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#define LOG_TAG "Pipe" 18//#define LOG_NDEBUG 0 19 20#include <cutils/atomic.h> 21#include <cutils/compiler.h> 22#include <utils/Log.h> 23#include <media/nbaio/Pipe.h> 24#include <audio_utils/roundup.h> 25 26namespace android { 27 28Pipe::Pipe(size_t maxFrames, const NBAIO_Format& format, void *buffer) : 29 NBAIO_Sink(format), 30 // TODO fifo now supports non-power-of-2 buffer sizes, so could remove the roundup 31 mMaxFrames(roundup(maxFrames)), 32 mBuffer(buffer == NULL ? malloc(mMaxFrames * Format_frameSize(format)) : buffer), 33 mFifo(mMaxFrames, Format_frameSize(format), mBuffer, false /*throttlesWriter*/), 34 mFifoWriter(mFifo), 35 mReaders(0), 36 mFreeBufferInDestructor(buffer == NULL) 37{ 38} 39 40Pipe::~Pipe() 41{ 42 ALOG_ASSERT(android_atomic_acquire_load(&mReaders) == 0); 43 if (mFreeBufferInDestructor) { 44 free(mBuffer); 45 } 46} 47 48ssize_t Pipe::write(const void *buffer, size_t count) 49{ 50 // count == 0 is unlikely and not worth checking for 51 if (CC_UNLIKELY(!mNegotiated)) { 52 return NEGOTIATE; 53 } 54 ssize_t actual = mFifoWriter.write(buffer, count); 55 ALOG_ASSERT(actual <= count); 56 if (actual <= 0) { 57 return actual; 58 } 59 mFramesWritten += (size_t) actual; 60 return actual; 61} 62 63} // namespace android 64