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      1 /*
      2  * Copyright (C) 2011 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 AAC_WRITER_H_
     18 #define AAC_WRITER_H_
     19 
     20 #include "foundation/ABase.h"
     21 #include <media/stagefright/MediaWriter.h>
     22 #include <utils/threads.h>
     23 
     24 namespace android {
     25 
     26 struct MediaSource;
     27 
     28 struct AACWriter : public MediaWriter {
     29     AACWriter(int fd);
     30 
     31     status_t initCheck() const;
     32 
     33     virtual status_t addSource(const sp<MediaSource> &source);
     34     virtual bool reachedEOS();
     35     virtual status_t start(MetaData *params = NULL);
     36     virtual status_t stop() { return reset(); }
     37     virtual status_t pause();
     38 
     39 protected:
     40     virtual ~AACWriter();
     41 
     42 private:
     43     enum {
     44         kAdtsHeaderLength = 7,     // # of bytes for the adts header
     45         kSamplesPerFrame  = 1024,  // # of samples in a frame
     46     };
     47 
     48     int   mFd;
     49     status_t mInitCheck;
     50     sp<MediaSource> mSource;
     51     bool mStarted;
     52     volatile bool mPaused;
     53     volatile bool mResumed;
     54     volatile bool mDone;
     55     volatile bool mReachedEOS;
     56     pthread_t mThread;
     57     int64_t mEstimatedSizeBytes;
     58     int64_t mEstimatedDurationUs;
     59     int32_t mChannelCount;
     60     int32_t mSampleRate;
     61     int32_t mAACProfile;
     62     int32_t mFrameDurationUs;
     63 
     64     static void *ThreadWrapper(void *);
     65     status_t threadFunc();
     66     bool exceedsFileSizeLimit();
     67     bool exceedsFileDurationLimit();
     68     status_t writeAdtsHeader(uint32_t frameLength);
     69     status_t reset();
     70 
     71     DISALLOW_EVIL_CONSTRUCTORS(AACWriter);
     72 };
     73 
     74 }  // namespace android
     75 
     76 #endif  // AAC_WRITER_H_
     77