chromium/media/filters/vpx_video_decoder.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.

#ifndef MEDIA_FILTERS_VPX_VIDEO_DECODER_H_
#define MEDIA_FILTERS_VPX_VIDEO_DECODER_H_

#include "base/functional/callback.h"
#include "base/sequence_checker.h"
#include "media/base/frame_buffer_pool.h"
#include "media/base/supported_video_decoder_config.h"
#include "media/base/video_decoder.h"
#include "media/base/video_decoder_config.h"
#include "media/base/video_frame.h"
#include "media/base/video_frame_pool.h"
#include "media/filters/offloading_video_decoder.h"

struct vpx_codec_ctx;
struct vpx_image;

namespace media {

// Libvpx video decoder wrapper.
// Note: VpxVideoDecoder accepts only YV12A VP8 content or VP9 content. This is
// done to avoid usurping FFmpeg for all VP8 decoding, because the FFmpeg VP8
// decoder is faster than the libvpx VP8 decoder.
// Alpha channel, if any, is sent in the DecoderBuffer's side_data() as a frame
// on its own of which the Y channel is taken [1].
// [1] http://wiki.webmproject.org/alpha-channel
class MEDIA_EXPORT VpxVideoDecoder : public OffloadableVideoDecoder { … };

// Helper class for creating a VpxVideoDecoder which will offload > 720p VP9
// content from the media thread.
class OffloadingVpxVideoDecoder : public OffloadingVideoDecoder { … };

}  // namespace media

#endif  // MEDIA_FILTERS_VPX_VIDEO_DECODER_H_