2 * H.26L/H.264/AVC/JVT/14496-10/... sei decoding
3 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
5 * This file is part of FFmpeg.
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.
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.
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
24 * H.264 / AVC / MPEG4 part10 sei decoding.
25 * @author Michael Niedermayer <michaelni@gmx.at>
36 static const uint8_t sei_num_clock_ts_table[9] = {
37 1, 1, 1, 2, 2, 3, 3, 2, 3
40 void ff_h264_reset_sei(H264Context *h)
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;
48 static int decode_picture_timing(H264Context *h)
53 for (i = 0; i<MAX_SPS_COUNT; i++)
54 if (!sps->log2_max_frame_num && h->sps_buffers[i])
55 sps = h->sps_buffers[i];
57 if (sps->nal_hrd_parameters_present_flag || sps->vcl_hrd_parameters_present_flag) {
58 h->sei_cpb_removal_delay = get_bits_long(&h->gb,
59 sps->cpb_removal_delay_length);
60 h->sei_dpb_output_delay = get_bits_long(&h->gb,
61 sps->dpb_output_delay_length);
63 if (sps->pic_struct_present_flag) {
64 unsigned int i, num_clock_ts;
66 h->sei_pic_struct = get_bits(&h->gb, 4);
69 if (h->sei_pic_struct > SEI_PIC_STRUCT_FRAME_TRIPLING)
70 return AVERROR_INVALIDDATA;
72 num_clock_ts = sei_num_clock_ts_table[h->sei_pic_struct];
74 for (i = 0; i < num_clock_ts; i++) {
75 if (get_bits(&h->gb, 1)) { /* clock_timestamp_flag */
76 unsigned int full_timestamp_flag;
78 h->sei_ct_type |= 1 << get_bits(&h->gb, 2);
79 skip_bits(&h->gb, 1); /* nuit_field_based_flag */
80 skip_bits(&h->gb, 5); /* counting_type */
81 full_timestamp_flag = get_bits(&h->gb, 1);
82 skip_bits(&h->gb, 1); /* discontinuity_flag */
83 skip_bits(&h->gb, 1); /* cnt_dropped_flag */
84 skip_bits(&h->gb, 8); /* n_frames */
85 if (full_timestamp_flag) {
86 skip_bits(&h->gb, 6); /* seconds_value 0..59 */
87 skip_bits(&h->gb, 6); /* minutes_value 0..59 */
88 skip_bits(&h->gb, 5); /* hours_value 0..23 */
90 if (get_bits(&h->gb, 1)) { /* seconds_flag */
91 skip_bits(&h->gb, 6); /* seconds_value range 0..59 */
92 if (get_bits(&h->gb, 1)) { /* minutes_flag */
93 skip_bits(&h->gb, 6); /* minutes_value 0..59 */
94 if (get_bits(&h->gb, 1)) /* hours_flag */
95 skip_bits(&h->gb, 5); /* hours_value 0..23 */
99 if (sps->time_offset_length > 0)
101 sps->time_offset_length); /* time_offset */
105 if (h->avctx->debug & FF_DEBUG_PICT_INFO)
106 av_log(h->avctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n",
107 h->sei_ct_type, h->sei_pic_struct);
112 static int decode_user_data_itu_t_t35(H264Context *h, int size)
114 uint32_t user_identifier;
115 int dtg_active_format;
121 skip_bits(&h->gb, 8); // country_code
122 skip_bits(&h->gb, 16); // provider_code
123 user_identifier = get_bits_long(&h->gb, 32);
125 switch (user_identifier) {
126 case 0x44544731: // "DTG1" - AFD_data
129 skip_bits(&h->gb, 1);
130 if (get_bits(&h->gb, 1)) {
131 skip_bits(&h->gb, 6);
134 skip_bits(&h->gb, 4);
135 dtg_active_format = get_bits(&h->gb, 4);
136 h->avctx->dtg_active_format = dtg_active_format;
138 skip_bits(&h->gb, 6);
142 skip_bits(&h->gb, size * 8);
149 static int decode_unregistered_user_data(H264Context *h, int size)
151 uint8_t user_data[16 + 256];
155 return AVERROR_INVALIDDATA;
157 for (i = 0; i < sizeof(user_data) - 1 && i < size; i++)
158 user_data[i] = get_bits(&h->gb, 8);
161 e = sscanf(user_data + 16, "x264 - core %d", &build);
162 if (e == 1 && build > 0)
163 h->x264_build = build;
164 if (e == 1 && build == 1 && !strncmp(user_data+16, "x264 - core 0000", 16))
167 if (h->avctx->debug & FF_DEBUG_BUGS)
168 av_log(h->avctx, AV_LOG_DEBUG, "user data:\"%s\"\n", user_data + 16);
170 for (; i < size; i++)
171 skip_bits(&h->gb, 8);
176 static int decode_recovery_point(H264Context *h)
178 h->sei_recovery_frame_cnt = get_ue_golomb(&h->gb);
180 /* 1b exact_match_flag,
181 * 1b broken_link_flag,
182 * 2b changing_slice_group_idc */
183 skip_bits(&h->gb, 4);
185 if (h->avctx->debug & FF_DEBUG_PICT_INFO)
186 av_log(h->avctx, AV_LOG_DEBUG, "sei_recovery_frame_cnt: %d\n", h->sei_recovery_frame_cnt);
191 static int decode_buffering_period(H264Context *h)
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;
203 sps = h->sps_buffers[sps_id];
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);
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);
223 h->sei_buffering_period_present = 1;
227 static int decode_frame_packing(H264Context *h, int size) {
228 int bits = get_bits_left(&h->gb);
230 h->sei_fpa.frame_packing_arrangement_id = get_ue_golomb(&h->gb);
231 h->sei_fpa.frame_packing_arrangement_cancel_flag = get_bits(&h->gb, 1);
232 if (!h->sei_fpa.frame_packing_arrangement_cancel_flag) {
233 h->sei_fpa.frame_packing_arrangement_type = get_bits(&h->gb, 7);
234 h->sei_fpa.quincunx_sampling_flag = get_bits(&h->gb, 1);
235 h->sei_fpa.content_interpretation_type = get_bits(&h->gb, 6);
236 skip_bits(&h->gb, 1); /* spatial_flipping_flag */
237 skip_bits(&h->gb, 1); /* frame0_flipped_flag */
238 skip_bits(&h->gb, 1); /* field_views_flag */
239 skip_bits(&h->gb, 1); /* current_frame_is_frame0_flag */
240 skip_bits(&h->gb, 1); /* frame0_self_contained_flag */
241 skip_bits(&h->gb, 1); /* frame1_self_contained_flag */
242 if (!h->sei_fpa.quincunx_sampling_flag && h->sei_fpa.frame_packing_arrangement_type != 5) {
243 skip_bits(&h->gb, 4); /* frame0_grid_position_x */
244 skip_bits(&h->gb, 4); /* frame0_grid_position_y */
245 skip_bits(&h->gb, 4); /* frame1_grid_position_x */
246 skip_bits(&h->gb, 4); /* frame1_grid_position_y */
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 */;
251 skip_bits(&h->gb, 1); /* frame_packing_arrangement_extension_flag */
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 skip_bits_long(&h->gb, 8 * size - (bits - get_bits_left(&h->gb)));
265 int ff_h264_decode_sei(H264Context *h)
267 while (get_bits_left(&h->gb) > 16) {
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);
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);
285 if (h->avctx->debug&FF_DEBUG_STARTCODE)
286 av_log(h->avctx, AV_LOG_DEBUG, "SEI %d len:%d\n", type, size);
288 if (size > get_bits_left(&h->gb) / 8) {
289 av_log(h->avctx, AV_LOG_ERROR, "SEI truncated\n");
290 return AVERROR_INVALIDDATA;
292 next = get_bits_count(&h->gb) + 8 * size;
295 case SEI_TYPE_PIC_TIMING: // Picture timing SEI
296 ret = decode_picture_timing(h);
300 case SEI_TYPE_USER_DATA_ITU_T_T35:
301 if (decode_user_data_itu_t_t35(h, size) < 0)
304 case SEI_TYPE_USER_DATA_UNREGISTERED:
305 ret = decode_unregistered_user_data(h, size);
309 case SEI_TYPE_RECOVERY_POINT:
310 ret = decode_recovery_point(h);
314 case SEI_BUFFERING_PERIOD:
315 ret = decode_buffering_period(h);
319 case SEI_TYPE_FRAME_PACKING:
320 if (decode_frame_packing(h, size) < 0)
323 skip_bits_long(&h->gb, next - get_bits_count(&h->gb));
325 // FIXME check bits here
326 align_get_bits(&h->gb);
332 const char* ff_h264_sei_stereo_mode(H264Context *h)
334 if (h->sei_fpa.frame_packing_arrangement_cancel_flag == 0) {
335 switch (h->sei_fpa.frame_packing_arrangement_type) {
336 case SEI_FPA_TYPE_CHECKERBOARD:
337 if (h->sei_fpa.content_interpretation_type == 2)
338 return "checkerboard_rl";
340 return "checkerboard_lr";
341 case SEI_FPA_TYPE_INTERLEAVE_COLUMN:
342 if (h->sei_fpa.content_interpretation_type == 2)
343 return "col_interleaved_rl";
345 return "col_interleaved_lr";
346 case SEI_FPA_TYPE_INTERLEAVE_ROW:
347 if (h->sei_fpa.content_interpretation_type == 2)
348 return "row_interleaved_rl";
350 return "row_interleaved_lr";
351 case SEI_FPA_TYPE_SIDE_BY_SIDE:
352 if (h->sei_fpa.content_interpretation_type == 2)
356 case SEI_FPA_TYPE_TOP_BOTTOM:
357 if (h->sei_fpa.content_interpretation_type == 2)
361 case SEI_FPA_TYPE_INTERLEAVE_TEMPORAL:
362 if (h->sei_fpa.content_interpretation_type == 2)
366 case SEI_FPA_TYPE_2D:
370 } else if (h->sei_fpa.frame_packing_arrangement_cancel_flag == 1) {