resample_c.c
资源名称:tcpmp.rar [点击查看]
上传用户:wstnjxml
上传日期:2014-04-03
资源大小:7248k
文件大小:5k
源码类别:
Windows CE
开发平台:
C/C++
- // this code is based on a52dec/libao/audio_out_oss.c
- static inline int16_t convert (int32_t i)
- {
- if (i > 0x43c07fff)
- return 32767;
- else if (i < 0x43bf8000)
- return -32768;
- else
- return i - 0x43c00000;
- }
- static int a52_resample_MONO_to_5_C(float * _f, int16_t * s16){
- int i;
- int32_t * f = (int32_t *) _f;
- for (i = 0; i < 256; i++) {
- s16[5*i] = s16[5*i+1] = s16[5*i+2] = s16[5*i+3] = 0;
- s16[5*i+4] = convert (f[i]);
- }
- return 5*256;
- }
- static int a52_resample_MONO_to_1_C(float * _f, int16_t * s16){
- int i;
- int32_t * f = (int32_t *) _f;
- for (i = 0; i < 256; i++) {
- s16[i] = convert (f[i]);
- }
- return 1*256;
- }
- static int a52_resample_STEREO_to_2_C(float * _f, int16_t * s16){
- int i;
- int32_t * f = (int32_t *) _f;
- for (i = 0; i < 256; i++) {
- s16[2*i] = convert (f[i]);
- s16[2*i+1] = convert (f[i+256]);
- }
- return 2*256;
- }
- static int a52_resample_3F_to_5_C(float * _f, int16_t * s16){
- int i;
- int32_t * f = (int32_t *) _f;
- for (i = 0; i < 256; i++) {
- s16[5*i] = convert (f[i]);
- s16[5*i+1] = convert (f[i+512]);
- s16[5*i+2] = s16[5*i+3] = 0;
- s16[5*i+4] = convert (f[i+256]);
- }
- return 5*256;
- }
- static int a52_resample_2F_2R_to_4_C(float * _f, int16_t * s16){
- int i;
- int32_t * f = (int32_t *) _f;
- for (i = 0; i < 256; i++) {
- s16[4*i] = convert (f[i]);
- s16[4*i+1] = convert (f[i+256]);
- s16[4*i+2] = convert (f[i+512]);
- s16[4*i+3] = convert (f[i+768]);
- }
- return 4*256;
- }
- static int a52_resample_3F_2R_to_5_C(float * _f, int16_t * s16){
- int i;
- int32_t * f = (int32_t *) _f;
- for (i = 0; i < 256; i++) {
- s16[5*i] = convert (f[i]);
- s16[5*i+1] = convert (f[i+512]);
- s16[5*i+2] = convert (f[i+768]);
- s16[5*i+3] = convert (f[i+1024]);
- s16[5*i+4] = convert (f[i+256]);
- }
- return 5*256;
- }
- static int a52_resample_MONO_LFE_to_6_C(float * _f, int16_t * s16){
- int i;
- int32_t * f = (int32_t *) _f;
- for (i = 0; i < 256; i++) {
- s16[6*i] = s16[6*i+1] = s16[6*i+2] = s16[6*i+3] = 0;
- s16[6*i+4] = convert (f[i+256]);
- s16[6*i+5] = convert (f[i]);
- }
- return 6*256;
- }
- static int a52_resample_STEREO_LFE_to_6_C(float * _f, int16_t * s16){
- int i;
- int32_t * f = (int32_t *) _f;
- for (i = 0; i < 256; i++) {
- s16[6*i] = convert (f[i+256]);
- s16[6*i+1] = convert (f[i+512]);
- s16[6*i+2] = s16[6*i+3] = s16[6*i+4] = 0;
- s16[6*i+5] = convert (f[i]);
- }
- return 6*256;
- }
- static int a52_resample_3F_LFE_to_6_C(float * _f, int16_t * s16){
- int i;
- int32_t * f = (int32_t *) _f;
- for (i = 0; i < 256; i++) {
- s16[6*i] = convert (f[i+256]);
- s16[6*i+1] = convert (f[i+768]);
- s16[6*i+2] = s16[6*i+3] = 0;
- s16[6*i+4] = convert (f[i+512]);
- s16[6*i+5] = convert (f[i]);
- }
- return 6*256;
- }
- static int a52_resample_2F_2R_LFE_to_6_C(float * _f, int16_t * s16){
- int i;
- int32_t * f = (int32_t *) _f;
- for (i = 0; i < 256; i++) {
- s16[6*i] = convert (f[i+256]);
- s16[6*i+1] = convert (f[i+512]);
- s16[6*i+2] = convert (f[i+768]);
- s16[6*i+3] = convert (f[i+1024]);
- s16[6*i+4] = 0;
- s16[6*i+5] = convert (f[i]);
- }
- return 6*256;
- }
- static int a52_resample_3F_2R_LFE_to_6_C(float * _f, int16_t * s16){
- int i;
- int32_t * f = (int32_t *) _f;
- for (i = 0; i < 256; i++) {
- s16[6*i] = convert (f[i+256]);
- s16[6*i+1] = convert (f[i+768]);
- s16[6*i+2] = convert (f[i+1024]);
- s16[6*i+3] = convert (f[i+1280]);
- s16[6*i+4] = convert (f[i+512]);
- s16[6*i+5] = convert (f[i]);
- }
- return 6*256;
- }
- static void* a52_resample_C(int flags, int ch){
- switch (flags) {
- case A52_MONO:
- if(ch==5) return a52_resample_MONO_to_5_C;
- if(ch==1) return a52_resample_MONO_to_1_C;
- break;
- case A52_CHANNEL:
- case A52_STEREO:
- case A52_DOLBY:
- if(ch==2) return a52_resample_STEREO_to_2_C;
- break;
- case A52_3F:
- if(ch==5) return a52_resample_3F_to_5_C;
- break;
- case A52_2F2R:
- if(ch==4) return a52_resample_2F_2R_to_4_C;
- break;
- case A52_3F2R:
- if(ch==5) return a52_resample_3F_2R_to_5_C;
- break;
- case A52_MONO | A52_LFE:
- if(ch==6) return a52_resample_MONO_LFE_to_6_C;
- break;
- case A52_CHANNEL | A52_LFE:
- case A52_STEREO | A52_LFE:
- case A52_DOLBY | A52_LFE:
- if(ch==6) return a52_resample_STEREO_LFE_to_6_C;
- break;
- case A52_3F | A52_LFE:
- if(ch==6) return a52_resample_3F_LFE_to_6_C;
- break;
- case A52_2F2R | A52_LFE:
- if(ch==6) return a52_resample_2F_2R_LFE_to_6_C;
- break;
- case A52_3F2R | A52_LFE:
- if(ch==6) return a52_resample_3F_2R_LFE_to_6_C;
- break;
- }
- return NULL;
- }