diff options
Diffstat (limited to 'media/libaom/src/common/av1_config.c')
| -rw-r--r-- | media/libaom/src/common/av1_config.c | 511 |
1 files changed, 511 insertions, 0 deletions
diff --git a/media/libaom/src/common/av1_config.c b/media/libaom/src/common/av1_config.c new file mode 100644 index 000000000..e8decf76f --- /dev/null +++ b/media/libaom/src/common/av1_config.c @@ -0,0 +1,511 @@ +/* + * 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 |