chromium/media/filters/ffmpeg_glue.h

// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// FFmpegGlue is an interface between FFmpeg and Chrome used to proxy FFmpeg's
// read and seek requests to Chrome's internal data structures.  The glue works
// through the AVIO interface provided by FFmpeg.
//
// AVIO works through a special AVIOContext created through avio_alloc_context()
// which is attached to the AVFormatContext used for demuxing.  The AVIO context
// is initialized with read and seek methods which FFmpeg calls when necessary.
//
// During OpenContext() FFmpegGlue will tell FFmpeg to use Chrome's AVIO context
// by passing NULL in for the filename parameter to avformat_open_input().  All
// FFmpeg operations using the configured AVFormatContext will then redirect
// reads and seeks through the glue.
//
// The glue in turn processes those read and seek requests using the
// FFmpegURLProtocol provided during construction.

#ifndef MEDIA_FILTERS_FFMPEG_GLUE_H_
#define MEDIA_FILTERS_FFMPEG_GLUE_H_

#include <stdint.h>

#include <memory>

#include "base/check.h"
#include "base/memory/raw_ptr_exclusion.h"
#include "media/base/container_names.h"
#include "media/base/media_export.h"
#include "media/ffmpeg/ffmpeg_deleters.h"

struct AVFormatContext;
struct AVIOContext;

namespace media {

class MEDIA_EXPORT FFmpegURLProtocol { … };

class MEDIA_EXPORT FFmpegGlue { … };

}  // namespace media

#endif  // MEDIA_FILTERS_FFMPEG_GLUE_H_