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- // 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/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();
- VP8Accelerator(const VP8Accelerator&) = delete;
- VP8Accelerator& operator=(const VP8Accelerator&) = delete;
- 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;
- };
- explicit VP8Decoder(
- std::unique_ptr<VP8Accelerator> accelerator,
- const VideoColorSpace& container_color_space = VideoColorSpace());
- VP8Decoder(const VP8Decoder&) = delete;
- VP8Decoder& operator=(const VP8Decoder&) = delete;
- ~VP8Decoder() override;
- // AcceleratedVideoDecoder implementation.
- void SetStream(int32_t id, const DecoderBuffer& decoder_buffer) override;
- [[nodiscard]] bool Flush() override;
- void Reset() override;
- [[nodiscard]] DecodeResult Decode() override;
- gfx::Size GetPicSize() const override;
- gfx::Rect GetVisibleRect() const override;
- VideoCodecProfile GetProfile() const override;
- uint8_t GetBitDepth() const override;
- VideoChromaSampling GetChromaSampling() 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_;
- // Color space provided by the container.
- const VideoColorSpace container_color_space_;
- };
- } // namespace media
- #endif // MEDIA_GPU_VP8_DECODER_H_
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