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Makes SILK surround masking a bit more aggressive in both directions

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This also splits the rate adjustment between SILK and CELT (previous
code only changed SILK)
This commit is contained in:
Jean-Marc Valin 2013-11-25 01:52:08 -05:00
parent a47d6f308f
commit 93e1096093
1 changed files with 8 additions and 4 deletions
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12
src/opus_encoder.c
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@ -1513,18 +1513,22 @@ opus_int32 opus_encode_native(OpusEncoder *st, const opus_val16 *pcm, int frame_
{
opus_val16 mask;
mask = MAX16(MIN16(st->energy_masking[21*c+i],
QCONST16(.25f, DB_SHIFT)), -QCONST16(2.0f, DB_SHIFT));
QCONST16(.5f, DB_SHIFT)), -QCONST16(2.0f, DB_SHIFT));
if (mask > 0)
mask = HALF16(mask);
mask_sum += mask;
}
}
/* Conservative rate reduction, we cut the masking in half */
masking_depth = HALF16(mask_sum / end*st->channels);
masking_depth += QCONST16(.1f, DB_SHIFT);
masking_depth = mask_sum / end*st->channels;
masking_depth += QCONST16(.2f, DB_SHIFT);
rate_offset = (opus_int32)PSHR32(MULT16_16(srate, masking_depth), DB_SHIFT);
rate_offset = MAX32(rate_offset, -2*st->silk_mode.bitRate/3);
st->silk_mode.bitRate += rate_offset;
/* Split the rate change between the SILK and CELT part for hybrid. */
if (st->bandwidth==OPUS_BANDWIDTH_SUPERWIDEBAND || st->bandwidth==OPUS_BANDWIDTH_FULLBAND)
st->silk_mode.bitRate += 3*rate_offset/5;
else
st->silk_mode.bitRate += rate_offset;
bytes_target += rate_offset * frame_size / (8 * st->Fs);
}