Greetings,

I'm a new user of alsa api and I need to play pcm, adpcm and wav files using Alsa api. My code is below. I did a test with pcm file and the sound is playing very fast, the properties of the pcm file are 128kbps, 16 bits little endian, 1 channel, 8 khz, but I don't know how to set correctly the parameters in api. Please help me with this problem. Point me my errors.

Thanks,

Flavio

int Sound::PlayFile(char *pszFileName, ULONG initialPoint, UINT qtdTimesToPlay, BOOL mix) { int dir; int result; int size; unsigned int val; snd_pcm_hw_params_t *params; snd_pcm_uframes_t frames; char* buffer; long tamanhoBuffer; FILE* file; int bytesLidos;

// Open PCM device for playback. if((result = snd_pcm_open(&handleSound,"hw:0,0",SND_PCM_STREAM_PLAYBACK,0)) < 0) { fprintf(stderr,"\nUnable to open pcm device: %s",snd_strerror(result)); exit(1); }

// Allocate a hardware parameters object. snd_pcm_hw_params_alloca(&hardwareParam); // Fill it in with default values. snd_pcm_hw_params_any(handleSound,hardwareParam); // Set the desired hardware parameters. // Interleaved mode. snd_pcm_hw_params_set_access(handleSound,hardwareParam,SND_PCM_ACCESS_RW_INTERLEAVED); // Signed 16-bit little-endian format. snd_pcm_hw_params_set_format(handleSound,hardwareParam,SND_PCM_FORMAT_S16_LE); // Two channels (stereo), one channel mono. snd_pcm_hw_params_set_channels(handleSound,hardwareParam,1); // Set rate. //snd_pcm_hw_params_set_rate(handleSound,hardwareParam,8000,0); // Set period size to 16384 frames. //snd_pcm_hw_params_set_period_size(handleSound,hardwareParam,16384,0); // Write the parameters to the driver. if((result = snd_pcm_hw_params(handleSound,hardwareParam)) < 0) { fprintf(stderr,"\nUnable to set hw parameters: %s",snd_strerror(result)); exit(1); }

tamanhoBuffer = 16384; if((result = snd_pcm_prepare(handleSound)) < 0) { fprintf(stderr,"Cannot prepare audio interface for use: %s\n",snd_strerror(result)); exit(1); } file = fopen(pszFileName,"rb"); buffer = (char *)malloc(tamanhoBuffer); while((bytesLidos = fread(buffer,1,tamanhoBuffer,file)) > 0) { if((result = snd_pcm_writei(handleSound,buffer,tamanhoBuffer)) != tamanhoBuffer) { fprintf(stderr,"Write to audio interface failed: %s\n",snd_strerror(result)); exit(1); } }

snd_pcm_drain(handleSound); snd_pcm_close(handleSound); free(buffer); fclose(file);

return OK; }

__________________________________________________ Fale com seus amigos de graça com o novo Yahoo! Messenger http://br.messenger.yahoo.com/