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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.
#ifndef MEDIA_FILTERS_VPX_VIDEO_DECODER_H_
#define MEDIA_FILTERS_VPX_VIDEO_DECODER_H_
#include "base/callback.h"
#include "base/macros.h"
#include "base/sequence_checker.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 {
class FrameBufferPool;
// 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 {
public:
explicit VpxVideoDecoder(OffloadState offload_state = OffloadState::kNormal);
~VpxVideoDecoder() override;
// VideoDecoder implementation.
std::string GetDisplayName() const override;
void Initialize(const VideoDecoderConfig& config,
bool low_delay,
CdmContext* cdm_context,
const InitCB& init_cb,
const OutputCB& output_cb,
const WaitingCB& waiting_cb) override;
void Decode(scoped_refptr<DecoderBuffer> buffer,
const DecodeCB& decode_cb) override;
void Reset(const base::Closure& reset_cb) override;
// OffloadableVideoDecoder implementation.
void Detach() override;
private:
enum DecoderState {
kUninitialized,
kNormal,
kFlushCodec,
kDecodeFinished,
kError
};
// Return values for decoding alpha plane.
enum AlphaDecodeStatus {
kAlphaPlaneProcessed, // Alpha plane (if found) was decoded successfully.
kNoAlphaPlaneData, // Alpha plane was found, but decoder did not return any
// data.
kAlphaPlaneError // Fatal error occured when trying to decode alpha plane.
};
// Handles (re-)initializing the decoder with a (new) config.
// Returns true when initialization was successful.
bool ConfigureDecoder(const VideoDecoderConfig& config);
void CloseDecoder();
// Try to decode |buffer| into |video_frame|. Return true if all decoding
// succeeded. Note that decoding can succeed and still |video_frame| be
// nullptr if there has been a partial decoding.
bool VpxDecode(const DecoderBuffer* buffer,
scoped_refptr<VideoFrame>* video_frame);
bool CopyVpxImageToVideoFrame(const struct vpx_image* vpx_image,
const struct vpx_image* vpx_image_alpha,
scoped_refptr<VideoFrame>* video_frame);
AlphaDecodeStatus DecodeAlphaPlane(const struct vpx_image* vpx_image,
const struct vpx_image** vpx_image_alpha,
const DecoderBuffer* buffer);
// Indicates if the decoder is being wrapped by OffloadVideoDecoder; controls
// whether callbacks are bound to the current loop on calls.
const bool bind_callbacks_;
SEQUENCE_CHECKER(sequence_checker_);
// |state_| must only be read and written to on |offload_task_runner_| if it
// is non-null and there are outstanding tasks on the offload thread.
DecoderState state_ = kUninitialized;
OutputCB output_cb_;
VideoDecoderConfig config_;
std::unique_ptr<vpx_codec_ctx> vpx_codec_;
std::unique_ptr<vpx_codec_ctx> vpx_codec_alpha_;
// |memory_pool_| is a single-threaded memory pool used for VP9 decoding
// with no alpha. |frame_pool_| is used for all other cases.
scoped_refptr<FrameBufferPool> memory_pool_;
VideoFramePool frame_pool_;
DISALLOW_COPY_AND_ASSIGN(VpxVideoDecoder);
};
// Helper class for creating a VpxVideoDecoder which will offload > 720p VP9
// content from the media thread.
class OffloadingVpxVideoDecoder : public OffloadingVideoDecoder {
public:
OffloadingVpxVideoDecoder()
: OffloadingVideoDecoder(
1024,
std::vector<VideoCodec>(1, kCodecVP9),
std::make_unique<VpxVideoDecoder>(
OffloadableVideoDecoder::OffloadState::kOffloaded)) {}
};
} // namespace media
#endif // MEDIA_FILTERS_VPX_VIDEO_DECODER_H_
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