virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-11-21 10:55:51 +02:00
Code Issues Releases Activity

aacdec: dsputilize the scalar multiplication in intensity stereo

Browse Source
This commit is contained in:
Young Han Lee 2011-02-19 09:32:24 +09:00 committed by Alex Converse
parent 902685b8ab
commit 9707f84fa7
1 changed files with 7 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
libavcodec/aacdec.c
View File

@ -1386,13 +1386,13 @@ static void apply_mid_side_stereo(AACContext *ac, ChannelElement *cpe)
* [1] mask is decoded from bitstream; [2] mask is all 1s;
* [3] reserved for scalable AAC
*/
static void apply_intensity_stereo(ChannelElement *cpe, int ms_present)
static void apply_intensity_stereo(AACContext *ac, ChannelElement *cpe, int ms_present)
{
const IndividualChannelStream *ics = &cpe->ch[1].ics;
SingleChannelElement *sce1 = &cpe->ch[1];
float *coef0 = cpe->ch[0].coeffs, *coef1 = cpe->ch[1].coeffs;
const uint16_t *offsets = ics->swb_offset;
int g, group, i, k, idx = 0;
int g, group, i, idx = 0;
int c;
float scale;
for (g = 0; g < ics->num_window_groups; g++) {
@ -1405,8 +1405,10 @@ static void apply_intensity_stereo(ChannelElement *cpe, int ms_present)
c *= 1 - 2 * cpe->ms_mask[idx];
scale = c * sce1->sf[idx];
for (group = 0; group < ics->group_len[g]; group++)
for (k = offsets[i]; k < offsets[i + 1]; k++)
coef1[group * 128 + k] = scale * coef0[group * 128 + k];
ac->dsp.vector_fmul_scalar(coef1 + group * 128 + offsets[i],
coef0 + group * 128 + offsets[i],
scale,
offsets[i + 1] - offsets[i]);
}
} else {
int bt_run_end = sce1->band_type_run_end[idx];
@ -1459,7 +1461,7 @@ static int decode_cpe(AACContext *ac, GetBitContext *gb, ChannelElement *cpe)
}
}
apply_intensity_stereo(cpe, ms_present);
apply_intensity_stereo(ac, cpe, ms_present);
return 0;
}