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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 <media/MediaSource.h>
     21 #include <media/stagefright/foundation/AString.h>
     22 #include <media/stagefright/foundation/Mutexed.h>
     23 
     24 #include <utils/Condition.h>
     25 #include <utils/StrongPointer.h>
     26 
     27 struct ANativeWindow;
     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<MediaSource> &source, uint32_t flags,
     49             const sp<ANativeWindow> &nativeWindow,
     50             const char *desiredCodec = NULL,
     51             bool skipMediaCodecList = false);
     52 
     53     static sp<SimpleDecodingSource> Create(
     54             const sp<MediaSource> &source, uint32_t flags = 0);
     55 
     56     virtual ~SimpleDecodingSource();
     57 
     58     // starts this source (and it's underlying source). |params| is ignored.
     59     virtual status_t start(MetaData *params = NULL);
     60 
     61     // stops this source (and it's underlying source).
     62     virtual status_t stop();
     63 
     64     // returns the output format of this source.
     65     virtual sp<MetaData> getFormat();
     66 
     67     // reads from the source. This call always blocks.
     68     virtual status_t read(MediaBufferBase **buffer, const ReadOptions *options);
     69 
     70     // unsupported methods
     71     virtual status_t pause() { return INVALID_OPERATION; }
     72 
     73 private:
     74     // Construct this using a codec, source and looper.
     75     SimpleDecodingSource(
     76             const sp<MediaCodec> &codec, const sp<MediaSource> &source, const sp<ALooper> &looper,
     77             bool usingSurface, bool isVorbis, const sp<AMessage> &format);
     78 
     79     sp<MediaCodec> mCodec;
     80     sp<MediaSource> mSource;
     81     sp<ALooper> mLooper;
     82     bool mUsingSurface;
     83     bool mIsVorbis;
     84     enum State {
     85         INIT,
     86         STARTED,
     87         STOPPING,
     88         STOPPED,
     89         ERROR,
     90     };
     91     AString mComponentName;
     92 
     93     struct ProtectedState {
     94         ProtectedState(const sp<AMessage> &format);
     95         bool mReading;
     96         Condition mReadCondition;
     97 
     98         sp<AMessage> mFormat;
     99         State mState;
    100         bool mQueuedInputEOS;
    101         bool mGotOutputEOS;
    102     };
    103     Mutexed<ProtectedState> mProtectedState;
    104 
    105     // do the actual reading
    106     status_t doRead(
    107             Mutexed<ProtectedState>::Locked &me, MediaBufferBase **buffer,
    108             const ReadOptions *options);
    109 };
    110 
    111 } // namespace android
    112 
    113 #endif
    114