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+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+#ifndef AOM_COMMON_WEBMDEC_H_
+#define AOM_COMMON_WEBMDEC_H_
+
+#include "common/tools_common.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct AvxInputContext;
+
+struct WebmInputContext {
+ void *reader;
+ void *segment;
+ uint8_t *buffer;
+ const void *cluster;
+ const void *block_entry;
+ const void *block;
+ int block_frame_index;
+ int video_track_index;
+ uint64_t timestamp_ns;
+ int is_key_frame;
+ int reached_eos;
+};
+
+// Checks if the input is a WebM file. If so, initializes WebMInputContext so
+// that webm_read_frame can be called to retrieve a video frame.
+// Returns 1 on success and 0 on failure or input is not WebM file.
+// TODO(vigneshv): Refactor this function into two smaller functions specific
+// to their task.
+int file_is_webm(struct WebmInputContext *webm_ctx,
+ struct AvxInputContext *aom_ctx);
+
+// Reads a WebM Video Frame. Memory for the buffer is created, owned and managed
+// by this function. For the first call, |buffer| should be NULL and
+// |*buffer_size| should be 0. Once all the frames are read and used,
+// webm_free() should be called, otherwise there will be a leak.
+// Parameters:
+// webm_ctx - WebmInputContext object
+// buffer - pointer where the frame data will be filled.
+// bytes_read - pointer to bytes read.
+// buffer_size - pointer to buffer size.
+// Return values:
+// 0 - Success
+// 1 - End of Stream
+// -1 - Error
+int webm_read_frame(struct WebmInputContext *webm_ctx, uint8_t **buffer,
+ size_t *bytes_read, size_t *buffer_size);
+
+// Guesses the frame rate of the input file based on the container timestamps.
+int webm_guess_framerate(struct WebmInputContext *webm_ctx,
+ struct AvxInputContext *aom_ctx);
+
+// Resets the WebMInputContext.
+void webm_free(struct WebmInputContext *webm_ctx);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif // AOM_COMMON_WEBMDEC_H_