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LibVideo: Allow the VP9 decoder to decode ultra high resolution video

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Previously, some integer overflows and truncations were causing parsing
errors for 4K videos, with those fixed it can fully decode 8K video.

This adds a test to ensure that 4K video will continue to be decoded.

Note: There seems to be unexpectedly high memory usage while decoding
them, causing 8K video to require more than a gigabyte of RAM. (!!!)
This commit is contained in:
Zaggy1024 2022-10-01 17:28:37 -05:00 committed by Andrew Kaster
parent f894e8be62
commit 41cb705b47
Notes: sideshowbarker 2024-07-17 07:06:47 +09:00 
Author: https://github.com/Zaggy1024
Commit: https://github.com/SerenityOS/serenity/commit/41cb705b47
Pull-request: https://github.com/SerenityOS/serenity/pull/15541
Reviewed-by: https://github.com/FireFox317
Reviewed-by: https://github.com/gmta
6 changed files with 21 additions and 9 deletions
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1
Tests/LibVideo/CMakeLists.txt
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@ -7,3 +7,4 @@ foreach(source IN LISTS TEST_SOURCES)
endforeach()
install(FILES vp9_in_webm.webm DESTINATION usr/Tests/LibVideo)
install(FILES vp9_4k.webm DESTINATION usr/Tests/LibVideo)

19
Tests/LibVideo/TestVP9Decode.cpp
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@ -9,14 +9,15 @@
#include <LibVideo/MatroskaReader.h>
#include <LibVideo/VP9/Decoder.h>
TEST_CASE(webm_in_vp9)
static void decode_video(StringView path, size_t expected_frame_count)
{
auto matroska_document = Video::MatroskaReader::MatroskaReader::parse_matroska_from_file("./vp9_in_webm.webm"sv);
auto matroska_document = Video::MatroskaReader::MatroskaReader::parse_matroska_from_file(path);
VERIFY(matroska_document);
auto video_track_optional = matroska_document->track_for_track_type(Video::TrackEntry::TrackType::Video);
VERIFY(video_track_optional.has_value());
auto video_track_entry = video_track_optional.value();
size_t frame_count = 0;
size_t cluster_index, block_index, frame_index;
Video::VP9::Decoder vp9_decoder;
@ -29,9 +30,19 @@ TEST_CASE(webm_in_vp9)
for (frame_index = 0; frame_index < block.frames().size(); frame_index++) {
MUST(vp9_decoder.decode(block.frames()[frame_index]));
frame_count++;
}
}
}
VERIFY(cluster_index == 1 && block_index == 25 && frame_index == 1);
VERIFY(frame_count == expected_frame_count);
}
TEST_CASE(webm_in_vp9)
{
decode_video("./vp9_in_webm.webm"sv, 25);
}
BENCHMARK_CASE(vp9_4k)
{
decode_video("./vp9_4k.webm"sv, 2);
}

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Tests/LibVideo/vp9_4k.webm Normal file
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2
Userland/Libraries/LibVideo/VP9/Decoder.cpp
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@ -1097,7 +1097,7 @@ inline i32 Decoder::round_2(T value, u8 bits)
inline bool check_bounds(i64 value, u8 bits)
{
const i64 maximum = (1u << (bits - 1u)) - 1u;
i64 const maximum = (1ll << (bits - 1ll)) - 1ll;
return value >= ~maximum && value <= maximum;
}

6
Userland/Libraries/LibVideo/VP9/Parser.cpp
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@ -979,8 +979,8 @@ DecoderErrorOr<void> Parser::decode_block(u32 row, u32 col, BlockSubsize subsize
// write out of bounds. This check seems consistent with libvpx.
// See here:
// https://github.com/webmproject/libvpx/blob/705bf9de8c96cfe5301451f1d7e5c90a41c64e5f/vp9/decoder/vp9_decodeframe.c#L917
auto maximum_block_y = min(num_8x8_blocks_high_lookup[subsize], m_mi_rows - row);
auto maximum_block_x = min(num_8x8_blocks_wide_lookup[subsize], m_mi_cols - col);
auto maximum_block_y = min<u32>(num_8x8_blocks_high_lookup[subsize], m_mi_rows - row);
auto maximum_block_x = min<u32>(num_8x8_blocks_wide_lookup[subsize], m_mi_cols - col);
for (size_t y = 0; y < maximum_block_y; y++) {
for (size_t x = 0; x < maximum_block_x; x++) {
@ -1337,7 +1337,7 @@ DecoderErrorOr<i32> Parser::read_mv_component(u8 component)
return (mv_sign ? -1 : 1) * static_cast<i32>(mag);
}
Gfx::Point<size_t> Parser::get_decoded_point_for_plane(u8 column, u8 row, u8 plane)
Gfx::Point<size_t> Parser::get_decoded_point_for_plane(u32 column, u32 row, u8 plane)
{
if (plane == 0)
return { column * 8, row * 8 };

2
Userland/Libraries/LibVideo/VP9/Parser.h
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@ -141,7 +141,7 @@ private:
void scale_mv(u8 ref_list, ReferenceFrame ref_frame);
void add_mv_ref_list(u8 ref_list);
Gfx::Point<size_t> get_decoded_point_for_plane(u8 row, u8 column, u8 plane);
Gfx::Point<size_t> get_decoded_point_for_plane(u32 row, u32 column, u8 plane);
Gfx::Size<size_t> get_decoded_size_for_plane(u8 plane);
u8 m_profile { 0 };