1 #ifndef SINE_SOURCE_H_ 2 3 #define SINE_SOURCE_H_ 4 5 #include <media/MediaSource.h> 6 #include <utils/Compat.h> 7 8 namespace android { 9 10 class MediaBufferGroup; 11 12 struct SineSource : public MediaSource { 13 SineSource(int32_t sampleRate, int32_t numChannels); 14 15 virtual status_t start(MetaData *params); 16 virtual status_t stop(); 17 18 virtual sp<MetaData> getFormat(); 19 20 virtual status_t read( 21 MediaBufferBase **out, const ReadOptions *options = NULL); 22 23 protected: 24 virtual ~SineSource(); 25 26 private: 27 enum { kBufferSize = 8192 }; 28 static const CONSTEXPR double kFrequency = 500.0; 29 30 bool mStarted; 31 int32_t mSampleRate; 32 int32_t mNumChannels; 33 size_t mPhase; 34 35 MediaBufferGroup *mGroup; 36 }; 37 38 } // namespace android 39 40 #endif // SINE_SOURCE_H_ 41
