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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// 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/logging.h"
#include "base/macros.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 {
public:
// Read the given amount of bytes into data, returns the number of bytes read
// if successful, kReadError otherwise.
virtual int Read(int size, uint8_t* data) = 0;
// Returns true and the current file position for this file, false if the
// file position could not be retrieved.
virtual bool GetPosition(int64_t* position_out) = 0;
// Returns true if the file position could be set, false otherwise.
virtual bool SetPosition(int64_t position) = 0;
// Returns true and the file size, false if the file size could not be
// retrieved.
virtual bool GetSize(int64_t* size_out) = 0;
// Returns false if this protocol supports random seeking.
virtual bool IsStreaming() = 0;
};
class MEDIA_EXPORT FFmpegGlue {
public:
static void InitializeFFmpeg();
// See file documentation for usage. |protocol| must outlive FFmpegGlue.
explicit FFmpegGlue(FFmpegURLProtocol* protocol);
~FFmpegGlue();
// Opens an AVFormatContext specially prepared to process reads and seeks
// through the FFmpegURLProtocol provided during construction.
// |is_local_file| is an optional parameter used for metrics reporting.
bool OpenContext(bool is_local_file = false);
AVFormatContext* format_context() { return format_context_; }
// Returns the container name.
// Note that it is only available after calling OpenContext.
container_names::MediaContainerName container() const {
DCHECK(open_called_);
return container_;
}
// Used on Android to switch to using the native MediaPlayer to play HLS.
bool detected_hls() { return detected_hls_; }
private:
bool open_called_ = false;
bool detected_hls_ = false;
AVFormatContext* format_context_ = nullptr;
std::unique_ptr<AVIOContext, ScopedPtrAVFree> avio_context_;
container_names::MediaContainerName container_ =
container_names::CONTAINER_UNKNOWN;
DISALLOW_COPY_AND_ASSIGN(FFmpegGlue);
};
} // namespace media
#endif // MEDIA_FILTERS_FFMPEG_GLUE_H_
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