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LibVideo: Implement inter prediction

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This enables the second frame of the test video to be decoded.

It appears that the test video uses a superframe (group of multiple
frames) for the first chunk of the file, but we haven't implemented
superframe parsing.

We also ignore the show_frame flag, so for now, this
means that the second frame read out is shown when it should not be. To
fix this, another error type needs to be implemented that is "thrown" to
decoder's client so they know to send another sample buffer.
This commit is contained in:
Zaggy1024 2022-09-21 20:16:40 -05:00 • committed by Andrew Kaster
parent 50d4217dbc
commit b0187dfc27
6 changed files with 487 additions and 51 deletions
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68
Userland/Libraries/LibVideo/VP9/LookupTables.h
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@ -331,4 +331,72 @@ static constexpr u8 counter_to_context[19] = {
BOTH_INTRA
};
// Coefficients used by predict_inter
static constexpr i32 subpel_filters[4][16][8] = {
{ { 0, 0, 0, 128, 0, 0, 0, 0 },
{ 0, 1, -5, 126, 8, -3, 1, 0 },
{ -1, 3, -10, 122, 18, -6, 2, 0 },
{ -1, 4, -13, 118, 27, -9, 3, -1 },
{ -1, 4, -16, 112, 37, -11, 4, -1 },
{ -1, 5, -18, 105, 48, -14, 4, -1 },
{ -1, 5, -19, 97, 58, -16, 5, -1 },
{ -1, 6, -19, 88, 68, -18, 5, -1 },
{ -1, 6, -19, 78, 78, -19, 6, -1 },
{ -1, 5, -18, 68, 88, -19, 6, -1 },
{ -1, 5, -16, 58, 97, -19, 5, -1 },
{ -1, 4, -14, 48, 105, -18, 5, -1 },
{ -1, 4, -11, 37, 112, -16, 4, -1 },
{ -1, 3, -9, 27, 118, -13, 4, -1 },
{ 0, 2, -6, 18, 122, -10, 3, -1 },
{ 0, 1, -3, 8, 126, -5, 1, 0 } },
{ { 0, 0, 0, 128, 0, 0, 0, 0 },
{ -3, -1, 32, 64, 38, 1, -3, 0 },
{ -2, -2, 29, 63, 41, 2, -3, 0 },
{ -2, -2, 26, 63, 43, 4, -4, 0 },
{ -2, -3, 24, 62, 46, 5, -4, 0 },
{ -2, -3, 21, 60, 49, 7, -4, 0 },
{ -1, -4, 18, 59, 51, 9, -4, 0 },
{ -1, -4, 16, 57, 53, 12, -4, -1 },
{ -1, -4, 14, 55, 55, 14, -4, -1 },
{ -1, -4, 12, 53, 57, 16, -4, -1 },
{ 0, -4, 9, 51, 59, 18, -4, -1 },
{ 0, -4, 7, 49, 60, 21, -3, -2 },
{ 0, -4, 5, 46, 62, 24, -3, -2 },
{ 0, -4, 4, 43, 63, 26, -2, -2 },
{ 0, -3, 2, 41, 63, 29, -2, -2 },
{ 0, -3, 1, 38, 64, 32, -1, -3 } },
{ { 0, 0, 0, 128, 0, 0, 0, 0 },
{ -1, 3, -7, 127, 8, -3, 1, 0 },
{ -2, 5, -13, 125, 17, -6, 3, -1 },
{ -3, 7, -17, 121, 27, -10, 5, -2 },
{ -4, 9, -20, 115, 37, -13, 6, -2 },
{ -4, 10, -23, 108, 48, -16, 8, -3 },
{ -4, 10, -24, 100, 59, -19, 9, -3 },
{ -4, 11, -24, 90, 70, -21, 10, -4 },
{ -4, 11, -23, 80, 80, -23, 11, -4 },
{ -4, 10, -21, 70, 90, -24, 11, -4 },
{ -3, 9, -19, 59, 100, -24, 10, -4 },
{ -3, 8, -16, 48, 108, -23, 10, -4 },
{ -2, 6, -13, 37, 115, -20, 9, -4 },
{ -2, 5, -10, 27, 121, -17, 7, -3 },
{ -1, 3, -6, 17, 125, -13, 5, -2 },
{ 0, 1, -3, 8, 127, -7, 3, -1 } },
{ { 0, 0, 0, 128, 0, 0, 0, 0 },
{ 0, 0, 0, 120, 8, 0, 0, 0 },
{ 0, 0, 0, 112, 16, 0, 0, 0 },
{ 0, 0, 0, 104, 24, 0, 0, 0 },
{ 0, 0, 0, 96, 32, 0, 0, 0 },
{ 0, 0, 0, 88, 40, 0, 0, 0 },
{ 0, 0, 0, 80, 48, 0, 0, 0 },
{ 0, 0, 0, 72, 56, 0, 0, 0 },
{ 0, 0, 0, 64, 64, 0, 0, 0 },
{ 0, 0, 0, 56, 72, 0, 0, 0 },
{ 0, 0, 0, 48, 80, 0, 0, 0 },
{ 0, 0, 0, 40, 88, 0, 0, 0 },
{ 0, 0, 0, 32, 96, 0, 0, 0 },
{ 0, 0, 0, 24, 104, 0, 0, 0 },
{ 0, 0, 0, 16, 112, 0, 0, 0 },
{ 0, 0, 0, 8, 120, 0, 0, 0 } }
};
}