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Doxy for LSF erasure case

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Vladimir Voroshilov 2009-06-24 12:09:20 +07:00 committed by Michael Niedermayer
parent b29e5a6780
commit d1a643e749
2 changed files with 16 additions and 0 deletions
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9
libavcodec/g729data.h
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@ -293,6 +293,15 @@ static const int16_t cb_ma_predictor_sum[2][10] = { /* (0.15) */
{14585, 18333, 19772, 17344, 16426, 16459, 15155, 15220, 16043, 15708}
};
/**
* 12
* 2
* cb_ma_predictor_sum_inv[j][i] = floor(---------------------------------------------)
* 3
* 1.0 - sum ( cb_ma_predictor_float[j][k][i] )
* k=0
* j=0..1, i=0..9
*/
static const int16_t cb_ma_predictor_sum_inv[2][10] = { /* (3.12) */
{17210, 15888, 16357, 16183, 16516, 15833, 15888, 15421, 14840, 15597},
{ 9202, 7320, 6788, 7738, 8170, 8154, 8856, 8818, 8366, 8544}

7
libavcodec/g729dec.c
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@ -171,6 +171,13 @@ static void lsf_decode(int16_t* lsfq, int16_t* past_quantizer_outputs[MA_NP + 1]
ff_acelp_reorder_lsf(lsfq, LSFQ_DIFF_MIN, LSFQ_MIN, LSFQ_MAX, 10);
}
/**
* Restores past LSP quantizer output using LSF from previous frame
* @param lsfq [in/out] (2.13) quantized LSF coefficients
* @param past_quantizer_outputs [in/out] (2.13) quantizer outputs from previous frames
* @param ma_predictor_prev MA predictor from previous frame
* @param lsfq_prev (2.13) quantized LSF coefficients from previous frame
*/
static void lsf_restore_from_previous(int16_t* lsfq,
int16_t* past_quantizer_outputs[MA_NP + 1],
int ma_predictor_prev)