diff options
Diffstat (limited to 'src/libspeex/speex_header.c')
| -rw-r--r-- | src/libspeex/speex_header.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/src/libspeex/speex_header.c b/src/libspeex/speex_header.c new file mode 100644 index 00000000..e9dd2286 --- /dev/null +++ b/src/libspeex/speex_header.c @@ -0,0 +1,188 @@ +/* Copyright (C) 2002 Jean-Marc Valin + File: speex_header.c + Describes the Speex header + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + + - Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + + - Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. + + - Neither the name of the Xiph.org Foundation nor the names of its + contributors may be used to endorse or promote products derived from + this software without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR + CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF + LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +*/ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include "arch.h" +#include <speex/speex_header.h> +#include <speex/speex.h> +#include "os_support.h" + +#ifndef NULL +#define NULL 0 +#endif + +/** Convert little endian */ +static inline spx_int32_t le_int(spx_int32_t i) +{ +#if !defined(__LITTLE_ENDIAN__) && ( defined(WORDS_BIGENDIAN) || defined(__BIG_ENDIAN__) ) + spx_uint32_t ui, ret; + ui = i; + ret = ui>>24; + ret |= (ui>>8)&0x0000ff00; + ret |= (ui<<8)&0x00ff0000; + ret |= (ui<<24); + return ret; +#else + return i; +#endif +} + +#define ENDIAN_SWITCH(x) {x=le_int(x);} + + +/* +typedef struct SpeexHeader { + char speex_string[8]; + char speex_version[SPEEX_HEADER_VERSION_LENGTH]; + int speex_version_id; + int header_size; + int rate; + int mode; + int mode_bitstream_version; + int nb_channels; + int bitrate; + int frame_size; + int vbr; + int frames_per_packet; + int extra_headers; + int reserved1; + int reserved2; +} SpeexHeader; +*/ + +void speex_init_header(SpeexHeader *header, int rate, int nb_channels, const SpeexMode *m) +{ + int i; + const char *h="Speex "; + /* + strncpy(header->speex_string, "Speex ", 8); + strncpy(header->speex_version, SPEEX_VERSION, SPEEX_HEADER_VERSION_LENGTH-1); + header->speex_version[SPEEX_HEADER_VERSION_LENGTH-1]=0; + */ + for (i=0;i<8;i++) + header->speex_string[i]=h[i]; + for (i=0;i<SPEEX_HEADER_VERSION_LENGTH-1 && SPEEX_VERSION[i];i++) + header->speex_version[i]=SPEEX_VERSION[i]; + for (;i<SPEEX_HEADER_VERSION_LENGTH;i++) + header->speex_version[i]=0; + + header->speex_version_id = 1; + header->header_size = sizeof(SpeexHeader); + + header->rate = rate; + header->mode = m->modeID; + header->mode_bitstream_version = m->bitstream_version; + if (m->modeID<0) + speex_warning("This mode is meant to be used alone"); + header->nb_channels = nb_channels; + header->bitrate = -1; + speex_mode_query(m, SPEEX_MODE_FRAME_SIZE, &header->frame_size); + header->vbr = 0; + + header->frames_per_packet = 0; + header->extra_headers = 0; + header->reserved1 = 0; + header->reserved2 = 0; +} + +char *speex_header_to_packet(SpeexHeader *header, int *size) +{ + SpeexHeader *le_header; + le_header = (SpeexHeader*)speex_alloc(sizeof(SpeexHeader)); + + SPEEX_COPY(le_header, header, 1); + + /*Make sure everything is now little-endian*/ + ENDIAN_SWITCH(le_header->speex_version_id); + ENDIAN_SWITCH(le_header->header_size); + ENDIAN_SWITCH(le_header->rate); + ENDIAN_SWITCH(le_header->mode); + ENDIAN_SWITCH(le_header->mode_bitstream_version); + ENDIAN_SWITCH(le_header->nb_channels); + ENDIAN_SWITCH(le_header->bitrate); + ENDIAN_SWITCH(le_header->frame_size); + ENDIAN_SWITCH(le_header->vbr); + ENDIAN_SWITCH(le_header->frames_per_packet); + ENDIAN_SWITCH(le_header->extra_headers); + + *size = sizeof(SpeexHeader); + return (char *)le_header; +} + +SpeexHeader *speex_packet_to_header(char *packet, int size) +{ + int i; + SpeexHeader *le_header; + const char *h = "Speex "; + for (i=0;i<8;i++) + if (packet[i]!=h[i]) + { + speex_notify("This doesn't look like a Speex file"); + return NULL; + } + + /*FIXME: Do we allow larger headers?*/ + if (size < (int)sizeof(SpeexHeader)) + { + speex_notify("Speex header too small"); + return NULL; + } + + le_header = (SpeexHeader*)speex_alloc(sizeof(SpeexHeader)); + + SPEEX_COPY(le_header, (SpeexHeader*)packet, 1); + + /*Make sure everything is converted correctly from little-endian*/ + ENDIAN_SWITCH(le_header->speex_version_id); + ENDIAN_SWITCH(le_header->header_size); + ENDIAN_SWITCH(le_header->rate); + ENDIAN_SWITCH(le_header->mode); + ENDIAN_SWITCH(le_header->mode_bitstream_version); + ENDIAN_SWITCH(le_header->nb_channels); + ENDIAN_SWITCH(le_header->bitrate); + ENDIAN_SWITCH(le_header->frame_size); + ENDIAN_SWITCH(le_header->vbr); + ENDIAN_SWITCH(le_header->frames_per_packet); + ENDIAN_SWITCH(le_header->extra_headers); + + return le_header; + +} + +void speex_header_free(void *ptr) +{ + speex_free(ptr); +} |