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>
35 static const uint8_t sei_num_clock_ts_table[9] = {
36 1, 1, 1, 2, 2, 3, 3, 2, 3
39 void ff_h264_reset_sei(H264Context *h)
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;
47 static int decode_picture_timing(H264Context *h)
52 for (i = 0; i<MAX_SPS_COUNT; i++)
53 if (!sps->log2_max_frame_num && h->sps_buffers[i])
54 sps = h->sps_buffers[i];
56 if (sps->nal_hrd_parameters_present_flag || sps->vcl_hrd_parameters_present_flag) {
57 h->sei_cpb_removal_delay = get_bits_long(&h->gb,
58 sps->cpb_removal_delay_length);
59 h->sei_dpb_output_delay = get_bits_long(&h->gb,
60 sps->dpb_output_delay_length);
62 if (sps->pic_struct_present_flag) {
63 unsigned int i, num_clock_ts;
65 h->sei_pic_struct = get_bits(&h->gb, 4);
68 if (h->sei_pic_struct > SEI_PIC_STRUCT_FRAME_TRIPLING)
69 return AVERROR_INVALIDDATA;
71 num_clock_ts = sei_num_clock_ts_table[h->sei_pic_struct];
73 for (i = 0; i < num_clock_ts; i++) {
74 if (get_bits(&h->gb, 1)) { /* clock_timestamp_flag */
75 unsigned int full_timestamp_flag;
77 h->sei_ct_type |= 1 << get_bits(&h->gb, 2);
78 skip_bits(&h->gb, 1); /* nuit_field_based_flag */
79 skip_bits(&h->gb, 5); /* counting_type */
80 full_timestamp_flag = get_bits(&h->gb, 1);
81 skip_bits(&h->gb, 1); /* discontinuity_flag */
82 skip_bits(&h->gb, 1); /* cnt_dropped_flag */
83 skip_bits(&h->gb, 8); /* n_frames */
84 if (full_timestamp_flag) {
85 skip_bits(&h->gb, 6); /* seconds_value 0..59 */
86 skip_bits(&h->gb, 6); /* minutes_value 0..59 */
87 skip_bits(&h->gb, 5); /* hours_value 0..23 */
89 if (get_bits(&h->gb, 1)) { /* seconds_flag */
90 skip_bits(&h->gb, 6); /* seconds_value range 0..59 */
91 if (get_bits(&h->gb, 1)) { /* minutes_flag */
92 skip_bits(&h->gb, 6); /* minutes_value 0..59 */
93 if (get_bits(&h->gb, 1)) /* hours_flag */
94 skip_bits(&h->gb, 5); /* hours_value 0..23 */
98 if (sps->time_offset_length > 0)
100 sps->time_offset_length); /* time_offset */
104 if (h->avctx->debug & FF_DEBUG_PICT_INFO)
105 av_log(h->avctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n",
106 h->sei_ct_type, h->sei_pic_struct);
111 static int decode_user_data_itu_t_t35(H264Context *h, int size)
113 uint32_t user_identifier;
114 int dtg_active_format;
120 skip_bits(&h->gb, 8); // country_code
121 skip_bits(&h->gb, 16); // provider_code
122 user_identifier = get_bits_long(&h->gb, 32);
124 switch (user_identifier) {
125 case 0x44544731: // "DTG1" - AFD_data
128 skip_bits(&h->gb, 1);
129 if (get_bits(&h->gb, 1)) {
130 skip_bits(&h->gb, 6);
133 skip_bits(&h->gb, 4);
134 dtg_active_format = get_bits(&h->gb, 4);
135 h->avctx->dtg_active_format = dtg_active_format;
137 skip_bits(&h->gb, 6);
141 skip_bits(&h->gb, size * 8);
148 static int decode_unregistered_user_data(H264Context *h, int size)
150 uint8_t user_data[16 + 256];
154 return AVERROR_INVALIDDATA;
156 for (i = 0; i < sizeof(user_data) - 1 && i < size; i++)
157 user_data[i] = get_bits(&h->gb, 8);
160 e = sscanf(user_data + 16, "x264 - core %d", &build);
161 if (e == 1 && build > 0)
162 h->x264_build = build;
163 if (e == 1 && build == 1 && !strncmp(user_data+16, "x264 - core 0000", 16))
166 if (h->avctx->debug & FF_DEBUG_BUGS)
167 av_log(h->avctx, AV_LOG_DEBUG, "user data:\"%s\"\n", user_data + 16);
169 for (; i < size; i++)
170 skip_bits(&h->gb, 8);
175 static int decode_recovery_point(H264Context *h)
177 h->sei_recovery_frame_cnt = get_ue_golomb(&h->gb);
179 /* 1b exact_match_flag,
180 * 1b broken_link_flag,
181 * 2b changing_slice_group_idc */
182 skip_bits(&h->gb, 4);
184 if (h->avctx->debug & FF_DEBUG_PICT_INFO)
185 av_log(h->avctx, AV_LOG_DEBUG, "sei_recovery_frame_cnt: %d\n", h->sei_recovery_frame_cnt);
190 static int decode_buffering_period(H264Context *h)
196 sps_id = get_ue_golomb_31(&h->gb);
197 if (sps_id > 31 || !h->sps_buffers[sps_id]) {
198 av_log(h->avctx, AV_LOG_ERROR,
199 "non-existing SPS %d referenced in buffering period\n", sps_id);
200 return AVERROR_INVALIDDATA;
202 sps = h->sps_buffers[sps_id];
204 // NOTE: This is really so duplicated in the standard... See H.264, D.1.1
205 if (sps->nal_hrd_parameters_present_flag) {
206 for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
207 h->initial_cpb_removal_delay[sched_sel_idx] =
208 get_bits_long(&h->gb, sps->initial_cpb_removal_delay_length);
209 // initial_cpb_removal_delay_offset
210 skip_bits(&h->gb, sps->initial_cpb_removal_delay_length);
213 if (sps->vcl_hrd_parameters_present_flag) {
214 for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
215 h->initial_cpb_removal_delay[sched_sel_idx] =
216 get_bits_long(&h->gb, sps->initial_cpb_removal_delay_length);
217 // initial_cpb_removal_delay_offset
218 skip_bits(&h->gb, sps->initial_cpb_removal_delay_length);
222 h->sei_buffering_period_present = 1;
226 static int decode_frame_packing(H264Context *h, int size) {
227 int bits = get_bits_left(&h->gb);
229 h->sei_fpa.frame_packing_arrangement_id = get_ue_golomb(&h->gb);
230 h->sei_fpa.frame_packing_arrangement_cancel_flag = get_bits(&h->gb, 1);
231 if (!h->sei_fpa.frame_packing_arrangement_cancel_flag) {
232 h->sei_fpa.frame_packing_arrangement_type = get_bits(&h->gb, 7);
233 h->sei_fpa.quincunx_sampling_flag = get_bits(&h->gb, 1);
234 h->sei_fpa.content_interpretation_type = get_bits(&h->gb, 6);
235 skip_bits(&h->gb, 1); /* spatial_flipping_flag */
236 skip_bits(&h->gb, 1); /* frame0_flipped_flag */
237 skip_bits(&h->gb, 1); /* field_views_flag */
238 skip_bits(&h->gb, 1); /* current_frame_is_frame0_flag */
239 skip_bits(&h->gb, 1); /* frame0_self_contained_flag */
240 skip_bits(&h->gb, 1); /* frame1_self_contained_flag */
241 if (!h->sei_fpa.quincunx_sampling_flag && h->sei_fpa.frame_packing_arrangement_type != 5) {
242 skip_bits(&h->gb, 4); /* frame0_grid_position_x */
243 skip_bits(&h->gb, 4); /* frame0_grid_position_y */
244 skip_bits(&h->gb, 4); /* frame1_grid_position_x */
245 skip_bits(&h->gb, 4); /* frame1_grid_position_y */
247 skip_bits(&h->gb, 8); /* frame_packing_arrangement_reserved_byte */
248 h->sei_fpa.frame_packing_arrangement_repetition_period = get_ue_golomb(&h->gb) /* frame_packing_arrangement_repetition_period */;
250 skip_bits(&h->gb, 1); /* frame_packing_arrangement_extension_flag */
252 if (h->avctx->debug & FF_DEBUG_PICT_INFO)
253 av_log(h->avctx, AV_LOG_DEBUG, "SEI FPA %d %d %d %d %d %d\n",
254 h->sei_fpa.frame_packing_arrangement_id,
255 h->sei_fpa.frame_packing_arrangement_cancel_flag,
256 h->sei_fpa.frame_packing_arrangement_type,
257 h->sei_fpa.quincunx_sampling_flag,
258 h->sei_fpa.content_interpretation_type,
259 h->sei_fpa.frame_packing_arrangement_repetition_period);
260 skip_bits_long(&h->gb, 8 * size - (bits - get_bits_left(&h->gb)));
264 int ff_h264_decode_sei(H264Context *h)
266 while (get_bits_left(&h->gb) > 16) {
273 if (get_bits_left(&h->gb) < 8)
274 return AVERROR_INVALIDDATA;
275 type += show_bits(&h->gb, 8);
276 } while (get_bits(&h->gb, 8) == 255);
279 if (get_bits_left(&h->gb) < 8)
280 return AVERROR_INVALIDDATA;
281 size += show_bits(&h->gb, 8);
282 } while (get_bits(&h->gb, 8) == 255);
284 if (h->avctx->debug&FF_DEBUG_STARTCODE)
285 av_log(h->avctx, AV_LOG_DEBUG, "SEI %d len:%d\n", type, size);
287 if (size > get_bits_left(&h->gb) / 8) {
288 av_log(h->avctx, AV_LOG_ERROR, "SEI truncated\n");
289 return AVERROR_INVALIDDATA;
291 next = get_bits_count(&h->gb) + 8 * size;
294 case SEI_TYPE_PIC_TIMING: // Picture timing SEI
295 ret = decode_picture_timing(h);
299 case SEI_TYPE_USER_DATA_ITU_T_T35:
300 if (decode_user_data_itu_t_t35(h, size) < 0)
303 case SEI_TYPE_USER_DATA_UNREGISTERED:
304 ret = decode_unregistered_user_data(h, size);
308 case SEI_TYPE_RECOVERY_POINT:
309 ret = decode_recovery_point(h);
313 case SEI_BUFFERING_PERIOD:
314 ret = decode_buffering_period(h);
318 case SEI_TYPE_FRAME_PACKING:
319 if (decode_frame_packing(h, size) < 0)
322 skip_bits_long(&h->gb, next - get_bits_count(&h->gb));
324 // FIXME check bits here
325 align_get_bits(&h->gb);
331 const char* ff_h264_sei_stereo_mode(H264Context *h)
333 if (h->sei_fpa.frame_packing_arrangement_cancel_flag == 0) {
334 switch (h->sei_fpa.frame_packing_arrangement_type) {
335 case SEI_FPA_TYPE_CHECKERBOARD:
336 if (h->sei_fpa.content_interpretation_type == 2)
337 return "checkerboard_rl";
339 return "checkerboard_lr";
340 case SEI_FPA_TYPE_INTERLEAVE_COLUMN:
341 if (h->sei_fpa.content_interpretation_type == 2)
342 return "col_interleaved_rl";
344 return "col_interleaved_lr";
345 case SEI_FPA_TYPE_INTERLEAVE_ROW:
346 if (h->sei_fpa.content_interpretation_type == 2)
347 return "row_interleaved_rl";
349 return "row_interleaved_lr";
350 case SEI_FPA_TYPE_SIDE_BY_SIDE:
351 if (h->sei_fpa.content_interpretation_type == 2)
355 case SEI_FPA_TYPE_TOP_BOTTOM:
356 if (h->sei_fpa.content_interpretation_type == 2)
360 case SEI_FPA_TYPE_INTERLEAVE_TEMPORAL:
361 if (h->sei_fpa.content_interpretation_type == 2)
365 case SEI_FPA_TYPE_2D:
369 } else if (h->sei_fpa.frame_packing_arrangement_cancel_flag == 1) {