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 "NBAIO.h" 21 22namespace android { 23 24class StreamOutHalInterface; 25 26// not multi-thread safe 27class AudioStreamOutSink : public NBAIO_Sink { 28 29public: 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 ×tamp); 52 53 // NBAIO_Sink end 54 55#if 0 // until necessary 56 sp<StreamOutHalInterface> stream() const { return mStream; } 57#endif 58 59private: 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