include/media/MediaPlayerInterface.h

/*
 * Copyright (C) 2007 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_MEDIAPLAYERINTERFACE_H
#define ANDROID_MEDIAPLAYERINTERFACE_H

#ifdef __cplusplus

#include <sys/types.h>
#include <ui/ISurface.h>
#include <utils/RefBase.h>
#include <utils/Errors.h>

#include <media/mediaplayer.h>
#include <media/AudioSystem.h>

namespace android {

class Parcel;

enum player_type {
    PV_PLAYER = 1,
    SONIVOX_PLAYER = 2,
    VORBIS_PLAYER = 3,
    STAGEFRIGHT_PLAYER = 4,
    // Test players are available only in the 'test' and 'eng' builds.
    // The shared library with the test player is passed passed as an
    // argument to the 'test:' url in the setDataSource call.
    TEST_PLAYER = 5,
};


#define DEFAULT_AUDIOSINK_BUFFERCOUNT 4
#define DEFAULT_AUDIOSINK_BUFFERSIZE 1200
#define DEFAULT_AUDIOSINK_SAMPLERATE 44100


// callback mechanism for passing messages to MediaPlayer object
typedef void (*notify_callback_f)(void* cookie, int msg, int ext1, int ext2);

// abstract base class - use MediaPlayerInterface
class MediaPlayerBase : public RefBase
{
public:
    // AudioSink: abstraction layer for audio output
    class AudioSink : public RefBase {
    public:
        typedef void (*AudioCallback)(
                AudioSink *audioSink, void *buffer, size_t size, void *cookie);

        virtual             ~AudioSink() {}
        virtual bool        ready() const = 0; // audio output is open and ready
        virtual bool        realtime() const = 0; // audio output is real-time output
        virtual ssize_t     bufferSize() const = 0;
        virtual ssize_t     frameCount() const = 0;
        virtual ssize_t     channelCount() const = 0;
        virtual ssize_t     frameSize() const = 0;
        virtual uint32_t    latency() const = 0;
        virtual float       msecsPerFrame() const = 0;

        // If no callback is specified, use the "write" API below to submit
        // audio data. Otherwise return a full buffer of audio data on each
        // callback.
        virtual status_t    open(
                uint32_t sampleRate, int channelCount,
                int format=AudioSystem::PCM_16_BIT,
                int bufferCount=DEFAULT_AUDIOSINK_BUFFERCOUNT,
                AudioCallback cb = NULL,
                void *cookie = NULL) = 0;

        virtual void        start() = 0;
        virtual ssize_t     write(const void* buffer, size_t size) = 0;
        virtual void        stop() = 0;
        virtual void        flush() = 0;
        virtual void        pause() = 0;
        virtual void        close() = 0;
    };

                        MediaPlayerBase() : mCookie(0), mNotify(0) {}
    virtual             ~MediaPlayerBase() {}
    virtual status_t    initCheck() = 0;
    virtual bool        hardwareOutput() = 0;
    virtual status_t    setDataSource(const char *url) = 0;
    virtual status_t    setDataSource(int fd, int64_t offset, int64_t length) = 0;
    virtual status_t    setVideoSurface(const sp<ISurface>& surface) = 0;
    virtual status_t    prepare() = 0;
    virtual status_t    prepareAsync() = 0;
    virtual status_t    start() = 0;
    virtual status_t    stop() = 0;
    virtual status_t    pause() = 0;
    virtual bool        isPlaying() = 0;
    virtual status_t    seekTo(int msec) = 0;
    virtual status_t    getCurrentPosition(int *msec) = 0;
    virtual status_t    getDuration(int *msec) = 0;
    virtual status_t    reset() = 0;
    virtual status_t    setLooping(int loop) = 0;
    virtual player_type playerType() = 0;
    virtual void        setNotifyCallback(void* cookie, notify_callback_f notifyFunc) {
                            mCookie = cookie; mNotify = notifyFunc; }
    // Invoke a generic method on the player by using opaque parcels
    // for the request and reply.
    // @param request Parcel that is positioned at the start of the
    //                data sent by the java layer.
    // @param[out] reply Parcel to hold the reply data. Cannot be null.
    // @return OK if the invocation was made successfully. A player
    // not supporting the direct API should return INVALID_OPERATION.
    virtual status_t    invoke(const Parcel& request, Parcel *reply) = 0;
protected:
    virtual void        sendEvent(int msg, int ext1=0, int ext2=0) { if (mNotify) mNotify(mCookie, msg, ext1, ext2); }

    void*               mCookie;
    notify_callback_f   mNotify;
};

// Implement this class for media players that use the AudioFlinger software mixer
class MediaPlayerInterface : public MediaPlayerBase
{
public:
    virtual             ~MediaPlayerInterface() { }
    virtual bool        hardwareOutput() { return false; }
    virtual void        setAudioSink(const sp<AudioSink>& audioSink) { mAudioSink = audioSink; }
protected:
    sp<AudioSink>       mAudioSink;
};

// Implement this class for media players that output directo to hardware
class MediaPlayerHWInterface : public MediaPlayerBase
{
public:
    virtual             ~MediaPlayerHWInterface() {}
    virtual bool        hardwareOutput() { return true; }
    virtual status_t    setVolume(float leftVolume, float rightVolume) = 0;
    virtual status_t    setAudioStreamType(int streamType) = 0;
};

}; // namespace android

#endif // __cplusplus


#endif // ANDROID_MEDIAPLAYERINTERFACE_H