Fix wmv1 encoding if all other msmpeg4-related encoders were disabled.
[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 "avcodec.h"
29 #include "golomb.h"
30 #include "h264.h"
31 #include "internal.h"
32
33 static const uint8_t sei_num_clock_ts_table[9] = {
34     1, 1, 1, 2, 2, 3, 3, 2, 3
35 };
36
37 void ff_h264_reset_sei(H264Context *h)
38 {
39     h->sei_recovery_frame_cnt       = -1;
40     h->sei_dpb_output_delay         =  0;
41     h->sei_cpb_removal_delay        = -1;
42     h->sei_buffering_period_present =  0;
43     h->sei_frame_packing_present    =  0;
44 }
45
46 static int decode_picture_timing(H264Context *h)
47 {
48     SPS *sps = &h->sps;
49     int i;
50
51     for (i = 0; i<MAX_SPS_COUNT; i++)
52         if (!sps->log2_max_frame_num && h->sps_buffers[i])
53             sps = h->sps_buffers[i];
54
55     if (sps->nal_hrd_parameters_present_flag || sps->vcl_hrd_parameters_present_flag) {
56         h->sei_cpb_removal_delay = get_bits_long(&h->gb,
57                                                  sps->cpb_removal_delay_length);
58         h->sei_dpb_output_delay  = get_bits_long(&h->gb,
59                                                  sps->dpb_output_delay_length);
60     }
61     if (sps->pic_struct_present_flag) {
62         unsigned int i, num_clock_ts;
63
64         h->sei_pic_struct = get_bits(&h->gb, 4);
65         h->sei_ct_type    = 0;
66
67         if (h->sei_pic_struct > SEI_PIC_STRUCT_FRAME_TRIPLING)
68             return AVERROR_INVALIDDATA;
69
70         num_clock_ts = sei_num_clock_ts_table[h->sei_pic_struct];
71
72         for (i = 0; i < num_clock_ts; i++) {
73             if (get_bits(&h->gb, 1)) {                /* clock_timestamp_flag */
74                 unsigned int full_timestamp_flag;
75
76                 h->sei_ct_type |= 1 << get_bits(&h->gb, 2);
77                 skip_bits(&h->gb, 1);                 /* nuit_field_based_flag */
78                 skip_bits(&h->gb, 5);                 /* counting_type */
79                 full_timestamp_flag = get_bits(&h->gb, 1);
80                 skip_bits(&h->gb, 1);                 /* discontinuity_flag */
81                 skip_bits(&h->gb, 1);                 /* cnt_dropped_flag */
82                 skip_bits(&h->gb, 8);                 /* n_frames */
83                 if (full_timestamp_flag) {
84                     skip_bits(&h->gb, 6);             /* seconds_value 0..59 */
85                     skip_bits(&h->gb, 6);             /* minutes_value 0..59 */
86                     skip_bits(&h->gb, 5);             /* hours_value 0..23 */
87                 } else {
88                     if (get_bits(&h->gb, 1)) {        /* seconds_flag */
89                         skip_bits(&h->gb, 6);         /* seconds_value range 0..59 */
90                         if (get_bits(&h->gb, 1)) {    /* minutes_flag */
91                             skip_bits(&h->gb, 6);     /* minutes_value 0..59 */
92                             if (get_bits(&h->gb, 1))  /* hours_flag */
93                                 skip_bits(&h->gb, 5); /* hours_value 0..23 */
94                         }
95                     }
96                 }
97                 if (sps->time_offset_length > 0)
98                     skip_bits(&h->gb,
99                               sps->time_offset_length); /* time_offset */
100             }
101         }
102
103         if (h->avctx->debug & FF_DEBUG_PICT_INFO)
104             av_log(h->avctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n",
105                    h->sei_ct_type, h->sei_pic_struct);
106     }
107     return 0;
108 }
109
110 static int decode_user_data_itu_t_t35(H264Context *h, int size)
111 {
112     uint32_t user_identifier;
113     int dtg_active_format;
114
115     if (size < 7)
116         return -1;
117     size -= 7;
118
119     skip_bits(&h->gb, 8);   // country_code
120     skip_bits(&h->gb, 16);  // provider_code
121     user_identifier = get_bits_long(&h->gb, 32);
122
123     switch (user_identifier) {
124         case 0x44544731:    // "DTG1" - AFD_data
125             if (size < 1)
126                 return -1;
127             skip_bits(&h->gb, 1);
128             if (get_bits(&h->gb, 1)) {
129                 skip_bits(&h->gb, 6);
130                 if (size < 2)
131                     return -1;
132                 skip_bits(&h->gb, 4);
133                 dtg_active_format = get_bits(&h->gb, 4);
134                 h->avctx->dtg_active_format = dtg_active_format;
135             } else {
136                 skip_bits(&h->gb, 6);
137             }
138             break;
139         default:
140             skip_bits(&h->gb, size * 8);
141             break;
142     }
143
144     return 0;
145 }
146
147 static int decode_unregistered_user_data(H264Context *h, int size)
148 {
149     uint8_t user_data[16 + 256];
150     int e, build, i;
151
152     if (size < 16)
153         return AVERROR_INVALIDDATA;
154
155     for (i = 0; i < sizeof(user_data) - 1 && i < size; i++)
156         user_data[i] = get_bits(&h->gb, 8);
157
158     user_data[i] = 0;
159     e = sscanf(user_data + 16, "x264 - core %d", &build);
160     if (e == 1 && build > 0)
161         h->x264_build = build;
162     if (e == 1 && build == 1 && !strncmp(user_data+16, "x264 - core 0000", 16))
163         h->x264_build = 67;
164
165     if (h->avctx->debug & FF_DEBUG_BUGS)
166         av_log(h->avctx, AV_LOG_DEBUG, "user data:\"%s\"\n", user_data + 16);
167
168     for (; i < size; i++)
169         skip_bits(&h->gb, 8);
170
171     return 0;
172 }
173
174 static int decode_recovery_point(H264Context *h)
175 {
176     h->sei_recovery_frame_cnt = get_ue_golomb(&h->gb);
177
178     /* 1b exact_match_flag,
179      * 1b broken_link_flag,
180      * 2b changing_slice_group_idc */
181     skip_bits(&h->gb, 4);
182
183     if (h->avctx->debug & FF_DEBUG_PICT_INFO)
184         av_log(h->avctx, AV_LOG_DEBUG, "sei_recovery_frame_cnt: %d\n", h->sei_recovery_frame_cnt);
185
186     h->has_recovery_point = 1;
187
188     return 0;
189 }
190
191 static int decode_buffering_period(H264Context *h)
192 {
193     unsigned int sps_id;
194     int sched_sel_idx;
195     SPS *sps;
196
197     sps_id = get_ue_golomb_31(&h->gb);
198     if (sps_id > 31 || !h->sps_buffers[sps_id]) {
199         av_log(h->avctx, AV_LOG_ERROR,
200                "non-existing SPS %d referenced in buffering period\n", sps_id);
201         return AVERROR_INVALIDDATA;
202     }
203     sps = h->sps_buffers[sps_id];
204
205     // NOTE: This is really so duplicated in the standard... See H.264, D.1.1
206     if (sps->nal_hrd_parameters_present_flag) {
207         for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
208             h->initial_cpb_removal_delay[sched_sel_idx] =
209                 get_bits_long(&h->gb, sps->initial_cpb_removal_delay_length);
210             // initial_cpb_removal_delay_offset
211             skip_bits(&h->gb, sps->initial_cpb_removal_delay_length);
212         }
213     }
214     if (sps->vcl_hrd_parameters_present_flag) {
215         for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
216             h->initial_cpb_removal_delay[sched_sel_idx] =
217                 get_bits_long(&h->gb, sps->initial_cpb_removal_delay_length);
218             // initial_cpb_removal_delay_offset
219             skip_bits(&h->gb, sps->initial_cpb_removal_delay_length);
220         }
221     }
222
223     h->sei_buffering_period_present = 1;
224     return 0;
225 }
226
227 static int decode_frame_packing_arrangement(H264Context *h)
228 {
229     h->sei_fpa.frame_packing_arrangement_id          = get_ue_golomb(&h->gb);
230     h->sei_fpa.frame_packing_arrangement_cancel_flag = get_bits1(&h->gb);
231     h->sei_frame_packing_present = !h->sei_fpa.frame_packing_arrangement_cancel_flag;
232
233     if (h->sei_frame_packing_present) {
234         h->sei_fpa.frame_packing_arrangement_type =
235         h->frame_packing_arrangement_type = get_bits(&h->gb, 7);
236         h->sei_fpa.quincunx_sampling_flag         =
237         h->quincunx_subsampling           = get_bits1(&h->gb);
238         h->sei_fpa.content_interpretation_type    =
239         h->content_interpretation_type    = get_bits(&h->gb, 6);
240
241         // the following skips: spatial_flipping_flag, frame0_flipped_flag,
242         // field_views_flag, current_frame_is_frame0_flag,
243         // frame0_self_contained_flag, frame1_self_contained_flag
244         skip_bits(&h->gb, 6);
245
246         if (!h->quincunx_subsampling && h->frame_packing_arrangement_type != 5)
247             skip_bits(&h->gb, 16);      // frame[01]_grid_position_[xy]
248         skip_bits(&h->gb, 8);           // frame_packing_arrangement_reserved_byte
249         h->sei_fpa.frame_packing_arrangement_repetition_period = get_ue_golomb(&h->gb) /* frame_packing_arrangement_repetition_period */;
250     }
251     skip_bits1(&h->gb);                 // frame_packing_arrangement_extension_flag
252
253     if (h->avctx->debug & FF_DEBUG_PICT_INFO)
254         av_log(h->avctx, AV_LOG_DEBUG, "SEI FPA %d %d %d %d %d %d\n",
255                                        h->sei_fpa.frame_packing_arrangement_id,
256                                        h->sei_fpa.frame_packing_arrangement_cancel_flag,
257                                        h->sei_fpa.frame_packing_arrangement_type,
258                                        h->sei_fpa.quincunx_sampling_flag,
259                                        h->sei_fpa.content_interpretation_type,
260                                        h->sei_fpa.frame_packing_arrangement_repetition_period);
261
262     return 0;
263 }
264
265 int ff_h264_decode_sei(H264Context *h)
266 {
267     while (get_bits_left(&h->gb) > 16) {
268         int type = 0;
269         unsigned size = 0;
270         unsigned next;
271         int ret  = 0;
272
273         do {
274             if (get_bits_left(&h->gb) < 8)
275                 return AVERROR_INVALIDDATA;
276             type += show_bits(&h->gb, 8);
277         } while (get_bits(&h->gb, 8) == 255);
278
279         do {
280             if (get_bits_left(&h->gb) < 8)
281                 return AVERROR_INVALIDDATA;
282             size += show_bits(&h->gb, 8);
283         } while (get_bits(&h->gb, 8) == 255);
284
285         if (h->avctx->debug&FF_DEBUG_STARTCODE)
286             av_log(h->avctx, AV_LOG_DEBUG, "SEI %d len:%d\n", type, size);
287
288         if (size > get_bits_left(&h->gb) / 8) {
289             av_log(h->avctx, AV_LOG_ERROR, "SEI type %d size %d truncated at %d\n",
290                    type, 8*size, get_bits_left(&h->gb));
291             return AVERROR_INVALIDDATA;
292         }
293         next = get_bits_count(&h->gb) + 8 * size;
294
295         switch (type) {
296         case SEI_TYPE_PIC_TIMING: // Picture timing SEI
297             ret = decode_picture_timing(h);
298             if (ret < 0)
299                 return ret;
300             break;
301         case SEI_TYPE_USER_DATA_ITU_T_T35:
302             if (decode_user_data_itu_t_t35(h, size) < 0)
303                 return -1;
304             break;
305         case SEI_TYPE_USER_DATA_UNREGISTERED:
306             ret = decode_unregistered_user_data(h, size);
307             if (ret < 0)
308                 return ret;
309             break;
310         case SEI_TYPE_RECOVERY_POINT:
311             ret = decode_recovery_point(h);
312             if (ret < 0)
313                 return ret;
314             break;
315         case SEI_TYPE_BUFFERING_PERIOD:
316             ret = decode_buffering_period(h);
317             if (ret < 0)
318                 return ret;
319             break;
320         case SEI_TYPE_FRAME_PACKING:
321             ret = decode_frame_packing_arrangement(h);
322             if (ret < 0)
323                 return ret;
324             break;
325         default:
326             av_log(h->avctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);
327         }
328         skip_bits_long(&h->gb, next - get_bits_count(&h->gb));
329
330         // FIXME check bits here
331         align_get_bits(&h->gb);
332     }
333
334     return 0;
335 }
336
337 const char* ff_h264_sei_stereo_mode(H264Context *h)
338 {
339     if (h->sei_fpa.frame_packing_arrangement_cancel_flag == 0) {
340         switch (h->sei_fpa.frame_packing_arrangement_type) {
341             case SEI_FPA_TYPE_CHECKERBOARD:
342                 if (h->sei_fpa.content_interpretation_type == 2)
343                     return "checkerboard_rl";
344                 else
345                     return "checkerboard_lr";
346             case SEI_FPA_TYPE_INTERLEAVE_COLUMN:
347                 if (h->sei_fpa.content_interpretation_type == 2)
348                     return "col_interleaved_rl";
349                 else
350                     return "col_interleaved_lr";
351             case SEI_FPA_TYPE_INTERLEAVE_ROW:
352                 if (h->sei_fpa.content_interpretation_type == 2)
353                     return "row_interleaved_rl";
354                 else
355                     return "row_interleaved_lr";
356             case SEI_FPA_TYPE_SIDE_BY_SIDE:
357                 if (h->sei_fpa.content_interpretation_type == 2)
358                     return "right_left";
359                 else
360                     return "left_right";
361             case SEI_FPA_TYPE_TOP_BOTTOM:
362                 if (h->sei_fpa.content_interpretation_type == 2)
363                     return "bottom_top";
364                 else
365                     return "top_bottom";
366             case SEI_FPA_TYPE_INTERLEAVE_TEMPORAL:
367                 if (h->sei_fpa.content_interpretation_type == 2)
368                     return "block_rl";
369                 else
370                     return "block_lr";
371             case SEI_FPA_TYPE_2D:
372             default:
373                 return "mono";
374         }
375     } else if (h->sei_fpa.frame_packing_arrangement_cancel_flag == 1) {
376         return "mono";
377     } else {
378         return NULL;
379     }
380 }