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Diffstat (limited to 'src/opusfile-0.2/src/info.c')
-rw-r--r--src/opusfile-0.2/src/info.c286
1 files changed, 286 insertions, 0 deletions
diff --git a/src/opusfile-0.2/src/info.c b/src/opusfile-0.2/src/info.c
new file mode 100644
index 00000000..62edecdb
--- /dev/null
+++ b/src/opusfile-0.2/src/info.c
@@ -0,0 +1,286 @@
+/********************************************************************
+ * *
+ * 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 2012 *
+ * by the Xiph.Org Foundation and contributors http://www.xiph.org/ *
+ * *
+ ********************************************************************/
+#include "internal.h"
+#include <limits.h>
+#include <string.h>
+
+static unsigned op_parse_uint16le(const unsigned char *_data){
+ return _data[0]|_data[1]<<8;
+}
+
+static int op_parse_int16le(const unsigned char *_data){
+ int ret;
+ ret=_data[0]|_data[1]<<8;
+ return (ret^0x8000)-0x8000;
+}
+
+static opus_uint32 op_parse_uint32le(const unsigned char *_data){
+ return _data[0]|_data[1]<<8|_data[2]<<16|_data[3]<<24;
+}
+
+int opus_head_parse(OpusHead *_head,const unsigned char *_data,size_t _len){
+ OpusHead head;
+ if(_len<8)return OP_ENOTFORMAT;
+ if(memcmp(_data,"OpusHead",8)!=0)return OP_ENOTFORMAT;
+ if(_len<9)return OP_EBADHEADER;
+ head.version=_data[8];
+ if(head.version>15)return OP_EVERSION;
+ if(_len<19)return OP_EBADHEADER;
+ head.channel_count=_data[9];
+ head.pre_skip=op_parse_uint16le(_data+10);
+ head.input_sample_rate=op_parse_uint32le(_data+12);
+ head.output_gain=op_parse_int16le(_data+16);
+ head.mapping_family=_data[18];
+ if(head.mapping_family==0){
+ if(head.channel_count<1||head.channel_count>2)return OP_EBADHEADER;
+ if(head.version<=1&&_len>19)return OP_EBADHEADER;
+ head.stream_count=1;
+ head.coupled_count=head.channel_count-1;
+ if(_head!=NULL){
+ _head->mapping[0]=0;
+ _head->mapping[1]=1;
+ }
+ }
+ else if(head.mapping_family==1){
+ size_t size;
+ int ci;
+ if(head.channel_count<1||head.channel_count>8)return OP_EBADHEADER;
+ size=21+head.channel_count;
+ if(_len<size||head.version<=1&&_len>size)return OP_EBADHEADER;
+ head.stream_count=_data[19];
+ if(head.stream_count<1)return OP_EBADHEADER;
+ head.coupled_count=_data[20];
+ if(head.coupled_count>head.stream_count)return OP_EBADHEADER;
+ for(ci=0;ci<head.channel_count;ci++){
+ if(_data[21+ci]>=head.stream_count+head.coupled_count
+ &&_data[21+ci]!=255){
+ return OP_EBADHEADER;
+ }
+ }
+ if(_head!=NULL)memcpy(_head->mapping,_data+21,head.channel_count);
+ }
+ /*General purpose players should not attempt to play back content with
+ channel mapping family 255.*/
+ else if(head.mapping_family==255)return OP_EIMPL;
+ /*No other channel mapping families are currently defined.*/
+ else return OP_EBADHEADER;
+ if(_head!=NULL)memcpy(_head,&head,head.mapping-(unsigned char *)&head);
+ return 0;
+}
+
+void opus_tags_init(OpusTags *_tags){
+ memset(_tags,0,sizeof(*_tags));
+}
+
+void opus_tags_clear(OpusTags *_tags){
+ int i;
+ for(i=_tags->comments;i-->0;)_ogg_free(_tags->user_comments[i]);
+ _ogg_free(_tags->user_comments);
+ _ogg_free(_tags->comment_lengths);
+ _ogg_free(_tags->vendor);
+}
+
+/*The actual implementation of opus_tags_parse().
+ Unlike the public API, this function requires _tags to already be
+ initialized, modifies its contents before success is guaranteed, and assumes
+ the caller will clear it on error.*/
+int opus_tags_parse_impl(OpusTags *_tags,
+ const unsigned char *_data,size_t _len){
+ opus_uint32 count;
+ size_t size;
+ size_t len;
+ int ncomments;
+ int i;
+ len=_len;
+ if(len<8)return OP_ENOTFORMAT;
+ if(memcmp(_data,"OpusTags",8)!=0)return OP_ENOTFORMAT;
+ if(len<16)return OP_EBADHEADER;
+ _data+=8;
+ len-=8;
+ count=op_parse_uint32le(_data);
+ _data+=4;
+ len-=4;
+ if(count>len)return OP_EBADHEADER;
+ if(_tags!=NULL){
+ char *vendor;
+ size=count+1;
+ if(size<count)return OP_EFAULT;
+ vendor=(char *)_ogg_malloc(size);
+ if(vendor==NULL)return OP_EFAULT;
+ memcpy(vendor,_data,count);
+ vendor[count]='\0';
+ _tags->vendor=vendor;
+ }
+ _data+=count;
+ len-=count;
+ if(len<4)return OP_EBADHEADER;
+ count=op_parse_uint32le(_data);
+ _data+=4;
+ len-=4;
+ /*Check to make sure there's minimally sufficient data left in the packet.*/
+ if(count>len>>2)return OP_EBADHEADER;
+ /*Check for overflow (the API limits this to an int).*/
+ if(count>(opus_uint32)INT_MAX-1)return OP_EFAULT;
+ if(_tags!=NULL){
+ size=sizeof(*_tags->comment_lengths)*(count+1);
+ if(size/sizeof(*_tags->comment_lengths)!=count+1)return OP_EFAULT;
+ _tags->comment_lengths=(int *)_ogg_malloc(size);
+ size=sizeof(*_tags->user_comments)*(count+1);
+ if(size/sizeof(*_tags->user_comments)!=count+1)return OP_EFAULT;
+ _tags->user_comments=(char **)_ogg_malloc(size);
+ if(_tags->comment_lengths==NULL||_tags->user_comments==NULL){
+ return OP_EFAULT;
+ }
+ }
+ ncomments=(int)count;
+ for(i=0;i<ncomments;i++){
+ /*Check to make sure there's minimally sufficient data left in the packet.*/
+ if((size_t)(ncomments-i)>len>>2)return OP_EBADHEADER;
+ count=op_parse_uint32le(_data);
+ _data+=4;
+ len-=4;
+ if(count>len)return OP_EBADHEADER;
+ /*Check for overflow (the API limits this to an int).*/
+ if(count>(opus_uint32)INT_MAX)return OP_EFAULT;
+ if(_tags!=NULL){
+ _tags->comment_lengths[i]=(int)count;
+ size=count+1;
+ if(size<count)return OP_EFAULT;
+ _tags->user_comments[i]=(char *)_ogg_malloc(size);
+ if(_tags->user_comments[i]==NULL)return OP_EFAULT;
+ _tags->comments=i+1;
+ memcpy(_tags->user_comments[i],_data,count);
+ _tags->user_comments[i][count]='\0';
+ }
+ _data+=count;
+ len-=count;
+ }
+ if(_tags!=NULL){
+ _tags->user_comments[ncomments]=NULL;
+ _tags->comment_lengths[ncomments]=0;
+ }
+ return 0;
+}
+
+int opus_tags_parse(OpusTags *_tags,const unsigned char *_data,size_t _len){
+ if(_tags!=NULL){
+ OpusTags tags;
+ int ret;
+ opus_tags_init(&tags);
+ ret=opus_tags_parse_impl(&tags,_data,_len);
+ if(ret<0)opus_tags_clear(&tags);
+ else *_tags=*&tags;
+ return ret;
+ }
+ else return opus_tags_parse_impl(NULL,_data,_len);
+}
+
+/*Add room for a new comment.*/
+static int op_tags_add_prepare(OpusTags *_tags){
+ char **user_comments;
+ int *comment_lengths;
+ int ncomments;
+ ncomments=_tags->comments;
+ user_comments=_ogg_realloc(_tags->user_comments,
+ sizeof(*_tags->user_comments)*(ncomments+2));
+ if(OP_UNLIKELY(user_comments==NULL))return OP_EFAULT;
+ _tags->user_comments=user_comments;
+ comment_lengths=_ogg_realloc(_tags->comment_lengths,
+ sizeof(*_tags->comment_lengths)*(ncomments+2));
+ if(OP_UNLIKELY(comment_lengths==NULL))return OP_EFAULT;
+ _tags->comment_lengths=comment_lengths;
+ comment_lengths[ncomments]=comment_lengths[ncomments+1]=0;
+ /*Our caller will always set user_comments[ncomments].*/
+ user_comments[ncomments+1]=NULL;
+ return 0;
+}
+
+int opus_tags_add(OpusTags *_tags,const char *_tag,const char *_value){
+ char *comment;
+ int tag_len;
+ int value_len;
+ int ncomments;
+ int ret;
+ ret=op_tags_add_prepare(_tags);
+ if(OP_UNLIKELY(ret<0))return ret;
+ tag_len=strlen(_tag);
+ value_len=strlen(_value);
+ ncomments=_tags->comments;
+ /*+2 for '=' and '\0'.*/
+ _tags->user_comments[ncomments]=comment=
+ (char *)_ogg_malloc(sizeof(*comment)*(tag_len+value_len+2));
+ if(OP_UNLIKELY(comment==NULL))return OP_EFAULT;
+ _tags->comment_lengths[ncomments]=tag_len+value_len+1;
+ memcpy(comment,_tag,sizeof(*comment)*tag_len);
+ comment[tag_len]='=';
+ memcpy(comment+tag_len+1,_value,sizeof(*comment)*(value_len+1));
+ return 0;
+}
+
+int opus_tags_add_comment(OpusTags *_tags,const char *_comment){
+ char *comment;
+ int ncomments;
+ int comment_len;
+ int ret;
+ ret=op_tags_add_prepare(_tags);
+ if(OP_UNLIKELY(ret<0))return ret;
+ comment_len=strlen(_comment);
+ ncomments=_tags->comments;
+ _tags->user_comments[ncomments]=comment=(char *)
+ _ogg_malloc(sizeof(*_tags->user_comments[ncomments])*(comment_len+1));
+ if(OP_UNLIKELY(comment==NULL))return OP_EFAULT;
+ _tags->comment_lengths[ncomments]=comment_len;
+ memcpy(comment,_comment,sizeof(*comment)*(comment_len+1));
+ return 0;
+}
+
+/*Is _a a "tag=value" comment whose tag matches _b?
+ 0 if it is, a non-zero value otherwise.*/
+static int op_tagcompare(const char *_a,const char *_b,int _n){
+ return op_strncasecmp(_a,_b,_n)||_a[_n]!='=';
+}
+
+const char *opus_tags_query(const OpusTags *_tags,const char *_tag,int _count){
+ char **user_comments;
+ int tag_len;
+ int found;
+ int ncomments;
+ int ci;
+ tag_len=strlen(_tag);
+ ncomments=_tags->comments;
+ user_comments=_tags->user_comments;
+ found=0;
+ for(ci=0;ci<ncomments;ci++){
+ if(!op_tagcompare(user_comments[ci],_tag,tag_len)){
+ /*We return a pointer to the data, not a copy.*/
+ if(_count==found++)return user_comments[ci]+tag_len+1;
+ }
+ }
+ /*Didn't find anything.*/
+ return NULL;
+}
+
+int opus_tags_query_count(const OpusTags *_tags,const char *_tag){
+ char **user_comments;
+ int tag_len;
+ int found;
+ int ncomments;
+ int ci;
+ tag_len=strlen(_tag);
+ ncomments=_tags->comments;
+ user_comments=_tags->user_comments;
+ found=0;
+ for(ci=0;ci<ncomments;ci++){
+ if(!op_tagcompare(user_comments[ci],_tag,tag_len))found++;
+ }
+ return found;
+}
generated by cgit (git 2.34.1) at 2025-02-20 19:18:11 +0000