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g723.1: avoid saving/restoring excitation

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Writing the scaled excitation to a scratch buffer (borrowing the
'audio' array) instead of modifying it in place avoids the need
to save and restore the unscaled values.

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2012-08-11 19:59:08 +01:00
parent 4b728b4712
commit 35b533e4de
1 changed files with 11 additions and 16 deletions
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27
libavcodec/g723_1.c
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@ -99,7 +99,7 @@ typedef struct g723_1_context {
int pf_gain;
int postfilter;
int16_t audio[FRAME_LEN + LPC_ORDER];
int16_t audio[FRAME_LEN + LPC_ORDER + PITCH_MAX];
} G723_1_Context;
static av_cold int g723_1_decode_init(AVCodecContext *avctx)
@ -719,7 +719,7 @@ static void comp_ppf_coeff(G723_1_Context *p, int offset, int pitch_lag,
* 4 - backward residual energy
*/
int energy[5] = {0, 0, 0, 0, 0};
int16_t *buf = p->excitation + offset;
int16_t *buf = p->audio + LPC_ORDER + offset;
int fwd_lag = autocorr_max(buf, offset, &energy[1], pitch_lag,
SUBFRAME_LEN, 1);
int back_lag = autocorr_max(buf, offset, &energy[3], pitch_lag,
@ -791,11 +791,12 @@ static int comp_interp_index(G723_1_Context *p, int pitch_lag,
int *exc_eng, int *scale)
{
int offset = PITCH_MAX + 2 * SUBFRAME_LEN;
const int16_t *buf = p->excitation + offset;
int16_t *buf = p->audio + LPC_ORDER;
int index, ccr, tgt_eng, best_eng, temp;
*scale = scale_vector(p->excitation, p->excitation, FRAME_LEN + PITCH_MAX);
*scale = scale_vector(buf, p->excitation, FRAME_LEN + PITCH_MAX);
buf += offset;
/* Compute maximum backward cross-correlation */
ccr = 0;
@ -1008,6 +1009,7 @@ static int g723_1_decode_frame(AVCodecContext *avctx, void *data,
int16_t *vector_ptr;
int16_t *out;
int bad_frame = 0, i, j, ret;
int16_t *audio = p->audio;
if (buf_size < frame_size[dec_mode]) {
if (buf_size)
@ -1071,26 +1073,16 @@ static int g723_1_decode_frame(AVCodecContext *avctx, void *data,
vector_ptr = p->excitation + PITCH_MAX;
/* Save the excitation */
memcpy(p->audio + LPC_ORDER, vector_ptr, FRAME_LEN * sizeof(*p->audio));
p->interp_index = comp_interp_index(p, p->pitch_lag[1],
&p->sid_gain, &p->cur_gain);
/* Peform pitch postfiltering */
if (p->postfilter) {
i = PITCH_MAX;
for (j = 0; j < SUBFRAMES; i += SUBFRAME_LEN, j++)
comp_ppf_coeff(p, i, p->pitch_lag[j >> 1],
ppf + j, p->cur_rate);
}
/* Restore the original excitation */
memcpy(p->excitation, p->prev_excitation,
PITCH_MAX * sizeof(*p->excitation));
memcpy(vector_ptr, p->audio + LPC_ORDER, FRAME_LEN * sizeof(*vector_ptr));
/* Peform pitch postfiltering */
if (p->postfilter)
for (i = 0, j = 0; j < SUBFRAMES; i += SUBFRAME_LEN, j++)
ff_acelp_weighted_vector_sum(p->audio + LPC_ORDER + i,
vector_ptr + i,
@ -1098,6 +1090,9 @@ static int g723_1_decode_frame(AVCodecContext *avctx, void *data,
ppf[j].sc_gain,
ppf[j].opt_gain,
1 << 14, 15, SUBFRAME_LEN);
} else {
audio = vector_ptr - LPC_ORDER;
}
/* Save the excitation for the next frame */
memcpy(p->prev_excitation, p->excitation + FRAME_LEN,
@ -1139,7 +1134,7 @@ static int g723_1_decode_frame(AVCodecContext *avctx, void *data,
memcpy(p->audio, p->synth_mem, LPC_ORDER * sizeof(*p->audio));
for (i = LPC_ORDER, j = 0; j < SUBFRAMES; i += SUBFRAME_LEN, j++)
ff_celp_lp_synthesis_filter(p->audio + i, &lpc[j * LPC_ORDER],
p->audio + i, SUBFRAME_LEN, LPC_ORDER,
audio + i, SUBFRAME_LEN, LPC_ORDER,
0, 1, 1 << 12);
memcpy(p->synth_mem, p->audio + FRAME_LEN, LPC_ORDER * sizeof(*p->audio));