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2ba45a60 DM |
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 | */ | |
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 | */ | |
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 | */ | |
89 | static int gxf_probe(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 | */ | |
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->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
118 | st->codec->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->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
126 | st->codec->codec_id = AV_CODEC_ID_DVVIDEO; | |
127 | break; | |
128 | case 11: | |
129 | case 12: | |
130 | case 20: | |
131 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
132 | st->codec->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->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
138 | st->codec->codec_id = AV_CODEC_ID_MPEG1VIDEO; | |
139 | st->need_parsing = AVSTREAM_PARSE_HEADERS; //get keyframe flag etc. | |
140 | break; | |
141 | case 9: | |
142 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
143 | st->codec->codec_id = AV_CODEC_ID_PCM_S24LE; | |
144 | st->codec->channels = 1; | |
145 | st->codec->channel_layout = AV_CH_LAYOUT_MONO; | |
146 | st->codec->sample_rate = 48000; | |
147 | st->codec->bit_rate = 3 * 1 * 48000 * 8; | |
148 | st->codec->block_align = 3 * 1; | |
149 | st->codec->bits_per_coded_sample = 24; | |
150 | break; | |
151 | case 10: | |
152 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
153 | st->codec->codec_id = AV_CODEC_ID_PCM_S16LE; | |
154 | st->codec->channels = 1; | |
155 | st->codec->channel_layout = AV_CH_LAYOUT_MONO; | |
156 | st->codec->sample_rate = 48000; | |
157 | st->codec->bit_rate = 2 * 1 * 48000 * 8; | |
158 | st->codec->block_align = 2 * 1; | |
159 | st->codec->bits_per_coded_sample = 16; | |
160 | break; | |
161 | case 17: | |
162 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
163 | st->codec->codec_id = AV_CODEC_ID_AC3; | |
164 | st->codec->channels = 2; | |
165 | st->codec->channel_layout = AV_CH_LAYOUT_STEREO; | |
166 | st->codec->sample_rate = 48000; | |
167 | break; | |
168 | case 26: /* AVCi50 / AVCi100 (AVC Intra) */ | |
169 | case 29: /* AVCHD */ | |
170 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
171 | st->codec->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->codec->codec_type = AVMEDIA_TYPE_DATA; | |
179 | st->codec->codec_id = AV_CODEC_ID_NONE; | |
180 | break; | |
181 | case 30: | |
182 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
183 | st->codec->codec_id = AV_CODEC_ID_DNXHD; | |
184 | break; | |
185 | default: | |
186 | st->codec->codec_type = AVMEDIA_TYPE_UNKNOWN; | |
187 | st->codec->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 | */ | |
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 | */ | |
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 | */ | |
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 | */ | |
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 | */ | |
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 = avio_rl32(pb); | |
289 | uint32_t map_cnt = avio_rl32(pb); | |
290 | int i; | |
291 | pkt_len -= 8; | |
292 | if ((s->flags & AVFMT_FLAG_IGNIDX) || !s->streams) { | |
293 | avio_skip(pb, pkt_len); | |
294 | return; | |
295 | } | |
296 | st = s->streams[0]; | |
297 | if (map_cnt > 1000) { | |
298 | av_log(s, AV_LOG_ERROR, | |
299 | "too many index entries %"PRIu32" (%"PRIx32")\n", | |
300 | map_cnt, map_cnt); | |
301 | map_cnt = 1000; | |
302 | } | |
303 | if (pkt_len < 4 * map_cnt) { | |
304 | av_log(s, AV_LOG_ERROR, "invalid index length\n"); | |
305 | avio_skip(pb, pkt_len); | |
306 | return; | |
307 | } | |
308 | pkt_len -= 4 * map_cnt; | |
309 | av_add_index_entry(st, 0, 0, 0, 0, 0); | |
310 | for (i = 0; i < map_cnt; i++) | |
311 | av_add_index_entry(st, (uint64_t)avio_rl32(pb) * 1024, | |
312 | i * (uint64_t)fields_per_map + 1, 0, 0, 0); | |
313 | avio_skip(pb, pkt_len); | |
314 | } | |
315 | ||
316 | static int gxf_header(AVFormatContext *s) { | |
317 | AVIOContext *pb = s->pb; | |
318 | GXFPktType pkt_type; | |
319 | int map_len; | |
320 | int len; | |
321 | AVRational main_timebase = {0, 0}; | |
322 | struct gxf_stream_info *si = s->priv_data; | |
323 | int i; | |
324 | if (!parse_packet_header(pb, &pkt_type, &map_len) || pkt_type != PKT_MAP) { | |
325 | av_log(s, AV_LOG_ERROR, "map packet not found\n"); | |
326 | return 0; | |
327 | } | |
328 | map_len -= 2; | |
329 | if (avio_r8(pb) != 0x0e0 || avio_r8(pb) != 0xff) { | |
330 | av_log(s, AV_LOG_ERROR, "unknown version or invalid map preamble\n"); | |
331 | return 0; | |
332 | } | |
333 | map_len -= 2; | |
334 | len = avio_rb16(pb); // length of material data section | |
335 | if (len > map_len) { | |
336 | av_log(s, AV_LOG_ERROR, "material data longer than map data\n"); | |
337 | return 0; | |
338 | } | |
339 | map_len -= len; | |
340 | gxf_material_tags(pb, &len, si); | |
341 | avio_skip(pb, len); | |
342 | map_len -= 2; | |
343 | len = avio_rb16(pb); // length of track description | |
344 | if (len > map_len) { | |
345 | av_log(s, AV_LOG_ERROR, "track description longer than map data\n"); | |
346 | return 0; | |
347 | } | |
348 | map_len -= len; | |
349 | while (len > 0) { | |
350 | int track_type, track_id, track_len; | |
351 | AVStream *st; | |
352 | int idx; | |
353 | len -= 4; | |
354 | track_type = avio_r8(pb); | |
355 | track_id = avio_r8(pb); | |
356 | track_len = avio_rb16(pb); | |
357 | len -= track_len; | |
358 | if (!(track_type & 0x80)) { | |
359 | av_log(s, AV_LOG_ERROR, "invalid track type %x\n", track_type); | |
360 | continue; | |
361 | } | |
362 | track_type &= 0x7f; | |
363 | if ((track_id & 0xc0) != 0xc0) { | |
364 | av_log(s, AV_LOG_ERROR, "invalid track id %x\n", track_id); | |
365 | continue; | |
366 | } | |
367 | track_id &= 0x3f; | |
368 | gxf_track_tags(pb, &track_len, si); | |
369 | // check for timecode tracks | |
370 | if (track_type == 7 || track_type == 8 || track_type == 24) { | |
371 | add_timecode_metadata(&s->metadata, "timecode", | |
372 | si->track_aux_data & 0xffffffff, | |
373 | si->fields_per_frame); | |
374 | ||
375 | } | |
376 | avio_skip(pb, track_len); | |
377 | ||
378 | idx = get_sindex(s, track_id, track_type); | |
379 | if (idx < 0) continue; | |
380 | st = s->streams[idx]; | |
381 | if (!main_timebase.num || !main_timebase.den) { | |
382 | main_timebase.num = si->frames_per_second.den; | |
383 | main_timebase.den = si->frames_per_second.num * 2; | |
384 | } | |
385 | st->start_time = si->first_field; | |
386 | if (si->first_field != AV_NOPTS_VALUE && si->last_field != AV_NOPTS_VALUE) | |
387 | st->duration = si->last_field - si->first_field; | |
388 | } | |
389 | if (len < 0) | |
390 | av_log(s, AV_LOG_ERROR, "invalid track description length specified\n"); | |
391 | if (map_len) | |
392 | avio_skip(pb, map_len); | |
393 | if (!parse_packet_header(pb, &pkt_type, &len)) { | |
394 | av_log(s, AV_LOG_ERROR, "sync lost in header\n"); | |
395 | return -1; | |
396 | } | |
397 | if (pkt_type == PKT_FLT) { | |
398 | gxf_read_index(s, len); | |
399 | if (!parse_packet_header(pb, &pkt_type, &len)) { | |
400 | av_log(s, AV_LOG_ERROR, "sync lost in header\n"); | |
401 | return -1; | |
402 | } | |
403 | } | |
404 | if (pkt_type == PKT_UMF) { | |
405 | if (len >= 0x39) { | |
406 | AVRational fps; | |
407 | len -= 0x39; | |
408 | avio_skip(pb, 5); // preamble | |
409 | avio_skip(pb, 0x30); // payload description | |
410 | fps = fps_umf2avr(avio_rl32(pb)); | |
411 | if (!main_timebase.num || !main_timebase.den) { | |
412 | av_log(s, AV_LOG_WARNING, "No FPS track tag, using UMF fps tag." | |
413 | " This might give wrong results.\n"); | |
414 | // this may not always be correct, but simply the best we can get | |
415 | main_timebase.num = fps.den; | |
416 | main_timebase.den = fps.num * 2; | |
417 | } | |
418 | ||
419 | if (len >= 0x18) { | |
420 | len -= 0x18; | |
421 | avio_skip(pb, 0x10); | |
422 | add_timecode_metadata(&s->metadata, "timecode_at_mark_in", | |
423 | avio_rl32(pb), si->fields_per_frame); | |
424 | add_timecode_metadata(&s->metadata, "timecode_at_mark_out", | |
425 | avio_rl32(pb), si->fields_per_frame); | |
426 | } | |
427 | } else | |
428 | av_log(s, AV_LOG_INFO, "UMF packet too short\n"); | |
429 | } else | |
430 | av_log(s, AV_LOG_INFO, "UMF packet missing\n"); | |
431 | avio_skip(pb, len); | |
432 | // set a fallback value, 60000/1001 is specified for audio-only files | |
433 | // so use that regardless of why we do not know the video frame rate. | |
434 | if (!main_timebase.num || !main_timebase.den) | |
435 | main_timebase = (AVRational){1001, 60000}; | |
436 | for (i = 0; i < s->nb_streams; i++) { | |
437 | AVStream *st = s->streams[i]; | |
438 | avpriv_set_pts_info(st, 32, main_timebase.num, main_timebase.den); | |
439 | } | |
440 | return 0; | |
441 | } | |
442 | ||
443 | #define READ_ONE() \ | |
444 | { \ | |
445 | if (!max_interval-- || avio_feof(pb)) \ | |
446 | goto out; \ | |
447 | tmp = tmp << 8 | avio_r8(pb); \ | |
448 | } | |
449 | ||
450 | /** | |
451 | * @brief resync the stream on the next media packet with specified properties | |
452 | * @param max_interval how many bytes to search for matching packet at most | |
453 | * @param track track id the media packet must belong to, -1 for any | |
454 | * @param timestamp minimum timestamp (== field number) the packet must have, -1 for any | |
455 | * @return timestamp of packet found | |
456 | */ | |
457 | static int64_t gxf_resync_media(AVFormatContext *s, uint64_t max_interval, int track, int timestamp) { | |
458 | uint32_t tmp; | |
459 | uint64_t last_pos; | |
460 | uint64_t last_found_pos = 0; | |
461 | int cur_track; | |
462 | int64_t cur_timestamp = AV_NOPTS_VALUE; | |
463 | int len; | |
464 | AVIOContext *pb = s->pb; | |
465 | GXFPktType type; | |
466 | tmp = avio_rb32(pb); | |
467 | start: | |
468 | while (tmp) | |
469 | READ_ONE(); | |
470 | READ_ONE(); | |
471 | if (tmp != 1) | |
472 | goto start; | |
473 | last_pos = avio_tell(pb); | |
474 | if (avio_seek(pb, -5, SEEK_CUR) < 0) | |
475 | goto out; | |
476 | if (!parse_packet_header(pb, &type, &len) || type != PKT_MEDIA) { | |
477 | if (avio_seek(pb, last_pos, SEEK_SET) < 0) | |
478 | goto out; | |
479 | goto start; | |
480 | } | |
481 | avio_r8(pb); | |
482 | cur_track = avio_r8(pb); | |
483 | cur_timestamp = avio_rb32(pb); | |
484 | last_found_pos = avio_tell(pb) - 16 - 6; | |
485 | if ((track >= 0 && track != cur_track) || (timestamp >= 0 && timestamp > cur_timestamp)) { | |
486 | if (avio_seek(pb, last_pos, SEEK_SET) >= 0) | |
487 | goto start; | |
488 | } | |
489 | out: | |
490 | if (last_found_pos) | |
491 | avio_seek(pb, last_found_pos, SEEK_SET); | |
492 | return cur_timestamp; | |
493 | } | |
494 | ||
495 | static int gxf_packet(AVFormatContext *s, AVPacket *pkt) { | |
496 | AVIOContext *pb = s->pb; | |
497 | GXFPktType pkt_type; | |
498 | int pkt_len; | |
499 | struct gxf_stream_info *si = s->priv_data; | |
500 | ||
501 | while (!pb->eof_reached) { | |
502 | AVStream *st; | |
503 | int track_type, track_id, ret; | |
504 | int field_nr, field_info, skip = 0; | |
505 | int stream_index; | |
506 | if (!parse_packet_header(pb, &pkt_type, &pkt_len)) { | |
507 | if (!avio_feof(pb)) | |
508 | av_log(s, AV_LOG_ERROR, "sync lost\n"); | |
509 | return -1; | |
510 | } | |
511 | if (pkt_type == PKT_FLT) { | |
512 | gxf_read_index(s, pkt_len); | |
513 | continue; | |
514 | } | |
515 | if (pkt_type != PKT_MEDIA) { | |
516 | avio_skip(pb, pkt_len); | |
517 | continue; | |
518 | } | |
519 | if (pkt_len < 16) { | |
520 | av_log(s, AV_LOG_ERROR, "invalid media packet length\n"); | |
521 | continue; | |
522 | } | |
523 | pkt_len -= 16; | |
524 | track_type = avio_r8(pb); | |
525 | track_id = avio_r8(pb); | |
526 | stream_index = get_sindex(s, track_id, track_type); | |
527 | if (stream_index < 0) | |
528 | return stream_index; | |
529 | st = s->streams[stream_index]; | |
530 | field_nr = avio_rb32(pb); | |
531 | field_info = avio_rb32(pb); | |
532 | avio_rb32(pb); // "timeline" field number | |
533 | avio_r8(pb); // flags | |
534 | avio_r8(pb); // reserved | |
535 | if (st->codec->codec_id == AV_CODEC_ID_PCM_S24LE || | |
536 | st->codec->codec_id == AV_CODEC_ID_PCM_S16LE) { | |
537 | int first = field_info >> 16; | |
538 | int last = field_info & 0xffff; // last is exclusive | |
539 | int bps = av_get_bits_per_sample(st->codec->codec_id)>>3; | |
540 | if (first <= last && last*bps <= pkt_len) { | |
541 | avio_skip(pb, first*bps); | |
542 | skip = pkt_len - last*bps; | |
543 | pkt_len = (last-first)*bps; | |
544 | } else | |
545 | av_log(s, AV_LOG_ERROR, "invalid first and last sample values\n"); | |
546 | } | |
547 | ret = av_get_packet(pb, pkt, pkt_len); | |
548 | if (skip) | |
549 | avio_skip(pb, skip); | |
550 | pkt->stream_index = stream_index; | |
551 | pkt->dts = field_nr; | |
552 | ||
553 | //set duration manually for DV or else lavf misdetects the frame rate | |
554 | if (st->codec->codec_id == AV_CODEC_ID_DVVIDEO) | |
555 | pkt->duration = si->fields_per_frame; | |
556 | ||
557 | return ret; | |
558 | } | |
559 | return AVERROR_EOF; | |
560 | } | |
561 | ||
562 | static int gxf_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) { | |
563 | int res = 0; | |
564 | uint64_t pos; | |
565 | uint64_t maxlen = 100 * 1024 * 1024; | |
566 | AVStream *st = s->streams[0]; | |
567 | int64_t start_time = s->streams[stream_index]->start_time; | |
568 | int64_t found; | |
569 | int idx; | |
570 | if (timestamp < start_time) timestamp = start_time; | |
571 | idx = av_index_search_timestamp(st, timestamp - start_time, | |
572 | AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD); | |
573 | if (idx < 0) | |
574 | return -1; | |
575 | pos = st->index_entries[idx].pos; | |
576 | if (idx < st->nb_index_entries - 2) | |
577 | maxlen = st->index_entries[idx + 2].pos - pos; | |
578 | maxlen = FFMAX(maxlen, 200 * 1024); | |
579 | res = avio_seek(s->pb, pos, SEEK_SET); | |
580 | if (res < 0) | |
581 | return res; | |
582 | found = gxf_resync_media(s, maxlen, -1, timestamp); | |
583 | if (FFABS(found - timestamp) > 4) | |
584 | return -1; | |
585 | return 0; | |
586 | } | |
587 | ||
588 | static int64_t gxf_read_timestamp(AVFormatContext *s, int stream_index, | |
589 | int64_t *pos, int64_t pos_limit) { | |
590 | AVIOContext *pb = s->pb; | |
591 | int64_t res; | |
592 | if (avio_seek(pb, *pos, SEEK_SET) < 0) | |
593 | return AV_NOPTS_VALUE; | |
594 | res = gxf_resync_media(s, pos_limit - *pos, -1, -1); | |
595 | *pos = avio_tell(pb); | |
596 | return res; | |
597 | } | |
598 | ||
599 | AVInputFormat ff_gxf_demuxer = { | |
600 | .name = "gxf", | |
601 | .long_name = NULL_IF_CONFIG_SMALL("GXF (General eXchange Format)"), | |
602 | .priv_data_size = sizeof(struct gxf_stream_info), | |
603 | .read_probe = gxf_probe, | |
604 | .read_header = gxf_header, | |
605 | .read_packet = gxf_packet, | |
606 | .read_seek = gxf_seek, | |
607 | .read_timestamp = gxf_read_timestamp, | |
608 | }; |