/* *  Copyright (c) 2013 The WebM project authors. All Rights Reserved. * *  Use of this source code is governed by a BSD-style license *  that can be found in the LICENSE file in the root of the source *  tree. An additional intellectual property rights grant can be found *  in the file PATENTS.  All contributing project authors may *  be found in the AUTHORS file in the root of the source tree. */#ifndef VPX_WEBMDEC_H_#define VPX_WEBMDEC_H_ #include "./tools_common.h" #ifdef __cplusplusextern "C" {#endif struct VpxInputContext; 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 VpxInputContext *vpx_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.//      buffer_size - pointer to buffer size.// Return values://      0 - Success//      1 - End of Stream//     -1 - Errorint webm_read_frame(struct WebmInputContext *webm_ctx, uint8_t **buffer,                    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 VpxInputContext *vpx_ctx); // Resets the WebMInputContext.void webm_free(struct WebmInputContext *webm_ctx); #ifdef __cplusplus}  // extern "C"#endif #endif  // VPX_WEBMDEC_H_