2 * Copyright (c) 2013 The WebM project authors. All Rights Reserved.
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
10 #ifndef VPX_WEBMDEC_H_
11 #define VPX_WEBMDEC_H_
13 #include "./tools_common.h"
19 struct VpxInputContext;
21 struct WebmInputContext {
26 const void *block_entry;
28 int block_frame_index;
29 int video_track_index;
30 uint64_t timestamp_ns;
35 // Checks if the input is a WebM file. If so, initializes WebMInputContext so
36 // that webm_read_frame can be called to retrieve a video frame.
37 // Returns 1 on success and 0 on failure or input is not WebM file.
38 // TODO(vigneshv): Refactor this function into two smaller functions specific
40 int file_is_webm(struct WebmInputContext *webm_ctx,
41 struct VpxInputContext *vpx_ctx);
43 // Reads a WebM Video Frame. Memory for the buffer is created, owned and managed
44 // by this function. For the first call, |buffer| should be NULL and
45 // |*buffer_size| should be 0. Once all the frames are read and used,
46 // webm_free() should be called, otherwise there will be a leak.
48 // webm_ctx - WebmInputContext object
49 // buffer - pointer where the frame data will be filled.
50 // buffer_size - pointer to buffer size.
55 int webm_read_frame(struct WebmInputContext *webm_ctx, uint8_t **buffer,
58 // Guesses the frame rate of the input file based on the container timestamps.
59 int webm_guess_framerate(struct WebmInputContext *webm_ctx,
60 struct VpxInputContext *vpx_ctx);
62 // Resets the WebMInputContext.
63 void webm_free(struct WebmInputContext *webm_ctx);
69 #endif // VPX_WEBMDEC_H_