From 9292fe4a1db90c3705d7e6275f3ddb9728b2d363 Mon Sep 17 00:00:00 2001 From: Nathan Caldwell Date: Fri, 23 Dec 2011 17:36:15 -0700 Subject: aacenc: Simplify windowing Signed-off-by: Alex Converse --- libavcodec/aacenc.c | 101 +++++++++++++++++++++++++++++++++++----------------- 1 file changed, 68 insertions(+), 33 deletions(-) (limited to 'libavcodec/aacenc.c') diff --git a/libavcodec/aacenc.c b/libavcodec/aacenc.c index 33e339b545..7607362142 100644 --- a/libavcodec/aacenc.c +++ b/libavcodec/aacenc.c @@ -180,45 +180,80 @@ static void put_audio_specific_config(AVCodecContext *avctx) 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, float *audio) { - int i, k; - 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; + int i; float *output = sce->ret; - if (sce->ics.window_sequence[0] != EIGHT_SHORT_SEQUENCE) { - 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] = 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); - } + apply_window[sce->ics.window_sequence[0]](&s->dsp, sce, audio); + + if (sce->ics.window_sequence[0] != EIGHT_SHORT_SEQUENCE) 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] = 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(audio, audio + 1024, sizeof(audio[0]) * 1024); - } + else + for (i = 0; i < 1024; i += 128) + s->mdct128.mdct_calc(&s->mdct128, sce->coeffs + i, output + i*2); + memcpy(audio, audio + 1024, sizeof(audio[0]) * 1024); } /** -- cgit v1.2.3