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
MonoPipeReader(MonoPipe * pipe)26 MonoPipeReader::MonoPipeReader(MonoPipe* pipe) :
27 NBAIO_Source(pipe->mFormat),
28 mPipe(pipe), mFifoReader(mPipe->mFifo, true /*throttlesWriter*/)
29 {
30 }
31
~MonoPipeReader()32 MonoPipeReader::~MonoPipeReader()
33 {
34 }
35
availableToRead()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
read(void * buffer,size_t count)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
onTimestamp(const ExtendedTimestamp & timestamp)58 void MonoPipeReader::onTimestamp(const ExtendedTimestamp ×tamp)
59 {
60 mPipe->mTimestampMutator.push(timestamp);
61 }
62
63 } // namespace android
64