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static Uint8 *audio_chunk;
static Uint32 audio_len;
static Uint8 *audio_pos;
void fill_audio(void *udata,Uint8 *stream,int len){
//SDL
long diff=time.elapsed();
qDebug("time is:%ld the len %d",diff,len);
SDL_memset(stream, 0, len);
if(audio_len==0) /* Only play if we have data left */
return;
len=(len>audio_len?audio_len:len); /* Mix as much data as possible */
SDL_MixAudio(stream,audio_pos,len,SDL_MIX_MAXVOLUME);
audio_pos += len;
audio_len -= len;
}
int main_loop_pcmfile(void *window)
{
SDL_AudioSpec wanted_spec;
wanted_spec.freq = 44100;
wanted_spec.format = AUDIO_S16SYS;
wanted_spec.channels = 2;
wanted_spec.silence = 0;
wanted_spec.samples = 1024;
wanted_spec.callback = fill_audio;
if (SDL_OpenAudio(&wanted_spec, NULL)<0){
qDebug("can't open audio");
return -1;
}
FILE *fp=fopen("out.pcm","rb+");
if(fp==NULL){
printf("cannot open this file\n");
return -1;
}
int pcm_buffer_size=4096;
char *pcm_buffer=(char *)malloc(pcm_buffer_size);
int data_count=0;
time.start();
while(1){
if (fread(pcm_buffer, 1, pcm_buffer_size, fp) != pcm_buffer_size){
// Loop
fseek(fp, 0, SEEK_SET);
fread(pcm_buffer, 1, pcm_buffer_size, fp);
data_count=0;
}
audio_len =pcm_buffer_size;
audio_pos = (Uint8 *) pcm_buffer;
//Play
SDL_PauseAudio(0);
while(audio_len>0)//Wait until finish
SDL_Delay(1);
}
}