nuclear@0: #ifndef STREAM_H_
nuclear@0: #define STREAM_H_
nuclear@0: 
nuclear@0: #include <pthread.h>
nuclear@0: 
nuclear@0: #define AUDIO_FFT_BINS			16
nuclear@0: #define AUDIO_FFT_DOWNSAMPLE	1
nuclear@0: 
nuclear@0: #define AUDIO_NUM_BUFFERS		8
nuclear@0: #define AUDIO_BUFFER_MSEC		32
nuclear@0: // TODO should the sampling rate be hardcoded?
nuclear@0: #define AUDIO_BUFFER_SAMPLES	(AUDIO_BUFFER_MSEC * 44100 / 1000)
nuclear@0: // TODO unhardcode the channels number
nuclear@0: #define AUDIO_BUFFER_BYTES		(AUDIO_BUFFER_SAMPLES * 2 * 2)
nuclear@0: 
nuclear@0: #define AUDIO_FFT_SAMPLES		(AUDIO_BUFFER_SAMPLES / AUDIO_FFT_DOWNSAMPLE)
nuclear@0: 
nuclear@0: enum AUDIO_PLAYMODE
nuclear@0: {
nuclear@0: 	AUDIO_PLAYMODE_ONCE,
nuclear@0: 	AUDIO_PLAYMODE_LOOP
nuclear@0: };
nuclear@0: 
nuclear@0: struct AudioStreamBuffer {
nuclear@0: 	char samples[AUDIO_BUFFER_BYTES];
nuclear@0: 
nuclear@0: 	int num_samples;
nuclear@0: 	int channels;
nuclear@0: 	int sample_rate;
nuclear@0: };
nuclear@0: 
nuclear@0: struct FFTState;
nuclear@0: 
nuclear@0: class AudioStream {
nuclear@0: private:
nuclear@0: 	pthread_t play_thread;
nuclear@0: 	pthread_mutex_t mutex;
nuclear@0: 
nuclear@0: 	float volume;
nuclear@0: 	bool done, loop;
nuclear@0: 	unsigned int poll_interval;
nuclear@0: 	unsigned int alsrc;
nuclear@0: 
nuclear@0: 	int *freqhist;	// this will always point to the fft of the currently playing buffer
nuclear@0: 
nuclear@0: 	bool use_fft;
nuclear@0: 
nuclear@0: 	virtual bool more_samples(AudioStreamBuffer *buf) = 0;
nuclear@0: 	virtual void calc_freq(AudioStreamBuffer *buf, int *bins, FFTState *fft);
nuclear@0: 
nuclear@0: public:
nuclear@0: 	void poll_loop();
nuclear@0: 
nuclear@0: 	AudioStream();
nuclear@0: 	virtual ~AudioStream();
nuclear@0: 
nuclear@0: 	virtual void enable_fft();
nuclear@0: 	virtual void disable_fft();
nuclear@0: 	virtual bool is_fft_enabled() const;
nuclear@0: 
nuclear@0: 	virtual bool open(const char *fname);
nuclear@0: 	virtual void close();
nuclear@0: 
nuclear@0: 	virtual void set_volume(float vol);
nuclear@0: 	virtual float get_volume() const;
nuclear@0: 
nuclear@0: 	virtual void play(AUDIO_PLAYMODE mode);
nuclear@0: 	virtual void stop();
nuclear@0: 
nuclear@0: 	virtual void rewind() = 0;
nuclear@0: 
nuclear@0: 	virtual int freq_count(int bin) const;
nuclear@0: 	virtual float freq_normalized(int bin) const;
nuclear@0: 
nuclear@0: 	// frequency range in hertz
nuclear@0: 	virtual int freq_count(int range_start, int range_end) const;
nuclear@0: };
nuclear@0: 
nuclear@0: #endif  // AUDIO_STREAM_H_