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Add a shift parameter to celp_lp_synthesis_filter()

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This is intended for reuse by the G.723.1 decoder

Signed-off-by: Kostya Shishkov <kostya.shishkov@gmail.com>
This commit is contained in:
Mohamed Naufal Basheer 2012-07-10 19:58:39 +02:00 committed by Kostya Shishkov
parent 51a5ddfa01
commit 8aac5585fa
3 changed files with 5 additions and 4 deletions
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4
libavcodec/celp_filters.c
View File

@ -58,7 +58,7 @@ void ff_celp_circ_addf(float *out, const float *in,
int ff_celp_lp_synthesis_filter(int16_t *out, const int16_t *filter_coeffs,
const int16_t *in, int buffer_length,
int filter_length, int stop_on_overflow,
int rounder)
int shift, int rounder)
{
int i,n;
@ -67,7 +67,7 @@ int ff_celp_lp_synthesis_filter(int16_t *out, const int16_t *filter_coeffs,
for (i = 1; i <= filter_length; i++)
sum -= filter_coeffs[i-1] * out[n-i];
sum = (sum >> 12) + in[n];
sum = ((sum >> 12) + in[n]) >> shift;
if (sum + 0x8000 > 0xFFFFU) {
if (stop_on_overflow)

3
libavcodec/celp_filters.h
View File

@ -63,6 +63,7 @@ void ff_celp_circ_addf(float *out, const float *in,
* @param filter_length filter length (10 for 10th order LP filter)
* @param stop_on_overflow 1 - return immediately if overflow occurs
* 0 - ignore overflows
* @param shift the result is shifted right by this value
* @param rounder the amount to add for rounding (usually 0x800 or 0xfff)
*
* @return 1 if overflow occurred, 0 - otherwise
@ -75,7 +76,7 @@ void ff_celp_circ_addf(float *out, const float *in,
int ff_celp_lp_synthesis_filter(int16_t *out, const int16_t *filter_coeffs,
const int16_t *in, int buffer_length,
int filter_length, int stop_on_overflow,
int rounder);
int shift, int rounder);
/**
* LP synthesis filter.

2
libavcodec/ra144.c
View File

@ -1715,6 +1715,6 @@ void ff_subblock_synthesis(RA144Context *ractx, const uint16_t *lpc_coefs,
LPC_ORDER*sizeof(*ractx->curr_sblock));
if (ff_celp_lp_synthesis_filter(ractx->curr_sblock + LPC_ORDER, lpc_coefs,
block, BLOCKSIZE, LPC_ORDER, 1, 0xfff))
block, BLOCKSIZE, LPC_ORDER, 1, 0, 0xfff))
memset(ractx->curr_sblock, 0, (LPC_ORDER+BLOCKSIZE)*sizeof(*ractx->curr_sblock));
}