blob: 6d826e9e0024e33af4364086d73bc1d8f4a04ec9 [file] [log] [blame]
/*
* Copyright (C) 2012 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 "MediaBufferPuller"
#include <utils/Log.h>
#include <media/stagefright/MediaSource.h>
#include <media/stagefright/MediaBuffer.h>
#include <media/stagefright/MediaDefs.h>
#include "MediaBufferPuller.h"
namespace android {
MediaBufferPuller::MediaBufferPuller(const sp<MediaSource>& source)
: mSource(source),
mAskToStart(false),
mAskToStop(false),
mAcquireStopped(false),
mReleaseStopped(false),
mSourceError(OK) {
androidCreateThread(acquireThreadStart, this);
androidCreateThread(releaseThreadStart, this);
}
MediaBufferPuller::~MediaBufferPuller() {
stop();
}
bool MediaBufferPuller::hasMediaSourceReturnedError() const {
Mutex::Autolock autolock(mLock);
return ((mSourceError != OK) ? true : false);
}
void MediaBufferPuller::start() {
Mutex::Autolock autolock(mLock);
mAskToStart = true;
mAcquireCond.signal();
mReleaseCond.signal();
}
void MediaBufferPuller::stop() {
Mutex::Autolock autolock(mLock);
mAskToStop = true;
mAcquireCond.signal();
mReleaseCond.signal();
while (!mAcquireStopped || !mReleaseStopped) {
mUserCond.wait(mLock);
}
// Release remaining buffers
for (size_t i = 0; i < mBuffers.size(); i++) {
mBuffers.itemAt(i)->release();
}
for (size_t i = 0; i < mReleaseBuffers.size(); i++) {
mReleaseBuffers.itemAt(i)->release();
}
mBuffers.clear();
mReleaseBuffers.clear();
}
MediaBuffer* MediaBufferPuller::getBufferNonBlocking() {
Mutex::Autolock autolock(mLock);
if (mBuffers.empty()) {
return NULL;
} else {
MediaBuffer* b = mBuffers.itemAt(0);
mBuffers.removeAt(0);
return b;
}
}
MediaBuffer* MediaBufferPuller::getBufferBlocking() {
Mutex::Autolock autolock(mLock);
while (mBuffers.empty() && !mAcquireStopped) {
mUserCond.wait(mLock);
}
if (mBuffers.empty()) {
return NULL;
} else {
MediaBuffer* b = mBuffers.itemAt(0);
mBuffers.removeAt(0);
return b;
}
}
void MediaBufferPuller::putBuffer(MediaBuffer* buffer) {
Mutex::Autolock autolock(mLock);
mReleaseBuffers.push(buffer);
mReleaseCond.signal();
}
int MediaBufferPuller::acquireThreadStart(void* arg) {
MediaBufferPuller* self = (MediaBufferPuller*)arg;
self->acquireThreadFunc();
return 0;
}
int MediaBufferPuller::releaseThreadStart(void* arg) {
MediaBufferPuller* self = (MediaBufferPuller*)arg;
self->releaseThreadFunc();
return 0;
}
void MediaBufferPuller::acquireThreadFunc() {
mLock.lock();
// Wait for the start signal
while (!mAskToStart && !mAskToStop) {
mAcquireCond.wait(mLock);
}
// Loop until we are asked to stop, or there is nothing more to read
while (!mAskToStop) {
MediaBuffer* pBuffer;
mLock.unlock();
status_t result = mSource->read(&pBuffer, NULL);
mLock.lock();
mSourceError = result;
if (result == ERROR_END_OF_STREAM && pBuffer != NULL) {
mAskToStop = true;
} else if (result != OK) {
break;
}
mBuffers.push(pBuffer);
mUserCond.signal();
}
mAcquireStopped = true;
mUserCond.signal();
mLock.unlock();
}
void MediaBufferPuller::releaseThreadFunc() {
mLock.lock();
// Wait for the start signal
while (!mAskToStart && !mAskToStop) {
mReleaseCond.wait(mLock);
}
// Loop until we are asked to stop
while (1) {
if (mReleaseBuffers.empty()) {
if (mAskToStop) {
break;
} else {
mReleaseCond.wait(mLock);
continue;
}
}
MediaBuffer* pBuffer = mReleaseBuffers.itemAt(0);
mReleaseBuffers.removeAt(0);
mLock.unlock();
pBuffer->release();
mLock.lock();
}
mReleaseStopped = true;
mUserCond.signal();
mLock.unlock();
}
}; // namespace android