mirror of
https://github.com/mpv-player/mpv
synced 2024-12-13 02:15:59 +00:00
e24087509a
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@10990 b3059339-0415-0410-9bf9-f77b7e298cf2
245 lines
8.4 KiB
C
245 lines
8.4 KiB
C
/*
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** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
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** Copyright (C) 2003 M. Bakker, Ahead Software AG, http://www.nero.com
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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**
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** Any non-GPL usage of this software or parts of this software is strictly
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** forbidden.
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**
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** Commercial non-GPL licensing of this software is possible.
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** For more info contact Ahead Software through Mpeg4AAClicense@nero.com.
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**
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** $Id$
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**/
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#include "common.h"
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#include "structs.h"
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#include "output.h"
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#include "decoder.h"
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#ifndef FIXED_POINT
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#include "dither.h"
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#define ftol(A,B) {tmp = *(int32_t*) & A - 0x4B7F8000; \
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B = (int16_t)((tmp==(int16_t)tmp) ? tmp : (tmp>>31)^0x7FFF);}
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#define ROUND(x) ((x >= 0) ? (int32_t)floor((x) + 0.5) : (int32_t)ceil((x) + 0.5))
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#define ROUND32(x) ROUND(x)
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#define ROUND64(x) (doubletmp = (x) + Dither.Add + (int64_t)0x001FFFFD80000000L, *(int64_t*)(&doubletmp) - (int64_t)0x433FFFFD80000000L)
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#define FLOAT_SCALE (1.0f/(1<<15))
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dither_t Dither;
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double doubletmp;
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#define DM_MUL ((real_t)1.0/((real_t)1.0+(real_t)sqrt(2.0)))
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static INLINE real_t get_sample(real_t **input, uint8_t channel, uint16_t sample,
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uint8_t downMatrix, uint8_t *internal_channel)
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{
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if (downMatrix)
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{
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if (channel == 0)
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{
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return DM_MUL * (input[internal_channel[1]][sample] +
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input[internal_channel[0]][sample]/(real_t)sqrt(2.) +
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input[internal_channel[3]][sample]/(real_t)sqrt(2.));
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} else {
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return DM_MUL * (input[internal_channel[2]][sample] +
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input[internal_channel[0]][sample]/(real_t)sqrt(2.) +
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input[internal_channel[4]][sample]/(real_t)sqrt(2.));
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}
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} else {
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return input[internal_channel[channel]][sample];
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}
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}
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void* output_to_PCM(faacDecHandle hDecoder,
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real_t **input, void *sample_buffer, uint8_t channels,
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uint16_t frame_len, uint8_t format)
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{
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uint8_t ch;
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uint16_t i, j = 0;
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uint8_t internal_channel;
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int16_t *short_sample_buffer = (int16_t*)sample_buffer;
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int32_t *int_sample_buffer = (int32_t*)sample_buffer;
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float32_t *float_sample_buffer = (float32_t*)sample_buffer;
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double *double_sample_buffer = (double*)sample_buffer;
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/* Copy output to a standard PCM buffer */
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for (ch = 0; ch < channels; ch++)
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{
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internal_channel = hDecoder->internal_channel[ch];
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switch (format)
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{
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case FAAD_FMT_16BIT:
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for(i = 0; i < frame_len; i++)
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{
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int32_t tmp;
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real_t ftemp;
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//real_t inp = input[internal_channel][i];
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real_t inp = get_sample(input, ch, i, hDecoder->downMatrix, hDecoder->internal_channel);
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ftemp = inp + 0xff8000;
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ftol(ftemp, short_sample_buffer[(i*channels)+ch]);
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}
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break;
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case FAAD_FMT_16BIT_DITHER:
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for(i = 0; i < frame_len; i++, j++)
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{
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//real_t inp = input[internal_channel][i];
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real_t inp = get_sample(input, ch, i, hDecoder->downMatrix, hDecoder->internal_channel);
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double Sum = inp * 65535.f;
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int64_t val;
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if(j > 31)
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j = 0;
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val = dither_output(1, 0, j, Sum, ch) / 65536;
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if (val > (1<<15)-1)
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val = (1<<15)-1;
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else if (val < -(1<<15))
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val = -(1<<15);
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short_sample_buffer[(i*channels)+ch] = (int16_t)val;
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}
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break;
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case FAAD_FMT_16BIT_L_SHAPE:
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case FAAD_FMT_16BIT_M_SHAPE:
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case FAAD_FMT_16BIT_H_SHAPE:
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for(i = 0; i < frame_len; i++, j++)
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{
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//real_t inp = input[internal_channel][i];
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real_t inp = get_sample(input, ch, i, hDecoder->downMatrix, hDecoder->internal_channel);
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double Sum = inp * 65535.f;
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int64_t val;
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if(j > 31)
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j = 0;
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val = dither_output(1, 1, j, Sum, ch) / 65536;
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if (val > (1<<15)-1)
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val = (1<<15)-1;
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else if (val < -(1<<15))
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val = -(1<<15);
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short_sample_buffer[(i*channels)+ch] = (int16_t)val;
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}
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break;
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case FAAD_FMT_24BIT:
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for(i = 0; i < frame_len; i++)
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{
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//real_t inp = input[internal_channel][i];
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real_t inp = get_sample(input, ch, i, hDecoder->downMatrix, hDecoder->internal_channel);
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if (inp > (1<<15)-1)
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inp = (1<<15)-1;
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else if (inp < -(1<<15))
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inp = -(1<<15);
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int_sample_buffer[(i*channels)+ch] = ROUND(inp*(1<<8));
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}
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break;
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case FAAD_FMT_32BIT:
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for(i = 0; i < frame_len; i++)
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{
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//real_t inp = input[internal_channel][i];
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real_t inp = get_sample(input, ch, i, hDecoder->downMatrix, hDecoder->internal_channel);
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if (inp > (1<<15)-1)
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inp = (1<<15)-1;
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else if (inp < -(1<<15))
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inp = -(1<<15);
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int_sample_buffer[(i*channels)+ch] = ROUND32(inp*(1<<16));
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}
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break;
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case FAAD_FMT_FLOAT:
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for(i = 0; i < frame_len; i++)
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{
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//real_t inp = input[internal_channel][i];
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real_t inp = get_sample(input, ch, i, hDecoder->downMatrix, hDecoder->internal_channel);
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float_sample_buffer[(i*channels)+ch] = inp*FLOAT_SCALE;
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}
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break;
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case FAAD_FMT_DOUBLE:
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for(i = 0; i < frame_len; i++)
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{
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//real_t inp = input[internal_channel][i];
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real_t inp = get_sample(input, ch, i, hDecoder->downMatrix, hDecoder->internal_channel);
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double_sample_buffer[(i*channels)+ch] = (double)inp*FLOAT_SCALE;
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}
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break;
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}
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}
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return sample_buffer;
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}
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/* Dither output */
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static int64_t dither_output(uint8_t dithering, uint8_t shapingtype, uint16_t i, double Sum, uint8_t k)
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{
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double Sum2;
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int64_t val;
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if(dithering)
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{
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if(!shapingtype)
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{
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double tmp = Random_Equi(Dither.Dither);
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Sum2 = tmp - (double)Dither.LastRandomNumber[k];
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Dither.LastRandomNumber[k] = (int32_t)tmp;
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Sum2 = Sum += Sum2;
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val = ROUND64(Sum2)&Dither.Mask;
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} else {
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Sum2 = Random_Triangular(Dither.Dither) - scalar16(Dither.DitherHistory[k], Dither.FilterCoeff + i);
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Sum += Dither.DitherHistory[k][(-1-i)&15] = (float32_t)Sum2;
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Sum2 = Sum + scalar16(Dither.ErrorHistory[k], Dither.FilterCoeff + i );
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val = ROUND64(Sum2)&Dither.Mask;
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Dither.ErrorHistory[k][(-1-i)&15] = (float)(Sum - val);
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}
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return val;
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}
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else
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return ROUND64 (Sum);
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}
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#else
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void* output_to_PCM(faacDecHandle hDecoder,
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real_t **input, void *sample_buffer, uint8_t channels,
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uint16_t frame_len, uint8_t format)
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{
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uint8_t ch;
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uint16_t i;
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int16_t *short_sample_buffer = (int16_t*)sample_buffer;
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/* Copy output to a standard PCM buffer */
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for (ch = 0; ch < channels; ch++)
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{
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for(i = 0; i < frame_len; i++)
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{
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int32_t tmp = input[ch][i];
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tmp += (1 << (REAL_BITS-1));
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tmp >>= REAL_BITS;
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if (tmp > 0x7fff) tmp = 0x7fff;
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else if (tmp <= -32768) tmp = -32768;
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short_sample_buffer[(i*channels)+ch] = (int16_t)tmp;
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}
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}
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return sample_buffer;
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}
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#endif
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