FFmpeg
hevc_sei.c
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1 /*
2  * HEVC Supplementary Enhancement Information messages
3  *
4  * Copyright (C) 2012 - 2013 Guillaume Martres
5  * Copyright (C) 2012 - 2013 Gildas Cocherel
6  * Copyright (C) 2013 Vittorio Giovara
7  *
8  * This file is part of FFmpeg.
9  *
10  * FFmpeg is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU Lesser General Public
12  * License as published by the Free Software Foundation; either
13  * version 2.1 of the License, or (at your option) any later version.
14  *
15  * FFmpeg is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18  * Lesser General Public License for more details.
19  *
20  * You should have received a copy of the GNU Lesser General Public
21  * License along with FFmpeg; if not, write to the Free Software
22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23  */
24 
25 #include "bytestream.h"
26 #include "golomb.h"
27 #include "hevc_ps.h"
28 #include "hevc_sei.h"
29 
31  GetByteContext *gb)
32 {
33  int cIdx;
34  uint8_t hash_type;
35  //uint16_t picture_crc;
36  //uint32_t picture_checksum;
37  hash_type = bytestream2_get_byte(gb);
38 
39  for (cIdx = 0; cIdx < 3/*((s->sps->chroma_format_idc == 0) ? 1 : 3)*/; cIdx++) {
40  if (hash_type == 0) {
41  s->is_md5 = 1;
42  bytestream2_get_buffer(gb, s->md5[cIdx], sizeof(s->md5[cIdx]));
43  } else if (hash_type == 1) {
44  // picture_crc = get_bits(gb, 16);
45  } else if (hash_type == 2) {
46  // picture_checksum = get_bits_long(gb, 32);
47  }
48  }
49  return 0;
50 }
51 
53  const HEVCParamSets *ps, void *logctx)
54 {
55  HEVCSEIPictureTiming *h = &s->picture_timing;
56  const HEVCSPS *sps = ps->sps_list[s->active_seq_parameter_set_id];
57 
58  if (!sps)
59  return(AVERROR(ENOMEM));
60 
61  if (sps->vui.frame_field_info_present_flag) {
62  int pic_struct = get_bits(gb, 4);
63  h->picture_struct = AV_PICTURE_STRUCTURE_UNKNOWN;
64  if (pic_struct == 2 || pic_struct == 10 || pic_struct == 12) {
65  av_log(logctx, AV_LOG_DEBUG, "BOTTOM Field\n");
66  h->picture_struct = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
67  } else if (pic_struct == 1 || pic_struct == 9 || pic_struct == 11) {
68  av_log(logctx, AV_LOG_DEBUG, "TOP Field\n");
69  h->picture_struct = AV_PICTURE_STRUCTURE_TOP_FIELD;
70  } else if (pic_struct == 7) {
71  av_log(logctx, AV_LOG_DEBUG, "Frame/Field Doubling\n");
72  h->picture_struct = HEVC_SEI_PIC_STRUCT_FRAME_DOUBLING;
73  } else if (pic_struct == 8) {
74  av_log(logctx, AV_LOG_DEBUG, "Frame/Field Tripling\n");
75  h->picture_struct = HEVC_SEI_PIC_STRUCT_FRAME_TRIPLING;
76  }
77  }
78 
79  return 0;
80 }
81 
83 {
84  int num_sps_ids_minus1;
85  unsigned active_seq_parameter_set_id;
86 
87  get_bits(gb, 4); // active_video_parameter_set_id
88  get_bits(gb, 1); // self_contained_cvs_flag
89  get_bits(gb, 1); // num_sps_ids_minus1
90  num_sps_ids_minus1 = get_ue_golomb_long(gb); // num_sps_ids_minus1
91 
92  if (num_sps_ids_minus1 < 0 || num_sps_ids_minus1 > 15) {
93  av_log(logctx, AV_LOG_ERROR, "num_sps_ids_minus1 %d invalid\n", num_sps_ids_minus1);
94  return AVERROR_INVALIDDATA;
95  }
96 
97  active_seq_parameter_set_id = get_ue_golomb_long(gb);
98  if (active_seq_parameter_set_id >= HEVC_MAX_SPS_COUNT) {
99  av_log(logctx, AV_LOG_ERROR, "active_parameter_set_id %d invalid\n", active_seq_parameter_set_id);
100  return AVERROR_INVALIDDATA;
101  }
102  s->active_seq_parameter_set_id = active_seq_parameter_set_id;
103 
104  return 0;
105 }
106 
108 {
109  s->num_clock_ts = get_bits(gb, 2);
110 
111  for (int i = 0; i < s->num_clock_ts; i++) {
112  s->clock_timestamp_flag[i] = get_bits(gb, 1);
113 
114  if (s->clock_timestamp_flag[i]) {
115  s->units_field_based_flag[i] = get_bits(gb, 1);
116  s->counting_type[i] = get_bits(gb, 5);
117  s->full_timestamp_flag[i] = get_bits(gb, 1);
118  s->discontinuity_flag[i] = get_bits(gb, 1);
119  s->cnt_dropped_flag[i] = get_bits(gb, 1);
120 
121  s->n_frames[i] = get_bits(gb, 9);
122 
123  if (s->full_timestamp_flag[i]) {
124  s->seconds_value[i] = av_clip(get_bits(gb, 6), 0, 59);
125  s->minutes_value[i] = av_clip(get_bits(gb, 6), 0, 59);
126  s->hours_value[i] = av_clip(get_bits(gb, 5), 0, 23);
127  } else {
128  s->seconds_flag[i] = get_bits(gb, 1);
129  if (s->seconds_flag[i]) {
130  s->seconds_value[i] = av_clip(get_bits(gb, 6), 0, 59);
131  s->minutes_flag[i] = get_bits(gb, 1);
132  if (s->minutes_flag[i]) {
133  s->minutes_value[i] = av_clip(get_bits(gb, 6), 0, 59);
134  s->hours_flag[i] = get_bits(gb, 1);
135  if (s->hours_flag[i]) {
136  s->hours_value[i] = av_clip(get_bits(gb, 5), 0, 23);
137  }
138  }
139  }
140  }
141 
142  s->time_offset_length[i] = get_bits(gb, 5);
143  if (s->time_offset_length[i] > 0) {
144  s->time_offset_value[i] = get_bits_long(gb, s->time_offset_length[i]);
145  }
146  }
147  }
148 
149  s->present = 1;
150  return 0;
151 }
152 
154  void *logctx, HEVCSEI *s,
155  const HEVCParamSets *ps, int type)
156 {
157  switch (type) {
158  case 256: // Mismatched value from HM 8.1
159  return decode_nal_sei_decoded_picture_hash(&s->picture_hash, gbyte);
160  case SEI_TYPE_PIC_TIMING:
161  return decode_nal_sei_pic_timing(s, gb, ps, logctx);
163  return decode_nal_sei_active_parameter_sets(s, gb, logctx);
164  case SEI_TYPE_TIME_CODE:
165  return decode_nal_sei_timecode(&s->timecode, gb);
166  default: {
168  gb, gbyte, logctx);
170  av_log(logctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", type);
171  return ret;
172  }
173  }
174 }
175 
177  void *logctx, HEVCSEI *s, int type)
178 {
179  switch (type) {
181  return decode_nal_sei_decoded_picture_hash(&s->picture_hash, gbyte);
182  default:
183  av_log(logctx, AV_LOG_DEBUG, "Skipped SUFFIX SEI %d\n", type);
184  return 0;
185  }
186 }
187 
188 static int decode_nal_sei_message(GetByteContext *gb, void *logctx, HEVCSEI *s,
189  const HEVCParamSets *ps, int nal_unit_type)
190 {
191  GetByteContext message_gbyte;
192  GetBitContext message_gb;
193  int payload_type = 0;
194  int payload_size = 0;
195  int byte = 0xFF;
196  av_unused int ret;
197  av_log(logctx, AV_LOG_DEBUG, "Decoding SEI\n");
198 
199  while (byte == 0xFF) {
200  if (bytestream2_get_bytes_left(gb) < 2 || payload_type > INT_MAX - 255)
201  return AVERROR_INVALIDDATA;
202  byte = bytestream2_get_byteu(gb);
203  payload_type += byte;
204  }
205  byte = 0xFF;
206  while (byte == 0xFF) {
207  if (bytestream2_get_bytes_left(gb) < 1 + payload_size)
208  return AVERROR_INVALIDDATA;
209  byte = bytestream2_get_byteu(gb);
210  payload_size += byte;
211  }
212  if (bytestream2_get_bytes_left(gb) < payload_size)
213  return AVERROR_INVALIDDATA;
214  bytestream2_init(&message_gbyte, gb->buffer, payload_size);
215  ret = init_get_bits8(&message_gb, gb->buffer, payload_size);
216  av_assert1(ret >= 0);
217  bytestream2_skipu(gb, payload_size);
218  if (nal_unit_type == HEVC_NAL_SEI_PREFIX) {
219  return decode_nal_sei_prefix(&message_gb, &message_gbyte,
220  logctx, s, ps, payload_type);
221  } else { /* nal_unit_type == NAL_SEI_SUFFIX */
222  return decode_nal_sei_suffix(&message_gb, &message_gbyte,
223  logctx, s, payload_type);
224  }
225 }
226 
228  const HEVCParamSets *ps, enum HEVCNALUnitType type)
229 {
230  GetByteContext gbyte;
231  int ret;
232 
233  av_assert1((get_bits_count(gb) % 8) == 0);
234  bytestream2_init(&gbyte, gb->buffer + get_bits_count(gb) / 8,
235  get_bits_left(gb) / 8);
236 
237  do {
238  ret = decode_nal_sei_message(&gbyte, logctx, s, ps, type);
239  if (ret < 0)
240  return ret;
241  } while (bytestream2_get_bytes_left(&gbyte) > 0);
242  return 1;
243 }
av_clip
#define av_clip
Definition: common.h:98
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:694
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
GetByteContext
Definition: bytestream.h:33
AV_PICTURE_STRUCTURE_UNKNOWN
@ AV_PICTURE_STRUCTURE_UNKNOWN
unknown
Definition: avcodec.h:2775
get_bits_long
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:421
bytestream2_skipu
static av_always_inline void bytestream2_skipu(GetByteContext *g, unsigned int size)
Definition: bytestream.h:174
get_bits_count
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:266
av_unused
#define av_unused
Definition: attributes.h:131
decode_nal_sei_decoded_picture_hash
static int decode_nal_sei_decoded_picture_hash(HEVCSEIPictureHash *s, GetByteContext *gb)
Definition: hevc_sei.c:30
ff_h2645_sei_message_decode
int ff_h2645_sei_message_decode(H2645SEI *h, enum SEIType type, enum AVCodecID codec_id, GetBitContext *gb, GetByteContext *gbyte, void *logctx)
Decode a single SEI message.
Definition: h2645_sei.c:442
HEVCSEITimeCode
Definition: hevc_sei.h:61
golomb.h
exp golomb vlc stuff
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:335
GetBitContext
Definition: get_bits.h:108
decode_nal_sei_prefix
static int decode_nal_sei_prefix(GetBitContext *gb, GetByteContext *gbyte, void *logctx, HEVCSEI *s, const HEVCParamSets *ps, int type)
Definition: hevc_sei.c:153
type
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf type
Definition: writing_filters.txt:86
decode_nal_sei_active_parameter_sets
static int decode_nal_sei_active_parameter_sets(HEVCSEI *s, GetBitContext *gb, void *logctx)
Definition: hevc_sei.c:82
HEVCParamSets::sps_list
const HEVCSPS * sps_list[HEVC_MAX_SPS_COUNT]
RefStruct references.
Definition: hevc_ps.h:440
ff_hevc_decode_nal_sei
int ff_hevc_decode_nal_sei(GetBitContext *gb, void *logctx, HEVCSEI *s, const HEVCParamSets *ps, enum HEVCNALUnitType type)
Definition: hevc_sei.c:227
FF_H2645_SEI_MESSAGE_UNHANDLED
@ FF_H2645_SEI_MESSAGE_UNHANDLED
Definition: h2645_sei.h:139
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
init_get_bits8
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:545
s
#define s(width, name)
Definition: cbs_vp9.c:198
GetByteContext::buffer
const uint8_t * buffer
Definition: bytestream.h:34
HEVCSEI
Definition: hevc_sei.h:81
decode_nal_sei_pic_timing
static int decode_nal_sei_pic_timing(HEVCSEI *s, GetBitContext *gb, const HEVCParamSets *ps, void *logctx)
Definition: hevc_sei.c:52
HEVCSEIPictureHash
Definition: hevc_sei.h:39
HEVC_MAX_SPS_COUNT
@ HEVC_MAX_SPS_COUNT
Definition: hevc.h:112
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:201
HEVC_SEI_PIC_STRUCT_FRAME_TRIPLING
@ HEVC_SEI_PIC_STRUCT_FRAME_TRIPLING
Definition: hevc_sei.h:36
AV_PICTURE_STRUCTURE_BOTTOM_FIELD
@ AV_PICTURE_STRUCTURE_BOTTOM_FIELD
coded as bottom field
Definition: avcodec.h:2777
GetBitContext::buffer
const uint8_t * buffer
Definition: get_bits.h:109
SEI_TYPE_TIME_CODE
@ SEI_TYPE_TIME_CODE
Definition: sei.h:95
AV_PICTURE_STRUCTURE_TOP_FIELD
@ AV_PICTURE_STRUCTURE_TOP_FIELD
coded as top field
Definition: avcodec.h:2776
bytestream2_get_buffer
static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g, uint8_t *dst, unsigned int size)
Definition: bytestream.h:267
decode_nal_sei_message
static int decode_nal_sei_message(GetByteContext *gb, void *logctx, HEVCSEI *s, const HEVCParamSets *ps, int nal_unit_type)
Definition: hevc_sei.c:188
bytestream2_get_bytes_left
static av_always_inline int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:158
decode_nal_sei_timecode
static int decode_nal_sei_timecode(HEVCSEITimeCode *s, GetBitContext *gb)
Definition: hevc_sei.c:107
byte
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_WB16 unsigned int_TMPL byte
Definition: bytestream.h:99
HEVC_SEI_PIC_STRUCT_FRAME_DOUBLING
@ HEVC_SEI_PIC_STRUCT_FRAME_DOUBLING
Definition: hevc_sei.h:35
hevc_ps.h
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:245
SEI_TYPE_PIC_TIMING
@ SEI_TYPE_PIC_TIMING
Definition: sei.h:31
av_assert1
#define av_assert1(cond)
assert() equivalent, that does not lie in speed critical code.
Definition: avassert.h:56
AV_CODEC_ID_HEVC
@ AV_CODEC_ID_HEVC
Definition: codec_id.h:226
HEVCNALUnitType
HEVCNALUnitType
Table 7-1 – NAL unit type codes and NAL unit type classes in T-REC-H.265-201802.
Definition: hevc.h:28
ret
ret
Definition: filter_design.txt:187
sps
static int FUNC() sps(CodedBitstreamContext *ctx, RWContext *rw, H264RawSPS *current)
Definition: cbs_h264_syntax_template.c:260
decode_nal_sei_suffix
static int decode_nal_sei_suffix(GetBitContext *gb, GetByteContext *gbyte, void *logctx, HEVCSEI *s, int type)
Definition: hevc_sei.c:176
SEI_TYPE_DECODED_PICTURE_HASH
@ SEI_TYPE_DECODED_PICTURE_HASH
Definition: sei.h:91
get_ue_golomb_long
static unsigned get_ue_golomb_long(GetBitContext *gb)
Read an unsigned Exp-Golomb code in the range 0 to UINT32_MAX-1.
Definition: golomb.h:104
HEVCSPS
Definition: hevc_ps.h:186
bytestream.h
bytestream2_init
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:137
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
h
h
Definition: vp9dsp_template.c:2038
HEVCSEIPictureTiming
Definition: hevc_sei.h:52
HEVC_NAL_SEI_PREFIX
@ HEVC_NAL_SEI_PREFIX
Definition: hevc.h:68
SEI_TYPE_ACTIVE_PARAMETER_SETS
@ SEI_TYPE_ACTIVE_PARAMETER_SETS
Definition: sei.h:87
hevc_sei.h
HEVCParamSets
Definition: hevc_ps.h:438