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| author | Michael Niedermayer <michaelni@gmx.at> | 2006-04-28 17:03:52 +0000 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2006-04-28 17:03:52 +0000 |
| commit | e27b6e62f7711fae834ee2daee9b252a4fc9f6c0 (patch) | |
| tree | d5b0fdb7beec3ce405e53d3bd756774ca24a192a /libavcodec/mpegvideo.c | |
| parent | 6eb1427f0fbfe74946a104f067072131c693e570 (diff) | |
| download | ffmpeg-e27b6e62f7711fae834ee2daee9b252a4fc9f6c0.tar.gz | |
missmatch control for mpeg2 intra dequantization if bitexact=1
Originally committed as revision 5328 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/mpegvideo.c')
| -rw-r--r-- | libavcodec/mpegvideo.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c index c4fef9c3a1..7ae84994e2 100644 --- a/libavcodec/mpegvideo.c +++ b/libavcodec/mpegvideo.c @@ -47,6 +47,8 @@ static void dct_unquantize_mpeg1_inter_c(MpegEncContext *s, DCTELEM *block, int n, int qscale); static void dct_unquantize_mpeg2_intra_c(MpegEncContext *s, DCTELEM *block, int n, int qscale); +static void dct_unquantize_mpeg2_intra_bitexact(MpegEncContext *s, + DCTELEM *block, int n, int qscale); static void dct_unquantize_mpeg2_inter_c(MpegEncContext *s, DCTELEM *block, int n, int qscale); static void dct_unquantize_h263_intra_c(MpegEncContext *s, @@ -266,6 +268,8 @@ int DCT_common_init(MpegEncContext *s) s->dct_unquantize_mpeg1_intra = dct_unquantize_mpeg1_intra_c; s->dct_unquantize_mpeg1_inter = dct_unquantize_mpeg1_inter_c; s->dct_unquantize_mpeg2_intra = dct_unquantize_mpeg2_intra_c; + if(s->flags & CODEC_FLAG_BITEXACT) + s->dct_unquantize_mpeg2_intra = dct_unquantize_mpeg2_intra_bitexact; s->dct_unquantize_mpeg2_inter = dct_unquantize_mpeg2_inter_c; #ifdef CONFIG_ENCODERS @@ -6527,6 +6531,39 @@ static void dct_unquantize_mpeg2_intra_c(MpegEncContext *s, } } +static void dct_unquantize_mpeg2_intra_bitexact(MpegEncContext *s, + DCTELEM *block, int n, int qscale) +{ + int i, level, nCoeffs; + const uint16_t *quant_matrix; + int sum=-1; + + if(s->alternate_scan) nCoeffs= 63; + else nCoeffs= s->block_last_index[n]; + + if (n < 4) + block[0] = block[0] * s->y_dc_scale; + else + block[0] = block[0] * s->c_dc_scale; + quant_matrix = s->intra_matrix; + for(i=1;i<=nCoeffs;i++) { + int j= s->intra_scantable.permutated[i]; + level = block[j]; + if (level) { + if (level < 0) { + level = -level; + level = (int)(level * qscale * quant_matrix[j]) >> 3; + level = -level; + } else { + level = (int)(level * qscale * quant_matrix[j]) >> 3; + } + block[j] = level; + sum+=level; + } + } + block[63]^=sum&1; +} + static void dct_unquantize_mpeg2_inter_c(MpegEncContext *s, DCTELEM *block, int n, int qscale) { |