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modify msmpeg4 functions to generate VC1 compatible block layer bitstream

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patch by Fortin Denis: \fortin nerim net/
original thread: [FFmpeg-devel] [PATCH] wmv3 encoder : msmpeg4.c changes
date: 06/19/2007 09:54 PM

Originally committed as revision 9386 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fortin Denis 2007-06-22 08:35:21 +00:00 committed by Benoit Fouet
parent 69a6db95ac
commit b05b193172
1 changed files with 21 additions and 5 deletions
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26
libavcodec/msmpeg4.c
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@ -783,7 +783,8 @@ static inline int msmpeg4_pred_dc(MpegEncContext * s, int n,
static void msmpeg4_encode_dc(MpegEncContext * s, int level, int n, int *dir_ptr)
{
int sign, code;
int pred;
int pred, extquant;
int extrabits = 0;
if(s->msmpeg4_version==1){
int32_t *dc_val;
@ -825,6 +826,15 @@ static void msmpeg4_encode_dc(MpegEncContext * s, int level, int n, int *dir_ptr
code = level;
if (code > DC_MAX)
code = DC_MAX;
else if( s->msmpeg4_version>=6 ) {
if( s->qscale == 1 ) {
extquant = (level + 3) & 0x3;
code = ((level+3)>>2);
} else if( s->qscale == 2 ) {
extquant = (level + 1) & 0x1;
code = ((level+1)>>1);
}
}
if (s->dc_table_index == 0) {
if (n < 4) {
@ -840,8 +850,13 @@ static void msmpeg4_encode_dc(MpegEncContext * s, int level, int n, int *dir_ptr
}
}
if(s->msmpeg4_version>=6 && s->qscale<=2)
extrabits = 3 - s->qscale;
if (code == DC_MAX)
put_bits(&s->pb, 8, level);
put_bits(&s->pb, 8 + extrabits, level);
else if(extrabits > 0)//== VC1 && s->qscale<=2
put_bits(&s->pb, extrabits, extquant);
if (level != 0) {
put_bits(&s->pb, 1, sign);
@ -868,7 +883,7 @@ void ff_msmpeg4_encode_block(MpegEncContext * s, DCTELEM * block, int n)
} else {
rl = &rl_table[3 + s->rl_chroma_table_index];
}
run_diff = 0;
run_diff = s->msmpeg4_version>=6;
scantable= s->intra_scantable.permutated;
} else {
i = 0;
@ -881,7 +896,7 @@ void ff_msmpeg4_encode_block(MpegEncContext * s, DCTELEM * block, int n)
}
/* recalculate block_last_index for M$ wmv1 */
if(s->msmpeg4_version>=4 && s->block_last_index[n]>0){
if(s->msmpeg4_version>=4 && s->msmpeg4_version<6 && s->block_last_index[n]>0){
for(last_index=63; last_index>=0; last_index--){
if(block[scantable[last_index]]) break;
}
@ -937,8 +952,9 @@ else
if(s->esc3_level_length==0){
s->esc3_level_length=8;
s->esc3_run_length= 6;
//ESCLVLSZ + ESCRUNSZ
if(s->qscale<8)
put_bits(&s->pb, 6, 3);
put_bits(&s->pb, 6 + (s->msmpeg4_version>=6), 3);
else
put_bits(&s->pb, 8, 3);
}