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Code Issues Releases Activity

aacenc: Enforce LFE bitstream restrictions.

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Originally committed as revision 24099 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Alex Converse 2010-07-07 21:48:51 +00:00
parent 0fd0ef7947
commit 03d5d9b900
1 changed files with 8 additions and 5 deletions
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13
libavcodec/aacenc.c
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@ -209,10 +209,6 @@ static av_cold int aac_encode_init(AVCodecContext *avctx)
ff_aac_tableinit();
if (avctx->channels > 5)
av_log(avctx, AV_LOG_ERROR, "This encoder does not yet enforce the restrictions on LFEs. "
"The output will most likely be an illegal bitstream.\n");
return 0;
}
@ -527,14 +523,21 @@ static int aac_encode_frame(AVCodecContext *avctx,
for (j = 0; j < chans; j++) {
IndividualChannelStream *ics = &cpe->ch[j].ics;
int k;
if (tag == TYPE_LFE) {
wi[j].window_type[0] = ONLY_LONG_SEQUENCE;
wi[j].window_shape = 0;
wi[j].num_windows = 1;
wi[j].grouping[0] = 1;
} else {
wi[j] = ff_psy_suggest_window(&s->psy, samples2, la, start_ch + j, ics->window_sequence[0]);
}
ics->window_sequence[1] = ics->window_sequence[0];
ics->window_sequence[0] = wi[j].window_type[0];
ics->use_kb_window[1] = ics->use_kb_window[0];
ics->use_kb_window[0] = wi[j].window_shape;
ics->num_windows = wi[j].num_windows;
ics->swb_sizes = s->psy.bands [ics->num_windows == 8];
ics->num_swb = s->psy.num_bands[ics->num_windows == 8];
ics->num_swb = tag == TYPE_LFE ? 12 : s->psy.num_bands[ics->num_windows == 8];
for (k = 0; k < ics->num_windows; k++)
ics->group_len[k] = wi[j].grouping[k];