Merge commit '86bfcfcf2364bc837b7bb582c66a8a15a332414f'
[ffmpeg.git] / libavcodec / h264_sei.c
1 /*
2  * H.26L/H.264/AVC/JVT/14496-10/... sei decoding
3  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21
22 /**
23  * @file
24  * H.264 / AVC / MPEG4 part10 sei decoding.
25  * @author Michael Niedermayer <michaelni@gmx.at>
26  */
27
28 #include "internal.h"
29 #include "avcodec.h"
30 #include "h264.h"
31 #include "golomb.h"
32
33 //#undef NDEBUG
34 #include <assert.h>
35
36 static const uint8_t sei_num_clock_ts_table[9]={
37     1,  1,  1,  2,  2,  3,  3,  2,  3
38 };
39
40 void ff_h264_reset_sei(H264Context *h) {
41     h->sei_recovery_frame_cnt       = -1;
42     h->sei_dpb_output_delay         =  0;
43     h->sei_cpb_removal_delay        = -1;
44     h->sei_buffering_period_present =  0;
45 }
46
47 static int decode_picture_timing(H264Context *h){
48     MpegEncContext * const s = &h->s;
49     if(h->sps.nal_hrd_parameters_present_flag || h->sps.vcl_hrd_parameters_present_flag){
50         h->sei_cpb_removal_delay = get_bits_long(&s->gb, h->sps.cpb_removal_delay_length);
51         h->sei_dpb_output_delay = get_bits_long(&s->gb, h->sps.dpb_output_delay_length);
52     }
53     if(h->sps.pic_struct_present_flag){
54         unsigned int i, num_clock_ts;
55         h->sei_pic_struct = get_bits(&s->gb, 4);
56         h->sei_ct_type    = 0;
57
58         if (h->sei_pic_struct > SEI_PIC_STRUCT_FRAME_TRIPLING)
59             return -1;
60
61         num_clock_ts = sei_num_clock_ts_table[h->sei_pic_struct];
62
63         for (i = 0 ; i < num_clock_ts ; i++){
64             if(get_bits(&s->gb, 1)){                  /* clock_timestamp_flag */
65                 unsigned int full_timestamp_flag;
66                 h->sei_ct_type |= 1<<get_bits(&s->gb, 2);
67                 skip_bits(&s->gb, 1);                 /* nuit_field_based_flag */
68                 skip_bits(&s->gb, 5);                 /* counting_type */
69                 full_timestamp_flag = get_bits(&s->gb, 1);
70                 skip_bits(&s->gb, 1);                 /* discontinuity_flag */
71                 skip_bits(&s->gb, 1);                 /* cnt_dropped_flag */
72                 skip_bits(&s->gb, 8);                 /* n_frames */
73                 if(full_timestamp_flag){
74                     skip_bits(&s->gb, 6);             /* seconds_value 0..59 */
75                     skip_bits(&s->gb, 6);             /* minutes_value 0..59 */
76                     skip_bits(&s->gb, 5);             /* hours_value 0..23 */
77                 }else{
78                     if(get_bits(&s->gb, 1)){          /* seconds_flag */
79                         skip_bits(&s->gb, 6);         /* seconds_value range 0..59 */
80                         if(get_bits(&s->gb, 1)){      /* minutes_flag */
81                             skip_bits(&s->gb, 6);     /* minutes_value 0..59 */
82                             if(get_bits(&s->gb, 1))   /* hours_flag */
83                                 skip_bits(&s->gb, 5); /* hours_value 0..23 */
84                         }
85                     }
86                 }
87                 if(h->sps.time_offset_length > 0)
88                     skip_bits(&s->gb, h->sps.time_offset_length); /* time_offset */
89             }
90         }
91
92         if(s->avctx->debug & FF_DEBUG_PICT_INFO)
93             av_log(s->avctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n", h->sei_ct_type, h->sei_pic_struct);
94     }
95     return 0;
96 }
97
98 static int decode_user_data_itu_t_t35(H264Context *h, int size) {
99     MpegEncContext * const s = &h->s;
100     uint32_t user_identifier;
101     int dtg_active_format;
102
103     if (size < 7)
104         return -1;
105     size -= 7;
106
107     skip_bits(&s->gb, 8);   // country_code
108     skip_bits(&s->gb, 16);  // provider_code
109     user_identifier = get_bits_long(&s->gb, 32);
110
111     switch (user_identifier) {
112         case 0x44544731:    // "DTG1" - AFD_data
113             if (size < 1)
114                 return -1;
115             skip_bits(&s->gb, 1);
116             if (get_bits(&s->gb, 1)) {
117                 skip_bits(&s->gb, 6);
118                 if (size < 2)
119                     return -1;
120                 skip_bits(&s->gb, 4);
121                 dtg_active_format = get_bits(&s->gb, 4);
122                 s->avctx->dtg_active_format = dtg_active_format;
123             } else {
124                 skip_bits(&s->gb, 6);
125             }
126             break;
127         default:
128             skip_bits(&s->gb, size * 8);
129             break;
130     }
131
132     return 0;
133 }
134
135 static int decode_unregistered_user_data(H264Context *h, int size){
136     MpegEncContext * const s = &h->s;
137     uint8_t user_data[16+256];
138     int e, build, i;
139
140     if(size<16)
141         return -1;
142
143     for(i=0; i<sizeof(user_data)-1 && i<size; i++){
144         user_data[i]= get_bits(&s->gb, 8);
145     }
146
147     user_data[i]= 0;
148     e= sscanf(user_data+16, "x264 - core %d"/*%s - H.264/MPEG-4 AVC codec - Copyleft 2005 - http://www.videolan.org/x264.html*/, &build);
149     if(e==1 && build>0)
150         h->x264_build= build;
151     if(e==1 && build==1 && !strncmp(user_data+16, "x264 - core 0000", 16))
152         h->x264_build = 67;
153
154     if(s->avctx->debug & FF_DEBUG_BUGS)
155         av_log(s->avctx, AV_LOG_DEBUG, "user data:\"%s\"\n", user_data+16);
156
157     for(; i<size; i++)
158         skip_bits(&s->gb, 8);
159
160     return 0;
161 }
162
163 static int decode_recovery_point(H264Context *h){
164     MpegEncContext * const s = &h->s;
165
166     h->sei_recovery_frame_cnt = get_ue_golomb(&s->gb);
167     skip_bits(&s->gb, 4);       /* 1b exact_match_flag, 1b broken_link_flag, 2b changing_slice_group_idc */
168
169     return 0;
170 }
171
172 static int decode_buffering_period(H264Context *h){
173     MpegEncContext * const s = &h->s;
174     unsigned int sps_id;
175     int sched_sel_idx;
176     SPS *sps;
177
178     sps_id = get_ue_golomb_31(&s->gb);
179     if(sps_id > 31 || !h->sps_buffers[sps_id]) {
180         av_log(h->s.avctx, AV_LOG_ERROR, "non-existing SPS %d referenced in buffering period\n", sps_id);
181         return -1;
182     }
183     sps = h->sps_buffers[sps_id];
184
185     // NOTE: This is really so duplicated in the standard... See H.264, D.1.1
186     if (sps->nal_hrd_parameters_present_flag) {
187         for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
188             h->initial_cpb_removal_delay[sched_sel_idx] = get_bits_long(&s->gb, sps->initial_cpb_removal_delay_length);
189             skip_bits(&s->gb, sps->initial_cpb_removal_delay_length); // initial_cpb_removal_delay_offset
190         }
191     }
192     if (sps->vcl_hrd_parameters_present_flag) {
193         for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
194             h->initial_cpb_removal_delay[sched_sel_idx] = get_bits_long(&s->gb, sps->initial_cpb_removal_delay_length);
195             skip_bits(&s->gb, sps->initial_cpb_removal_delay_length); // initial_cpb_removal_delay_offset
196         }
197     }
198
199     h->sei_buffering_period_present = 1;
200     return 0;
201 }
202
203 int ff_h264_decode_sei(H264Context *h){
204     MpegEncContext * const s = &h->s;
205
206     while (get_bits_left(&s->gb) > 16) {
207         int size, type;
208
209         type=0;
210         do{
211             if (get_bits_left(&s->gb) < 8)
212                 return -1;
213             type+= show_bits(&s->gb, 8);
214         }while(get_bits(&s->gb, 8) == 255);
215
216         size=0;
217         do{
218             if (get_bits_left(&s->gb) < 8)
219                 return -1;
220             size+= show_bits(&s->gb, 8);
221         }while(get_bits(&s->gb, 8) == 255);
222
223         if(s->avctx->debug&FF_DEBUG_STARTCODE)
224             av_log(h->s.avctx, AV_LOG_DEBUG, "SEI %d len:%d\n", type, size);
225
226         switch(type){
227         case SEI_TYPE_PIC_TIMING: // Picture timing SEI
228             if(decode_picture_timing(h) < 0)
229                 return -1;
230             break;
231         case SEI_TYPE_USER_DATA_ITU_T_T35:
232             if(decode_user_data_itu_t_t35(h, size) < 0)
233                 return -1;
234             break;
235         case SEI_TYPE_USER_DATA_UNREGISTERED:
236             if(decode_unregistered_user_data(h, size) < 0)
237                 return -1;
238             break;
239         case SEI_TYPE_RECOVERY_POINT:
240             if(decode_recovery_point(h) < 0)
241                 return -1;
242             break;
243         case SEI_BUFFERING_PERIOD:
244             if(decode_buffering_period(h) < 0)
245                 return -1;
246             break;
247         default:
248             skip_bits(&s->gb, 8*size);
249         }
250
251         //FIXME check bits here
252         align_get_bits(&s->gb);
253     }
254
255     return 0;
256 }