Commit | Line | Data |
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2ba45a60 DM |
1 | /* |
2 | * "NUT" Container Format demuxer | |
3 | * Copyright (c) 2004-2006 Michael Niedermayer | |
4 | * Copyright (c) 2003 Alex Beregszaszi | |
5 | * | |
6 | * This file is part of FFmpeg. | |
7 | * | |
8 | * FFmpeg is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; either | |
11 | * version 2.1 of the License, or (at your option) any later version. | |
12 | * | |
13 | * FFmpeg is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with FFmpeg; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
21 | */ | |
22 | ||
23 | #include "libavutil/avstring.h" | |
24 | #include "libavutil/avassert.h" | |
25 | #include "libavutil/bswap.h" | |
26 | #include "libavutil/dict.h" | |
27 | #include "libavutil/intreadwrite.h" | |
28 | #include "libavutil/mathematics.h" | |
29 | #include "libavutil/tree.h" | |
30 | #include "libavcodec/bytestream.h" | |
31 | #include "avio_internal.h" | |
32 | #include "isom.h" | |
33 | #include "nut.h" | |
34 | #include "riff.h" | |
35 | ||
36 | #define NUT_MAX_STREAMS 256 /* arbitrary sanity check value */ | |
37 | ||
38 | static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index, | |
39 | int64_t *pos_arg, int64_t pos_limit); | |
40 | ||
41 | static int get_str(AVIOContext *bc, char *string, unsigned int maxlen) | |
42 | { | |
43 | unsigned int len = ffio_read_varlen(bc); | |
44 | ||
45 | if (len && maxlen) | |
46 | avio_read(bc, string, FFMIN(len, maxlen)); | |
47 | while (len > maxlen) { | |
48 | avio_r8(bc); | |
49 | len--; | |
50 | } | |
51 | ||
52 | if (maxlen) | |
53 | string[FFMIN(len, maxlen - 1)] = 0; | |
54 | ||
55 | if (maxlen == len) | |
56 | return -1; | |
57 | else | |
58 | return 0; | |
59 | } | |
60 | ||
61 | static int64_t get_s(AVIOContext *bc) | |
62 | { | |
63 | int64_t v = ffio_read_varlen(bc) + 1; | |
64 | ||
65 | if (v & 1) | |
66 | return -(v >> 1); | |
67 | else | |
68 | return (v >> 1); | |
69 | } | |
70 | ||
71 | static uint64_t get_fourcc(AVIOContext *bc) | |
72 | { | |
73 | unsigned int len = ffio_read_varlen(bc); | |
74 | ||
75 | if (len == 2) | |
76 | return avio_rl16(bc); | |
77 | else if (len == 4) | |
78 | return avio_rl32(bc); | |
79 | else { | |
80 | av_log(NULL, AV_LOG_ERROR, "Unsupported fourcc length %d\n", len); | |
81 | return -1; | |
82 | } | |
83 | } | |
84 | ||
85 | #ifdef TRACE | |
86 | static inline uint64_t get_v_trace(AVIOContext *bc, const char *file, | |
87 | const char *func, int line) | |
88 | { | |
89 | uint64_t v = ffio_read_varlen(bc); | |
90 | ||
91 | av_log(NULL, AV_LOG_DEBUG, "get_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", | |
92 | v, v, file, func, line); | |
93 | return v; | |
94 | } | |
95 | ||
96 | static inline int64_t get_s_trace(AVIOContext *bc, const char *file, | |
97 | const char *func, int line) | |
98 | { | |
99 | int64_t v = get_s(bc); | |
100 | ||
101 | av_log(NULL, AV_LOG_DEBUG, "get_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", | |
102 | v, v, file, func, line); | |
103 | return v; | |
104 | } | |
105 | ||
106 | static inline uint64_t get_4cc_trace(AVIOContext *bc, char *file, | |
107 | char *func, int line) | |
108 | { | |
109 | uint64_t v = get_fourcc(bc); | |
110 | ||
111 | av_log(NULL, AV_LOG_DEBUG, "get_fourcc %5"PRId64" / %"PRIX64" in %s %s:%d\n", | |
112 | v, v, file, func, line); | |
113 | return v; | |
114 | } | |
115 | #define ffio_read_varlen(bc) get_v_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__) | |
116 | #define get_s(bc) get_s_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__) | |
117 | #define get_fourcc(bc) get_4cc_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__) | |
118 | #endif | |
119 | ||
120 | static int get_packetheader(NUTContext *nut, AVIOContext *bc, | |
121 | int calculate_checksum, uint64_t startcode) | |
122 | { | |
123 | int64_t size; | |
124 | // start = avio_tell(bc) - 8; | |
125 | ||
126 | startcode = av_be2ne64(startcode); | |
127 | startcode = ff_crc04C11DB7_update(0, (uint8_t*) &startcode, 8); | |
128 | ||
129 | ffio_init_checksum(bc, ff_crc04C11DB7_update, startcode); | |
130 | size = ffio_read_varlen(bc); | |
131 | if (size > 4096) | |
132 | avio_rb32(bc); | |
133 | if (ffio_get_checksum(bc) && size > 4096) | |
134 | return -1; | |
135 | ||
136 | ffio_init_checksum(bc, calculate_checksum ? ff_crc04C11DB7_update : NULL, 0); | |
137 | ||
138 | return size; | |
139 | } | |
140 | ||
141 | static uint64_t find_any_startcode(AVIOContext *bc, int64_t pos) | |
142 | { | |
143 | uint64_t state = 0; | |
144 | ||
145 | if (pos >= 0) | |
146 | /* Note, this may fail if the stream is not seekable, but that should | |
147 | * not matter, as in this case we simply start where we currently are */ | |
148 | avio_seek(bc, pos, SEEK_SET); | |
149 | while (!avio_feof(bc)) { | |
150 | state = (state << 8) | avio_r8(bc); | |
151 | if ((state >> 56) != 'N') | |
152 | continue; | |
153 | switch (state) { | |
154 | case MAIN_STARTCODE: | |
155 | case STREAM_STARTCODE: | |
156 | case SYNCPOINT_STARTCODE: | |
157 | case INFO_STARTCODE: | |
158 | case INDEX_STARTCODE: | |
159 | return state; | |
160 | } | |
161 | } | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
166 | /** | |
167 | * Find the given startcode. | |
168 | * @param code the startcode | |
169 | * @param pos the start position of the search, or -1 if the current position | |
170 | * @return the position of the startcode or -1 if not found | |
171 | */ | |
172 | static int64_t find_startcode(AVIOContext *bc, uint64_t code, int64_t pos) | |
173 | { | |
174 | for (;;) { | |
175 | uint64_t startcode = find_any_startcode(bc, pos); | |
176 | if (startcode == code) | |
177 | return avio_tell(bc) - 8; | |
178 | else if (startcode == 0) | |
179 | return -1; | |
180 | pos = -1; | |
181 | } | |
182 | } | |
183 | ||
184 | static int nut_probe(AVProbeData *p) | |
185 | { | |
186 | int i; | |
187 | ||
188 | for (i = 0; i < p->buf_size-8; i++) { | |
189 | if (AV_RB32(p->buf+i) != MAIN_STARTCODE>>32) | |
190 | continue; | |
191 | if (AV_RB32(p->buf+i+4) == (MAIN_STARTCODE & 0xFFFFFFFF)) | |
192 | return AVPROBE_SCORE_MAX; | |
193 | } | |
194 | return 0; | |
195 | } | |
196 | ||
197 | #define GET_V(dst, check) \ | |
198 | do { \ | |
199 | tmp = ffio_read_varlen(bc); \ | |
200 | if (!(check)) { \ | |
201 | av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp); \ | |
202 | return AVERROR_INVALIDDATA; \ | |
203 | } \ | |
204 | dst = tmp; \ | |
205 | } while (0) | |
206 | ||
207 | static int skip_reserved(AVIOContext *bc, int64_t pos) | |
208 | { | |
209 | pos -= avio_tell(bc); | |
210 | if (pos < 0) { | |
211 | avio_seek(bc, pos, SEEK_CUR); | |
212 | return AVERROR_INVALIDDATA; | |
213 | } else { | |
214 | while (pos--) | |
215 | avio_r8(bc); | |
216 | return 0; | |
217 | } | |
218 | } | |
219 | ||
220 | static int decode_main_header(NUTContext *nut) | |
221 | { | |
222 | AVFormatContext *s = nut->avf; | |
223 | AVIOContext *bc = s->pb; | |
224 | uint64_t tmp, end; | |
225 | unsigned int stream_count; | |
226 | int i, j, count; | |
227 | int tmp_stream, tmp_mul, tmp_pts, tmp_size, tmp_res, tmp_head_idx; | |
228 | ||
229 | end = get_packetheader(nut, bc, 1, MAIN_STARTCODE); | |
230 | end += avio_tell(bc); | |
231 | ||
232 | nut->version = ffio_read_varlen(bc); | |
233 | if (nut->version < NUT_MIN_VERSION && | |
234 | nut->version > NUT_MAX_VERSION) { | |
235 | av_log(s, AV_LOG_ERROR, "Version %d not supported.\n", | |
236 | nut->version); | |
237 | return AVERROR(ENOSYS); | |
238 | } | |
239 | if (nut->version > 3) | |
240 | nut->minor_version = ffio_read_varlen(bc); | |
241 | ||
242 | GET_V(stream_count, tmp > 0 && tmp <= NUT_MAX_STREAMS); | |
243 | ||
244 | nut->max_distance = ffio_read_varlen(bc); | |
245 | if (nut->max_distance > 65536) { | |
246 | av_log(s, AV_LOG_DEBUG, "max_distance %d\n", nut->max_distance); | |
247 | nut->max_distance = 65536; | |
248 | } | |
249 | ||
250 | GET_V(nut->time_base_count, tmp > 0 && tmp < INT_MAX / sizeof(AVRational)); | |
251 | nut->time_base = av_malloc(nut->time_base_count * sizeof(AVRational)); | |
252 | if (!nut->time_base) | |
253 | return AVERROR(ENOMEM); | |
254 | ||
255 | for (i = 0; i < nut->time_base_count; i++) { | |
256 | GET_V(nut->time_base[i].num, tmp > 0 && tmp < (1ULL << 31)); | |
257 | GET_V(nut->time_base[i].den, tmp > 0 && tmp < (1ULL << 31)); | |
258 | if (av_gcd(nut->time_base[i].num, nut->time_base[i].den) != 1) { | |
259 | av_log(s, AV_LOG_ERROR, "time base invalid\n"); | |
260 | return AVERROR_INVALIDDATA; | |
261 | } | |
262 | } | |
263 | tmp_pts = 0; | |
264 | tmp_mul = 1; | |
265 | tmp_stream = 0; | |
266 | tmp_head_idx = 0; | |
267 | for (i = 0; i < 256;) { | |
268 | int tmp_flags = ffio_read_varlen(bc); | |
269 | int tmp_fields = ffio_read_varlen(bc); | |
270 | ||
271 | if (tmp_fields > 0) | |
272 | tmp_pts = get_s(bc); | |
273 | if (tmp_fields > 1) | |
274 | tmp_mul = ffio_read_varlen(bc); | |
275 | if (tmp_fields > 2) | |
276 | tmp_stream = ffio_read_varlen(bc); | |
277 | if (tmp_fields > 3) | |
278 | tmp_size = ffio_read_varlen(bc); | |
279 | else | |
280 | tmp_size = 0; | |
281 | if (tmp_fields > 4) | |
282 | tmp_res = ffio_read_varlen(bc); | |
283 | else | |
284 | tmp_res = 0; | |
285 | if (tmp_fields > 5) | |
286 | count = ffio_read_varlen(bc); | |
287 | else | |
288 | count = tmp_mul - tmp_size; | |
289 | if (tmp_fields > 6) | |
290 | get_s(bc); | |
291 | if (tmp_fields > 7) | |
292 | tmp_head_idx = ffio_read_varlen(bc); | |
293 | ||
294 | while (tmp_fields-- > 8) | |
295 | ffio_read_varlen(bc); | |
296 | ||
297 | if (count == 0 || i + count > 256) { | |
298 | av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i); | |
299 | return AVERROR_INVALIDDATA; | |
300 | } | |
301 | if (tmp_stream >= stream_count) { | |
302 | av_log(s, AV_LOG_ERROR, "illegal stream number\n"); | |
303 | return AVERROR_INVALIDDATA; | |
304 | } | |
305 | ||
306 | for (j = 0; j < count; j++, i++) { | |
307 | if (i == 'N') { | |
308 | nut->frame_code[i].flags = FLAG_INVALID; | |
309 | j--; | |
310 | continue; | |
311 | } | |
312 | nut->frame_code[i].flags = tmp_flags; | |
313 | nut->frame_code[i].pts_delta = tmp_pts; | |
314 | nut->frame_code[i].stream_id = tmp_stream; | |
315 | nut->frame_code[i].size_mul = tmp_mul; | |
316 | nut->frame_code[i].size_lsb = tmp_size + j; | |
317 | nut->frame_code[i].reserved_count = tmp_res; | |
318 | nut->frame_code[i].header_idx = tmp_head_idx; | |
319 | } | |
320 | } | |
321 | av_assert0(nut->frame_code['N'].flags == FLAG_INVALID); | |
322 | ||
323 | if (end > avio_tell(bc) + 4) { | |
324 | int rem = 1024; | |
325 | GET_V(nut->header_count, tmp < 128U); | |
326 | nut->header_count++; | |
327 | for (i = 1; i < nut->header_count; i++) { | |
328 | uint8_t *hdr; | |
329 | GET_V(nut->header_len[i], tmp > 0 && tmp < 256); | |
330 | rem -= nut->header_len[i]; | |
331 | if (rem < 0) { | |
332 | av_log(s, AV_LOG_ERROR, "invalid elision header\n"); | |
333 | return AVERROR_INVALIDDATA; | |
334 | } | |
335 | hdr = av_malloc(nut->header_len[i]); | |
336 | if (!hdr) | |
337 | return AVERROR(ENOMEM); | |
338 | avio_read(bc, hdr, nut->header_len[i]); | |
339 | nut->header[i] = hdr; | |
340 | } | |
341 | av_assert0(nut->header_len[0] == 0); | |
342 | } | |
343 | ||
344 | // flags had been effectively introduced in version 4 | |
345 | if (nut->version > 3 && end > avio_tell(bc) + 4) { | |
346 | nut->flags = ffio_read_varlen(bc); | |
347 | } | |
348 | ||
349 | if (skip_reserved(bc, end) || ffio_get_checksum(bc)) { | |
350 | av_log(s, AV_LOG_ERROR, "main header checksum mismatch\n"); | |
351 | return AVERROR_INVALIDDATA; | |
352 | } | |
353 | ||
354 | nut->stream = av_calloc(stream_count, sizeof(StreamContext)); | |
355 | if (!nut->stream) | |
356 | return AVERROR(ENOMEM); | |
357 | for (i = 0; i < stream_count; i++) | |
358 | avformat_new_stream(s, NULL); | |
359 | ||
360 | return 0; | |
361 | } | |
362 | ||
363 | static int decode_stream_header(NUTContext *nut) | |
364 | { | |
365 | AVFormatContext *s = nut->avf; | |
366 | AVIOContext *bc = s->pb; | |
367 | StreamContext *stc; | |
368 | int class, stream_id; | |
369 | uint64_t tmp, end; | |
370 | AVStream *st; | |
371 | ||
372 | end = get_packetheader(nut, bc, 1, STREAM_STARTCODE); | |
373 | end += avio_tell(bc); | |
374 | ||
375 | GET_V(stream_id, tmp < s->nb_streams && !nut->stream[tmp].time_base); | |
376 | stc = &nut->stream[stream_id]; | |
377 | st = s->streams[stream_id]; | |
378 | if (!st) | |
379 | return AVERROR(ENOMEM); | |
380 | ||
381 | class = ffio_read_varlen(bc); | |
382 | tmp = get_fourcc(bc); | |
383 | st->codec->codec_tag = tmp; | |
384 | switch (class) { | |
385 | case 0: | |
386 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
387 | st->codec->codec_id = av_codec_get_id((const AVCodecTag * const []) { | |
388 | ff_nut_video_tags, | |
389 | ff_codec_bmp_tags, | |
390 | ff_codec_movvideo_tags, | |
391 | 0 | |
392 | }, | |
393 | tmp); | |
394 | break; | |
395 | case 1: | |
396 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
397 | st->codec->codec_id = av_codec_get_id((const AVCodecTag * const []) { | |
398 | ff_nut_audio_tags, | |
399 | ff_codec_wav_tags, | |
400 | ff_nut_audio_extra_tags, | |
401 | 0 | |
402 | }, | |
403 | tmp); | |
404 | break; | |
405 | case 2: | |
406 | st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; | |
407 | st->codec->codec_id = ff_codec_get_id(ff_nut_subtitle_tags, tmp); | |
408 | break; | |
409 | case 3: | |
410 | st->codec->codec_type = AVMEDIA_TYPE_DATA; | |
411 | st->codec->codec_id = ff_codec_get_id(ff_nut_data_tags, tmp); | |
412 | break; | |
413 | default: | |
414 | av_log(s, AV_LOG_ERROR, "unknown stream class (%d)\n", class); | |
415 | return AVERROR(ENOSYS); | |
416 | } | |
417 | if (class < 3 && st->codec->codec_id == AV_CODEC_ID_NONE) | |
418 | av_log(s, AV_LOG_ERROR, | |
419 | "Unknown codec tag '0x%04x' for stream number %d\n", | |
420 | (unsigned int) tmp, stream_id); | |
421 | ||
422 | GET_V(stc->time_base_id, tmp < nut->time_base_count); | |
423 | GET_V(stc->msb_pts_shift, tmp < 16); | |
424 | stc->max_pts_distance = ffio_read_varlen(bc); | |
425 | GET_V(stc->decode_delay, tmp < 1000); // sanity limit, raise this if Moore's law is true | |
426 | st->codec->has_b_frames = stc->decode_delay; | |
427 | ffio_read_varlen(bc); // stream flags | |
428 | ||
429 | GET_V(st->codec->extradata_size, tmp < (1 << 30)); | |
430 | if (st->codec->extradata_size) { | |
431 | if (ff_get_extradata(st->codec, bc, st->codec->extradata_size) < 0) | |
432 | return AVERROR(ENOMEM); | |
433 | } | |
434 | ||
435 | if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) { | |
436 | GET_V(st->codec->width, tmp > 0); | |
437 | GET_V(st->codec->height, tmp > 0); | |
438 | st->sample_aspect_ratio.num = ffio_read_varlen(bc); | |
439 | st->sample_aspect_ratio.den = ffio_read_varlen(bc); | |
440 | if ((!st->sample_aspect_ratio.num) != (!st->sample_aspect_ratio.den)) { | |
441 | av_log(s, AV_LOG_ERROR, "invalid aspect ratio %d/%d\n", | |
442 | st->sample_aspect_ratio.num, st->sample_aspect_ratio.den); | |
443 | return AVERROR_INVALIDDATA; | |
444 | } | |
445 | ffio_read_varlen(bc); /* csp type */ | |
446 | } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) { | |
447 | GET_V(st->codec->sample_rate, tmp > 0); | |
448 | ffio_read_varlen(bc); // samplerate_den | |
449 | GET_V(st->codec->channels, tmp > 0); | |
450 | } | |
451 | if (skip_reserved(bc, end) || ffio_get_checksum(bc)) { | |
452 | av_log(s, AV_LOG_ERROR, | |
453 | "stream header %d checksum mismatch\n", stream_id); | |
454 | return AVERROR_INVALIDDATA; | |
455 | } | |
456 | stc->time_base = &nut->time_base[stc->time_base_id]; | |
457 | avpriv_set_pts_info(s->streams[stream_id], 63, stc->time_base->num, | |
458 | stc->time_base->den); | |
459 | return 0; | |
460 | } | |
461 | ||
462 | static void set_disposition_bits(AVFormatContext *avf, char *value, | |
463 | int stream_id) | |
464 | { | |
465 | int flag = 0, i; | |
466 | ||
467 | for (i = 0; ff_nut_dispositions[i].flag; ++i) | |
468 | if (!strcmp(ff_nut_dispositions[i].str, value)) | |
469 | flag = ff_nut_dispositions[i].flag; | |
470 | if (!flag) | |
471 | av_log(avf, AV_LOG_INFO, "unknown disposition type '%s'\n", value); | |
472 | for (i = 0; i < avf->nb_streams; ++i) | |
473 | if (stream_id == i || stream_id == -1) | |
474 | avf->streams[i]->disposition |= flag; | |
475 | } | |
476 | ||
477 | static int decode_info_header(NUTContext *nut) | |
478 | { | |
479 | AVFormatContext *s = nut->avf; | |
480 | AVIOContext *bc = s->pb; | |
481 | uint64_t tmp, chapter_start, chapter_len; | |
482 | unsigned int stream_id_plus1, count; | |
483 | int chapter_id, i; | |
484 | int64_t value, end; | |
485 | char name[256], str_value[1024], type_str[256]; | |
486 | const char *type; | |
f6fa7814 | 487 | int *event_flags = NULL; |
2ba45a60 DM |
488 | AVChapter *chapter = NULL; |
489 | AVStream *st = NULL; | |
490 | AVDictionary **metadata = NULL; | |
491 | int metadata_flag = 0; | |
492 | ||
493 | end = get_packetheader(nut, bc, 1, INFO_STARTCODE); | |
494 | end += avio_tell(bc); | |
495 | ||
496 | GET_V(stream_id_plus1, tmp <= s->nb_streams); | |
497 | chapter_id = get_s(bc); | |
498 | chapter_start = ffio_read_varlen(bc); | |
499 | chapter_len = ffio_read_varlen(bc); | |
500 | count = ffio_read_varlen(bc); | |
501 | ||
502 | if (chapter_id && !stream_id_plus1) { | |
503 | int64_t start = chapter_start / nut->time_base_count; | |
504 | chapter = avpriv_new_chapter(s, chapter_id, | |
505 | nut->time_base[chapter_start % | |
506 | nut->time_base_count], | |
507 | start, start + chapter_len, NULL); | |
508 | metadata = &chapter->metadata; | |
509 | } else if (stream_id_plus1) { | |
510 | st = s->streams[stream_id_plus1 - 1]; | |
511 | metadata = &st->metadata; | |
512 | event_flags = &st->event_flags; | |
513 | metadata_flag = AVSTREAM_EVENT_FLAG_METADATA_UPDATED; | |
514 | } else { | |
515 | metadata = &s->metadata; | |
516 | event_flags = &s->event_flags; | |
517 | metadata_flag = AVFMT_EVENT_FLAG_METADATA_UPDATED; | |
518 | } | |
519 | ||
520 | for (i = 0; i < count; i++) { | |
521 | get_str(bc, name, sizeof(name)); | |
522 | value = get_s(bc); | |
523 | if (value == -1) { | |
524 | type = "UTF-8"; | |
525 | get_str(bc, str_value, sizeof(str_value)); | |
526 | } else if (value == -2) { | |
527 | get_str(bc, type_str, sizeof(type_str)); | |
528 | type = type_str; | |
529 | get_str(bc, str_value, sizeof(str_value)); | |
530 | } else if (value == -3) { | |
531 | type = "s"; | |
532 | value = get_s(bc); | |
533 | } else if (value == -4) { | |
534 | type = "t"; | |
535 | value = ffio_read_varlen(bc); | |
536 | } else if (value < -4) { | |
537 | type = "r"; | |
538 | get_s(bc); | |
539 | } else { | |
540 | type = "v"; | |
541 | } | |
542 | ||
543 | if (stream_id_plus1 > s->nb_streams) { | |
544 | av_log(s, AV_LOG_ERROR, "invalid stream id for info packet\n"); | |
545 | continue; | |
546 | } | |
547 | ||
548 | if (!strcmp(type, "UTF-8")) { | |
549 | if (chapter_id == 0 && !strcmp(name, "Disposition")) { | |
550 | set_disposition_bits(s, str_value, stream_id_plus1 - 1); | |
551 | continue; | |
552 | } | |
553 | ||
554 | if (stream_id_plus1 && !strcmp(name, "r_frame_rate")) { | |
555 | sscanf(str_value, "%d/%d", &st->r_frame_rate.num, &st->r_frame_rate.den); | |
556 | if (st->r_frame_rate.num >= 1000LL*st->r_frame_rate.den) | |
557 | st->r_frame_rate.num = st->r_frame_rate.den = 0; | |
558 | continue; | |
559 | } | |
560 | ||
561 | if (metadata && av_strcasecmp(name, "Uses") && | |
562 | av_strcasecmp(name, "Depends") && av_strcasecmp(name, "Replaces")) { | |
563 | if (event_flags) | |
564 | *event_flags |= metadata_flag; | |
565 | av_dict_set(metadata, name, str_value, 0); | |
566 | } | |
567 | } | |
568 | } | |
569 | ||
570 | if (skip_reserved(bc, end) || ffio_get_checksum(bc)) { | |
571 | av_log(s, AV_LOG_ERROR, "info header checksum mismatch\n"); | |
572 | return AVERROR_INVALIDDATA; | |
573 | } | |
574 | return 0; | |
575 | } | |
576 | ||
577 | static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr) | |
578 | { | |
579 | AVFormatContext *s = nut->avf; | |
580 | AVIOContext *bc = s->pb; | |
581 | int64_t end; | |
582 | uint64_t tmp; | |
583 | int ret; | |
584 | ||
585 | nut->last_syncpoint_pos = avio_tell(bc) - 8; | |
586 | ||
587 | end = get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE); | |
588 | end += avio_tell(bc); | |
589 | ||
590 | tmp = ffio_read_varlen(bc); | |
591 | *back_ptr = nut->last_syncpoint_pos - 16 * ffio_read_varlen(bc); | |
592 | if (*back_ptr < 0) | |
593 | return AVERROR_INVALIDDATA; | |
594 | ||
595 | ff_nut_reset_ts(nut, nut->time_base[tmp % nut->time_base_count], | |
596 | tmp / nut->time_base_count); | |
597 | ||
598 | if (nut->flags & NUT_BROADCAST) { | |
599 | tmp = ffio_read_varlen(bc); | |
600 | av_log(s, AV_LOG_VERBOSE, "Syncpoint wallclock %"PRId64"\n", | |
601 | av_rescale_q(tmp / nut->time_base_count, | |
602 | nut->time_base[tmp % nut->time_base_count], | |
603 | AV_TIME_BASE_Q)); | |
604 | } | |
605 | ||
606 | if (skip_reserved(bc, end) || ffio_get_checksum(bc)) { | |
607 | av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n"); | |
608 | return AVERROR_INVALIDDATA; | |
609 | } | |
610 | ||
611 | *ts = tmp / nut->time_base_count * | |
612 | av_q2d(nut->time_base[tmp % nut->time_base_count]) * AV_TIME_BASE; | |
613 | ||
614 | if ((ret = ff_nut_add_sp(nut, nut->last_syncpoint_pos, *back_ptr, *ts)) < 0) | |
615 | return ret; | |
616 | ||
617 | return 0; | |
618 | } | |
619 | ||
620 | //FIXME calculate exactly, this is just a good approximation. | |
621 | static int64_t find_duration(NUTContext *nut, int64_t filesize) | |
622 | { | |
623 | AVFormatContext *s = nut->avf; | |
624 | int64_t duration = 0; | |
625 | ||
626 | ff_find_last_ts(s, -1, &duration, NULL, nut_read_timestamp); | |
627 | ||
628 | if(duration > 0) | |
629 | s->duration_estimation_method = AVFMT_DURATION_FROM_PTS; | |
630 | return duration; | |
631 | } | |
632 | ||
633 | static int find_and_decode_index(NUTContext *nut) | |
634 | { | |
635 | AVFormatContext *s = nut->avf; | |
636 | AVIOContext *bc = s->pb; | |
637 | uint64_t tmp, end; | |
638 | int i, j, syncpoint_count; | |
639 | int64_t filesize = avio_size(bc); | |
640 | int64_t *syncpoints; | |
641 | uint64_t max_pts; | |
642 | int8_t *has_keyframe; | |
643 | int ret = AVERROR_INVALIDDATA; | |
644 | ||
645 | if(filesize <= 0) | |
646 | return -1; | |
647 | ||
648 | avio_seek(bc, filesize - 12, SEEK_SET); | |
649 | avio_seek(bc, filesize - avio_rb64(bc), SEEK_SET); | |
650 | if (avio_rb64(bc) != INDEX_STARTCODE) { | |
651 | av_log(s, AV_LOG_ERROR, "no index at the end\n"); | |
652 | ||
653 | if(s->duration<=0) | |
654 | s->duration = find_duration(nut, filesize); | |
655 | return ret; | |
656 | } | |
657 | ||
658 | end = get_packetheader(nut, bc, 1, INDEX_STARTCODE); | |
659 | end += avio_tell(bc); | |
660 | ||
661 | max_pts = ffio_read_varlen(bc); | |
662 | s->duration = av_rescale_q(max_pts / nut->time_base_count, | |
663 | nut->time_base[max_pts % nut->time_base_count], | |
664 | AV_TIME_BASE_Q); | |
665 | s->duration_estimation_method = AVFMT_DURATION_FROM_PTS; | |
666 | ||
667 | GET_V(syncpoint_count, tmp < INT_MAX / 8 && tmp > 0); | |
668 | syncpoints = av_malloc_array(syncpoint_count, sizeof(int64_t)); | |
669 | has_keyframe = av_malloc_array(syncpoint_count + 1, sizeof(int8_t)); | |
670 | if (!syncpoints || !has_keyframe) { | |
671 | ret = AVERROR(ENOMEM); | |
672 | goto fail; | |
673 | } | |
674 | for (i = 0; i < syncpoint_count; i++) { | |
675 | syncpoints[i] = ffio_read_varlen(bc); | |
676 | if (syncpoints[i] <= 0) | |
677 | goto fail; | |
678 | if (i) | |
679 | syncpoints[i] += syncpoints[i - 1]; | |
680 | } | |
681 | ||
682 | for (i = 0; i < s->nb_streams; i++) { | |
683 | int64_t last_pts = -1; | |
684 | for (j = 0; j < syncpoint_count;) { | |
685 | uint64_t x = ffio_read_varlen(bc); | |
686 | int type = x & 1; | |
687 | int n = j; | |
688 | x >>= 1; | |
689 | if (type) { | |
690 | int flag = x & 1; | |
691 | x >>= 1; | |
692 | if (n + x >= syncpoint_count + 1) { | |
693 | av_log(s, AV_LOG_ERROR, "index overflow A %d + %"PRIu64" >= %d\n", n, x, syncpoint_count + 1); | |
694 | goto fail; | |
695 | } | |
696 | while (x--) | |
697 | has_keyframe[n++] = flag; | |
698 | has_keyframe[n++] = !flag; | |
699 | } else { | |
700 | while (x != 1) { | |
701 | if (n >= syncpoint_count + 1) { | |
702 | av_log(s, AV_LOG_ERROR, "index overflow B\n"); | |
703 | goto fail; | |
704 | } | |
705 | has_keyframe[n++] = x & 1; | |
706 | x >>= 1; | |
707 | } | |
708 | } | |
709 | if (has_keyframe[0]) { | |
710 | av_log(s, AV_LOG_ERROR, "keyframe before first syncpoint in index\n"); | |
711 | goto fail; | |
712 | } | |
713 | av_assert0(n <= syncpoint_count + 1); | |
714 | for (; j < n && j < syncpoint_count; j++) { | |
715 | if (has_keyframe[j]) { | |
716 | uint64_t B, A = ffio_read_varlen(bc); | |
717 | if (!A) { | |
718 | A = ffio_read_varlen(bc); | |
719 | B = ffio_read_varlen(bc); | |
720 | // eor_pts[j][i] = last_pts + A + B | |
721 | } else | |
722 | B = 0; | |
723 | av_add_index_entry(s->streams[i], 16 * syncpoints[j - 1], | |
724 | last_pts + A, 0, 0, AVINDEX_KEYFRAME); | |
725 | last_pts += A + B; | |
726 | } | |
727 | } | |
728 | } | |
729 | } | |
730 | ||
731 | if (skip_reserved(bc, end) || ffio_get_checksum(bc)) { | |
732 | av_log(s, AV_LOG_ERROR, "index checksum mismatch\n"); | |
733 | goto fail; | |
734 | } | |
735 | ret = 0; | |
736 | ||
737 | fail: | |
738 | av_free(syncpoints); | |
739 | av_free(has_keyframe); | |
740 | return ret; | |
741 | } | |
742 | ||
743 | static int nut_read_header(AVFormatContext *s) | |
744 | { | |
745 | NUTContext *nut = s->priv_data; | |
746 | AVIOContext *bc = s->pb; | |
747 | int64_t pos; | |
748 | int initialized_stream_count; | |
749 | ||
750 | nut->avf = s; | |
751 | ||
752 | /* main header */ | |
753 | pos = 0; | |
754 | do { | |
755 | pos = find_startcode(bc, MAIN_STARTCODE, pos) + 1; | |
756 | if (pos < 0 + 1) { | |
757 | av_log(s, AV_LOG_ERROR, "No main startcode found.\n"); | |
758 | return AVERROR_INVALIDDATA; | |
759 | } | |
760 | } while (decode_main_header(nut) < 0); | |
761 | ||
762 | /* stream headers */ | |
763 | pos = 0; | |
764 | for (initialized_stream_count = 0; initialized_stream_count < s->nb_streams;) { | |
765 | pos = find_startcode(bc, STREAM_STARTCODE, pos) + 1; | |
766 | if (pos < 0 + 1) { | |
767 | av_log(s, AV_LOG_ERROR, "Not all stream headers found.\n"); | |
768 | return AVERROR_INVALIDDATA; | |
769 | } | |
770 | if (decode_stream_header(nut) >= 0) | |
771 | initialized_stream_count++; | |
772 | } | |
773 | ||
774 | /* info headers */ | |
775 | pos = 0; | |
776 | for (;;) { | |
777 | uint64_t startcode = find_any_startcode(bc, pos); | |
778 | pos = avio_tell(bc); | |
779 | ||
780 | if (startcode == 0) { | |
781 | av_log(s, AV_LOG_ERROR, "EOF before video frames\n"); | |
782 | return AVERROR_INVALIDDATA; | |
783 | } else if (startcode == SYNCPOINT_STARTCODE) { | |
784 | nut->next_startcode = startcode; | |
785 | break; | |
786 | } else if (startcode != INFO_STARTCODE) { | |
787 | continue; | |
788 | } | |
789 | ||
790 | decode_info_header(nut); | |
791 | } | |
792 | ||
793 | s->data_offset = pos - 8; | |
794 | ||
795 | if (bc->seekable) { | |
796 | int64_t orig_pos = avio_tell(bc); | |
797 | find_and_decode_index(nut); | |
798 | avio_seek(bc, orig_pos, SEEK_SET); | |
799 | } | |
800 | av_assert0(nut->next_startcode == SYNCPOINT_STARTCODE); | |
801 | ||
802 | ff_metadata_conv_ctx(s, NULL, ff_nut_metadata_conv); | |
803 | ||
804 | return 0; | |
805 | } | |
806 | ||
807 | static int read_sm_data(AVFormatContext *s, AVIOContext *bc, AVPacket *pkt, int is_meta, int64_t maxpos) | |
808 | { | |
809 | int count = ffio_read_varlen(bc); | |
810 | int skip_start = 0; | |
811 | int skip_end = 0; | |
812 | int channels = 0; | |
813 | int64_t channel_layout = 0; | |
814 | int sample_rate = 0; | |
815 | int width = 0; | |
816 | int height = 0; | |
817 | int i; | |
818 | ||
819 | for (i=0; i<count; i++) { | |
820 | uint8_t name[256], str_value[256], type_str[256]; | |
821 | int value; | |
822 | if (avio_tell(bc) >= maxpos) | |
823 | return AVERROR_INVALIDDATA; | |
824 | get_str(bc, name, sizeof(name)); | |
825 | value = get_s(bc); | |
826 | ||
827 | if (value == -1) { | |
828 | get_str(bc, str_value, sizeof(str_value)); | |
829 | av_log(s, AV_LOG_WARNING, "Unknown string %s / %s\n", name, str_value); | |
830 | } else if (value == -2) { | |
831 | uint8_t *dst = NULL; | |
832 | int64_t v64, value_len; | |
833 | ||
834 | get_str(bc, type_str, sizeof(type_str)); | |
835 | value_len = ffio_read_varlen(bc); | |
836 | if (avio_tell(bc) + value_len >= maxpos) | |
837 | return AVERROR_INVALIDDATA; | |
838 | if (!strcmp(name, "Palette")) { | |
839 | dst = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, value_len); | |
840 | } else if (!strcmp(name, "Extradata")) { | |
841 | dst = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, value_len); | |
842 | } else if (sscanf(name, "CodecSpecificSide%"SCNd64"", &v64) == 1) { | |
843 | dst = av_packet_new_side_data(pkt, AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL, value_len + 8); | |
844 | if(!dst) | |
845 | return AVERROR(ENOMEM); | |
846 | AV_WB64(dst, v64); | |
847 | dst += 8; | |
848 | } else if (!strcmp(name, "ChannelLayout") && value_len == 8) { | |
849 | channel_layout = avio_rl64(bc); | |
850 | continue; | |
851 | } else { | |
852 | av_log(s, AV_LOG_WARNING, "Unknown data %s / %s\n", name, type_str); | |
853 | avio_skip(bc, value_len); | |
854 | continue; | |
855 | } | |
856 | if(!dst) | |
857 | return AVERROR(ENOMEM); | |
858 | avio_read(bc, dst, value_len); | |
859 | } else if (value == -3) { | |
860 | value = get_s(bc); | |
861 | } else if (value == -4) { | |
862 | value = ffio_read_varlen(bc); | |
863 | } else if (value < -4) { | |
864 | get_s(bc); | |
865 | } else { | |
866 | if (!strcmp(name, "SkipStart")) { | |
867 | skip_start = value; | |
868 | } else if (!strcmp(name, "SkipEnd")) { | |
869 | skip_end = value; | |
870 | } else if (!strcmp(name, "Channels")) { | |
871 | channels = value; | |
872 | } else if (!strcmp(name, "SampleRate")) { | |
873 | sample_rate = value; | |
874 | } else if (!strcmp(name, "Width")) { | |
875 | width = value; | |
876 | } else if (!strcmp(name, "Height")) { | |
877 | height = value; | |
878 | } else { | |
879 | av_log(s, AV_LOG_WARNING, "Unknown integer %s\n", name); | |
880 | } | |
881 | } | |
882 | } | |
883 | ||
884 | if (channels || channel_layout || sample_rate || width || height) { | |
885 | uint8_t *dst = av_packet_new_side_data(pkt, AV_PKT_DATA_PARAM_CHANGE, 28); | |
886 | if (!dst) | |
887 | return AVERROR(ENOMEM); | |
888 | bytestream_put_le32(&dst, | |
889 | AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT*(!!channels) + | |
890 | AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT*(!!channel_layout) + | |
891 | AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE*(!!sample_rate) + | |
892 | AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS*(!!(width|height)) | |
893 | ); | |
894 | if (channels) | |
895 | bytestream_put_le32(&dst, channels); | |
896 | if (channel_layout) | |
897 | bytestream_put_le64(&dst, channel_layout); | |
898 | if (sample_rate) | |
899 | bytestream_put_le32(&dst, sample_rate); | |
900 | if (width || height){ | |
901 | bytestream_put_le32(&dst, width); | |
902 | bytestream_put_le32(&dst, height); | |
903 | } | |
904 | } | |
905 | ||
906 | if (skip_start || skip_end) { | |
907 | uint8_t *dst = av_packet_new_side_data(pkt, AV_PKT_DATA_SKIP_SAMPLES, 10); | |
908 | if (!dst) | |
909 | return AVERROR(ENOMEM); | |
910 | AV_WL32(dst, skip_start); | |
911 | AV_WL32(dst+4, skip_end); | |
912 | } | |
913 | ||
914 | return 0; | |
915 | } | |
916 | ||
917 | static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id, | |
918 | uint8_t *header_idx, int frame_code) | |
919 | { | |
920 | AVFormatContext *s = nut->avf; | |
921 | AVIOContext *bc = s->pb; | |
922 | StreamContext *stc; | |
923 | int size, flags, size_mul, pts_delta, i, reserved_count; | |
924 | uint64_t tmp; | |
925 | ||
926 | if (!(nut->flags & NUT_PIPE) && | |
927 | avio_tell(bc) > nut->last_syncpoint_pos + nut->max_distance) { | |
928 | av_log(s, AV_LOG_ERROR, | |
929 | "Last frame must have been damaged %"PRId64" > %"PRId64" + %d\n", | |
930 | avio_tell(bc), nut->last_syncpoint_pos, nut->max_distance); | |
931 | return AVERROR_INVALIDDATA; | |
932 | } | |
933 | ||
934 | flags = nut->frame_code[frame_code].flags; | |
935 | size_mul = nut->frame_code[frame_code].size_mul; | |
936 | size = nut->frame_code[frame_code].size_lsb; | |
937 | *stream_id = nut->frame_code[frame_code].stream_id; | |
938 | pts_delta = nut->frame_code[frame_code].pts_delta; | |
939 | reserved_count = nut->frame_code[frame_code].reserved_count; | |
940 | *header_idx = nut->frame_code[frame_code].header_idx; | |
941 | ||
942 | if (flags & FLAG_INVALID) | |
943 | return AVERROR_INVALIDDATA; | |
944 | if (flags & FLAG_CODED) | |
945 | flags ^= ffio_read_varlen(bc); | |
946 | if (flags & FLAG_STREAM_ID) { | |
947 | GET_V(*stream_id, tmp < s->nb_streams); | |
948 | } | |
949 | stc = &nut->stream[*stream_id]; | |
950 | if (flags & FLAG_CODED_PTS) { | |
951 | int coded_pts = ffio_read_varlen(bc); | |
952 | // FIXME check last_pts validity? | |
953 | if (coded_pts < (1 << stc->msb_pts_shift)) { | |
954 | *pts = ff_lsb2full(stc, coded_pts); | |
955 | } else | |
956 | *pts = coded_pts - (1LL << stc->msb_pts_shift); | |
957 | } else | |
958 | *pts = stc->last_pts + pts_delta; | |
959 | if (flags & FLAG_SIZE_MSB) | |
960 | size += size_mul * ffio_read_varlen(bc); | |
961 | if (flags & FLAG_MATCH_TIME) | |
962 | get_s(bc); | |
963 | if (flags & FLAG_HEADER_IDX) | |
964 | *header_idx = ffio_read_varlen(bc); | |
965 | if (flags & FLAG_RESERVED) | |
966 | reserved_count = ffio_read_varlen(bc); | |
967 | for (i = 0; i < reserved_count; i++) | |
968 | ffio_read_varlen(bc); | |
969 | ||
970 | if (*header_idx >= (unsigned)nut->header_count) { | |
971 | av_log(s, AV_LOG_ERROR, "header_idx invalid\n"); | |
972 | return AVERROR_INVALIDDATA; | |
973 | } | |
974 | if (size > 4096) | |
975 | *header_idx = 0; | |
976 | size -= nut->header_len[*header_idx]; | |
977 | ||
978 | if (flags & FLAG_CHECKSUM) { | |
979 | avio_rb32(bc); // FIXME check this | |
980 | } else if (!(nut->flags & NUT_PIPE) && | |
981 | size > 2 * nut->max_distance || | |
982 | FFABS(stc->last_pts - *pts) > stc->max_pts_distance) { | |
983 | av_log(s, AV_LOG_ERROR, "frame size > 2max_distance and no checksum\n"); | |
984 | return AVERROR_INVALIDDATA; | |
985 | } | |
986 | ||
987 | stc->last_pts = *pts; | |
988 | stc->last_flags = flags; | |
989 | ||
990 | return size; | |
991 | } | |
992 | ||
993 | static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code) | |
994 | { | |
995 | AVFormatContext *s = nut->avf; | |
996 | AVIOContext *bc = s->pb; | |
f6fa7814 | 997 | int size, stream_id, discard, ret; |
2ba45a60 DM |
998 | int64_t pts, last_IP_pts; |
999 | StreamContext *stc; | |
1000 | uint8_t header_idx; | |
2ba45a60 DM |
1001 | |
1002 | size = decode_frame_header(nut, &pts, &stream_id, &header_idx, frame_code); | |
1003 | if (size < 0) | |
1004 | return size; | |
1005 | ||
1006 | stc = &nut->stream[stream_id]; | |
1007 | ||
1008 | if (stc->last_flags & FLAG_KEY) | |
1009 | stc->skip_until_key_frame = 0; | |
1010 | ||
1011 | discard = s->streams[stream_id]->discard; | |
1012 | last_IP_pts = s->streams[stream_id]->last_IP_pts; | |
1013 | if ((discard >= AVDISCARD_NONKEY && !(stc->last_flags & FLAG_KEY)) || | |
1014 | (discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE && | |
1015 | last_IP_pts > pts) || | |
1016 | discard >= AVDISCARD_ALL || | |
1017 | stc->skip_until_key_frame) { | |
1018 | avio_skip(bc, size); | |
1019 | return 1; | |
1020 | } | |
1021 | ||
f6fa7814 DM |
1022 | ret = av_new_packet(pkt, size + nut->header_len[header_idx]); |
1023 | if (ret < 0) | |
1024 | return ret; | |
2ba45a60 DM |
1025 | memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]); |
1026 | pkt->pos = avio_tell(bc); // FIXME | |
1027 | if (stc->last_flags & FLAG_SM_DATA) { | |
1028 | int sm_size; | |
1029 | if (read_sm_data(s, bc, pkt, 0, pkt->pos + size) < 0) | |
1030 | return AVERROR_INVALIDDATA; | |
1031 | if (read_sm_data(s, bc, pkt, 1, pkt->pos + size) < 0) | |
1032 | return AVERROR_INVALIDDATA; | |
1033 | sm_size = avio_tell(bc) - pkt->pos; | |
1034 | size -= sm_size; | |
1035 | pkt->size -= sm_size; | |
1036 | } | |
1037 | ||
1038 | ret = avio_read(bc, pkt->data + nut->header_len[header_idx], size); | |
1039 | if (ret != size) { | |
1040 | if (ret < 0) | |
1041 | return ret; | |
1042 | } | |
1043 | av_shrink_packet(pkt, nut->header_len[header_idx] + ret); | |
1044 | ||
1045 | pkt->stream_index = stream_id; | |
1046 | if (stc->last_flags & FLAG_KEY) | |
1047 | pkt->flags |= AV_PKT_FLAG_KEY; | |
1048 | pkt->pts = pts; | |
1049 | ||
1050 | return 0; | |
1051 | } | |
1052 | ||
1053 | static int nut_read_packet(AVFormatContext *s, AVPacket *pkt) | |
1054 | { | |
1055 | NUTContext *nut = s->priv_data; | |
1056 | AVIOContext *bc = s->pb; | |
1057 | int i, frame_code = 0, ret, skip; | |
1058 | int64_t ts, back_ptr; | |
1059 | ||
1060 | for (;;) { | |
1061 | int64_t pos = avio_tell(bc); | |
1062 | uint64_t tmp = nut->next_startcode; | |
1063 | nut->next_startcode = 0; | |
1064 | ||
1065 | if (tmp) { | |
1066 | pos -= 8; | |
1067 | } else { | |
1068 | frame_code = avio_r8(bc); | |
1069 | if (avio_feof(bc)) | |
1070 | return AVERROR_EOF; | |
1071 | if (frame_code == 'N') { | |
1072 | tmp = frame_code; | |
1073 | for (i = 1; i < 8; i++) | |
1074 | tmp = (tmp << 8) + avio_r8(bc); | |
1075 | } | |
1076 | } | |
1077 | switch (tmp) { | |
1078 | case MAIN_STARTCODE: | |
1079 | case STREAM_STARTCODE: | |
1080 | case INDEX_STARTCODE: | |
1081 | skip = get_packetheader(nut, bc, 0, tmp); | |
1082 | avio_skip(bc, skip); | |
1083 | break; | |
1084 | case INFO_STARTCODE: | |
1085 | if (decode_info_header(nut) < 0) | |
1086 | goto resync; | |
1087 | break; | |
1088 | case SYNCPOINT_STARTCODE: | |
1089 | if (decode_syncpoint(nut, &ts, &back_ptr) < 0) | |
1090 | goto resync; | |
1091 | frame_code = avio_r8(bc); | |
1092 | case 0: | |
1093 | ret = decode_frame(nut, pkt, frame_code); | |
1094 | if (ret == 0) | |
1095 | return 0; | |
1096 | else if (ret == 1) // OK but discard packet | |
1097 | break; | |
1098 | default: | |
1099 | resync: | |
1100 | av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", pos); | |
1101 | tmp = find_any_startcode(bc, nut->last_syncpoint_pos + 1); | |
1102 | if (tmp == 0) | |
1103 | return AVERROR_INVALIDDATA; | |
1104 | av_log(s, AV_LOG_DEBUG, "sync\n"); | |
1105 | nut->next_startcode = tmp; | |
1106 | } | |
1107 | } | |
1108 | } | |
1109 | ||
1110 | static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index, | |
1111 | int64_t *pos_arg, int64_t pos_limit) | |
1112 | { | |
1113 | NUTContext *nut = s->priv_data; | |
1114 | AVIOContext *bc = s->pb; | |
1115 | int64_t pos, pts, back_ptr; | |
1116 | av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n", | |
1117 | stream_index, *pos_arg, pos_limit); | |
1118 | ||
1119 | pos = *pos_arg; | |
1120 | do { | |
1121 | pos = find_startcode(bc, SYNCPOINT_STARTCODE, pos) + 1; | |
1122 | if (pos < 1) { | |
1123 | av_log(s, AV_LOG_ERROR, "read_timestamp failed.\n"); | |
1124 | return AV_NOPTS_VALUE; | |
1125 | } | |
1126 | } while (decode_syncpoint(nut, &pts, &back_ptr) < 0); | |
1127 | *pos_arg = pos - 1; | |
1128 | av_assert0(nut->last_syncpoint_pos == *pos_arg); | |
1129 | ||
1130 | av_log(s, AV_LOG_DEBUG, "return %"PRId64" %"PRId64"\n", pts, back_ptr); | |
1131 | if (stream_index == -2) | |
1132 | return back_ptr; | |
1133 | av_assert0(stream_index == -1); | |
1134 | return pts; | |
1135 | } | |
1136 | ||
1137 | static int read_seek(AVFormatContext *s, int stream_index, | |
1138 | int64_t pts, int flags) | |
1139 | { | |
1140 | NUTContext *nut = s->priv_data; | |
1141 | AVStream *st = s->streams[stream_index]; | |
1142 | Syncpoint dummy = { .ts = pts * av_q2d(st->time_base) * AV_TIME_BASE }; | |
1143 | Syncpoint nopts_sp = { .ts = AV_NOPTS_VALUE, .back_ptr = AV_NOPTS_VALUE }; | |
1144 | Syncpoint *sp, *next_node[2] = { &nopts_sp, &nopts_sp }; | |
1145 | int64_t pos, pos2, ts; | |
1146 | int i; | |
1147 | ||
1148 | if (nut->flags & NUT_PIPE) { | |
1149 | return AVERROR(ENOSYS); | |
1150 | } | |
1151 | ||
1152 | if (st->index_entries) { | |
1153 | int index = av_index_search_timestamp(st, pts, flags); | |
1154 | if (index < 0) | |
1155 | index = av_index_search_timestamp(st, pts, flags ^ AVSEEK_FLAG_BACKWARD); | |
1156 | if (index < 0) | |
1157 | return -1; | |
1158 | ||
1159 | pos2 = st->index_entries[index].pos; | |
1160 | ts = st->index_entries[index].timestamp; | |
1161 | } else { | |
1162 | av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pts_cmp, | |
1163 | (void **) next_node); | |
1164 | av_log(s, AV_LOG_DEBUG, "%"PRIu64"-%"PRIu64" %"PRId64"-%"PRId64"\n", | |
1165 | next_node[0]->pos, next_node[1]->pos, next_node[0]->ts, | |
1166 | next_node[1]->ts); | |
1167 | pos = ff_gen_search(s, -1, dummy.ts, next_node[0]->pos, | |
1168 | next_node[1]->pos, next_node[1]->pos, | |
1169 | next_node[0]->ts, next_node[1]->ts, | |
1170 | AVSEEK_FLAG_BACKWARD, &ts, nut_read_timestamp); | |
1171 | ||
1172 | if (!(flags & AVSEEK_FLAG_BACKWARD)) { | |
1173 | dummy.pos = pos + 16; | |
1174 | next_node[1] = &nopts_sp; | |
1175 | av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp, | |
1176 | (void **) next_node); | |
1177 | pos2 = ff_gen_search(s, -2, dummy.pos, next_node[0]->pos, | |
1178 | next_node[1]->pos, next_node[1]->pos, | |
1179 | next_node[0]->back_ptr, next_node[1]->back_ptr, | |
1180 | flags, &ts, nut_read_timestamp); | |
1181 | if (pos2 >= 0) | |
1182 | pos = pos2; | |
1183 | // FIXME dir but I think it does not matter | |
1184 | } | |
1185 | dummy.pos = pos; | |
1186 | sp = av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp, | |
1187 | NULL); | |
1188 | ||
1189 | av_assert0(sp); | |
1190 | pos2 = sp->back_ptr - 15; | |
1191 | } | |
1192 | av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos2); | |
1193 | pos = find_startcode(s->pb, SYNCPOINT_STARTCODE, pos2); | |
1194 | avio_seek(s->pb, pos, SEEK_SET); | |
1195 | av_log(NULL, AV_LOG_DEBUG, "SP: %"PRId64"\n", pos); | |
1196 | if (pos2 > pos || pos2 + 15 < pos) | |
1197 | av_log(NULL, AV_LOG_ERROR, "no syncpoint at backptr pos\n"); | |
1198 | for (i = 0; i < s->nb_streams; i++) | |
1199 | nut->stream[i].skip_until_key_frame = 1; | |
1200 | ||
1201 | return 0; | |
1202 | } | |
1203 | ||
1204 | static int nut_read_close(AVFormatContext *s) | |
1205 | { | |
1206 | NUTContext *nut = s->priv_data; | |
1207 | int i; | |
1208 | ||
1209 | av_freep(&nut->time_base); | |
1210 | av_freep(&nut->stream); | |
1211 | ff_nut_free_sp(nut); | |
1212 | for (i = 1; i < nut->header_count; i++) | |
1213 | av_freep(&nut->header[i]); | |
1214 | ||
1215 | return 0; | |
1216 | } | |
1217 | ||
1218 | AVInputFormat ff_nut_demuxer = { | |
1219 | .name = "nut", | |
1220 | .long_name = NULL_IF_CONFIG_SMALL("NUT"), | |
1221 | .flags = AVFMT_SEEK_TO_PTS, | |
1222 | .priv_data_size = sizeof(NUTContext), | |
1223 | .read_probe = nut_probe, | |
1224 | .read_header = nut_read_header, | |
1225 | .read_packet = nut_read_packet, | |
1226 | .read_close = nut_read_close, | |
1227 | .read_seek = read_seek, | |
1228 | .extensions = "nut", | |
1229 | .codec_tag = ff_nut_codec_tags, | |
1230 | }; |