diff options
Diffstat (limited to 'media/libopus/silk/fixed/encode_frame_FIX.c')
| -rw-r--r-- | media/libopus/silk/fixed/encode_frame_FIX.c | 18 |
1 files changed, 7 insertions, 11 deletions
diff --git a/media/libopus/silk/fixed/encode_frame_FIX.c b/media/libopus/silk/fixed/encode_frame_FIX.c index a02bf87dbb..7c83360ba3 100644 --- a/media/libopus/silk/fixed/encode_frame_FIX.c +++ b/media/libopus/silk/fixed/encode_frame_FIX.c @@ -105,8 +105,11 @@ opus_int silk_encode_frame_FIX( opus_int gain_lock[ MAX_NB_SUBFR ] = {0}; opus_int16 best_gain_mult[ MAX_NB_SUBFR ]; opus_int best_sum[ MAX_NB_SUBFR ]; + opus_int bits_margin; SAVE_STACK; + /* For CBR, 5 bits below budget is close enough. For VBR, allow up to 25% below the cap if we initially busted the budget. */ + bits_margin = useCBR ? 5 : maxBits/4; /* This is totally unnecessary but many compilers (including gcc) are too dumb to realise it */ LastGainIndex_copy2 = nBits_lower = nBits_upper = gainMult_lower = gainMult_upper = 0; @@ -282,7 +285,7 @@ opus_int silk_encode_frame_FIX( gainMult_upper = gainMult_Q8; gainsID_upper = gainsID; } - } else if( nBits < maxBits - 5 ) { + } else if( nBits < maxBits - bits_margin ) { found_lower = 1; nBits_lower = nBits; gainMult_lower = gainMult_Q8; @@ -296,7 +299,7 @@ opus_int silk_encode_frame_FIX( LastGainIndex_copy2 = psEnc->sShape.LastGainIndex; } } else { - /* Within 5 bits of budget: close enough */ + /* Close enough */ break; } @@ -318,17 +321,10 @@ opus_int silk_encode_frame_FIX( if( ( found_lower & found_upper ) == 0 ) { /* Adjust gain according to high-rate rate/distortion curve */ if( nBits > maxBits ) { - if (gainMult_Q8 < 16384) { - gainMult_Q8 *= 2; - } else { - gainMult_Q8 = 32767; - } + gainMult_Q8 = silk_min_32( 1024, gainMult_Q8*3/2 ); } else { - opus_int32 gain_factor_Q16; - gain_factor_Q16 = silk_log2lin( silk_LSHIFT( nBits - maxBits, 7 ) / psEnc->sCmn.frame_length + SILK_FIX_CONST( 16, 7 ) ); - gainMult_Q8 = silk_SMULWB( gain_factor_Q16, gainMult_Q8 ); + gainMult_Q8 = silk_max_32( 64, gainMult_Q8*4/5 ); } - } else { /* Adjust gain by interpolating */ gainMult_Q8 = gainMult_lower + silk_DIV32_16( silk_MUL( gainMult_upper - gainMult_lower, maxBits - nBits_lower ), nBits_upper - nBits_lower ); |