| /* |
| * 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 "hevc_ps.h" |
| #include "hevc_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; |
| } |
