1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <media/IStreamSource.h>
18#include <binder/IServiceManager.h>
19#include "android/android_GenericMediaPlayer.h"
20
21// number of SLuint32 fields to store a buffer event message in an item, by mapping each
22//   to the item key (SLuint32), the item size (SLuint32), and the item data (mask on SLuint32)
23#define NB_BUFFEREVENT_ITEM_FIELDS 3
24
25//--------------------------------------------------------------------------------------------------
26namespace android {
27
28//--------------------------------------------------------------------------------------------------
29class StreamPlayer;
30
31class StreamSourceAppProxy : public BnStreamSource {
32public:
33    StreamSourceAppProxy(
34            IAndroidBufferQueue *androidBufferQueue,
35            const sp<CallbackProtector> &callbackProtector,
36            StreamPlayer *player);
37    virtual ~StreamSourceAppProxy();
38
39    // store an item structure to indicate a processed buffer
40    static const SLuint32 kItemProcessed[NB_BUFFEREVENT_ITEM_FIELDS];
41
42    // IStreamSource implementation
43    virtual void setListener(const sp<IStreamListener> &listener); // mediaserver calls exactly once
44    virtual void setBuffers(const Vector<sp<IMemory> > &buffers);  // mediaserver calls exactly once
45    virtual void onBufferAvailable(size_t index);
46
47    // Consumption from ABQ
48    void pullFromBuffQueue();
49
50private:
51    void receivedCmd_l(IStreamListener::Command cmd, const sp<AMessage> &msg = NULL);
52    void receivedBuffer_l(size_t buffIndex, size_t buffLength);
53
54public:
55    // Call at least once prior to releasing the last strong reference to this object. It causes
56    // the player to release all of its resources, similar to android.media.MediaPlayer disconnect.
57    void disconnect();
58
59private:
60    // protects mListener, mBuffers, mBuffersHasBeenSet, and mAvailableBuffers
61    Mutex mLock;
62
63    sp<IStreamListener> mListener;
64    // array of shared memory buffers
65    Vector<sp<IMemory> > mBuffers;
66    bool mBuffersHasBeenSet;
67    // list of available buffers in shared memory, identified by their index
68    List<size_t> mAvailableBuffers;
69
70    // the Android Buffer Queue from which data is consumed and written to shared memory
71    IAndroidBufferQueue* const mAndroidBufferQueue;
72
73    const sp<CallbackProtector> mCallbackProtector;
74    const wp<StreamPlayer> mPlayer;
75
76    DISALLOW_EVIL_CONSTRUCTORS(StreamSourceAppProxy);
77};
78
79
80//--------------------------------------------------------------------------------------------------
81class StreamPlayer : public GenericMediaPlayer
82{
83public:
84    StreamPlayer(const AudioPlayback_Parameters* params, bool hasVideo,
85           IAndroidBufferQueue *androidBufferQueue, const sp<CallbackProtector> &callbackProtector);
86    virtual ~StreamPlayer();
87
88    // overridden from GenericPlayer
89    virtual void onMessageReceived(const sp<AMessage> &msg);
90    virtual void preDestroy();
91
92    void queueRefilled();
93    // Called after AndroidBufferQueue::Clear.
94    // The "_l" indicates the caller still has it's (now empty) AndroidBufferQueue locked.
95    void appClear_l();
96
97protected:
98
99    enum {
100        // message to asynchronously notify mAppProxy it should try to pull from the Android
101        //    Buffer Queue and push to shared memory (media server), either because the buffer queue
102        //    was refilled, or because during playback, the shared memory buffers should remain
103        //    filled to prevent it from draining (this can happen if the ABQ is not ready
104        //    whenever a shared memory buffer becomes available)
105        kWhatPullFromAbq    = 'plfq',
106        kWhatStopForDestroy = 's4ds'
107    };
108
109    const sp<StreamSourceAppProxy> mAppProxy; // application proxy for the shared memory source
110
111    // overridden from GenericMediaPlayer
112    virtual void onPrepare();
113    virtual void onPlay();
114
115    void onPullFromAndroidBufferQueue();
116
117private:
118    void onStopForDestroy();
119
120    Mutex mStopForDestroyLock;
121    Condition mStopForDestroyCondition;
122    bool mStopForDestroyCompleted;
123
124    DISALLOW_EVIL_CONSTRUCTORS(StreamPlayer);
125};
126
127} // namespace android
128