66a5647af413a50e2b64a721e78669822905bfb2
[libav.git] / libavformat / nsvdec.c
1 /*
2 * NSV decoder.
3 * Copyright (c) 2004 The FFmpeg Project.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19 #include "avformat.h"
20 #include "avi.h"
21
22 #define DEBUG
23 //#define DEBUG_DUMP_INDEX // XXX dumbdriving-271.nsv breaks with it commented!!
24 //#define DEBUG_SEEK
25 #define CHECK_SUBSEQUENT_NSVS
26 //#define DISABLE_AUDIO
27
28 /* max bytes to crawl for trying to resync
29 * stupid streaming servers don't start at chunk boundaries...
30 */
31 #define NSV_MAX_RESYNC (500*1024)
32 #define NSV_MAX_RESYNC_TRIES 300
33
34 /*
35 * First version by Francois Revol - revol@free.fr
36 * References:
37 * (1) http://www.multimedia.cx/nsv-format.txt
38 * seems someone came to the same conclusions as me, and updated it:
39 * (2) http://www.stud.ktu.lt/~vitslav/nsv/nsv-format.txt
40 * http://www.stud.ktu.lt/~vitslav/nsv/
41 * Sample files:
42 * (S1) http://www.nullsoft.com/nsv/samples/
43 * http://www.nullsoft.com/nsv/samples/faster.nsv
44 * http://streamripper.sourceforge.net/openbb/read.php?TID=492&page=4
45 */
46
47 /*
48 * notes on the header (Francois Revol):
49 *
50 * It is followed by strings, then a table, but nothing tells
51 * where the table begins according to (1). After checking faster.nsv,
52 * I believe NVSf[16-19] gives the size of the strings data
53 * (that is the offset of the data table after the header).
54 * After checking all samples from (S1) all confirms this.
55 *
56 * Then, about NSVf[12-15], faster.nsf has 179700. When veiwing it in VLC,
57 * I noticed there was about 1 NVSs chunk/s, so I ran
58 * strings faster.nsv | grep NSVs | wc -l
59 * which gave me 180. That leads me to think that NSVf[12-15] might be the
60 * file length in milliseconds.
61 * Let's try that:
62 * 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
63 * except for nstrailer (which doesn't have an NSVf header), it repports correct time.
64 *
65 * nsvtrailer.nsv (S1) does not have any NSVf header, only NSVs chunks,
66 * so the header seems to not be mandatory. (for streaming).
67 *
68 * index slice duration check (excepts nsvtrailer.nsv):
69 * 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
70 */
71
72 /*
73 * TODO:
74 * - handle timestamps !!!
75 * - use index
76 * - mime-type in probe()
77 * - seek
78 */
79
80 #ifdef DEBUG
81 #define PRINT(_v) printf _v
82 #else
83 #define PRINT(_v)
84 #endif
85
86 #if 0
87 struct NSVf_header {
88 uint32_t chunk_tag; /* 'NSVf' */
89 uint32_t chunk_size;
90 uint32_t file_size; /* max 4GB ??? noone learns anything it seems :^) */
91 uint32_t file_length; //unknown1; /* what about MSB of file_size ? */
92 uint32_t info_strings_size; /* size of the info strings */ //unknown2;
93 uint32_t table_entries;
94 uint32_t table_entries_used; /* the left ones should be -1 */
95 };
96
97 struct NSVs_header {
98 uint32_t chunk_tag; /* 'NSVs' */
99 uint32_t v4cc; /* or 'NONE' */
100 uint32_t a4cc; /* or 'NONE' */
101 uint16_t vwidth; /* assert(vwidth%16==0) */
102 uint16_t vheight; /* assert(vheight%16==0) */
103 uint8_t framerate; /* value = (framerate&0x80)?frtable[frameratex0x7f]:framerate */
104 uint16_t unknown;
105 };
106
107 struct nsv_avchunk_header {
108 uint8_t vchunk_size_lsb;
109 uint16_t vchunk_size_msb; /* value = (vchunk_size_msb << 4) | (vchunk_size_lsb >> 4) */
110 uint16_t achunk_size;
111 };
112
113 struct nsv_pcm_header {
114 uint8_t bits_per_sample;
115 uint8_t channel_count;
116 uint16_t sample_rate;
117 };
118 #endif
119
120 /* variation from avi.h */
121 /*typedef struct CodecTag {
122 int id;
123 unsigned int tag;
124 } CodecTag;*/
125
126 /* tags */
127
128 #define T_NSVF MKTAG('N', 'S', 'V', 'f') /* file header */
129 #define T_NSVS MKTAG('N', 'S', 'V', 's') /* chunk header */
130 #define T_TOC2 MKTAG('T', 'O', 'C', '2') /* extra index marker */
131 #define T_NONE MKTAG('N', 'O', 'N', 'E') /* null a/v 4CC */
132 #define T_SUBT MKTAG('S', 'U', 'B', 'T') /* subtitle aux data */
133 #define T_ASYN MKTAG('A', 'S', 'Y', 'N') /* async a/v aux marker */
134 #define T_KEYF MKTAG('K', 'E', 'Y', 'F') /* video keyframe aux marker (addition) */
135
136 #define TB_NSVF MKBETAG('N', 'S', 'V', 'f')
137 #define TB_NSVS MKBETAG('N', 'S', 'V', 's')
138
139 /* hardcoded stream indices */
140 #define NSV_ST_VIDEO 0
141 #define NSV_ST_AUDIO 1
142 #define NSV_ST_SUBT 2
143
144 enum NSVStatus {
145 NSV_UNSYNC,
146 NSV_FOUND_NSVF,
147 NSV_HAS_READ_NSVF,
148 NSV_FOUND_NSVS,
149 NSV_HAS_READ_NSVS,
150 NSV_FOUND_BEEF,
151 NSV_GOT_VIDEO,
152 NSV_GOT_AUDIO,
153 };
154
155 typedef struct NSVStream {
156 int frame_offset; /* current frame (video) or byte (audio) counter
157 (used to compute the pts) */
158 int scale;
159 int rate;
160 int sample_size; /* audio only data */
161 int start;
162
163 int new_frame_offset; /* temporary storage (used during seek) */
164 int cum_len; /* temporary storage (used during seek) */
165 } NSVStream;
166
167 typedef struct {
168 int base_offset;
169 int NSVf_end;
170 uint32_t *nsvf_index_data;
171 int index_entries;
172 enum NSVStatus state;
173 AVPacket ahead[2]; /* [v, a] if .data is !NULL there is something */
174 /* cached */
175 int64_t duration;
176 uint32_t vtag, atag;
177 uint16_t vwidth, vheight;
178 //DVDemuxContext* dv_demux;
179 } NSVContext;
180
181 static const CodecTag nsv_codec_video_tags[] = {
182 { CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') },
183 { CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
184 { CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
185 /*
186 { CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') },
187 { CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') },
188 { CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') },
189 { CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
190 { CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') },
191 { CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') },
192 { CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') },
193 { CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
194 */
195 { CODEC_ID_XVID, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */
196 { CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') },
197 { 0, 0 },
198 };
199
200 static const CodecTag nsv_codec_audio_tags[] = {
201 { CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') },
202 { CODEC_ID_AAC, MKTAG('A', 'A', 'C', ' ') },
203 { CODEC_ID_AAC, MKTAG('A', 'A', 'C', 'P') }, /* _CUTTED__MUXED_2 Heads - Out Of The City.nsv */
204 { CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') },
205 { 0, 0 },
206 };
207
208 static const uint64_t nsv_framerate_table[] = {
209 ((uint64_t)AV_TIME_BASE * 30),
210 ((uint64_t)AV_TIME_BASE * 30000 / 1001), /* 29.97 */
211 ((uint64_t)AV_TIME_BASE * 25),
212 ((uint64_t)AV_TIME_BASE * 24000 / 1001), /* 23.98 */
213 ((uint64_t)AV_TIME_BASE * 30), /* ?? */
214 ((uint64_t)AV_TIME_BASE * 15000 / 1001), /* 14.98 */
215 };
216
217 //static int nsv_load_index(AVFormatContext *s);
218 static int nsv_read_chunk(AVFormatContext *s, int fill_header);
219
220 #ifdef DEBUG
221 static void print_tag(const char *str, unsigned int tag, int size)
222 {
223 printf("%s: tag=%c%c%c%c\n",
224 str, tag & 0xff,
225 (tag >> 8) & 0xff,
226 (tag >> 16) & 0xff,
227 (tag >> 24) & 0xff);
228 }
229 #endif
230
231 /* try to find something we recognize, and set the state accordingly */
232 static int nsv_resync(AVFormatContext *s)
233 {
234 NSVContext *nsv = s->priv_data;
235 ByteIOContext *pb = &s->pb;
236 uint32_t v = 0;
237 int i;
238
239 PRINT(("%s(), offset = %Ld, state = %d\n", __FUNCTION__, url_ftell(pb), nsv->state));
240
241 //nsv->state = NSV_UNSYNC;
242
243 for (i = 0; i < NSV_MAX_RESYNC; i++) {
244 if (url_feof(pb)) {
245 PRINT(("NSV EOF\n"));
246 nsv->state = NSV_UNSYNC;
247 return -1;
248 }
249 v <<= 8;
250 v |= get_byte(pb);
251 /*
252 if (i < 8) {
253 PRINT(("NSV resync: [%d] = %02x\n", i, v & 0x0FF));
254 }
255 */
256
257 if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */
258 PRINT(("NSV resynced on BEEF after %d bytes\n", i+1));
259 nsv->state = NSV_FOUND_BEEF;
260 return 0;
261 }
262 /* we read as big endian, thus the MK*BE* */
263 if (v == TB_NSVF) { /* NSVf */
264 PRINT(("NSV resynced on NSVf after %d bytes\n", i+1));
265 nsv->state = NSV_FOUND_NSVF;
266 return 0;
267 }
268 if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */
269 PRINT(("NSV resynced on NSVs after %d bytes\n", i+1));
270 nsv->state = NSV_FOUND_NSVS;
271 return 0;
272 }
273
274 }
275 PRINT(("NSV sync lost\n"));
276 return -1;
277 }
278
279 static int nsv_parse_NSVf_header(AVFormatContext *s, AVFormatParameters *ap)
280 {
281 NSVContext *nsv = s->priv_data;
282 ByteIOContext *pb = &s->pb;
283 unsigned int file_size, size;
284 int64_t duration;
285 int strings_size;
286 int table_entries;
287 int table_entries_used;
288
289 PRINT(("%s()\n", __FUNCTION__));
290
291 nsv->state = NSV_UNSYNC; /* in case we fail */
292
293 size = get_le32(pb);
294 if (size < 28)
295 return -1;
296 nsv->NSVf_end = size;
297
298 //s->file_size = (uint32_t)get_le32(pb);
299 file_size = (uint32_t)get_le32(pb);
300 PRINT(("NSV NSVf chunk_size %ld\n", size));
301 PRINT(("NSV NSVf file_size %Ld\n", file_size));
302
303 duration = get_le32(pb); /* in ms */
304 nsv->duration = duration * AV_TIME_BASE / 1000; /* convert */
305 PRINT(("NSV NSVf duration %Ld ms\n", duration));
306 // XXX: store it in AVStreams
307
308 strings_size = get_le32(pb);
309 table_entries = get_le32(pb);
310 table_entries_used = get_le32(pb);
311 PRINT(("NSV NSVf info-strings size: %d, table entries: %d, bis %d\n",
312 strings_size, table_entries, table_entries_used));
313 if (url_feof(pb))
314 return -1;
315
316 PRINT(("NSV got header; filepos %Ld\n", url_ftell(pb)));
317
318 if (strings_size > 0) {
319 char *strings; /* last byte will be '\0' to play safe with str*() */
320 char *p, *endp;
321 char *token, *value;
322 char quote;
323
324 p = strings = av_mallocz(strings_size + 1);
325 endp = strings + strings_size;
326 get_buffer(pb, strings, strings_size);
327 while (p < endp) {
328 while (*p == ' ')
329 p++; /* strip out spaces */
330 if (p >= endp-2)
331 break;
332 token = p;
333 p = strchr(p, '=');
334 if (!p || p >= endp-2)
335 break;
336 *p++ = '\0';
337 quote = *p++;
338 value = p;
339 p = strchr(p, quote);
340 if (!p || p >= endp)
341 break;
342 *p++ = '\0';
343 PRINT(("NSV NSVf INFO: %s='%s'\n", token, value));
344 if (!strcmp(token, "ASPECT")) {
345 /* don't care */
346 } else if (!strcmp(token, "CREATOR") || !strcmp(token, "Author")) {
347 strncpy(s->author, value, 512-1);
348 } else if (!strcmp(token, "Copyright")) {
349 strncpy(s->copyright, value, 512-1);
350 } else if (!strcmp(token, "TITLE") || !strcmp(token, "Title")) {
351 strncpy(s->title, value, 512-1);
352 }
353 }
354 av_free(strings);
355 }
356 if (url_feof(pb))
357 return -1;
358
359 PRINT(("NSV got infos; filepos %Ld\n", url_ftell(pb)));
360
361 if (table_entries_used > 0) {
362 nsv->index_entries = table_entries_used;
363 if((unsigned)table_entries >= UINT_MAX / sizeof(uint32_t))
364 return -1;
365 nsv->nsvf_index_data = av_malloc(table_entries * sizeof(uint32_t));
366 get_buffer(pb, nsv->nsvf_index_data, table_entries * sizeof(uint32_t));
367 }
368
369 PRINT(("NSV got index; filepos %Ld\n", url_ftell(pb)));
370
371 #ifdef DEBUG_DUMP_INDEX
372 #define V(v) ((v<0x20 || v > 127)?'.':v)
373 /* dump index */
374 PRINT(("NSV %d INDEX ENTRIES:\n", table_entries));
375 PRINT(("NSV [dataoffset][fileoffset]\n", table_entries));
376 for (i = 0; i < table_entries; i++) {
377 unsigned char b[8];
378 url_fseek(pb, size + nsv->nsvf_index_data[i], SEEK_SET);
379 get_buffer(pb, b, 8);
380 PRINT(("NSV [0x%08lx][0x%08lx]: %02x %02x %02x %02x %02x %02x %02x %02x"
381 "%c%c%c%c%c%c%c%c\n",
382 nsv->nsvf_index_data[i], size + nsv->nsvf_index_data[i],
383 b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7],
384 V(b[0]), V(b[1]), V(b[2]), V(b[3]), V(b[4]), V(b[5]), V(b[6]), V(b[7]) ));
385 }
386 //url_fseek(pb, size, SEEK_SET); /* go back to end of header */
387 #undef V
388 #endif
389
390 url_fseek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */
391
392 if (url_feof(pb))
393 return -1;
394 nsv->state = NSV_HAS_READ_NSVF;
395 return 0;
396 }
397
398 static int nsv_parse_NSVs_header(AVFormatContext *s, AVFormatParameters *ap)
399 {
400 NSVContext *nsv = s->priv_data;
401 ByteIOContext *pb = &s->pb;
402 uint32_t vtag, atag;
403 uint16_t vwidth, vheight;
404 uint32_t framerate;
405 uint16_t unknown;
406 AVStream *st;
407 NSVStream *nst;
408 PRINT(("%s()\n", __FUNCTION__));
409
410 vtag = get_le32(pb);
411 atag = get_le32(pb);
412 vwidth = get_le16(pb);
413 vheight = get_le16(pb);
414 framerate = (uint8_t)get_byte(pb);
415 /* XXX how big must the table be ? */
416 /* seems there is more to that... */
417 PRINT(("NSV NSVs framerate code %2x\n", framerate));
418 framerate = (framerate & 0x80)?(nsv_framerate_table[framerate & 0x7F]):(framerate*AV_TIME_BASE);
419 unknown = get_le16(pb);
420 #ifdef DEBUG
421 print_tag("NSV NSVs vtag", vtag, 0);
422 print_tag("NSV NSVs atag", atag, 0);
423 PRINT(("NSV NSVs vsize %dx%d\n", vwidth, vheight));
424 PRINT(("NSV NSVs framerate %2x\n", framerate));
425 #endif
426
427 /* XXX change to ap != NULL ? */
428 if (s->nb_streams == 0) { /* streams not yet published, let's do that */
429 nsv->vtag = vtag;
430 nsv->atag = atag;
431 nsv->vwidth = vwidth;
432 nsv->vheight = vwidth;
433 if (vtag != T_NONE) {
434 st = av_new_stream(s, NSV_ST_VIDEO);
435 if (!st)
436 goto fail;
437
438 nst = av_mallocz(sizeof(NSVStream));
439 if (!nst)
440 goto fail;
441 st->priv_data = nst;
442 st->codec.codec_type = CODEC_TYPE_VIDEO;
443 st->codec.codec_tag = vtag;
444 st->codec.codec_id = codec_get_id(nsv_codec_video_tags, vtag);
445 st->codec.width = vwidth;
446 st->codec.height = vheight;
447 st->codec.bits_per_sample = 24; /* depth XXX */
448
449 st->codec.frame_rate = framerate;
450 st->codec.frame_rate_base = AV_TIME_BASE;
451 av_set_pts_info(st, 64, AV_TIME_BASE, framerate);
452 st->start_time = 0;
453 st->duration = nsv->duration;
454 }
455 if (atag != T_NONE) {
456 #ifndef DISABLE_AUDIO
457 st = av_new_stream(s, NSV_ST_AUDIO);
458 if (!st)
459 goto fail;
460
461 nst = av_mallocz(sizeof(NSVStream));
462 if (!nst)
463 goto fail;
464 st->priv_data = nst;
465 st->codec.codec_type = CODEC_TYPE_AUDIO;
466 st->codec.codec_tag = atag;
467 st->codec.codec_id = codec_get_id(nsv_codec_audio_tags, atag);
468 st->start_time = 0;
469 st->duration = nsv->duration;
470
471 st->need_parsing = 1; /* for PCM we will read a chunk later and put correct info */
472 /* XXX:FIXME */
473 //st->codec.channels = 2; //XXX:channels;
474 //st->codec.sample_rate = 1000;
475 //av_set_pts_info(st, 64, 1, st->codec.sample_rate);
476
477 #endif
478 }
479 #ifdef CHECK_SUBSEQUENT_NSVS
480 } else {
481 if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) {
482 PRINT(("NSV NSVs header values differ from the first one!!!\n"));
483 //return -1;
484 }
485 #endif /* CHECK_SUBSEQUENT_NSVS */
486 }
487
488 nsv->state = NSV_HAS_READ_NSVS;
489 return 0;
490 fail:
491 /* XXX */
492 nsv->state = NSV_UNSYNC;
493 return -1;
494 }
495
496 static int nsv_read_header(AVFormatContext *s, AVFormatParameters *ap)
497 {
498 NSVContext *nsv = s->priv_data;
499 int i, err;
500
501 PRINT(("%s()\n", __FUNCTION__));
502 PRINT(("filename '%s'\n", s->filename));
503
504 nsv->state = NSV_UNSYNC;
505 nsv->ahead[0].data = nsv->ahead[1].data = NULL;
506
507 for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
508 if (nsv_resync(s) < 0)
509 return -1;
510 if (nsv->state == NSV_FOUND_NSVF)
511 err = nsv_parse_NSVf_header(s, ap);
512 /* we need the first NSVs also... */
513 if (nsv->state == NSV_FOUND_NSVS) {
514 err = nsv_parse_NSVs_header(s, ap);
515 break; /* we just want the first one */
516 }
517 }
518 if (s->nb_streams < 1) /* no luck so far */
519 return -1;
520 /* now read the first chunk, so we can attempt to decode more info */
521 err = nsv_read_chunk(s, 1);
522
523 PRINT(("parsed header\n"));
524 return 0;
525 }
526
527 static int nsv_read_chunk(AVFormatContext *s, int fill_header)
528 {
529 NSVContext *nsv = s->priv_data;
530 ByteIOContext *pb = &s->pb;
531 AVStream *st[2] = {NULL, NULL};
532 NSVStream *nst;
533 AVPacket *pkt;
534 int i, err = 0;
535 uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */
536 uint32_t vsize;
537 uint16_t asize;
538 uint16_t auxsize;
539 uint32_t auxtag;
540
541 PRINT(("%s(%d)\n", __FUNCTION__, fill_header));
542
543 if (nsv->ahead[0].data || nsv->ahead[1].data)
544 return 0; //-1; /* hey! eat what you've in your plate first! */
545
546 null_chunk_retry:
547 if (url_feof(pb))
548 return -1;
549
550 for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++)
551 err = nsv_resync(s);
552 if (err < 0)
553 return err;
554 if (nsv->state == NSV_FOUND_NSVS)
555 err = nsv_parse_NSVs_header(s, NULL);
556 if (err < 0)
557 return err;
558 if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF)
559 return -1;
560
561 auxcount = get_byte(pb);
562 vsize = get_le16(pb);
563 asize = get_le16(pb);
564 vsize = (vsize << 4) | (auxcount >> 4);
565 auxcount &= 0x0f;
566 PRINT(("NSV CHUNK %d aux, %ld bytes video, %d bytes audio\n", auxcount, vsize, asize));
567 /* skip aux stuff */
568 for (i = 0; i < auxcount; i++) {
569 auxsize = get_le16(pb);
570 auxtag = get_le32(pb);
571 PRINT(("NSV aux data: '%c%c%c%c', %d bytes\n",
572 (auxtag & 0x0ff),
573 ((auxtag >> 8) & 0x0ff),
574 ((auxtag >> 16) & 0x0ff),
575 ((auxtag >> 24) & 0x0ff),
576 auxsize));
577 url_fskip(pb, auxsize);
578 vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming braindead */
579 }
580
581 if (url_feof(pb))
582 return -1;
583 if (!vsize && !asize) {
584 nsv->state = NSV_UNSYNC;
585 goto null_chunk_retry;
586 }
587
588 /* map back streams to v,a */
589 if (s->streams[0])
590 st[s->streams[0]->id] = s->streams[0];
591 if (s->streams[1])
592 st[s->streams[1]->id] = s->streams[1];
593
594 if (vsize/* && st[NSV_ST_VIDEO]*/) {
595 nst = st[NSV_ST_VIDEO]->priv_data;
596 pkt = &nsv->ahead[NSV_ST_VIDEO];
597 av_new_packet(pkt, vsize);
598 get_buffer(pb, pkt->data, vsize);
599 pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO;
600 pkt->dts = nst->frame_offset++;
601 pkt->flags |= PKT_FLAG_KEY; /* stupid format has no way to tell XXX: try the index */
602 /*
603 for (i = 0; i < MIN(8, vsize); i++)
604 PRINT(("NSV video: [%d] = %02x\n", i, pkt->data[i]));
605 */
606 }
607 if (asize/*st[NSV_ST_AUDIO]*/) {
608 nst = st[NSV_ST_AUDIO]->priv_data;
609 pkt = &nsv->ahead[NSV_ST_AUDIO];
610 /* read raw audio specific header on the first audio chunk... */
611 /* on ALL audio chunks ?? seems so! */
612 if (asize && st[NSV_ST_AUDIO]->codec.codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) {
613 uint8_t bps;
614 uint8_t channels;
615 uint16_t samplerate;
616 bps = get_byte(pb);
617 channels = get_byte(pb);
618 samplerate = get_le16(pb);
619 asize-=4;
620 PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %ld\n", bps, channels, samplerate));
621 if (fill_header) {
622 st[NSV_ST_AUDIO]->need_parsing = 0; /* we know everything */
623 if (bps != 16) {
624 PRINT(("NSV AUDIO bit/sample != 16 (%d)!!!\n", bps));
625 }
626 bps /= channels; // ???
627 if (bps == 8)
628 st[NSV_ST_AUDIO]->codec.codec_id = CODEC_ID_PCM_U8;
629 samplerate /= 4;/* UGH ??? XXX */
630 channels = 1;
631 st[NSV_ST_AUDIO]->codec.channels = channels;
632 st[NSV_ST_AUDIO]->codec.sample_rate = samplerate;
633 av_set_pts_info(st[NSV_ST_AUDIO], 64, 1,
634 st[NSV_ST_AUDIO]->codec.sample_rate);
635 PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %ld\n", bps, channels, samplerate));
636 }
637 }
638 av_new_packet(pkt, asize);
639 if (asize)
640 get_buffer(pb, pkt->data, asize);
641 pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO;
642 //pkt->dts = nst->frame_offset;
643 //if (nst->sample_size)
644 // pkt->dts /= nst->sample_size;
645 nst->frame_offset += asize; // XXX: that's valid only for PCM !?
646 }
647
648 //pkt->flags |= PKT_FLAG_KEY;
649 nsv->state = NSV_UNSYNC;
650 return 0;
651 }
652
653
654 static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
655 {
656 NSVContext *nsv = s->priv_data;
657 int i, err = 0;
658
659 PRINT(("%s()\n", __FUNCTION__));
660
661 /* in case we don't already have something to eat ... */
662 if (nsv->ahead[0].data == NULL && nsv->ahead[1].data == NULL)
663 err = nsv_read_chunk(s, 0);
664 if (err < 0)
665 return err;
666
667 /* now pick one of the plates */
668 for (i = 0; i < 2; i++) {
669 if (nsv->ahead[i].data) {
670 PRINT(("%s: using cached packet[%d]\n", __FUNCTION__, i));
671 /* avoid the cost of new_packet + memcpy(->data) */
672 memcpy(pkt, &nsv->ahead[i], sizeof(AVPacket));
673 nsv->ahead[i].data = NULL; /* we ate that one */
674 return pkt->size;
675 }
676 }
677
678 /* this restaurant is not approvisionned :^] */
679 return -1;
680 }
681
682 static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
683 {
684 #if 0
685 NSVContext *avi = s->priv_data;
686 AVStream *st;
687 NSVStream *ast;
688 int frame_number, i;
689 int64_t pos;
690 #endif
691
692 return -1;
693 }
694
695 static int nsv_read_close(AVFormatContext *s)
696 {
697 /* int i; */
698 NSVContext *nsv = s->priv_data;
699
700 if (nsv->index_entries)
701 av_free(nsv->nsvf_index_data);
702
703 #if 0
704
705 for(i=0;i<s->nb_streams;i++) {
706 AVStream *st = s->streams[i];
707 NSVStream *ast = st->priv_data;
708 if(ast){
709 av_free(ast->index_entries);
710 av_free(ast);
711 }
712 av_free(st->codec.extradata);
713 av_free(st->codec.palctrl);
714 }
715
716 #endif
717 return 0;
718 }
719
720 static int nsv_probe(AVProbeData *p)
721 {
722 int i;
723 // PRINT(("nsv_probe(), buf_size %d\n", p->buf_size));
724 /* check file header */
725 if (p->buf_size <= 32)
726 return 0;
727 if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
728 p->buf[2] == 'V' && p->buf[3] == 'f')
729 return AVPROBE_SCORE_MAX;
730 /* streamed files might not have any header */
731 if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
732 p->buf[2] == 'V' && p->buf[3] == 's')
733 return AVPROBE_SCORE_MAX;
734 /* XXX: do streamed files always start at chunk boundary ?? */
735 /* or do we need to search NSVs in the byte stream ? */
736 /* seems the servers don't bother starting clean chunks... */
737 /* sometimes even the first header is at 9KB or something :^) */
738 for (i = 1; i < p->buf_size - 3; i++) {
739 if (p->buf[i+0] == 'N' && p->buf[i+1] == 'S' &&
740 p->buf[i+2] == 'V' && p->buf[i+3] == 's')
741 return AVPROBE_SCORE_MAX-20;
742 }
743 /* so we'll have more luck on extension... */
744 if (match_ext(p->filename, "nsv"))
745 return AVPROBE_SCORE_MAX-20;
746 /* FIXME: add mime-type check */
747 return 0;
748 }
749
750 static AVInputFormat nsv_iformat = {
751 "nsv",
752 "NullSoft Video format",
753 sizeof(NSVContext),
754 nsv_probe,
755 nsv_read_header,
756 nsv_read_packet,
757 nsv_read_close,
758 nsv_read_seek,
759 };
760
761 int nsvdec_init(void)
762 {
763 av_register_input_format(&nsv_iformat);
764 return 0;
765 }