/* reopen ALSA PCM */
static int
alsa_reopen(struct snd_format* f) {
/* remember the current position */
output_time_offset += (alsa_hw_written * 1000) / outputf->bps;
alsa_hw_written = 0;
alsa_close_pcm();
return alsa_setup(f);
}
void sound_setup(int rate, int outp)
{
switch (outp) {
case ALSA:
alsa_setup(rate);
break;
case DSP:
dsp_setup(rate);
break;
case STDOUT:
stdout_setup(rate);
break;
default:
fprintf(stderr, "Unknown output method\n");
}
}
/* open callback */
int
alsa_open(int rate, int nch, int width) {
inputf = snd_format_alloc(rate, nch);
if(alsa_setup(inputf) < 0) {
alsa_close();
return 0;
}
output_time_offset = 0;
alsa_total_written = alsa_hw_written = 0;
going = true;
prebuffer = true;
remove_prebuffer = false;
thread_buffer_size =
(u_int) alsa_cb.thread_buffer_time * inputf->bps / 1000;
if(thread_buffer_size < hw_buffer_size)
thread_buffer_size = hw_buffer_size * 2;
if(thread_buffer_size < width)
thread_buffer_size = width;
prebuffer_size = thread_buffer_size / 2;
if(prebuffer_size < width)
prebuffer_size = width;
thread_buffer_size += hw_buffer_size;
thread_buffer_size -= thread_buffer_size % hw_period_size;
thread_buffer = calloc(1, thread_buffer_size);
wr_index = rd_index = 0;
flush_request = -1;
pthread_create(&audio_thread, NULL, alsa_loop, NULL);
return 1;
}
