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ac3dec: fix non-optimal dithering of zero bit mantissas

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Use a noise range of -0.707 to 0.707 instead of -0.5 to 0.5

Based on patch by: Mathias Rauen <madshi@gmail.com> and commit by Justin Ruggles (04ea5491)
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
pull/11/head
Michael Niedermayer 12 years ago
parent 144529e094
commit fbdb0313f5
2 changed files with 14 additions and 14 deletions
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  1. 2
      libavcodec/ac3dec.c
  2. 26
      tests/fate/ac3.mak

2
libavcodec/ac3dec.c
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@ -443,7 +443,7 @@ static void ac3_decode_transform_coeffs_ch(AC3DecodeContext *s, int ch_index, ma
switch (bap) {
case 0:
if (dither)
mantissa = (av_lfg_get(&s->dith_state) & 0x7FFFFF) - 0x400000;
mantissa = (((av_lfg_get(&s->dith_state)>>8)*181)>>8) - 5931008;
else
mantissa = 0;
break;

26
tests/fate/ac3.mak
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@ -1,46 +1,46 @@
FATE_AC3 += fate-ac3-2.0
fate-ac3-2.0: CMD = pcm -i $(SAMPLES)/ac3/monsters_inc_2.0_192_small.ac3
fate-ac3-2.0: REF = $(SAMPLES)/ac3/monsters_inc_2.0_192_small.pcm
fate-ac3-2.0: REF = $(SAMPLES)/ac3/monsters_inc_2.0_192_small_v2.pcm
FATE_AC3 += fate-ac3-4.0
fate-ac3-4.0: CMD = pcm -i $(SAMPLES)/ac3/millers_crossing_4.0.ac3
fate-ac3-4.0: REF = $(SAMPLES)/ac3/millers_crossing_4.0.pcm
fate-ac3-4.0: REF = $(SAMPLES)/ac3/millers_crossing_4.0_v2.pcm
FATE_AC3 += fate-ac3-4.0-downmix-mono
fate-ac3-4.0-downmix-mono: CMD = pcm -request_channels 1 -i $(SAMPLES)/ac3/millers_crossing_4.0.ac3
fate-ac3-4.0-downmix-mono: REF = $(SAMPLES)/ac3/millers_crossing_4.0_mono.pcm
fate-ac3-4.0-downmix-mono: REF = $(SAMPLES)/ac3/millers_crossing_4.0_mono_v2.pcm
FATE_AC3 += fate-ac3-4.0-downmix-stereo
fate-ac3-4.0-downmix-stereo: CMD = pcm -request_channels 2 -i $(SAMPLES)/ac3/millers_crossing_4.0.ac3
fate-ac3-4.0-downmix-stereo: REF = $(SAMPLES)/ac3/millers_crossing_4.0_stereo.pcm
fate-ac3-4.0-downmix-stereo: REF = $(SAMPLES)/ac3/millers_crossing_4.0_stereo_v2.pcm
FATE_AC3 += fate-ac3-5.1
fate-ac3-5.1: CMD = pcm -i $(SAMPLES)/ac3/monsters_inc_5.1_448_small.ac3
fate-ac3-5.1: REF = $(SAMPLES)/ac3/monsters_inc_5.1_448_small.pcm
fate-ac3-5.1: REF = $(SAMPLES)/ac3/monsters_inc_5.1_448_small_v2.pcm
FATE_AC3 += fate-ac3-5.1-downmix-mono
fate-ac3-5.1-downmix-mono: CMD = pcm -request_channels 1 -i $(SAMPLES)/ac3/monsters_inc_5.1_448_small.ac3
fate-ac3-5.1-downmix-mono: REF = $(SAMPLES)/ac3/monsters_inc_5.1_448_small_mono.pcm
fate-ac3-5.1-downmix-mono: REF = $(SAMPLES)/ac3/monsters_inc_5.1_448_small_mono_v2.pcm
FATE_AC3 += fate-ac3-5.1-downmix-stereo
fate-ac3-5.1-downmix-stereo: CMD = pcm -request_channels 2 -i $(SAMPLES)/ac3/monsters_inc_5.1_448_small.ac3
fate-ac3-5.1-downmix-stereo: REF = $(SAMPLES)/ac3/monsters_inc_5.1_448_small_stereo.pcm
fate-ac3-5.1-downmix-stereo: REF = $(SAMPLES)/ac3/monsters_inc_5.1_448_small_stereo_v2.pcm
FATE_EAC3 += fate-eac3-1
fate-eac3-1: CMD = pcm -i $(SAMPLES)/eac3/csi_miami_5.1_256_spx_small.eac3
fate-eac3-1: REF = $(SAMPLES)/eac3/csi_miami_5.1_256_spx_small.pcm
fate-eac3-1: REF = $(SAMPLES)/eac3/csi_miami_5.1_256_spx_small_v2.pcm
FATE_EAC3 += fate-eac3-2
fate-eac3-2: CMD = pcm -i $(SAMPLES)/eac3/csi_miami_stereo_128_spx_small.eac3
fate-eac3-2: REF = $(SAMPLES)/eac3/csi_miami_stereo_128_spx_small.pcm
fate-eac3-2: REF = $(SAMPLES)/eac3/csi_miami_stereo_128_spx_small_v2.pcm
FATE_EAC3 += fate-eac3-3
fate-eac3-3: CMD = pcm -i $(SAMPLES)/eac3/matrix2_commentary1_stereo_192_small.eac3
fate-eac3-3: REF = $(SAMPLES)/eac3/matrix2_commentary1_stereo_192_small.pcm
fate-eac3-3: REF = $(SAMPLES)/eac3/matrix2_commentary1_stereo_192_small_v2.pcm
FATE_EAC3 += fate-eac3-4
fate-eac3-4: CMD = pcm -i $(SAMPLES)/eac3/serenity_english_5.1_1536_small.eac3
fate-eac3-4: REF = $(SAMPLES)/eac3/serenity_english_5.1_1536_small.pcm
fate-eac3-4: REF = $(SAMPLES)/eac3/serenity_english_5.1_1536_small_v2.pcm
$(FATE_AC3) $(FATE_EAC3): CMP = oneoff
@ -50,14 +50,14 @@ FATE_EAC3-$(call DEMDEC, EAC3, EAC3) += $(FATE_EAC3)
FATE_AC3-$(call ENCDEC, AC3, AC3) += fate-ac3-encode
fate-ac3-encode: CMD = enc_dec_pcm ac3 wav s16le $(REF) -c:a ac3 -b:a 128k
fate-ac3-encode: CMP_SHIFT = -1024
fate-ac3-encode: CMP_TARGET = 399.62
fate-ac3-encode: CMP_TARGET = 404.53
fate-ac3-encode: SIZE_TOLERANCE = 488
fate-ac3-encode: FUZZ = 4
FATE_EAC3-$(call ENCDEC, EAC3, EAC3) += fate-eac3-encode
fate-eac3-encode: CMD = enc_dec_pcm eac3 wav s16le $(REF) -c:a eac3 -b:a 128k
fate-eac3-encode: CMP_SHIFT = -1024
fate-eac3-encode: CMP_TARGET = 514.02
fate-eac3-encode: CMP_TARGET = 516.94
fate-eac3-encode: SIZE_TOLERANCE = 488
fate-eac3-encode: FUZZ = 3

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