ACodecBufferChannel.h revision de7268d8e20b883ec88a7ff19ad560a665373484 
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
31namespace android {
32
33/**
34 * BufferChannelBase implementation for ACodec.
35 */
36class ACodecBufferChannel : public BufferChannelBase {
37public:
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() = default;
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
113private:
114    const sp<AMessage> mInputBufferFilled;
115    const sp<AMessage> mOutputBufferDrained;
116
117    sp<MemoryDealer> mDealer;
118    sp<IMemory> mDecryptDestination;
119
120    // These should only be accessed via std::atomic_* functions.
121    //
122    // Note on thread safety: since the vector and BufferInfo are const, it's
123    // safe to read them at any thread once the shared_ptr object is atomically
124    // obtained. Inside BufferInfo, mBufferId and mSharedEncryptedBuffer are
125    // immutable objects. We write internal states of mClient/CodecBuffer when
126    // the caller has given up the reference, so that access is also safe.
127    std::shared_ptr<const std::vector<const BufferInfo>> mInputBuffers;
128    std::shared_ptr<const std::vector<const BufferInfo>> mOutputBuffers;
129
130    bool hasCryptoOrDescrambler() {
131        return mCrypto != NULL || mDescrambler != NULL;
132    }
133};
134
135}  // namespace android
136
137#endif  // A_BUFFER_CHANNEL_H_
138