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 "MonoPipeReader" 18 //#define LOG_NDEBUG 0 19 20 #include <cutils/compiler.h> 21 #include <utils/Log.h> 22 #include <media/nbaio/MonoPipeReader.h> 23 24 namespace android { 25 26 MonoPipeReader::MonoPipeReader(MonoPipe* pipe) : 27 NBAIO_Source(pipe->mFormat), 28 mPipe(pipe), mFifoReader(mPipe->mFifo, true /*throttlesWriter*/) 29 { 30 } 31 32 MonoPipeReader::~MonoPipeReader() 33 { 34 } 35 36 ssize_t MonoPipeReader::availableToRead() 37 { 38 if (CC_UNLIKELY(!mNegotiated)) { 39 return NEGOTIATE; 40 } 41 ssize_t ret = mFifoReader.available(); 42 ALOG_ASSERT(ret <= mPipe->mMaxFrames); 43 return ret; 44 } 45 46 ssize_t MonoPipeReader::read(void *buffer, size_t count) 47 { 48 // count == 0 is unlikely and not worth checking for explicitly; will be handled automatically 49 ssize_t actual = mFifoReader.read(buffer, count); 50 ALOG_ASSERT(actual <= count); 51 if (CC_UNLIKELY(actual <= 0)) { 52 return actual; 53 } 54 mFramesRead += (size_t) actual; 55 return actual; 56 } 57 58 void MonoPipeReader::onTimestamp(const ExtendedTimestamp ×tamp) 59 { 60 mPipe->mTimestampMutator.push(timestamp); 61 } 62 63 } // namespace android 64
