blob: 9f413cdfacb897b74fd047b50968272c20ee1102 [file] [log] [blame]
/*
* Copyright 2015 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 ANDROID_CALLBACKDATASOURCE_H
#define ANDROID_CALLBACKDATASOURCE_H
#include <media/DataSource.h>
#include <media/stagefright/foundation/ADebug.h>
namespace android {
class IDataSource;
class IMemory;
// A stagefright DataSource that wraps a binder IDataSource. It's a "Callback"
// DataSource because it calls back to the IDataSource for data.
class CallbackDataSource : public DataSource {
public:
explicit CallbackDataSource(const sp<IDataSource>& iDataSource);
virtual ~CallbackDataSource();
// DataSource implementation.
virtual status_t initCheck() const;
virtual ssize_t readAt(off64_t offset, void *data, size_t size);
virtual status_t getSize(off64_t *size);
virtual uint32_t flags();
virtual void close();
virtual String8 toString() {
return mName;
}
virtual sp<DecryptHandle> DrmInitialization(const char *mime = NULL);
virtual sp<IDataSource> getIDataSource() const;
private:
sp<IDataSource> mIDataSource;
sp<IMemory> mMemory;
bool mIsClosed;
String8 mName;
DISALLOW_EVIL_CONSTRUCTORS(CallbackDataSource);
};
// A caching DataSource that wraps a CallbackDataSource. For reads smaller
// than kCacheSize it will read up to kCacheSize ahead and cache it.
// This reduces the number of binder round trips to the IDataSource and has a significant
// impact on time taken for filetype sniffing and metadata extraction.
class TinyCacheSource : public DataSource {
public:
explicit TinyCacheSource(const sp<DataSource>& source);
virtual status_t initCheck() const;
virtual ssize_t readAt(off64_t offset, void* data, size_t size);
virtual status_t getSize(off64_t* size);
virtual uint32_t flags();
virtual void close() { mSource->close(); }
virtual String8 toString() {
return mName;
}
virtual sp<DecryptHandle> DrmInitialization(const char *mime = NULL);
virtual sp<IDataSource> getIDataSource() const;
private:
// 2kb comes from experimenting with the time-to-first-frame from a MediaPlayer
// with an in-memory MediaDataSource source on a Nexus 5. Beyond 2kb there was
// no improvement.
enum {
kCacheSize = 2048,
};
sp<DataSource> mSource;
uint8_t mCache[kCacheSize];
off64_t mCachedOffset;
size_t mCachedSize;
String8 mName;
DISALLOW_EVIL_CONSTRUCTORS(TinyCacheSource);
};
}; // namespace android
#endif // ANDROID_CALLBACKDATASOURCE_H