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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 SIMPLE_DECODING_SOURCE_H_
     18 #define SIMPLE_DECODING_SOURCE_H_
     19 
     20 #include <system/window.h>
     21 
     22 #include <media/stagefright/MediaSource.h>
     23 #include <media/stagefright/foundation/AString.h>
     24 #include <media/stagefright/foundation/Mutexed.h>
     25 
     26 #include <utils/Condition.h>
     27 #include <utils/StrongPointer.h>
     28 
     29 namespace android {
     30 
     31 struct ALooper;
     32 struct AMessage;
     33 class MediaBuffer;
     34 struct MediaCodec;
     35 class MetaData;
     36 
     37 class SimpleDecodingSource : public MediaSource {
     38 public:
     39     // Creates a MediaSource that uses MediaCodec to decode a compressed input |source|.
     40     // The selected codec can be influenced using |flags|. This source only supports the
     41     // kPreferGoogleCodec and kNonGoogleCodecsOnly |flags| - MediaCodecList.
     42     // You can pass in a target |nativeWindow| to render video directly onto a surface. In this
     43     // case the source will return empty buffers.
     44     // This source cannot be restarted (hence the name "Simple"), all reads are blocking, and
     45     // does not support secure input or pausing.
     46     // if |desiredCodec| is given, use this specific codec.
     47     static sp<SimpleDecodingSource> Create(
     48             const sp<IMediaSource> &source, uint32_t flags = 0,
     49             const sp<ANativeWindow> &nativeWindow = NULL,
     50             const char *desiredCodec = NULL);
     51 
     52     virtual ~SimpleDecodingSource();
     53 
     54     // starts this source (and it's underlying source). |params| is ignored.
     55     virtual status_t start(MetaData *params = NULL);
     56 
     57     // stops this source (and it's underlying source).
     58     virtual status_t stop();
     59 
     60     // returns the output format of this source.
     61     virtual sp<MetaData> getFormat();
     62 
     63     // reads from the source. This call always blocks.
     64     virtual status_t read(MediaBuffer **buffer, const ReadOptions *options);
     65 
     66     // unsupported methods
     67     virtual status_t pause() { return INVALID_OPERATION; }
     68     virtual status_t setBuffers(const Vector<MediaBuffer *> &) { return INVALID_OPERATION; }
     69 
     70 private:
     71     // Construct this using a codec, source and looper.
     72     SimpleDecodingSource(
     73             const sp<MediaCodec> &codec, const sp<IMediaSource> &source, const sp<ALooper> &looper,
     74             bool usingSurface, const sp<AMessage> &format);
     75 
     76     sp<MediaCodec> mCodec;
     77     sp<IMediaSource> mSource;
     78     sp<ALooper> mLooper;
     79     bool mUsingSurface;
     80     enum State {
     81         INIT,
     82         STARTED,
     83         STOPPING,
     84         STOPPED,
     85         ERROR,
     86     };
     87     AString mComponentName;
     88 
     89     struct ProtectedState {
     90         ProtectedState(const sp<AMessage> &format);
     91         bool mReading;
     92         Condition mReadCondition;
     93 
     94         sp<AMessage> mFormat;
     95         State mState;
     96         bool mQueuedInputEOS;
     97         bool mGotOutputEOS;
     98     };
     99     Mutexed<ProtectedState> mProtectedState;
    100 
    101     // do the actual reading
    102     status_t doRead(
    103             Mutexed<ProtectedState>::Locked &me, MediaBuffer **buffer, const ReadOptions *options);
    104 };
    105 
    106 } // namespace android
    107 
    108 #endif
    109