mirror of
https://github.com/FFmpeg/FFmpeg.git
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244 lines
8.9 KiB
C
244 lines
8.9 KiB
C
/*
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* HEVC Supplementary Enhancement Information messages
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*
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* Copyright (C) 2012 - 2013 Guillaume Martres
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* Copyright (C) 2012 - 2013 Gildas Cocherel
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* Copyright (C) 2013 Vittorio Giovara
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "bytestream.h"
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#include "golomb.h"
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#include "ps.h"
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#include "sei.h"
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static int decode_nal_sei_decoded_picture_hash(HEVCSEIPictureHash *s,
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GetByteContext *gb)
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{
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int cIdx;
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uint8_t hash_type;
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//uint16_t picture_crc;
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//uint32_t picture_checksum;
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hash_type = bytestream2_get_byte(gb);
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for (cIdx = 0; cIdx < 3/*((s->sps->chroma_format_idc == 0) ? 1 : 3)*/; cIdx++) {
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if (hash_type == 0) {
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s->is_md5 = 1;
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bytestream2_get_buffer(gb, s->md5[cIdx], sizeof(s->md5[cIdx]));
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} else if (hash_type == 1) {
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// picture_crc = get_bits(gb, 16);
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} else if (hash_type == 2) {
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// picture_checksum = get_bits_long(gb, 32);
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}
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}
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return 0;
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}
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static int decode_nal_sei_pic_timing(HEVCSEI *s, GetBitContext *gb,
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const HEVCParamSets *ps, void *logctx)
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{
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HEVCSEIPictureTiming *h = &s->picture_timing;
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const HEVCSPS *sps = ps->sps_list[s->active_seq_parameter_set_id];
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if (!sps)
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return(AVERROR(ENOMEM));
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if (sps->vui.frame_field_info_present_flag) {
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int pic_struct = get_bits(gb, 4);
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h->picture_struct = AV_PICTURE_STRUCTURE_UNKNOWN;
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if (pic_struct == 2 || pic_struct == 10 || pic_struct == 12) {
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av_log(logctx, AV_LOG_DEBUG, "BOTTOM Field\n");
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h->picture_struct = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
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} else if (pic_struct == 1 || pic_struct == 9 || pic_struct == 11) {
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av_log(logctx, AV_LOG_DEBUG, "TOP Field\n");
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h->picture_struct = AV_PICTURE_STRUCTURE_TOP_FIELD;
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} else if (pic_struct == 7) {
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av_log(logctx, AV_LOG_DEBUG, "Frame/Field Doubling\n");
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h->picture_struct = HEVC_SEI_PIC_STRUCT_FRAME_DOUBLING;
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} else if (pic_struct == 8) {
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av_log(logctx, AV_LOG_DEBUG, "Frame/Field Tripling\n");
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h->picture_struct = HEVC_SEI_PIC_STRUCT_FRAME_TRIPLING;
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}
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}
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return 0;
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}
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static int decode_nal_sei_active_parameter_sets(HEVCSEI *s, GetBitContext *gb, void *logctx)
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{
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int num_sps_ids_minus1;
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unsigned active_seq_parameter_set_id;
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get_bits(gb, 4); // active_video_parameter_set_id
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get_bits(gb, 1); // self_contained_cvs_flag
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get_bits(gb, 1); // num_sps_ids_minus1
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num_sps_ids_minus1 = get_ue_golomb_long(gb); // num_sps_ids_minus1
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if (num_sps_ids_minus1 < 0 || num_sps_ids_minus1 > 15) {
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av_log(logctx, AV_LOG_ERROR, "num_sps_ids_minus1 %d invalid\n", num_sps_ids_minus1);
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return AVERROR_INVALIDDATA;
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}
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active_seq_parameter_set_id = get_ue_golomb_long(gb);
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if (active_seq_parameter_set_id >= HEVC_MAX_SPS_COUNT) {
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av_log(logctx, AV_LOG_ERROR, "active_parameter_set_id %d invalid\n", active_seq_parameter_set_id);
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return AVERROR_INVALIDDATA;
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}
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s->active_seq_parameter_set_id = active_seq_parameter_set_id;
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return 0;
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}
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static int decode_nal_sei_timecode(HEVCSEITimeCode *s, GetBitContext *gb)
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{
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s->num_clock_ts = get_bits(gb, 2);
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for (int i = 0; i < s->num_clock_ts; i++) {
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s->clock_timestamp_flag[i] = get_bits(gb, 1);
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if (s->clock_timestamp_flag[i]) {
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s->units_field_based_flag[i] = get_bits(gb, 1);
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s->counting_type[i] = get_bits(gb, 5);
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s->full_timestamp_flag[i] = get_bits(gb, 1);
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s->discontinuity_flag[i] = get_bits(gb, 1);
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s->cnt_dropped_flag[i] = get_bits(gb, 1);
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s->n_frames[i] = get_bits(gb, 9);
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if (s->full_timestamp_flag[i]) {
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s->seconds_value[i] = av_clip(get_bits(gb, 6), 0, 59);
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s->minutes_value[i] = av_clip(get_bits(gb, 6), 0, 59);
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s->hours_value[i] = av_clip(get_bits(gb, 5), 0, 23);
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} else {
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s->seconds_flag[i] = get_bits(gb, 1);
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if (s->seconds_flag[i]) {
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s->seconds_value[i] = av_clip(get_bits(gb, 6), 0, 59);
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s->minutes_flag[i] = get_bits(gb, 1);
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if (s->minutes_flag[i]) {
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s->minutes_value[i] = av_clip(get_bits(gb, 6), 0, 59);
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s->hours_flag[i] = get_bits(gb, 1);
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if (s->hours_flag[i]) {
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s->hours_value[i] = av_clip(get_bits(gb, 5), 0, 23);
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}
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}
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}
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}
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s->time_offset_length[i] = get_bits(gb, 5);
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if (s->time_offset_length[i] > 0) {
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s->time_offset_value[i] = get_bits_long(gb, s->time_offset_length[i]);
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}
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}
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}
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s->present = 1;
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return 0;
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}
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static int decode_nal_sei_prefix(GetBitContext *gb, GetByteContext *gbyte,
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void *logctx, HEVCSEI *s,
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const HEVCParamSets *ps, int type)
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{
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switch (type) {
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case 256: // Mismatched value from HM 8.1
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return decode_nal_sei_decoded_picture_hash(&s->picture_hash, gbyte);
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case SEI_TYPE_PIC_TIMING:
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return decode_nal_sei_pic_timing(s, gb, ps, logctx);
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case SEI_TYPE_ACTIVE_PARAMETER_SETS:
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return decode_nal_sei_active_parameter_sets(s, gb, logctx);
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case SEI_TYPE_TIME_CODE:
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return decode_nal_sei_timecode(&s->timecode, gb);
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default: {
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int ret = ff_h2645_sei_message_decode(&s->common, type, AV_CODEC_ID_HEVC,
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gb, gbyte, logctx);
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if (ret == FF_H2645_SEI_MESSAGE_UNHANDLED)
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av_log(logctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", type);
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return ret;
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}
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}
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}
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static int decode_nal_sei_suffix(GetBitContext *gb, GetByteContext *gbyte,
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void *logctx, HEVCSEI *s, int type)
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{
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switch (type) {
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case SEI_TYPE_DECODED_PICTURE_HASH:
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return decode_nal_sei_decoded_picture_hash(&s->picture_hash, gbyte);
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default:
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av_log(logctx, AV_LOG_DEBUG, "Skipped SUFFIX SEI %d\n", type);
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return 0;
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}
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}
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static int decode_nal_sei_message(GetByteContext *gb, void *logctx, HEVCSEI *s,
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const HEVCParamSets *ps, int nal_unit_type)
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{
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GetByteContext message_gbyte;
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GetBitContext message_gb;
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int payload_type = 0;
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int payload_size = 0;
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int byte = 0xFF;
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av_unused int ret;
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av_log(logctx, AV_LOG_DEBUG, "Decoding SEI\n");
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while (byte == 0xFF) {
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if (bytestream2_get_bytes_left(gb) < 2 || payload_type > INT_MAX - 255)
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return AVERROR_INVALIDDATA;
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byte = bytestream2_get_byteu(gb);
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payload_type += byte;
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}
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byte = 0xFF;
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while (byte == 0xFF) {
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if (bytestream2_get_bytes_left(gb) < 1 + payload_size)
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return AVERROR_INVALIDDATA;
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byte = bytestream2_get_byteu(gb);
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payload_size += byte;
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}
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if (bytestream2_get_bytes_left(gb) < payload_size)
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return AVERROR_INVALIDDATA;
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bytestream2_init(&message_gbyte, gb->buffer, payload_size);
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ret = init_get_bits8(&message_gb, gb->buffer, payload_size);
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av_assert1(ret >= 0);
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bytestream2_skipu(gb, payload_size);
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if (nal_unit_type == HEVC_NAL_SEI_PREFIX) {
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return decode_nal_sei_prefix(&message_gb, &message_gbyte,
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logctx, s, ps, payload_type);
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} else { /* nal_unit_type == NAL_SEI_SUFFIX */
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return decode_nal_sei_suffix(&message_gb, &message_gbyte,
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logctx, s, payload_type);
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}
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}
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int ff_hevc_decode_nal_sei(GetBitContext *gb, void *logctx, HEVCSEI *s,
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const HEVCParamSets *ps, enum HEVCNALUnitType type)
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{
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GetByteContext gbyte;
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int ret;
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av_assert1((get_bits_count(gb) % 8) == 0);
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bytestream2_init(&gbyte, gb->buffer + get_bits_count(gb) / 8,
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get_bits_left(gb) / 8);
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do {
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ret = decode_nal_sei_message(&gbyte, logctx, s, ps, type);
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if (ret < 0)
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return ret;
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} while (bytestream2_get_bytes_left(&gbyte) > 0);
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return 1;
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}
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