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 <hardware/audio.h> 21 #include "NBAIO.h" 22 23 namespace android { 24 25 // not multi-thread safe 26 class AudioStreamOutSink : public NBAIO_Sink { 27 28 public: 29 AudioStreamOutSink(audio_stream_out *stream); 30 virtual ~AudioStreamOutSink(); 31 32 // NBAIO_Port interface 33 34 virtual ssize_t negotiate(const NBAIO_Format offers[], size_t numOffers, 35 NBAIO_Format counterOffers[], size_t& numCounterOffers); 36 //virtual NBAIO_Format format(); 37 38 // NBAIO_Sink interface 39 40 //virtual size_t framesWritten() const; 41 //virtual size_t framesUnderrun() const; 42 //virtual size_t underruns() const; 43 44 // This is an over-estimate, and could dupe the caller into making a blocking write() 45 // FIXME Use an audio HAL API to query the buffer emptying status when it's available. 46 virtual ssize_t availableToWrite() const { return mStreamBufferSizeBytes >> mBitShift; } 47 48 virtual ssize_t write(const void *buffer, size_t count); 49 50 // AudioStreamOutSink wraps a HAL's output stream. Its 51 // getNextWriteTimestamp method is simply a passthru to the HAL's underlying 52 // implementation of GNWT (if any) 53 virtual status_t getNextWriteTimestamp(int64_t *timestamp); 54 55 // NBAIO_Sink end 56 57 #if 0 // until necessary 58 audio_stream_out *stream() const { return mStream; } 59 #endif 60 61 private: 62 audio_stream_out * const mStream; 63 size_t mStreamBufferSizeBytes; // as reported by get_buffer_size() 64 }; 65 66 } // namespace android 67 68 #endif // ANDROID_AUDIO_STREAM_OUT_SINK_H 69
