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