diff options
Diffstat (limited to '3rdparty/libflac/src/plugin_common/dither.c')
-rw-r--r-- | 3rdparty/libflac/src/plugin_common/dither.c | 262 |
1 files changed, 0 insertions, 262 deletions
diff --git a/3rdparty/libflac/src/plugin_common/dither.c b/3rdparty/libflac/src/plugin_common/dither.c deleted file mode 100644 index 538a28029e0..00000000000 --- a/3rdparty/libflac/src/plugin_common/dither.c +++ /dev/null @@ -1,262 +0,0 @@ -/* plugin_common - Routines common to several plugins - * Copyright (C) 2002,2003,2004,2005,2006,2007 Josh Coalson - * - * dithering routine derived from (other GPLed source): - * mad - MPEG audio decoder - * Copyright (C) 2000-2001 Robert Leslie - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version 2 - * of the License, or (at your option) any later version. - * - * This program 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 General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - */ - -#if HAVE_CONFIG_H -# include <config.h> -#endif - -#include "dither.h" -#include "FLAC/assert.h" - -#ifdef max -#undef max -#endif -#define max(a,b) ((a)>(b)?(a):(b)) - -#ifndef FLaC__INLINE -#define FLaC__INLINE -#endif - - -/* 32-bit pseudo-random number generator - * - * @@@ According to Miroslav, this one is poor quality, the one from the - * @@@ original replaygain code is much better - */ -static FLaC__INLINE FLAC__uint32 prng(FLAC__uint32 state) -{ - return (state * 0x0019660dL + 0x3c6ef35fL) & 0xffffffffL; -} - -/* dither routine derived from MAD winamp plugin */ - -typedef struct { - FLAC__int32 error[3]; - FLAC__int32 random; -} dither_state; - -static FLaC__INLINE FLAC__int32 linear_dither(unsigned source_bps, unsigned target_bps, FLAC__int32 sample, dither_state *dither, const FLAC__int32 MIN, const FLAC__int32 MAX) -{ - unsigned scalebits; - FLAC__int32 output, mask, random; - - FLAC__ASSERT(source_bps < 32); - FLAC__ASSERT(target_bps <= 24); - FLAC__ASSERT(target_bps <= source_bps); - - /* noise shape */ - sample += dither->error[0] - dither->error[1] + dither->error[2]; - - dither->error[2] = dither->error[1]; - dither->error[1] = dither->error[0] / 2; - - /* bias */ - output = sample + (1L << (source_bps - target_bps - 1)); - - scalebits = source_bps - target_bps; - mask = (1L << scalebits) - 1; - - /* dither */ - random = (FLAC__int32)prng(dither->random); - output += (random & mask) - (dither->random & mask); - - dither->random = random; - - /* clip */ - if(output > MAX) { - output = MAX; - - if(sample > MAX) - sample = MAX; - } - else if(output < MIN) { - output = MIN; - - if(sample < MIN) - sample = MIN; - } - - /* quantize */ - output &= ~mask; - - /* error feedback */ - dither->error[0] = sample - output; - - /* scale */ - return output >> scalebits; -} - -size_t FLAC__plugin_common__pack_pcm_signed_big_endian(FLAC__byte *data, const FLAC__int32 * const input[], unsigned wide_samples, unsigned channels, unsigned source_bps, unsigned target_bps) -{ - static dither_state dither[FLAC_PLUGIN__MAX_SUPPORTED_CHANNELS]; - FLAC__byte * const start = data; - FLAC__int32 sample; - const FLAC__int32 *input_; - unsigned samples, channel; - const unsigned bytes_per_sample = target_bps / 8; - const unsigned incr = bytes_per_sample * channels; - - FLAC__ASSERT(channels > 0 && channels <= FLAC_PLUGIN__MAX_SUPPORTED_CHANNELS); - FLAC__ASSERT(source_bps < 32); - FLAC__ASSERT(target_bps <= 24); - FLAC__ASSERT(target_bps <= source_bps); - FLAC__ASSERT((source_bps & 7) == 0); - FLAC__ASSERT((target_bps & 7) == 0); - - if(source_bps != target_bps) { - const FLAC__int32 MIN = -(1L << (source_bps - 1)); - const FLAC__int32 MAX = ~MIN; /*(1L << (source_bps-1)) - 1 */ - - for(channel = 0; channel < channels; channel++) { - - samples = wide_samples; - data = start + bytes_per_sample * channel; - input_ = input[channel]; - - while(samples--) { - sample = linear_dither(source_bps, target_bps, *input_++, &dither[channel], MIN, MAX); - - switch(target_bps) { - case 8: - data[0] = sample ^ 0x80; - break; - case 16: - data[0] = (FLAC__byte)(sample >> 8); - data[1] = (FLAC__byte)sample; - break; - case 24: - data[0] = (FLAC__byte)(sample >> 16); - data[1] = (FLAC__byte)(sample >> 8); - data[2] = (FLAC__byte)sample; - break; - } - - data += incr; - } - } - } - else { - for(channel = 0; channel < channels; channel++) { - samples = wide_samples; - data = start + bytes_per_sample * channel; - input_ = input[channel]; - - while(samples--) { - sample = *input_++; - - switch(target_bps) { - case 8: - data[0] = sample ^ 0x80; - break; - case 16: - data[0] = (FLAC__byte)(sample >> 8); - data[1] = (FLAC__byte)sample; - break; - case 24: - data[0] = (FLAC__byte)(sample >> 16); - data[1] = (FLAC__byte)(sample >> 8); - data[2] = (FLAC__byte)sample; - break; - } - - data += incr; - } - } - } - - return wide_samples * channels * (target_bps/8); -} - -size_t FLAC__plugin_common__pack_pcm_signed_little_endian(FLAC__byte *data, const FLAC__int32 * const input[], unsigned wide_samples, unsigned channels, unsigned source_bps, unsigned target_bps) -{ - static dither_state dither[FLAC_PLUGIN__MAX_SUPPORTED_CHANNELS]; - FLAC__byte * const start = data; - FLAC__int32 sample; - const FLAC__int32 *input_; - unsigned samples, channel; - const unsigned bytes_per_sample = target_bps / 8; - const unsigned incr = bytes_per_sample * channels; - - FLAC__ASSERT(channels > 0 && channels <= FLAC_PLUGIN__MAX_SUPPORTED_CHANNELS); - FLAC__ASSERT(source_bps < 32); - FLAC__ASSERT(target_bps <= 24); - FLAC__ASSERT(target_bps <= source_bps); - FLAC__ASSERT((source_bps & 7) == 0); - FLAC__ASSERT((target_bps & 7) == 0); - - if(source_bps != target_bps) { - const FLAC__int32 MIN = -(1L << (source_bps - 1)); - const FLAC__int32 MAX = ~MIN; /*(1L << (source_bps-1)) - 1 */ - - for(channel = 0; channel < channels; channel++) { - - samples = wide_samples; - data = start + bytes_per_sample * channel; - input_ = input[channel]; - - while(samples--) { - sample = linear_dither(source_bps, target_bps, *input_++, &dither[channel], MIN, MAX); - - switch(target_bps) { - case 8: - data[0] = sample ^ 0x80; - break; - case 24: - data[2] = (FLAC__byte)(sample >> 16); - /* fall through */ - case 16: - data[1] = (FLAC__byte)(sample >> 8); - data[0] = (FLAC__byte)sample; - } - - data += incr; - } - } - } - else { - for(channel = 0; channel < channels; channel++) { - samples = wide_samples; - data = start + bytes_per_sample * channel; - input_ = input[channel]; - - while(samples--) { - sample = *input_++; - - switch(target_bps) { - case 8: - data[0] = sample ^ 0x80; - break; - case 24: - data[2] = (FLAC__byte)(sample >> 16); - /* fall through */ - case 16: - data[1] = (FLAC__byte)(sample >> 8); - data[0] = (FLAC__byte)sample; - } - - data += incr; - } - } - } - - return wide_samples * channels * (target_bps/8); -} |