include/media/DataSource.h

/*
 * Copyright (C) 2009 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 DATA_SOURCE_H_

#define DATA_SOURCE_H_

#include <sys/types.h>

#include <android/IDataSource.h>
#include <media/stagefright/MediaErrors.h>
#include <media/stagefright/DataSourceBase.h>
#include <media/MediaExtractorPluginApi.h>
#include <utils/Errors.h>
#include <utils/RefBase.h>
#include <utils/threads.h>


namespace android {

class String8;

class DataSource : public DataSourceBase, public virtual RefBase {
public:
    DataSource() : mWrapper(NULL) {}

    // returns a pointer to IDataSource if it is wrapped.
    virtual sp<IDataSource> getIDataSource() const {
        return nullptr;
    }

    virtual String8 toString() {
        return String8("<unspecified>");
    }

    virtual status_t reconnectAtOffset(off64_t /*offset*/) {
        return ERROR_UNSUPPORTED;
    }

    ////////////////////////////////////////////////////////////////////////////

    virtual String8 getUri() {
        return String8();
    }

    virtual bool getUri(char *uriString, size_t bufferSize) final {
        int ret = snprintf(uriString, bufferSize, "%s", getUri().c_str());
        return ret >= 0 && static_cast<size_t>(ret) < bufferSize;
    }

    virtual String8 getMIMEType() const {
        return String8("application/octet-stream");
    }

    CDataSource *wrap() {
        if (mWrapper) {
            return mWrapper;
        }
        mWrapper = new CDataSource();
        mWrapper->handle = this;

        mWrapper->readAt = [](void *handle, off64_t offset, void *data, size_t size) -> ssize_t {
            return ((DataSource*)handle)->readAt(offset, data, size);
        };
        mWrapper->getSize = [](void *handle, off64_t *size) -> status_t {
            return ((DataSource*)handle)->getSize(size);
        };
        mWrapper->flags = [](void *handle) -> uint32_t {
            return ((DataSource*)handle)->flags();
        };
        mWrapper->getUri = [](void *handle, char *uriString, size_t bufferSize) -> bool {
            return ((DataSource*)handle)->getUri(uriString, bufferSize);
        };
        return mWrapper;
    }

protected:
    virtual ~DataSource() {
        delete mWrapper;
    }

private:
    CDataSource *mWrapper;
    DataSource(const DataSource &);
    DataSource &operator=(const DataSource &);
};

}  // namespace android

#endif  // DATA_SOURCE_H_