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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.
48 lines
1.6 KiB
C++
48 lines
1.6 KiB
C++
/*
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* Copyright (c) 2022, Gregory Bertilson <zaggy1024@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibTest/TestCase.h>
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#include <LibVideo/MatroskaReader.h>
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#include <LibVideo/VP9/Decoder.h>
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static void decode_video(StringView path, size_t expected_frame_count)
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{
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auto matroska_document = Video::MatroskaReader::MatroskaReader::parse_matroska_from_file(path);
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VERIFY(matroska_document);
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auto video_track_optional = matroska_document->track_for_track_type(Video::TrackEntry::TrackType::Video);
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VERIFY(video_track_optional.has_value());
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auto video_track_entry = video_track_optional.value();
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size_t frame_count = 0;
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size_t cluster_index, block_index, frame_index;
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Video::VP9::Decoder vp9_decoder;
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for (cluster_index = 0; cluster_index < matroska_document->clusters().size(); cluster_index++) {
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auto const& cluster = matroska_document->clusters()[cluster_index];
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for (block_index = 0; block_index < cluster.blocks().size(); block_index++) {
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auto const& block = cluster.blocks()[block_index];
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if (block.track_number() != video_track_entry.track_number())
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continue;
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for (frame_index = 0; frame_index < block.frames().size(); frame_index++) {
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MUST(vp9_decoder.receive_sample(block.frames()[frame_index]));
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frame_count++;
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}
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}
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}
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VERIFY(frame_count == expected_frame_count);
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}
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TEST_CASE(webm_in_vp9)
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{
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decode_video("./vp9_in_webm.webm"sv, 25);
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}
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BENCHMARK_CASE(vp9_4k)
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{
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decode_video("./vp9_4k.webm"sv, 2);
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}
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