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play.c
108 lines (93 loc) · 3.01 KB
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play.c
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#define ALSA_PCM_NEW_HW_PARAMS_API
#include <alsa/asoundlib.h>
#include <stdio.h>
int main() {
long loops;
int rc,j = 0;
int size;
snd_pcm_t *handle;
snd_pcm_hw_params_t *params;
unsigned int val,val2;
int dir;
snd_pcm_uframes_t frames;
char *buffer;
FILE *fp ;
if( (fp = fopen("sound.wav","r")) < 0)//南拳妈妈 - 你不像她.wav
printf("open sound.wav fial\n");
if(fseek(fp,0,SEEK_SET) < 0)
printf("put fp start to first error\n ");
/* Open PCM device for playback. */
rc = snd_pcm_open(&handle, "default",
SND_PCM_STREAM_PLAYBACK, 0);
if (rc < 0) {
fprintf(stderr, "unable to open pcm device: %s/n",
snd_strerror(rc));
exit(1);
}
/* Allocate a hardware parameters object. */
snd_pcm_hw_params_alloca(¶ms);
/* Fill it in with default values. */
snd_pcm_hw_params_any(handle, params);
/* Set the desired hardware parameters. */
/* Interleaved mode */
snd_pcm_hw_params_set_access(handle, params,
SND_PCM_ACCESS_RW_INTERLEAVED);
/* Signed 16-bit little-endian format */
snd_pcm_hw_params_set_format(handle, params,
SND_PCM_FORMAT_S16_LE);
/* Two channels (stereo) */
snd_pcm_hw_params_set_channels(handle, params, 1);
/* 44100 bits/second sampling rate (CD quality) */
val = 8000;
snd_pcm_hw_params_set_rate_near(handle, params,
&val, &dir);
/* Set period size to 32 frames. */
frames = 1024; //设置的值没有反应
snd_pcm_hw_params_set_period_size_near(handle, params, &frames, &dir); //
printf("frames is %d\n",(int)frames);
/* Write the parameters to the driver */
rc = snd_pcm_hw_params(handle, params);
if (rc < 0) {
fprintf(stderr, "unable to set hw parameters: %s/n", snd_strerror(rc));
exit(1);
}
/* Use a buffer large enough to hold one period */
snd_pcm_hw_params_get_period_size(params, &frames,
&dir);
size = frames * 2; /* 2 bytes/sample, 2 channels */
buffer = (char *) malloc(size);
/* We want to loop for 5 seconds */
snd_pcm_hw_params_get_period_time(params, &val, &dir);
/* 5 seconds in microseconds divided by * period time */
loops = 10000000 / val;
while (loops > 0) {
loops--;
rc = fread(buffer,1, size,fp);
//rc = read(0,buffer,size);
//printf("%d\n",j++);
if (rc == 0) {
fprintf(stderr, "end of file on input\n");
break;
} else if (rc != size) {
fprintf(stderr, "short read: read %d bytes\n", rc);
}
//else printf("fread to buffer success\n");
rc = snd_pcm_writei(handle, buffer, frames);
if (rc == -EPIPE) {
/* EPIPE means underrun */
fprintf(stderr, "underrun occurred\n");
snd_pcm_prepare(handle);
} else if (rc < 0) {
fprintf(stderr, "error from writei: %s\n",
snd_strerror(rc));
} else if (rc != (int)frames) {
fprintf(stderr, "short write, write %d frames\n", rc);
}
}
/*******************************************************************/
snd_pcm_drain(handle);
snd_pcm_close(handle);
free(buffer);
fclose(fp);
return 0;
}