| /* |
| * HEVC Supplementary Enhancement Information messages |
| * |
| * Copyright (C) 2012 - 2013 Guillaume Martres |
| * Copyright (C) 2012 - 2013 Gildas Cocherel |
| * Copyright (C) 2013 Vittorio Giovara |
| * |
| * 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 "golomb.h" |
| #include "hevc.h" |
| |
| static void decode_nal_sei_decoded_picture_hash(HEVCContext *s) |
| { |
| int cIdx, i; |
| uint8_t hash_type; |
| //uint16_t picture_crc; |
| //uint32_t picture_checksum; |
| GetBitContext *gb = &s->HEVClc->gb; |
| hash_type = get_bits(gb, 8); |
| |
| for (cIdx = 0; cIdx < 3/*((s->sps->chroma_format_idc == 0) ? 1 : 3)*/; cIdx++) { |
| if (hash_type == 0) { |
| s->is_md5 = 1; |
| for (i = 0; i < 16; i++) |
| s->md5[cIdx][i] = get_bits(gb, 8); |
| } else if (hash_type == 1) { |
| // picture_crc = get_bits(gb, 16); |
| skip_bits(gb, 16); |
| } else if (hash_type == 2) { |
| // picture_checksum = get_bits_long(gb, 32); |
| skip_bits(gb, 32); |
| } |
| } |
| } |
| |
| static void decode_nal_sei_frame_packing_arrangement(HEVCContext *s) |
| { |
| GetBitContext *gb = &s->HEVClc->gb; |
| |
| get_ue_golomb(gb); // frame_packing_arrangement_id |
| s->sei_frame_packing_present = !get_bits1(gb); |
| |
| if (s->sei_frame_packing_present) { |
| s->frame_packing_arrangement_type = get_bits(gb, 7); |
| s->quincunx_subsampling = get_bits1(gb); |
| s->content_interpretation_type = get_bits(gb, 6); |
| |
| // the following skips spatial_flipping_flag frame0_flipped_flag |
| // field_views_flag current_frame_is_frame0_flag |
| // frame0_self_contained_flag frame1_self_contained_flag |
| skip_bits(gb, 6); |
| |
| if (!s->quincunx_subsampling && s->frame_packing_arrangement_type != 5) |
| skip_bits(gb, 16); // frame[01]_grid_position_[xy] |
| skip_bits(gb, 8); // frame_packing_arrangement_reserved_byte |
| skip_bits1(gb); // frame_packing_arrangement_persistance_flag |
| } |
| skip_bits1(gb); // upsampled_aspect_ratio_flag |
| } |
| |
| static void decode_nal_sei_display_orientation(HEVCContext *s) |
| { |
| GetBitContext *gb = &s->HEVClc->gb; |
| |
| s->sei_display_orientation_present = !get_bits1(gb); |
| |
| if (s->sei_display_orientation_present) { |
| s->sei_hflip = get_bits1(gb); // hor_flip |
| s->sei_vflip = get_bits1(gb); // ver_flip |
| |
| s->sei_anticlockwise_rotation = get_bits(gb, 16); |
| skip_bits1(gb); // display_orientation_persistence_flag |
| } |
| } |
| |
| static int decode_pic_timing(HEVCContext *s) |
| { |
| GetBitContext *gb = &s->HEVClc->gb; |
| HEVCSPS *sps; |
| |
| if (!s->sps_list[s->active_seq_parameter_set_id]) |
| return(AVERROR(ENOMEM)); |
| sps = (HEVCSPS*)s->sps_list[s->active_seq_parameter_set_id]->data; |
| |
| if (sps->vui.frame_field_info_present_flag) { |
| int pic_struct = get_bits(gb, 4); |
| s->picture_struct = AV_PICTURE_STRUCTURE_UNKNOWN; |
| if (pic_struct == 2) { |
| av_log(s->avctx, AV_LOG_DEBUG, "BOTTOM Field\n"); |
| s->picture_struct = AV_PICTURE_STRUCTURE_BOTTOM_FIELD; |
| } else if (pic_struct == 1) { |
| av_log(s->avctx, AV_LOG_DEBUG, "TOP Field\n"); |
| s->picture_struct = AV_PICTURE_STRUCTURE_TOP_FIELD; |
| } |
| get_bits(gb, 2); // source_scan_type |
| get_bits(gb, 1); // duplicate_flag |
| } |
| return 1; |
| } |
| |
| static int active_parameter_sets(HEVCContext *s) |
| { |
| GetBitContext *gb = &s->HEVClc->gb; |
| int num_sps_ids_minus1; |
| int i; |
| unsigned active_seq_parameter_set_id; |
| |
| get_bits(gb, 4); // active_video_parameter_set_id |
| get_bits(gb, 1); // self_contained_cvs_flag |
| get_bits(gb, 1); // num_sps_ids_minus1 |
| num_sps_ids_minus1 = get_ue_golomb_long(gb); // num_sps_ids_minus1 |
| |
| active_seq_parameter_set_id = get_ue_golomb_long(gb); |
| if (active_seq_parameter_set_id >= MAX_SPS_COUNT) { |
| av_log(s->avctx, AV_LOG_ERROR, "active_parameter_set_id %d invalid\n", active_seq_parameter_set_id); |
| return AVERROR_INVALIDDATA; |
| } |
| s->active_seq_parameter_set_id = active_seq_parameter_set_id; |
| |
| for (i = 1; i <= num_sps_ids_minus1; i++) |
| get_ue_golomb_long(gb); // active_seq_parameter_set_id[i] |
| |
| return 0; |
| } |
| |
| static int decode_nal_sei_message(HEVCContext *s) |
| { |
| GetBitContext *gb = &s->HEVClc->gb; |
| |
| int payload_type = 0; |
| int payload_size = 0; |
| int byte = 0xFF; |
| av_log(s->avctx, AV_LOG_DEBUG, "Decoding SEI\n"); |
| |
| while (byte == 0xFF) { |
| byte = get_bits(gb, 8); |
| payload_type += byte; |
| } |
| byte = 0xFF; |
| while (byte == 0xFF) { |
| byte = get_bits(gb, 8); |
| payload_size += byte; |
| } |
| if (s->nal_unit_type == NAL_SEI_PREFIX) { |
| if (payload_type == 256 /*&& s->decode_checksum_sei*/) { |
| decode_nal_sei_decoded_picture_hash(s); |
| } else if (payload_type == 45) { |
| decode_nal_sei_frame_packing_arrangement(s); |
| } else if (payload_type == 47) { |
| decode_nal_sei_display_orientation(s); |
| } else if (payload_type == 1){ |
| int ret = decode_pic_timing(s); |
| av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type); |
| skip_bits(gb, 8 * payload_size); |
| return ret; |
| } else if (payload_type == 129){ |
| active_parameter_sets(s); |
| av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type); |
| } else { |
| av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type); |
| skip_bits(gb, 8*payload_size); |
| } |
| } else { /* nal_unit_type == NAL_SEI_SUFFIX */ |
| if (payload_type == 132 /* && s->decode_checksum_sei */) |
| decode_nal_sei_decoded_picture_hash(s); |
| else { |
| av_log(s->avctx, AV_LOG_DEBUG, "Skipped SUFFIX SEI %d\n", payload_type); |
| skip_bits(gb, 8 * payload_size); |
| } |
| } |
| return 1; |
| } |
| |
| static int more_rbsp_data(GetBitContext *gb) |
| { |
| return get_bits_left(gb) > 0 && show_bits(gb, 8) != 0x80; |
| } |
| |
| int ff_hevc_decode_nal_sei(HEVCContext *s) |
| { |
| int ret; |
| |
| do { |
| ret = decode_nal_sei_message(s); |
| if (ret < 0) |
| return(AVERROR(ENOMEM)); |
| } while (more_rbsp_data(&s->HEVClc->gb)); |
| return 1; |
| } |
