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ALSADevices.hpp
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ALSADevices.hpp
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#ifndef __ALSADevices_H
#define __ALSADevices_H
#define ALSA_PCM_NEW_HW_PARAMS_API
#include <alsa/asoundlib.h>
#include <string>
class ALSAPCMDevice {
protected:
snd_pcm_t* handle;
std::string device_name;
unsigned int sample_rate, channels; // Quality of the recorded audio.
snd_pcm_uframes_t frames_per_period; // Latency - lower numbers will decrease latency and increase CPU usage.
snd_pcm_format_t format; // Bit depth - Quality.
enum _snd_pcm_stream type; // SND_PCM_STREAM_CAPTURE | SND_PCM_STREAM_PLAYBACK
void set_hw_params();
public:
ALSAPCMDevice(
std::string device_name,
unsigned int sample_rate,
unsigned int channels,
unsigned int frames_per_period,
snd_pcm_format_t format,
enum _snd_pcm_stream type
) :
device_name(device_name),
sample_rate(sample_rate),
channels(channels),
frames_per_period(frames_per_period),
format(format),
type(type)
{}
bool open();
void close();
char* allocate_buffer();
unsigned int get_frames_per_period();
unsigned int get_bytes_per_frame();
};
class ALSACaptureDevice : public ALSAPCMDevice {
public:
ALSACaptureDevice(
std::string device_name,
unsigned int sample_rate,
unsigned int channels,
unsigned int frames_per_period,
snd_pcm_format_t format
) : ALSAPCMDevice( // Calling super constructor
device_name,
sample_rate,
channels,
frames_per_period,
format,
SND_PCM_STREAM_CAPTURE) // This is the param that makes this a readable - CAPTURE - device.
{}
unsigned int capture_into_buffer(char* buffer, snd_pcm_uframes_t frames_to_capture);
};
class ALSAPlaybackDevice : public ALSAPCMDevice {
public:
ALSAPlaybackDevice(
std::string device_name,
unsigned int sample_rate,
unsigned int channels,
unsigned int frames_per_period,
snd_pcm_format_t format
) : ALSAPCMDevice( // Calling super constructor
device_name,
sample_rate,
channels,
frames_per_period,
format,
SND_PCM_STREAM_PLAYBACK) // This is the param that makes this a readable - CAPTURE - device.
{}
unsigned int play_from_buffer(char* buffer, snd_pcm_uframes_t frames_to_play);
};
#endif