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g723_1: save/restore excitation with offset to store LPC history

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The same buffer with saved data is used later in LPC reconstruction, so
it should have some head space for LPC history.
This commit is contained in:
Kostya Shishkov 2012-08-02 07:42:44 +02:00
parent 3680b24351
commit 7f92db14f9
1 changed files with 2 additions and 2 deletions
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4
libavcodec/g723_1.c
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@ -1071,7 +1071,7 @@ static int g723_1_decode_frame(AVCodecContext *avctx, void *data,
vector_ptr = p->excitation + PITCH_MAX;
/* Save the excitation */
memcpy(p->audio, vector_ptr, FRAME_LEN * sizeof(*p->audio));
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);
@ -1086,7 +1086,7 @@ static int g723_1_decode_frame(AVCodecContext *avctx, void *data,
/* Restore the original excitation */
memcpy(p->excitation, p->prev_excitation,
PITCH_MAX * sizeof(*p->excitation));
memcpy(vector_ptr, p->audio, FRAME_LEN * sizeof(*vector_ptr));
memcpy(vector_ptr, p->audio + LPC_ORDER, FRAME_LEN * sizeof(*vector_ptr));
/* Peform pitch postfiltering */
if (p->postfilter)