include/media/stagefright/HTTPDataSource.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 HTTP_DATASOURCE_H_

#define HTTP_DATASOURCE_H_

#include <media/stagefright/DataSource.h>
#include <utils/String8.h>
#include <utils/threads.h>

namespace android {

class HTTPStream;

class HTTPDataSource : public DataSource {
public:
    HTTPDataSource(
            const char *host, int port, const char *path,
            const KeyedVector<String8, String8> *headers = NULL);

    HTTPDataSource(
            const char *uri,
            const KeyedVector<String8, String8> *headers = NULL);

    status_t connect();
    void disconnect();

    virtual status_t initCheck() const;

    virtual ssize_t readAt(off_t offset, void *data, size_t size);

    virtual status_t getSize(off_t *size);

    virtual uint32_t flags();

protected:
    virtual ~HTTPDataSource();

private:
    enum {
        kBufferSize = 64 * 1024,

        // If we encounter a socket-read error we'll try reconnecting
        // and restarting the read for at most this many times.
        kMaxNumRetries = 3,
    };

    enum State {
        DISCONNECTED,
        CONNECTING,
        CONNECTED
    };

    State mState;
    mutable Mutex mStateLock;

    String8 mHeaders;

    String8 mStartingHost;
    String8 mStartingPath;
    int mStartingPort;

    HTTPStream *mHttp;

    void *mBuffer;
    size_t mBufferLength;
    off_t mBufferOffset;

    bool mContentLengthValid;
    unsigned long long mContentLength;

    int32_t mNumRetriesLeft;

    void init(const KeyedVector<String8, String8> *headers);

    ssize_t sendRangeRequest(size_t offset);
    void initHeaders(const KeyedVector<String8, String8> *overrides);

    status_t connectWithRedirectsAndRange(off_t rangeStart);
    void applyTimeoutResponse();

    HTTPDataSource(const HTTPDataSource &);
    HTTPDataSource &operator=(const HTTPDataSource &);
};

}  // namespace android

#endif  // HTTP_DATASOURCE_H_