vrshoot
annotate src/audio/stream.h @ 0:b2f14e535253
initial commit
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Sat, 01 Feb 2014 19:58:19 +0200 |
| parents | |
| children |
| rev | line source |
|---|---|
| nuclear@0 | 1 #ifndef STREAM_H_ |
| nuclear@0 | 2 #define STREAM_H_ |
| nuclear@0 | 3 |
| nuclear@0 | 4 #include <pthread.h> |
| nuclear@0 | 5 |
| nuclear@0 | 6 #define AUDIO_FFT_BINS 16 |
| nuclear@0 | 7 #define AUDIO_FFT_DOWNSAMPLE 1 |
| nuclear@0 | 8 |
| nuclear@0 | 9 #define AUDIO_NUM_BUFFERS 8 |
| nuclear@0 | 10 #define AUDIO_BUFFER_MSEC 32 |
| nuclear@0 | 11 // TODO should the sampling rate be hardcoded? |
| nuclear@0 | 12 #define AUDIO_BUFFER_SAMPLES (AUDIO_BUFFER_MSEC * 44100 / 1000) |
| nuclear@0 | 13 // TODO unhardcode the channels number |
| nuclear@0 | 14 #define AUDIO_BUFFER_BYTES (AUDIO_BUFFER_SAMPLES * 2 * 2) |
| nuclear@0 | 15 |
| nuclear@0 | 16 #define AUDIO_FFT_SAMPLES (AUDIO_BUFFER_SAMPLES / AUDIO_FFT_DOWNSAMPLE) |
| nuclear@0 | 17 |
| nuclear@0 | 18 enum AUDIO_PLAYMODE |
| nuclear@0 | 19 { |
| nuclear@0 | 20 AUDIO_PLAYMODE_ONCE, |
| nuclear@0 | 21 AUDIO_PLAYMODE_LOOP |
| nuclear@0 | 22 }; |
| nuclear@0 | 23 |
| nuclear@0 | 24 struct AudioStreamBuffer { |
| nuclear@0 | 25 char samples[AUDIO_BUFFER_BYTES]; |
| nuclear@0 | 26 |
| nuclear@0 | 27 int num_samples; |
| nuclear@0 | 28 int channels; |
| nuclear@0 | 29 int sample_rate; |
| nuclear@0 | 30 }; |
| nuclear@0 | 31 |
| nuclear@0 | 32 struct FFTState; |
| nuclear@0 | 33 |
| nuclear@0 | 34 class AudioStream { |
| nuclear@0 | 35 private: |
| nuclear@0 | 36 pthread_t play_thread; |
| nuclear@0 | 37 pthread_mutex_t mutex; |
| nuclear@0 | 38 |
| nuclear@0 | 39 float volume; |
| nuclear@0 | 40 bool done, loop; |
| nuclear@0 | 41 unsigned int poll_interval; |
| nuclear@0 | 42 unsigned int alsrc; |
| nuclear@0 | 43 |
| nuclear@0 | 44 int *freqhist; // this will always point to the fft of the currently playing buffer |
| nuclear@0 | 45 |
| nuclear@0 | 46 bool use_fft; |
| nuclear@0 | 47 |
| nuclear@0 | 48 virtual bool more_samples(AudioStreamBuffer *buf) = 0; |
| nuclear@0 | 49 virtual void calc_freq(AudioStreamBuffer *buf, int *bins, FFTState *fft); |
| nuclear@0 | 50 |
| nuclear@0 | 51 public: |
| nuclear@0 | 52 void poll_loop(); |
| nuclear@0 | 53 |
| nuclear@0 | 54 AudioStream(); |
| nuclear@0 | 55 virtual ~AudioStream(); |
| nuclear@0 | 56 |
| nuclear@0 | 57 virtual void enable_fft(); |
| nuclear@0 | 58 virtual void disable_fft(); |
| nuclear@0 | 59 virtual bool is_fft_enabled() const; |
| nuclear@0 | 60 |
| nuclear@0 | 61 virtual bool open(const char *fname); |
| nuclear@0 | 62 virtual void close(); |
| nuclear@0 | 63 |
| nuclear@0 | 64 virtual void set_volume(float vol); |
| nuclear@0 | 65 virtual float get_volume() const; |
| nuclear@0 | 66 |
| nuclear@0 | 67 virtual void play(AUDIO_PLAYMODE mode); |
| nuclear@0 | 68 virtual void stop(); |
| nuclear@0 | 69 |
| nuclear@0 | 70 virtual void rewind() = 0; |
| nuclear@0 | 71 |
| nuclear@0 | 72 virtual int freq_count(int bin) const; |
| nuclear@0 | 73 virtual float freq_normalized(int bin) const; |
| nuclear@0 | 74 |
| nuclear@0 | 75 // frequency range in hertz |
| nuclear@0 | 76 virtual int freq_count(int range_start, int range_end) const; |
| nuclear@0 | 77 }; |
| nuclear@0 | 78 |
| nuclear@0 | 79 #endif // AUDIO_STREAM_H_ |