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| author | Young Han Lee <cpumaker@gmail.com> | 2011-02-16 10:04:07 +0900 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2011-02-22 02:44:39 +0100 |
| commit | 4f84e728dad84a366a2d183da03b7d92cb20fb23 (patch) | |
| tree | 35c3d8bc6e5805f5df3669456d9715eec0fd3202 /libavcodec/aacdec.c | |
| parent | ad9b2a41b81cc895da99d0d950b12b7299556ef2 (diff) | |
| download | ffmpeg-4f84e728dad84a366a2d183da03b7d92cb20fb23.tar.gz | |
aacdec: Reduce the size of buf_mdct.
It was doubled in size for the LTP implementation. This brings it back
down to its original size.
(cherry picked from commit e22910b21a6c78b0159f98426b10c204f12bc15a)
Diffstat (limited to 'libavcodec/aacdec.c')
| -rw-r--r-- | libavcodec/aacdec.c | 19 |
1 files changed, 11 insertions, 8 deletions
diff --git a/libavcodec/aacdec.c b/libavcodec/aacdec.c index a362d6ad4e..81a94f2fd8 100644 --- a/libavcodec/aacdec.c +++ b/libavcodec/aacdec.c @@ -1763,8 +1763,8 @@ static void apply_ltp(AACContext *ac, SingleChannelElement *sce) int i, sfb; if (sce->ics.window_sequence[0] != EIGHT_SHORT_SEQUENCE) { - float *predTime = ac->buf_mdct; - float *predFreq = sce->ret; + float *predTime = sce->ret; + float *predFreq = ac->buf_mdct; int16_t num_samples = 2048; 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; 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) { memcpy(saved_ltp, saved, 512 * 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) { memcpy(saved_ltp, ac->buf_mdct + 512, 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 - 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)); |