RepoMirrors/ffmpeg
1
0
Fork 0
mirror of https://git.ffmpeg.org/ffmpeg.git synced 2024-12-25 16:52:31 +00:00
Code Issues Projects Releases Wiki Activity

h264_parser: AVC support.

Browse Source 
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-10-03 20:25:43 +02:00
parent 2f503851c6
commit d5c0e89e7a
1 changed files with 28 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
libavcodec/h264_parser.c
View File

@ -34,30 +34,48 @@
static int ff_h264_find_frame_end(H264Context *h, const uint8_t *buf, int buf_size)
{
int i;
int i, j;
uint32_t state;
ParseContext *pc = &(h->s.parse_context);
int next_avc= h->is_avc ? 0 : buf_size;
//printf("first %02X%02X%02X%02X\n", buf[0], buf[1],buf[2],buf[3]);
// mb_addr= pc->mb_addr - 1;
state= pc->state;
if(state>13)
state= 7;
if(h->is_avc && !h->nal_length_size)
av_log(h->s.avctx, AV_LOG_ERROR, "AVC-parser: nal length size invalid\n");
for(i=0; i<buf_size; i++){
if(i >= next_avc) {
int nalsize = 0;
i = next_avc;
for(j = 0; j < h->nal_length_size; j++)
nalsize = (nalsize << 8) | buf[i++];
if(nalsize <= 0 || nalsize > buf_size - i){
av_log(h->s.avctx, AV_LOG_ERROR, "AVC-parser: nal size %d remaining %d\n", nalsize, buf_size - i);
return buf_size;
}
next_avc= i + nalsize;
state= 5;
}
if(state==7){
#if HAVE_FAST_UNALIGNED
/* we check i<buf_size instead of i+3/7 because its simpler
* and there should be FF_INPUT_BUFFER_PADDING_SIZE bytes at the end
*/
# if HAVE_FAST_64BIT
while(i<buf_size && !((~*(const uint64_t*)(buf+i) & (*(const uint64_t*)(buf+i) - 0x0101010101010101ULL)) & 0x8080808080808080ULL))
while(i<next_avc && !((~*(const uint64_t*)(buf+i) & (*(const uint64_t*)(buf+i) - 0x0101010101010101ULL)) & 0x8080808080808080ULL))
i+=8;
# else
while(i<buf_size && !((~*(const uint32_t*)(buf+i) & (*(const uint32_t*)(buf+i) - 0x01010101U)) & 0x80808080U))
while(i<next_avc && !((~*(const uint32_t*)(buf+i) & (*(const uint32_t*)(buf+i) - 0x01010101U)) & 0x80808080U))
i+=4;
# endif
#endif
for(; i<buf_size; i++){
for(; i<next_avc; i++){
if(!buf[i]){
state=2;
break;
@ -89,11 +107,15 @@ static int ff_h264_find_frame_end(H264Context *h, const uint8_t *buf, int buf_si
}
}
pc->state= state;
if(h->is_avc)
return next_avc;
return END_NOT_FOUND;
found:
pc->state=7;
pc->frame_start_found= 0;
if(h->is_avc)
return next_avc;
return i-(state&5);
}
@ -278,6 +300,7 @@ static int h264_parse(AVCodecParserContext *s,
}
}
if(!h->is_avc){
parse_nal_units(s, avctx, buf, buf_size);
if (h->sei_cpb_removal_delay >= 0) {
@ -293,6 +316,7 @@ static int h264_parse(AVCodecParserContext *s,
if (s->flags & PARSER_FLAG_ONCE) {
s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
}
}
*poutbuf = buf;
*poutbuf_size = buf_size;