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 "internal.h"
28 #include "gxf.h"
29 #include "libavcodec/mpeg12data.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 */
add_timecode_metadata(AVDictionary ** pm,const char * key,uint32_t timecode,int fields_per_frame)42 static int add_timecode_metadata(AVDictionary **pm, const char *key, uint32_t timecode, int fields_per_frame)
43 {
44 char tmp[128];
45 int field = timecode & 0xff;
46 int frame = fields_per_frame ? field / fields_per_frame : field;
47 int second = (timecode >> 8) & 0xff;
48 int minute = (timecode >> 16) & 0xff;
49 int hour = (timecode >> 24) & 0x1f;
50 int drop = (timecode >> 29) & 1;
51 // bit 30: color_frame, unused
52 // ignore invalid time code
53 if (timecode >> 31)
54 return 0;
55 snprintf(tmp, sizeof(tmp), "%02d:%02d:%02d%c%02d",
56 hour, minute, second, drop ? ';' : ':', frame);
57 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 */
parse_packet_header(AVIOContext * pb,GXFPktType * type,int * length)67 static int parse_packet_header(AVIOContext *pb, GXFPktType *type, int *length) {
68 if (avio_rb32(pb))
69 return 0;
70 if (avio_r8(pb) != 1)
71 return 0;
72 *type = avio_r8(pb);
73 *length = avio_rb32(pb);
74 if ((*length >> 24) || *length < 16)
75 return 0;
76 *length -= 16;
77 if (avio_rb32(pb))
78 return 0;
79 if (avio_r8(pb) != 0xe1)
80 return 0;
81 if (avio_r8(pb) != 0xe2)
82 return 0;
83 return 1;
84 }
85
86 /**
87 * @brief check if file starts with a PKT_MAP header
88 */
gxf_probe(const AVProbeData * p)89 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 if (!memcmp(p->buf, startcode, sizeof(startcode)) &&
93 !memcmp(&p->buf[16 - sizeof(endcode)], endcode, sizeof(endcode)))
94 return AVPROBE_SCORE_MAX;
95 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 */
get_sindex(AVFormatContext * s,int id,int format)104 static int get_sindex(AVFormatContext *s, int id, int format) {
105 int i;
106 AVStream *st = NULL;
107 i = ff_find_stream_index(s, id);
108 if (i >= 0)
109 return i;
110 st = avformat_new_stream(s, NULL);
111 if (!st)
112 return AVERROR(ENOMEM);
113 st->id = id;
114 switch (format) {
115 case 3:
116 case 4:
117 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
118 st->codecpar->codec_id = AV_CODEC_ID_MJPEG;
119 break;
120 case 13:
121 case 14:
122 case 15:
123 case 16:
124 case 25:
125 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
126 st->codecpar->codec_id = AV_CODEC_ID_DVVIDEO;
127 break;
128 case 11:
129 case 12:
130 case 20:
131 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
132 st->codecpar->codec_id = AV_CODEC_ID_MPEG2VIDEO;
133 st->need_parsing = AVSTREAM_PARSE_HEADERS; //get keyframe flag etc.
134 break;
135 case 22:
136 case 23:
137 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
138 st->codecpar->codec_id = AV_CODEC_ID_MPEG1VIDEO;
139 st->need_parsing = AVSTREAM_PARSE_HEADERS; //get keyframe flag etc.
140 break;
141 case 9:
142 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
143 st->codecpar->codec_id = AV_CODEC_ID_PCM_S24LE;
144 st->codecpar->channels = 1;
145 st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
146 st->codecpar->sample_rate = 48000;
147 st->codecpar->bit_rate = 3 * 1 * 48000 * 8;
148 st->codecpar->block_align = 3 * 1;
149 st->codecpar->bits_per_coded_sample = 24;
150 break;
151 case 10:
152 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
153 st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
154 st->codecpar->channels = 1;
155 st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
156 st->codecpar->sample_rate = 48000;
157 st->codecpar->bit_rate = 2 * 1 * 48000 * 8;
158 st->codecpar->block_align = 2 * 1;
159 st->codecpar->bits_per_coded_sample = 16;
160 break;
161 case 17:
162 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
163 st->codecpar->codec_id = AV_CODEC_ID_AC3;
164 st->codecpar->channels = 2;
165 st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
166 st->codecpar->sample_rate = 48000;
167 break;
168 case 26: /* AVCi50 / AVCi100 (AVC Intra) */
169 case 29: /* AVCHD */
170 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
171 st->codecpar->codec_id = AV_CODEC_ID_H264;
172 st->need_parsing = AVSTREAM_PARSE_HEADERS;
173 break;
174 // timecode tracks:
175 case 7:
176 case 8:
177 case 24:
178 st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
179 st->codecpar->codec_id = AV_CODEC_ID_NONE;
180 break;
181 case 30:
182 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
183 st->codecpar->codec_id = AV_CODEC_ID_DNXHD;
184 break;
185 default:
186 st->codecpar->codec_type = AVMEDIA_TYPE_UNKNOWN;
187 st->codecpar->codec_id = AV_CODEC_ID_NONE;
188 break;
189 }
190 return s->nb_streams - 1;
191 }
192
193 /**
194 * @brief filters out interesting tags from material information.
195 * @param len length of tag section, will be adjusted to contain remaining bytes
196 * @param si struct to store collected information into
197 */
gxf_material_tags(AVIOContext * pb,int * len,struct gxf_stream_info * si)198 static void gxf_material_tags(AVIOContext *pb, int *len, struct gxf_stream_info *si) {
199 si->first_field = AV_NOPTS_VALUE;
200 si->last_field = AV_NOPTS_VALUE;
201 while (*len >= 2) {
202 GXFMatTag tag = avio_r8(pb);
203 int tlen = avio_r8(pb);
204 *len -= 2;
205 if (tlen > *len)
206 return;
207 *len -= tlen;
208 if (tlen == 4) {
209 uint32_t value = avio_rb32(pb);
210 if (tag == MAT_FIRST_FIELD)
211 si->first_field = value;
212 else if (tag == MAT_LAST_FIELD)
213 si->last_field = value;
214 } else
215 avio_skip(pb, tlen);
216 }
217 }
218
219 static const AVRational frame_rate_tab[] = {
220 { 60, 1},
221 {60000, 1001},
222 { 50, 1},
223 { 30, 1},
224 {30000, 1001},
225 { 25, 1},
226 { 24, 1},
227 {24000, 1001},
228 { 0, 0},
229 };
230
231 /**
232 * @brief convert fps tag value to AVRational fps
233 * @param fps fps value from tag
234 * @return fps as AVRational, or 0 / 0 if unknown
235 */
fps_tag2avr(int32_t fps)236 static AVRational fps_tag2avr(int32_t fps) {
237 if (fps < 1 || fps > 9) fps = 9;
238 return frame_rate_tab[fps - 1];
239 }
240
241 /**
242 * @brief convert UMF attributes flags to AVRational fps
243 * @param flags UMF flags to convert
244 * @return fps as AVRational, or 0 / 0 if unknown
245 */
fps_umf2avr(uint32_t flags)246 static AVRational fps_umf2avr(uint32_t flags) {
247 static const AVRational map[] = {{50, 1}, {60000, 1001}, {24, 1},
248 {25, 1}, {30000, 1001}};
249 int idx = av_log2((flags & 0x7c0) >> 6);
250 return map[idx];
251 }
252
253 /**
254 * @brief filters out interesting tags from track information.
255 * @param len length of tag section, will be adjusted to contain remaining bytes
256 * @param si struct to store collected information into
257 */
gxf_track_tags(AVIOContext * pb,int * len,struct gxf_stream_info * si)258 static void gxf_track_tags(AVIOContext *pb, int *len, struct gxf_stream_info *si) {
259 si->frames_per_second = (AVRational){0, 0};
260 si->fields_per_frame = 0;
261 si->track_aux_data = 0x80000000;
262 while (*len >= 2) {
263 GXFTrackTag tag = avio_r8(pb);
264 int tlen = avio_r8(pb);
265 *len -= 2;
266 if (tlen > *len)
267 return;
268 *len -= tlen;
269 if (tlen == 4) {
270 uint32_t value = avio_rb32(pb);
271 if (tag == TRACK_FPS)
272 si->frames_per_second = fps_tag2avr(value);
273 else if (tag == TRACK_FPF && (value == 1 || value == 2))
274 si->fields_per_frame = value;
275 } else if (tlen == 8 && tag == TRACK_AUX)
276 si->track_aux_data = avio_rl64(pb);
277 else
278 avio_skip(pb, tlen);
279 }
280 }
281
282 /**
283 * @brief read index from FLT packet into stream 0 av_index
284 */
gxf_read_index(AVFormatContext * s,int pkt_len)285 static void gxf_read_index(AVFormatContext *s, int pkt_len) {
286 AVIOContext *pb = s->pb;
287 AVStream *st;
288 uint32_t fields_per_map, map_cnt;
289 int i;
290 if (pkt_len < 8)
291 return;
292 fields_per_map = avio_rl32(pb);
293 map_cnt = avio_rl32(pb);
294 pkt_len -= 8;
295 if ((s->flags & AVFMT_FLAG_IGNIDX) || !s->streams) {
296 avio_skip(pb, pkt_len);
297 return;
298 }
299 st = s->streams[0];
300 if (map_cnt > 1000) {
301 av_log(s, AV_LOG_ERROR,
302 "too many index entries %"PRIu32" (%"PRIx32")\n",
303 map_cnt, map_cnt);
304 map_cnt = 1000;
305 }
306 if (pkt_len < 4 * map_cnt) {
307 av_log(s, AV_LOG_ERROR, "invalid index length\n");
308 avio_skip(pb, pkt_len);
309 return;
310 }
311 pkt_len -= 4 * map_cnt;
312 av_add_index_entry(st, 0, 0, 0, 0, 0);
313 for (i = 0; i < map_cnt; i++)
314 av_add_index_entry(st, (uint64_t)avio_rl32(pb) * 1024,
315 i * (uint64_t)fields_per_map + 1, 0, 0, 0);
316 avio_skip(pb, pkt_len);
317 }
318
gxf_header(AVFormatContext * s)319 static int gxf_header(AVFormatContext *s) {
320 AVIOContext *pb = s->pb;
321 GXFPktType pkt_type;
322 int map_len;
323 int len;
324 AVRational main_timebase = {0, 0};
325 struct gxf_stream_info *si = s->priv_data;
326 int i;
327 if (!parse_packet_header(pb, &pkt_type, &map_len) || pkt_type != PKT_MAP) {
328 av_log(s, AV_LOG_ERROR, "map packet not found\n");
329 return 0;
330 }
331 map_len -= 2;
332 if (avio_r8(pb) != 0x0e0 || avio_r8(pb) != 0xff) {
333 av_log(s, AV_LOG_ERROR, "unknown version or invalid map preamble\n");
334 return 0;
335 }
336 map_len -= 2;
337 len = avio_rb16(pb); // length of material data section
338 if (len > map_len) {
339 av_log(s, AV_LOG_ERROR, "material data longer than map data\n");
340 return 0;
341 }
342 map_len -= len;
343 gxf_material_tags(pb, &len, si);
344 avio_skip(pb, len);
345 map_len -= 2;
346 len = avio_rb16(pb); // length of track description
347 if (len > map_len) {
348 av_log(s, AV_LOG_ERROR, "track description longer than map data\n");
349 return 0;
350 }
351 map_len -= len;
352 while (len > 0) {
353 int track_type, track_id, track_len;
354 AVStream *st;
355 int idx;
356 len -= 4;
357 track_type = avio_r8(pb);
358 track_id = avio_r8(pb);
359 track_len = avio_rb16(pb);
360 len -= track_len;
361 if (!(track_type & 0x80)) {
362 av_log(s, AV_LOG_ERROR, "invalid track type %x\n", track_type);
363 continue;
364 }
365 track_type &= 0x7f;
366 if ((track_id & 0xc0) != 0xc0) {
367 av_log(s, AV_LOG_ERROR, "invalid track id %x\n", track_id);
368 continue;
369 }
370 track_id &= 0x3f;
371 gxf_track_tags(pb, &track_len, si);
372 // check for timecode tracks
373 if (track_type == 7 || track_type == 8 || track_type == 24) {
374 add_timecode_metadata(&s->metadata, "timecode",
375 si->track_aux_data & 0xffffffff,
376 si->fields_per_frame);
377
378 }
379 avio_skip(pb, track_len);
380
381 idx = get_sindex(s, track_id, track_type);
382 if (idx < 0) continue;
383 st = s->streams[idx];
384 if (!main_timebase.num || !main_timebase.den) {
385 main_timebase.num = si->frames_per_second.den;
386 main_timebase.den = si->frames_per_second.num * 2;
387 }
388 st->start_time = si->first_field;
389 if (si->first_field != AV_NOPTS_VALUE && si->last_field != AV_NOPTS_VALUE)
390 st->duration = si->last_field - si->first_field;
391 }
392 if (len < 0)
393 av_log(s, AV_LOG_ERROR, "invalid track description length specified\n");
394 if (map_len)
395 avio_skip(pb, map_len);
396 if (!parse_packet_header(pb, &pkt_type, &len)) {
397 av_log(s, AV_LOG_ERROR, "sync lost in header\n");
398 return -1;
399 }
400 if (pkt_type == PKT_FLT) {
401 gxf_read_index(s, len);
402 if (!parse_packet_header(pb, &pkt_type, &len)) {
403 av_log(s, AV_LOG_ERROR, "sync lost in header\n");
404 return -1;
405 }
406 }
407 if (pkt_type == PKT_UMF) {
408 if (len >= 0x39) {
409 AVRational fps;
410 len -= 0x39;
411 avio_skip(pb, 5); // preamble
412 avio_skip(pb, 0x30); // payload description
413 fps = fps_umf2avr(avio_rl32(pb));
414 if (!main_timebase.num || !main_timebase.den) {
415 av_log(s, AV_LOG_WARNING, "No FPS track tag, using UMF fps tag."
416 " This might give wrong results.\n");
417 // this may not always be correct, but simply the best we can get
418 main_timebase.num = fps.den;
419 main_timebase.den = fps.num * 2;
420 }
421
422 if (len >= 0x18) {
423 len -= 0x18;
424 avio_skip(pb, 0x10);
425 add_timecode_metadata(&s->metadata, "timecode_at_mark_in",
426 avio_rl32(pb), si->fields_per_frame);
427 add_timecode_metadata(&s->metadata, "timecode_at_mark_out",
428 avio_rl32(pb), si->fields_per_frame);
429 }
430 } else
431 av_log(s, AV_LOG_INFO, "UMF packet too short\n");
432 } else
433 av_log(s, AV_LOG_INFO, "UMF packet missing\n");
434 avio_skip(pb, len);
435 // set a fallback value, 60000/1001 is specified for audio-only files
436 // so use that regardless of why we do not know the video frame rate.
437 if (!main_timebase.num || !main_timebase.den)
438 main_timebase = (AVRational){1001, 60000};
439 for (i = 0; i < s->nb_streams; i++) {
440 AVStream *st = s->streams[i];
441 avpriv_set_pts_info(st, 32, main_timebase.num, main_timebase.den);
442 }
443 return 0;
444 }
445
446 #define READ_ONE() \
447 { \
448 if (!max_interval-- || avio_feof(pb)) \
449 goto out; \
450 tmp = tmp << 8 | avio_r8(pb); \
451 }
452
453 /**
454 * @brief resync the stream on the next media packet with specified properties
455 * @param max_interval how many bytes to search for matching packet at most
456 * @param track track id the media packet must belong to, -1 for any
457 * @param timestamp minimum timestamp (== field number) the packet must have, -1 for any
458 * @return timestamp of packet found
459 */
gxf_resync_media(AVFormatContext * s,uint64_t max_interval,int track,int timestamp)460 static int64_t gxf_resync_media(AVFormatContext *s, uint64_t max_interval, int track, int timestamp) {
461 uint32_t tmp;
462 uint64_t last_pos;
463 uint64_t last_found_pos = 0;
464 int cur_track;
465 int64_t cur_timestamp = AV_NOPTS_VALUE;
466 int len;
467 AVIOContext *pb = s->pb;
468 GXFPktType type;
469 tmp = avio_rb32(pb);
470 start:
471 while (tmp)
472 READ_ONE();
473 READ_ONE();
474 if (tmp != 1)
475 goto start;
476 last_pos = avio_tell(pb);
477 if (avio_seek(pb, -5, SEEK_CUR) < 0)
478 goto out;
479 if (!parse_packet_header(pb, &type, &len) || type != PKT_MEDIA) {
480 if (avio_seek(pb, last_pos, SEEK_SET) < 0)
481 goto out;
482 goto start;
483 }
484 avio_r8(pb);
485 cur_track = avio_r8(pb);
486 cur_timestamp = avio_rb32(pb);
487 last_found_pos = avio_tell(pb) - 16 - 6;
488 if ((track >= 0 && track != cur_track) || (timestamp >= 0 && timestamp > cur_timestamp)) {
489 if (avio_seek(pb, last_pos, SEEK_SET) >= 0)
490 goto start;
491 }
492 out:
493 if (last_found_pos)
494 avio_seek(pb, last_found_pos, SEEK_SET);
495 return cur_timestamp;
496 }
497
gxf_packet(AVFormatContext * s,AVPacket * pkt)498 static int gxf_packet(AVFormatContext *s, AVPacket *pkt) {
499 AVIOContext *pb = s->pb;
500 GXFPktType pkt_type;
501 int pkt_len;
502 struct gxf_stream_info *si = s->priv_data;
503
504 while (!pb->eof_reached) {
505 AVStream *st;
506 int track_type, track_id, ret;
507 int field_nr, field_info, skip = 0;
508 int stream_index;
509 if (!parse_packet_header(pb, &pkt_type, &pkt_len)) {
510 if (!avio_feof(pb))
511 av_log(s, AV_LOG_ERROR, "sync lost\n");
512 return -1;
513 }
514 if (pkt_type == PKT_FLT) {
515 gxf_read_index(s, pkt_len);
516 continue;
517 }
518 if (pkt_type != PKT_MEDIA) {
519 avio_skip(pb, pkt_len);
520 continue;
521 }
522 if (pkt_len < 16) {
523 av_log(s, AV_LOG_ERROR, "invalid media packet length\n");
524 continue;
525 }
526 pkt_len -= 16;
527 track_type = avio_r8(pb);
528 track_id = avio_r8(pb);
529 stream_index = get_sindex(s, track_id, track_type);
530 if (stream_index < 0)
531 return stream_index;
532 st = s->streams[stream_index];
533 field_nr = avio_rb32(pb);
534 field_info = avio_rb32(pb);
535 avio_rb32(pb); // "timeline" field number
536 avio_r8(pb); // flags
537 avio_r8(pb); // reserved
538 if (st->codecpar->codec_id == AV_CODEC_ID_PCM_S24LE ||
539 st->codecpar->codec_id == AV_CODEC_ID_PCM_S16LE) {
540 int first = field_info >> 16;
541 int last = field_info & 0xffff; // last is exclusive
542 int bps = av_get_bits_per_sample(st->codecpar->codec_id)>>3;
543 if (first <= last && last*bps <= pkt_len) {
544 avio_skip(pb, first*bps);
545 skip = pkt_len - last*bps;
546 pkt_len = (last-first)*bps;
547 } else
548 av_log(s, AV_LOG_ERROR, "invalid first and last sample values\n");
549 }
550 ret = av_get_packet(pb, pkt, pkt_len);
551 if (skip)
552 avio_skip(pb, skip);
553 pkt->stream_index = stream_index;
554 pkt->dts = field_nr;
555
556 //set duration manually for DV or else lavf misdetects the frame rate
557 if (st->codecpar->codec_id == AV_CODEC_ID_DVVIDEO)
558 pkt->duration = si->fields_per_frame;
559
560 return ret;
561 }
562 return AVERROR_EOF;
563 }
564
gxf_seek(AVFormatContext * s,int stream_index,int64_t timestamp,int flags)565 static int gxf_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) {
566 int64_t res = 0;
567 uint64_t pos;
568 uint64_t maxlen = 100 * 1024 * 1024;
569 AVStream *st = s->streams[0];
570 int64_t start_time = s->streams[stream_index]->start_time;
571 int64_t found;
572 int idx;
573 if (timestamp < start_time) timestamp = start_time;
574 idx = av_index_search_timestamp(st, timestamp - start_time,
575 AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
576 if (idx < 0)
577 return -1;
578 pos = st->index_entries[idx].pos;
579 if (idx < st->nb_index_entries - 2)
580 maxlen = st->index_entries[idx + 2].pos - pos;
581 maxlen = FFMAX(maxlen, 200 * 1024);
582 res = avio_seek(s->pb, pos, SEEK_SET);
583 if (res < 0)
584 return res;
585 found = gxf_resync_media(s, maxlen, -1, timestamp);
586 if (FFABS(found - timestamp) > 4)
587 return -1;
588 return 0;
589 }
590
gxf_read_timestamp(AVFormatContext * s,int stream_index,int64_t * pos,int64_t pos_limit)591 static int64_t gxf_read_timestamp(AVFormatContext *s, int stream_index,
592 int64_t *pos, int64_t pos_limit) {
593 AVIOContext *pb = s->pb;
594 int64_t res;
595 if (avio_seek(pb, *pos, SEEK_SET) < 0)
596 return AV_NOPTS_VALUE;
597 res = gxf_resync_media(s, pos_limit - *pos, -1, -1);
598 *pos = avio_tell(pb);
599 return res;
600 }
601
602 AVInputFormat ff_gxf_demuxer = {
603 .name = "gxf",
604 .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