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LibVideo/VP9: Add a FIXME to keep render_and_frame_size_different

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The flag should be used to determine whether the pixel aspect ratio
should be updated when frame/render sizes change in the bitstream.
This commit is contained in:
Zaggy1024 2022-11-22 02:36:23 -06:00 • committed by Andreas Kling
parent 3259c99cab
commit 9f573264ea
1 changed files with 7 additions and 0 deletions
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7
Userland/Libraries/LibVideo/VP9/Parser.cpp
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@ -309,6 +309,13 @@ DecoderErrorOr<Gfx::Size<u32>> Parser::parse_frame_size()
DecoderErrorOr<Gfx::Size<u32>> Parser::parse_render_size(Gfx::Size<u32> frame_size)
{
// FIXME: This function should save this bit as a value in the FrameContext. The bit can be
// used in files where the pixel aspect ratio changes between samples in the video.
// If the bit is set, the pixel aspect ratio should be recalculated, whereas if only
// the frame size has changed and the render size is unadjusted, then the pixel aspect
// ratio should be retained and the new render size determined based on that.
// See the Firefox source code here:
// https://searchfox.org/mozilla-central/source/dom/media/platforms/wrappers/MediaChangeMonitor.cpp#268-276
if (!TRY_READ(m_bit_stream->read_bit()))
return frame_size;
return Gfx::Size<u32> { TRY_READ(m_bit_stream->read_f16()) + 1, TRY_READ(m_bit_stream->read_f16()) + 1 };