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/*
Copyright (C) 2005-2009 Michel de Boer <michel@twinklephone.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef _AUDIO_DEVICE_H
#define _AUDIO_DEVICE_H
#include <string>
#include "twinkle_config.h"
using namespace std;
#ifndef _SYS_SETTINGS_H
class t_audio_device;
#endif
enum t_audio_sampleformat {
SAMPLEFORMAT_U8,
SAMPLEFORMAT_S8,
SAMPLEFORMAT_S16,
SAMPLEFORMAT_U16
};
class t_audio_io {
public:
virtual ~t_audio_io();
virtual void enable(bool enable_playback, bool enable_recording) = 0;
virtual void flush(bool playback_buffer, bool recording_buffer) = 0;
// Returns the number of bytes that can be written/read without blocking
virtual int get_buffer_space(bool is_recording_buffer) = 0;
// Returns the size of the hardware buffer
virtual int get_buffer_size(bool is_recording_buffer) = 0;
/** Check if a play buffer underrun occurred. */
virtual bool play_buffer_underrun(void) = 0;
virtual int read(unsigned char* buf, int len) = 0;
virtual int write(const unsigned char* buf, int len) = 0;
virtual int get_sample_rate(void) const;
static t_audio_io* open(const t_audio_device& dev, bool playback,
bool capture, bool blocking, int channels, t_audio_sampleformat format,
int sample_rate, bool short_latency);
// Validate if an audio device can be opened.
static bool validate(const t_audio_device& dev, bool playback, bool capture);
protected:
virtual bool open(const string& device, bool playback, bool capture,
bool blocking, int channels, t_audio_sampleformat format,
int sample_rate, bool short_latency);
private:
int _sample_rate;
};
class t_oss_io : public t_audio_io {
public:
t_oss_io();
virtual ~t_oss_io();
void enable(bool enable_playback, bool enable_recording);
void flush(bool playback_buffer, bool recording_buffer);
int get_buffer_space(bool is_recording_buffer);
int get_buffer_size(bool is_recording_buffer);
bool play_buffer_underrun(void);
int read(unsigned char* buf, int len);
int write(const unsigned char* buf, int len);
protected:
bool open(const string& device, bool playback, bool capture, bool blocking,
int channels, t_audio_sampleformat format, int sample_rate,
bool short_latency);
private:
int fd;
int play_buffersize, rec_buffersize;
};
#ifdef HAVE_LIBASOUND
class t_alsa_io : public t_audio_io {
public:
t_alsa_io();
virtual ~t_alsa_io();
void enable(bool enable_playback, bool enable_recording);
void flush(bool playback_buffer, bool recording_buffer);
int get_buffer_space(bool is_recording_buffer);
int get_buffer_size(bool is_recording_buffer);
bool play_buffer_underrun(void);
int read(unsigned char* buf, int len);
int write(const unsigned char* buf, int len);
protected:
bool open(const string& device, bool playback, bool capture, bool blocking,
int channels, t_audio_sampleformat format, int sample_rate,
bool short_latency);
private:
struct _snd_pcm *pcm_play_ptr, *pcm_rec_ptr;
int play_framesize, rec_framesize;
int play_buffersize, rec_buffersize;
int play_periods, rec_periods;
bool short_latency;
// snd_pcm_delay should return the number of bytes in the buffer.
// For some reason however, if the capture device is a software mixer,
// it returns inaccurate values.
// This flag if the functionality is broken.
bool rec_delay_broken;
// Indicates if snd_pcm_pause works for this device
bool can_pause;
};
#endif
#endif
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