1 /*
2 * Copyright (C) 2020 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_NDEBUG 0
18 #define LOG_TAG "MediaTrackTranscoder"
19
20 #include <android-base/logging.h>
21 #include <media/MediaTrackTranscoder.h>
22 #include <media/MediaTrackTranscoderCallback.h>
23 #include <utils/AndroidThreads.h>
24
25 namespace android {
26
configure(const std::shared_ptr<MediaSampleReader> & mediaSampleReader,int trackIndex,const std::shared_ptr<AMediaFormat> & destinationFormat)27 media_status_t MediaTrackTranscoder::configure(
28 const std::shared_ptr<MediaSampleReader>& mediaSampleReader, int trackIndex,
29 const std::shared_ptr<AMediaFormat>& destinationFormat) {
30 std::scoped_lock lock{mStateMutex};
31
32 if (mState != UNINITIALIZED) {
33 LOG(ERROR) << "Configure can only be called once";
34 return AMEDIA_ERROR_UNSUPPORTED;
35 }
36
37 if (mediaSampleReader == nullptr) {
38 LOG(ERROR) << "MediaSampleReader is null";
39 return AMEDIA_ERROR_INVALID_PARAMETER;
40 }
41 if (trackIndex < 0 || trackIndex >= mediaSampleReader->getTrackCount()) {
42 LOG(ERROR) << "TrackIndex is invalid " << trackIndex;
43 return AMEDIA_ERROR_INVALID_PARAMETER;
44 }
45
46 mMediaSampleReader = mediaSampleReader;
47 mTrackIndex = trackIndex;
48
49 mSourceFormat = std::shared_ptr<AMediaFormat>(mMediaSampleReader->getTrackFormat(mTrackIndex),
50 &AMediaFormat_delete);
51 if (mSourceFormat == nullptr) {
52 LOG(ERROR) << "Unable to get format for track #" << mTrackIndex;
53 return AMEDIA_ERROR_MALFORMED;
54 }
55
56 media_status_t status = configureDestinationFormat(destinationFormat);
57 if (status != AMEDIA_OK) {
58 LOG(ERROR) << "configure failed with error " << status;
59 return status;
60 }
61
62 mState = CONFIGURED;
63 return AMEDIA_OK;
64 }
65
start()66 bool MediaTrackTranscoder::start() {
67 std::scoped_lock lock{mStateMutex};
68
69 if (mState != CONFIGURED) {
70 LOG(ERROR) << "TrackTranscoder must be configured before started";
71 return false;
72 }
73 mState = STARTED;
74
75 std::thread([this] {
76 androidSetThreadPriority(0 /* tid (0 = current) */, ANDROID_PRIORITY_BACKGROUND);
77 bool stopped = false;
78 media_status_t status = runTranscodeLoop(&stopped);
79
80 // Output an EOS sample if the transcoder was stopped.
81 if (stopped) {
82 auto sample = std::make_shared<MediaSample>();
83 sample->info.flags = SAMPLE_FLAG_END_OF_STREAM;
84 onOutputSampleAvailable(sample);
85 }
86
87 // Notify the client.
88 if (auto callbacks = mTranscoderCallback.lock()) {
89 if (stopped) {
90 callbacks->onTrackStopped(this);
91 } else if (status == AMEDIA_OK) {
92 callbacks->onTrackFinished(this);
93 } else {
94 callbacks->onTrackError(this, status);
95 }
96 }
97 }).detach();
98
99 return true;
100 }
101
stop(bool stopOnSyncSample)102 void MediaTrackTranscoder::stop(bool stopOnSyncSample) {
103 std::scoped_lock lock{mStateMutex};
104
105 if (mState == STARTED || (mStopRequest == STOP_ON_SYNC && !stopOnSyncSample)) {
106 mStopRequest = stopOnSyncSample ? STOP_ON_SYNC : STOP_NOW;
107 abortTranscodeLoop();
108 mState = STOPPED;
109 } else {
110 LOG(WARNING) << "TrackTranscoder must be started before stopped";
111 }
112 }
113
notifyTrackFormatAvailable()114 void MediaTrackTranscoder::notifyTrackFormatAvailable() {
115 if (auto callbacks = mTranscoderCallback.lock()) {
116 callbacks->onTrackFormatAvailable(this);
117 }
118 }
119
onOutputSampleAvailable(const std::shared_ptr<MediaSample> & sample)120 void MediaTrackTranscoder::onOutputSampleAvailable(const std::shared_ptr<MediaSample>& sample) {
121 std::scoped_lock lock{mSampleMutex};
122 if (mSampleConsumer == nullptr) {
123 mSampleQueue.enqueue(sample);
124 } else {
125 mSampleConsumer(sample);
126 }
127 }
128
setSampleConsumer(const MediaSampleWriter::MediaSampleConsumerFunction & sampleConsumer)129 void MediaTrackTranscoder::setSampleConsumer(
130 const MediaSampleWriter::MediaSampleConsumerFunction& sampleConsumer) {
131 std::scoped_lock lock{mSampleMutex};
132 mSampleConsumer = sampleConsumer;
133
134 std::shared_ptr<MediaSample> sample;
135 while (!mSampleQueue.isEmpty() && !mSampleQueue.dequeue(&sample)) {
136 mSampleConsumer(sample);
137 }
138 }
139
140 } // namespace android
141