1 /*
2  * Copyright 2016, 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 #ifndef A_BUFFER_CHANNEL_H_
18 
19 #define A_BUFFER_CHANNEL_H_
20 
21 #include <map>
22 #include <memory>
23 #include <mutex>
24 #include <vector>
25 
26 #include <media/openmax/OMX_Types.h>
27 #include <media/stagefright/CodecBase.h>
28 #include <mediadrm/ICrypto.h>
29 #include <media/IOMX.h>
30 
31 namespace android {
32 namespace hardware {
33 class HidlMemory;
34 };
35 using hardware::HidlMemory;
36 
37 /**
38  * BufferChannelBase implementation for ACodec.
39  */
40 class ACodecBufferChannel : public BufferChannelBase {
41 public:
42     struct BufferAndId {
43         sp<MediaCodecBuffer> mBuffer;
44         IOMX::buffer_id mBufferId;
45     };
46 
47     struct BufferInfo {
48         BufferInfo(
49                 const sp<MediaCodecBuffer> &buffer,
50                 IOMX::buffer_id bufferId,
51                 const sp<IMemory> &sharedEncryptedBuffer);
52 
53         BufferInfo() = delete;
54 
55         // Buffer facing MediaCodec and its clients.
56         const sp<MediaCodecBuffer> mClientBuffer;
57         // Buffer facing CodecBase.
58         const sp<MediaCodecBuffer> mCodecBuffer;
59         // OMX buffer ID.
60         const IOMX::buffer_id mBufferId;
61         // Encrypted buffer in case of secure input.
62         const sp<IMemory> mSharedEncryptedBuffer;
63     };
64 
65     ACodecBufferChannel(
66             const sp<AMessage> &inputBufferFilled, const sp<AMessage> &outputBufferDrained);
67     virtual ~ACodecBufferChannel();
68 
69     // BufferChannelBase interface
70     virtual status_t queueInputBuffer(const sp<MediaCodecBuffer> &buffer) override;
71     virtual status_t queueSecureInputBuffer(
72             const sp<MediaCodecBuffer> &buffer,
73             bool secure,
74             const uint8_t *key,
75             const uint8_t *iv,
76             CryptoPlugin::Mode mode,
77             CryptoPlugin::Pattern pattern,
78             const CryptoPlugin::SubSample *subSamples,
79             size_t numSubSamples,
80             AString *errorDetailMsg) override;
81     virtual status_t renderOutputBuffer(
82             const sp<MediaCodecBuffer> &buffer, int64_t timestampNs) override;
83     virtual status_t discardBuffer(const sp<MediaCodecBuffer> &buffer) override;
84     virtual void getInputBufferArray(Vector<sp<MediaCodecBuffer>> *array) override;
85     virtual void getOutputBufferArray(Vector<sp<MediaCodecBuffer>> *array) override;
86 
87     // Methods below are interface for ACodec to use.
88 
89     /**
90      * Set input buffer array.
91      *
92      * @param array     Newly allocated buffers. Empty if buffers are
93      *                  deallocated.
94      */
95     void setInputBufferArray(const std::vector<BufferAndId> &array);
96     /**
97      * Set output buffer array.
98      *
99      * @param array     Newly allocated buffers. Empty if buffers are
100      *                  deallocated.
101      */
102     void setOutputBufferArray(const std::vector<BufferAndId> &array);
103     /**
104      * Request MediaCodec to fill the specified input buffer.
105      *
106      * @param bufferId  ID of the buffer, assigned by underlying component.
107      */
108     void fillThisBuffer(IOMX::buffer_id bufferID);
109     /**
110      * Request MediaCodec to drain the specified output buffer.
111      *
112      * @param bufferId  ID of the buffer, assigned by underlying component.
113      * @param omxFlags  flags associated with this buffer (e.g. EOS).
114      */
115     void drainThisBuffer(IOMX::buffer_id bufferID, OMX_U32 omxFlags);
116 
117 private:
118     const sp<AMessage> mInputBufferFilled;
119     const sp<AMessage> mOutputBufferDrained;
120 
121     sp<MemoryDealer> mDealer;
122     sp<IMemory> mDecryptDestination;
123     int32_t mHeapSeqNum;
124     sp<HidlMemory> mHidlMemory;
125 
126     // These should only be accessed via std::atomic_* functions.
127     //
128     // Note on thread safety: since the vector and BufferInfo are const, it's
129     // safe to read them at any thread once the shared_ptr object is atomically
130     // obtained. Inside BufferInfo, mBufferId and mSharedEncryptedBuffer are
131     // immutable objects. We write internal states of mClient/CodecBuffer when
132     // the caller has given up the reference, so that access is also safe.
133     std::shared_ptr<const std::vector<const BufferInfo>> mInputBuffers;
134     std::shared_ptr<const std::vector<const BufferInfo>> mOutputBuffers;
135 
136     sp<MemoryDealer> makeMemoryDealer(size_t heapSize);
137 
hasCryptoOrDescrambler()138     bool hasCryptoOrDescrambler() {
139         return mCrypto != NULL || mDescrambler != NULL;
140     }
141 };
142 
143 }  // namespace android
144 
145 #endif  // A_BUFFER_CHANNEL_H_
146