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aacenc: Move saved overlap samples to the beginning of the same buffer as incoming samples.

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Signed-off-by: Alex Converse <alex.converse@gmail.com>
This commit is contained in:
Nathan Caldwell 2011-12-24 15:24:16 -07:00 committed by Alex Converse
parent 9b8e2a8709
commit 7946a5acfb
1 changed files with 15 additions and 16 deletions
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31
libavcodec/aacenc.c
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@ -190,36 +190,34 @@ static void apply_window_and_mdct(AACEncContext *s, SingleChannelElement *sce,
float *output = sce->ret;
if (sce->ics.window_sequence[0] != EIGHT_SHORT_SEQUENCE) {
memcpy(output, sce->saved, sizeof(output[0])*1024);
memcpy(output, audio, sizeof(output[0])*1024);
if (sce->ics.window_sequence[0] == LONG_STOP_SEQUENCE) {
memset(output, 0, sizeof(output[0]) * 448);
for (i = 448; i < 576; i++)
output[i] = sce->saved[i] * pwindow[i - 448];
output[i] = audio[i] * pwindow[i - 448];
}
if (sce->ics.window_sequence[0] != LONG_START_SEQUENCE) {
for (i = 0; i < 1024; i++) {
output[i+1024] = audio[i] * lwindow[1024 - i - 1];
sce->saved[i] = audio[i] * lwindow[i];
output[i+1024] = audio[i + 1024] * lwindow[1024 - i - 1];
audio[i] = audio[i + 1024] * lwindow[i];
}
} else {
memcpy(output + 1024, audio, sizeof(output[0]) * 448);
memcpy(output + 1024, audio + 1024, sizeof(output[0]) * 448);
for (; i < 576; i++)
output[i+1024] = audio[i] * swindow[576 - i - 1];
output[i+1024] = audio[i+1024] * swindow[576 - i - 1];
memset(output+1024+576, 0, sizeof(output[0]) * 448);
memcpy(sce->saved, audio, sizeof(sce->saved[0]) * 1024);
memcpy(audio, audio + 1024, sizeof(audio[0]) * 1024);
}
s->mdct1024.mdct_calc(&s->mdct1024, sce->coeffs, output);
} else {
for (k = 0; k < 1024; k += 128) {
for (i = 448 + k; i < 448 + k + 256; i++)
output[i - 448 - k] = (i < 1024)
? sce->saved[i]
: audio[i-1024];
output[i - 448 - k] = audio[i];
s->dsp.vector_fmul (output, output, k ? swindow : pwindow, 128);
s->dsp.vector_fmul_reverse(output+128, output+128, swindow, 128);
s->mdct128.mdct_calc(&s->mdct128, sce->coeffs + k, output);
}
memcpy(sce->saved, audio, sizeof(sce->saved[0]) * 1024);
memcpy(audio, audio + 1024, sizeof(audio[0]) * 1024);
}
}
@ -468,7 +466,7 @@ static int aac_encode_frame(AVCodecContext *avctx,
uint8_t *frame, int buf_size, void *data)
{
AACEncContext *s = avctx->priv_data;
float **samples = s->planar_samples, *samples2, *la;
float **samples = s->planar_samples, *samples2, *la, *overlap;
ChannelElement *cpe;
int i, ch, w, g, chans, tag, start_ch;
int chan_el_counter[4];
@ -495,7 +493,8 @@ static int aac_encode_frame(AVCodecContext *avctx,
for (ch = 0; ch < chans; ch++) {
IndividualChannelStream *ics = &cpe->ch[ch].ics;
int cur_channel = start_ch + ch;
samples2 = &samples[cur_channel][0];
overlap = &samples[cur_channel][0];
samples2 = overlap + 1024;
la = samples2 + (448+64);
if (!data)
la = NULL;
@ -524,7 +523,7 @@ static int aac_encode_frame(AVCodecContext *avctx,
for (w = 0; w < ics->num_windows; w++)
ics->group_len[w] = wi[ch].grouping[w];
apply_window_and_mdct(s, &cpe->ch[ch], samples2);
apply_window_and_mdct(s, &cpe->ch[ch], overlap);
}
start_ch += chans;
}
@ -652,12 +651,12 @@ static av_cold int dsp_init(AVCodecContext *avctx, AACEncContext *s)
static av_cold int alloc_buffers(AVCodecContext *avctx, AACEncContext *s)
{
FF_ALLOCZ_OR_GOTO(avctx, s->buffer.samples, 2 * 1024 * s->channels * sizeof(s->buffer.samples[0]), alloc_fail);
FF_ALLOCZ_OR_GOTO(avctx, s->buffer.samples, 3 * 1024 * s->channels * sizeof(s->buffer.samples[0]), alloc_fail);
FF_ALLOCZ_OR_GOTO(avctx, s->cpe, sizeof(ChannelElement) * s->chan_map[0], alloc_fail);
FF_ALLOCZ_OR_GOTO(avctx, avctx->extradata, 5 + FF_INPUT_BUFFER_PADDING_SIZE, alloc_fail);
for(int ch = 0; ch < s->channels; ch++)
s->planar_samples[ch] = s->buffer.samples + 2 * 1024 * ch;
s->planar_samples[ch] = s->buffer.samples + 3 * 1024 * ch;
return 0;
alloc_fail: