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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;
int64_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_
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