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opus_celt: normalize using mdct scale

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Removes a per-sample divide in the IIR filter deemphasis filter.

Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>
This commit is contained in:
Rostislav Pehlivanov
2017-07-11 21:30:41 +01:00
parent aef5f9ab05
commit 594cd1f38a
1 changed files with 4 additions and 3 deletions
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7
libavcodec/opus_celt.c
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@@ -907,10 +907,11 @@ int ff_celt_decode_frame(CeltFrame *f, OpusRangeCoder *rc,
/* deemphasis and output scaling */ /* deemphasis and output scaling */
for (j = 0; j < frame_size; j++) { 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; m = tmp * CELT_EMPH_COEFF;
output[i][j] = tmp / 32768.; output[i][j] = tmp;
} }
block->emph_coeff = m; block->emph_coeff = m;
} }
@@ -1006,7 +1007,7 @@ int ff_celt_init(AVCodecContext *avctx, CeltFrame **f, int output_channels)
frm->output_channels = output_channels; frm->output_channels = output_channels;
for (i = 0; i < FF_ARRAY_ELEMS(frm->imdct); i++) 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; goto fail;
if ((ret = ff_celt_pvq_init(&frm->pvq)) < 0) if ((ret = ff_celt_pvq_init(&frm->pvq)) < 0)