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generate even more complete mpeg4 headers

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Originally committed as revision 329 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2002-03-13 12:50:41 +00:00
parent 6f91bcd151
commit 10cd581572
1 changed files with 67 additions and 8 deletions
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75
libavcodec/h263.c
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@ -587,15 +587,68 @@ static void put_string(PutBitContext * pbc, char *s)
put_bits(pbc, 8, 0);
}
/* write mpeg4 VOP header */
void mpeg4_encode_picture_header(MpegEncContext * s, int picture_number)
static void mpeg4_encode_vol_header(MpegEncContext * s)
{
int vo_ver_id=1; //must be 2 if we want GMC or q-pel
if(get_bit_count(&s->pb)!=0) mpeg4_stuffing(&s->pb);
put_bits(&s->pb, 16, 0);
put_bits(&s->pb, 16, 0x100); /* video obj */
put_bits(&s->pb, 16, 0);
put_bits(&s->pb, 16, 0x120); /* video obj layer */
put_bits(&s->pb, 1, 0); /* random access vol */
put_bits(&s->pb, 8, 1); /* video obj type indication= simple obj */
put_bits(&s->pb, 1, 1); /* is obj layer id= yes */
put_bits(&s->pb, 4, vo_ver_id); /* is obj layer ver id */
put_bits(&s->pb, 3, 1); /* is obj layer priority */
put_bits(&s->pb, 4, 1); /* aspect ratio info= sqare pixel */ //FIXME real aspect
put_bits(&s->pb, 1, 0); /* vol control parameters= no */
put_bits(&s->pb, 2, RECT_SHAPE); /* vol shape= rectangle */
put_bits(&s->pb, 1, 1); /* marker bit */
put_bits(&s->pb, 16, s->time_increment_resolution=30000);
s->time_increment_bits = av_log2(s->time_increment_resolution - 1) + 1;
if (s->time_increment_bits < 1)
s->time_increment_bits = 1;
put_bits(&s->pb, 1, 1); /* marker bit */
put_bits(&s->pb, 1, 0); /* fixed vop rate=no */
put_bits(&s->pb, 1, 1); /* marker bit */
put_bits(&s->pb, 13, s->width); /* vol width */
put_bits(&s->pb, 1, 1); /* marker bit */
put_bits(&s->pb, 13, s->height); /* vol height */
put_bits(&s->pb, 1, 1); /* marker bit */
put_bits(&s->pb, 1, 0); /* interlace */
put_bits(&s->pb, 1, 1); /* obmc disable */
if (vo_ver_id == 1) {
put_bits(&s->pb, 1, s->vol_sprite_usage=0); /* sprite enable */
}else{ /* vo_ver_id == 2 */
put_bits(&s->pb, 2, s->vol_sprite_usage=0); /* sprite enable */
}
put_bits(&s->pb, 1, 0); /* not 8 bit */
put_bits(&s->pb, 1, 0); /* quant type= h263 style*/
if (vo_ver_id != 1)
put_bits(&s->pb, 1, s->quarter_sample=0);
put_bits(&s->pb, 1, 1); /* complexity estimation disable */
put_bits(&s->pb, 1, 1); /* resync marker disable */
put_bits(&s->pb, 1, 0); /* data partitioned */
if (vo_ver_id != 1){
put_bits(&s->pb, 1, 0); /* newpred */
put_bits(&s->pb, 1, 0); /* reduced res vop */
}
put_bits(&s->pb, 1, 0); /* scalability */
mpeg4_stuffing(&s->pb);
put_bits(&s->pb, 16, 0);
put_bits(&s->pb, 16, 0x1B2); /* user_data */
put_string(&s->pb, "ffmpeg"); //FIXME append some version ...
mpeg4_stuffing(&s->pb);
}
/* write mpeg4 VOP header */
void mpeg4_encode_picture_header(MpegEncContext * s, int picture_number)
{
if(s->pict_type==I_TYPE) mpeg4_encode_vol_header(s);
if(get_bit_count(&s->pb)!=0) mpeg4_stuffing(&s->pb);
put_bits(&s->pb, 16, 0); /* vop header */
put_bits(&s->pb, 16, 0x1B6); /* vop header */
put_bits(&s->pb, 2, s->pict_type - 1); /* pict type: I = 0 , P = 1 */
@ -604,19 +657,23 @@ void mpeg4_encode_picture_header(MpegEncContext * s, int picture_number)
put_bits(&s->pb, 1, 0);
put_bits(&s->pb, 1, 1); /* marker */
put_bits(&s->pb, 4, 1); /* XXX: correct time increment */
put_bits(&s->pb, s->time_increment_bits, 1); /* XXX: correct time increment */
put_bits(&s->pb, 1, 1); /* marker */
put_bits(&s->pb, 1, 1); /* vop coded */
if (s->pict_type == P_TYPE) {
s->no_rounding = 0;
if ( s->pict_type == P_TYPE
|| (s->pict_type == S_TYPE && s->vol_sprite_usage==GMC_SPRITE)) {
s->no_rounding ^= 1;
put_bits(&s->pb, 1, s->no_rounding); /* rounding type */
}
put_bits(&s->pb, 3, 0); /* intra dc VLC threshold */
//FIXME sprite stuff
put_bits(&s->pb, 5, s->qscale);
if (s->pict_type != I_TYPE)
put_bits(&s->pb, 3, s->f_code); /* fcode_for */
if (s->pict_type == B_TYPE)
put_bits(&s->pb, 3, s->b_code); /* fcode_back */
// printf("****frame %d\n", picture_number);
}
@ -1871,8 +1928,10 @@ int mpeg4_decode_picture_header(MpegEncContext * s)
}
state = ((state << 8) | v) & 0xffffff;
/* XXX: really detect end of frame */
if (state == 0)
if (state == 0){
printf("illegal zero code found\n");
return -1;
}
}
//printf("startcode %X %d\n", startcode, get_bits_count(&s->gb));
if (startcode == 0x120) { // Video Object Layer