70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
/*
|
|
* 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 WEBMDEC_H_
|
|
#define WEBMDEC_H_
|
|
|
|
#include "./tools_common.h"
|
|
|
|
#ifdef __cplusplus
|
|
extern "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 - Error
|
|
int 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 // WEBMDEC_H_
|