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use limited range of lpc orders when quantizing coefficients 

Originally committed as revision 14794 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Justin Ruggles 2008-08-16 21:24:06 +00:00
parent e748e34dd6
commit 56c07e2989
3 changed files with 4 additions and 4 deletions
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2
libavcodec/flacenc.c
View File

@ -855,7 +855,7 @@ static int encode_residual(FlacEncodeContext *ctx, int ch)
}
/* LPC */
opt_order = ff_lpc_calc_coefs(&ctx->dsp, smp, n, max_order, precision, coefs,
opt_order = ff_lpc_calc_coefs(&ctx->dsp, smp, n, min_order, max_order, precision, coefs,
shift, ctx->options.use_lpc, omethod, MAX_LPC_SHIFT, 0);
if(omethod == ORDER_METHOD_2LEVEL ||

4
libavcodec/lpc.c
View File

@ -135,7 +135,7 @@ static int estimate_best_order(double *ref, int max_order)
* Calculate LPC coefficients for multiple orders
*/
int ff_lpc_calc_coefs(DSPContext *s,
const int32_t *samples, int blocksize, int max_order,
const int32_t *samples, int blocksize, int min_order, int max_order,
int precision, int32_t coefs[][MAX_LPC_ORDER],
int *shift, int use_lpc, int omethod, int max_shift, int zero_shift)
{
@ -195,7 +195,7 @@ int ff_lpc_calc_coefs(DSPContext *s,
i = opt_order-1;
quantize_lpc_coefs(lpc[i], i+1, precision, coefs[i], &shift[i], max_shift, zero_shift);
} else {
for(i=0; i<max_order; i++) {
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);
}
}

2
libavcodec/lpc.h
View File

@ -39,7 +39,7 @@
* Calculate LPC coefficients for multiple orders
*/
int ff_lpc_calc_coefs(DSPContext *s,
const int32_t *samples, int blocksize, int max_order,
const int32_t *samples, int blocksize, int min_order, int max_order,
int precision, int32_t coefs[][MAX_LPC_ORDER],
int *shift, int use_lpc, int omethod, int max_shift, int zero_shift);