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