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1、Android Multimedia 框架总结（二十二）MediaCodec 中 C+中创建到 start 过程及状态变换从今天开始，将深入源码中看看其 c+过程，看下 Agenda 如下：mediacodec.hCreateByTypeinitMediaCodec 中 BufferInfo 内部类：configure 过程startBufferInfo 在 MediaCodec.h 中对应是一个结构体/create by 逆流的鱼 yuiop on 2016/12/11/blog 地址：http:/ BufferInfo uint32_t mBufferID;sp mData;sp mEnc
2、ryptedData;sp mSharedEncryptedBuffer;sp mNotify;sp mFormat;bool mOwnedByClient;mediacodec.h 的方法的声明,位于frameworksavincludemediastagefright 下/create by 逆流的鱼 yuiop on 2016/12/11/blog 地址：http:/ android struct ABuffer;struct AMessage;struct AReplyToken;struct AString;struct CodecBase;struct IBatteryStats;
3、struct ICrypto;class IMemory;struct MemoryDealer;class IResourceManagerClient;class IResourceManagerService;struct PersistentSurface;struct SoftwareRenderer;struct Surface;struct MediaCodec : public AHandler enum ConfigureFlags CONFIGURE_FLAG_ENCODE = 1,;enum BufferFlags BUFFER_FLAG_SYNCFRAME = 1,BU
4、FFER_FLAG_CODECCONFIG = 2,BUFFER_FLAG_EOS = 4,;enum CB_INPUT_AVAILABLE = 1,CB_OUTPUT_AVAILABLE = 2,CB_ERROR = 3,CB_OUTPUT_FORMAT_CHANGED = 4,CB_RESOURCE_RECLAIMED = 5,;static const pid_t kNoPid = -1;static sp CreateByType(const sp &looper, const char *mime, bool encoder, status_t *err = NULL,pid_t p
5、id = kNoPid);static sp CreateByComponentName(const sp &looper, const char *name, status_t *err = NULL,pid_t pid = kNoPid);static sp CreatePersistentInputSurface();status_t configure(const sp &format,const sp &nativeWindow,const sp &crypto,uint32_t flags);status_t setCallback(const sp status_t setOnF
6、rameRenderedNotification(const sp status_t createInputSurface(sp* bufferProducer);status_t setInputSurface(const sp status_t start();/ Returns to a state in which the component remains allocated but/ unconfigured.status_t stop();/ Resets the codec to the INITIALIZED state. Can be called after an err
7、or/ has occured to make the codec usable.status_t reset();/ Client MUST call release before releasing final reference to this/ object. status_t release();status_t flush();status_t queueInputBuffer(size_t index,size_t offset,size_t size,int64_t presentationTimeUs,uint32_t flags,AString *errorDetailMs
8、g = NULL);status_t queueSecureInputBuffer(size_t index,size_t offset,const CryptoPlugin:SubSample *subSamples,size_t numSubSamples,const uint8_t key16,const uint8_t iv16,CryptoPlugin:Mode mode,int64_t presentationTimeUs,uint32_t flags,AString *errorDetailMsg = NULL);status_t dequeueInputBuffer(size_
9、t *index, int64_t timeoutUs = 0ll);status_t dequeueOutputBuffer(size_t *index,size_t *offset,size_t *size,int64_t *presentationTimeUs,uint32_t *flags,int64_t timeoutUs = 0ll);status_t renderOutputBufferAndRelease(size_t index, int64_t timestampNs);status_t renderOutputBufferAndRelease(size_t index);
10、status_t releaseOutputBuffer(size_t index);status_t signalEndOfInputStream();status_t getOutputFormat(sp *format) const;status_t getInputFormat(sp *format) const;status_t getWidevineLegacyBuffers(Vector *buffers) const;status_t getInputBuffers(Vector *buffers) const;status_t getOutputBuffers(Vector
11、*buffers) const;status_t getOutputBuffer(size_t index, sp *buffer);status_t getOutputFormat(size_t index, sp *format);status_t getInputBuffer(size_t index, sp *buffer);status_t setSurface(const sp status_t requestIDRFrame();/ Notification will be posted once there is something to do, i.e./ an input/
12、output buffer has become available, a format change is / pending, an error is pending.void requestActivityNotification(const sp status_t getName(AString *componentName) const;status_t setParameters(const sp / Create a MediaCodec notification message from a list of rendered or dropped render infos/ b
13、y adding rendered frame information to a base notification message. Returns the number/ of frames that were rendered.static size_t CreateFramesRenderedMessage(std:list done, sp protected:virtual MediaCodec();virtual void onMessageReceived(const sp private:/ used by ResourceManagerClientstatus_t recl
14、aim(bool force = false);friend struct ResourceManagerClient;private:enum State UNINITIALIZED,INITIALIZING,INITIALIZED,CONFIGURING,CONFIGURED,STARTING,STARTED,FLUSHING,FLUSHED,STOPPING,RELEASING,;enum kPortIndexInput = 0,kPortIndexOutput = 1,;enum kWhatInit = init,kWhatConfigure = conf,kWhatSetSurfac
15、e = sSur,kWhatCreateInputSurface = cisf,kWhatSetInputSurface = sisf,kWhatStart = strt,kWhatStop = stop,kWhatRelease = rele,kWhatDequeueInputBuffer = deqI, kWhatQueueInputBuffer = queI,kWhatDequeueOutputBuffer = deqO,kWhatReleaseOutputBuffer = relO,kWhatSignalEndOfInputStream = eois,kWhatGetBuffers = getB,kWhatFlush = flu
