| // Copyright 2015 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_GPU_VP8_DECODER_H_ |
| #define MEDIA_GPU_VP8_DECODER_H_ |
| |
| #include <stddef.h> |
| #include <stdint.h> |
| |
| #include <memory> |
| |
| #include "base/macros.h" |
| #include "base/memory/ref_counted.h" |
| #include "media/gpu/accelerated_video_decoder.h" |
| #include "media/gpu/vp8_picture.h" |
| #include "media/gpu/vp8_reference_frame_vector.h" |
| #include "media/parsers/vp8_parser.h" |
| |
| namespace media { |
| |
| // Clients of this class are expected to pass raw VP8 stream and are expected |
| // to provide an implementation of VP8Accelerator for offloading final steps |
| // of the decoding process. |
| // |
| // This class must be created, called and destroyed on a single thread, and |
| // does nothing internally on any other thread. |
| class MEDIA_GPU_EXPORT VP8Decoder : public AcceleratedVideoDecoder { |
| public: |
| class MEDIA_GPU_EXPORT VP8Accelerator { |
| public: |
| VP8Accelerator(); |
| virtual ~VP8Accelerator(); |
| |
| // Create a new VP8Picture that the decoder client can use for decoding |
| // and pass back to this accelerator for decoding or reference. |
| // When the picture is no longer needed by decoder, it will just drop |
| // its reference to it, and it may do so at any time. |
| // Note that this may return nullptr if accelerator is not able to provide |
| // any new pictures at given time. The decoder is expected to handle |
| // this situation as normal and return from Decode() with kRanOutOfSurfaces. |
| virtual scoped_refptr<VP8Picture> CreateVP8Picture() = 0; |
| |
| // Submits decode for |pic|, using |reference_frames| as references, as per |
| // VP8 specification. Returns true if successful. |
| virtual bool SubmitDecode( |
| scoped_refptr<VP8Picture> pic, |
| const Vp8ReferenceFrameVector& reference_frames) = 0; |
| |
| // Schedule output (display) of |pic|. Note that returning from this |
| // method does not mean that |pic| has already been outputted (displayed), |
| // but guarantees that all pictures will be outputted in the same order |
| // as this method was called for them. Decoder may drop its reference |
| // to |pic| after calling this method. |
| // Return true if successful. |
| virtual bool OutputPicture(scoped_refptr<VP8Picture> pic) = 0; |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(VP8Accelerator); |
| }; |
| |
| explicit VP8Decoder(std::unique_ptr<VP8Accelerator> accelerator); |
| ~VP8Decoder() override; |
| |
| // AcceleratedVideoDecoder implementation. |
| void SetStream(int32_t id, const DecoderBuffer& decoder_buffer) override; |
| bool Flush() override WARN_UNUSED_RESULT; |
| void Reset() override; |
| DecodeResult Decode() override WARN_UNUSED_RESULT; |
| gfx::Size GetPicSize() const override; |
| gfx::Rect GetVisibleRect() const override; |
| VideoCodecProfile GetProfile() const override; |
| size_t GetRequiredNumOfPictures() const override; |
| size_t GetNumReferenceFrames() const override; |
| |
| private: |
| bool DecodeAndOutputCurrentFrame(scoped_refptr<VP8Picture> pic); |
| |
| enum State { |
| kNeedStreamMetadata, // After initialization, need a keyframe. |
| kDecoding, // Ready to decode from any point. |
| kAfterReset, // After Reset(), need a resume point. |
| kError, // Error in decode, can't continue. |
| }; |
| |
| State state_; |
| |
| Vp8Parser parser_; |
| |
| std::unique_ptr<Vp8FrameHeader> curr_frame_hdr_; |
| Vp8ReferenceFrameVector ref_frames_; |
| |
| // Current stream buffer id; to be assigned to pictures decoded from it. |
| static constexpr int32_t kInvalidId = -1; |
| int32_t stream_id_ = kInvalidId; |
| int32_t last_decoded_stream_id_ = kInvalidId; |
| size_t size_change_failure_counter_ = 0; |
| |
| const uint8_t* curr_frame_start_; |
| size_t frame_size_; |
| |
| gfx::Size pic_size_; |
| int horizontal_scale_; |
| int vertical_scale_; |
| |
| const std::unique_ptr<VP8Accelerator> accelerator_; |
| |
| DISALLOW_COPY_AND_ASSIGN(VP8Decoder); |
| }; |
| |
| } // namespace media |
| |
| #endif // MEDIA_GPU_VP8_DECODER_H_ |