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LibVideo: Make new DecoderError class to report useful errors

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This allows runtime strings, so we can format the errors to make them
more helpful. Errors in the VP9 decoder will now print out a function,
filename and line number for where a read or bitstream requirement
has failed.

The DecoderErrorCategory enum will classify the errors so library users
can show general user-friendly error messages, while providing the
debug information separately.

Any non-DecoderErrorOr<> results can be wrapped by DECODER_TRY to
return from decoder functions. This will also add the extra information
mentioned above to the error message.
This commit is contained in:
Zaggy1024 2022-09-13 19:40:37 -05:00 • committed by Andrew Kaster
parent 72efd9a5ff
commit da9ff31166
5 changed files with 369 additions and 278 deletions
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18
Userland/Libraries/LibVideo/VP9/Decoder.h
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@ -7,9 +7,11 @@
#pragma once
#include "Parser.h"
#include <AK/ByteBuffer.h>
#include <AK/Error.h>
#include <LibVideo/DecoderError.h>
#include "Parser.h"
namespace Video::VP9 {
@ -18,27 +20,27 @@ class Decoder {
public:
Decoder();
ErrorOr<void> decode_frame(ByteBuffer const&);
DecoderErrorOr<void> decode_frame(ByteBuffer const&);
void dump_frame_info();
private:
/* (8.4) Probability Adaptation Process */
u8 merge_prob(u8 pre_prob, u8 count_0, u8 count_1, u8 count_sat, u8 max_update_factor);
u8 merge_probs(int const* tree, int index, u8* probs, u8* counts, u8 count_sat, u8 max_update_factor);
ErrorOr<void> adapt_coef_probs();
ErrorOr<void> adapt_non_coef_probs();
DecoderErrorOr<void> adapt_coef_probs();
DecoderErrorOr<void> adapt_non_coef_probs();
void adapt_probs(int const* tree, u8* probs, u8* counts);
u8 adapt_prob(u8 prob, u8 counts[2]);
/* (8.5) Prediction Processes */
ErrorOr<void> predict_intra(size_t plane, u32 x, u32 y, bool have_left, bool have_above, bool not_on_right, TXSize tx_size, u32 block_index);
ErrorOr<void> predict_inter(size_t plane, u32 x, u32 y, u32 w, u32 h, u32 block_index);
DecoderErrorOr<void> predict_intra(size_t plane, u32 x, u32 y, bool have_left, bool have_above, bool not_on_right, TXSize tx_size, u32 block_index);
DecoderErrorOr<void> predict_inter(size_t plane, u32 x, u32 y, u32 w, u32 h, u32 block_index);
/* (8.6) Reconstruction and Dequantization */
ErrorOr<void> reconstruct(size_t plane, u32 x, u32 y, TXSize size);
DecoderErrorOr<void> reconstruct(size_t plane, u32 transform_block_x, u32 transform_block_y, TXSize transform_block_size);
/* (8.10) Reference Frame Update Process */
ErrorOr<void> update_reference_frames();
DecoderErrorOr<void> update_reference_frames();
NonnullOwnPtr<Parser> m_parser;
};