[FFmpeg-devel] [PATCH] G.729 LSF decoding

[Vladimir Voroshilov]

2009/6/24 Michael Niedermayer <michaelni at gmx.at>:
> On Wed, Jun 24, 2009 at 12:56:14PM +0700, Vladimir Voroshilov wrote:
> [...]
>> ?g729data.h | ? 25 +++++++++++++++++++++++++
>> ?g729dec.c ?| ? ?9 +++++++++
>> ?2 files changed, 34 insertions(+)
>> 9a0593d79acb41466fdfd18622d2c4993cacf8ff ?0003-doxy-comments-for-LSF-array.169.patch
>> From a44ce37543e86a231e2ec1fffcffdf588338388e Mon Sep 17 00:00:00 2001
>> From: Vladimir Voroshilov <voroshil at gmail.com>
>> Date: Tue, 23 Jun 2009 12:39:33 +0700
>> Subject: [PATCH 03/25] doxy comments for LSF array
>>
>>
>> diff --git ffmpeg-r19260/libavcodec/g729data.h ffmpeg-r19260_v169/libavcodec/g729data.h
>> index 02d0b93..a7d73fd 100644
>> --- ffmpeg-r19260/libavcodec/g729data.h
>> +++ ffmpeg-r19260_v169/libavcodec/g729data.h
>> @@ -247,6 +247,25 @@ static const int16_t cb_gain_2nd_8k[1<<GC_2ND_IDX_BITS_8K][2] = { /*(1.14) (1.13
>>
>> ?/**
>> ? * 4th order Moving Average (MA) Predictor codebook (3.2.4 of G.729)
>> + *
>> + * float cb_ma_predictor_float[2][MA_NP][10] = {
>> + * ? {
>> + * ? ? {0.2570, 0.2780, 0.2800, 0.2736, 0.2757, 0.2764, 0.2675, 0.2678, 0.2779, 0.2647},
>> + * ? ? {0.2142, 0.2194, 0.2331, 0.2230, 0.2272, 0.2252, 0.2148, 0.2123, 0.2115, 0.2096},
>> + * ? ? {0.1670, 0.1523, 0.1567, 0.1580, 0.1601, 0.1569, 0.1589, 0.1555, 0.1474, 0.1571},
>> + * ? ? {0.1238, 0.0925, 0.0798, 0.0923, 0.0890, 0.0828, 0.1010, 0.0988, 0.0872, 0.1060},
>> + * ? },
>> + * ? {
>> + * ? ? {0.2360, 0.2405, 0.2499, 0.2495, 0.2517, 0.2591, 0.2636, 0.2625, 0.2551, 0.2310},
>> + * ? ? {0.1285, 0.0925, 0.0779, 0.1060, 0.1183, 0.1176, 0.1277, 0.1268, 0.1193, 0.1211},
>> + * ? ? {0.0981, 0.0589, 0.0401, 0.0654, 0.0761, 0.0728, 0.0841, 0.0826, 0.0776, 0.0891},
>> + * ? ? {0.0923, 0.0486, 0.0287, 0.0498, 0.0526, 0.0482, 0.0621, 0.0636, 0.0584, 0.0794},
>> + * ? },
>> + * };
>> + * ? ? ? ? ? ? ? ? ? ? ? ? ? ? 15
>> + * cb_ma_predictor[j][k][i] = 2 * cb_ma_predictor_float[j][k][i]
>
> thats not mathematically correct, = mean equal ...

Do you mean dropping decimal part?
How can i fix this then ? I'm in doubt.

>
> [...]
> --
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-- 
Regards,
Vladimir Voroshilov     mailto:voroshil at gmail.com
JID: voroshil at gmail.com, voroshil at jabber.ru
ICQ: 95587719