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Change slightly the meaning of RA288Context.phase. This

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allows to remove two intermediary buffers and avoid a few
memcpy's.

Originally committed as revision 14432 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vitor Sessak 2008-07-27 20:35:32 +00:00
parent 9c17037200
commit 3df136d438
1 changed files with 6 additions and 12 deletions
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18
libavcodec/ra288.c
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@ -195,24 +195,18 @@ static void do_hybrid_window(int order, int n, int non_rec, const float *in,
*/
static void backward_filter(RA288Context *ractx)
{
float buffer1[40], temp1[37];
float buffer2[8], temp2[11];
float temp1[37];
float temp2[11];
float st1[37];
float st2[11];
memcpy(buffer1 , ractx->output + 20, 20*sizeof(*buffer1));
memcpy(buffer1 + 20, ractx->output , 20*sizeof(*buffer1));
do_hybrid_window(36, 40, 35, buffer1, temp1, ractx->sp_hist, ractx->sp_rec,
do_hybrid_window(36, 40, 35, ractx->output, temp1, ractx->sp_hist, ractx->sp_rec,
syn_window);
if (!eval_lpc_coeffs(temp1, st1, 36))
colmult(ractx->pr1, st1, syn_bw_tab, 36);
memcpy(buffer2 , ractx->history + 4, 4*sizeof(*buffer2));
memcpy(buffer2 + 4, ractx->history , 4*sizeof(*buffer2));
do_hybrid_window(10, 8, 20, buffer2, temp2, ractx->gain_hist, ractx->gain_rec,
do_hybrid_window(10, 8, 20, ractx->history, temp2, ractx->gain_hist, ractx->gain_rec,
gain_window);
if (!eval_lpc_coeffs(temp2, st2, 10))
@ -241,13 +235,13 @@ static int ra288_decode_frame(AVCodecContext * avctx, void *data,
for (x=0; x < 32; x++) {
float gain = amptable[get_bits(&gb, 3)];
int cb_coef = get_bits(&gb, 6 + (x&1));
ractx->phase = x & 7;
ractx->phase = (x + 4) & 7;
decode(ractx, gain, cb_coef);
for (y=0; y < 5; y++)
*(out++) = 8 * ractx->output[ractx->phase*5 + y];
if (ractx->phase == 3)
if (ractx->phase == 7)
backward_filter(ractx);
}