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      1 /*
      2  * Copyright (C) 2012 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 ANDROID_AUDIO_STREAM_OUT_SINK_H
     18 #define ANDROID_AUDIO_STREAM_OUT_SINK_H
     19 
     20 #include <media/nbaio/NBAIO.h>
     21 
     22 namespace android {
     23 
     24 class StreamOutHalInterface;
     25 
     26 // not multi-thread safe
     27 class AudioStreamOutSink : public NBAIO_Sink {
     28 
     29 public:
     30     AudioStreamOutSink(sp<StreamOutHalInterface> stream);
     31     virtual ~AudioStreamOutSink();
     32 
     33     // NBAIO_Port interface
     34 
     35     virtual ssize_t negotiate(const NBAIO_Format offers[], size_t numOffers,
     36                               NBAIO_Format counterOffers[], size_t& numCounterOffers);
     37     //virtual NBAIO_Format format();
     38 
     39     // NBAIO_Sink interface
     40 
     41     //virtual size_t framesWritten() const;
     42     //virtual size_t framesUnderrun() const;
     43     //virtual size_t underruns() const;
     44 
     45     // This is an over-estimate, and could dupe the caller into making a blocking write()
     46     // FIXME Use an audio HAL API to query the buffer emptying status when it's available.
     47     virtual ssize_t availableToWrite() { return mStreamBufferSizeBytes / mFrameSize; }
     48 
     49     virtual ssize_t write(const void *buffer, size_t count);
     50 
     51     virtual status_t getTimestamp(ExtendedTimestamp &timestamp);
     52 
     53     // NBAIO_Sink end
     54 
     55 #if 0   // until necessary
     56     sp<StreamOutHalInterface> stream() const { return mStream; }
     57 #endif
     58 
     59 private:
     60     sp<StreamOutHalInterface> mStream;
     61     size_t              mStreamBufferSizeBytes; // as reported by get_buffer_size()
     62 };
     63 
     64 }   // namespace android
     65 
     66 #endif  // ANDROID_AUDIO_STREAM_OUT_SINK_H
     67