/* * 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