pixdesc: K&R formatting cosmetics
[libav.git] / libavcodec / h264_sei.c
CommitLineData
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1/*
2 * H.26L/H.264/AVC/JVT/14496-10/... sei decoding
3 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
4 *
2912e87a 5 * This file is part of Libav.
9c095463 6 *
2912e87a 7 * Libav is free software; you can redistribute it and/or
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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 *
2912e87a 12 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 18 * License along with Libav; if not, write to the Free Software
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19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22/**
ba87f080 23 * @file
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24 * H.264 / AVC / MPEG4 part10 sei decoding.
25 * @author Michael Niedermayer <michaelni@gmx.at>
26 */
27
9c095463 28#include "avcodec.h"
9c095463 29#include "golomb.h"
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30#include "h264.h"
31#include "internal.h"
9c095463 32
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33static const uint8_t sei_num_clock_ts_table[9] = {
34 1, 1, 1, 2, 2, 3, 3, 2, 3
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35};
36
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37void ff_h264_reset_sei(H264Context *h)
38{
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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;
5b10ef72 43 h->sei_frame_packing_present = 0;
18e3d61e 44 h->sei_display_orientation_present = 0;
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45}
46
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47static int decode_picture_timing(H264Context *h)
48{
49 if (h->sps.nal_hrd_parameters_present_flag ||
50 h->sps.vcl_hrd_parameters_present_flag) {
51 h->sei_cpb_removal_delay = get_bits(&h->gb,
52 h->sps.cpb_removal_delay_length);
53 h->sei_dpb_output_delay = get_bits(&h->gb,
54 h->sps.dpb_output_delay_length);
9c095463 55 }
b1841217 56 if (h->sps.pic_struct_present_flag) {
9c095463 57 unsigned int i, num_clock_ts;
b1841217 58
2c541554 59 h->sei_pic_struct = get_bits(&h->gb, 4);
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60 h->sei_ct_type = 0;
61
62 if (h->sei_pic_struct > SEI_PIC_STRUCT_FRAME_TRIPLING)
0d8b943d 63 return AVERROR_INVALIDDATA;
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64
65 num_clock_ts = sei_num_clock_ts_table[h->sei_pic_struct];
66
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67 for (i = 0; i < num_clock_ts; i++) {
68 if (get_bits(&h->gb, 1)) { /* clock_timestamp_flag */
9c095463 69 unsigned int full_timestamp_flag;
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70
71 h->sei_ct_type |= 1 << get_bits(&h->gb, 2);
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72 skip_bits(&h->gb, 1); /* nuit_field_based_flag */
73 skip_bits(&h->gb, 5); /* counting_type */
74 full_timestamp_flag = get_bits(&h->gb, 1);
75 skip_bits(&h->gb, 1); /* discontinuity_flag */
76 skip_bits(&h->gb, 1); /* cnt_dropped_flag */
77 skip_bits(&h->gb, 8); /* n_frames */
b1841217 78 if (full_timestamp_flag) {
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79 skip_bits(&h->gb, 6); /* seconds_value 0..59 */
80 skip_bits(&h->gb, 6); /* minutes_value 0..59 */
81 skip_bits(&h->gb, 5); /* hours_value 0..23 */
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82 } else {
83 if (get_bits(&h->gb, 1)) { /* seconds_flag */
2c541554 84 skip_bits(&h->gb, 6); /* seconds_value range 0..59 */
b1841217 85 if (get_bits(&h->gb, 1)) { /* minutes_flag */
2c541554 86 skip_bits(&h->gb, 6); /* minutes_value 0..59 */
b1841217 87 if (get_bits(&h->gb, 1)) /* hours_flag */
2c541554 88 skip_bits(&h->gb, 5); /* hours_value 0..23 */
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89 }
90 }
91 }
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92 if (h->sps.time_offset_length > 0)
93 skip_bits(&h->gb,
94 h->sps.time_offset_length); /* time_offset */
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95 }
96 }
97
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98 if (h->avctx->debug & FF_DEBUG_PICT_INFO)
99 av_log(h->avctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n",
100 h->sei_ct_type, h->sei_pic_struct);
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101 }
102 return 0;
103}
104
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105static int decode_unregistered_user_data(H264Context *h, int size)
106{
107 uint8_t user_data[16 + 256];
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108 int e, build, i;
109
b1841217 110 if (size < 16)
0d8b943d 111 return AVERROR_INVALIDDATA;
9c095463 112
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113 for (i = 0; i < sizeof(user_data) - 1 && i < size; i++)
114 user_data[i] = get_bits(&h->gb, 8);
9c095463 115
b1841217 116 user_data[i] = 0;
4c7fd58f 117 e = sscanf(user_data + 16, "x264 - core %d", &build);
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118 if (e == 1 && build > 0)
119 h->x264_build = build;
9c095463 120
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121 if (h->avctx->debug & FF_DEBUG_BUGS)
122 av_log(h->avctx, AV_LOG_DEBUG, "user data:\"%s\"\n", user_data + 16);
9c095463 123
b1841217 124 for (; i < size; i++)
2c541554 125 skip_bits(&h->gb, 8);
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126
127 return 0;
128}
129
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130static int decode_recovery_point(H264Context *h)
131{
2c541554 132 h->sei_recovery_frame_cnt = get_ue_golomb(&h->gb);
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133
134 /* 1b exact_match_flag,
135 * 1b broken_link_flag,
136 * 2b changing_slice_group_idc */
137 skip_bits(&h->gb, 4);
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138
139 return 0;
140}
141
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142static int decode_buffering_period(H264Context *h)
143{
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144 unsigned int sps_id;
145 int sched_sel_idx;
146 SPS *sps;
147
2c541554 148 sps_id = get_ue_golomb_31(&h->gb);
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149 if (sps_id > 31 || !h->sps_buffers[sps_id]) {
150 av_log(h->avctx, AV_LOG_ERROR,
151 "non-existing SPS %d referenced in buffering period\n", sps_id);
0d8b943d 152 return AVERROR_INVALIDDATA;
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153 }
154 sps = h->sps_buffers[sps_id];
155
156 // NOTE: This is really so duplicated in the standard... See H.264, D.1.1
157 if (sps->nal_hrd_parameters_present_flag) {
158 for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
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159 h->initial_cpb_removal_delay[sched_sel_idx] =
160 get_bits(&h->gb, sps->initial_cpb_removal_delay_length);
161 // initial_cpb_removal_delay_offset
162 skip_bits(&h->gb, sps->initial_cpb_removal_delay_length);
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163 }
164 }
165 if (sps->vcl_hrd_parameters_present_flag) {
166 for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
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167 h->initial_cpb_removal_delay[sched_sel_idx] =
168 get_bits(&h->gb, sps->initial_cpb_removal_delay_length);
169 // initial_cpb_removal_delay_offset
170 skip_bits(&h->gb, sps->initial_cpb_removal_delay_length);
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171 }
172 }
173
174 h->sei_buffering_period_present = 1;
175 return 0;
176}
177
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178static int decode_frame_packing_arrangement(H264Context *h)
179{
5b10ef72 180 get_ue_golomb(&h->gb); // frame_packing_arrangement_id
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181 h->sei_frame_packing_present = !get_bits1(&h->gb);
182
183 if (h->sei_frame_packing_present) {
184 h->frame_packing_arrangement_type = get_bits(&h->gb, 7);
185 h->quincunx_subsampling = get_bits1(&h->gb);
186 h->content_interpretation_type = get_bits(&h->gb, 6);
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187
188 // the following skips: spatial_flipping_flag, frame0_flipped_flag,
189 // field_views_flag, current_frame_is_frame0_flag,
190 // frame0_self_contained_flag, frame1_self_contained_flag
191 skip_bits(&h->gb, 6);
192
3d9fc21e 193 if (!h->quincunx_subsampling && h->frame_packing_arrangement_type != 5)
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194 skip_bits(&h->gb, 16); // frame[01]_grid_position_[xy]
195 skip_bits(&h->gb, 8); // frame_packing_arrangement_reserved_byte
196 get_ue_golomb(&h->gb); // frame_packing_arrangement_repetition_period
197 }
198 skip_bits1(&h->gb); // frame_packing_arrangement_extension_flag
199
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200 return 0;
201}
202
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203static int decode_display_orientation(H264Context *h)
204{
205 h->sei_display_orientation_present = !get_bits1(&h->gb);
206
207 if (h->sei_display_orientation_present) {
208 h->sei_hflip = get_bits1(&h->gb); // hor_flip
209 h->sei_vflip = get_bits1(&h->gb); // ver_flip
210
211 h->sei_anticlockwise_rotation = get_bits(&h->gb, 16);
212 get_ue_golomb(&h->gb); // display_orientation_repetition_period
213 skip_bits1(&h->gb); // display_orientation_extension_flag
214 }
215
216 return 0;
217}
218
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219int ff_h264_decode_sei(H264Context *h)
220{
2c541554 221 while (get_bits_left(&h->gb) > 16) {
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222 int size = 0;
223 int type = 0;
0d8b943d 224 int ret = 0;
9c095463 225
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226 do
227 type += show_bits(&h->gb, 8);
228 while (get_bits(&h->gb, 8) == 255);
9c095463 229
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230 do
231 size += show_bits(&h->gb, 8);
232 while (get_bits(&h->gb, 8) == 255);
9c095463 233
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234 if (size > get_bits_left(&h->gb) / 8) {
235 av_log(h->avctx, AV_LOG_ERROR, "SEI type %d truncated at %d\n",
236 type, get_bits_left(&h->gb));
237 return AVERROR_INVALIDDATA;
238 }
239
b1841217 240 switch (type) {
9c095463 241 case SEI_TYPE_PIC_TIMING: // Picture timing SEI
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242 ret = decode_picture_timing(h);
243 if (ret < 0)
244 return ret;
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245 break;
246 case SEI_TYPE_USER_DATA_UNREGISTERED:
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247 ret = decode_unregistered_user_data(h, size);
248 if (ret < 0)
249 return ret;
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250 break;
251 case SEI_TYPE_RECOVERY_POINT:
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252 ret = decode_recovery_point(h);
253 if (ret < 0)
254 return ret;
9c095463 255 break;
304e916a 256 case SEI_TYPE_BUFFERING_PERIOD:
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257 ret = decode_buffering_period(h);
258 if (ret < 0)
259 return ret;
9c095463 260 break;
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261 case SEI_TYPE_FRAME_PACKING:
262 ret = decode_frame_packing_arrangement(h);
263 if (ret < 0)
264 return ret;
265 break;
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266 case SEI_TYPE_DISPLAY_ORIENTATION:
267 ret = decode_display_orientation(h);
268 if (ret < 0)
269 return ret;
270 break;
9c095463 271 default:
26179964 272 av_log(h->avctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);
b1841217 273 skip_bits(&h->gb, 8 * size);
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274 }
275
b1841217 276 // FIXME check bits here
2c541554 277 align_get_bits(&h->gb);
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278 }
279
280 return 0;
281}