mirror of https://git.ffmpeg.org/ffmpeg.git
204 lines
5.4 KiB
C
204 lines
5.4 KiB
C
/*
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* this code is based on a52dec/libao/audio_out_oss.c
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* copyright (C) 2001 Arpad Gereoffy
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*
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* This file is part of a52dec, a free ATSC A-52 stream decoder.
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* See http://liba52.sourceforge.net/ for updates.
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*
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* a52dec 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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* a52dec 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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static inline int16_t convert (int32_t i)
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{
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if (i > 0x43c07fff)
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return 32767;
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else if (i < 0x43bf8000)
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return -32768;
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else
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return i - 0x43c00000;
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}
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static int a52_resample_MONO_to_5_C(float * _f, int16_t * s16){
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int i;
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int32_t * f = (int32_t *) _f;
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for (i = 0; i < 256; i++) {
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s16[5*i] = s16[5*i+1] = s16[5*i+2] = s16[5*i+3] = 0;
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s16[5*i+4] = convert (f[i]);
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}
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return 5*256;
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}
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static int a52_resample_MONO_to_1_C(float * _f, int16_t * s16){
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int i;
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int32_t * f = (int32_t *) _f;
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for (i = 0; i < 256; i++) {
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s16[i] = convert (f[i]);
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}
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return 1*256;
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}
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static int a52_resample_STEREO_to_2_C(float * _f, int16_t * s16){
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int i;
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int32_t * f = (int32_t *) _f;
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for (i = 0; i < 256; i++) {
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s16[2*i] = convert (f[i]);
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s16[2*i+1] = convert (f[i+256]);
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}
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return 2*256;
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}
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static int a52_resample_3F_to_5_C(float * _f, int16_t * s16){
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int i;
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int32_t * f = (int32_t *) _f;
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for (i = 0; i < 256; i++) {
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s16[5*i] = convert (f[i]);
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s16[5*i+1] = convert (f[i+512]);
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s16[5*i+2] = s16[5*i+3] = 0;
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s16[5*i+4] = convert (f[i+256]);
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}
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return 5*256;
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}
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static int a52_resample_2F_2R_to_4_C(float * _f, int16_t * s16){
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int i;
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int32_t * f = (int32_t *) _f;
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for (i = 0; i < 256; i++) {
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s16[4*i] = convert (f[i]);
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s16[4*i+1] = convert (f[i+256]);
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s16[4*i+2] = convert (f[i+512]);
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s16[4*i+3] = convert (f[i+768]);
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}
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return 4*256;
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}
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static int a52_resample_3F_2R_to_5_C(float * _f, int16_t * s16){
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int i;
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int32_t * f = (int32_t *) _f;
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for (i = 0; i < 256; i++) {
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s16[5*i] = convert (f[i]);
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s16[5*i+1] = convert (f[i+512]);
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s16[5*i+2] = convert (f[i+768]);
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s16[5*i+3] = convert (f[i+1024]);
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s16[5*i+4] = convert (f[i+256]);
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}
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return 5*256;
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}
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static int a52_resample_MONO_LFE_to_6_C(float * _f, int16_t * s16){
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int i;
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int32_t * f = (int32_t *) _f;
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for (i = 0; i < 256; i++) {
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s16[6*i] = s16[6*i+1] = s16[6*i+2] = s16[6*i+3] = 0;
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s16[6*i+4] = convert (f[i+256]);
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s16[6*i+5] = convert (f[i]);
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}
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return 6*256;
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}
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static int a52_resample_STEREO_LFE_to_6_C(float * _f, int16_t * s16){
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int i;
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int32_t * f = (int32_t *) _f;
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for (i = 0; i < 256; i++) {
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s16[6*i] = convert (f[i+256]);
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s16[6*i+1] = convert (f[i+512]);
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s16[6*i+2] = s16[6*i+3] = s16[6*i+4] = 0;
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s16[6*i+5] = convert (f[i]);
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}
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return 6*256;
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}
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static int a52_resample_3F_LFE_to_6_C(float * _f, int16_t * s16){
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int i;
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int32_t * f = (int32_t *) _f;
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for (i = 0; i < 256; i++) {
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s16[6*i] = convert (f[i+256]);
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s16[6*i+1] = convert (f[i+768]);
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s16[6*i+2] = s16[6*i+3] = 0;
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s16[6*i+4] = convert (f[i+512]);
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s16[6*i+5] = convert (f[i]);
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}
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return 6*256;
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}
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static int a52_resample_2F_2R_LFE_to_6_C(float * _f, int16_t * s16){
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int i;
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int32_t * f = (int32_t *) _f;
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for (i = 0; i < 256; i++) {
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s16[6*i] = convert (f[i+256]);
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s16[6*i+1] = convert (f[i+512]);
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s16[6*i+2] = convert (f[i+768]);
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s16[6*i+3] = convert (f[i+1024]);
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s16[6*i+4] = 0;
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s16[6*i+5] = convert (f[i]);
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}
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return 6*256;
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}
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static int a52_resample_3F_2R_LFE_to_6_C(float * _f, int16_t * s16){
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int i;
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int32_t * f = (int32_t *) _f;
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for (i = 0; i < 256; i++) {
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s16[6*i] = convert (f[i+256]);
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s16[6*i+1] = convert (f[i+768]);
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s16[6*i+2] = convert (f[i+1024]);
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s16[6*i+3] = convert (f[i+1280]);
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s16[6*i+4] = convert (f[i+512]);
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s16[6*i+5] = convert (f[i]);
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}
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return 6*256;
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}
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static void* a52_resample_C(int flags, int ch){
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switch (flags) {
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case A52_MONO:
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if(ch==5) return a52_resample_MONO_to_5_C;
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if(ch==1) return a52_resample_MONO_to_1_C;
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break;
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case A52_CHANNEL:
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case A52_STEREO:
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case A52_DOLBY:
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if(ch==2) return a52_resample_STEREO_to_2_C;
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break;
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case A52_3F:
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if(ch==5) return a52_resample_3F_to_5_C;
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break;
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case A52_2F2R:
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if(ch==4) return a52_resample_2F_2R_to_4_C;
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break;
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case A52_3F2R:
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if(ch==5) return a52_resample_3F_2R_to_5_C;
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break;
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case A52_MONO | A52_LFE:
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if(ch==6) return a52_resample_MONO_LFE_to_6_C;
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break;
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case A52_CHANNEL | A52_LFE:
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case A52_STEREO | A52_LFE:
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case A52_DOLBY | A52_LFE:
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if(ch==6) return a52_resample_STEREO_LFE_to_6_C;
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break;
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case A52_3F | A52_LFE:
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if(ch==6) return a52_resample_3F_LFE_to_6_C;
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break;
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case A52_2F2R | A52_LFE:
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if(ch==6) return a52_resample_2F_2R_LFE_to_6_C;
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break;
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case A52_3F2R | A52_LFE:
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if(ch==6) return a52_resample_3F_2R_LFE_to_6_C;
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break;
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}
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return NULL;
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}
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