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1/*
2 * NSV demuxer
3 * Copyright (c) 2004 The FFmpeg Project
4 *
5 * first version by Francois Revol <revol@free.fr>
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#include "libavutil/attributes.h"
25#include "libavutil/mathematics.h"
26#include "avformat.h"
27#include "internal.h"
28#include "libavutil/dict.h"
29#include "libavutil/intreadwrite.h"
30
31/* max bytes to crawl for trying to resync
32 * stupid streaming servers don't start at chunk boundaries...
33 */
34#define NSV_MAX_RESYNC (500*1024)
35#define NSV_MAX_RESYNC_TRIES 300
36
37/*
38 * References:
39 * (1) http://www.multimedia.cx/nsv-format.txt
40 * seems someone came to the same conclusions as me, and updated it:
41 * (2) http://www.stud.ktu.lt/~vitslav/nsv/nsv-format.txt
42 * http://www.stud.ktu.lt/~vitslav/nsv/
43 * official docs
44 * (3) http://ultravox.aol.com/NSVFormat.rtf
45 * Sample files:
46 * (S1) http://www.nullsoft.com/nsv/samples/
47 * http://www.nullsoft.com/nsv/samples/faster.nsv
48 * http://streamripper.sourceforge.net/openbb/read.php?TID=492&page=4
49 */
50
51/*
52 * notes on the header (Francois Revol):
53 *
54 * It is followed by strings, then a table, but nothing tells
55 * where the table begins according to (1). After checking faster.nsv,
56 * I believe NVSf[16-19] gives the size of the strings data
57 * (that is the offset of the data table after the header).
58 * After checking all samples from (S1) all confirms this.
59 *
60 * Then, about NSVf[12-15], faster.nsf has 179700. When viewing it in VLC,
61 * I noticed there was about 1 NVSs chunk/s, so I ran
62 * strings faster.nsv | grep NSVs | wc -l
63 * which gave me 180. That leads me to think that NSVf[12-15] might be the
64 * file length in milliseconds.
65 * Let's try that:
66 * for f in *.nsv; do HTIME="$(od -t x4 "$f" | head -1 | sed 's/.* //')"; echo "'$f' $((0x$HTIME))s = $((0x$HTIME/1000/60)):$((0x$HTIME/1000%60))"; done
67 * except for nsvtrailer (which doesn't have an NSVf header), it reports correct time.
68 *
69 * nsvtrailer.nsv (S1) does not have any NSVf header, only NSVs chunks,
70 * so the header seems to not be mandatory. (for streaming).
71 *
72 * index slice duration check (excepts nsvtrailer.nsv):
73 * for f in [^n]*.nsv; do DUR="$(ffmpeg -i "$f" 2>/dev/null | grep 'NSVf duration' | cut -d ' ' -f 4)"; IC="$(ffmpeg -i "$f" 2>/dev/null | grep 'INDEX ENTRIES' | cut -d ' ' -f 2)"; echo "duration $DUR, slite time $(($DUR/$IC))"; done
74 */
75
76/*
77 * TODO:
78 * - handle timestamps !!!
79 * - use index
80 * - mime-type in probe()
81 * - seek
82 */
83
84#if 0
85struct NSVf_header {
86 uint32_t chunk_tag; /* 'NSVf' */
87 uint32_t chunk_size;
88 uint32_t file_size; /* max 4GB ??? no one learns anything it seems :^) */
89 uint32_t file_length; //unknown1; /* what about MSB of file_size ? */
90 uint32_t info_strings_size; /* size of the info strings */ //unknown2;
91 uint32_t table_entries;
92 uint32_t table_entries_used; /* the left ones should be -1 */
93};
94
95struct NSVs_header {
96 uint32_t chunk_tag; /* 'NSVs' */
97 uint32_t v4cc; /* or 'NONE' */
98 uint32_t a4cc; /* or 'NONE' */
99 uint16_t vwidth; /* av_assert0(vwidth%16==0) */
100 uint16_t vheight; /* av_assert0(vheight%16==0) */
101 uint8_t framerate; /* value = (framerate&0x80)?frtable[frameratex0x7f]:framerate */
102 uint16_t unknown;
103};
104
105struct nsv_avchunk_header {
106 uint8_t vchunk_size_lsb;
107 uint16_t vchunk_size_msb; /* value = (vchunk_size_msb << 4) | (vchunk_size_lsb >> 4) */
108 uint16_t achunk_size;
109};
110
111struct nsv_pcm_header {
112 uint8_t bits_per_sample;
113 uint8_t channel_count;
114 uint16_t sample_rate;
115};
116#endif
117
118/* variation from avi.h */
119/*typedef struct CodecTag {
120 int id;
121 unsigned int tag;
122} CodecTag;*/
123
124/* tags */
125
126#define T_NSVF MKTAG('N', 'S', 'V', 'f') /* file header */
127#define T_NSVS MKTAG('N', 'S', 'V', 's') /* chunk header */
128#define T_TOC2 MKTAG('T', 'O', 'C', '2') /* extra index marker */
129#define T_NONE MKTAG('N', 'O', 'N', 'E') /* null a/v 4CC */
130#define T_SUBT MKTAG('S', 'U', 'B', 'T') /* subtitle aux data */
131#define T_ASYN MKTAG('A', 'S', 'Y', 'N') /* async a/v aux marker */
132#define T_KEYF MKTAG('K', 'E', 'Y', 'F') /* video keyframe aux marker (addition) */
133
134#define TB_NSVF MKBETAG('N', 'S', 'V', 'f')
135#define TB_NSVS MKBETAG('N', 'S', 'V', 's')
136
137/* hardcoded stream indexes */
138#define NSV_ST_VIDEO 0
139#define NSV_ST_AUDIO 1
140#define NSV_ST_SUBT 2
141
142enum NSVStatus {
143 NSV_UNSYNC,
144 NSV_FOUND_NSVF,
145 NSV_HAS_READ_NSVF,
146 NSV_FOUND_NSVS,
147 NSV_HAS_READ_NSVS,
148 NSV_FOUND_BEEF,
149 NSV_GOT_VIDEO,
150 NSV_GOT_AUDIO,
151};
152
153typedef struct NSVStream {
154 int frame_offset; /* current frame (video) or byte (audio) counter
155 (used to compute the pts) */
156 int scale;
157 int rate;
158 int sample_size; /* audio only data */
159 int start;
160
161 int new_frame_offset; /* temporary storage (used during seek) */
162 int cum_len; /* temporary storage (used during seek) */
163} NSVStream;
164
165typedef struct NSVContext {
166 int base_offset;
167 int NSVf_end;
168 uint32_t *nsvs_file_offset;
169 int index_entries;
170 enum NSVStatus state;
171 AVPacket ahead[2]; /* [v, a] if .data is !NULL there is something */
172 /* cached */
173 int64_t duration;
174 uint32_t vtag, atag;
175 uint16_t vwidth, vheight;
176 int16_t avsync;
177 AVRational framerate;
178 uint32_t *nsvs_timestamps;
179} NSVContext;
180
181static const AVCodecTag nsv_codec_video_tags[] = {
182 { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') },
183 { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
184 { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
185 { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') },
186 { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
187 { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') },
188 { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') },
189 { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') },
190 { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
191 { AV_CODEC_ID_VP8, MKTAG('V', 'P', '8', '0') },
192/*
193 { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') },
194 { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') },
195*/
196 { AV_CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */
197 { AV_CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') },
198 { AV_CODEC_ID_NONE, 0 },
199};
200
201static const AVCodecTag nsv_codec_audio_tags[] = {
202 { AV_CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') },
203 { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'C', ' ') },
204 { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'C', 'P') },
205 { AV_CODEC_ID_AAC, MKTAG('V', 'L', 'B', ' ') },
206 { AV_CODEC_ID_SPEEX, MKTAG('S', 'P', 'X', ' ') },
207 { AV_CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') },
208 { AV_CODEC_ID_NONE, 0 },
209};
210
211//static int nsv_load_index(AVFormatContext *s);
212static int nsv_read_chunk(AVFormatContext *s, int fill_header);
213
214/* try to find something we recognize, and set the state accordingly */
215static int nsv_resync(AVFormatContext *s)
216{
217 NSVContext *nsv = s->priv_data;
218 AVIOContext *pb = s->pb;
219 uint32_t v = 0;
220 int i;
221
222 for (i = 0; i < NSV_MAX_RESYNC; i++) {
223 if (avio_feof(pb)) {
224 av_log(s, AV_LOG_TRACE, "NSV EOF\n");
225 nsv->state = NSV_UNSYNC;
226 return -1;
227 }
228 v <<= 8;
229 v |= avio_r8(pb);
230 if (i < 8) {
231 av_log(s, AV_LOG_TRACE, "NSV resync: [%d] = %02"PRIx32"\n", i, v & 0x0FF);
232 }
233
234 if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */
235 av_log(s, AV_LOG_TRACE, "NSV resynced on BEEF after %d bytes\n", i+1);
236 nsv->state = NSV_FOUND_BEEF;
237 return 0;
238 }
239 /* we read as big-endian, thus the MK*BE* */
240 if (v == TB_NSVF) { /* NSVf */
241 av_log(s, AV_LOG_TRACE, "NSV resynced on NSVf after %d bytes\n", i+1);
242 nsv->state = NSV_FOUND_NSVF;
243 return 0;
244 }
245 if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */
246 av_log(s, AV_LOG_TRACE, "NSV resynced on NSVs after %d bytes\n", i+1);
247 nsv->state = NSV_FOUND_NSVS;
248 return 0;
249 }
250
251 }
252 av_log(s, AV_LOG_TRACE, "NSV sync lost\n");
253 return -1;
254}
255
256static int nsv_parse_NSVf_header(AVFormatContext *s)
257{
258 NSVContext *nsv = s->priv_data;
259 AVIOContext *pb = s->pb;
260 unsigned int av_unused file_size;
261 unsigned int size;
262 int64_t duration;
263 int strings_size;
264 int table_entries;
265 int table_entries_used;
266
267 nsv->state = NSV_UNSYNC; /* in case we fail */
268
269 size = avio_rl32(pb);
270 if (size < 28)
271 return -1;
272 nsv->NSVf_end = size;
273
274 file_size = (uint32_t)avio_rl32(pb);
275 av_log(s, AV_LOG_TRACE, "NSV NSVf chunk_size %u\n", size);
276 av_log(s, AV_LOG_TRACE, "NSV NSVf file_size %u\n", file_size);
277
278 nsv->duration = duration = avio_rl32(pb); /* in ms */
279 av_log(s, AV_LOG_TRACE, "NSV NSVf duration %"PRId64" ms\n", duration);
280 // XXX: store it in AVStreams
281
282 strings_size = avio_rl32(pb);
283 table_entries = avio_rl32(pb);
284 table_entries_used = avio_rl32(pb);
285 av_log(s, AV_LOG_TRACE, "NSV NSVf info-strings size: %d, table entries: %d, bis %d\n",
286 strings_size, table_entries, table_entries_used);
287 if (avio_feof(pb))
288 return -1;
289
290 av_log(s, AV_LOG_TRACE, "NSV got header; filepos %"PRId64"\n", avio_tell(pb));
291
292 if (strings_size > 0) {
293 char *strings; /* last byte will be '\0' to play safe with str*() */
294 char *p, *endp;
295 char *token, *value;
296 char quote;
297
298 p = strings = av_mallocz((size_t)strings_size + 1);
299 if (!p)
300 return AVERROR(ENOMEM);
301 endp = strings + strings_size;
302 avio_read(pb, strings, strings_size);
303 while (p < endp) {
304 while (*p == ' ')
305 p++; /* strip out spaces */
306 if (p >= endp-2)
307 break;
308 token = p;
309 p = strchr(p, '=');
310 if (!p || p >= endp-2)
311 break;
312 *p++ = '\0';
313 quote = *p++;
314 value = p;
315 p = strchr(p, quote);
316 if (!p || p >= endp)
317 break;
318 *p++ = '\0';
319 av_log(s, AV_LOG_TRACE, "NSV NSVf INFO: %s='%s'\n", token, value);
320 av_dict_set(&s->metadata, token, value, 0);
321 }
322 av_free(strings);
323 }
324 if (avio_feof(pb))
325 return -1;
326
327 av_log(s, AV_LOG_TRACE, "NSV got infos; filepos %"PRId64"\n", avio_tell(pb));
328
329 if (table_entries_used > 0) {
330 int i;
331 nsv->index_entries = table_entries_used;
332 if((unsigned)table_entries_used >= UINT_MAX / sizeof(uint32_t))
333 return -1;
334 nsv->nsvs_file_offset = av_malloc_array((unsigned)table_entries_used, sizeof(uint32_t));
335 if (!nsv->nsvs_file_offset)
336 return AVERROR(ENOMEM);
337
338 for(i=0;i<table_entries_used;i++)
339 nsv->nsvs_file_offset[i] = avio_rl32(pb) + size;
340
341 if(table_entries > table_entries_used &&
342 avio_rl32(pb) == MKTAG('T','O','C','2')) {
343 nsv->nsvs_timestamps = av_malloc_array((unsigned)table_entries_used, sizeof(uint32_t));
344 if (!nsv->nsvs_timestamps)
345 return AVERROR(ENOMEM);
346 for(i=0;i<table_entries_used;i++) {
347 nsv->nsvs_timestamps[i] = avio_rl32(pb);
348 }
349 }
350 }
351
352 av_log(s, AV_LOG_TRACE, "NSV got index; filepos %"PRId64"\n", avio_tell(pb));
353
354 avio_seek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */
355
356 if (avio_feof(pb))
357 return -1;
358 nsv->state = NSV_HAS_READ_NSVF;
359 return 0;
360}
361
362static int nsv_parse_NSVs_header(AVFormatContext *s)
363{
364 NSVContext *nsv = s->priv_data;
365 AVIOContext *pb = s->pb;
366 uint32_t vtag, atag;
367 uint16_t vwidth, vheight;
368 AVRational framerate;
369 int i;
370 AVStream *st;
371 NSVStream *nst;
372
373 vtag = avio_rl32(pb);
374 atag = avio_rl32(pb);
375 vwidth = avio_rl16(pb);
376 vheight = avio_rl16(pb);
377 i = avio_r8(pb);
378
379 av_log(s, AV_LOG_TRACE, "NSV NSVs framerate code %2x\n", i);
380 if(i&0x80) { /* odd way of giving native framerates from docs */
381 int t=(i & 0x7F)>>2;
382 if(t<16) framerate = (AVRational){1, t+1};
383 else framerate = (AVRational){t-15, 1};
384
385 if(i&1){
386 framerate.num *= 1000;
387 framerate.den *= 1001;
388 }
389
390 if((i&3)==3) framerate.num *= 24;
391 else if((i&3)==2) framerate.num *= 25;
392 else framerate.num *= 30;
393 }
394 else
395 framerate= (AVRational){i, 1};
396
397 nsv->avsync = avio_rl16(pb);
398 nsv->framerate = framerate;
399
400 av_log(s, AV_LOG_TRACE, "NSV NSVs vsize %dx%d\n", vwidth, vheight);
401
402 /* XXX change to ap != NULL ? */
403 if (s->nb_streams == 0) { /* streams not yet published, let's do that */
404 nsv->vtag = vtag;
405 nsv->atag = atag;
406 nsv->vwidth = vwidth;
407 nsv->vheight = vwidth;
408 if (vtag != T_NONE) {
409 int i;
410 st = avformat_new_stream(s, NULL);
411 if (!st)
412 goto fail;
413
414 st->id = NSV_ST_VIDEO;
415 nst = av_mallocz(sizeof(NSVStream));
416 if (!nst)
417 goto fail;
418 st->priv_data = nst;
419 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
420 st->codecpar->codec_tag = vtag;
421 st->codecpar->codec_id = ff_codec_get_id(nsv_codec_video_tags, vtag);
422 st->codecpar->width = vwidth;
423 st->codecpar->height = vheight;
424 st->codecpar->bits_per_coded_sample = 24; /* depth XXX */
425
426 avpriv_set_pts_info(st, 64, framerate.den, framerate.num);
427 st->start_time = 0;
428 st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den);
429
430 for(i=0;i<nsv->index_entries;i++) {
431 if(nsv->nsvs_timestamps) {
432 av_add_index_entry(st, nsv->nsvs_file_offset[i], nsv->nsvs_timestamps[i],
433 0, 0, AVINDEX_KEYFRAME);
434 } else {
435 int64_t ts = av_rescale(i*nsv->duration/nsv->index_entries, framerate.num, 1000*framerate.den);
436 av_add_index_entry(st, nsv->nsvs_file_offset[i], ts, 0, 0, AVINDEX_KEYFRAME);
437 }
438 }
439 }
440 if (atag != T_NONE) {
441 st = avformat_new_stream(s, NULL);
442 if (!st)
443 goto fail;
444
445 st->id = NSV_ST_AUDIO;
446 nst = av_mallocz(sizeof(NSVStream));
447 if (!nst)
448 goto fail;
449 st->priv_data = nst;
450 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
451 st->codecpar->codec_tag = atag;
452 st->codecpar->codec_id = ff_codec_get_id(nsv_codec_audio_tags, atag);
453
454 st->need_parsing = AVSTREAM_PARSE_FULL; /* for PCM we will read a chunk later and put correct info */
455
456 /* set timebase to common denominator of ms and framerate */
457 avpriv_set_pts_info(st, 64, 1, framerate.num*1000);
458 st->start_time = 0;
459 st->duration = (int64_t)nsv->duration * framerate.num;
460 }
461 } else {
462 if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) {
463 av_log(s, AV_LOG_TRACE, "NSV NSVs header values differ from the first one!!!\n");
464 //return -1;
465 }
466 }
467
468 nsv->state = NSV_HAS_READ_NSVS;
469 return 0;
470fail:
471 /* XXX */
472 nsv->state = NSV_UNSYNC;
473 return -1;
474}
475
476static int nsv_read_header(AVFormatContext *s)
477{
478 NSVContext *nsv = s->priv_data;
479 int i, err;
480
481 nsv->state = NSV_UNSYNC;
482 nsv->ahead[0].data = nsv->ahead[1].data = NULL;
483
484 for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
485 if (nsv_resync(s) < 0)
486 return -1;
487 if (nsv->state == NSV_FOUND_NSVF) {
488 err = nsv_parse_NSVf_header(s);
489 if (err < 0)
490 return err;
491 }
492 /* we need the first NSVs also... */
493 if (nsv->state == NSV_FOUND_NSVS) {
494 err = nsv_parse_NSVs_header(s);
495 if (err < 0)
496 return err;
497 break; /* we just want the first one */
498 }
499 }
500 if (s->nb_streams < 1) /* no luck so far */
501 return -1;
502 /* now read the first chunk, so we can attempt to decode more info */
503 err = nsv_read_chunk(s, 1);
504
505 av_log(s, AV_LOG_TRACE, "parsed header\n");
506 return err;
507}
508
509static int nsv_read_chunk(AVFormatContext *s, int fill_header)
510{
511 NSVContext *nsv = s->priv_data;
512 AVIOContext *pb = s->pb;
513 AVStream *st[2] = {NULL, NULL};
514 NSVStream *nst;
515 AVPacket *pkt;
516 int i, err = 0;
517 uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */
518 uint32_t vsize;
519 uint16_t asize;
520 uint16_t auxsize;
521 int ret;
522
523 if (nsv->ahead[0].data || nsv->ahead[1].data)
524 return 0; //-1; /* hey! eat what you've in your plate first! */
525
526null_chunk_retry:
527 if (avio_feof(pb))
528 return -1;
529
530 for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++)
531 err = nsv_resync(s);
532 if (err < 0)
533 return err;
534 if (nsv->state == NSV_FOUND_NSVS)
535 err = nsv_parse_NSVs_header(s);
536 if (err < 0)
537 return err;
538 if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF)
539 return -1;
540
541 auxcount = avio_r8(pb);
542 vsize = avio_rl16(pb);
543 asize = avio_rl16(pb);
544 vsize = (vsize << 4) | (auxcount >> 4);
545 auxcount &= 0x0f;
546 av_log(s, AV_LOG_TRACE, "NSV CHUNK %d aux, %"PRIu32" bytes video, %d bytes audio\n", auxcount, vsize, asize);
547 /* skip aux stuff */
548 for (i = 0; i < auxcount; i++) {
549 uint32_t av_unused auxtag;
550 auxsize = avio_rl16(pb);
551 auxtag = avio_rl32(pb);
552 avio_skip(pb, auxsize);
553 vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming brain-dead */
554 }
555
556 if (avio_feof(pb))
557 return -1;
558 if (!vsize && !asize) {
559 nsv->state = NSV_UNSYNC;
560 goto null_chunk_retry;
561 }
562
563 /* map back streams to v,a */
564 if (s->nb_streams > 0)
565 st[s->streams[0]->id] = s->streams[0];
566 if (s->nb_streams > 1)
567 st[s->streams[1]->id] = s->streams[1];
568
569 if (vsize && st[NSV_ST_VIDEO]) {
570 nst = st[NSV_ST_VIDEO]->priv_data;
571 pkt = &nsv->ahead[NSV_ST_VIDEO];
572 if ((ret = av_get_packet(pb, pkt, vsize)) < 0)
573 return ret;
574 pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO;
575 pkt->dts = nst->frame_offset;
576 pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
577 for (i = 0; i < FFMIN(8, vsize); i++)
578 av_log(s, AV_LOG_TRACE, "NSV video: [%d] = %02x\n", i, pkt->data[i]);
579 }
580 if(st[NSV_ST_VIDEO])
581 ((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset++;
582
583 if (asize && st[NSV_ST_AUDIO]) {
584 nst = st[NSV_ST_AUDIO]->priv_data;
585 pkt = &nsv->ahead[NSV_ST_AUDIO];
586 /* read raw audio specific header on the first audio chunk... */
587 /* on ALL audio chunks ?? seems so! */
588 if (asize && st[NSV_ST_AUDIO]->codecpar->codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) {
589 uint8_t bps;
590 uint8_t channels;
591 uint16_t samplerate;
592 bps = avio_r8(pb);
593 channels = avio_r8(pb);
594 samplerate = avio_rl16(pb);
595 if (!channels || !samplerate)
596 return AVERROR_INVALIDDATA;
597 asize-=4;
598 av_log(s, AV_LOG_TRACE, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate);
599 if (fill_header) {
600 st[NSV_ST_AUDIO]->need_parsing = AVSTREAM_PARSE_NONE; /* we know everything */
601 if (bps != 16) {
602 av_log(s, AV_LOG_TRACE, "NSV AUDIO bit/sample != 16 (%d)!!!\n", bps);
603 }
604 bps /= channels; // ???
605 if (bps == 8)
606 st[NSV_ST_AUDIO]->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
607 samplerate /= 4;/* UGH ??? XXX */
608 channels = 1;
609 st[NSV_ST_AUDIO]->codecpar->channels = channels;
610 st[NSV_ST_AUDIO]->codecpar->sample_rate = samplerate;
611 av_log(s, AV_LOG_TRACE, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate);
612 }
613 }
614 if ((ret = av_get_packet(pb, pkt, asize)) < 0)
615 return ret;
616 pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO;
617 pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
618 if( nsv->state == NSV_HAS_READ_NSVS && st[NSV_ST_VIDEO] ) {
619 /* on a nsvs frame we have new information on a/v sync */
620 pkt->dts = (((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset-1);
621 pkt->dts *= (int64_t)1000 * nsv->framerate.den;
622 pkt->dts += (int64_t)nsv->avsync * nsv->framerate.num;
623 av_log(s, AV_LOG_TRACE, "NSV AUDIO: sync:%d, dts:%"PRId64, nsv->avsync, pkt->dts);
624 }
625 nst->frame_offset++;
626 }
627
628 nsv->state = NSV_UNSYNC;
629 return 0;
630}
631
632
633static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
634{
635 NSVContext *nsv = s->priv_data;
636 int i, err = 0;
637
638 /* in case we don't already have something to eat ... */
639 if (!nsv->ahead[0].data && !nsv->ahead[1].data)
640 err = nsv_read_chunk(s, 0);
641 if (err < 0)
642 return err;
643
644 /* now pick one of the plates */
645 for (i = 0; i < 2; i++) {
646 if (nsv->ahead[i].data) {
647 /* avoid the cost of new_packet + memcpy(->data) */
648 memcpy(pkt, &nsv->ahead[i], sizeof(AVPacket));
649 nsv->ahead[i].data = NULL; /* we ate that one */
650 return pkt->size;
651 }
652 }
653
654 /* this restaurant is not provisioned :^] */
655 return -1;
656}
657
658static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
659{
660 NSVContext *nsv = s->priv_data;
661 AVStream *st = s->streams[stream_index];
662 NSVStream *nst = st->priv_data;
663 int index;
664
665 index = av_index_search_timestamp(st, timestamp, flags);
666 if(index < 0)
667 return -1;
668
669 if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0)
670 return -1;
671
672 nst->frame_offset = st->index_entries[index].timestamp;
673 nsv->state = NSV_UNSYNC;
674 return 0;
675}
676
677static int nsv_read_close(AVFormatContext *s)
678{
679 NSVContext *nsv = s->priv_data;
680
681 av_freep(&nsv->nsvs_file_offset);
682 av_freep(&nsv->nsvs_timestamps);
683 if (nsv->ahead[0].data)
684 av_packet_unref(&nsv->ahead[0]);
685 if (nsv->ahead[1].data)
686 av_packet_unref(&nsv->ahead[1]);
687 return 0;
688}
689
690static int nsv_probe(AVProbeData *p)
691{
692 int i, score = 0;
693
694 /* check file header */
695 /* streamed files might not have any header */
696 if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
697 p->buf[2] == 'V' && (p->buf[3] == 'f' || p->buf[3] == 's'))
698 return AVPROBE_SCORE_MAX;
699 /* XXX: do streamed files always start at chunk boundary ?? */
700 /* or do we need to search NSVs in the byte stream ? */
701 /* seems the servers don't bother starting clean chunks... */
702 /* sometimes even the first header is at 9KB or something :^) */
703 for (i = 1; i < p->buf_size - 3; i++) {
704 if (AV_RL32(p->buf + i) == AV_RL32("NSVs")) {
705 /* Get the chunk size and check if at the end we are getting 0xBEEF */
706 int vsize = AV_RL24(p->buf+i+19) >> 4;
707 int asize = AV_RL16(p->buf+i+22);
708 int offset = i + 23 + asize + vsize + 1;
709 if (offset <= p->buf_size - 2 && AV_RL16(p->buf + offset) == 0xBEEF)
710 return 4*AVPROBE_SCORE_MAX/5;
711 score = AVPROBE_SCORE_MAX/5;
712 }
713 }
714 /* so we'll have more luck on extension... */
715 if (av_match_ext(p->filename, "nsv"))
716 return AVPROBE_SCORE_EXTENSION;
717 /* FIXME: add mime-type check */
718 return score;
719}
720
721AVInputFormat ff_nsv_demuxer = {
722 .name = "nsv",
723 .long_name = NULL_IF_CONFIG_SMALL("Nullsoft Streaming Video"),
724 .priv_data_size = sizeof(NSVContext),
725 .read_probe = nsv_probe,
726 .read_header = nsv_read_header,
727 .read_packet = nsv_read_packet,
728 .read_close = nsv_read_close,
729 .read_seek = nsv_read_seek,
730};
731
generated by cgit at 2024-05-17 04:13:00 (GMT)