| /* replaygain_synthesis - Routines for applying ReplayGain to a signal |
| * Copyright (C) 2002-2009 Josh Coalson |
| * Copyright (C) 2011-2016 Xiph.Org Foundation |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| /* |
| * This is an aggregation of pieces of code from John Edwards' WaveGain |
| * program. Mostly cosmetic changes were made; otherwise, the dithering |
| * code is almost untouched and the gain processing was converted from |
| * processing a whole file to processing chunks of samples. |
| * |
| * The original copyright notices for WaveGain's dither.c and wavegain.c |
| * appear below: |
| */ |
| /* |
| * (c) 2002 John Edwards |
| * mostly lifted from work by Frank Klemm |
| * random functions for dithering. |
| */ |
| /* |
| * Copyright (C) 2002 John Edwards |
| * Additional code by Magnus Holmgren and Gian-Carlo Pascutto |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| # include <config.h> |
| #endif |
| |
| #include <string.h> /* for memset() */ |
| #include <math.h> |
| #include "share/replaygain_synthesis.h" |
| #include "FLAC/assert.h" |
| |
| #define FLAC__I64L(x) x##LL |
| |
| |
| /* |
| * the following is based on parts of dither.c |
| */ |
| |
| |
| /* |
| * This is a simple random number generator with good quality for audio purposes. |
| * It consists of two polycounters with opposite rotation direction and different |
| * periods. The periods are coprime, so the total period is the product of both. |
| * |
| * ------------------------------------------------------------------------------------------------- |
| * +-> |31:30:29:28:27:26:25:24:23:22:21:20:19:18:17:16:15:14:13:12:11:10: 9: 8: 7: 6: 5: 4: 3: 2: 1: 0| |
| * | ------------------------------------------------------------------------------------------------- |
| * | | | | | | | |
| * | +--+--+--+-XOR-+--------+ |
| * | | |
| * +--------------------------------------------------------------------------------------+ |
| * |
| * ------------------------------------------------------------------------------------------------- |
| * |31:30:29:28:27:26:25:24:23:22:21:20:19:18:17:16:15:14:13:12:11:10: 9: 8: 7: 6: 5: 4: 3: 2: 1: 0| <-+ |
| * ------------------------------------------------------------------------------------------------- | |
| * | | | | | |
| * +--+----XOR----+--+ | |
| * | | |
| * +----------------------------------------------------------------------------------------+ |
| * |
| * |
| * The first has an period of 3*5*17*257*65537, the second of 7*47*73*178481, |
| * which gives a period of 18.410.713.077.675.721.215. The result is the |
| * XORed values of both generators. |
| */ |
| |
| static unsigned int random_int_(void) |
| { |
| static const unsigned char parity_[256] = { |
| 0,1,1,0,1,0,0,1,1,0,0,1,0,1,1,0,1,0,0,1,0,1,1,0,0,1,1,0,1,0,0,1, |
| 1,0,0,1,0,1,1,0,0,1,1,0,1,0,0,1,0,1,1,0,1,0,0,1,1,0,0,1,0,1,1,0, |
| 1,0,0,1,0,1,1,0,0,1,1,0,1,0,0,1,0,1,1,0,1,0,0,1,1,0,0,1,0,1,1,0, |
| 0,1,1,0,1,0,0,1,1,0,0,1,0,1,1,0,1,0,0,1,0,1,1,0,0,1,1,0,1,0,0,1, |
| 1,0,0,1,0,1,1,0,0,1,1,0,1,0,0,1,0,1,1,0,1,0,0,1,1,0,0,1,0,1,1,0, |
| 0,1,1,0,1,0,0,1,1,0,0,1,0,1,1,0,1,0,0,1,0,1,1,0,0,1,1,0,1,0,0,1, |
| 0,1,1,0,1,0,0,1,1,0,0,1,0,1,1,0,1,0,0,1,0,1,1,0,0,1,1,0,1,0,0,1, |
| 1,0,0,1,0,1,1,0,0,1,1,0,1,0,0,1,0,1,1,0,1,0,0,1,1,0,0,1,0,1,1,0 |
| }; |
| static unsigned int r1_ = 1; |
| static unsigned int r2_ = 1; |
| |
| unsigned int t1, t2, t3, t4; |
| |
| /* Parity calculation is done via table lookup, this is also available |
| * on CPUs without parity, can be implemented in C and avoid unpredictable |
| * jumps and slow rotate through the carry flag operations. |
| */ |
| t3 = t1 = r1_; t4 = t2 = r2_; |
| t1 &= 0xF5; t2 >>= 25; |
| t1 = parity_[t1]; t2 &= 0x63; |
| t1 <<= 31; t2 = parity_[t2]; |
| |
| return (r1_ = (t3 >> 1) | t1 ) ^ (r2_ = (t4 + t4) | t2 ); |
| } |
| |
| /* gives a equal distributed random number */ |
| /* between -2^31*mult and +2^31*mult */ |
| static double random_equi_(double mult) |
| { |
| return mult * (int) random_int_(); |
| } |
| |
| /* gives a triangular distributed random number */ |
| /* between -2^32*mult and +2^32*mult */ |
| static double random_triangular_(double mult) |
| { |
| return mult * ( (double) (int) random_int_() + (double) (int) random_int_() ); |
| } |
| |
| |
| static const float F44_0 [16 + 32] = { |
| (float)0, (float)0, (float)0, (float)0, (float)0, (float)0, (float)0, (float)0, |
| (float)0, (float)0, (float)0, (float)0, (float)0, (float)0, (float)0, (float)0, |
| |
| (float)0, (float)0, (float)0, (float)0, (float)0, (float)0, (float)0, (float)0, |
| (float)0, (float)0, (float)0, (float)0, (float)0, (float)0, (float)0, (float)0, |
| |
| (float)0, (float)0, (float)0, (float)0, (float)0, (float)0, (float)0, (float)0, |
| (float)0, (float)0, (float)0, (float)0, (float)0, (float)0, (float)0, (float)0 |
| }; |
| |
| |
| static const float F44_1 [16 + 32] = { /* SNR(w) = 4.843163 dB, SNR = -3.192134 dB */ |
| (float) 0.85018292704024355931, (float) 0.29089597350995344721, (float)-0.05021866022121039450, (float)-0.23545456294599161833, |
| (float)-0.58362726442227032096, (float)-0.67038978965193036429, (float)-0.38566861572833459221, (float)-0.15218663390367969967, |
| (float)-0.02577543084864530676, (float) 0.14119295297688728127, (float) 0.22398848581628781612, (float) 0.15401727203382084116, |
| (float) 0.05216161232906000929, (float)-0.00282237820999675451, (float)-0.03042794608323867363, (float)-0.03109780942998826024, |
| |
| (float) 0.85018292704024355931, (float) 0.29089597350995344721, (float)-0.05021866022121039450, (float)-0.23545456294599161833, |
| (float)-0.58362726442227032096, (float)-0.67038978965193036429, (float)-0.38566861572833459221, (float)-0.15218663390367969967, |
| (float)-0.02577543084864530676, (float) 0.14119295297688728127, (float) 0.22398848581628781612, (float) 0.15401727203382084116, |
| (float) 0.05216161232906000929, (float)-0.00282237820999675451, (float)-0.03042794608323867363, (float)-0.03109780942998826024, |
| |
| (float) 0.85018292704024355931, (float) 0.29089597350995344721, (float)-0.05021866022121039450, (float)-0.23545456294599161833, |
| (float)-0.58362726442227032096, (float)-0.67038978965193036429, (float)-0.38566861572833459221, (float)-0.15218663390367969967, |
| (float)-0.02577543084864530676, (float) 0.14119295297688728127, (float) 0.22398848581628781612, (float) 0.15401727203382084116, |
| (float) 0.05216161232906000929, (float)-0.00282237820999675451, (float)-0.03042794608323867363, (float)-0.03109780942998826024, |
| }; |
| |
| |
| static const float F44_2 [16 + 32] = { /* SNR(w) = 10.060213 dB, SNR = -12.766730 dB */ |
| (float) 1.78827593892108555290, (float) 0.95508210637394326553, (float)-0.18447626783899924429, (float)-0.44198126506275016437, |
| (float)-0.88404052492547413497, (float)-1.42218907262407452967, (float)-1.02037566838362314995, (float)-0.34861755756425577264, |
| (float)-0.11490230170431934434, (float) 0.12498899339968611803, (float) 0.38065885268563131927, (float) 0.31883491321310506562, |
| (float) 0.10486838686563442765, (float)-0.03105361685110374845, (float)-0.06450524884075370758, (float)-0.02939198261121969816, |
| |
| (float) 1.78827593892108555290, (float) 0.95508210637394326553, (float)-0.18447626783899924429, (float)-0.44198126506275016437, |
| (float)-0.88404052492547413497, (float)-1.42218907262407452967, (float)-1.02037566838362314995, (float)-0.34861755756425577264, |
| (float)-0.11490230170431934434, (float) 0.12498899339968611803, (float) 0.38065885268563131927, (float) 0.31883491321310506562, |
| (float) 0.10486838686563442765, (float)-0.03105361685110374845, (float)-0.06450524884075370758, (float)-0.02939198261121969816, |
| |
| (float) 1.78827593892108555290, (float) 0.95508210637394326553, (float)-0.18447626783899924429, (float)-0.44198126506275016437, |
| (float)-0.88404052492547413497, (float)-1.42218907262407452967, (float)-1.02037566838362314995, (float)-0.34861755756425577264, |
| (float)-0.11490230170431934434, (float) 0.12498899339968611803, (float) 0.38065885268563131927, (float) 0.31883491321310506562, |
| (float) 0.10486838686563442765, (float)-0.03105361685110374845, (float)-0.06450524884075370758, (float)-0.02939198261121969816, |
| }; |
| |
| |
| static const float F44_3 [16 + 32] = { /* SNR(w) = 15.382598 dB, SNR = -29.402334 dB */ |
| (float) 2.89072132015058161445, (float) 2.68932810943698754106, (float) 0.21083359339410251227, (float)-0.98385073324997617515, |
| (float)-1.11047823227097316719, (float)-2.18954076314139673147, (float)-2.36498032881953056225, (float)-0.95484132880101140785, |
| (float)-0.23924057925542965158, (float)-0.13865235703915925642, (float) 0.43587843191057992846, (float) 0.65903257226026665927, |
| (float) 0.24361815372443152787, (float)-0.00235974960154720097, (float) 0.01844166574603346289, (float) 0.01722945988740875099, |
| |
| (float) 2.89072132015058161445, (float) 2.68932810943698754106, (float) 0.21083359339410251227, (float)-0.98385073324997617515, |
| (float)-1.11047823227097316719, (float)-2.18954076314139673147, (float)-2.36498032881953056225, (float)-0.95484132880101140785, |
| (float)-0.23924057925542965158, (float)-0.13865235703915925642, (float) 0.43587843191057992846, (float) 0.65903257226026665927, |
| (float) 0.24361815372443152787, (float)-0.00235974960154720097, (float) 0.01844166574603346289, (float) 0.01722945988740875099, |
| |
| (float) 2.89072132015058161445, (float) 2.68932810943698754106, (float) 0.21083359339410251227, (float)-0.98385073324997617515, |
| (float)-1.11047823227097316719, (float)-2.18954076314139673147, (float)-2.36498032881953056225, (float)-0.95484132880101140785, |
| (float)-0.23924057925542965158, (float)-0.13865235703915925642, (float) 0.43587843191057992846, (float) 0.65903257226026665927, |
| (float) 0.24361815372443152787, (float)-0.00235974960154720097, (float) 0.01844166574603346289, (float) 0.01722945988740875099 |
| }; |
| |
| |
| static double scalar16_(const float* x, const float* y) |
| { |
| return |
| x[ 0]*y[ 0] + x[ 1]*y[ 1] + x[ 2]*y[ 2] + x[ 3]*y[ 3] + |
| x[ 4]*y[ 4] + x[ 5]*y[ 5] + x[ 6]*y[ 6] + x[ 7]*y[ 7] + |
| x[ 8]*y[ 8] + x[ 9]*y[ 9] + x[10]*y[10] + x[11]*y[11] + |
| x[12]*y[12] + x[13]*y[13] + x[14]*y[14] + x[15]*y[15]; |
| } |
| |
| |
| void FLAC__replaygain_synthesis__init_dither_context(DitherContext *d, int bits, int shapingtype) |
| { |
| static unsigned char default_dither [] = { 92, 92, 88, 84, 81, 78, 74, 67, 0, 0 }; |
| static const float* F [] = { F44_0, F44_1, F44_2, F44_3 }; |
| |
| int indx; |
| |
| if (shapingtype < 0) shapingtype = 0; |
| if (shapingtype > 3) shapingtype = 3; |
| d->ShapingType = (NoiseShaping)shapingtype; |
| indx = bits - 11 - shapingtype; |
| if (indx < 0) indx = 0; |
| if (indx > 9) indx = 9; |
| |
| memset ( d->ErrorHistory , 0, sizeof (d->ErrorHistory ) ); |
| memset ( d->DitherHistory, 0, sizeof (d->DitherHistory) ); |
| |
| d->FilterCoeff = F [shapingtype]; |
| d->Mask = ((FLAC__uint64)-1) << (32 - bits); |
| d->Add = 0.5 * ((1L << (32 - bits)) - 1); |
| d->Dither = 0.01f*default_dither[indx] / (((FLAC__int64)1) << bits); |
| d->LastHistoryIndex = 0; |
| } |
| |
| /* |
| * the following is based on parts of wavegain.c |
| */ |
| |
| static FLAC__int64 dither_output_(DitherContext *d, FLAC__bool do_dithering, int shapingtype, int i, double Sum, int k) |
| { |
| union { |
| double d; |
| FLAC__int64 i; |
| } doubletmp; |
| double Sum2; |
| FLAC__int64 val; |
| |
| #define ROUND64(x) ( doubletmp.d = (x) + d->Add + (FLAC__int64)FLAC__I64L(0x001FFFFD80000000), doubletmp.i - (FLAC__int64)FLAC__I64L(0x433FFFFD80000000) ) |
| |
| if(do_dithering) { |
| if(shapingtype == 0) { |
| double tmp = random_equi_(d->Dither); |
| Sum2 = tmp - d->LastRandomNumber [k]; |
| d->LastRandomNumber [k] = (int)tmp; |
| Sum2 = Sum += Sum2; |
| val = ROUND64(Sum2) & d->Mask; |
| } |
| else { |
| Sum2 = random_triangular_(d->Dither) - scalar16_(d->DitherHistory[k], d->FilterCoeff + i); |
| Sum += d->DitherHistory [k] [(-1-i)&15] = (float)Sum2; |
| Sum2 = Sum + scalar16_(d->ErrorHistory [k], d->FilterCoeff + i); |
| val = ROUND64(Sum2) & d->Mask; |
| d->ErrorHistory [k] [(-1-i)&15] = (float)(Sum - val); |
| } |
| return val; |
| } |
| else |
| return ROUND64(Sum); |
| |
| #undef ROUND64 |
| } |
| |
| #if 0 |
| float peak = 0.f, |
| new_peak, |
| factor_clip |
| double scale, |
| dB; |
| |
| ... |
| |
| peak is in the range -32768.0 .. 32767.0 |
| |
| /* calculate factors for ReplayGain and ClippingPrevention */ |
| *track_gain = GetTitleGain() + settings->man_gain; |
| scale = (float) pow(10., *track_gain * 0.05); |
| if(settings->clip_prev) { |
| factor_clip = (float) (32767./( peak + 1)); |
| if(scale < factor_clip) |
| factor_clip = 1.f; |
| else |
| factor_clip /= scale; |
| scale *= factor_clip; |
| } |
| new_peak = (float) peak * scale; |
| |
| dB = 20. * log10(scale); |
| *track_gain = (float) dB; |
| |
| const double scale = pow(10., (double)gain * 0.05); |
| #endif |
| |
| |
| size_t FLAC__replaygain_synthesis__apply_gain(FLAC__byte *data_out, FLAC__bool little_endian_data_out, FLAC__bool unsigned_data_out, const FLAC__int32 * const input[], unsigned wide_samples, unsigned channels, const unsigned source_bps, const unsigned target_bps, const double scale, const FLAC__bool hard_limit, FLAC__bool do_dithering, DitherContext *dither_context) |
| { |
| static const FLAC__int64 hard_clip_factors_[33] = { |
| 0, /* 0 bits-per-sample (not supported) */ |
| 0, /* 1 bits-per-sample (not supported) */ |
| 0, /* 2 bits-per-sample (not supported) */ |
| 0, /* 3 bits-per-sample (not supported) */ |
| -8, /* 4 bits-per-sample */ |
| -16, /* 5 bits-per-sample */ |
| -32, /* 6 bits-per-sample */ |
| -64, /* 7 bits-per-sample */ |
| -128, /* 8 bits-per-sample */ |
| -256, /* 9 bits-per-sample */ |
| -512, /* 10 bits-per-sample */ |
| -1024, /* 11 bits-per-sample */ |
| -2048, /* 12 bits-per-sample */ |
| -4096, /* 13 bits-per-sample */ |
| -8192, /* 14 bits-per-sample */ |
| -16384, /* 15 bits-per-sample */ |
| -32768, /* 16 bits-per-sample */ |
| -65536, /* 17 bits-per-sample */ |
| -131072, /* 18 bits-per-sample */ |
| -262144, /* 19 bits-per-sample */ |
| -524288, /* 20 bits-per-sample */ |
| -1048576, /* 21 bits-per-sample */ |
| -2097152, /* 22 bits-per-sample */ |
| -4194304, /* 23 bits-per-sample */ |
| -8388608, /* 24 bits-per-sample */ |
| -16777216, /* 25 bits-per-sample */ |
| -33554432, /* 26 bits-per-sample */ |
| -67108864, /* 27 bits-per-sample */ |
| -134217728, /* 28 bits-per-sample */ |
| -268435456, /* 29 bits-per-sample */ |
| -536870912, /* 30 bits-per-sample */ |
| -1073741824, /* 31 bits-per-sample */ |
| (FLAC__int64)(-1073741824) * 2 /* 32 bits-per-sample */ |
| }; |
| const FLAC__int32 conv_shift = 32 - target_bps; |
| const FLAC__int64 hard_clip_factor = hard_clip_factors_[target_bps]; |
| /* |
| * The integer input coming in has a varying range based on the |
| * source_bps. We want to normalize it to [-1.0, 1.0) so instead |
| * of doing two multiplies on each sample, we just multiple |
| * 'scale' by 1/(2^(source_bps-1)) |
| */ |
| const double multi_scale = scale / (double)(1u << (source_bps-1)); |
| |
| FLAC__byte * const start = data_out; |
| unsigned i, channel; |
| const FLAC__int32 *input_; |
| double sample; |
| const unsigned bytes_per_sample = target_bps / 8; |
| const unsigned last_history_index = dither_context->LastHistoryIndex; |
| NoiseShaping noise_shaping = dither_context->ShapingType; |
| FLAC__int64 val64; |
| FLAC__int32 val32; |
| FLAC__int32 uval32; |
| const FLAC__uint32 twiggle = 1u << (target_bps - 1); |
| |
| FLAC__ASSERT(channels > 0 && channels <= FLAC_SHARE__MAX_SUPPORTED_CHANNELS); |
| FLAC__ASSERT(source_bps >= 4); |
| FLAC__ASSERT(target_bps >= 4); |
| FLAC__ASSERT(source_bps <= 32); |
| FLAC__ASSERT(target_bps < 32); |
| FLAC__ASSERT((target_bps & 7) == 0); |
| |
| for(channel = 0; channel < channels; channel++) { |
| const unsigned incr = bytes_per_sample * channels; |
| data_out = start + bytes_per_sample * channel; |
| input_ = input[channel]; |
| for(i = 0; i < wide_samples; i++, data_out += incr) { |
| sample = (double)input_[i] * multi_scale; |
| |
| if(hard_limit) { |
| /* hard 6dB limiting */ |
| if(sample < -0.5) |
| sample = tanh((sample + 0.5) / (1-0.5)) * (1-0.5) - 0.5; |
| else if(sample > 0.5) |
| sample = tanh((sample - 0.5) / (1-0.5)) * (1-0.5) + 0.5; |
| } |
| sample *= 2147483647.; |
| |
| val64 = dither_output_(dither_context, do_dithering, noise_shaping, (i + last_history_index) % 32, sample, channel) >> conv_shift; |
| |
| val32 = (FLAC__int32)val64; |
| if(val64 >= -hard_clip_factor) |
| val32 = (FLAC__int32)(-(hard_clip_factor+1)); |
| else if(val64 < hard_clip_factor) |
| val32 = (FLAC__int32)hard_clip_factor; |
| |
| uval32 = (FLAC__uint32)val32; |
| if (unsigned_data_out) |
| uval32 ^= twiggle; |
| |
| if (little_endian_data_out) { |
| switch(target_bps) { |
| case 24: |
| data_out[2] = (FLAC__byte)(uval32 >> 16); |
| /* fall through */ |
| case 16: |
| data_out[1] = (FLAC__byte)(uval32 >> 8); |
| /* fall through */ |
| case 8: |
| data_out[0] = (FLAC__byte)uval32; |
| break; |
| } |
| } |
| else { |
| switch(target_bps) { |
| case 24: |
| data_out[0] = (FLAC__byte)(uval32 >> 16); |
| data_out[1] = (FLAC__byte)(uval32 >> 8); |
| data_out[2] = (FLAC__byte)uval32; |
| break; |
| case 16: |
| data_out[0] = (FLAC__byte)(uval32 >> 8); |
| data_out[1] = (FLAC__byte)uval32; |
| break; |
| case 8: |
| data_out[0] = (FLAC__byte)uval32; |
| break; |
| } |
| } |
| } |
| } |
| dither_context->LastHistoryIndex = (last_history_index + wide_samples) % 32; |
| |
| return wide_samples * channels * (target_bps/8); |
| } |