/* * 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 "bytestream.h" #include "golomb.h" #include "ps.h" #include "sei.h" static int decode_nal_sei_decoded_picture_hash(HEVCSEIPictureHash *s, GetByteContext *gb) { int cIdx; uint8_t hash_type; //uint16_t picture_crc; //uint32_t picture_checksum; hash_type = bytestream2_get_byte(gb); for (cIdx = 0; cIdx < 3/*((s->sps->chroma_format_idc == 0) ? 1 : 3)*/; cIdx++) { if (hash_type == 0) { s->is_md5 = 1; bytestream2_get_buffer(gb, s->md5[cIdx], sizeof(s->md5[cIdx])); } else if (hash_type == 1) { // picture_crc = get_bits(gb, 16); } else if (hash_type == 2) { // picture_checksum = get_bits_long(gb, 32); } } return 0; } static int decode_nal_sei_pic_timing(HEVCSEI *s, GetBitContext *gb, const HEVCParamSets *ps, void *logctx) { HEVCSEIPictureTiming *h = &s->picture_timing; const HEVCSPS *sps = ps->sps_list[s->active_seq_parameter_set_id]; if (!sps) return(AVERROR(ENOMEM)); if (sps->vui.frame_field_info_present_flag) { int pic_struct = get_bits(gb, 4); h->picture_struct = AV_PICTURE_STRUCTURE_UNKNOWN; if (pic_struct == 2 || pic_struct == 10 || pic_struct == 12) { av_log(logctx, AV_LOG_DEBUG, "BOTTOM Field\n"); h->picture_struct = AV_PICTURE_STRUCTURE_BOTTOM_FIELD; } else if (pic_struct == 1 || pic_struct == 9 || pic_struct == 11) { av_log(logctx, AV_LOG_DEBUG, "TOP Field\n"); h->picture_struct = AV_PICTURE_STRUCTURE_TOP_FIELD; } else if (pic_struct == 7) { av_log(logctx, AV_LOG_DEBUG, "Frame/Field Doubling\n"); h->picture_struct = HEVC_SEI_PIC_STRUCT_FRAME_DOUBLING; } else if (pic_struct == 8) { av_log(logctx, AV_LOG_DEBUG, "Frame/Field Tripling\n"); h->picture_struct = HEVC_SEI_PIC_STRUCT_FRAME_TRIPLING; } } return 0; } static int decode_nal_sei_active_parameter_sets(HEVCSEI *s, GetBitContext *gb, void *logctx) { int num_sps_ids_minus1; 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 if (num_sps_ids_minus1 < 0 || num_sps_ids_minus1 > 15) { av_log(logctx, AV_LOG_ERROR, "num_sps_ids_minus1 %d invalid\n", num_sps_ids_minus1); return AVERROR_INVALIDDATA; } active_seq_parameter_set_id = get_ue_golomb_long(gb); if (active_seq_parameter_set_id >= HEVC_MAX_SPS_COUNT) { av_log(logctx, 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; return 0; } static int decode_nal_sei_timecode(HEVCSEITimeCode *s, GetBitContext *gb) { s->num_clock_ts = get_bits(gb, 2); for (int i = 0; i < s->num_clock_ts; i++) { s->clock_timestamp_flag[i] = get_bits(gb, 1); if (s->clock_timestamp_flag[i]) { s->units_field_based_flag[i] = get_bits(gb, 1); s->counting_type[i] = get_bits(gb, 5); s->full_timestamp_flag[i] = get_bits(gb, 1); s->discontinuity_flag[i] = get_bits(gb, 1); s->cnt_dropped_flag[i] = get_bits(gb, 1); s->n_frames[i] = get_bits(gb, 9); if (s->full_timestamp_flag[i]) { s->seconds_value[i] = av_clip(get_bits(gb, 6), 0, 59); s->minutes_value[i] = av_clip(get_bits(gb, 6), 0, 59); s->hours_value[i] = av_clip(get_bits(gb, 5), 0, 23); } else { s->seconds_flag[i] = get_bits(gb, 1); if (s->seconds_flag[i]) { s->seconds_value[i] = av_clip(get_bits(gb, 6), 0, 59); s->minutes_flag[i] = get_bits(gb, 1); if (s->minutes_flag[i]) { s->minutes_value[i] = av_clip(get_bits(gb, 6), 0, 59); s->hours_flag[i] = get_bits(gb, 1); if (s->hours_flag[i]) { s->hours_value[i] = av_clip(get_bits(gb, 5), 0, 23); } } } } s->time_offset_length[i] = get_bits(gb, 5); if (s->time_offset_length[i] > 0) { s->time_offset_value[i] = get_bits_long(gb, s->time_offset_length[i]); } } } s->present = 1; return 0; } static int decode_nal_sei_prefix(GetBitContext *gb, GetByteContext *gbyte, void *logctx, HEVCSEI *s, const HEVCParamSets *ps, int type) { switch (type) { case 256: // Mismatched value from HM 8.1 return decode_nal_sei_decoded_picture_hash(&s->picture_hash, gbyte); case SEI_TYPE_PIC_TIMING: return decode_nal_sei_pic_timing(s, gb, ps, logctx); case SEI_TYPE_ACTIVE_PARAMETER_SETS: return decode_nal_sei_active_parameter_sets(s, gb, logctx); case SEI_TYPE_TIME_CODE: return decode_nal_sei_timecode(&s->timecode, gb); default: { int ret = ff_h2645_sei_message_decode(&s->common, type, AV_CODEC_ID_HEVC, gb, gbyte, logctx); if (ret == FF_H2645_SEI_MESSAGE_UNHANDLED) av_log(logctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", type); return ret; } } } static int decode_nal_sei_suffix(GetBitContext *gb, GetByteContext *gbyte, void *logctx, HEVCSEI *s, int type) { switch (type) { case SEI_TYPE_DECODED_PICTURE_HASH: return decode_nal_sei_decoded_picture_hash(&s->picture_hash, gbyte); default: av_log(logctx, AV_LOG_DEBUG, "Skipped SUFFIX SEI %d\n", type); return 0; } } static int decode_nal_sei_message(GetByteContext *gb, void *logctx, HEVCSEI *s, const HEVCParamSets *ps, int nal_unit_type) { GetByteContext message_gbyte; GetBitContext message_gb; int payload_type = 0; int payload_size = 0; int byte = 0xFF; av_unused int ret; av_log(logctx, AV_LOG_DEBUG, "Decoding SEI\n"); while (byte == 0xFF) { if (bytestream2_get_bytes_left(gb) < 2 || payload_type > INT_MAX - 255) return AVERROR_INVALIDDATA; byte = bytestream2_get_byteu(gb); payload_type += byte; } byte = 0xFF; while (byte == 0xFF) { if (bytestream2_get_bytes_left(gb) < 1 + payload_size) return AVERROR_INVALIDDATA; byte = bytestream2_get_byteu(gb); payload_size += byte; } if (bytestream2_get_bytes_left(gb) < payload_size) return AVERROR_INVALIDDATA; bytestream2_init(&message_gbyte, gb->buffer, payload_size); ret = init_get_bits8(&message_gb, gb->buffer, payload_size); av_assert1(ret >= 0); bytestream2_skipu(gb, payload_size); if (nal_unit_type == HEVC_NAL_SEI_PREFIX) { return decode_nal_sei_prefix(&message_gb, &message_gbyte, logctx, s, ps, payload_type); } else { /* nal_unit_type == NAL_SEI_SUFFIX */ return decode_nal_sei_suffix(&message_gb, &message_gbyte, logctx, s, payload_type); } } int ff_hevc_decode_nal_sei(GetBitContext *gb, void *logctx, HEVCSEI *s, const HEVCParamSets *ps, enum HEVCNALUnitType type) { GetByteContext gbyte; int ret; av_assert1((get_bits_count(gb) % 8) == 0); bytestream2_init(&gbyte, gb->buffer + get_bits_count(gb) / 8, get_bits_left(gb) / 8); do { ret = decode_nal_sei_message(&gbyte, logctx, s, ps, type); if (ret < 0) return ret; } while (bytestream2_get_bytes_left(&gbyte) > 0); return 1; }