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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.
*/
#ifndef THROTTLED_SOURCE_H_
#define THROTTLED_SOURCE_H_
#include <media/stagefright/DataSource.h>
#include <utils/threads.h>
namespace android {
struct ThrottledSource : public DataSource {
ThrottledSource(
const sp<DataSource> &source,
int32_t bandwidthLimitBytesPerSecond);
// implementation of readAt() that sleeps to achieve the desired max throughput
virtual ssize_t readAt(off64_t offset, void *data, size_t size);
// returns an empty string to prevent callers from using the Uri to construct a new datasource
virtual String8 getUri() {
return String8();
}
// following methods all call through to the wrapped DataSource's methods
status_t initCheck() const {
return mSource->initCheck();
}
virtual status_t getSize(off64_t *size) {
return mSource->getSize(size);
}
virtual uint32_t flags() {
return mSource->flags();
}
virtual status_t reconnectAtOffset(off64_t offset) {
return mSource->reconnectAtOffset(offset);
}
virtual sp<DecryptHandle> DrmInitialization(const char *mime = NULL) {
return mSource->DrmInitialization(mime);
}
virtual void getDrmInfo(sp<DecryptHandle> &handle, DrmManagerClient **client) {
mSource->getDrmInfo(handle, client);
};
virtual String8 getMIMEType() const {
return mSource->getMIMEType();
}
private:
Mutex mLock;
sp<DataSource> mSource;
int32_t mBandwidthLimitBytesPerSecond;
int64_t mStartTimeUs;
size_t mTotalTransferred;
ThrottledSource(const ThrottledSource &);
ThrottledSource &operator=(const ThrottledSource &);
};
} // namespace android
#endif // THROTTLED_SOURCE_H_
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