ALSA(unsigned channels, unsigned samplerate, const std::string& device = "default") : runnable(true), pcm(nullptr), params(nullptr), fps(samplerate)
{
int rc = snd_pcm_open(&pcm, device.c_str(), SND_PCM_STREAM_PLAYBACK, 0);
if (rc < 0)
{
runnable = false;
throw DeviceException(General::join("Unable to open PCM device ", snd_strerror(rc)));
}
snd_pcm_format_t fmt = type_to_format(T());
if (snd_pcm_hw_params_malloc(¶ms) < 0)
{
runnable = false;
throw DeviceException("Failed to allocate memory.");
}
runnable = false;
if (
(snd_pcm_hw_params_any(pcm, params) < 0) ||
(snd_pcm_hw_params_set_access(pcm, params, SND_PCM_ACCESS_RW_INTERLEAVED) < 0) ||
(snd_pcm_hw_params_set_channels(pcm, params, channels) < 0) ||
(snd_pcm_hw_params_set_format(pcm, params, fmt) < 0) ||
(snd_pcm_hw_params_set_rate(pcm, params, samplerate, 0) < 0) ||
((rc = snd_pcm_hw_params(pcm, params)) < 0)
)
throw DeviceException(General::join("Unable to install HW params: ", snd_strerror(rc)));
runnable = true;
}
impl(const char* app, const char* name, const pcm_format& fmt) : fmt_(fmt)
{
pa_sample_spec ss = {};
ss.format = type_to_format(fmt.type);
ss.rate = fmt.rate;
ss.channels = fmt.channels;
int error;
handle_ = ::pa_simple_new(
0, app, PA_STREAM_PLAYBACK, 0, name, &ss, 0, 0, &error);
if (handle_ == 0)
throw BOOST_IOSTREAMS_FAILURE("pa_simple_new() failed");
}
