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| author | Jai Luthra <me@jailuthra.in> | 2016-08-23 02:32:04 +0530 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2016-08-28 11:18:16 +0200 |
| commit | 0c023d181e581a0299d96a5edf7a736bdc66dc43 (patch) | |
| tree | f990de96906d8b42e527017c911e5d355b73c489 /libavcodec/lpc.c | |
| parent | 88bcdf109a449d302bec977997af83e1462bca6c (diff) | |
| download | ffmpeg-streaming-0c023d181e581a0299d96a5edf7a736bdc66dc43.zip ffmpeg-streaming-0c023d181e581a0299d96a5edf7a736bdc66dc43.tar.gz | |
lavc/lpc: Add min_shift parameter in LPC
The min_shift parameter is needed by the MLP encoder
Signed-off-by: Jai Luthra <me@jailuthra.in>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavcodec/lpc.c')
| -rw-r--r-- | libavcodec/lpc.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/libavcodec/lpc.c b/libavcodec/lpc.c index 052aeaa..f8da1e1 100644 --- a/libavcodec/lpc.c +++ b/libavcodec/lpc.c @@ -93,7 +93,8 @@ static void lpc_compute_autocorr_c(const double *data, int len, int lag, * Quantize LPC coefficients */ static void quantize_lpc_coefs(double *lpc_in, int order, int precision, - int32_t *lpc_out, int *shift, int max_shift, int zero_shift) + int32_t *lpc_out, int *shift, int min_shift, + int max_shift, int zero_shift) { int i; double cmax, error; @@ -118,7 +119,7 @@ static void quantize_lpc_coefs(double *lpc_in, int order, int precision, /* calculate level shift which scales max coeff to available bits */ sh = max_shift; - while((cmax * (1 << sh) > qmax) && (sh > 0)) { + while((cmax * (1 << sh) > qmax) && (sh > min_shift)) { sh--; } @@ -201,7 +202,7 @@ int ff_lpc_calc_coefs(LPCContext *s, int max_order, int precision, int32_t coefs[][MAX_LPC_ORDER], int *shift, enum FFLPCType lpc_type, int lpc_passes, - int omethod, int max_shift, int zero_shift) + int omethod, int min_shift, int max_shift, int zero_shift) { double autoc[MAX_LPC_ORDER+1]; double ref[MAX_LPC_ORDER] = { 0 }; @@ -284,10 +285,12 @@ int ff_lpc_calc_coefs(LPCContext *s, if(omethod == ORDER_METHOD_EST) { opt_order = estimate_best_order(ref, min_order, max_order); i = opt_order-1; - quantize_lpc_coefs(lpc[i], i+1, precision, coefs[i], &shift[i], max_shift, zero_shift); + quantize_lpc_coefs(lpc[i], i+1, precision, coefs[i], &shift[i], + min_shift, max_shift, zero_shift); } else { for(i=min_order-1; i<max_order; i++) { - quantize_lpc_coefs(lpc[i], i+1, precision, coefs[i], &shift[i], max_shift, zero_shift); + quantize_lpc_coefs(lpc[i], i+1, precision, coefs[i], &shift[i], + min_shift, max_shift, zero_shift); } } |
