| 1 | /* |
| 2 | * HEVC Supplementary Enhancement Information messages |
| 3 | * |
| 4 | * Copyright (C) 2012 - 2013 Guillaume Martres |
| 5 | * Copyright (C) 2012 - 2013 Gildas Cocherel |
| 6 | * Copyright (C) 2013 Vittorio Giovara |
| 7 | * |
| 8 | * This file is part of FFmpeg. |
| 9 | * |
| 10 | * FFmpeg is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU Lesser General Public |
| 12 | * License as published by the Free Software Foundation; either |
| 13 | * version 2.1 of the License, or (at your option) any later version. |
| 14 | * |
| 15 | * FFmpeg is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 18 | * Lesser General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU Lesser General Public |
| 21 | * License along with FFmpeg; if not, write to the Free Software |
| 22 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 23 | */ |
| 24 | |
| 25 | #include "golomb.h" |
| 26 | #include "hevc.h" |
| 27 | |
| 28 | static void decode_nal_sei_decoded_picture_hash(HEVCContext *s) |
| 29 | { |
| 30 | int cIdx, i; |
| 31 | uint8_t hash_type; |
| 32 | //uint16_t picture_crc; |
| 33 | //uint32_t picture_checksum; |
| 34 | GetBitContext *gb = &s->HEVClc->gb; |
| 35 | hash_type = get_bits(gb, 8); |
| 36 | |
| 37 | for (cIdx = 0; cIdx < 3/*((s->sps->chroma_format_idc == 0) ? 1 : 3)*/; cIdx++) { |
| 38 | if (hash_type == 0) { |
| 39 | s->is_md5 = 1; |
| 40 | for (i = 0; i < 16; i++) |
| 41 | s->md5[cIdx][i] = get_bits(gb, 8); |
| 42 | } else if (hash_type == 1) { |
| 43 | // picture_crc = get_bits(gb, 16); |
| 44 | skip_bits(gb, 16); |
| 45 | } else if (hash_type == 2) { |
| 46 | // picture_checksum = get_bits_long(gb, 32); |
| 47 | skip_bits(gb, 32); |
| 48 | } |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | static void decode_nal_sei_frame_packing_arrangement(HEVCContext *s) |
| 53 | { |
| 54 | GetBitContext *gb = &s->HEVClc->gb; |
| 55 | |
| 56 | get_ue_golomb(gb); // frame_packing_arrangement_id |
| 57 | s->sei_frame_packing_present = !get_bits1(gb); |
| 58 | |
| 59 | if (s->sei_frame_packing_present) { |
| 60 | s->frame_packing_arrangement_type = get_bits(gb, 7); |
| 61 | s->quincunx_subsampling = get_bits1(gb); |
| 62 | s->content_interpretation_type = get_bits(gb, 6); |
| 63 | |
| 64 | // the following skips spatial_flipping_flag frame0_flipped_flag |
| 65 | // field_views_flag current_frame_is_frame0_flag |
| 66 | // frame0_self_contained_flag frame1_self_contained_flag |
| 67 | skip_bits(gb, 6); |
| 68 | |
| 69 | if (!s->quincunx_subsampling && s->frame_packing_arrangement_type != 5) |
| 70 | skip_bits(gb, 16); // frame[01]_grid_position_[xy] |
| 71 | skip_bits(gb, 8); // frame_packing_arrangement_reserved_byte |
| 72 | skip_bits1(gb); // frame_packing_arrangement_persistance_flag |
| 73 | } |
| 74 | skip_bits1(gb); // upsampled_aspect_ratio_flag |
| 75 | } |
| 76 | |
| 77 | static void decode_nal_sei_display_orientation(HEVCContext *s) |
| 78 | { |
| 79 | GetBitContext *gb = &s->HEVClc->gb; |
| 80 | |
| 81 | s->sei_display_orientation_present = !get_bits1(gb); |
| 82 | |
| 83 | if (s->sei_display_orientation_present) { |
| 84 | s->sei_hflip = get_bits1(gb); // hor_flip |
| 85 | s->sei_vflip = get_bits1(gb); // ver_flip |
| 86 | |
| 87 | s->sei_anticlockwise_rotation = get_bits(gb, 16); |
| 88 | skip_bits1(gb); // display_orientation_persistence_flag |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | static int decode_pic_timing(HEVCContext *s) |
| 93 | { |
| 94 | GetBitContext *gb = &s->HEVClc->gb; |
| 95 | HEVCSPS *sps; |
| 96 | |
| 97 | if (!s->sps_list[s->active_seq_parameter_set_id]) |
| 98 | return(AVERROR(ENOMEM)); |
| 99 | sps = (HEVCSPS*)s->sps_list[s->active_seq_parameter_set_id]->data; |
| 100 | |
| 101 | if (sps->vui.frame_field_info_present_flag) { |
| 102 | int pic_struct = get_bits(gb, 4); |
| 103 | s->picture_struct = AV_PICTURE_STRUCTURE_UNKNOWN; |
| 104 | if (pic_struct == 2) { |
| 105 | av_log(s->avctx, AV_LOG_DEBUG, "BOTTOM Field\n"); |
| 106 | s->picture_struct = AV_PICTURE_STRUCTURE_BOTTOM_FIELD; |
| 107 | } else if (pic_struct == 1) { |
| 108 | av_log(s->avctx, AV_LOG_DEBUG, "TOP Field\n"); |
| 109 | s->picture_struct = AV_PICTURE_STRUCTURE_TOP_FIELD; |
| 110 | } |
| 111 | get_bits(gb, 2); // source_scan_type |
| 112 | get_bits(gb, 1); // duplicate_flag |
| 113 | } |
| 114 | return 1; |
| 115 | } |
| 116 | |
| 117 | static int active_parameter_sets(HEVCContext *s) |
| 118 | { |
| 119 | GetBitContext *gb = &s->HEVClc->gb; |
| 120 | int num_sps_ids_minus1; |
| 121 | int i; |
| 122 | unsigned active_seq_parameter_set_id; |
| 123 | |
| 124 | get_bits(gb, 4); // active_video_parameter_set_id |
| 125 | get_bits(gb, 1); // self_contained_cvs_flag |
| 126 | get_bits(gb, 1); // num_sps_ids_minus1 |
| 127 | num_sps_ids_minus1 = get_ue_golomb_long(gb); // num_sps_ids_minus1 |
| 128 | |
| 129 | active_seq_parameter_set_id = get_ue_golomb_long(gb); |
| 130 | if (active_seq_parameter_set_id >= MAX_SPS_COUNT) { |
| 131 | av_log(s->avctx, AV_LOG_ERROR, "active_parameter_set_id %d invalid\n", active_seq_parameter_set_id); |
| 132 | return AVERROR_INVALIDDATA; |
| 133 | } |
| 134 | s->active_seq_parameter_set_id = active_seq_parameter_set_id; |
| 135 | |
| 136 | for (i = 1; i <= num_sps_ids_minus1; i++) |
| 137 | get_ue_golomb_long(gb); // active_seq_parameter_set_id[i] |
| 138 | |
| 139 | return 0; |
| 140 | } |
| 141 | |
| 142 | static int decode_nal_sei_message(HEVCContext *s) |
| 143 | { |
| 144 | GetBitContext *gb = &s->HEVClc->gb; |
| 145 | |
| 146 | int payload_type = 0; |
| 147 | int payload_size = 0; |
| 148 | int byte = 0xFF; |
| 149 | av_log(s->avctx, AV_LOG_DEBUG, "Decoding SEI\n"); |
| 150 | |
| 151 | while (byte == 0xFF) { |
| 152 | byte = get_bits(gb, 8); |
| 153 | payload_type += byte; |
| 154 | } |
| 155 | byte = 0xFF; |
| 156 | while (byte == 0xFF) { |
| 157 | byte = get_bits(gb, 8); |
| 158 | payload_size += byte; |
| 159 | } |
| 160 | if (s->nal_unit_type == NAL_SEI_PREFIX) { |
| 161 | if (payload_type == 256 /*&& s->decode_checksum_sei*/) { |
| 162 | decode_nal_sei_decoded_picture_hash(s); |
| 163 | } else if (payload_type == 45) { |
| 164 | decode_nal_sei_frame_packing_arrangement(s); |
| 165 | } else if (payload_type == 47) { |
| 166 | decode_nal_sei_display_orientation(s); |
| 167 | } else if (payload_type == 1){ |
| 168 | int ret = decode_pic_timing(s); |
| 169 | av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type); |
| 170 | skip_bits(gb, 8 * payload_size); |
| 171 | return ret; |
| 172 | } else if (payload_type == 129){ |
| 173 | active_parameter_sets(s); |
| 174 | av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type); |
| 175 | } else { |
| 176 | av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type); |
| 177 | skip_bits(gb, 8*payload_size); |
| 178 | } |
| 179 | } else { /* nal_unit_type == NAL_SEI_SUFFIX */ |
| 180 | if (payload_type == 132 /* && s->decode_checksum_sei */) |
| 181 | decode_nal_sei_decoded_picture_hash(s); |
| 182 | else { |
| 183 | av_log(s->avctx, AV_LOG_DEBUG, "Skipped SUFFIX SEI %d\n", payload_type); |
| 184 | skip_bits(gb, 8 * payload_size); |
| 185 | } |
| 186 | } |
| 187 | return 1; |
| 188 | } |
| 189 | |
| 190 | static int more_rbsp_data(GetBitContext *gb) |
| 191 | { |
| 192 | return get_bits_left(gb) > 0 && show_bits(gb, 8) != 0x80; |
| 193 | } |
| 194 | |
| 195 | int ff_hevc_decode_nal_sei(HEVCContext *s) |
| 196 | { |
| 197 | int ret; |
| 198 | |
| 199 | do { |
| 200 | ret = decode_nal_sei_message(s); |
| 201 | if (ret < 0) |
| 202 | return(AVERROR(ENOMEM)); |
| 203 | } while (more_rbsp_data(&s->HEVClc->gb)); |
| 204 | return 1; |
| 205 | } |