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| author | Rostislav Pehlivanov <atomnuker@gmail.com> | 2017-07-11 21:30:41 +0100 |
|---|---|---|
| committer | Rostislav Pehlivanov <atomnuker@gmail.com> | 2017-07-11 21:36:48 +0100 |
| commit | 594cd1f38a7bbd15fb25529701000ef0b5d1ac12 (patch) | |
| tree | 77d338f1be09e9a7948d210597b5775ac6c39a05 /libavcodec | |
| parent | aef5f9ab05c3acad2cc5d141686a76c974c8927b (diff) | |
| download | ffmpeg-594cd1f38a7bbd15fb25529701000ef0b5d1ac12.tar.gz | |
opus_celt: normalize using mdct scale
Removes a per-sample divide in the IIR filter deemphasis filter.
Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>
Diffstat (limited to 'libavcodec')
| -rw-r--r-- | libavcodec/opus_celt.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/libavcodec/opus_celt.c b/libavcodec/opus_celt.c index 13bfe986be..0177b123b1 100644 --- a/libavcodec/opus_celt.c +++ b/libavcodec/opus_celt.c @@ -907,10 +907,11 @@ int ff_celt_decode_frame(CeltFrame *f, OpusRangeCoder *rc, /* deemphasis and output scaling */ for (j = 0; j < frame_size; j++) { - float tmp = block->buf[1024 - frame_size + j] + m; + const float tmp = block->buf[1024 - frame_size + j] + m; m = tmp * CELT_EMPH_COEFF; - output[i][j] = tmp / 32768.; + output[i][j] = tmp; } + block->emph_coeff = m; } @@ -1006,7 +1007,7 @@ int ff_celt_init(AVCodecContext *avctx, CeltFrame **f, int output_channels) frm->output_channels = output_channels; for (i = 0; i < FF_ARRAY_ELEMS(frm->imdct); i++) - if ((ret = ff_mdct15_init(&frm->imdct[i], 1, i + 3, -1.0f)) < 0) + if ((ret = ff_mdct15_init(&frm->imdct[i], 1, i + 3, -1.0f/32768)) < 0) goto fail; if ((ret = ff_celt_pvq_init(&frm->pvq)) < 0) |