile</tt> is compiled to use floating-point - internally, calling op_read() or op_read_stereo() will first decode to - float, and then convert to fixed-point using noise-shaping dithering. - This flag can be used to disable that dithering. - When the application uses op_read_float() or op_read_float_stereo(), or when - the library has been compiled to decode directly to fixed point, this flag - has no effect. - \param _of The \c OggOpusFile on which to enable or disable dithering. - \param _enabled A non-zero value to enable dithering, or 0 to disable it.*/ -void op_set_dither_enabled(OggOpusFile *_of,int _enabled) OP_ARG_NONNULL(1); - -/**Reads more samples from the stream. - \note Although \a _buf_size must indicate the total number of values that - can be stored in \a _pcm, the return value is the number of samples - <em>per channel</em>. - This is done because - <ol> - <li>The channel count cannot be known a priori (reading more samples might - advance us into the next link, with a different channel count), so - \a _buf_size cannot also be in units of samples per channel,</li> - <li>Returning the samples per channel matches the <code>libopus</code> API - as closely as we're able,</li> - <li>Returning the total number of values instead of samples per channel - would mean the caller would need a division to compute the samples per - channel, and might worry about the possibility of getting back samples - for some channels and not others, and</li> - <li>This approach is relatively fool-proof: if an application passes too - small a value to \a _buf_size, they will simply get fewer samples back, - and if they assume the return value is the total number of values, then - they will simply read too few (rather than reading too many and going - off the end of the buffer).</li> - </ol> - \param _of The \c OggOpusFile from which to read. - \param[out] _pcm A buffer in which to store the output PCM samples, as - signed native-endian 16-bit values at 48 kHz - with a nominal range of <code>[-32768,32767)</code>. - Multiple channels are interleaved using the - <a href="http://www.xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-800004.3.9">Vorbis - channel ordering</a>. - This must have room for at least \a _buf_size values. - \param _buf_size The number of values that can be stored in \a _pcm. - It is recommended that this be large enough for at - least 120 ms of data at 48 kHz per channel (5760 - values per channel). - Smaller buffers will simply return less data, possibly - consuming more memory to buffer the data internally. - <tt>libopusfile</tt> may return less data than - requested. - If so, there is no guarantee that the remaining data - in \a _pcm will be unmodified. - \param[out] _li The index of the link this data was decoded from. - You may pass <code>NULL</code> if you do not need this - information. - If this function fails (returning a negative value), - this parameter is left unset. - \return The number of samples read per channel on success, or a negative - value on failure. - The channel count can be retrieved on success by calling - <code>op_head(_of,*_li)</code>. - The number of samples returned may be 0 if the buffer was too small - to store even a single sample for all channels, or if end-of-file - was reached. - The list of possible failure codes follows. - Most of them can only be returned by unseekable, chained streams - that encounter a new link. - \retval #OP_HOLE There was a hole in the data, and some samples - may have been skipped. - Call this function again to continue decoding - past the hole. - \retval #OP_EREAD An underlying read operation failed. - This may signal a truncation attack from an - <https:> source. - \retval #OP_EFAULT An internal memory allocation failed. - \retval #OP_EIMPL An unseekable stream encountered a new link that - used a feature that is not implemented, such as - an unsupported channel family. - \retval #OP_EINVAL The stream was only partially open. - \retval #OP_ENOTFORMAT An unseekable stream encountered a new link that - did not have any logical Opus streams in it. - \retval #OP_EBADHEADER An unseekable stream encountered a new link with a - required header packet that was not properly - formatted, contained illegal values, or was - missing altogether. - \retval #OP_EVERSION An unseekable stream encountered a new link with - an ID header that contained an unrecognized - version number. - \retval #OP_EBADPACKET Failed to properly decode the next packet. - \retval #OP_EBADLINK We failed to find data we had seen before. - \retval #OP_EBADTIMESTAMP An unseekable stream encountered a new link with - a starting timestamp that failed basic validity - checks.*/ -OP_WARN_UNUSED_RESULT int op_read(OggOpusFile *_of, - opus_int16 *_pcm,int _buf_size,int *_li) OP_ARG_NONNULL(1); - -/**Reads more samples from the stream. - \note Although \a _buf_size must indicate the total number of values that - can be stored in \a _pcm, the return value is the number of samples - <em>per channel</em>. - <ol> - <li>The channel count cannot be known a priori (reading more samples might - advance us into the next link, with a different channel count), so - \a _buf_size cannot also be in units of samples per channel,</li> - <li>Returning the samples per channel matches the <code>libopus</code> API - as closely as we're able,</li> - <li>Returning the total number of values instead of samples per channel - would mean the caller would need a division to compute the samples per - channel, and might worry about the possibility of getting back samples - for some channels and not others, and</li> - <li>This approach is relatively fool-proof: if an application passes too - small a value to \a _buf_size, they will simply get fewer samples back, - and if they assume the return value is the total number of values, then - they will simply read too few (rather than reading too many and going - off the end of the buffer).</li> - </ol> - \param _of The \c OggOpusFile from which to read. - \param[out] _pcm A buffer in which to store the output PCM samples as - signed floats at 48 kHz with a nominal range of - <code>[-1.0,1.0]</code>. - Multiple channels are interleaved using the - <a href="http://www.xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-800004.3.9">Vorbis - channel ordering</a>. - This must have room for at least \a _buf_size floats. - \param _buf_size The number of floats that can be stored in \a _pcm. - It is recommended that this be large enough for at - least 120 ms of data at 48 kHz per channel (5760 - samples per channel). - Smaller buffers will simply return less data, possibly - consuming more memory to buffer the data internally. - If less than \a _buf_size values are returned, - <tt>libopusfile</tt> makes no guarantee that the - remaining data in \a _pcm will be unmodified. - \param[out] _li The index of the link this data was decoded from. - You may pass <code>NULL</code> if you do not need this - information. - If this function fails (returning a negative value), - this parameter is left unset. - \return The number of samples read per channel on success, or a negative - value on failure. - The channel count can be retrieved on success by calling - <code>op_head(_of,*_li)</code>. - The number of samples returned may be 0 if the buffer was too small - to store even a single sample for all channels, or if end-of-file - was reached. - The list of possible failure codes follows. - Most of them can only be returned by unseekable, chained streams - that encounter a new link. - \retval #OP_HOLE There was a hole in the data, and some samples - may have been skipped. - Call this function again to continue decoding - past the hole. - \retval #OP_EREAD An underlying read operation failed. - This may signal a truncation attack from an - <https:> source. - \retval #OP_EFAULT An internal memory allocation failed. - \retval #OP_EIMPL An unseekable stream encountered a new link that - used a feature that is not implemented, such as - an unsupported channel family. - \retval #OP_EINVAL The stream was only partially open. - \retval #OP_ENOTFORMAT An unseekable stream encountered a new link that - did not have any logical Opus streams in it. - \retval #OP_EBADHEADER An unseekable stream encountered a new link with a - required header packet that was not properly - formatted, contained illegal values, or was - missing altogether. - \retval #OP_EVERSION An unseekable stream encountered a new link with - an ID header that contained an unrecognized - version number. - \retval #OP_EBADPACKET Failed to properly decode the next packet. - \retval #OP_EBADLINK We failed to find data we had seen before. - \retval #OP_EBADTIMESTAMP An unseekable stream encountered a new link with - a starting timestamp that failed basic validity - checks.*/ -OP_WARN_UNUSED_RESULT int op_read_float(OggOpusFile *_of, - float *_pcm,int _buf_size,int *_li) OP_ARG_NONNULL(1); - -/**Reads more samples from the stream and downmixes to stereo, if necessary. - This function is intended for simple players that want a uniform output - format, even if the channel count changes between links in a chained - stream. - \note \a _buf_size indicates the total number of values that can be stored - in \a _pcm, while the return value is the number of samples <em>per - channel</em>, even though the channel count is known, for consistency with - op_read(). - \param _of The \c OggOpusFile from which to read. - \param[out] _pcm A buffer in which to store the output PCM samples, as - signed native-endian 16-bit values at 48 kHz - with a nominal range of <code>[-32768,32767)</code>. - The left and right channels are interleaved in the - buffer. - This must have room for at least \a _buf_size values. - \param _buf_size The number of values that can be stored in \a _pcm. - It is recommended that this be large enough for at - least 120 ms of data at 48 kHz per channel (11520 - values total). - Smaller buffers will simply return less data, possibly - consuming more memory to buffer the data internally. - If less than \a _buf_size values are returned, - <tt>libopusfile</tt> makes no guarantee that the - remaining data in \a _pcm will be unmodified. - \return The number of samples read per channel on success, or a negative - value on failure. - The number of samples returned may be 0 if the buffer was too small - to store even a single sample for both channels, or if end-of-file - was reached. - The list of possible failure codes follows. - Most of them can only be returned by unseekable, chained streams - that encounter a new link. - \retval #OP_HOLE There was a hole in the data, and some samples - may have been skipped. - Call this function again to continue decoding - past the hole. - \retval #OP_EREAD An underlying read operation failed. - This may signal a truncation attack from an - <https:> source. - \retval #OP_EFAULT An internal memory allocation failed. - \retval #OP_EIMPL An unseekable stream encountered a new link that - used a feature that is not implemented, such as - an unsupported channel family. - \retval #OP_EINVAL The stream was only partially open. - \retval #OP_ENOTFORMAT An unseekable stream encountered a new link that - did not have any logical Opus streams in it. - \retval #OP_EBADHEADER An unseekable stream encountered a new link with a - required header packet that was not properly - formatted, contained illegal values, or was - missing altogether. - \retval #OP_EVERSION An unseekable stream encountered a new link with - an ID header that contained an unrecognized - version number. - \retval #OP_EBADPACKET Failed to properly decode the next packet. - \retval #OP_EBADLINK We failed to find data we had seen before. - \retval #OP_EBADTIMESTAMP An unseekable stream encountered a new link with - a starting timestamp that failed basic validity - checks.*/ -OP_WARN_UNUSED_RESULT int op_read_stereo(OggOpusFile *_of, - opus_int16 *_pcm,int _buf_size) OP_ARG_NONNULL(1); - -/**Reads more samples from the stream and downmixes to stereo, if necessary. - This function is intended for simple players that want a uniform output - format, even if the channel count changes between links in a chained - stream. - \note \a _buf_size indicates the total number of values that can be stored - in \a _pcm, while the return value is the number of samples <em>per - channel</em>, even though the channel count is known, for consistency with - op_read_float(). - \param _of The \c OggOpusFile from which to read. - \param[out] _pcm A buffer in which to store the output PCM samples, as - signed floats at 48 kHz with a nominal range of - <code>[-1.0,1.0]</code>. - The left and right channels are interleaved in the - buffer. - This must have room for at least \a _buf_size values. - \param _buf_size The number of values that can be stored in \a _pcm. - It is recommended that this be large enough for at - least 120 ms of data at 48 kHz per channel (11520 - values total). - Smaller buffers will simply return less data, possibly - consuming more memory to buffer the data internally. - If less than \a _buf_size values are returned, - <tt>libopusfile</tt> makes no guarantee that the - remaining data in \a _pcm will be unmodified. - \return The number of samples read per channel on success, or a negative - value on failure. - The number of samples returned may be 0 if the buffer was too small - to store even a single sample for both channels, or if end-of-file - was reached. - The list of possible failure codes follows. - Most of them can only be returned by unseekable, chained streams - that encounter a new link. - \retval #OP_HOLE There was a hole in the data, and some samples - may have been skipped. - Call this function again to continue decoding - past the hole. - \retval #OP_EREAD An underlying read operation failed. - This may signal a truncation attack from an - <https:> source. - \retval #OP_EFAULT An internal memory allocation failed. - \retval #OP_EIMPL An unseekable stream encountered a new link that - used a feature that is not implemented, such as - an unsupported channel family. - \retval #OP_EINVAL The stream was only partially open. - \retval #OP_ENOTFORMAT An unseekable stream encountered a new link that - that did not have any logical Opus streams in it. - \retval #OP_EBADHEADER An unseekable stream encountered a new link with a - required header packet that was not properly - formatted, contained illegal values, or was - missing altogether. - \retval #OP_EVERSION An unseekable stream encountered a new link with - an ID header that contained an unrecognized - version number. - \retval #OP_EBADPACKET Failed to properly decode the next packet. - \retval #OP_EBADLINK We failed to find data we had seen before. - \retval #OP_EBADTIMESTAMP An unseekable stream encountered a new link with - a starting timestamp that failed basic validity - checks.*/ -OP_WARN_UNUSED_RESULT int op_read_float_stereo(OggOpusFile *_of, - float *_pcm,int _buf_size) OP_ARG_NONNULL(1); - -/*@}*/ -/*@}*/ - -# if OP_GNUC_PREREQ(4,0) -# pragma GCC visibility pop -# endif - -# if defined(__cplusplus) -} -# endif - -#endif |