AsyncAudioStreamStateDetector.h
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00029 #ifndef ASYNC_AUDIO_STREAM_STATE_DETECTOR_INCLUDED
00030 #define ASYNC_AUDIO_STREAM_STATE_DETECTOR_INCLUDED
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00039 #include <sigc++/sigc++.h>
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00048 #include <AsyncAudioPassthrough.h>
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00073 namespace Async
00074 {
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00111 class AudioStreamStateDetector : public AudioPassthrough, public SigC::Object
00112 {
00113 public:
00117 AudioStreamStateDetector(void) : stream_state(STREAM_IDLE) {}
00118
00122 virtual ~AudioStreamStateDetector(void) {}
00123
00135 virtual int writeSamples(const float *samples, int count)
00136 {
00137 if (stream_state != STREAM_ACTIVE)
00138 {
00139 stream_state = STREAM_ACTIVE;
00140 sigStreamStateChanged(true, false);
00141 }
00142 return AudioPassthrough::writeSamples(samples, count);
00143 }
00144
00153 virtual void flushSamples(void)
00154 {
00155 if (stream_state != STREAM_FLUSHING)
00156 {
00157 stream_state = STREAM_FLUSHING;
00158 sigStreamStateChanged(false, false);
00159 }
00160 AudioPassthrough::flushSamples();
00161 }
00162
00170 virtual void allSamplesFlushed(void)
00171 {
00172 if (stream_state != STREAM_IDLE)
00173 {
00174 stream_state = STREAM_IDLE;
00175 sigStreamStateChanged(false, true);
00176 }
00177 AudioPassthrough::allSamplesFlushed();
00178 }
00179
00184 bool isIdle(void) const { return (stream_state == STREAM_IDLE); }
00185
00191 bool isActive(void) const { return (stream_state == STREAM_ACTIVE); }
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00198 bool isFlushing(void) const { return (stream_state == STREAM_FLUSHING); }
00199
00205 SigC::Signal2<void, bool, bool> sigStreamStateChanged;
00206
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00208 private:
00209 AudioStreamStateDetector(const AudioStreamStateDetector&);
00210 AudioStreamStateDetector& operator=(const AudioStreamStateDetector&);
00211
00212 typedef enum
00213 {
00214 STREAM_IDLE, STREAM_ACTIVE, STREAM_FLUSHING
00215 } StreamState;
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00217 StreamState stream_state;
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00219 };
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00222 }
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00224 #endif
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