C++ (Cpp) snd_pcm_playback_prepare Examples

Example #1

File: alsapmo.cpp Project: mayhem/freeamp

Error AlsaPMO::Reset(bool user_stop) {

    if (user_stop) 
        snd_pcm_playback_drain(m_handle);
    else
        snd_pcm_playback_flush(m_handle);

    snd_pcm_playback_prepare(m_handle);

    return kError_NoErr;
}

Example #2

int _alsa_write_buffer(ao_alsa_internal *s)
{
	snd_pcm_channel_status_t status;
	snd_pcm_t *pcm_handle = s->pcm_handle;
	int len = s->buf_end;
	ssize_t written, snd_pcm_write_ret;

	s->buf_end = 0;

	snd_pcm_write_ret = written = 0;
	while ((snd_pcm_write_ret >= 0) && (written < len)) {
		while ((snd_pcm_write_ret = snd_pcm_write(pcm_handle, s->buf, len)) == -EINTR)
			;
		if (snd_pcm_write_ret > 0)
			written += snd_pcm_write_ret;
	}

	memset(&status, 0, sizeof(status));
	if (snd_pcm_channel_status(pcm_handle, &status) < 0) {
		fprintf(stderr, "ALSA: could not get channel status\n");
		return 0;
	}       
	if (status.underrun) {
		/* fprintf(stderr, "ALSA: underrun. resetting channel\n"); */
		snd_pcm_channel_flush(pcm_handle, SND_PCM_CHANNEL_PLAYBACK);
		snd_pcm_playback_prepare(pcm_handle);
		snd_pcm_write(pcm_handle, s->buf, len);
		if (snd_pcm_channel_status(pcm_handle, &status) < 0) {
			fprintf(stderr, "ALSA: could not get channel status. giving up\n");
			return 0;
		}
		if (status.underrun) {
			fprintf(stderr, "ALSA: write error. giving up\n");
					return 0;
		}               
	}

	return 1;
}