blob: a0be02e4a89d507616ee4a32774bdbd3a3e3e3b6 [file] [log] [blame]
// 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.
#include "base/callback.h"
#include "base/macros.h"
#include "base/sequence_checker.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/frame_buffer_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]
class MEDIA_EXPORT VpxVideoDecoder : public OffloadableVideoDecoder {
static SupportedVideoDecoderConfigs SupportedConfigs();
explicit VpxVideoDecoder(OffloadState offload_state = OffloadState::kNormal);
VpxVideoDecoder(const VpxVideoDecoder&) = delete;
VpxVideoDecoder& operator=(const VpxVideoDecoder&) = delete;
~VpxVideoDecoder() override;
// VideoDecoder implementation.
VideoDecoderType GetDecoderType() const override;
void Initialize(const VideoDecoderConfig& config,
bool low_delay,
CdmContext* cdm_context,
InitCB init_cb,
const OutputCB& output_cb,
const WaitingCB& waiting_cb) override;
void Decode(scoped_refptr<DecoderBuffer> buffer, DecodeCB decode_cb) override;
void Reset(base::OnceClosure reset_cb) override;
// OffloadableVideoDecoder implementation.
void Detach() override;
void force_allocation_error_for_testing() {
enum class DecoderState { kUninitialized, kNormal, 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_;
// |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_ = DecoderState::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_;
// Helper class for creating a VpxVideoDecoder which will offload > 720p VP9
// content from the media thread.
class OffloadingVpxVideoDecoder : public OffloadingVideoDecoder {
: OffloadingVideoDecoder(
std::vector<VideoCodec>(1, VideoCodec::kVP9),
OffloadableVideoDecoder::OffloadState::kOffloaded)) {}
} // namespace media