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do nal reformating when muxing H264, create avcc atom

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Originally committed as revision 5150 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Baptiste Coudurier 2006-03-11 18:18:17 +00:00
parent 70a61ed4e4
commit c1b8e6d8a8
1 changed files with 128 additions and 0 deletions
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128
libavformat/movenc.c
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@ -360,6 +360,116 @@ static int mov_write_svq3_tag(ByteIOContext *pb)
return 0x15;
}
static uint8_t *avc_find_startcode( uint8_t *p, uint8_t *end )
{
uint8_t *a = p + 4 - ((int)p & 3);
for( end -= 3; p < a && p < end; p++ ) {
if( p[0] == 0 && p[1] == 0 && p[2] == 1 )
return p;
}
for( end -= 3; p < end; p += 4 ) {
uint32_t x = *(uint32_t*)p;
// if( (x - 0x01000100) & (~x) & 0x80008000 ) // little endian
// if( (x - 0x00010001) & (~x) & 0x00800080 ) // big endian
if( (x - 0x01010101) & (~x) & 0x80808080 ) { // generic
if( p[1] == 0 ) {
if( p[0] == 0 && p[2] == 1 )
return p;
if( p[2] == 0 && p[3] == 1 )
return p+1;
}
if( p[3] == 0 ) {
if( p[2] == 0 && p[4] == 1 )
return p+2;
if( p[4] == 0 && p[5] == 1 )
return p+3;
}
}
}
for( end += 3; p < end; p++ ) {
if( p[0] == 0 && p[1] == 0 && p[2] == 1 )
return p;
}
return end + 3;
}
static void avc_parse_nal_units(uint8_t **buf, int *size)
{
ByteIOContext pb;
uint8_t *p = *buf;
uint8_t *end = p + *size;
uint8_t *nal_start, *nal_end;
url_open_dyn_buf(&pb);
nal_start = avc_find_startcode(p, end);
while (nal_start < end) {
while(!*(nal_start++));
nal_end = avc_find_startcode(nal_start, end);
put_be32(&pb, nal_end - nal_start);
put_buffer(&pb, nal_start, nal_end - nal_start);
nal_start = nal_end;
}
av_freep(buf);
*size = url_close_dyn_buf(&pb, buf);
}
static int mov_write_avcc_tag(ByteIOContext *pb, MOVTrack *track)
{
offset_t pos = url_ftell(pb);
put_be32(pb, 0);
put_tag(pb, "avcC");
if (track->vosLen > 6) {
/* check for h264 start code */
if (BE_32(track->vosData) == 0x00000001) {
uint8_t *buf, *end;
uint32_t sps_size=0, pps_size=0;
uint8_t *sps=0, *pps=0;
avc_parse_nal_units(&track->vosData, &track->vosLen);
buf = track->vosData;
end = track->vosData + track->vosLen;
put_byte(pb, 1); /* version */
put_byte(pb, 77); /* profile */
put_byte(pb, 64); /* profile compat */
put_byte(pb, 30); /* level */
put_byte(pb, 0xff); /* 6 bits reserved (111111) + 2 bits nal size length - 1 (11) */
put_byte(pb, 0xe1); /* 3 bits reserved (111) + 5 bits number of sps (00001) */
/* look for sps and pps */
while (buf < end) {
unsigned int size;
uint8_t nal_type;
size = BE_32(buf);
nal_type = buf[4] & 0x1f;
if (nal_type == 7) { /* SPS */
sps = buf + 4;
sps_size = size;
} else if (nal_type == 8) { /* PPS */
pps = buf + 4;
pps_size = size;
}
buf += size + 4;
}
assert(sps);
assert(pps);
put_be16(pb, sps_size);
put_buffer(pb, sps, sps_size);
put_byte(pb, 1); /* number of pps */
put_be16(pb, pps_size);
put_buffer(pb, pps, pps_size);
} else {
put_buffer(pb, track->vosData, track->vosLen);
}
}
return updateSize(pb, pos);
}
static unsigned int descrLength(unsigned int len)
{
if (len < 0x00000080)
@ -557,6 +667,8 @@ static int mov_write_video_tag(ByteIOContext *pb, MOVTrack* track)
mov_write_d263_tag(pb);
else if(track->enc->codec_id == CODEC_ID_SVQ3)
mov_write_svq3_tag(pb);
else if(track->enc->codec_id == CODEC_ID_H264)
mov_write_avcc_tag(pb, track);
return updateSize (pb, pos);
}
@ -1523,6 +1635,22 @@ static int mov_write_packet(AVFormatContext *s, AVPacket *pkt)
memcpy(trk->vosData, enc->extradata, trk->vosLen);
}
if (enc->codec_id == CODEC_ID_H264) {
if (trk->vosLen == 0) {
/* copy extradata */
trk->vosLen = enc->extradata_size;
trk->vosData = av_malloc(trk->vosLen);
memcpy(trk->vosData, enc->extradata, trk->vosLen);
}
if (*(uint8_t *)trk->vosData != 1) {
/* from x264 or from bytestream h264 */
/* nal reformating needed */
avc_parse_nal_units(&pkt->data, &pkt->size);
assert(pkt->size);
size = pkt->size;
}
}
cl = trk->entry / MOV_INDEX_CLUSTER_SIZE;
id = trk->entry % MOV_INDEX_CLUSTER_SIZE;