symbian 播放器源码

/** * * @brief Definition of CAudioPlayerEngine * * Copyright (c) EMCC Software Ltd 2003 * @version 1.0 */ #include "AudioPlayerEngine.h" #include <eikenv.h> #include <stringloader.h> #include <barsread.h> #include <aknutils.h> #include "AudioPlayer.rsg" #include "AudioPlayer.loc" _LIT(KToPlayFileWav, "\\Ring.wav"); _LIT(KToPlayFileMidi, "\\Fur-Elise.mid"); _LIT(KToPlayFileStream, "\\Stream.pcm"); const TInt KToneFrequency = 3000; const TInt KToneDuration = 4000000; const TInt KToneVolumeDenominator = 2; /** * C++ constructor */ CAudioPlayerEngine::CAudioPlayerEngine(MAudioPlayerEngineObserver& aObserver) :iObserver(aObserver), iState(EStopped) { } /** * Destructor. */ CAudioPlayerEngine::~CAudioPlayerEngine() { Stop(); } /** * Symbian OS 2 phase constructor. * Constructs the CAudioPlayerEngine popping * the constructed object from the CleanupStack before returning it. * * @param aRect The rectangle for this window * @return The newly constructed CAudioPlayerAppView */ CAudioPlayerEngine* CAudioPlayerEngine::NewL(MAudioPlayerEngineObserver& aObserver) { CAudioPlayerEngine* self = new (ELeave) CAudioPlayerEngine(aObserver); CleanupStack::PushL(self); self->ConstructL(); CleanupStack::Pop(self); return self; } /** * Symbian 2nd phase constructor. * Empty implementation */ void CAudioPlayerEngine::ConstructL() { } /** * MMdaAudioToneObserver derivation * This has been called as a result of NewL() being called on the tone player * the tone utility is now ready for playing * * @param aError Error code to inform us if preparation has successfully completed * */ void CAudioPlayerEngine::MatoPrepareComplete(TInt aError) { if (aError) { Stop(); } else { iPlayerTone->SetVolume(iPlayerTone->MaxVolume() / KToneVolumeDenominator); iPlayerTone->Play(); } } /** * MMdaAudioToneObserver derivation * This is called when tone playing completes and informs the * MAudioPlayerEngineObserver playing has finished. * * @param aError Error code to inform us if playing has successfully completed */ void CAudioPlayerEngine::MatoPlayComplete(TInt /*aError*/) { iState = EStopped; delete iPlayerTone; iPlayerTone = NULL; TRAPD(err, iObserver.HandlePlayingStoppedL()); } /** * MMdaAudioPlayerCallback derivation * This has been called as a result of NewFilePlayerL() being called on the file player * the player utility is now ready for playing * * @param aError Status of the audio sample after initialization * @param aDuration Duration of the audio sample */ void CAudioPlayerEngine::MapcInitComplete(TInt aError, const TTimeIntervalMicroSeconds& /*aDuration*/) { if (aError == KErrNone) { iPlayerFile->SetVolume(iPlayerFile->MaxVolume() / KToneVolumeDenominator); iPlayerFile->Play(); } else { Stop(); } } /** * MMdaAudioPlayerCallback derivation * This has been called as a result of playing being completed * * @param aError Error code to inform if playing has successfully completed */ void CAudioPlayerEngine::MapcPlayComplete(TInt /*aError*/) { iState = EStopped; delete iPlayerFile; iPlayerFile = NULL; TRAPD(err, iObserver.HandlePlayingStoppedL());//播放完通知给了它的观察者VIEW // if (aError == KErrNone) // 　　{ // 　　iPlayerFile->Close(); /* Closes the current audio clip, so can allow another clip to be opened). */ // // 　　iPlayerFile->OpenFileL(_L("c:\data\Fur-Elise.mid")); /* 打开另一个音频文件并重复播放流程 */ // // 　　} // 　　else // // 　　{ // 　　iPlayerFile->Stop(); // 　　} } /** * MMdaAudioOutputStreamCallback derivation * This has been called as a result of NewL() being called on the stream player * in order to play the stream, we must 1st write the stream buffer to the client * once this has been done, the stream will begin playing automatically * * @param aError Error code to indicate if open succeeded */ void CAudioPlayerEngine::MaoscOpenComplete(TInt aError) { if (aError == KErrNone) { TRAPD(err, iPlayerStream->WriteL(*iStreamBuffer)); } else { Stop(); } } /** * This has been called in response to WriteL() being called on the stream player * or in response to Stop() being called on the stream player. in the latter case, * aError is equal to KErrAbort. * Otherwise, we add iStreamBuffer to the client queue, so that it will be repeated, * when the last buffer has finished * * @param aError Error code to indicate if copy was successful * @param aBuffer A reference to the descriptor that has been copied to the server */ void CAudioPlayerEngine::MaoscBufferCopied(TInt aError, const TDesC8& /*aBuffer*/) {//open完调用该回掉， if (aError == KErrNone) { TRAPD(err, iPlayerStream->WriteL(*iStreamBuffer))//完了后指向第一个没有写的数据 iPlayerStream->SetVolume(iPlayerStream->MaxVolume() / KToneVolumeDenominator); }//所有声音播放完后，MaoscPlayComplete(TInt /*aError*/)被回掉 } /** * Callback when playback finishes * * @param aError Error code indicates why playback was terminated */ void CAudioPlayerEngine::MaoscPlayComplete(TInt /*aError*/) { iState = EStopped; delete iPlayerStream; iPlayerStream = NULL; delete iStreamBuffer; iStreamBuffer = NULL; delete [] iStreamData; iStreamData = NULL; TRAPD(err, iObserver.HandlePlayingStoppedL()); } //PLAYER FUNCTIONS /** * Constructs the tone player; * This will lead to a call to MapcInitComplete() */ void CAudioPlayerEngine::PlayToneL() { iState = EPlaying; iPlayerTone = CMdaAudioToneUtility::NewL(*this); iPlayerTone->PrepareToPlayTone(KToneFrequency, TTimeIntervalMicroSeconds(KToneDuration));//以一定的频率发出声音 } /** * Constructs the file player; * This will lead to a call to MapcInitComplete() */ void CAudioPlayerEngine::PlayWavL() { TFileName wavFile(KToPlayFileWav); User::LeaveIfError(CompleteWithAppPath(wavFile)); iState = EPlaying; iPlayerFile = CMdaAudioPlayerUtility::NewFilePlayerL(wavFile, *this);//传this是观察者 } /** * Constructs the file player; * This will lead to a call to MapcInitComplete() * Note: playing midi files can only be supported on device; it is not supported under WINS */ void CAudioPlayerEngine::PlayMidiL() { #ifndef __WINS__ TFileName midiFile(KToPlayFileMidi); User::LeaveIfError(CompleteWithAppPath(midiFile)); iState = EPlaying; iPlayerFile = CMdaAudioPlayerUtility::NewFilePlayerL(midiFile, *this); #endif } /** * Constructs the stream player * This will lead to a call to MaoscOpenComplete() */ void CAudioPlayerEngine::PlayStreamL() { // open the file and load it into the buffers RFs fs; CleanupClosePushL(fs); // PUSH User::LeaveIfError(fs.Connect()); RFile file; CleanupClosePushL(file); // PUSH TFileName streamFile(KToPlayFileStream); User::LeaveIfError(CompleteWithAppPath(streamFile)); User::LeaveIfError(file.Open(fs, streamFile, EFileRead | EFileShareReadersOnly)); TInt fileSize = 0; file.Size(fileSize); iStreamData = new (ELeave) TUint8[fileSize]; iStreamBuffer = new (ELeave) TPtr8(iStreamData, fileSize, fileSize); file.Read(*iStreamBuffer); CleanupStack::PopAndDestroy(2); // file & fs iState = EPlaying; iPlayerStream = CMdaAudioOutputStream::NewL(*this); iPlayerStream->Open(&iStreamSettings); } /** * Stops whatever is playing and deletes the player */ void CAudioPlayerEngine::Stop() { if (iPlayerTone) { iPlayerTone->CancelPlay(); } if (iPlayerFile) { iPlayerFile->Stop(); } if (iPlayerStream) { iPlayerStream->Stop(); } delete iPlayerTone; iPlayerTone = NULL; delete iPlayerFile; iPlayerFile = NULL; delete iPlayerStream; iPlayerStream = NULL; delete iStreamBuffer; iStreamBuffer = NULL; delete [] iStreamData; iStreamData = NULL; iState = EStopped; }