sdl play .pcm

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#include <iostream> #include <SDL.h>   static Uint8 *pAudio_chunk; static Uint32 audio_len; static Uint8 *pAudio_pos;   void fill_audio_buffer(void *userdata, Uint8 * stream, int len) {     SDL_memset(stream, 0, len);     // 判断是否有读到数据     if (audio_len == 0)         return;       len = (len > audio_len ? audio_len : len);     SDL_MixAudio(stream, pAudio_pos, len, SDL_MIX_MAXVOLUME);     pAudio_pos += len;     audio_len -= len; }   int SDL_main(int argc, char *argv[]) //int main(int argc, char *argv[]) {         /*** 初始化SDL ***/     if (SDL_Init(SDL_INIT_AUDIO | SDL_INIT_TIMER))     {         printf("Initialize SDL failed: %s\n", SDL_GetError());         return -1;     }     /****************/       /*** 初始化初始化SDL_AudioSpec结构体 ***/     SDL_AudioSpec audioSpec;       // 音频数据的采样率。常用的有48000，44100等     audioSpec.freq = 48000;       // 音频数据的格式     audioSpec.format = AUDIO_F32LSB;       // 声道数。例如单声道取值为1，立体声取值为2     audioSpec.channels = 2;       // 设置静音的值     audioSpec.silence = 0;       // 音频缓冲区中的采样个数，要求必须是2的n次方     audioSpec.samples = 1024;       // 填充音频缓冲区的回调函数     audioSpec.callback = fill_audio_buffer;     /************************************/       // 打开音频设备     if (SDL_OpenAudio(&audioSpec, nullptr) < 0)     {         printf("Can not open audio!");         return -1;     }       FILE *pAudioFile = fopen("D:/out.pcm", "rb+");     if (pAudioFile == nullptr)     {         printf("Can not open audio file!");         return -1;     }       int pcm_buffer_size = 48000;     char *pcm_buffer = (char *)malloc(pcm_buffer_size);     int data_count = 0;       SDL_PauseAudio(0);       for (;;)     {         // 循环播放         if (fread(pcm_buffer, 1, pcm_buffer_size, pAudioFile) != pcm_buffer_size)         {             fseek(pAudioFile, 0, SEEK_SET);             fread(pcm_buffer, 1, pcm_buffer_size, pAudioFile);             data_count = 0;         }         printf("Playing %10d Bytes data.\n", data_count);         data_count += pcm_buffer_size;           pAudio_chunk = (Uint8 *)pcm_buffer;         audio_len = pcm_buffer_size;         pAudio_pos = pAudio_chunk;           while (audio_len > 0)             SDL_Delay(0);     }     free(pcm_buffer);     SDL_Quit();       return 0; }

 

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