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| author | Justin Ruggles <justin.ruggles@gmail.com> | 2009-05-17 06:53:24 +0000 |
|---|---|---|
| committer | Justin Ruggles <justin.ruggles@gmail.com> | 2009-05-17 06:53:24 +0000 |
| commit | 9a7a71ed4c8a593e4b946d8a4ac16ce71306248f (patch) | |
| tree | 05ab5d860f9eff008d2cf891d689839c76361c5c /libavcodec/ac3dec_data.c | |
| parent | db2f209352272c0c3a48feb9a15bf773d5272c28 (diff) | |
| download | ffmpeg-9a7a71ed4c8a593e4b946d8a4ac16ce71306248f.tar.gz | |
eac3dec: use 16-bit pre-mantissas instead of 24-bit in AHT decoding. it is
simpler and also fixes a bug in GAQ dequantization.
Originally committed as revision 18860 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/ac3dec_data.c')
| -rw-r--r-- | libavcodec/ac3dec_data.c | 21 |
1 files changed, 10 insertions, 11 deletions
diff --git a/libavcodec/ac3dec_data.c b/libavcodec/ac3dec_data.c index 2a3719ea07..b9f98f904e 100644 --- a/libavcodec/ac3dec_data.c +++ b/libavcodec/ac3dec_data.c @@ -87,19 +87,18 @@ const int16_t ff_eac3_gaq_remap_2_4_a[9][2] = { /** * Table E3.6, Gk=2 & Gk=4, B * Large mantissa inverse quantization, negative mantissa remapping offsets - * Table values from the spec are right-shifted by 8 to simplify calculations. * ff_eac3_gaq_remap_3_4_b[hebap-8][Gk=2,4] */ -const int8_t ff_eac3_gaq_remap_2_4_b[9][2] = { - { -22, -5 }, - { -46, -20 }, - { -56, -26 }, - { -60, -29 }, - { -62, -31 }, - { -63, -32 }, - { -64, -32 }, - { -64, -32 }, - { -64, -32 }, +const int16_t ff_eac3_gaq_remap_2_4_b[9][2] = { + { -5461, -1170 }, + { -11703, -4915 }, + { -14199, -6606 }, + { -15327, -7412 }, + { -15864, -7805 }, + { -16126, -7999 }, + { -16255, -8096 }, + { -16320, -8144 }, + { -16352, -8168 } }; static const int16_t vq_hebap1[4][6] = { |