h264_sei: 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
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
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36static const uint8_t sei_num_clock_ts_table[9] = {
37 1, 1, 1, 2, 2, 3, 3, 2, 3
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38};
39
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40void ff_h264_reset_sei(H264Context *h)
41{
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42 h->sei_recovery_frame_cnt = -1;
43 h->sei_dpb_output_delay = 0;
44 h->sei_cpb_removal_delay = -1;
45 h->sei_buffering_period_present = 0;
46}
47
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48static 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);
9c095463 56 }
b1841217 57 if (h->sps.pic_struct_present_flag) {
9c095463 58 unsigned int i, num_clock_ts;
b1841217 59
2c541554 60 h->sei_pic_struct = get_bits(&h->gb, 4);
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61 h->sei_ct_type = 0;
62
63 if (h->sei_pic_struct > SEI_PIC_STRUCT_FRAME_TRIPLING)
64 return -1;
65
66 num_clock_ts = sei_num_clock_ts_table[h->sei_pic_struct];
67
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68 for (i = 0; i < num_clock_ts; i++) {
69 if (get_bits(&h->gb, 1)) { /* clock_timestamp_flag */
9c095463 70 unsigned int full_timestamp_flag;
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71
72 h->sei_ct_type |= 1 << get_bits(&h->gb, 2);
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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 */
b1841217 79 if (full_timestamp_flag) {
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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 */
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83 } else {
84 if (get_bits(&h->gb, 1)) { /* seconds_flag */
2c541554 85 skip_bits(&h->gb, 6); /* seconds_value range 0..59 */
b1841217 86 if (get_bits(&h->gb, 1)) { /* minutes_flag */
2c541554 87 skip_bits(&h->gb, 6); /* minutes_value 0..59 */
b1841217 88 if (get_bits(&h->gb, 1)) /* hours_flag */
2c541554 89 skip_bits(&h->gb, 5); /* hours_value 0..23 */
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90 }
91 }
92 }
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93 if (h->sps.time_offset_length > 0)
94 skip_bits(&h->gb,
95 h->sps.time_offset_length); /* time_offset */
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96 }
97 }
98
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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);
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102 }
103 return 0;
104}
105
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106static int decode_unregistered_user_data(H264Context *h, int size)
107{
108 uint8_t user_data[16 + 256];
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109 int e, build, i;
110
b1841217 111 if (size < 16)
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112 return -1;
113
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114 for (i = 0; i < sizeof(user_data) - 1 && i < size; i++)
115 user_data[i] = get_bits(&h->gb, 8);
9c095463 116
b1841217 117 user_data[i] = 0;
4c7fd58f 118 e = sscanf(user_data + 16, "x264 - core %d", &build);
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119 if (e == 1 && build > 0)
120 h->x264_build = build;
9c095463 121
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122 if (h->avctx->debug & FF_DEBUG_BUGS)
123 av_log(h->avctx, AV_LOG_DEBUG, "user data:\"%s\"\n", user_data + 16);
9c095463 124
b1841217 125 for (; i < size; i++)
2c541554 126 skip_bits(&h->gb, 8);
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127
128 return 0;
129}
130
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131static int decode_recovery_point(H264Context *h)
132{
2c541554 133 h->sei_recovery_frame_cnt = get_ue_golomb(&h->gb);
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134
135 /* 1b exact_match_flag,
136 * 1b broken_link_flag,
137 * 2b changing_slice_group_idc */
138 skip_bits(&h->gb, 4);
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139
140 return 0;
141}
142
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143static int decode_buffering_period(H264Context *h)
144{
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145 unsigned int sps_id;
146 int sched_sel_idx;
147 SPS *sps;
148
2c541554 149 sps_id = get_ue_golomb_31(&h->gb);
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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);
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153 return -1;
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++) {
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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);
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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++) {
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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);
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172 }
173 }
174
175 h->sei_buffering_period_present = 1;
176 return 0;
177}
178
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179int ff_h264_decode_sei(H264Context *h)
180{
2c541554 181 while (get_bits_left(&h->gb) > 16) {
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182 int size = 0;
183 int type = 0;
9c095463 184
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185 do
186 type += show_bits(&h->gb, 8);
187 while (get_bits(&h->gb, 8) == 255);
9c095463 188
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189 do
190 size += show_bits(&h->gb, 8);
191 while (get_bits(&h->gb, 8) == 255);
9c095463 192
b1841217 193 switch (type) {
9c095463 194 case SEI_TYPE_PIC_TIMING: // Picture timing SEI
b1841217 195 if (decode_picture_timing(h) < 0)
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196 return -1;
197 break;
198 case SEI_TYPE_USER_DATA_UNREGISTERED:
b1841217 199 if (decode_unregistered_user_data(h, size) < 0)
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200 return -1;
201 break;
202 case SEI_TYPE_RECOVERY_POINT:
b1841217 203 if (decode_recovery_point(h) < 0)
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204 return -1;
205 break;
206 case SEI_BUFFERING_PERIOD:
b1841217 207 if (decode_buffering_period(h) < 0)
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208 return -1;
209 break;
210 default:
b1841217 211 skip_bits(&h->gb, 8 * size);
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212 }
213
b1841217 214 // FIXME check bits here
2c541554 215 align_get_bits(&h->gb);
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216 }
217
218 return 0;
219}