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LibVideo: Implement VP9 intra-predicted frame decoding

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The first keyframe of the test video can be decoded with these changes.

Raw memory allocations in the Parser have been replaced with Vector or
Array to avoid memory leaks and OOBs.
This commit is contained in:
Zaggy1024 2022-10-08 21:54:20 -05:00 • committed by Andrew Kaster
parent da9ff31166
commit 1514004cd5
10 changed files with 1445 additions and 146 deletions
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145
Userland/Libraries/LibVideo/VP9/Parser.cpp
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@ -5,10 +5,13 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "Parser.h"
#include "Decoder.h"
#include "Utilities.h"
#include <AK/String.h>
#include <LibGfx/Point.h>
#include <LibGfx/Size.h>
#include "Decoder.h"
#include "Parser.h"
#include "Utilities.h"
namespace Video::VP9 {
@ -23,22 +26,22 @@ Parser::Parser(Decoder& decoder)
Parser::~Parser()
{
cleanup_tile_allocations();
free(m_prev_segment_ids);
}
void Parser::cleanup_tile_allocations()
{
free(m_skips);
free(m_tx_sizes);
free(m_mi_sizes);
free(m_y_modes);
free(m_segment_ids);
free(m_ref_frames);
free(m_interp_filters);
free(m_mvs);
free(m_sub_mvs);
free(m_sub_modes);
// FIXME: Is this necessary? Data should be truncated and
// overwritten by the next tile.
m_skips.clear_with_capacity();
m_tx_sizes.clear_with_capacity();
m_mi_sizes.clear_with_capacity();
m_y_modes.clear_with_capacity();
m_segment_ids.clear_with_capacity();
m_ref_frames.clear_with_capacity();
m_interp_filters.clear_with_capacity();
m_mvs.clear_with_capacity();
m_sub_mvs.clear_with_capacity();
m_sub_modes.clear_with_capacity();
}
/* (6.1) */
@ -63,6 +66,8 @@ DecoderErrorOr<void> Parser::parse_frame(ByteBuffer const& frame_data)
dbgln("Finished reading compressed header");
TRY_READ(m_bit_stream->exit_bool());
TRY(m_decoder.allocate_buffers());
TRY(decode_tiles());
TRY(refresh_probs());
@ -335,11 +340,11 @@ DecoderErrorOr<void> Parser::loop_filter_params()
DecoderErrorOr<void> Parser::quantization_params()
{
auto base_q_idx = TRY_READ(m_bit_stream->read_f8());
auto delta_q_y_dc = TRY(read_delta_q());
auto delta_q_uv_dc = TRY(read_delta_q());
auto delta_q_uv_ac = TRY(read_delta_q());
m_lossless = base_q_idx == 0 && delta_q_y_dc == 0 && delta_q_uv_dc == 0 && delta_q_uv_ac == 0;
m_base_q_idx = TRY_READ(m_bit_stream->read_f8());
m_delta_q_y_dc = TRY(read_delta_q());
m_delta_q_uv_dc = TRY(read_delta_q());
m_delta_q_uv_ac = TRY(read_delta_q());
m_lossless = m_base_q_idx == 0 && m_delta_q_y_dc == 0 && m_delta_q_uv_dc == 0 && m_delta_q_uv_ac == 0;
return {};
}
@ -441,9 +446,8 @@ void Parser::setup_past_independence()
}
}
m_segmentation_abs_or_delta_update = false;
if (m_prev_segment_ids)
free(m_prev_segment_ids);
m_prev_segment_ids = static_cast<u8*>(kmalloc_array(m_mi_rows, m_mi_cols));
m_prev_segment_ids.clear_with_capacity();
m_prev_segment_ids.resize_and_keep_capacity(m_mi_rows * m_mi_cols);
m_loop_filter_delta_enabled = true;
m_loop_filter_ref_deltas[IntraFrame] = 1;
m_loop_filter_ref_deltas[LastFrame] = 0;
@ -561,8 +565,8 @@ DecoderErrorOr<void> Parser::read_coef_probs()
auto max_l = (k == 0) ? 3 : 6;
for (auto l = 0; l < max_l; l++) {
for (auto m = 0; m < 3; m++) {
auto& coef_probs = m_probability_tables->coef_probs()[tx_size];
coef_probs[i][j][k][l][m] = TRY(diff_update_prob(coef_probs[i][j][k][l][m]));
auto& prob = m_probability_tables->coef_probs()[tx_size][i][j][k][l][m];
prob = TRY(diff_update_prob(prob));
}
}
}
@ -748,30 +752,28 @@ void Parser::setup_compound_reference_mode()
}
}
void Parser::allocate_tile_data()
DecoderErrorOr<void> Parser::allocate_tile_data()
{
auto dimensions = m_mi_rows * m_mi_cols;
if (dimensions == m_allocated_dimensions)
return;
cleanup_tile_allocations();
m_skips = static_cast<bool*>(kmalloc_array(dimensions, sizeof(bool)));
m_tx_sizes = static_cast<TXSize*>(kmalloc_array(dimensions, sizeof(TXSize)));
m_mi_sizes = static_cast<u32*>(kmalloc_array(dimensions, sizeof(u32)));
m_y_modes = static_cast<u8*>(kmalloc_array(dimensions, sizeof(u8)));
m_segment_ids = static_cast<u8*>(kmalloc_array(dimensions, sizeof(u8)));
m_ref_frames = static_cast<ReferenceFrame*>(kmalloc_array(dimensions, 2, sizeof(ReferenceFrame)));
m_interp_filters = static_cast<InterpolationFilter*>(kmalloc_array(dimensions, sizeof(InterpolationFilter)));
m_mvs = static_cast<MV*>(kmalloc_array(dimensions, 2, sizeof(MV)));
m_sub_mvs = static_cast<MV*>(kmalloc_array(dimensions, 8, sizeof(MV)));
m_sub_modes = static_cast<IntraMode*>(kmalloc_array(dimensions, 4, sizeof(IntraMode)));
m_allocated_dimensions = dimensions;
DECODER_TRY_ALLOC(m_skips.try_resize_and_keep_capacity(dimensions));
DECODER_TRY_ALLOC(m_tx_sizes.try_resize_and_keep_capacity(dimensions));
DECODER_TRY_ALLOC(m_mi_sizes.try_resize_and_keep_capacity(dimensions));
DECODER_TRY_ALLOC(m_y_modes.try_resize_and_keep_capacity(dimensions));
DECODER_TRY_ALLOC(m_segment_ids.try_resize_and_keep_capacity(dimensions));
DECODER_TRY_ALLOC(m_ref_frames.try_resize_and_keep_capacity(dimensions));
DECODER_TRY_ALLOC(m_interp_filters.try_resize_and_keep_capacity(dimensions));
DECODER_TRY_ALLOC(m_mvs.try_resize_and_keep_capacity(dimensions));
DECODER_TRY_ALLOC(m_sub_mvs.try_resize_and_keep_capacity(dimensions));
DECODER_TRY_ALLOC(m_sub_modes.try_resize_and_keep_capacity(dimensions));
return {};
}
DecoderErrorOr<void> Parser::decode_tiles()
{
auto tile_cols = 1 << m_tile_cols_log2;
auto tile_rows = 1 << m_tile_rows_log2;
allocate_tile_data();
TRY(allocate_tile_data());
clear_above_context();
for (auto tile_row = 0; tile_row < tile_rows; tile_row++) {
for (auto tile_col = 0; tile_col < tile_cols; tile_col++) {
@ -826,9 +828,7 @@ DecoderErrorOr<void> Parser::decode_tile()
{
for (auto row = m_mi_row_start; row < m_mi_row_end; row += 8) {
clear_left_context();
m_row = row;
for (auto col = m_mi_col_start; col < m_mi_col_end; col += 8) {
m_col = col;
TRY(decode_partition(row, col, Block_64x64));
}
}
@ -845,14 +845,16 @@ void Parser::clear_left_context()
DecoderErrorOr<void> Parser::decode_partition(u32 row, u32 col, u8 block_subsize)
{
if (row >= m_mi_rows || col >= m_mi_cols)
return DecoderError::corrupted("Row or column were outside valid ranges"sv);
return {};
m_block_subsize = block_subsize;
m_num_8x8 = num_8x8_blocks_wide_lookup[block_subsize];
auto half_block_8x8 = m_num_8x8 >> 1;
m_has_rows = (row + half_block_8x8) < m_mi_rows;
m_has_cols = (col + half_block_8x8) < m_mi_cols;
m_row = row;
m_col = col;
auto partition = TRY_READ(m_tree_parser->parse_tree(SyntaxElementType::Partition));
auto subsize = subsize_lookup[partition][block_subsize];
if (subsize < Block_8x8 || partition == PartitionNone) {
TRY(decode_block(row, col, subsize));
@ -871,15 +873,22 @@ DecoderErrorOr<void> Parser::decode_partition(u32 row, u32 col, u8 block_subsize
TRY(decode_partition(row + half_block_8x8, col + half_block_8x8, subsize));
}
if (block_subsize == Block_8x8 || partition != PartitionSplit) {
auto above_context = 15 >> b_width_log2_lookup[subsize];
auto left_context = 15 >> b_height_log2_lookup[subsize];
for (size_t i = 0; i < m_num_8x8; i++) {
m_above_partition_context[col + i] = 15 >> b_width_log2_lookup[subsize];
m_left_partition_context[row + i] = 15 >> b_width_log2_lookup[subsize];
m_above_partition_context[col + i] = above_context;
m_left_partition_context[row + i] = left_context;
}
}
return {};
}
DecoderErrorOr<void> Parser::decode_block(u32 row, u32 col, u8 subsize)
size_t Parser::get_image_index(u32 row, u32 column)
{
return row * m_mi_cols + column;
}
DecoderErrorOr<void> Parser::decode_block(u32 row, u32 col, BlockSubsize subsize)
{
m_mi_row = row;
m_mi_col = col;
@ -893,25 +902,24 @@ DecoderErrorOr<void> Parser::decode_block(u32 row, u32 col, u8 subsize)
m_skip = true;
for (size_t y = 0; y < num_8x8_blocks_high_lookup[subsize]; y++) {
for (size_t x = 0; x < num_8x8_blocks_wide_lookup[subsize]; x++) {
auto pos = (row + y) * m_mi_cols + (col + x);
auto pos = get_image_index(row + y, col + x);
m_skips[pos] = m_skip;
m_tx_sizes[pos] = m_tx_size;
m_mi_sizes[pos] = m_mi_size;
m_y_modes[pos] = m_y_mode;
m_segment_ids[pos] = m_segment_id;
for (size_t ref_list = 0; ref_list < 2; ref_list++)
m_ref_frames[(pos * 2) + ref_list] = m_ref_frame[ref_list];
m_ref_frames[pos][ref_list] = m_ref_frame[ref_list];
if (m_is_inter) {
m_interp_filters[pos] = m_interp_filter;
for (size_t ref_list = 0; ref_list < 2; ref_list++) {
auto pos_with_ref_list = (pos * 2 + ref_list) * sizeof(MV);
m_mvs[pos_with_ref_list] = m_block_mvs[ref_list][3];
m_mvs[pos][ref_list] = m_block_mvs[ref_list][3];
for (size_t b = 0; b < 4; b++)
m_sub_mvs[pos_with_ref_list * 4 + b * sizeof(MV)] = m_block_mvs[ref_list][b];
m_sub_mvs[pos][ref_list][b] = m_block_mvs[ref_list][b];
}
} else {
for (size_t b = 0; b < 4; b++)
m_sub_modes[pos * 4 + b] = static_cast<IntraMode>(m_block_sub_modes[b]);
m_sub_modes[pos][b] = static_cast<IntraMode>(m_block_sub_modes[b]);
}
}
}
@ -998,10 +1006,10 @@ DecoderErrorOr<void> Parser::read_tx_size(bool allow_select)
DecoderErrorOr<void> Parser::inter_frame_mode_info()
{
m_left_ref_frame[0] = m_available_l ? m_ref_frames[m_mi_row * m_mi_cols + (m_mi_col - 1)] : IntraFrame;
m_above_ref_frame[0] = m_available_u ? m_ref_frames[(m_mi_row - 1) * m_mi_cols + m_mi_col] : IntraFrame;
m_left_ref_frame[1] = m_available_l ? m_ref_frames[m_mi_row * m_mi_cols + (m_mi_col - 1) + 1] : None;
m_above_ref_frame[1] = m_available_u ? m_ref_frames[(m_mi_row - 1) * m_mi_cols + m_mi_col + 1] : None;
m_left_ref_frame[0] = m_available_l ? m_ref_frames[get_image_index(m_mi_row, m_mi_col - 1)][0] : IntraFrame;
m_above_ref_frame[0] = m_available_u ? m_ref_frames[get_image_index(m_mi_row - 1, m_mi_col)][0] : IntraFrame;
m_left_ref_frame[1] = m_available_l ? m_ref_frames[get_image_index(m_mi_row, m_mi_col - 1)][1] : None;
m_above_ref_frame[1] = m_available_u ? m_ref_frames[get_image_index(m_mi_row - 1, m_mi_col)][1] : None;
m_left_intra = m_left_ref_frame[0] <= IntraFrame;
m_above_intra = m_above_ref_frame[0] <= IntraFrame;
m_left_single = m_left_ref_frame[1] <= None;
@ -1234,10 +1242,23 @@ DecoderErrorOr<i32> Parser::read_mv_component(u8)
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)
{
if (plane == 0)
return { column * 8, row * 8 };
return { (column * 8) >> m_subsampling_x, (row * 8) >> m_subsampling_y };
}
Gfx::Size<size_t> Parser::get_decoded_size_for_plane(u8 plane)
{
auto point = get_decoded_point_for_plane(m_mi_cols, m_mi_rows, plane);
return { point.x(), point.y() };
}
DecoderErrorOr<void> Parser::residual()
{
auto block_size = m_mi_size < Block_8x8 ? Block_8x8 : static_cast<BlockSubsize>(m_mi_size);
for (size_t plane = 0; plane < 3; plane++) {
for (u8 plane = 0; plane < 3; plane++) {
auto tx_size = (plane > 0) ? get_uv_tx_size() : m_tx_size;
auto step = 1 << tx_size;
auto plane_size = get_plane_block_size(block_size, plane);
@ -1274,10 +1295,8 @@ DecoderErrorOr<void> Parser::residual()
TRY(m_decoder.reconstruct(plane, start_x, start_y, tx_size));
}
}
auto above_sub_context = m_above_nonzero_context[plane];
auto left_sub_context = m_left_nonzero_context[plane];
above_sub_context.resize_and_keep_capacity((start_x >> 2) + step);
left_sub_context.resize_and_keep_capacity((start_y >> 2) + step);
auto& above_sub_context = m_above_nonzero_context[plane];
auto& left_sub_context = m_left_nonzero_context[plane];
for (auto i = 0; i < step; i++) {
above_sub_context[(start_x >> 2) + i] = non_zero;
left_sub_context[(start_y >> 2) + i] = non_zero;
@ -1378,7 +1397,7 @@ DecoderErrorOr<i32> Parser::read_coef(Token token)
{
auto cat = extra_bits[token][0];
auto num_extra = extra_bits[token][1];
auto coef = extra_bits[token][2];
u32 coef = extra_bits[token][2];
if (token == DctValCat6) {
for (size_t e = 0; e < (u8)(m_bit_depth - 8); e++) {
auto high_bit = TRY_READ(m_bit_stream->read_bool(255));