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| author | Kenan Gillet <kenan.gillet@gmail.com> | 2008-11-21 18:39:16 +0000 |
|---|---|---|
| committer | Vitor Sessak <vitor1001@gmail.com> | 2008-11-21 18:39:16 +0000 |
| commit | 148c31b9c2ee8df91485f7ae55224fafe1555e1a (patch) | |
| tree | 0dac19b64f866db4e22fd4c6ed97babe39d967f1 /libavcodec/qcelpdata.h | |
| parent | 31fb59ec98838a15b45b50c6f8a16733be86e208 (diff) | |
| download | ffmpeg-148c31b9c2ee8df91485f7ae55224fafe1555e1a.tar.gz | |
More OKed parts of the QCELP decoder
patch by Kenan Gillet, kenan.gillet gmail com
Originally committed as revision 15901 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/qcelpdata.h')
| -rw-r--r-- | libavcodec/qcelpdata.h | 30 |
1 files changed, 28 insertions, 2 deletions
diff --git a/libavcodec/qcelpdata.h b/libavcodec/qcelpdata.h index 6916b95a0e..f1942ead83 100644 --- a/libavcodec/qcelpdata.h +++ b/libavcodec/qcelpdata.h @@ -391,6 +391,16 @@ static const qcelp_vector * const qcelp_lspvq[5] = { #define QCELP_SCALE 8192. /** + * the upper boundary of the clipping, depends on QCELP_SCALE + */ +#define QCELP_CLIP_UPPER_BOUND (8191.75/8192.) + +/** + * the lower boundary of the clipping, depends on QCELP_SCALE + */ +#define QCELP_CLIP_LOWER_BOUND -1. + +/** * table for computing Ga (decoded linear codebook gain magnitude) * * @note The table could fit in int16_t in x*8 form, but it seems @@ -470,7 +480,7 @@ static const int8_t qcelp_rate_half_codebook[128] = { /** * sqrt(1.887) is the maximum of the pseudorandom * white sequence used to generate the scaled codebook - * vector for framerate 1/4. + * vector for bitrate 1/4. * * TIA/EIA/IS-733 2.4.8.1.2 */ @@ -478,7 +488,7 @@ static const int8_t qcelp_rate_half_codebook[128] = { /** * table for impulse response of BPF used to filter - * the white excitation for framerate 1/4 synthesis + * the white excitation for bitrate 1/4 synthesis * * Only half the tables are needed because of symmetry. * @@ -490,4 +500,20 @@ static const double qcelp_rnd_fir_coefs[11] = { -9.918777e-2, 3.749518e-2, 8.985137e-1 }; +/** + * This spread factor is used, for bitrate 1/8 and I_F_Q, + * to force the LSP frequencies to be at least 80 Hz apart. + * + * TIA/EIA/IS-733 2.4.3.3.2 + */ +#define QCELP_LSP_SPREAD_FACTOR 0.02 + +/** + * predictor coefficient for the conversion of LSP codes + * to LSP frequencies for 1/8 and I_F_Q + * + * TIA/EIA/IS-733 2.4.3.2.7-2 + */ +#define QCELP_LSP_OCTAVE_PREDICTOR 29.0/32 + #endif /* AVCODEC_QCELPDATA_H */ |