| /* |
| * AV1 helper functions for muxers |
| * Copyright (c) 2018 James Almer <jamrial@gmail.com> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "libavutil/mem.h" |
| #include "libavcodec/av1.h" |
| #include "libavcodec/av1_parse.h" |
| #include "libavcodec/profiles.h" |
| #include "libavcodec/put_bits.h" |
| #include "av1.h" |
| #include "avio.h" |
| |
| int ff_av1_filter_obus(AVIOContext *pb, const uint8_t *buf, int size) |
| { |
| const uint8_t *end = buf + size; |
| int64_t obu_size; |
| int start_pos, type, temporal_id, spatial_id; |
| |
| size = 0; |
| while (buf < end) { |
| int len = parse_obu_header(buf, end - buf, &obu_size, &start_pos, |
| &type, &temporal_id, &spatial_id); |
| if (len < 0) |
| return len; |
| |
| switch (type) { |
| case AV1_OBU_TEMPORAL_DELIMITER: |
| case AV1_OBU_REDUNDANT_FRAME_HEADER: |
| case AV1_OBU_TILE_LIST: |
| case AV1_OBU_PADDING: |
| break; |
| default: |
| avio_write(pb, buf, len); |
| size += len; |
| break; |
| } |
| buf += len; |
| } |
| |
| return size; |
| } |
| |
| int ff_av1_filter_obus_buf(const uint8_t *buf, uint8_t **out, int *size) |
| { |
| AVIOContext *pb; |
| int ret; |
| |
| ret = avio_open_dyn_buf(&pb); |
| if (ret < 0) |
| return ret; |
| |
| ret = ff_av1_filter_obus(pb, buf, *size); |
| if (ret < 0) |
| return ret; |
| |
| av_freep(out); |
| *size = avio_close_dyn_buf(pb, out); |
| |
| return ret; |
| } |
| |
| static inline void uvlc(GetBitContext *gb) |
| { |
| int leading_zeros = 0; |
| |
| while (get_bits_left(gb)) { |
| if (get_bits1(gb)) |
| break; |
| leading_zeros++; |
| } |
| |
| if (leading_zeros >= 32) |
| return; |
| |
| skip_bits_long(gb, leading_zeros); |
| } |
| |
| static int parse_color_config(AV1SequenceParameters *seq_params, GetBitContext *gb) |
| { |
| int twelve_bit = 0; |
| int high_bitdepth = get_bits1(gb); |
| if (seq_params->profile == FF_PROFILE_AV1_PROFESSIONAL && high_bitdepth) |
| twelve_bit = get_bits1(gb); |
| |
| seq_params->bitdepth = 8 + (high_bitdepth * 2) + (twelve_bit * 2); |
| |
| if (seq_params->profile == FF_PROFILE_AV1_HIGH) |
| seq_params->monochrome = 0; |
| else |
| seq_params->monochrome = get_bits1(gb); |
| |
| seq_params->color_description_present_flag = get_bits1(gb); |
| if (seq_params->color_description_present_flag) { |
| seq_params->color_primaries = get_bits(gb, 8); |
| seq_params->transfer_characteristics = get_bits(gb, 8); |
| seq_params->matrix_coefficients = get_bits(gb, 8); |
| } else { |
| seq_params->color_primaries = AVCOL_PRI_UNSPECIFIED; |
| seq_params->transfer_characteristics = AVCOL_TRC_UNSPECIFIED; |
| seq_params->matrix_coefficients = AVCOL_SPC_UNSPECIFIED; |
| } |
| |
| if (seq_params->monochrome) { |
| seq_params->color_range = get_bits1(gb); |
| seq_params->chroma_subsampling_x = 1; |
| seq_params->chroma_subsampling_y = 1; |
| seq_params->chroma_sample_position = 0; |
| return 0; |
| } else if (seq_params->color_primaries == AVCOL_PRI_BT709 && |
| seq_params->transfer_characteristics == AVCOL_TRC_IEC61966_2_1 && |
| seq_params->matrix_coefficients == AVCOL_SPC_RGB) { |
| seq_params->chroma_subsampling_x = 0; |
| seq_params->chroma_subsampling_y = 0; |
| } else { |
| seq_params->color_range = get_bits1(gb); |
| |
| if (seq_params->profile == FF_PROFILE_AV1_MAIN) { |
| seq_params->chroma_subsampling_x = 1; |
| seq_params->chroma_subsampling_y = 1; |
| } else if (seq_params->profile == FF_PROFILE_AV1_HIGH) { |
| seq_params->chroma_subsampling_x = 0; |
| seq_params->chroma_subsampling_y = 0; |
| } else { |
| if (twelve_bit) { |
| seq_params->chroma_subsampling_x = get_bits1(gb); |
| if (seq_params->chroma_subsampling_x) |
| seq_params->chroma_subsampling_y = get_bits1(gb); |
| else |
| seq_params->chroma_subsampling_y = 0; |
| } else { |
| seq_params->chroma_subsampling_x = 1; |
| seq_params->chroma_subsampling_y = 0; |
| } |
| } |
| if (seq_params->chroma_subsampling_x && seq_params->chroma_subsampling_y) |
| seq_params->chroma_sample_position = get_bits(gb, 2); |
| } |
| |
| skip_bits1(gb); // separate_uv_delta_q |
| |
| return 0; |
| } |
| |
| static int parse_sequence_header(AV1SequenceParameters *seq_params, const uint8_t *buf, int size) |
| { |
| GetBitContext gb; |
| int reduced_still_picture_header; |
| int frame_width_bits_minus_1, frame_height_bits_minus_1; |
| int size_bits, ret; |
| |
| size_bits = get_obu_bit_length(buf, size, AV1_OBU_SEQUENCE_HEADER); |
| if (size_bits < 0) |
| return size_bits; |
| |
| ret = init_get_bits(&gb, buf, size_bits); |
| if (ret < 0) |
| return ret; |
| |
| memset(seq_params, 0, sizeof(*seq_params)); |
| |
| seq_params->profile = get_bits(&gb, 3); |
| |
| skip_bits1(&gb); // still_picture |
| reduced_still_picture_header = get_bits1(&gb); |
| |
| if (reduced_still_picture_header) { |
| seq_params->level = get_bits(&gb, 5); |
| seq_params->tier = 0; |
| } else { |
| int initial_display_delay_present_flag, operating_points_cnt_minus_1; |
| int decoder_model_info_present_flag, buffer_delay_length_minus_1; |
| |
| if (get_bits1(&gb)) { // timing_info_present_flag |
| skip_bits_long(&gb, 32); // num_units_in_display_tick |
| skip_bits_long(&gb, 32); // time_scale |
| |
| if (get_bits1(&gb)) // equal_picture_interval |
| uvlc(&gb); // num_ticks_per_picture_minus_1 |
| |
| decoder_model_info_present_flag = get_bits1(&gb); |
| if (decoder_model_info_present_flag) { |
| buffer_delay_length_minus_1 = get_bits(&gb, 5); |
| skip_bits_long(&gb, 32); // num_units_in_decoding_tick |
| skip_bits(&gb, 10); // buffer_removal_time_length_minus_1 (5) |
| // frame_presentation_time_length_minus_1 (5) |
| } |
| } else |
| decoder_model_info_present_flag = 0; |
| |
| initial_display_delay_present_flag = get_bits1(&gb); |
| |
| operating_points_cnt_minus_1 = get_bits(&gb, 5); |
| for (int i = 0; i <= operating_points_cnt_minus_1; i++) { |
| int seq_level_idx, seq_tier; |
| |
| skip_bits(&gb, 12); // operating_point_idc |
| seq_level_idx = get_bits(&gb, 5); |
| |
| if (seq_level_idx > 7) |
| seq_tier = get_bits1(&gb); |
| else |
| seq_tier = 0; |
| |
| if (decoder_model_info_present_flag) { |
| if (get_bits1(&gb)) { // decoder_model_present_for_this_op |
| skip_bits_long(&gb, buffer_delay_length_minus_1 + 1); // decoder_buffer_delay |
| skip_bits_long(&gb, buffer_delay_length_minus_1 + 1); // encoder_buffer_delay |
| skip_bits1(&gb); // low_delay_mode_flag |
| } |
| } |
| |
| if (initial_display_delay_present_flag) { |
| if (get_bits1(&gb)) // initial_display_delay_present_for_this_op |
| skip_bits(&gb, 4); // initial_display_delay_minus_1 |
| } |
| |
| if (i == 0) { |
| seq_params->level = seq_level_idx; |
| seq_params->tier = seq_tier; |
| } |
| } |
| } |
| |
| frame_width_bits_minus_1 = get_bits(&gb, 4); |
| frame_height_bits_minus_1 = get_bits(&gb, 4); |
| |
| skip_bits(&gb, frame_width_bits_minus_1 + 1); // max_frame_width_minus_1 |
| skip_bits(&gb, frame_height_bits_minus_1 + 1); // max_frame_height_minus_1 |
| |
| if (!reduced_still_picture_header) { |
| if (get_bits1(&gb)) // frame_id_numbers_present_flag |
| skip_bits(&gb, 7); // delta_frame_id_length_minus_2 (4), additional_frame_id_length_minus_1 (3) |
| } |
| |
| skip_bits(&gb, 3); // use_128x128_superblock (1), enable_filter_intra (1), enable_intra_edge_filter (1) |
| |
| if (!reduced_still_picture_header) { |
| int enable_order_hint, seq_force_screen_content_tools; |
| |
| skip_bits(&gb, 4); // enable_intraintra_compound (1), enable_masked_compound (1) |
| // enable_warped_motion (1), enable_dual_filter (1) |
| |
| enable_order_hint = get_bits1(&gb); |
| if (enable_order_hint) |
| skip_bits(&gb, 2); // enable_jnt_comp (1), enable_ref_frame_mvs (1) |
| |
| if (get_bits1(&gb)) // seq_choose_screen_content_tools |
| seq_force_screen_content_tools = 2; |
| else |
| seq_force_screen_content_tools = get_bits1(&gb); |
| |
| if (seq_force_screen_content_tools) { |
| if (!get_bits1(&gb)) // seq_choose_integer_mv |
| skip_bits1(&gb); // seq_force_integer_mv |
| } |
| |
| if (enable_order_hint) |
| skip_bits(&gb, 3); // order_hint_bits_minus_1 |
| } |
| |
| skip_bits(&gb, 3); // enable_superres (1), enable_cdef (1), enable_restoration (1) |
| |
| parse_color_config(seq_params, &gb); |
| |
| skip_bits1(&gb); // film_grain_params_present |
| |
| if (get_bits_left(&gb)) |
| return AVERROR_INVALIDDATA; |
| |
| return 0; |
| } |
| |
| int ff_av1_parse_seq_header(AV1SequenceParameters *seq, const uint8_t *buf, int size) |
| { |
| int64_t obu_size; |
| int start_pos, type, temporal_id, spatial_id; |
| |
| if (size <= 0) |
| return AVERROR_INVALIDDATA; |
| |
| while (size > 0) { |
| int len = parse_obu_header(buf, size, &obu_size, &start_pos, |
| &type, &temporal_id, &spatial_id); |
| if (len < 0) |
| return len; |
| |
| switch (type) { |
| case AV1_OBU_SEQUENCE_HEADER: |
| if (!obu_size) |
| return AVERROR_INVALIDDATA; |
| |
| return parse_sequence_header(seq, buf + start_pos, obu_size); |
| default: |
| break; |
| } |
| size -= len; |
| buf += len; |
| } |
| |
| return AVERROR_INVALIDDATA; |
| } |
| |
| int ff_isom_write_av1c(AVIOContext *pb, const uint8_t *buf, int size) |
| { |
| AVIOContext *seq_pb = NULL, *meta_pb = NULL; |
| AV1SequenceParameters seq_params; |
| PutBitContext pbc; |
| uint8_t header[4]; |
| uint8_t *seq = NULL, *meta = NULL; |
| int64_t obu_size; |
| int start_pos, type, temporal_id, spatial_id; |
| int ret, nb_seq = 0, seq_size, meta_size; |
| |
| if (size <= 0) |
| return AVERROR_INVALIDDATA; |
| |
| ret = avio_open_dyn_buf(&seq_pb); |
| if (ret < 0) |
| return ret; |
| ret = avio_open_dyn_buf(&meta_pb); |
| if (ret < 0) |
| goto fail; |
| |
| while (size > 0) { |
| int len = parse_obu_header(buf, size, &obu_size, &start_pos, |
| &type, &temporal_id, &spatial_id); |
| if (len < 0) { |
| ret = len; |
| goto fail; |
| } |
| |
| switch (type) { |
| case AV1_OBU_SEQUENCE_HEADER: |
| nb_seq++; |
| if (!obu_size || nb_seq > 1) { |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| ret = parse_sequence_header(&seq_params, buf + start_pos, obu_size); |
| if (ret < 0) |
| goto fail; |
| |
| avio_write(seq_pb, buf, len); |
| break; |
| case AV1_OBU_METADATA: |
| if (!obu_size) { |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| avio_write(meta_pb, buf, len); |
| break; |
| default: |
| break; |
| } |
| size -= len; |
| buf += len; |
| } |
| |
| seq_size = avio_close_dyn_buf(seq_pb, &seq); |
| if (!seq_size) { |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| |
| init_put_bits(&pbc, header, sizeof(header)); |
| |
| put_bits(&pbc, 1, 1); // marker |
| put_bits(&pbc, 7, 1); // version |
| put_bits(&pbc, 3, seq_params.profile); |
| put_bits(&pbc, 5, seq_params.level); |
| put_bits(&pbc, 1, seq_params.tier); |
| put_bits(&pbc, 1, seq_params.bitdepth > 8); |
| put_bits(&pbc, 1, seq_params.bitdepth == 12); |
| put_bits(&pbc, 1, seq_params.monochrome); |
| put_bits(&pbc, 1, seq_params.chroma_subsampling_x); |
| put_bits(&pbc, 1, seq_params.chroma_subsampling_y); |
| put_bits(&pbc, 2, seq_params.chroma_sample_position); |
| put_bits(&pbc, 8, 0); // padding |
| flush_put_bits(&pbc); |
| |
| avio_write(pb, header, sizeof(header)); |
| avio_write(pb, seq, seq_size); |
| |
| meta_size = avio_close_dyn_buf(meta_pb, &meta); |
| if (meta_size) |
| avio_write(pb, meta, meta_size); |
| |
| fail: |
| if (!seq) |
| avio_close_dyn_buf(seq_pb, &seq); |
| if (!meta) |
| avio_close_dyn_buf(meta_pb, &meta); |
| av_free(seq); |
| av_free(meta); |
| |
| return ret; |
| } |
