media/libmediaplayerservice/MediaPlayerService.h

/*
**
** Copyright 2008, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
**     http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/

#ifndef ANDROID_MEDIAPLAYERSERVICE_H
#define ANDROID_MEDIAPLAYERSERVICE_H

#include <utils/Log.h>
#include <utils/threads.h>
#include <utils/List.h>
#include <utils/Errors.h>
#include <utils/KeyedVector.h>
#include <utils/String8.h>
#include <utils/Vector.h>

#include <media/IMediaPlayerService.h>
#include <media/MediaPlayerInterface.h>
#include <media/Metadata.h>

namespace android {

class IMediaRecorder;
class IMediaMetadataRetriever;
class IOMX;
class MediaRecorderClient;

#define CALLBACK_ANTAGONIZER 0
#if CALLBACK_ANTAGONIZER
class Antagonizer {
public:
    Antagonizer(notify_callback_f cb, void* client);
    void start() { mActive = true; }
    void stop() { mActive = false; }
    void kill();
private:
    static const int interval;
    Antagonizer();
    static int callbackThread(void* cookie);
    Mutex               mLock;
    Condition           mCondition;
    bool                mExit;
    bool                mActive;
    void*               mClient;
    notify_callback_f   mCb;
};
#endif

class MediaPlayerService : public BnMediaPlayerService
{
    class Client;

    class AudioOutput : public MediaPlayerBase::AudioSink
    {
    public:
                                AudioOutput(int sessionId);
        virtual                 ~AudioOutput();

        virtual bool            ready() const { return mTrack != NULL; }
        virtual bool            realtime() const { return true; }
        virtual ssize_t         bufferSize() const;
        virtual ssize_t         frameCount() const;
        virtual ssize_t         channelCount() const;
        virtual ssize_t         frameSize() const;
        virtual uint32_t        latency() const;
        virtual float           msecsPerFrame() const;
        virtual status_t        getPosition(uint32_t *position);

        virtual status_t        open(
                uint32_t sampleRate, int channelCount,
                int format, int bufferCount,
                AudioCallback cb, void *cookie);

        virtual void            start();
        virtual ssize_t         write(const void* buffer, size_t size);
        virtual void            stop();
        virtual void            flush();
        virtual void            pause();
        virtual void            close();
                void            setAudioStreamType(int streamType) { mStreamType = streamType; }
                void            setVolume(float left, float right);
        virtual status_t        dump(int fd, const Vector<String16>& args) const;

        static bool             isOnEmulator();
        static int              getMinBufferCount();
    private:
        static void             setMinBufferCount();
        static void             CallbackWrapper(
                int event, void *me, void *info);

        AudioTrack*             mTrack;
        AudioCallback           mCallback;
        void *                  mCallbackCookie;
        int                     mStreamType;
        float                   mLeftVolume;
        float                   mRightVolume;
        float                   mMsecsPerFrame;
        uint32_t                mLatency;
        int                     mSessionId;

        static bool             mIsOnEmulator;
        static int              mMinBufferCount;  // 12 for emulator; otherwise 4

        public: // visualization hack support
        uint32_t                mNumFramesWritten;
        void                    snoopWrite(const void*, size_t);
    };

    class AudioCache : public MediaPlayerBase::AudioSink
    {
    public:
                                AudioCache(const char* name);
        virtual                 ~AudioCache() {}

        virtual bool            ready() const { return (mChannelCount > 0) && (mHeap->getHeapID() > 0); }
        virtual bool            realtime() const { return false; }
        virtual ssize_t         bufferSize() const { return frameSize() * mFrameCount; }
        virtual ssize_t         frameCount() const { return mFrameCount; }
        virtual ssize_t         channelCount() const { return (ssize_t)mChannelCount; }
        virtual ssize_t         frameSize() const { return ssize_t(mChannelCount * ((mFormat == AudioSystem::PCM_16_BIT)?sizeof(int16_t):sizeof(u_int8_t))); }
        virtual uint32_t        latency() const;
        virtual float           msecsPerFrame() const;
        virtual status_t        getPosition(uint32_t *position);

        virtual status_t        open(
                uint32_t sampleRate, int channelCount, int format,
                int bufferCount = 1,
                AudioCallback cb = NULL, void *cookie = NULL);

        virtual void            start();
        virtual ssize_t         write(const void* buffer, size_t size);
        virtual void            stop();
        virtual void            flush() {}
        virtual void            pause() {}
        virtual void            close() {}
                void            setAudioStreamType(int streamType) {}
                void            setVolume(float left, float right) {}
                uint32_t        sampleRate() const { return mSampleRate; }
                uint32_t        format() const { return (uint32_t)mFormat; }
                size_t          size() const { return mSize; }
                status_t        wait();

                sp<IMemoryHeap> getHeap() const { return mHeap; }

        static  void            notify(void* cookie, int msg, int ext1, int ext2);
        virtual status_t        dump(int fd, const Vector<String16>& args) const;

    private:
                                AudioCache();

        Mutex               mLock;
        Condition           mSignal;
        sp<MemoryHeapBase>  mHeap;
        float               mMsecsPerFrame;
        uint16_t            mChannelCount;
        uint16_t            mFormat;
        ssize_t             mFrameCount;
        uint32_t            mSampleRate;
        uint32_t            mSize;
        int                 mError;
        bool                mCommandComplete;

        sp<Thread>          mCallbackThread;
    };

public:
    static  void                instantiate();

    // IMediaPlayerService interface
    virtual sp<IMediaRecorder>  createMediaRecorder(pid_t pid);
    void    removeMediaRecorderClient(wp<MediaRecorderClient> client);
    virtual sp<IMediaMetadataRetriever> createMetadataRetriever(pid_t pid);

    // House keeping for media player clients
    virtual sp<IMediaPlayer>    create(
            pid_t pid, const sp<IMediaPlayerClient>& client, const char* url,
            const KeyedVector<String8, String8> *headers, int audioSessionId);

    virtual sp<IMediaPlayer>    create(pid_t pid, const sp<IMediaPlayerClient>& client, int fd, int64_t offset, int64_t length, int audioSessionId);
    virtual sp<IMemory>         decode(const char* url, uint32_t *pSampleRate, int* pNumChannels, int* pFormat);
    virtual sp<IMemory>         decode(int fd, int64_t offset, int64_t length, uint32_t *pSampleRate, int* pNumChannels, int* pFormat);
    virtual sp<IMemory>         snoop();
    virtual sp<IOMX>            getOMX();

    virtual status_t            dump(int fd, const Vector<String16>& args);

            void                removeClient(wp<Client> client);


private:

    class Client : public BnMediaPlayer {

        // IMediaPlayer interface
        virtual void            disconnect();
        virtual status_t        setVideoSurface(const sp<ISurface>& surface);
        virtual status_t        prepareAsync();
        virtual status_t        start();
        virtual status_t        stop();
        virtual status_t        pause();
        virtual status_t        isPlaying(bool* state);
        virtual status_t        seekTo(int msec);
        virtual status_t        getCurrentPosition(int* msec);
        virtual status_t        getDuration(int* msec);
        virtual status_t        reset();
        virtual status_t        setAudioStreamType(int type);
        virtual status_t        setLooping(int loop);
        virtual status_t        setVolume(float leftVolume, float rightVolume);
        virtual status_t        invoke(const Parcel& request, Parcel *reply);
        virtual status_t        setMetadataFilter(const Parcel& filter);
        virtual status_t        getMetadata(bool update_only,
                                            bool apply_filter,
                                            Parcel *reply);
        virtual status_t        suspend();
        virtual status_t        resume();

        sp<MediaPlayerBase>     createPlayer(player_type playerType);

                status_t        setDataSource(
                        const char *url,
                        const KeyedVector<String8, String8> *headers);

                status_t        setDataSource(int fd, int64_t offset, int64_t length);
        static  void            notify(void* cookie, int msg, int ext1, int ext2);

                pid_t           pid() const { return mPid; }
        virtual status_t        dump(int fd, const Vector<String16>& args) const;

                int             getAudioSessionId() { return mAudioSessionId; }

    private:
        friend class MediaPlayerService;
                                Client( const sp<MediaPlayerService>& service,
                                        pid_t pid,
                                        int32_t connId,
                                        const sp<IMediaPlayerClient>& client,
                                        int audioSessionId);
                                Client();
        virtual                 ~Client();

                void            deletePlayer();

        sp<MediaPlayerBase>     getPlayer() const { Mutex::Autolock lock(mLock); return mPlayer; }



        // @param type Of the metadata to be tested.
        // @return true if the metadata should be dropped according to
        //              the filters.
        bool shouldDropMetadata(media::Metadata::Type type) const;

        // Add a new element to the set of metadata updated. Noop if
        // the element exists already.
        // @param type Of the metadata to be recorded.
        void addNewMetadataUpdate(media::Metadata::Type type);

        mutable     Mutex                       mLock;
                    sp<MediaPlayerBase>         mPlayer;
                    sp<MediaPlayerService>      mService;
                    sp<IMediaPlayerClient>      mClient;
                    sp<AudioOutput>             mAudioOutput;
                    pid_t                       mPid;
                    status_t                    mStatus;
                    bool                        mLoop;
                    int32_t                     mConnId;
                    int                         mAudioSessionId;

        // Metadata filters.
        media::Metadata::Filter mMetadataAllow;  // protected by mLock
        media::Metadata::Filter mMetadataDrop;  // protected by mLock

        // Metadata updated. For each MEDIA_INFO_METADATA_UPDATE
        // notification we try to update mMetadataUpdated which is a
        // set: no duplicate.
        // getMetadata clears this set.
        media::Metadata::Filter mMetadataUpdated;  // protected by mLock

#if CALLBACK_ANTAGONIZER
                    Antagonizer*                mAntagonizer;
#endif
    };

// ----------------------------------------------------------------------------

                            MediaPlayerService();
    virtual                 ~MediaPlayerService();

    mutable     Mutex                       mLock;
                SortedVector< wp<Client> >  mClients;
                SortedVector< wp<MediaRecorderClient> > mMediaRecorderClients;
                int32_t                     mNextConnId;
                sp<IOMX>                    mOMX;
};

// ----------------------------------------------------------------------------

}; // namespace android

#endif // ANDROID_MEDIAPLAYERSERVICE_H