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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
//#define LOG_NDEBUG 0
#define LOG_TAG "MediaSourceSplitter"
#include <utils/Log.h>
#include <media/stagefright/MediaSourceSplitter.h>
#include <media/stagefright/MediaDebug.h>
#include <media/stagefright/MediaBuffer.h>
#include <media/stagefright/MetaData.h>
namespace android {
MediaSourceSplitter::MediaSourceSplitter(sp<MediaSource> mediaSource) {
mNumberOfClients = 0;
mSource = mediaSource;
mSourceStarted = false;
mNumberOfClientsStarted = 0;
mNumberOfCurrentReads = 0;
mCurrentReadBit = 0;
mLastReadCompleted = true;
}
MediaSourceSplitter::~MediaSourceSplitter() {
}
sp<MediaSource> MediaSourceSplitter::createClient() {
Mutex::Autolock autoLock(mLock);
sp<MediaSource> client = new Client(this, mNumberOfClients++);
mClientsStarted.push(false);
mClientsDesiredReadBit.push(0);
return client;
}
status_t MediaSourceSplitter::start(int clientId, MetaData *params) {
Mutex::Autolock autoLock(mLock);
LOGV("start client (%d)", clientId);
if (mClientsStarted[clientId]) {
return OK;
}
mNumberOfClientsStarted++;
if (!mSourceStarted) {
LOGV("Starting real source from client (%d)", clientId);
status_t err = mSource->start(params);
if (err == OK) {
mSourceStarted = true;
mClientsStarted.editItemAt(clientId) = true;
mClientsDesiredReadBit.editItemAt(clientId) = !mCurrentReadBit;
}
return err;
} else {
mClientsStarted.editItemAt(clientId) = true;
if (mLastReadCompleted) {
// Last read was completed. So join in the threads for the next read.
mClientsDesiredReadBit.editItemAt(clientId) = !mCurrentReadBit;
} else {
// Last read is ongoing. So join in the threads for the current read.
mClientsDesiredReadBit.editItemAt(clientId) = mCurrentReadBit;
}
return OK;
}
}
status_t MediaSourceSplitter::stop(int clientId) {
Mutex::Autolock autoLock(mLock);
LOGV("stop client (%d)", clientId);
CHECK(clientId >= 0 && clientId < mNumberOfClients);
CHECK(mClientsStarted[clientId]);
if (--mNumberOfClientsStarted == 0) {
LOGV("Stopping real source from client (%d)", clientId);
status_t err = mSource->stop();
mSourceStarted = false;
mClientsStarted.editItemAt(clientId) = false;
return err;
} else {
mClientsStarted.editItemAt(clientId) = false;
if (!mLastReadCompleted && (mClientsDesiredReadBit[clientId] == mCurrentReadBit)) {
// !mLastReadCompleted implies that buffer has been read from source, but all
// clients haven't read it.
// mClientsDesiredReadBit[clientId] == mCurrentReadBit implies that this
// client would have wanted to read from this buffer. (i.e. it has not yet
// called read() for the current read buffer.)
// Since other threads may be waiting for all the clients' reads to complete,
// signal that this read has been aborted.
signalReadComplete_lock(true);
}
return OK;
}
}
sp<MetaData> MediaSourceSplitter::getFormat(int clientId) {
Mutex::Autolock autoLock(mLock);
LOGV("getFormat client (%d)", clientId);
return mSource->getFormat();
}
status_t MediaSourceSplitter::read(int clientId,
MediaBuffer **buffer, const MediaSource::ReadOptions *options) {
Mutex::Autolock autoLock(mLock);
CHECK(clientId >= 0 && clientId < mNumberOfClients);
LOGV("read client (%d)", clientId);
*buffer = NULL;
if (!mClientsStarted[clientId]) {
return OK;
}
if (mCurrentReadBit != mClientsDesiredReadBit[clientId]) {
// Desired buffer has not been read from source yet.
// If the current client is the special client with clientId = 0
// then read from source, else wait until the client 0 has finished
// reading from source.
if (clientId == 0) {
// Wait for all client's last read to complete first so as to not
// corrupt the buffer at mLastReadMediaBuffer.
waitForAllClientsLastRead_lock(clientId);
readFromSource_lock(options);
*buffer = mLastReadMediaBuffer;
} else {
waitForReadFromSource_lock(clientId);
*buffer = mLastReadMediaBuffer;
(*buffer)->add_ref();
}
CHECK(mCurrentReadBit == mClientsDesiredReadBit[clientId]);
} else {
// Desired buffer has already been read from source. Use the cached data.
CHECK(clientId != 0);
*buffer = mLastReadMediaBuffer;
(*buffer)->add_ref();
}
mClientsDesiredReadBit.editItemAt(clientId) = !mClientsDesiredReadBit[clientId];
signalReadComplete_lock(false);
return mLastReadStatus;
}
void MediaSourceSplitter::readFromSource_lock(const MediaSource::ReadOptions *options) {
mLastReadStatus = mSource->read(&mLastReadMediaBuffer , options);
mCurrentReadBit = !mCurrentReadBit;
mLastReadCompleted = false;
mReadFromSourceCondition.broadcast();
}
void MediaSourceSplitter::waitForReadFromSource_lock(int32_t clientId) {
mReadFromSourceCondition.wait(mLock);
}
void MediaSourceSplitter::waitForAllClientsLastRead_lock(int32_t clientId) {
if (mLastReadCompleted) {
return;
}
mAllReadsCompleteCondition.wait(mLock);
CHECK(mLastReadCompleted);
}
void MediaSourceSplitter::signalReadComplete_lock(bool readAborted) {
if (!readAborted) {
mNumberOfCurrentReads++;
}
if (mNumberOfCurrentReads == mNumberOfClientsStarted) {
mLastReadCompleted = true;
mNumberOfCurrentReads = 0;
mAllReadsCompleteCondition.broadcast();
}
}
status_t MediaSourceSplitter::pause(int clientId) {
return ERROR_UNSUPPORTED;
}
// Client
MediaSourceSplitter::Client::Client(
sp<MediaSourceSplitter> splitter,
int32_t clientId) {
mSplitter = splitter;
mClientId = clientId;
}
status_t MediaSourceSplitter::Client::start(MetaData *params) {
return mSplitter->start(mClientId, params);
}
status_t MediaSourceSplitter::Client::stop() {
return mSplitter->stop(mClientId);
}
sp<MetaData> MediaSourceSplitter::Client::getFormat() {
return mSplitter->getFormat(mClientId);
}
status_t MediaSourceSplitter::Client::read(
MediaBuffer **buffer, const ReadOptions *options) {
return mSplitter->read(mClientId, buffer, options);
}
status_t MediaSourceSplitter::Client::pause() {
return mSplitter->pause(mClientId);
}
} // namespace android
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