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Add support for parsing and decoding DCA-HD streams.

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Originally committed as revision 15951 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kostya Shishkov 2008-11-29 10:06:37 +00:00
parent d33ee3f2b1
commit d041a59897
3 changed files with 15 additions and 4 deletions
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5
libavcodec/dca.c
View File

@ -1175,8 +1175,9 @@ static int dca_convert_bitstream(const uint8_t * src, int src_size, uint8_t * ds
PutBitContext pb;
if((unsigned)src_size > (unsigned)max_size) {
av_log(NULL, AV_LOG_ERROR, "Input frame size larger then DCA_MAX_FRAME_SIZE!\n");
return -1;
// av_log(NULL, AV_LOG_ERROR, "Input frame size larger then DCA_MAX_FRAME_SIZE!\n");
// return -1;
src_size = max_size;
}
mrk = AV_RB32(src);

3
libavcodec/dca.h
View File

@ -31,4 +31,7 @@
#define DCA_MARKER_14B_BE 0x1FFFE800
#define DCA_MARKER_14B_LE 0xFF1F00E8
/** DCA-HD specific block starts with this marker. */
#define DCA_HD_MARKER 0x64582025
#endif /* AVCODEC_DCA_H */

11
libavcodec/dca_parser.c
View File

@ -34,6 +34,7 @@ typedef struct DCAParseContext {
uint32_t lastmarker;
int size;
int framesize;
int hd_pos;
} DCAParseContext;
#define IS_MARKER(state, i, buf, buf_size) \
@ -75,10 +76,16 @@ static int dca_find_frame_end(DCAParseContext * pc1, const uint8_t * buf,
for (; i < buf_size; i++) {
pc1->size++;
state = (state << 8) | buf[i];
if (state == pc1->lastmarker && IS_MARKER(state, i, buf, buf_size) && (!pc1->framesize || pc1->framesize == pc1->size)) {
if (state == DCA_HD_MARKER && !pc1->hd_pos)
pc1->hd_pos = pc1->size;
if (state == pc1->lastmarker && IS_MARKER(state, i, buf, buf_size)) {
if(pc1->framesize > pc1->size)
continue;
if(!pc1->framesize){
pc1->framesize = pc1->hd_pos ? pc1->hd_pos : pc1->size;
}
pc->frame_start_found = 0;
pc->state = -1;
pc1->framesize = pc1->size;
pc1->size = 0;
return i - 3;
}