av1_config.c | Explore in Territory

/*
 * 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 …

#define AV1C_READ_BITS_OR_RETURN_ERROR …

// Helper macros for setting/restoring the error handler data in
// aom_read_bit_buffer.
#define AV1C_PUSH_ERROR_HANDLER_DATA …

#define AV1C_POP_ERROR_HANDLER_DATA …

static const size_t kAv1cSize = …;

static void bitreader_error_handler(void *data) { … }

// 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) { … }

// 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) { … }

// 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) { … }

// 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) { … }

// 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 get_av1config_from_obu(const uint8_t *buffer, size_t length, int is_annexb,
                           Av1Config *config) { … }

int read_av1config(const uint8_t *buffer, size_t buffer_length,
                   size_t *bytes_read, Av1Config *config) { … }

int write_av1config(const Av1Config *config, size_t capacity,
                    size_t *bytes_written, uint8_t *buffer) { … }

#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
chromium/third_party/libaom/source/libaom/common/av1_config.c
