/* * 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); } } } #ifdef USE_FULL 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; } #endif 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 #ifdef USE_FULL 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 #endif { 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; }