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gecko-dev/third_party/aom/common/av1_config.c

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/*
* Copyright (c) 2018, Alliance for Open Media. All rights reserved
*
* This source code is subject to the terms of the BSD 2 Clause License and
* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
* was not distributed with this source code in the LICENSE file, you can
* obtain it at www.aomedia.org/license/software. If the Alliance for Open
* Media Patent License 1.0 was not distributed with this source code in the
* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
*/
#include <stdio.h>
#include <string.h>
#include "aom/aom_image.h"
#include "aom/aom_integer.h"
#include "aom_dsp/bitreader_buffer.h"
#include "aom_dsp/bitwriter_buffer.h"
#include "av1/common/obu_util.h"
#include "common/av1_config.h"
#include "config/aom_config.h"
// Helper macros to reduce verbosity required to check for read errors.
//
// Note that when using these macros, even single line if statements should use
// curly braces to avoid unexpected behavior because all but the
// AV1C_POP_ERROR_HANDLER_DATA() macro consist of multiple statements.
#define AV1C_READ_BIT_OR_RETURN_ERROR(field) \
int field = 0; \
do { \
field = aom_rb_read_bit(reader); \
if (result == -1) { \
fprintf(stderr, \
"av1c: Error reading bit for " #field ", value=%d result=%d.\n", \
field, result); \
return -1; \
} \
} while (0)
#define AV1C_READ_BITS_OR_RETURN_ERROR(field, length) \
int field = 0; \
do { \
field = aom_rb_read_literal(reader, (length)); \
if (result == -1) { \
fprintf(stderr, \
"av1c: Could not read bits for " #field \
", value=%d result=%d.\n", \
field, result); \
return -1; \
} \
} while (0)
// Helper macros for setting/restoring the error handler data in
// aom_read_bit_buffer.
#define AV1C_PUSH_ERROR_HANDLER_DATA(new_data) \
void *original_error_handler_data = NULL; \
do { \
original_error_handler_data = reader->error_handler_data; \
reader->error_handler_data = &new_data; \
} while (0)
#define AV1C_POP_ERROR_HANDLER_DATA() \
do { \
reader->error_handler_data = original_error_handler_data; \
} while (0)
static const size_t kAv1cSize = 4;
static void bitreader_error_handler(void *data) {
int *error_val = (int *)data;
*error_val = -1;
}
// Parse the AV1 timing_info() structure:
// timing_info( ) {
// num_units_in_display_tick f(32)
// time_scale f(32)
// equal_picture_interval f(1)
// if (equal_picture_interval)
// num_ticks_per_picture_minus_1 uvlc()
// }
static int parse_timing_info(struct aom_read_bit_buffer *reader) {
int result = 0;
AV1C_PUSH_ERROR_HANDLER_DATA(result);
AV1C_READ_BITS_OR_RETURN_ERROR(num_units_in_display_tick, 32);
AV1C_READ_BITS_OR_RETURN_ERROR(time_scale, 32);
AV1C_READ_BIT_OR_RETURN_ERROR(equal_picture_interval);
if (equal_picture_interval) {
uint32_t num_ticks_per_picture_minus_1 = aom_rb_read_uvlc(reader);
if (result == -1) {
fprintf(stderr,
"av1c: Could not read bits for "
"num_ticks_per_picture_minus_1, value=%u.\n",
num_ticks_per_picture_minus_1);
return result;
}
}
AV1C_POP_ERROR_HANDLER_DATA();
return result;
}
// Parse the AV1 decoder_model_info() structure:
// decoder_model_info( ) {
// buffer_delay_length_minus_1 f(5)
// num_units_in_decoding_tick f(32)
// buffer_removal_time_length_minus_1 f(5)
// frame_presentation_time_length_minus_1 f(5)
// }
//
// Returns -1 upon failure, or the value of buffer_delay_length_minus_1 + 1.
static int parse_decoder_model_info(struct aom_read_bit_buffer *reader) {
int result = 0;
AV1C_PUSH_ERROR_HANDLER_DATA(result);
AV1C_READ_BITS_OR_RETURN_ERROR(buffer_delay_length_minus_1, 5);
AV1C_READ_BITS_OR_RETURN_ERROR(num_units_in_decoding_tick, 32);
AV1C_READ_BITS_OR_RETURN_ERROR(buffer_removal_time_length_minus_1, 5);
AV1C_READ_BITS_OR_RETURN_ERROR(frame_presentation_time_length_minus_1, 5);
AV1C_POP_ERROR_HANDLER_DATA();
return buffer_delay_length_minus_1 + 1;
}
// Parse the AV1 operating_parameters_info() structure:
// operating_parameters_info( op ) {
// n = buffer_delay_length_minus_1 + 1
// decoder_buffer_delay[ op ] f(n)
// encoder_buffer_delay[ op ] f(n)
// low_delay_mode_flag[ op ] f(1)
// }
static int parse_operating_parameters_info(struct aom_read_bit_buffer *reader,
int buffer_delay_length_minus_1) {
int result = 0;
AV1C_PUSH_ERROR_HANDLER_DATA(result);
const int buffer_delay_length = buffer_delay_length_minus_1 + 1;
AV1C_READ_BITS_OR_RETURN_ERROR(decoder_buffer_delay, buffer_delay_length);
AV1C_READ_BITS_OR_RETURN_ERROR(encoder_buffer_delay, buffer_delay_length);
AV1C_READ_BIT_OR_RETURN_ERROR(low_delay_mode_flag);
AV1C_POP_ERROR_HANDLER_DATA();
return result;
}
// Parse the AV1 color_config() structure..See:
// https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=44
static int parse_color_config(struct aom_read_bit_buffer *reader,
Av1Config *config) {
int result = 0;
AV1C_PUSH_ERROR_HANDLER_DATA(result);
AV1C_READ_BIT_OR_RETURN_ERROR(high_bitdepth);
config->high_bitdepth = high_bitdepth;
int bit_depth = 0;
if (config->seq_profile == 2 && config->high_bitdepth) {
AV1C_READ_BIT_OR_RETURN_ERROR(twelve_bit);
config->twelve_bit = twelve_bit;
bit_depth = config->twelve_bit ? 12 : 10;
} else {
bit_depth = config->high_bitdepth ? 10 : 8;
}
if (config->seq_profile != 1) {
AV1C_READ_BIT_OR_RETURN_ERROR(mono_chrome);
config->monochrome = mono_chrome;
}
int color_primaries = AOM_CICP_CP_UNSPECIFIED;
int transfer_characteristics = AOM_CICP_TC_UNSPECIFIED;
int matrix_coefficients = AOM_CICP_MC_UNSPECIFIED;
AV1C_READ_BIT_OR_RETURN_ERROR(color_description_present_flag);
if (color_description_present_flag) {
AV1C_READ_BITS_OR_RETURN_ERROR(color_primaries_val, 8);
color_primaries = color_primaries_val;
AV1C_READ_BITS_OR_RETURN_ERROR(transfer_characteristics_val, 8);
transfer_characteristics = transfer_characteristics_val;
AV1C_READ_BITS_OR_RETURN_ERROR(matrix_coefficients_val, 8);
matrix_coefficients = matrix_coefficients_val;
}
if (config->monochrome) {
AV1C_READ_BIT_OR_RETURN_ERROR(color_range);
config->chroma_subsampling_x = 1;
config->chroma_subsampling_y = 1;
} else if (color_primaries == AOM_CICP_CP_BT_709 &&
transfer_characteristics == AOM_CICP_TC_SRGB &&
matrix_coefficients == AOM_CICP_MC_IDENTITY) {
config->chroma_subsampling_x = 0;
config->chroma_subsampling_y = 0;
} else {
AV1C_READ_BIT_OR_RETURN_ERROR(color_range);
if (config->seq_profile == 0) {
config->chroma_subsampling_x = 1;
config->chroma_subsampling_y = 1;
} else if (config->seq_profile == 1) {
config->chroma_subsampling_x = 0;
config->chroma_subsampling_y = 0;
} else {
if (bit_depth == 12) {
AV1C_READ_BIT_OR_RETURN_ERROR(subsampling_x);
config->chroma_subsampling_x = subsampling_x;
if (subsampling_x) {
AV1C_READ_BIT_OR_RETURN_ERROR(subsampling_y);
config->chroma_subsampling_y = subsampling_y;
} else {
config->chroma_subsampling_y = 0;
}
} else {
config->chroma_subsampling_x = 1;
config->chroma_subsampling_y = 0;
}
}
if (config->chroma_subsampling_x && config->chroma_subsampling_y) {
AV1C_READ_BITS_OR_RETURN_ERROR(chroma_sample_position, 2);
config->chroma_sample_position = chroma_sample_position;
}
}
if (!config->monochrome) {
AV1C_READ_BIT_OR_RETURN_ERROR(separate_uv_delta_q);
}
AV1C_POP_ERROR_HANDLER_DATA();
return result;
}
// Parse AV1 Sequence Header OBU. See:
// https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41
static int parse_sequence_header(const uint8_t *const buffer, size_t length,
Av1Config *config) {
int result = 0;
// The reader instance is local to this function, but a pointer to the
// reader instance is used within this function and throughout this file to
// allow use of the helper macros that reduce parse error checking verbosity.
struct aom_read_bit_buffer reader_instance = {
buffer, buffer + length, 0, &result, bitreader_error_handler
};
struct aom_read_bit_buffer *reader = &reader_instance;
AV1C_READ_BITS_OR_RETURN_ERROR(seq_profile, 3);
config->seq_profile = seq_profile;
AV1C_READ_BIT_OR_RETURN_ERROR(still_picture);
AV1C_READ_BIT_OR_RETURN_ERROR(reduced_still_picture_header);
if (reduced_still_picture_header) {
config->initial_presentation_delay_present = 0;
AV1C_READ_BITS_OR_RETURN_ERROR(seq_level_idx_0, 5);
config->seq_level_idx_0 = seq_level_idx_0;
config->seq_tier_0 = 0;
} else {
int has_decoder_model = 0;
int buffer_delay_length = 0;
AV1C_READ_BIT_OR_RETURN_ERROR(timing_info_present_flag);
if (timing_info_present_flag) {
if (parse_timing_info(reader) != 0) return -1;
AV1C_READ_BIT_OR_RETURN_ERROR(decoder_model_info_present_flag);
if (decoder_model_info_present_flag &&
(buffer_delay_length = parse_decoder_model_info(reader)) == -1) {
return -1;
}
has_decoder_model = 1;
}
AV1C_READ_BIT_OR_RETURN_ERROR(initial_presentation_delay_present);
config->initial_presentation_delay_present =
initial_presentation_delay_present;
AV1C_READ_BITS_OR_RETURN_ERROR(operating_points_cnt_minus_1, 5);
const int num_operating_points = operating_points_cnt_minus_1 + 1;
for (int op_index = 0; op_index < num_operating_points; ++op_index) {
AV1C_READ_BITS_OR_RETURN_ERROR(operating_point_idc, 12);
AV1C_READ_BITS_OR_RETURN_ERROR(seq_level_idx, 5);
int seq_tier = 0;
if (seq_level_idx > 7) {
AV1C_READ_BIT_OR_RETURN_ERROR(seq_tier_this_op);
seq_tier = seq_tier_this_op;
}
if (has_decoder_model) {
AV1C_READ_BIT_OR_RETURN_ERROR(decoder_model_present_for_op);
if (decoder_model_present_for_op) {
if (parse_operating_parameters_info(reader, buffer_delay_length) ==
-1) {
return -1;
}
}
}
if (config->initial_presentation_delay_present) {
// Skip the initial presentation delay bits if present since this
// function has no access to the data required to properly set the
// field.
AV1C_READ_BIT_OR_RETURN_ERROR(
initial_presentation_delay_present_for_this_op);
if (initial_presentation_delay_present_for_this_op) {
AV1C_READ_BITS_OR_RETURN_ERROR(initial_presentation_delay_minus_1, 4);
}
}
if (op_index == 0) {
// Av1Config needs only the values from the first operating point.
config->seq_level_idx_0 = seq_level_idx;
config->seq_tier_0 = seq_tier;
config->initial_presentation_delay_present = 0;
config->initial_presentation_delay_minus_one = 0;
}
}
}
AV1C_READ_BITS_OR_RETURN_ERROR(frame_width_bits_minus_1, 4);
AV1C_READ_BITS_OR_RETURN_ERROR(frame_height_bits_minus_1, 4);
AV1C_READ_BITS_OR_RETURN_ERROR(max_frame_width_minus_1,
frame_width_bits_minus_1 + 1);
AV1C_READ_BITS_OR_RETURN_ERROR(max_frame_height_minus_1,
frame_height_bits_minus_1 + 1);
int frame_id_numbers_present = 0;
if (!reduced_still_picture_header) {
AV1C_READ_BIT_OR_RETURN_ERROR(frame_id_numbers_present_flag);
frame_id_numbers_present = frame_id_numbers_present_flag;
}
if (frame_id_numbers_present) {
AV1C_READ_BITS_OR_RETURN_ERROR(delta_frame_id_length_minus_2, 4);
AV1C_READ_BITS_OR_RETURN_ERROR(additional_frame_id_length_minus_1, 3);
}
AV1C_READ_BIT_OR_RETURN_ERROR(use_128x128_superblock);
AV1C_READ_BIT_OR_RETURN_ERROR(enable_filter_intra);
AV1C_READ_BIT_OR_RETURN_ERROR(enable_intra_edge_filter);
if (!reduced_still_picture_header) {
AV1C_READ_BIT_OR_RETURN_ERROR(enable_interintra_compound);
AV1C_READ_BIT_OR_RETURN_ERROR(enable_masked_compound);
AV1C_READ_BIT_OR_RETURN_ERROR(enable_warped_motion);
AV1C_READ_BIT_OR_RETURN_ERROR(enable_dual_filter);
AV1C_READ_BIT_OR_RETURN_ERROR(enable_order_hint);
if (enable_order_hint) {
AV1C_READ_BIT_OR_RETURN_ERROR(enable_jnt_comp);
AV1C_READ_BIT_OR_RETURN_ERROR(enable_ref_frame_mvs);
}
const int SELECT_SCREEN_CONTENT_TOOLS = 2;
int seq_force_screen_content_tools = SELECT_SCREEN_CONTENT_TOOLS;
AV1C_READ_BIT_OR_RETURN_ERROR(seq_choose_screen_content_tools);
if (!seq_choose_screen_content_tools) {
AV1C_READ_BIT_OR_RETURN_ERROR(seq_force_screen_content_tools_val);
seq_force_screen_content_tools = seq_force_screen_content_tools_val;
}
if (seq_force_screen_content_tools > 0) {
AV1C_READ_BIT_OR_RETURN_ERROR(seq_choose_integer_mv);
if (!seq_choose_integer_mv) {
AV1C_READ_BIT_OR_RETURN_ERROR(seq_force_integer_mv);
}
}
if (enable_order_hint) {
AV1C_READ_BITS_OR_RETURN_ERROR(order_hint_bits_minus_1, 3);
}
}
AV1C_READ_BIT_OR_RETURN_ERROR(enable_superres);
AV1C_READ_BIT_OR_RETURN_ERROR(enable_cdef);
AV1C_READ_BIT_OR_RETURN_ERROR(enable_restoration);
if (parse_color_config(reader, config) != 0) {
fprintf(stderr, "av1c: color_config() parse failed.\n");
return -1;
}
AV1C_READ_BIT_OR_RETURN_ERROR(film_grain_params_present);
return 0;
}
int get_av1config_from_obu(const uint8_t *buffer, size_t length, int is_annexb,
Av1Config *config) {
if (!buffer || length == 0 || !config) {
return -1;
}
ObuHeader obu_header;
memset(&obu_header, 0, sizeof(obu_header));
size_t sequence_header_length = 0;
size_t obu_header_length = 0;
if (aom_read_obu_header_and_size(buffer, length, is_annexb, &obu_header,
&sequence_header_length,
&obu_header_length) != AOM_CODEC_OK ||
obu_header.type != OBU_SEQUENCE_HEADER ||
sequence_header_length + obu_header_length > length) {
return -1;
}
memset(config, 0, sizeof(*config));
config->marker = 1;
config->version = 1;
return parse_sequence_header(buffer + obu_header_length,
sequence_header_length, config);
}
int read_av1config(const uint8_t *buffer, size_t buffer_length,
size_t *bytes_read, Av1Config *config) {
if (!buffer || buffer_length < kAv1cSize || !bytes_read || !config) return -1;
*bytes_read = 0;
int result = 0;
struct aom_read_bit_buffer reader_instance = {
buffer, buffer + buffer_length, 0, &result, bitreader_error_handler
};
struct aom_read_bit_buffer *reader = &reader_instance;
memset(config, 0, sizeof(*config));
AV1C_READ_BIT_OR_RETURN_ERROR(marker);
config->marker = marker;
AV1C_READ_BITS_OR_RETURN_ERROR(version, 7);
config->version = version;
AV1C_READ_BITS_OR_RETURN_ERROR(seq_profile, 3);
config->seq_profile = seq_profile;
AV1C_READ_BITS_OR_RETURN_ERROR(seq_level_idx_0, 5);
config->seq_level_idx_0 = seq_level_idx_0;
AV1C_READ_BIT_OR_RETURN_ERROR(seq_tier_0);
config->seq_tier_0 = seq_tier_0;
AV1C_READ_BIT_OR_RETURN_ERROR(high_bitdepth);
config->high_bitdepth = high_bitdepth;
AV1C_READ_BIT_OR_RETURN_ERROR(twelve_bit);
config->twelve_bit = twelve_bit;
AV1C_READ_BIT_OR_RETURN_ERROR(monochrome);
config->monochrome = monochrome;
AV1C_READ_BIT_OR_RETURN_ERROR(chroma_subsampling_x);
config->chroma_subsampling_x = chroma_subsampling_x;
AV1C_READ_BIT_OR_RETURN_ERROR(chroma_subsampling_y);
config->chroma_subsampling_y = chroma_subsampling_y;
AV1C_READ_BITS_OR_RETURN_ERROR(chroma_sample_position, 2);
config->chroma_sample_position = chroma_sample_position;
AV1C_READ_BITS_OR_RETURN_ERROR(reserved, 3);
AV1C_READ_BIT_OR_RETURN_ERROR(initial_presentation_delay_present);
config->initial_presentation_delay_present =
initial_presentation_delay_present;
AV1C_READ_BITS_OR_RETURN_ERROR(initial_presentation_delay_minus_one, 4);
config->initial_presentation_delay_minus_one =
initial_presentation_delay_minus_one;
*bytes_read = aom_rb_bytes_read(reader);
return 0;
}
int write_av1config(const Av1Config *config, size_t capacity,
size_t *bytes_written, uint8_t *buffer) {
if (!config || !buffer || capacity < kAv1cSize || !bytes_written) return -1;
*bytes_written = 0;
memset(buffer, 0, kAv1cSize);
struct aom_write_bit_buffer writer = { buffer, 0 };
aom_wb_write_bit(&writer, config->marker);
aom_wb_write_literal(&writer, config->version, 7);
aom_wb_write_literal(&writer, config->seq_profile, 3);
aom_wb_write_literal(&writer, config->seq_level_idx_0, 5);
aom_wb_write_bit(&writer, config->seq_tier_0);
aom_wb_write_bit(&writer, config->high_bitdepth);
aom_wb_write_bit(&writer, config->twelve_bit);
aom_wb_write_bit(&writer, config->monochrome);
aom_wb_write_bit(&writer, config->chroma_subsampling_x);
aom_wb_write_bit(&writer, config->chroma_subsampling_y);
aom_wb_write_literal(&writer, config->chroma_sample_position, 2);
aom_wb_write_literal(&writer, 0, 3); // reserved
aom_wb_write_bit(&writer, config->initial_presentation_delay_present);
if (config->initial_presentation_delay_present) {
aom_wb_write_literal(&writer, config->initial_presentation_delay_minus_one,
4);
} else {
aom_wb_write_literal(&writer, 0, 4); // reserved
}
*bytes_written = aom_wb_bytes_written(&writer);
return 0;
}
#undef AV1C_READ_BIT_OR_RETURN_ERROR
#undef AV1C_READ_BITS_OR_RETURN_ERROR
#undef AV1C_PUSH_ERROR_HANDLER_DATA
#undef AV1C_POP_ERROR_HANDLER_DATA
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