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diff --git a/media/libstagefright/httplive/HTTPDownloader.h b/media/libstagefright/httplive/HTTPDownloader.h
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+++ b/media/libstagefright/httplive/HTTPDownloader.h
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+/*
+ * 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 HTTP_DOWNLOADER_H_
+
+#define HTTP_DOWNLOADER_H_
+
+#include <media/stagefright/foundation/ADebug.h>
+#include <utils/KeyedVector.h>
+#include <utils/Mutex.h>
+#include <utils/RefBase.h>
+
+namespace android {
+
+struct ABuffer;
+class DataSource;
+struct HTTPBase;
+struct IMediaHTTPService;
+struct M3UParser;
+
+struct HTTPDownloader : public RefBase {
+    HTTPDownloader(
+            const sp<IMediaHTTPService> &httpService,
+            const KeyedVector<String8, String8> &headers);
+
+    void reconnect();
+    void disconnect();
+    bool isDisconnecting();
+    // If given a non-zero block_size (default 0), it is used to cap the number of
+    // bytes read in from the DataSource. If given a non-NULL buffer, new content
+    // is read into the end.
+    //
+    // The DataSource we read from is responsible for signaling error or EOF to help us
+    // break out of the read loop. The DataSource can be returned to the caller, so
+    // that the caller can reuse it for subsequent fetches (within the initially
+    // requested range).
+    //
+    // For reused HTTP sources, the caller must download a file sequentially without
+    // any overlaps or gaps to prevent reconnection.
+    ssize_t fetchBlock(
+            const char *url,
+            sp<ABuffer> *out,
+            int64_t range_offset, /* open file at range_offset */
+            int64_t range_length, /* open file for range_length (-1: entire file) */
+            uint32_t block_size,  /* download block size (0: entire range) */
+            String8 *actualUrl,   /* returns actual URL */
+            bool reconnect        /* force connect http */
+            );
+
+    // simplified version to fetch a single file
+    ssize_t fetchFile(
+            const char *url,
+            sp<ABuffer> *out,
+            String8 *actualUrl = NULL);
+
+    // fetch a playlist file
+    sp<M3UParser> fetchPlaylist(
+            const char *url, uint8_t *curPlaylistHash, bool *unchanged);
+
+private:
+    sp<HTTPBase> mHTTPDataSource;
+    sp<DataSource> mDataSource;
+    KeyedVector<String8, String8> mExtraHeaders;
+
+    Mutex mLock;
+    bool mDisconnecting;
+
+    DISALLOW_EVIL_CONSTRUCTORS(HTTPDownloader);
+};
+
+}  // namespace android
+
+#endif  // HTTP_DOWNLOADER_H_