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aacenc: Simplify windowing

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Signed-off-by: Alex Converse <alex.converse@gmail.com>
This commit is contained in:
Nathan Caldwell 2011-12-23 17:36:15 -07:00 committed by Alex Converse
parent 7946a5acfb
commit 9292fe4a1d
1 changed files with 68 additions and 33 deletions
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101
libavcodec/aacenc.c
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@ -180,45 +180,80 @@ static void put_audio_specific_config(AVCodecContext *avctx)
flush_put_bits(&pb); flush_put_bits(&pb);
} }
#define WINDOW_FUNC(type) \
static void apply_ ##type ##_window(DSPContext *dsp, SingleChannelElement *sce, const float *audio)
WINDOW_FUNC(only_long)
{
const float *lwindow = sce->ics.use_kb_window[0] ? ff_aac_kbd_long_1024 : ff_sine_1024;
const float *pwindow = sce->ics.use_kb_window[1] ? ff_aac_kbd_long_1024 : ff_sine_1024;
float *out = sce->ret;
dsp->vector_fmul (out, audio, lwindow, 1024);
dsp->vector_fmul_reverse(out + 1024, audio + 1024, pwindow, 1024);
}
WINDOW_FUNC(long_start)
{
const float *lwindow = sce->ics.use_kb_window[1] ? ff_aac_kbd_long_1024 : ff_sine_1024;
const float *swindow = sce->ics.use_kb_window[0] ? ff_aac_kbd_short_128 : ff_sine_128;
float *out = sce->ret;
dsp->vector_fmul(out, audio, lwindow, 1024);
memcpy(out + 1024, audio, sizeof(out[0]) * 448);
dsp->vector_fmul_reverse(out + 1024 + 448, audio, swindow, 128);
memset(out + 1024 + 576, 0, sizeof(out[0]) * 448);
}
WINDOW_FUNC(long_stop)
{
const float *lwindow = sce->ics.use_kb_window[0] ? ff_aac_kbd_long_1024 : ff_sine_1024;
const float *swindow = sce->ics.use_kb_window[1] ? ff_aac_kbd_short_128 : ff_sine_128;
float *out = sce->ret;
memset(out, 0, sizeof(out[0]) * 448);
dsp->vector_fmul(out + 448, audio + 448, swindow, 128);
memcpy(out + 576, audio + 576, sizeof(out[0]) * 448);
dsp->vector_fmul_reverse(out + 1024, audio + 1024, lwindow, 1024);
}
WINDOW_FUNC(eight_short)
{
const float *swindow = sce->ics.use_kb_window[0] ? ff_aac_kbd_short_128 : ff_sine_128;
const float *pwindow = sce->ics.use_kb_window[1] ? ff_aac_kbd_short_128 : ff_sine_128;
const float *in = audio + 448;
float *out = sce->ret;
for (int w = 0; w < 8; w++) {
dsp->vector_fmul (out, in, w ? pwindow : swindow, 128);
out += 128;
in += 128;
dsp->vector_fmul_reverse(out, in, swindow, 128);
out += 128;
}
}
static void (*const apply_window[4])(DSPContext *dsp, SingleChannelElement *sce, const float *audio) = {
[ONLY_LONG_SEQUENCE] = apply_only_long_window,
[LONG_START_SEQUENCE] = apply_long_start_window,
[EIGHT_SHORT_SEQUENCE] = apply_eight_short_window,
[LONG_STOP_SEQUENCE] = apply_long_stop_window
};
static void apply_window_and_mdct(AACEncContext *s, SingleChannelElement *sce, static void apply_window_and_mdct(AACEncContext *s, SingleChannelElement *sce,
float *audio) float *audio)
{ {
int i, k; int i;
const float * lwindow = sce->ics.use_kb_window[0] ? ff_aac_kbd_long_1024 : ff_sine_1024;
const float * swindow = sce->ics.use_kb_window[0] ? ff_aac_kbd_short_128 : ff_sine_128;
const float * pwindow = sce->ics.use_kb_window[1] ? ff_aac_kbd_short_128 : ff_sine_128;
float *output = sce->ret; float *output = sce->ret;
if (sce->ics.window_sequence[0] != EIGHT_SHORT_SEQUENCE) { apply_window[sce->ics.window_sequence[0]](&s->dsp, sce, audio);
memcpy(output, audio, sizeof(output[0])*1024);
if (sce->ics.window_sequence[0] == LONG_STOP_SEQUENCE) { if (sce->ics.window_sequence[0] != EIGHT_SHORT_SEQUENCE)
memset(output, 0, sizeof(output[0]) * 448);
for (i = 448; i < 576; i++)
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 + 1024] * lwindow[1024 - i - 1];
audio[i] = audio[i + 1024] * lwindow[i];
}
} else {
memcpy(output + 1024, audio + 1024, sizeof(output[0]) * 448);
for (; i < 576; i++)
output[i+1024] = audio[i+1024] * swindow[576 - i - 1];
memset(output+1024+576, 0, sizeof(output[0]) * 448);
memcpy(audio, audio + 1024, sizeof(audio[0]) * 1024);
}
s->mdct1024.mdct_calc(&s->mdct1024, sce->coeffs, output); s->mdct1024.mdct_calc(&s->mdct1024, sce->coeffs, output);
} else { else
for (k = 0; k < 1024; k += 128) { for (i = 0; i < 1024; i += 128)
for (i = 448 + k; i < 448 + k + 256; i++) s->mdct128.mdct_calc(&s->mdct128, sce->coeffs + i, output + i*2);
output[i - 448 - k] = audio[i]; memcpy(audio, audio + 1024, sizeof(audio[0]) * 1024);
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(audio, audio + 1024, sizeof(audio[0]) * 1024);
}
} }
/** /**