virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-11-21 10:55:51 +02:00
Code Issues Releases Activity

avcodec/mpegvideo: Change mpeg2 unquant to work with higher precission qscale

Browse Source 
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-09-17 23:47:06 +02:00
parent 90d239a441
commit 2d35757814
3 changed files with 24 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
libavcodec/mips/mpegvideo_init_mips.c
View File

@ -26,6 +26,7 @@ static av_cold void dct_unquantize_init_msa(MpegEncContext *s)
{
s->dct_unquantize_h263_intra = ff_dct_unquantize_h263_intra_msa;
s->dct_unquantize_h263_inter = ff_dct_unquantize_h263_inter_msa;
if (!s->q_scale_type)
s->dct_unquantize_mpeg2_inter = ff_dct_unquantize_mpeg2_inter_msa;
}
#endif // #if HAVE_MSA
@ -39,6 +40,7 @@ static av_cold void dct_unquantize_init_mmi(MpegEncContext *s)
s->dct_unquantize_mpeg1_inter = ff_dct_unquantize_mpeg1_inter_mmi;
if (!(s->avctx->flags & AV_CODEC_FLAG_BITEXACT))
if (!s->q_scale_type)
s->dct_unquantize_mpeg2_intra = ff_dct_unquantize_mpeg2_intra_mmi;
s->denoise_dct= ff_denoise_dct_mmi;

18
libavcodec/mpegvideo.c
View File

@ -114,6 +114,8 @@ static void dct_unquantize_mpeg2_intra_c(MpegEncContext *s,
int i, level, nCoeffs;
const uint16_t *quant_matrix;
qscale <<= 1;
if(s->alternate_scan) nCoeffs= 63;
else nCoeffs= s->block_last_index[n];
@ -125,10 +127,10 @@ static void dct_unquantize_mpeg2_intra_c(MpegEncContext *s,
if (level) {
if (level < 0) {
level = -level;
level = (int)(level * qscale * quant_matrix[j]) >> 3;
level = (int)(level * qscale * quant_matrix[j]) >> 4;
level = -level;
} else {
level = (int)(level * qscale * quant_matrix[j]) >> 3;
level = (int)(level * qscale * quant_matrix[j]) >> 4;
}
block[j] = level;
}
@ -142,6 +144,8 @@ static void dct_unquantize_mpeg2_intra_bitexact(MpegEncContext *s,
const uint16_t *quant_matrix;
int sum=-1;
qscale <<= 1;
if(s->alternate_scan) nCoeffs= 63;
else nCoeffs= s->block_last_index[n];
@ -154,10 +158,10 @@ static void dct_unquantize_mpeg2_intra_bitexact(MpegEncContext *s,
if (level) {
if (level < 0) {
level = -level;
level = (int)(level * qscale * quant_matrix[j]) >> 3;
level = (int)(level * qscale * quant_matrix[j]) >> 4;
level = -level;
} else {
level = (int)(level * qscale * quant_matrix[j]) >> 3;
level = (int)(level * qscale * quant_matrix[j]) >> 4;
}
block[j] = level;
sum+=level;
@ -173,6 +177,8 @@ static void dct_unquantize_mpeg2_inter_c(MpegEncContext *s,
const uint16_t *quant_matrix;
int sum=-1;
qscale <<= 1;
if(s->alternate_scan) nCoeffs= 63;
else nCoeffs= s->block_last_index[n];
@ -184,11 +190,11 @@ static void dct_unquantize_mpeg2_inter_c(MpegEncContext *s,
if (level < 0) {
level = -level;
level = (((level << 1) + 1) * qscale *
((int) (quant_matrix[j]))) >> 4;
((int) (quant_matrix[j]))) >> 5;
level = -level;
} else {
level = (((level << 1) + 1) * qscale *
((int) (quant_matrix[j]))) >> 4;
((int) (quant_matrix[j]))) >> 5;
}
block[j] = level;
sum+=level;

12
libavcodec/x86/mpegvideo.c
View File

@ -308,6 +308,8 @@ static void dct_unquantize_mpeg2_intra_mmx(MpegEncContext *s,
av_assert2(s->block_last_index[n]>=0);
qscale <<= 1;
if(s->alternate_scan) nCoeffs= 63; //FIXME
else nCoeffs= s->intra_scantable.raster_end[ s->block_last_index[n] ];
@ -345,8 +347,8 @@ __asm__ volatile(
"pxor %%mm5, %%mm5 \n\t" // FIXME slow
"pcmpeqw (%0, %%"REG_a"), %%mm4 \n\t" // block[i] == 0 ? -1 : 0
"pcmpeqw 8(%0, %%"REG_a"), %%mm5\n\t" // block[i] == 0 ? -1 : 0
"psraw $3, %%mm0 \n\t"
"psraw $3, %%mm1 \n\t"
"psraw $4, %%mm0 \n\t"
"psraw $4, %%mm1 \n\t"
"pxor %%mm2, %%mm0 \n\t"
"pxor %%mm3, %%mm1 \n\t"
"psubw %%mm2, %%mm0 \n\t"
@ -373,6 +375,8 @@ static void dct_unquantize_mpeg2_inter_mmx(MpegEncContext *s,
av_assert2(s->block_last_index[n]>=0);
qscale <<= 1;
if(s->alternate_scan) nCoeffs= 63; //FIXME
else nCoeffs= s->intra_scantable.raster_end[ s->block_last_index[n] ];
@ -410,8 +414,8 @@ __asm__ volatile(
"pxor %%mm5, %%mm5 \n\t" // FIXME slow
"pcmpeqw (%0, %%"REG_a"), %%mm4 \n\t" // block[i] == 0 ? -1 : 0
"pcmpeqw 8(%0, %%"REG_a"), %%mm5\n\t" // block[i] == 0 ? -1 : 0
"psrlw $4, %%mm0 \n\t"
"psrlw $4, %%mm1 \n\t"
"psrlw $5, %%mm0 \n\t"
"psrlw $5, %%mm1 \n\t"
"pxor %%mm2, %%mm0 \n\t"
"pxor %%mm3, %%mm1 \n\t"
"psubw %%mm2, %%mm0 \n\t"