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LibVideo: Add VideoFrame class for decoded video frames

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The class is virtual and has one subclass, SubsampledYUVFrame, which
is used by the VP9 decoder to return a single frame. The
output_to_bitmap(Bitmap&) function can be used to set pixels on an
existing bitmap of the correct size to the RGB values that
should be displayed. The to_bitmap() function will allocate a new bitmap
and fill it using output_to_bitmap.

This new class also implements bilinear scaling of the subsampled U and
V planes so that subsampled videos' colors will appear smoother.
This commit is contained in:
Zaggy1024 2022-10-08 18:36:57 -05:00 • committed by Andreas Kling
parent 30189186e9
commit 074f771b59
8 changed files with 244 additions and 70 deletions
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19
Userland/Libraries/LibVideo/VP9/Decoder.h
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@ -9,9 +9,11 @@
#include <AK/ByteBuffer.h>
#include <AK/Error.h>
#include <AK/NonnullOwnPtr.h>
#include <AK/Span.h>
#include <LibVideo/Color/CodingIndependentCodePoints.h>
#include <LibVideo/DecoderError.h>
#include <LibVideo/VideoFrame.h>
#include "Parser.h"
@ -23,23 +25,16 @@ class Decoder {
public:
Decoder();
/* (8.1) General */
DecoderErrorOr<void> decode(Span<const u8>);
DecoderErrorOr<void> decode(ByteBuffer const&);
DecoderErrorOr<void> receive_sample(Span<u8 const>);
DecoderErrorOr<void> receive_sample(ByteBuffer const&);
void dump_frame_info();
// FIXME: These functions should be replaced by a struct that contains
// all the information needed to display a frame.
Vector<u16> const& get_output_buffer_for_plane(u8 plane) const;
Gfx::Size<size_t> get_y_plane_size();
bool get_uv_subsampling_y();
bool get_uv_subsampling_x();
CodingIndependentCodePoints get_cicp_color_space();
u8 get_bit_depth();
DecoderErrorOr<NonnullOwnPtr<VideoFrame>> get_decoded_frame();
private:
typedef i32 Intermediate;
DecoderErrorOr<void> decode_frame(Span<const u8>);
DecoderErrorOr<void> decode_frame(Span<u8 const>);
DecoderErrorOr<void> allocate_buffers();
Vector<Intermediate>& get_temp_buffer(u8 plane);
@ -139,6 +134,8 @@ private:
/* (8.10) Reference Frame Update Process */
DecoderErrorOr<void> update_reference_frames();
inline CodingIndependentCodePoints get_cicp_color_space();
NonnullOwnPtr<Parser> m_parser;
struct {