mirror of
https://github.com/mpv-player/mpv
synced 2024-12-15 11:25:10 +00:00
e7ed9710f6
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@3968 b3059339-0415-0410-9bf9-f77b7e298cf2
184 lines
4.5 KiB
C
184 lines
4.5 KiB
C
// this code is based on a52dec/libao/audio_out_oss.c
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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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