584 lines
20 KiB
C
584 lines
20 KiB
C
/*
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** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
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** Copyright (C) 2003-2005 M. Bakker, Nero 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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** The "appropriate copyright message" mentioned in section 2c of the GPLv2
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** must read: "Code from FAAD2 is copyright (c) Nero AG, www.nero.com"
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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 Nero AG through [email protected].
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**
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** $Id: output.c,v 1.47 2009/01/26 23:51:15 menno Exp $
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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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#ifndef FIXED_POINT
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#define FLOAT_SCALE (1.0f/(1<<15))
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#define DM_MUL 1//REAL_CONST(0.3203772410170407) // 1/(1+sqrt(2) + 1/sqrt(2))
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#define RSQRT2 REAL_CONST(0.7071067811865475244) // 1/sqrt(2)
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/*
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There are two types of down-mix to stereo:
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1. Lt/Rt downmix:
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Lt = L + (0.707*C) - (0.707*Ls) - (0.707*Rs)
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Rt = R + (0.707*C) + (0.707*Ls) + (0.707*Rs)
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2. Lo/Ro downmix:
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Lo = L + (0.707*C) + (0.707*Ls)
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Ro = R + (0.707*C) + (0.707*Rs)
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*/
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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 down_matrix, uint8_t *internal_channel)
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{
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if (!down_matrix) {
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return input[internal_channel[channel]][sample];
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}
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// for multi-channel( > 2ch ) downmix to 2ch case
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#if 0 //LoRo downmix mode
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if (channel == 0) {
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return DM_MUL * (input[internal_channel[1]][sample] +
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input[internal_channel[0]][sample] * RSQRT2 +
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input[internal_channel[3]][sample] * RSQRT2);
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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] * RSQRT2 +
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input[internal_channel[4]][sample] * RSQRT2);
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}
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#else //LtRt downmix mode
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if (channel == 0) {
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return DM_MUL * (input[internal_channel[1]][sample] +
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input[internal_channel[0]][sample] * RSQRT2 -
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input[internal_channel[3]][sample] * RSQRT2 - input[internal_channel[4]][sample] * RSQRT2);
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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] * RSQRT2 +
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input[internal_channel[3]][sample] * RSQRT2 +
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input[internal_channel[4]][sample] * RSQRT2);
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}
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#endif
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}
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#ifndef HAS_LRINTF
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#define CLIP(sample, max, min) \
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if (sample >= 0.0f) \
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{ \
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sample += 0.5f; \
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if (sample >= max) \
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sample = max; \
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} else { \
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sample += -0.5f; \
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if (sample <= min) \
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sample = min; \
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}
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#else
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#define CLIP(sample, max, min) \
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if (sample >= 0.0f) \
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{ \
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if (sample >= max) \
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sample = max; \
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} else { \
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if (sample <= min) \
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sample = min; \
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}
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#endif
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#define CONV(a,b) ((a<<1)|(b&0x1))
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static void to_PCM_16bit(NeAACDecStruct *hDecoder, real_t **input,
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uint8_t channels, uint16_t frame_len,
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int16_t **sample_buffer)
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{
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uint8_t ch, ch1;
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uint16_t i;
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uint16_t k;
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switch (CONV(channels, hDecoder->downMatrix)) {
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case CONV(1, 0):
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case CONV(1, 1):
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for (i = 0; i < frame_len; i++) {
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real_t inp = input[hDecoder->internal_channel[0]][i];
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CLIP(inp, 32767.0f, -32768.0f);
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(*sample_buffer)[i] = (int16_t)lrintf(inp);
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}
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break;
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case CONV(2, 0):
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if (hDecoder->upMatrix) {
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ch = hDecoder->internal_channel[0];
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for (i = 0; i < frame_len; i++) {
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real_t inp0 = input[ch][i];
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CLIP(inp0, 32767.0f, -32768.0f);
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(*sample_buffer)[(i * 2) + 0] = (int16_t)lrintf(inp0);
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(*sample_buffer)[(i * 2) + 1] = (int16_t)lrintf(inp0);
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}
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} else {
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ch = hDecoder->internal_channel[0];
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ch1 = hDecoder->internal_channel[1];
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for (i = 0; i < frame_len; i++) {
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real_t inp0 = input[ch ][i];
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real_t inp1 = input[ch1][i];
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CLIP(inp0, 32767.0f, -32768.0f);
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CLIP(inp1, 32767.0f, -32768.0f);
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(*sample_buffer)[(i * 2) + 0] = (int16_t)lrintf(inp0);
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(*sample_buffer)[(i * 2) + 1] = (int16_t)lrintf(inp1);
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}
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}
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break;
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default:
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#if 0
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for (ch = 0; ch < channels; ch++) {
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for (i = 0; i < frame_len; i++) {
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real_t inp = get_sample(input, ch, i, hDecoder->downMatrix, hDecoder->internal_channel);
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CLIP(inp, 32767.0f, -32768.0f);
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(*sample_buffer)[(i * channels) + ch] = (int16_t)lrintf(inp);
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}
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}
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#endif
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if (channels == 6) {
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for (ch = 0; ch < channels; ch += 6) {
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for (i = 0; i < frame_len; i++) {
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real_t inp[6];
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real_t Lt, Rt;
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for (k = 0; k < 6; k++) {
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inp[k] = get_sample(input, ch + k, i, hDecoder->downMatrix, hDecoder->internal_channel);
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CLIP(inp[k], 32767.0f, -32768.0f);
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}
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Lt = 1.0 * inp[1] + 0.707 * inp[0] - 0.707 * inp[3] - 0.707 * inp[4];
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Rt = 1.0 * inp[2] + 0.707 * inp[0] + 0.707 * inp[3] - 0.707 * inp[4];
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(*sample_buffer)[(i * channels) + ch] = (int16_t)lrintf(Lt);
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(*sample_buffer)[(i * channels) + ch + 1] = (int16_t)lrintf(Rt);
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}
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}
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} else if (4 == channels) {
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for (ch = 0; ch < channels; ch++) {
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if (ch % 2 != 0) {
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continue;
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}
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for (i = 0; i < frame_len; i++) {
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real_t inp = get_sample(input, ch, i, hDecoder->downMatrix, hDecoder->internal_channel);
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CLIP(inp, 32767.0f, -32768.0f);
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if (ch > 0) {
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ch = 1;
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}
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(*sample_buffer)[(i * channels) + ch] = (int16_t)lrintf(inp);
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}
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}
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} else {
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for (ch = 0; ch < channels; ch++) {
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for (i = 0; i < frame_len; i++) {
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real_t inp = get_sample(input, ch, i, hDecoder->downMatrix, hDecoder->internal_channel);
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CLIP(inp, 32767.0f, -32768.0f);
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(*sample_buffer)[(i * channels) + ch] = (int16_t)lrintf(inp);
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}
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}
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}
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break;
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}
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}
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static void to_PCM_24bit(NeAACDecStruct *hDecoder, real_t **input,
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uint8_t channels, uint16_t frame_len,
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int32_t **sample_buffer)
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{
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uint8_t ch, ch1;
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uint16_t i;
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switch (CONV(channels, hDecoder->downMatrix)) {
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case CONV(1, 0):
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case CONV(1, 1):
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for (i = 0; i < frame_len; i++) {
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real_t inp = input[hDecoder->internal_channel[0]][i];
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inp *= 256.0f;
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CLIP(inp, 8388607.0f, -8388608.0f);
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(*sample_buffer)[i] = (int32_t)lrintf(inp);
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}
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break;
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case CONV(2, 0):
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if (hDecoder->upMatrix) {
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ch = hDecoder->internal_channel[0];
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for (i = 0; i < frame_len; i++) {
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real_t inp0 = input[ch][i];
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inp0 *= 256.0f;
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CLIP(inp0, 8388607.0f, -8388608.0f);
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(*sample_buffer)[(i * 2) + 0] = (int32_t)lrintf(inp0);
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(*sample_buffer)[(i * 2) + 1] = (int32_t)lrintf(inp0);
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}
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} else {
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ch = hDecoder->internal_channel[0];
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ch1 = hDecoder->internal_channel[1];
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for (i = 0; i < frame_len; i++) {
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real_t inp0 = input[ch ][i];
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real_t inp1 = input[ch1][i];
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inp0 *= 256.0f;
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inp1 *= 256.0f;
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CLIP(inp0, 8388607.0f, -8388608.0f);
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CLIP(inp1, 8388607.0f, -8388608.0f);
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(*sample_buffer)[(i * 2) + 0] = (int32_t)lrintf(inp0);
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(*sample_buffer)[(i * 2) + 1] = (int32_t)lrintf(inp1);
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}
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}
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break;
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default:
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for (ch = 0; ch < channels; ch++) {
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for (i = 0; i < frame_len; i++) {
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real_t inp = get_sample(input, ch, i, hDecoder->downMatrix, hDecoder->internal_channel);
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inp *= 256.0f;
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CLIP(inp, 8388607.0f, -8388608.0f);
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(*sample_buffer)[(i * channels) + ch] = (int32_t)lrintf(inp);
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}
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}
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break;
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}
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}
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static void to_PCM_32bit(NeAACDecStruct *hDecoder, real_t **input,
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uint8_t channels, uint16_t frame_len,
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int32_t **sample_buffer)
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{
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uint8_t ch, ch1;
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uint16_t i;
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switch (CONV(channels, hDecoder->downMatrix)) {
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case CONV(1, 0):
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case CONV(1, 1):
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for (i = 0; i < frame_len; i++) {
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real_t inp = input[hDecoder->internal_channel[0]][i];
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inp *= 65536.0f;
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CLIP(inp, 2147483647.0f, -2147483648.0f);
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(*sample_buffer)[i] = (int32_t)lrintf(inp);
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}
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break;
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case CONV(2, 0):
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if (hDecoder->upMatrix) {
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ch = hDecoder->internal_channel[0];
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for (i = 0; i < frame_len; i++) {
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real_t inp0 = input[ch][i];
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inp0 *= 65536.0f;
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CLIP(inp0, 2147483647.0f, -2147483648.0f);
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(*sample_buffer)[(i * 2) + 0] = (int32_t)lrintf(inp0);
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(*sample_buffer)[(i * 2) + 1] = (int32_t)lrintf(inp0);
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}
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} else {
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ch = hDecoder->internal_channel[0];
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ch1 = hDecoder->internal_channel[1];
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for (i = 0; i < frame_len; i++) {
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real_t inp0 = input[ch ][i];
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real_t inp1 = input[ch1][i];
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inp0 *= 65536.0f;
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inp1 *= 65536.0f;
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CLIP(inp0, 2147483647.0f, -2147483648.0f);
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CLIP(inp1, 2147483647.0f, -2147483648.0f);
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(*sample_buffer)[(i * 2) + 0] = (int32_t)lrintf(inp0);
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(*sample_buffer)[(i * 2) + 1] = (int32_t)lrintf(inp1);
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}
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}
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break;
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default:
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for (ch = 0; ch < channels; ch++) {
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for (i = 0; i < frame_len; i++) {
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real_t inp = get_sample(input, ch, i, hDecoder->downMatrix, hDecoder->internal_channel);
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inp *= 65536.0f;
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CLIP(inp, 2147483647.0f, -2147483648.0f);
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(*sample_buffer)[(i * channels) + ch] = (int32_t)lrintf(inp);
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}
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}
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break;
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}
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}
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static void to_PCM_float(NeAACDecStruct *hDecoder, real_t **input,
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uint8_t channels, uint16_t frame_len,
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float32_t **sample_buffer)
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{
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uint8_t ch, ch1;
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uint16_t i;
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switch (CONV(channels, hDecoder->downMatrix)) {
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case CONV(1, 0):
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case CONV(1, 1):
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for (i = 0; i < frame_len; i++) {
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real_t inp = input[hDecoder->internal_channel[0]][i];
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(*sample_buffer)[i] = inp * FLOAT_SCALE;
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}
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break;
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case CONV(2, 0):
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if (hDecoder->upMatrix) {
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ch = hDecoder->internal_channel[0];
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for (i = 0; i < frame_len; i++) {
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real_t inp0 = input[ch][i];
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(*sample_buffer)[(i * 2) + 0] = inp0 * FLOAT_SCALE;
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(*sample_buffer)[(i * 2) + 1] = inp0 * FLOAT_SCALE;
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}
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} else {
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ch = hDecoder->internal_channel[0];
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ch1 = hDecoder->internal_channel[1];
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for (i = 0; i < frame_len; i++) {
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real_t inp0 = input[ch ][i];
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real_t inp1 = input[ch1][i];
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(*sample_buffer)[(i * 2) + 0] = inp0 * FLOAT_SCALE;
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(*sample_buffer)[(i * 2) + 1] = inp1 * FLOAT_SCALE;
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}
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}
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break;
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default:
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for (ch = 0; ch < channels; ch++) {
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for (i = 0; i < frame_len; i++) {
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real_t inp = get_sample(input, ch, i, hDecoder->downMatrix, hDecoder->internal_channel);
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(*sample_buffer)[(i * channels) + ch] = inp * FLOAT_SCALE;
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}
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}
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break;
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}
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}
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static void to_PCM_double(NeAACDecStruct *hDecoder, real_t **input,
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uint8_t channels, uint16_t frame_len,
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double **sample_buffer)
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{
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uint8_t ch, ch1;
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uint16_t i;
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switch (CONV(channels, hDecoder->downMatrix)) {
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case CONV(1, 0):
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case CONV(1, 1):
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for (i = 0; i < frame_len; i++) {
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real_t inp = input[hDecoder->internal_channel[0]][i];
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(*sample_buffer)[i] = (double)inp * FLOAT_SCALE;
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}
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break;
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case CONV(2, 0):
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if (hDecoder->upMatrix) {
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ch = hDecoder->internal_channel[0];
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for (i = 0; i < frame_len; i++) {
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real_t inp0 = input[ch][i];
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(*sample_buffer)[(i * 2) + 0] = (double)inp0 * FLOAT_SCALE;
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(*sample_buffer)[(i * 2) + 1] = (double)inp0 * FLOAT_SCALE;
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}
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} else {
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ch = hDecoder->internal_channel[0];
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ch1 = hDecoder->internal_channel[1];
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for (i = 0; i < frame_len; i++) {
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real_t inp0 = input[ch ][i];
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real_t inp1 = input[ch1][i];
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(*sample_buffer)[(i * 2) + 0] = (double)inp0 * FLOAT_SCALE;
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(*sample_buffer)[(i * 2) + 1] = (double)inp1 * FLOAT_SCALE;
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}
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}
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break;
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default:
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for (ch = 0; ch < channels; ch++) {
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for (i = 0; i < frame_len; i++) {
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real_t inp = get_sample(input, ch, i, hDecoder->downMatrix, hDecoder->internal_channel);
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(*sample_buffer)[(i * channels) + ch] = (double)inp * FLOAT_SCALE;
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}
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}
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break;
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}
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}
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void *output_to_PCM(NeAACDecStruct *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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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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#ifdef PROFILE
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int64_t count = faad_get_ts();
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#endif
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/* Copy output to a standard PCM buffer */
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switch (format) {
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case FAAD_FMT_16BIT:
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to_PCM_16bit(hDecoder, input, channels, frame_len, &short_sample_buffer);
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break;
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case FAAD_FMT_24BIT:
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to_PCM_24bit(hDecoder, input, channels, frame_len, &int_sample_buffer);
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break;
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case FAAD_FMT_32BIT:
|
|
to_PCM_32bit(hDecoder, input, channels, frame_len, &int_sample_buffer);
|
|
break;
|
|
case FAAD_FMT_FLOAT:
|
|
to_PCM_float(hDecoder, input, channels, frame_len, &float_sample_buffer);
|
|
break;
|
|
case FAAD_FMT_DOUBLE:
|
|
to_PCM_double(hDecoder, input, channels, frame_len, &double_sample_buffer);
|
|
break;
|
|
}
|
|
|
|
#ifdef PROFILE
|
|
count = faad_get_ts() - count;
|
|
hDecoder->output_cycles += count;
|
|
#endif
|
|
|
|
return sample_buffer;
|
|
}
|
|
|
|
#else
|
|
|
|
#define DM_MUL FRAC_CONST(0.3203772410170407) // 1/(1+sqrt(2) + 1/sqrt(2))
|
|
#define RSQRT2 FRAC_CONST(0.7071067811865475244) // 1/sqrt(2)
|
|
|
|
static INLINE real_t get_sample(real_t **input, uint8_t channel, uint16_t sample,
|
|
uint8_t down_matrix, uint8_t up_matrix,
|
|
uint8_t *internal_channel)
|
|
{
|
|
if (up_matrix == 1) {
|
|
return input[internal_channel[0]][sample];
|
|
}
|
|
|
|
if (!down_matrix) {
|
|
return input[internal_channel[channel]][sample];
|
|
}
|
|
|
|
if (channel == 0) {
|
|
real_t C = MUL_F(input[internal_channel[0]][sample], RSQRT2);
|
|
real_t L_S = MUL_F(input[internal_channel[3]][sample], RSQRT2);
|
|
real_t cum = input[internal_channel[1]][sample] + C + L_S;
|
|
return MUL_F(cum, DM_MUL);
|
|
} else {
|
|
real_t C = MUL_F(input[internal_channel[0]][sample], RSQRT2);
|
|
real_t R_S = MUL_F(input[internal_channel[4]][sample], RSQRT2);
|
|
real_t cum = input[internal_channel[2]][sample] + C + R_S;
|
|
return MUL_F(cum, DM_MUL);
|
|
}
|
|
}
|
|
|
|
void* output_to_PCM(NeAACDecStruct *hDecoder,
|
|
real_t **input, void *sample_buffer, uint8_t channels,
|
|
uint16_t frame_len, uint8_t format)
|
|
{
|
|
uint8_t ch;
|
|
uint16_t i;
|
|
int16_t *short_sample_buffer = (int16_t*)sample_buffer;
|
|
int32_t *int_sample_buffer = (int32_t*)sample_buffer;
|
|
|
|
/* Copy output to a standard PCM buffer */
|
|
for (ch = 0; ch < channels; ch++) {
|
|
switch (format) {
|
|
case FAAD_FMT_16BIT:
|
|
for (i = 0; i < frame_len; i++) {
|
|
int32_t tmp = get_sample(input, ch, i, hDecoder->downMatrix, hDecoder->upMatrix,
|
|
hDecoder->internal_channel);
|
|
if (tmp >= 0) {
|
|
tmp += (1 << (REAL_BITS - 1));
|
|
if (tmp >= REAL_CONST(32767)) {
|
|
tmp = REAL_CONST(32767);
|
|
}
|
|
} else {
|
|
tmp += -(1 << (REAL_BITS - 1));
|
|
if (tmp <= REAL_CONST(-32768)) {
|
|
tmp = REAL_CONST(-32768);
|
|
}
|
|
}
|
|
tmp >>= REAL_BITS;
|
|
short_sample_buffer[(i * channels) + ch] = (int16_t)tmp;
|
|
}
|
|
break;
|
|
case FAAD_FMT_24BIT:
|
|
for (i = 0; i < frame_len; i++) {
|
|
int32_t tmp = get_sample(input, ch, i, hDecoder->downMatrix, hDecoder->upMatrix,
|
|
hDecoder->internal_channel);
|
|
if (tmp >= 0) {
|
|
tmp += (1 << (REAL_BITS - 9));
|
|
tmp >>= (REAL_BITS - 8);
|
|
if (tmp >= 8388607) {
|
|
tmp = 8388607;
|
|
}
|
|
} else {
|
|
tmp += -(1 << (REAL_BITS - 9));
|
|
tmp >>= (REAL_BITS - 8);
|
|
if (tmp <= -8388608) {
|
|
tmp = -8388608;
|
|
}
|
|
}
|
|
int_sample_buffer[(i * channels) + ch] = (int32_t)tmp;
|
|
}
|
|
break;
|
|
case FAAD_FMT_32BIT:
|
|
for (i = 0; i < frame_len; i++) {
|
|
int32_t tmp = get_sample(input, ch, i, hDecoder->downMatrix, hDecoder->upMatrix,
|
|
hDecoder->internal_channel);
|
|
if (tmp >= 0) {
|
|
tmp += (1 << (16 - REAL_BITS - 1));
|
|
tmp <<= (16 - REAL_BITS);
|
|
} else {
|
|
tmp += -(1 << (16 - REAL_BITS - 1));
|
|
tmp <<= (16 - REAL_BITS);
|
|
}
|
|
int_sample_buffer[(i * channels) + ch] = (int32_t)tmp;
|
|
}
|
|
break;
|
|
case FAAD_FMT_FIXED:
|
|
for (i = 0; i < frame_len; i++) {
|
|
real_t tmp = get_sample(input, ch, i, hDecoder->downMatrix, hDecoder->upMatrix,
|
|
hDecoder->internal_channel);
|
|
int_sample_buffer[(i * channels) + ch] = (int32_t)tmp;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
return sample_buffer;
|
|
}
|
|
|
|
#endif
|