FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/gxf.c
Date: 2024-04-24 18:52:15
Exec Total Coverage
Lines: 273 366 74.6%
Functions: 14 14 100.0%
Branches: 142 213 66.7%
Line Branch Exec Source
1 /*
2 * GXF demuxer.
3 * Copyright (c) 2006 Reimar Doeffinger
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 */
21
22 #include <inttypes.h>
23
24 #include "libavutil/channel_layout.h"
25 #include "libavutil/common.h"
26 #include "avformat.h"
27 #include "demux.h"
28 #include "internal.h"
29 #include "gxf.h"
30
31 struct gxf_stream_info {
32 int64_t first_field;
33 int64_t last_field;
34 AVRational frames_per_second;
35 int32_t fields_per_frame;
36 int64_t track_aux_data;
37 };
38
39 /**
40 * @brief parse gxf timecode and add it to metadata
41 */
42 12 static int add_timecode_metadata(AVDictionary **pm, const char *key, uint32_t timecode, int fields_per_frame)
43 {
44 char tmp[128];
45 12 int field = timecode & 0xff;
46
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 12 int frame = fields_per_frame ? field / fields_per_frame : field;
47 12 int second = (timecode >> 8) & 0xff;
48 12 int minute = (timecode >> 16) & 0xff;
49 12 int hour = (timecode >> 24) & 0x1f;
50 12 int drop = (timecode >> 29) & 1;
51 // bit 30: color_frame, unused
52 // ignore invalid time code
53
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 12 if (timecode >> 31)
54 ✗ return 0;
55
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 12 snprintf(tmp, sizeof(tmp), "%02d:%02d:%02d%c%02d",
56 hour, minute, second, drop ? ';' : ':', frame);
57 12 return av_dict_set(pm, key, tmp, 0);
58 }
59
60 /**
61 * @brief parses a packet header, extracting type and length
62 * @param pb AVIOContext to read header from
63 * @param type detected packet type is stored here
64 * @param length detected packet length, excluding header is stored here
65 * @return 0 if header not found or contains invalid data, 1 otherwise
66 */
67 368 static int parse_packet_header(AVIOContext *pb, GXFPktType *type, int *length) {
68
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 368 if (avio_rb32(pb))
69 ✗ return 0;
70
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 368 if (avio_r8(pb) != 1)
71 4 return 0;
72 364 *type = avio_r8(pb);
73 364 *length = avio_rb32(pb);
74
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 364 if ((*length >> 24) || *length < 16)
75 16 return 0;
76 348 *length -= 16;
77
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 348 if (avio_rb32(pb))
78 31 return 0;
79
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 317 if (avio_r8(pb) != 0xe1)
80 ✗ return 0;
81
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 317 if (avio_r8(pb) != 0xe2)
82 ✗ return 0;
83 317 return 1;
84 }
85
86 /**
87 * @brief check if file starts with a PKT_MAP header
88 */
89 7127 static int gxf_probe(const AVProbeData *p) {
90 static const uint8_t startcode[] = {0, 0, 0, 0, 1, 0xbc}; // start with map packet
91 static const uint8_t endcode[] = {0, 0, 0, 0, 0xe1, 0xe2};
92
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 7127 if (!memcmp(p->buf, startcode, sizeof(startcode)) &&
93
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 4 !memcmp(&p->buf[16 - sizeof(endcode)], endcode, sizeof(endcode)))
94 4 return AVPROBE_SCORE_MAX;
95 7123 return 0;
96 }
97
98 /**
99 * @brief gets the stream index for the track with the specified id, creates new
100 * stream if not found
101 * @param id id of stream to find / add
102 * @param format stream format identifier
103 */
104 151 static int get_sindex(AVFormatContext *s, int id, int format) {
105 int i;
106 151 AVStream *st = NULL;
107 FFStream *sti;
108 151 i = ff_find_stream_index(s, id);
109
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 151 if (i >= 0)
110 139 return i;
111 12 st = avformat_new_stream(s, NULL);
112
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 12 if (!st)
113 ✗ return AVERROR(ENOMEM);
114 12 sti = ffstream(st);
115 12 st->id = id;
116
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 12 switch (format) {
117 ✗ case 3:
118 case 4:
119 ✗ st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
120 ✗ st->codecpar->codec_id = AV_CODEC_ID_MJPEG;
121 ✗ break;
122 ✗ case 13:
123 case 14:
124 case 15:
125 case 16:
126 case 25:
127 ✗ st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
128 ✗ st->codecpar->codec_id = AV_CODEC_ID_DVVIDEO;
129 ✗ break;
130 4 case 11:
131 case 12:
132 case 20:
133 4 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
134 4 st->codecpar->codec_id = AV_CODEC_ID_MPEG2VIDEO;
135 4 sti->need_parsing = AVSTREAM_PARSE_HEADERS; //get keyframe flag etc.
136 4 break;
137 ✗ case 22:
138 case 23:
139 ✗ st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
140 ✗ st->codecpar->codec_id = AV_CODEC_ID_MPEG1VIDEO;
141 ✗ sti->need_parsing = AVSTREAM_PARSE_HEADERS; //get keyframe flag etc.
142 ✗ break;
143 ✗ case 9:
144 ✗ st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
145 ✗ st->codecpar->codec_id = AV_CODEC_ID_PCM_S24LE;
146 ✗ st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
147 ✗ st->codecpar->sample_rate = 48000;
148 ✗ st->codecpar->bit_rate = 3 * 1 * 48000 * 8;
149 ✗ st->codecpar->block_align = 3 * 1;
150 ✗ st->codecpar->bits_per_coded_sample = 24;
151 ✗ break;
152 4 case 10:
153 4 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
154 4 st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
155 4 st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
156 4 st->codecpar->sample_rate = 48000;
157 4 st->codecpar->bit_rate = 2 * 1 * 48000 * 8;
158 4 st->codecpar->block_align = 2 * 1;
159 4 st->codecpar->bits_per_coded_sample = 16;
160 4 break;
161 ✗ case 17:
162 ✗ st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
163 ✗ st->codecpar->codec_id = AV_CODEC_ID_AC3;
164 ✗ st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
165 ✗ st->codecpar->sample_rate = 48000;
166 ✗ break;
167 ✗ case 26: /* AVCi50 / AVCi100 (AVC Intra) */
168 case 29: /* AVCHD */
169 ✗ st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
170 ✗ st->codecpar->codec_id = AV_CODEC_ID_H264;
171 ✗ sti->need_parsing = AVSTREAM_PARSE_HEADERS;
172 ✗ break;
173 // timecode tracks:
174 4 case 7:
175 case 8:
176 case 24:
177 4 st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
178 4 st->codecpar->codec_id = AV_CODEC_ID_NONE;
179 4 break;
180 ✗ case 30:
181 ✗ st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
182 ✗ st->codecpar->codec_id = AV_CODEC_ID_DNXHD;
183 ✗ break;
184 ✗ default:
185 ✗ st->codecpar->codec_type = AVMEDIA_TYPE_UNKNOWN;
186 ✗ st->codecpar->codec_id = AV_CODEC_ID_NONE;
187 ✗ break;
188 }
189 12 return s->nb_streams - 1;
190 }
191
192 /**
193 * @brief filters out interesting tags from material information.
194 * @param len length of tag section, will be adjusted to contain remaining bytes
195 * @param si struct to store collected information into
196 */
197 4 static void gxf_material_tags(AVIOContext *pb, int *len, struct gxf_stream_info *si) {
198 4 si->first_field = AV_NOPTS_VALUE;
199 4 si->last_field = AV_NOPTS_VALUE;
200
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 28 while (*len >= 2) {
201 24 GXFMatTag tag = avio_r8(pb);
202 24 int tlen = avio_r8(pb);
203 24 *len -= 2;
204
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 24 if (tlen > *len)
205 ✗ return;
206 24 *len -= tlen;
207
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 24 if (tlen == 4) {
208 20 uint32_t value = avio_rb32(pb);
209
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 20 if (tag == MAT_FIRST_FIELD)
210 4 si->first_field = value;
211
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 16 else if (tag == MAT_LAST_FIELD)
212 4 si->last_field = value;
213 } else
214 4 avio_skip(pb, tlen);
215 }
216 }
217
218 static const AVRational frame_rate_tab[] = {
219 { 60, 1},
220 {60000, 1001},
221 { 50, 1},
222 { 30, 1},
223 {30000, 1001},
224 { 25, 1},
225 { 24, 1},
226 {24000, 1001},
227 { 0, 0},
228 };
229
230 /**
231 * @brief convert fps tag value to AVRational fps
232 * @param fps fps value from tag
233 * @return fps as AVRational, or 0 / 0 if unknown
234 */
235 12 static AVRational fps_tag2avr(int32_t fps) {
236
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 12 if (fps < 1 || fps > 9) fps = 9;
237 12 return frame_rate_tab[fps - 1];
238 }
239
240 /**
241 * @brief convert UMF attributes flags to AVRational fps
242 * @param flags UMF flags to convert
243 * @return fps as AVRational, or 0 / 0 if unknown
244 */
245 4 static AVRational fps_umf2avr(uint32_t flags) {
246 static const AVRational map[] = {{50, 1}, {60000, 1001}, {24, 1},
247 {25, 1}, {30000, 1001}};
248 4 int idx = av_log2((flags & 0x7c0) >> 6);
249 4 return map[idx];
250 }
251
252 /**
253 * @brief filters out interesting tags from track information.
254 * @param len length of tag section, will be adjusted to contain remaining bytes
255 * @param si struct to store collected information into
256 */
257 12 static void gxf_track_tags(AVIOContext *pb, int *len, struct gxf_stream_info *si) {
258 12 si->frames_per_second = (AVRational){0, 0};
259 12 si->fields_per_frame = 0;
260 12 si->track_aux_data = 0x80000000;
261
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 84 while (*len >= 2) {
262 72 GXFTrackTag tag = avio_r8(pb);
263 72 int tlen = avio_r8(pb);
264 72 *len -= 2;
265
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 72 if (tlen > *len)
266 ✗ return;
267 72 *len -= tlen;
268
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 72 if (tlen == 4) {
269 48 uint32_t value = avio_rb32(pb);
270
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 48 if (tag == TRACK_FPS)
271 12 si->frames_per_second = fps_tag2avr(value);
272
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 36 else if (tag == TRACK_FPF && (value == 1 || value == 2))
273 8 si->fields_per_frame = value;
274
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 24 } else if (tlen == 8 && tag == TRACK_AUX)
275 8 si->track_aux_data = avio_rl64(pb);
276 else
277 16 avio_skip(pb, tlen);
278 }
279 }
280
281 /**
282 * @brief read index from FLT packet into stream 0 av_index
283 */
284 4 static void gxf_read_index(AVFormatContext *s, int pkt_len) {
285 4 AVIOContext *pb = s->pb;
286 AVStream *st;
287 uint32_t fields_per_map, map_cnt;
288 int i;
289
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 4 if (pkt_len < 8)
290 ✗ return;
291 4 fields_per_map = avio_rl32(pb);
292 4 map_cnt = avio_rl32(pb);
293 4 pkt_len -= 8;
294
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 4 if ((s->flags & AVFMT_FLAG_IGNIDX) || !s->streams) {
295 ✗ avio_skip(pb, pkt_len);
296 ✗ return;
297 }
298 4 st = s->streams[0];
299
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 4 if (map_cnt > 1000) {
300 ✗ av_log(s, AV_LOG_ERROR,
301 "too many index entries %"PRIu32" (%"PRIx32")\n",
302 map_cnt, map_cnt);
303 ✗ map_cnt = 1000;
304 }
305
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 4 if (pkt_len < 4 * map_cnt) {
306 ✗ av_log(s, AV_LOG_ERROR, "invalid index length\n");
307 ✗ avio_skip(pb, pkt_len);
308 ✗ return;
309 }
310 4 pkt_len -= 4 * map_cnt;
311 4 av_add_index_entry(st, 0, 0, 0, 0, 0);
312
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 214 for (i = 0; i < map_cnt; i++)
313 210 av_add_index_entry(st, (uint64_t)avio_rl32(pb) * 1024,
314 210 i * (uint64_t)fields_per_map + 1, 0, 0, 0);
315 4 avio_skip(pb, pkt_len);
316 }
317
318 4 static int gxf_header(AVFormatContext *s) {
319 4 AVIOContext *pb = s->pb;
320 GXFPktType pkt_type;
321 int map_len;
322 int len;
323 4 AVRational main_timebase = {0, 0};
324 4 struct gxf_stream_info *si = s->priv_data;
325 int i;
326
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 4 if (!parse_packet_header(pb, &pkt_type, &map_len) || pkt_type != PKT_MAP) {
327 ✗ av_log(s, AV_LOG_ERROR, "map packet not found\n");
328 ✗ return 0;
329 }
330 4 map_len -= 2;
331
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 4 if (avio_r8(pb) != 0x0e0 || avio_r8(pb) != 0xff) {
332 ✗ av_log(s, AV_LOG_ERROR, "unknown version or invalid map preamble\n");
333 ✗ return 0;
334 }
335 4 map_len -= 2;
336 4 len = avio_rb16(pb); // length of material data section
337
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 4 if (len > map_len) {
338 ✗ av_log(s, AV_LOG_ERROR, "material data longer than map data\n");
339 ✗ return 0;
340 }
341 4 map_len -= len;
342 4 gxf_material_tags(pb, &len, si);
343 4 avio_skip(pb, len);
344 4 map_len -= 2;
345 4 len = avio_rb16(pb); // length of track description
346
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 4 if (len > map_len) {
347 ✗ av_log(s, AV_LOG_ERROR, "track description longer than map data\n");
348 ✗ return 0;
349 }
350 4 map_len -= len;
351
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 16 while (len > 0) {
352 int track_type, track_id, track_len;
353 AVStream *st;
354 int idx;
355 12 len -= 4;
356 12 track_type = avio_r8(pb);
357 12 track_id = avio_r8(pb);
358 12 track_len = avio_rb16(pb);
359 12 len -= track_len;
360
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 12 if (!(track_type & 0x80)) {
361 ✗ av_log(s, AV_LOG_ERROR, "invalid track type %x\n", track_type);
362 ✗ continue;
363 }
364 12 track_type &= 0x7f;
365
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 12 if ((track_id & 0xc0) != 0xc0) {
366 ✗ av_log(s, AV_LOG_ERROR, "invalid track id %x\n", track_id);
367 ✗ continue;
368 }
369 12 track_id &= 0x3f;
370 12 gxf_track_tags(pb, &track_len, si);
371 // check for timecode tracks
372
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 12 if (track_type == 7 || track_type == 8 || track_type == 24) {
373 4 add_timecode_metadata(&s->metadata, "timecode",
374 4 si->track_aux_data & 0xffffffff,
375 si->fields_per_frame);
376
377 }
378 12 avio_skip(pb, track_len);
379
380 12 idx = get_sindex(s, track_id, track_type);
381
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 12 if (idx < 0) continue;
382 12 st = s->streams[idx];
383
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 12 if (!main_timebase.num || !main_timebase.den) {
384 4 main_timebase.num = si->frames_per_second.den;
385 4 main_timebase.den = si->frames_per_second.num * 2;
386 }
387 12 st->start_time = si->first_field;
388
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 12 if (si->first_field != AV_NOPTS_VALUE && si->last_field != AV_NOPTS_VALUE)
389 12 st->duration = si->last_field - si->first_field;
390 }
391
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 4 if (len < 0)
392 ✗ av_log(s, AV_LOG_ERROR, "invalid track description length specified\n");
393
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 4 if (map_len)
394 4 avio_skip(pb, map_len);
395
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 4 if (!parse_packet_header(pb, &pkt_type, &len)) {
396 ✗ av_log(s, AV_LOG_ERROR, "sync lost in header\n");
397 ✗ return -1;
398 }
399
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 4 if (pkt_type == PKT_FLT) {
400 4 gxf_read_index(s, len);
401
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 4 if (!parse_packet_header(pb, &pkt_type, &len)) {
402 ✗ av_log(s, AV_LOG_ERROR, "sync lost in header\n");
403 ✗ return -1;
404 }
405 }
406
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 4 if (pkt_type == PKT_UMF) {
407
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 4 if (len >= 0x39) {
408 AVRational fps;
409 4 len -= 0x39;
410 4 avio_skip(pb, 5); // preamble
411 4 avio_skip(pb, 0x30); // payload description
412 4 fps = fps_umf2avr(avio_rl32(pb));
413
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 4 if (!main_timebase.num || !main_timebase.den) {
414 ✗ av_log(s, AV_LOG_WARNING, "No FPS track tag, using UMF fps tag."
415 " This might give wrong results.\n");
416 // this may not always be correct, but simply the best we can get
417 ✗ main_timebase.num = fps.den;
418 ✗ main_timebase.den = fps.num * 2;
419 }
420
421
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 4 if (len >= 0x18) {
422 4 len -= 0x18;
423 4 avio_skip(pb, 0x10);
424 4 add_timecode_metadata(&s->metadata, "timecode_at_mark_in",
425 avio_rl32(pb), si->fields_per_frame);
426 4 add_timecode_metadata(&s->metadata, "timecode_at_mark_out",
427 avio_rl32(pb), si->fields_per_frame);
428 }
429 } else
430 ✗ av_log(s, AV_LOG_INFO, "UMF packet too short\n");
431 } else
432 ✗ av_log(s, AV_LOG_INFO, "UMF packet missing\n");
433 4 avio_skip(pb, len);
434 // set a fallback value, 60000/1001 is specified for audio-only files
435 // so use that regardless of why we do not know the video frame rate.
436
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 4 if (!main_timebase.num || !main_timebase.den)
437 ✗ main_timebase = (AVRational){1001, 60000};
438
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 16 for (i = 0; i < s->nb_streams; i++) {
439 12 AVStream *st = s->streams[i];
440 12 avpriv_set_pts_info(st, 32, main_timebase.num, main_timebase.den);
441 }
442 4 return 0;
443 }
444
445 #define READ_ONE() \
446 { \
447 if (!max_interval-- || avio_feof(pb)) \
448 goto out; \
449 tmp = tmp << 8 | avio_r8(pb); \
450 }
451
452 /**
453 * @brief resync the stream on the next media packet with specified properties
454 * @param max_interval how many bytes to search for matching packet at most
455 * @param track track id the media packet must belong to, -1 for any
456 * @param timestamp minimum timestamp (== field number) the packet must have, -1 for any
457 * @return timestamp of packet found
458 */
459 120 static int64_t gxf_resync_media(AVFormatContext *s, uint64_t max_interval, int track, int timestamp) {
460 uint32_t tmp;
461 uint64_t last_pos;
462 120 uint64_t last_found_pos = 0;
463 int cur_track;
464 120 int64_t cur_timestamp = AV_NOPTS_VALUE;
465 int len;
466 120 AVIOContext *pb = s->pb;
467 GXFPktType type;
468 120 tmp = avio_rb32(pb);
469 33700 start:
470
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 2274321 while (tmp)
471
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 2240590 READ_ONE();
472
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 33731 READ_ONE();
473
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 33731 if (tmp != 1)
474 33522 goto start;
475 209 last_pos = avio_tell(pb);
476
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 209 if (avio_seek(pb, -5, SEEK_CUR) < 0)
477 ✗ goto out;
478
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 209 if (!parse_packet_header(pb, &type, &len) || type != PKT_MEDIA) {
479
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 160 if (avio_seek(pb, last_pos, SEEK_SET) < 0)
480 ✗ goto out;
481 160 goto start;
482 }
483 49 avio_r8(pb);
484 49 cur_track = avio_r8(pb);
485 49 cur_timestamp = avio_rb32(pb);
486 49 last_found_pos = avio_tell(pb) - 16 - 6;
487
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 49 if ((track >= 0 && track != cur_track) || (timestamp >= 0 && timestamp > cur_timestamp)) {
488
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 18 if (avio_seek(pb, last_pos, SEEK_SET) >= 0)
489 18 goto start;
490 }
491 31 out:
492
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 120 if (last_found_pos)
493 43 avio_seek(pb, last_found_pos, SEEK_SET);
494 120 return cur_timestamp;
495 }
496
497 146 static int gxf_packet(AVFormatContext *s, AVPacket *pkt) {
498 146 AVIOContext *pb = s->pb;
499 GXFPktType pkt_type;
500 int pkt_len;
501 146 struct gxf_stream_info *si = s->priv_data;
502
503
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 150 while (!pb->eof_reached) {
504 AVStream *st;
505 int track_type, track_id, ret;
506 147 int field_nr, field_info, skip = 0;
507 int stream_index;
508
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 147 if (!parse_packet_header(pb, &pkt_type, &pkt_len)) {
509
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 4 if (!avio_feof(pb))
510 ✗ av_log(s, AV_LOG_ERROR, "sync lost\n");
511 4 return -1;
512 }
513
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 143 if (pkt_type == PKT_FLT) {
514 ✗ gxf_read_index(s, pkt_len);
515 ✗ continue;
516 }
517
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 143 if (pkt_type != PKT_MEDIA) {
518 4 avio_skip(pb, pkt_len);
519 4 continue;
520 }
521
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 139 if (pkt_len < 16) {
522 ✗ av_log(s, AV_LOG_ERROR, "invalid media packet length\n");
523 ✗ continue;
524 }
525 139 pkt_len -= 16;
526 139 track_type = avio_r8(pb);
527 139 track_id = avio_r8(pb);
528 139 stream_index = get_sindex(s, track_id, track_type);
529
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 139 if (stream_index < 0)
530 ✗ return stream_index;
531 139 st = s->streams[stream_index];
532 139 field_nr = avio_rb32(pb);
533 139 field_info = avio_rb32(pb);
534 139 avio_rb32(pb); // "timeline" field number
535 139 avio_r8(pb); // flags
536 139 avio_r8(pb); // reserved
537
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 139 if (st->codecpar->codec_id == AV_CODEC_ID_PCM_S24LE ||
538
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 139 st->codecpar->codec_id == AV_CODEC_ID_PCM_S16LE) {
539 16 int first = field_info >> 16;
540 16 int last = field_info & 0xffff; // last is exclusive
541 16 int bps = av_get_bits_per_sample(st->codecpar->codec_id)>>3;
542
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 16 if (first <= last && last*bps <= pkt_len) {
543 16 avio_skip(pb, first*bps);
544 16 skip = pkt_len - last*bps;
545 16 pkt_len = (last-first)*bps;
546 } else
547 ✗ av_log(s, AV_LOG_ERROR, "invalid first and last sample values\n");
548 }
549 139 ret = av_get_packet(pb, pkt, pkt_len);
550
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 139 if (skip)
551 ✗ avio_skip(pb, skip);
552 139 pkt->stream_index = stream_index;
553 139 pkt->dts = field_nr;
554
555 //set duration manually for DV or else lavf misdetects the frame rate
556
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 139 if (st->codecpar->codec_id == AV_CODEC_ID_DVVIDEO)
557 ✗ pkt->duration = si->fields_per_frame;
558
559 139 return ret;
560 }
561 3 return AVERROR_EOF;
562 }
563
564 26 static int gxf_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) {
565 26 int64_t res = 0;
566 uint64_t pos;
567 26 uint64_t maxlen = 100 * 1024 * 1024;
568 26 AVStream *st = s->streams[0];
569 26 FFStream *const sti = ffstream(st);
570 26 int64_t start_time = s->streams[stream_index]->start_time;
571 int64_t found;
572 int idx;
573
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 26 if (timestamp < start_time) timestamp = start_time;
574 26 idx = av_index_search_timestamp(st, timestamp - start_time,
575 AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
576
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 26 if (idx < 0)
577 ✗ return -1;
578 26 pos = sti->index_entries[idx].pos;
579
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 26 if (idx < sti->nb_index_entries - 2)
580 14 maxlen = sti->index_entries[idx + 2].pos - pos;
581 26 maxlen = FFMAX(maxlen, 200 * 1024);
582 26 res = avio_seek(s->pb, pos, SEEK_SET);
583
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 26 if (res < 0)
584 ✗ return res;
585 26 found = gxf_resync_media(s, maxlen, -1, timestamp);
586
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 26 if (FFABS(found - timestamp) > 4)
587 11 return -1;
588 15 return 0;
589 }
590
591 94 static int64_t gxf_read_timestamp(AVFormatContext *s, int stream_index,
592 int64_t *pos, int64_t pos_limit) {
593 94 AVIOContext *pb = s->pb;
594 int64_t res;
595
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 94 if (avio_seek(pb, *pos, SEEK_SET) < 0)
596 ✗ return AV_NOPTS_VALUE;
597 94 res = gxf_resync_media(s, pos_limit - *pos, -1, -1);
598 94 *pos = avio_tell(pb);
599 94 return res;
600 }
601
602 const FFInputFormat ff_gxf_demuxer = {
603 .p.name = "gxf",
604 .p.long_name = NULL_IF_CONFIG_SMALL("GXF (General eXchange Format)"),
605 .priv_data_size = sizeof(struct gxf_stream_info),
606 .read_probe = gxf_probe,
607 .read_header = gxf_header,
608 .read_packet = gxf_packet,
609 .read_seek = gxf_seek,
610 .read_timestamp = gxf_read_timestamp,
611 };
612