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aacdec: Reduce the size of buf_mdct.

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It was doubled in size for the LTP implementation. This brings it back
down to its original size.
(cherry picked from commit e22910b21a)
oldabi
Young Han Lee 14 years ago committed by Michael Niedermayer
parent ad9b2a41b8
commit 4f84e728da
2 changed files with 12 additions and 9 deletions
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  1. 2
      libavcodec/aac.h
  2. 19
      libavcodec/aacdec.c

2
libavcodec/aac.h
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@ -272,7 +272,7 @@ typedef struct {
* @defgroup temporary aligned temporary buffers (We do not want to have these on the stack.) * @defgroup temporary aligned temporary buffers (We do not want to have these on the stack.)
* @{ * @{
*/ */
DECLARE_ALIGNED(16, float, buf_mdct)[2048]; DECLARE_ALIGNED(16, float, buf_mdct)[1024];
/** @} */ /** @} */
/** /**

19
libavcodec/aacdec.c
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@ -1763,8 +1763,8 @@ static void apply_ltp(AACContext *ac, SingleChannelElement *sce)
int i, sfb; int i, sfb;
if (sce->ics.window_sequence[0] != EIGHT_SHORT_SEQUENCE) { if (sce->ics.window_sequence[0] != EIGHT_SHORT_SEQUENCE) {
float *predTime = ac->buf_mdct; float *predTime = sce->ret;
float *predFreq = sce->ret; float *predFreq = ac->buf_mdct;
int16_t num_samples = 2048; int16_t num_samples = 2048;
if (ltp->lag < 1024) if (ltp->lag < 1024)
@ -1797,19 +1797,22 @@ static void update_ltp(AACContext *ac, SingleChannelElement *sce)
const float *swindow = ics->use_kb_window[0] ? ff_aac_kbd_short_128 : ff_sine_128; const float *swindow = ics->use_kb_window[0] ? ff_aac_kbd_short_128 : ff_sine_128;
int i; int i;
for (i = 0; i < 512; i++)
ac->buf_mdct[1535 - i] = ac->buf_mdct[512 + i];
if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) { if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
memcpy(saved_ltp, saved, 512 * sizeof(float)); memcpy(saved_ltp, saved, 512 * sizeof(float));
memset(saved_ltp + 576, 0, 448 * sizeof(float)); memset(saved_ltp + 576, 0, 448 * sizeof(float));
ac->dsp.vector_fmul_reverse(saved_ltp + 448, ac->buf_mdct + 960, swindow, 128); ac->dsp.vector_fmul_reverse(saved_ltp + 448, ac->buf_mdct + 960, &swindow[64], 64);
for (i = 0; i < 64; i++)
saved_ltp[i + 512] = ac->buf_mdct[1023 - i] * swindow[63 - i];
} else if (ics->window_sequence[0] == LONG_START_SEQUENCE) { } else if (ics->window_sequence[0] == LONG_START_SEQUENCE) {
memcpy(saved_ltp, ac->buf_mdct + 512, 448 * sizeof(float)); memcpy(saved_ltp, ac->buf_mdct + 512, 448 * sizeof(float));
memset(saved_ltp + 576, 0, 448 * sizeof(float)); memset(saved_ltp + 576, 0, 448 * sizeof(float));
ac->dsp.vector_fmul_reverse(saved_ltp + 448, ac->buf_mdct + 960, swindow, 128); ac->dsp.vector_fmul_reverse(saved_ltp + 448, ac->buf_mdct + 960, &swindow[64], 64);
for (i = 0; i < 64; i++)
saved_ltp[i + 512] = ac->buf_mdct[1023 - i] * swindow[63 - i];
} else { // LONG_STOP or ONLY_LONG } else { // LONG_STOP or ONLY_LONG
ac->dsp.vector_fmul_reverse(saved_ltp, ac->buf_mdct + 512, lwindow, 1024); ac->dsp.vector_fmul_reverse(saved_ltp, ac->buf_mdct + 512, &lwindow[512], 512);
for (i = 0; i < 512; i++)
saved_ltp[i + 512] = ac->buf_mdct[1023 - i] * lwindow[511 - i];
} }
memcpy(sce->ltp_state, &sce->ltp_state[1024], 1024 * sizeof(int16_t)); memcpy(sce->ltp_state, &sce->ltp_state[1024], 1024 * sizeof(int16_t));

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