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view libavcodec/h264_sei.c @ 2:897f711a7157
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| author | Nina Engelhardt <nengel@mailbox.tu-berlin.de> |
|---|---|
| date | Tue, 25 Sep 2012 15:55:33 +0200 |
| parents | |
| children |
line source
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 */
22 /**
23 * @file
24 * H.264 / AVC / MPEG4 part10 sei decoding.
25 * @author Michael Niedermayer <michaelni@gmx.at>
26 */
28 #include "avcodec.h"
29 #include "h264_types.h"
30 #include "golomb.h"
32 //#undef NDEBUG
33 #include <assert.h>
35 static const uint8_t sei_num_clock_ts_table[9]={
36 1, 1, 1, 2, 2, 3, 3, 2, 3
37 };
39 void ff_h264_reset_sei(NalContext *n) {
40 n->sei_recovery_frame_cnt = -1;
41 n->sei_dpb_output_delay = 0;
42 n->sei_cpb_removal_delay = -1;
43 n->sei_buffering_period_present = 0;
44 }
46 static int decode_picture_timing(NalContext *n, GetBitContext *gb){
47 if(n->sps.nal_hrd_parameters_present_flag || n->sps.vcl_hrd_parameters_present_flag){
48 n->sei_cpb_removal_delay = get_bits(gb, n->sps.cpb_removal_delay_length);
49 n->sei_dpb_output_delay = get_bits(gb, n->sps.dpb_output_delay_length);
50 }
51 if(n->sps.pic_struct_present_flag){
52 unsigned int i, num_clock_ts;
53 n->sei_pic_struct = get_bits(gb, 4);
54 n->sei_ct_type = 0;
56 if (n->sei_pic_struct > SEI_PIC_STRUCT_FRAME_TRIPLING)
57 return -1;
59 num_clock_ts = sei_num_clock_ts_table[n->sei_pic_struct];
61 for (i = 0 ; i < num_clock_ts ; i++){
62 if(get_bits(gb, 1)){ /* clock_timestamp_flag */
63 unsigned int full_timestamp_flag;
64 n->sei_ct_type |= 1<<get_bits(gb, 2);
65 skip_bits(gb, 1); /* nuit_field_based_flag */
66 skip_bits(gb, 5); /* counting_type */
67 full_timestamp_flag = get_bits(gb, 1);
68 skip_bits(gb, 1); /* discontinuity_flag */
69 skip_bits(gb, 1); /* cnt_dropped_flag */
70 skip_bits(gb, 8); /* n_frames */
71 if(full_timestamp_flag){
72 skip_bits(gb, 6); /* seconds_value 0..59 */
73 skip_bits(gb, 6); /* minutes_value 0..59 */
74 skip_bits(gb, 5); /* hours_value 0..23 */
75 }else{
76 if(get_bits(gb, 1)){ /* seconds_flag */
77 skip_bits(gb, 6); /* seconds_value range 0..59 */
78 if(get_bits(gb, 1)){ /* minutes_flag */
79 skip_bits(gb, 6); /* minutes_value 0..59 */
80 if(get_bits(gb, 1)) /* hours_flag */
81 skip_bits(gb, 5); /* hours_value 0..23 */
82 }
83 }
84 }
85 if(n->sps.time_offset_length > 0)
86 skip_bits(gb, n->sps.time_offset_length); /* time_offset */
87 }
88 }
89 }
90 return 0;
91 }
93 static int decode_unregistered_user_data(GetBitContext *gb, int size){
94 char user_data[16+256];
95 int e, build, i;
97 if(size<16)
98 return -1;
100 for(i=0; i<(int) sizeof(user_data)-1 && i<size; i++){
101 user_data[i]= get_bits(gb, 8);
102 }
104 user_data[i]= 0;
105 e= sscanf(user_data+16, "x264 - core %d"/*%s - H.264/MPEG-4 AVC codec - Copyleft 2005 - http://www.videolan.org/x264.html*/, &build);
106 (void) e;
107 for(; i<size; i++)
108 skip_bits(gb, 8);
110 return 0;
111 }
113 static int decode_recovery_point(NalContext *n, GetBitContext *gb){
115 n->sei_recovery_frame_cnt = get_ue_golomb(gb);
116 skip_bits(gb, 4); /* 1b exact_match_flag, 1b broken_link_flag, 2b changing_slice_group_idc */
118 return 0;
119 }
121 static int decode_buffering_period(NalContext *n, GetBitContext *gb){
122 unsigned int sps_id;
123 int sched_sel_idx;
124 SPS *sps;
126 sps_id = get_ue_golomb_31(gb);
127 if(sps_id > 31 || !n->sps_buffers[sps_id]) {
128 av_log(AV_LOG_ERROR, "non-existing SPS %d referenced in buffering period\n", sps_id);
129 return -1;
130 }
131 sps = n->sps_buffers[sps_id];
133 // NOTE: This is really so duplicated in the standard... See H.264, D.1.1
134 if (sps->nal_hrd_parameters_present_flag) {
135 for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
136 n->initial_cpb_removal_delay[sched_sel_idx] = get_bits(gb, sps->initial_cpb_removal_delay_length);
137 skip_bits(gb, sps->initial_cpb_removal_delay_length); // initial_cpb_removal_delay_offset
138 }
139 }
140 if (sps->vcl_hrd_parameters_present_flag) {
141 for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
142 n->initial_cpb_removal_delay[sched_sel_idx] = get_bits(gb, sps->initial_cpb_removal_delay_length);
143 skip_bits(gb, sps->initial_cpb_removal_delay_length); // initial_cpb_removal_delay_offset
144 }
145 }
147 n->sei_buffering_period_present = 1;
148 return 0;
149 }
151 int ff_h264_decode_sei(NalContext *n, GetBitContext *gb){
152 while(get_bits_count(gb) + 16 < gb->size_in_bits){
153 int size, type;
155 type=0;
156 do{
157 type+= show_bits(gb, 8);
158 }while(get_bits(gb, 8) == 255);
160 size=0;
161 do{
162 size+= show_bits(gb, 8);
163 }while(get_bits(gb, 8) == 255);
165 switch(type){
166 case SEI_TYPE_PIC_TIMING: // Picture timing SEI
167 if(decode_picture_timing(n, gb) < 0)
168 return -1;
169 break;
170 case SEI_TYPE_USER_DATA_UNREGISTERED:
171 if(decode_unregistered_user_data(gb, size) < 0)
172 return -1;
173 break;
174 case SEI_TYPE_RECOVERY_POINT:
175 if(decode_recovery_point(n, gb) < 0)
176 return -1;
177 break;
178 case SEI_BUFFERING_PERIOD:
179 if(decode_buffering_period(n, gb) < 0)
180 return -1;
181 break;
182 default:
183 skip_bits(gb, 8*size);
184 }
186 //FIXME check bits here
187 align_get_bits(gb);
188 }
190 return 0;
191 }