h264: parse frame packing arrangement SEI messages and save relevant stereo3d information
[libav.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 Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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 #include <assert.h>
34
35 static const uint8_t sei_num_clock_ts_table[9] = {
36 1, 1, 1, 2, 2, 3, 3, 2, 3
37 };
38
39 void ff_h264_reset_sei(H264Context *h)
40 {
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 h->sei_frame_packing_present = 0;
46 }
47
48 static int decode_picture_timing(H264Context *h)
49 {
50 if (h->sps.nal_hrd_parameters_present_flag ||
51 h->sps.vcl_hrd_parameters_present_flag) {
52 h->sei_cpb_removal_delay = get_bits(&h->gb,
53 h->sps.cpb_removal_delay_length);
54 h->sei_dpb_output_delay = get_bits(&h->gb,
55 h->sps.dpb_output_delay_length);
56 }
57 if (h->sps.pic_struct_present_flag) {
58 unsigned int i, num_clock_ts;
59
60 h->sei_pic_struct = get_bits(&h->gb, 4);
61 h->sei_ct_type = 0;
62
63 if (h->sei_pic_struct > SEI_PIC_STRUCT_FRAME_TRIPLING)
64 return AVERROR_INVALIDDATA;
65
66 num_clock_ts = sei_num_clock_ts_table[h->sei_pic_struct];
67
68 for (i = 0; i < num_clock_ts; i++) {
69 if (get_bits(&h->gb, 1)) { /* clock_timestamp_flag */
70 unsigned int full_timestamp_flag;
71
72 h->sei_ct_type |= 1 << get_bits(&h->gb, 2);
73 skip_bits(&h->gb, 1); /* nuit_field_based_flag */
74 skip_bits(&h->gb, 5); /* counting_type */
75 full_timestamp_flag = get_bits(&h->gb, 1);
76 skip_bits(&h->gb, 1); /* discontinuity_flag */
77 skip_bits(&h->gb, 1); /* cnt_dropped_flag */
78 skip_bits(&h->gb, 8); /* n_frames */
79 if (full_timestamp_flag) {
80 skip_bits(&h->gb, 6); /* seconds_value 0..59 */
81 skip_bits(&h->gb, 6); /* minutes_value 0..59 */
82 skip_bits(&h->gb, 5); /* hours_value 0..23 */
83 } else {
84 if (get_bits(&h->gb, 1)) { /* seconds_flag */
85 skip_bits(&h->gb, 6); /* seconds_value range 0..59 */
86 if (get_bits(&h->gb, 1)) { /* minutes_flag */
87 skip_bits(&h->gb, 6); /* minutes_value 0..59 */
88 if (get_bits(&h->gb, 1)) /* hours_flag */
89 skip_bits(&h->gb, 5); /* hours_value 0..23 */
90 }
91 }
92 }
93 if (h->sps.time_offset_length > 0)
94 skip_bits(&h->gb,
95 h->sps.time_offset_length); /* time_offset */
96 }
97 }
98
99 if (h->avctx->debug & FF_DEBUG_PICT_INFO)
100 av_log(h->avctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n",
101 h->sei_ct_type, h->sei_pic_struct);
102 }
103 return 0;
104 }
105
106 static int decode_unregistered_user_data(H264Context *h, int size)
107 {
108 uint8_t user_data[16 + 256];
109 int e, build, i;
110
111 if (size < 16)
112 return AVERROR_INVALIDDATA;
113
114 for (i = 0; i < sizeof(user_data) - 1 && i < size; i++)
115 user_data[i] = get_bits(&h->gb, 8);
116
117 user_data[i] = 0;
118 e = sscanf(user_data + 16, "x264 - core %d", &build);
119 if (e == 1 && build > 0)
120 h->x264_build = build;
121
122 if (h->avctx->debug & FF_DEBUG_BUGS)
123 av_log(h->avctx, AV_LOG_DEBUG, "user data:\"%s\"\n", user_data + 16);
124
125 for (; i < size; i++)
126 skip_bits(&h->gb, 8);
127
128 return 0;
129 }
130
131 static int decode_recovery_point(H264Context *h)
132 {
133 h->sei_recovery_frame_cnt = get_ue_golomb(&h->gb);
134
135 /* 1b exact_match_flag,
136 * 1b broken_link_flag,
137 * 2b changing_slice_group_idc */
138 skip_bits(&h->gb, 4);
139
140 return 0;
141 }
142
143 static int decode_buffering_period(H264Context *h)
144 {
145 unsigned int sps_id;
146 int sched_sel_idx;
147 SPS *sps;
148
149 sps_id = get_ue_golomb_31(&h->gb);
150 if (sps_id > 31 || !h->sps_buffers[sps_id]) {
151 av_log(h->avctx, AV_LOG_ERROR,
152 "non-existing SPS %d referenced in buffering period\n", sps_id);
153 return AVERROR_INVALIDDATA;
154 }
155 sps = h->sps_buffers[sps_id];
156
157 // NOTE: This is really so duplicated in the standard... See H.264, D.1.1
158 if (sps->nal_hrd_parameters_present_flag) {
159 for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
160 h->initial_cpb_removal_delay[sched_sel_idx] =
161 get_bits(&h->gb, sps->initial_cpb_removal_delay_length);
162 // initial_cpb_removal_delay_offset
163 skip_bits(&h->gb, sps->initial_cpb_removal_delay_length);
164 }
165 }
166 if (sps->vcl_hrd_parameters_present_flag) {
167 for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
168 h->initial_cpb_removal_delay[sched_sel_idx] =
169 get_bits(&h->gb, sps->initial_cpb_removal_delay_length);
170 // initial_cpb_removal_delay_offset
171 skip_bits(&h->gb, sps->initial_cpb_removal_delay_length);
172 }
173 }
174
175 h->sei_buffering_period_present = 1;
176 return 0;
177 }
178
179 static int decode_frame_packing_arrangement(H264Context *h)
180 {
181 int cancel;
182 int quincunx = 0;
183 int content = -1;
184 int type = -1;
185
186 get_ue_golomb(&h->gb); // frame_packing_arrangement_id
187 cancel = get_bits1(&h->gb); // frame_packing_arrangement_cancel_flag
188 if (cancel == 0) {
189 type = get_bits(&h->gb, 7); // frame_packing_arrangement_type
190 quincunx = get_bits1(&h->gb); // quincunx_sampling_flag
191 content = get_bits(&h->gb, 6); // content_interpretation_type
192
193 // the following skips: spatial_flipping_flag, frame0_flipped_flag,
194 // field_views_flag, current_frame_is_frame0_flag,
195 // frame0_self_contained_flag, frame1_self_contained_flag
196 skip_bits(&h->gb, 6);
197
198 if (quincunx == 0 && type != 5)
199 skip_bits(&h->gb, 16); // frame[01]_grid_position_[xy]
200 skip_bits(&h->gb, 8); // frame_packing_arrangement_reserved_byte
201 get_ue_golomb(&h->gb); // frame_packing_arrangement_repetition_period
202 }
203 skip_bits1(&h->gb); // frame_packing_arrangement_extension_flag
204
205 h->sei_frame_packing_present = (cancel == 0);
206 h->frame_packing_arrangement_type = type;
207 h->content_interpretation_type = content;
208 h->quincunx_subsampling = quincunx;
209
210 return 0;
211 }
212
213 int ff_h264_decode_sei(H264Context *h)
214 {
215 while (get_bits_left(&h->gb) > 16) {
216 int size = 0;
217 int type = 0;
218 int ret = 0;
219
220 do
221 type += show_bits(&h->gb, 8);
222 while (get_bits(&h->gb, 8) == 255);
223
224 do
225 size += show_bits(&h->gb, 8);
226 while (get_bits(&h->gb, 8) == 255);
227
228 if (size > get_bits_left(&h->gb) / 8) {
229 av_log(h->avctx, AV_LOG_ERROR, "SEI type %d truncated at %d\n",
230 type, get_bits_left(&h->gb));
231 return AVERROR_INVALIDDATA;
232 }
233
234 switch (type) {
235 case SEI_TYPE_PIC_TIMING: // Picture timing SEI
236 ret = decode_picture_timing(h);
237 if (ret < 0)
238 return ret;
239 break;
240 case SEI_TYPE_USER_DATA_UNREGISTERED:
241 ret = decode_unregistered_user_data(h, size);
242 if (ret < 0)
243 return ret;
244 break;
245 case SEI_TYPE_RECOVERY_POINT:
246 ret = decode_recovery_point(h);
247 if (ret < 0)
248 return ret;
249 break;
250 case SEI_BUFFERING_PERIOD:
251 ret = decode_buffering_period(h);
252 if (ret < 0)
253 return ret;
254 break;
255 case SEI_TYPE_FRAME_PACKING:
256 ret = decode_frame_packing_arrangement(h);
257 if (ret < 0)
258 return ret;
259 break;
260 default:
261 av_log(h->avctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);
262 skip_bits(&h->gb, 8 * size);
263 }
264
265 // FIXME check bits here
266 align_get_bits(&h->gb);
267 }
268
269 return 0;
270 }