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| author | Young Han Lee <cpumaker@gmail.com> | 2011-02-16 10:04:07 +0900 |
|---|---|---|
| committer | Alex Converse <alex.converse@gmail.com> | 2011-02-21 16:35:22 -0800 |
| commit | e22910b21a6c78b0159f98426b10c204f12bc15a (patch) | |
| tree | b373a861841ca55974f2fdb273089728cdd8deff | |
| parent | 203df50d1013ea59e558d63f3ea69ffae1249124 (diff) | |
| download | ffmpeg-e22910b21a6c78b0159f98426b10c204f12bc15a.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.
| -rw-r--r-- | libavcodec/aac.h | 2 | ||||
| -rw-r--r-- | libavcodec/aacdec.c | 19 |
2 files changed, 12 insertions, 9 deletions
diff --git a/libavcodec/aac.h b/libavcodec/aac.h index a2bf70b001..73bc40843f 100644 --- a/libavcodec/aac.h +++ b/libavcodec/aac.h @@ -272,7 +272,7 @@ typedef struct { * @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]; /** @} */ /** 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)); |