Use more descriptive format long_names.
[libav.git] / libavformat / nsvdec.c
1 /*
2 * NSV demuxer
3 * Copyright (c) 2004 The FFmpeg Project
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 #include "avformat.h"
22 #include "riff.h"
23
24 //#define DEBUG
25 //#define DEBUG_DUMP_INDEX // XXX dumbdriving-271.nsv breaks with it commented!!
26 //#define DEBUG_SEEK
27 #define CHECK_SUBSEQUENT_NSVS
28 //#define DISABLE_AUDIO
29
30 /* max bytes to crawl for trying to resync
31 * stupid streaming servers don't start at chunk boundaries...
32 */
33 #define NSV_MAX_RESYNC (500*1024)
34 #define NSV_MAX_RESYNC_TRIES 300
35
36 /*
37 * First version by Francois Revol - revol@free.fr
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 veiwing 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 nstrailer (which doesn't have an NSVf header), it repports 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 #ifdef DEBUG
85 #define PRINT(_v) printf _v
86 #else
87 #define PRINT(_v)
88 #endif
89
90 #if 0
91 struct NSVf_header {
92 uint32_t chunk_tag; /* 'NSVf' */
93 uint32_t chunk_size;
94 uint32_t file_size; /* max 4GB ??? no one learns anything it seems :^) */
95 uint32_t file_length; //unknown1; /* what about MSB of file_size ? */
96 uint32_t info_strings_size; /* size of the info strings */ //unknown2;
97 uint32_t table_entries;
98 uint32_t table_entries_used; /* the left ones should be -1 */
99 };
100
101 struct NSVs_header {
102 uint32_t chunk_tag; /* 'NSVs' */
103 uint32_t v4cc; /* or 'NONE' */
104 uint32_t a4cc; /* or 'NONE' */
105 uint16_t vwidth; /* assert(vwidth%16==0) */
106 uint16_t vheight; /* assert(vheight%16==0) */
107 uint8_t framerate; /* value = (framerate&0x80)?frtable[frameratex0x7f]:framerate */
108 uint16_t unknown;
109 };
110
111 struct nsv_avchunk_header {
112 uint8_t vchunk_size_lsb;
113 uint16_t vchunk_size_msb; /* value = (vchunk_size_msb << 4) | (vchunk_size_lsb >> 4) */
114 uint16_t achunk_size;
115 };
116
117 struct nsv_pcm_header {
118 uint8_t bits_per_sample;
119 uint8_t channel_count;
120 uint16_t sample_rate;
121 };
122 #endif
123
124 /* variation from avi.h */
125 /*typedef struct CodecTag {
126 int id;
127 unsigned int tag;
128 } CodecTag;*/
129
130 /* tags */
131
132 #define T_NSVF MKTAG('N', 'S', 'V', 'f') /* file header */
133 #define T_NSVS MKTAG('N', 'S', 'V', 's') /* chunk header */
134 #define T_TOC2 MKTAG('T', 'O', 'C', '2') /* extra index marker */
135 #define T_NONE MKTAG('N', 'O', 'N', 'E') /* null a/v 4CC */
136 #define T_SUBT MKTAG('S', 'U', 'B', 'T') /* subtitle aux data */
137 #define T_ASYN MKTAG('A', 'S', 'Y', 'N') /* async a/v aux marker */
138 #define T_KEYF MKTAG('K', 'E', 'Y', 'F') /* video keyframe aux marker (addition) */
139
140 #define TB_NSVF MKBETAG('N', 'S', 'V', 'f')
141 #define TB_NSVS MKBETAG('N', 'S', 'V', 's')
142
143 /* hardcoded stream indexes */
144 #define NSV_ST_VIDEO 0
145 #define NSV_ST_AUDIO 1
146 #define NSV_ST_SUBT 2
147
148 enum NSVStatus {
149 NSV_UNSYNC,
150 NSV_FOUND_NSVF,
151 NSV_HAS_READ_NSVF,
152 NSV_FOUND_NSVS,
153 NSV_HAS_READ_NSVS,
154 NSV_FOUND_BEEF,
155 NSV_GOT_VIDEO,
156 NSV_GOT_AUDIO,
157 };
158
159 typedef struct NSVStream {
160 int frame_offset; /* current frame (video) or byte (audio) counter
161 (used to compute the pts) */
162 int scale;
163 int rate;
164 int sample_size; /* audio only data */
165 int start;
166
167 int new_frame_offset; /* temporary storage (used during seek) */
168 int cum_len; /* temporary storage (used during seek) */
169 } NSVStream;
170
171 typedef struct {
172 int base_offset;
173 int NSVf_end;
174 uint32_t *nsvf_index_data;
175 int index_entries;
176 enum NSVStatus state;
177 AVPacket ahead[2]; /* [v, a] if .data is !NULL there is something */
178 /* cached */
179 int64_t duration;
180 uint32_t vtag, atag;
181 uint16_t vwidth, vheight;
182 int16_t avsync;
183 AVRational framerate;
184 //DVDemuxContext* dv_demux;
185 } NSVContext;
186
187 static const AVCodecTag nsv_codec_video_tags[] = {
188 { CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') },
189 { CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
190 { CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
191 { CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') },
192 { CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
193 { CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') },
194 { CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') },
195 { CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') },
196 { CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
197 /*
198 { CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') },
199 { CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') },
200 */
201 { CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */
202 { CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') },
203 { 0, 0 },
204 };
205
206 static const AVCodecTag nsv_codec_audio_tags[] = {
207 { CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') },
208 { CODEC_ID_AAC, MKTAG('A', 'A', 'C', ' ') },
209 { CODEC_ID_AAC, MKTAG('A', 'A', 'C', 'P') }, /* _CUTTED__MUXED_2 Heads - Out Of The City.nsv */
210 { CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') },
211 { 0, 0 },
212 };
213
214 //static int nsv_load_index(AVFormatContext *s);
215 static int nsv_read_chunk(AVFormatContext *s, int fill_header);
216
217 #ifdef DEBUG
218 static void print_tag(const char *str, unsigned int tag, int size)
219 {
220 printf("%s: tag=%c%c%c%c\n",
221 str, tag & 0xff,
222 (tag >> 8) & 0xff,
223 (tag >> 16) & 0xff,
224 (tag >> 24) & 0xff);
225 }
226 #endif
227
228 /* try to find something we recognize, and set the state accordingly */
229 static int nsv_resync(AVFormatContext *s)
230 {
231 NSVContext *nsv = s->priv_data;
232 ByteIOContext *pb = s->pb;
233 uint32_t v = 0;
234 int i;
235
236 PRINT(("%s(), offset = %"PRId64", state = %d\n", __FUNCTION__, url_ftell(pb), nsv->state));
237
238 //nsv->state = NSV_UNSYNC;
239
240 for (i = 0; i < NSV_MAX_RESYNC; i++) {
241 if (url_feof(pb)) {
242 PRINT(("NSV EOF\n"));
243 nsv->state = NSV_UNSYNC;
244 return -1;
245 }
246 v <<= 8;
247 v |= get_byte(pb);
248 /*
249 if (i < 8) {
250 PRINT(("NSV resync: [%d] = %02x\n", i, v & 0x0FF));
251 }
252 */
253
254 if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */
255 PRINT(("NSV resynced on BEEF after %d bytes\n", i+1));
256 nsv->state = NSV_FOUND_BEEF;
257 return 0;
258 }
259 /* we read as big endian, thus the MK*BE* */
260 if (v == TB_NSVF) { /* NSVf */
261 PRINT(("NSV resynced on NSVf after %d bytes\n", i+1));
262 nsv->state = NSV_FOUND_NSVF;
263 return 0;
264 }
265 if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */
266 PRINT(("NSV resynced on NSVs after %d bytes\n", i+1));
267 nsv->state = NSV_FOUND_NSVS;
268 return 0;
269 }
270
271 }
272 PRINT(("NSV sync lost\n"));
273 return -1;
274 }
275
276 static int nsv_parse_NSVf_header(AVFormatContext *s, AVFormatParameters *ap)
277 {
278 NSVContext *nsv = s->priv_data;
279 ByteIOContext *pb = s->pb;
280 unsigned int file_size, size;
281 int64_t duration;
282 int strings_size;
283 int table_entries;
284 int table_entries_used;
285
286 PRINT(("%s()\n", __FUNCTION__));
287
288 nsv->state = NSV_UNSYNC; /* in case we fail */
289
290 size = get_le32(pb);
291 if (size < 28)
292 return -1;
293 nsv->NSVf_end = size;
294
295 //s->file_size = (uint32_t)get_le32(pb);
296 file_size = (uint32_t)get_le32(pb);
297 PRINT(("NSV NSVf chunk_size %u\n", size));
298 PRINT(("NSV NSVf file_size %u\n", file_size));
299
300 nsv->duration = duration = get_le32(pb); /* in ms */
301 PRINT(("NSV NSVf duration %"PRId64" ms\n", duration));
302 // XXX: store it in AVStreams
303
304 strings_size = get_le32(pb);
305 table_entries = get_le32(pb);
306 table_entries_used = get_le32(pb);
307 PRINT(("NSV NSVf info-strings size: %d, table entries: %d, bis %d\n",
308 strings_size, table_entries, table_entries_used));
309 if (url_feof(pb))
310 return -1;
311
312 PRINT(("NSV got header; filepos %"PRId64"\n", url_ftell(pb)));
313
314 if (strings_size > 0) {
315 char *strings; /* last byte will be '\0' to play safe with str*() */
316 char *p, *endp;
317 char *token, *value;
318 char quote;
319
320 p = strings = av_mallocz(strings_size + 1);
321 endp = strings + strings_size;
322 get_buffer(pb, strings, strings_size);
323 while (p < endp) {
324 while (*p == ' ')
325 p++; /* strip out spaces */
326 if (p >= endp-2)
327 break;
328 token = p;
329 p = strchr(p, '=');
330 if (!p || p >= endp-2)
331 break;
332 *p++ = '\0';
333 quote = *p++;
334 value = p;
335 p = strchr(p, quote);
336 if (!p || p >= endp)
337 break;
338 *p++ = '\0';
339 PRINT(("NSV NSVf INFO: %s='%s'\n", token, value));
340 if (!strcmp(token, "ASPECT")) {
341 /* don't care */
342 } else if (!strcmp(token, "CREATOR") || !strcmp(token, "Author")) {
343 strncpy(s->author, value, 512-1);
344 } else if (!strcmp(token, "Copyright")) {
345 strncpy(s->copyright, value, 512-1);
346 } else if (!strcmp(token, "TITLE") || !strcmp(token, "Title")) {
347 strncpy(s->title, value, 512-1);
348 }
349 }
350 av_free(strings);
351 }
352 if (url_feof(pb))
353 return -1;
354
355 PRINT(("NSV got infos; filepos %"PRId64"\n", url_ftell(pb)));
356
357 if (table_entries_used > 0) {
358 nsv->index_entries = table_entries_used;
359 if((unsigned)table_entries >= UINT_MAX / sizeof(uint32_t))
360 return -1;
361 nsv->nsvf_index_data = av_malloc(table_entries * sizeof(uint32_t));
362 #warning "FIXME: Byteswap buffer as needed"
363 get_buffer(pb, (unsigned char *)nsv->nsvf_index_data, table_entries * sizeof(uint32_t));
364 }
365
366 PRINT(("NSV got index; filepos %"PRId64"\n", url_ftell(pb)));
367
368 #ifdef DEBUG_DUMP_INDEX
369 #define V(v) ((v<0x20 || v > 127)?'.':v)
370 /* dump index */
371 PRINT(("NSV %d INDEX ENTRIES:\n", table_entries));
372 PRINT(("NSV [dataoffset][fileoffset]\n", table_entries));
373 for (i = 0; i < table_entries; i++) {
374 unsigned char b[8];
375 url_fseek(pb, size + nsv->nsvf_index_data[i], SEEK_SET);
376 get_buffer(pb, b, 8);
377 PRINT(("NSV [0x%08lx][0x%08lx]: %02x %02x %02x %02x %02x %02x %02x %02x"
378 "%c%c%c%c%c%c%c%c\n",
379 nsv->nsvf_index_data[i], size + nsv->nsvf_index_data[i],
380 b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7],
381 V(b[0]), V(b[1]), V(b[2]), V(b[3]), V(b[4]), V(b[5]), V(b[6]), V(b[7]) ));
382 }
383 //url_fseek(pb, size, SEEK_SET); /* go back to end of header */
384 #undef V
385 #endif
386
387 url_fseek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */
388
389 if (url_feof(pb))
390 return -1;
391 nsv->state = NSV_HAS_READ_NSVF;
392 return 0;
393 }
394
395 static int nsv_parse_NSVs_header(AVFormatContext *s, AVFormatParameters *ap)
396 {
397 NSVContext *nsv = s->priv_data;
398 ByteIOContext *pb = s->pb;
399 uint32_t vtag, atag;
400 uint16_t vwidth, vheight;
401 AVRational framerate;
402 int i;
403 AVStream *st;
404 NSVStream *nst;
405 PRINT(("%s()\n", __FUNCTION__));
406
407 vtag = get_le32(pb);
408 atag = get_le32(pb);
409 vwidth = get_le16(pb);
410 vheight = get_le16(pb);
411 i = get_byte(pb);
412
413 PRINT(("NSV NSVs framerate code %2x\n", i));
414 if(i&0x80) { /* odd way of giving native framerates from docs */
415 int t=(i & 0x7F)>>2;
416 if(t<16) framerate = (AVRational){1, t+1};
417 else framerate = (AVRational){t-15, 1};
418
419 if(i&1){
420 framerate.num *= 1000;
421 framerate.den *= 1001;
422 }
423
424 if((i&3)==3) framerate.num *= 24;
425 else if((i&3)==2) framerate.num *= 25;
426 else framerate.num *= 30;
427 }
428 else
429 framerate= (AVRational){i, 1};
430
431 nsv->avsync = get_le16(pb);
432 nsv->framerate = framerate;
433 #ifdef DEBUG
434 print_tag("NSV NSVs vtag", vtag, 0);
435 print_tag("NSV NSVs atag", atag, 0);
436 PRINT(("NSV NSVs vsize %dx%d\n", vwidth, vheight));
437 #endif
438
439 /* XXX change to ap != NULL ? */
440 if (s->nb_streams == 0) { /* streams not yet published, let's do that */
441 nsv->vtag = vtag;
442 nsv->atag = atag;
443 nsv->vwidth = vwidth;
444 nsv->vheight = vwidth;
445 if (vtag != T_NONE) {
446 st = av_new_stream(s, NSV_ST_VIDEO);
447 if (!st)
448 goto fail;
449
450 nst = av_mallocz(sizeof(NSVStream));
451 if (!nst)
452 goto fail;
453 st->priv_data = nst;
454 st->codec->codec_type = CODEC_TYPE_VIDEO;
455 st->codec->codec_tag = vtag;
456 st->codec->codec_id = codec_get_id(nsv_codec_video_tags, vtag);
457 st->codec->width = vwidth;
458 st->codec->height = vheight;
459 st->codec->bits_per_coded_sample = 24; /* depth XXX */
460
461 av_set_pts_info(st, 64, framerate.den, framerate.num);
462 st->start_time = 0;
463 st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den);
464 }
465 if (atag != T_NONE) {
466 #ifndef DISABLE_AUDIO
467 st = av_new_stream(s, NSV_ST_AUDIO);
468 if (!st)
469 goto fail;
470
471 nst = av_mallocz(sizeof(NSVStream));
472 if (!nst)
473 goto fail;
474 st->priv_data = nst;
475 st->codec->codec_type = CODEC_TYPE_AUDIO;
476 st->codec->codec_tag = atag;
477 st->codec->codec_id = codec_get_id(nsv_codec_audio_tags, atag);
478
479 st->need_parsing = AVSTREAM_PARSE_FULL; /* for PCM we will read a chunk later and put correct info */
480
481 /* set timebase to common denominator of ms and framerate */
482 av_set_pts_info(st, 64, 1, framerate.num*1000);
483 st->start_time = 0;
484 st->duration = (int64_t)nsv->duration * framerate.num;
485 #endif
486 }
487 #ifdef CHECK_SUBSEQUENT_NSVS
488 } else {
489 if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) {
490 PRINT(("NSV NSVs header values differ from the first one!!!\n"));
491 //return -1;
492 }
493 #endif /* CHECK_SUBSEQUENT_NSVS */
494 }
495
496 nsv->state = NSV_HAS_READ_NSVS;
497 return 0;
498 fail:
499 /* XXX */
500 nsv->state = NSV_UNSYNC;
501 return -1;
502 }
503
504 static int nsv_read_header(AVFormatContext *s, AVFormatParameters *ap)
505 {
506 NSVContext *nsv = s->priv_data;
507 int i, err;
508
509 PRINT(("%s()\n", __FUNCTION__));
510 PRINT(("filename '%s'\n", s->filename));
511
512 nsv->state = NSV_UNSYNC;
513 nsv->ahead[0].data = nsv->ahead[1].data = NULL;
514
515 for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
516 if (nsv_resync(s) < 0)
517 return -1;
518 if (nsv->state == NSV_FOUND_NSVF)
519 err = nsv_parse_NSVf_header(s, ap);
520 /* we need the first NSVs also... */
521 if (nsv->state == NSV_FOUND_NSVS) {
522 err = nsv_parse_NSVs_header(s, ap);
523 break; /* we just want the first one */
524 }
525 }
526 if (s->nb_streams < 1) /* no luck so far */
527 return -1;
528 /* now read the first chunk, so we can attempt to decode more info */
529 err = nsv_read_chunk(s, 1);
530
531 PRINT(("parsed header\n"));
532 return 0;
533 }
534
535 static int nsv_read_chunk(AVFormatContext *s, int fill_header)
536 {
537 NSVContext *nsv = s->priv_data;
538 ByteIOContext *pb = s->pb;
539 AVStream *st[2] = {NULL, NULL};
540 NSVStream *nst;
541 AVPacket *pkt;
542 int i, err = 0;
543 uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */
544 uint32_t vsize;
545 uint16_t asize;
546 uint16_t auxsize;
547 uint32_t auxtag;
548
549 PRINT(("%s(%d)\n", __FUNCTION__, fill_header));
550
551 if (nsv->ahead[0].data || nsv->ahead[1].data)
552 return 0; //-1; /* hey! eat what you've in your plate first! */
553
554 null_chunk_retry:
555 if (url_feof(pb))
556 return -1;
557
558 for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++)
559 err = nsv_resync(s);
560 if (err < 0)
561 return err;
562 if (nsv->state == NSV_FOUND_NSVS)
563 err = nsv_parse_NSVs_header(s, NULL);
564 if (err < 0)
565 return err;
566 if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF)
567 return -1;
568
569 auxcount = get_byte(pb);
570 vsize = get_le16(pb);
571 asize = get_le16(pb);
572 vsize = (vsize << 4) | (auxcount >> 4);
573 auxcount &= 0x0f;
574 PRINT(("NSV CHUNK %d aux, %u bytes video, %d bytes audio\n", auxcount, vsize, asize));
575 /* skip aux stuff */
576 for (i = 0; i < auxcount; i++) {
577 auxsize = get_le16(pb);
578 auxtag = get_le32(pb);
579 PRINT(("NSV aux data: '%c%c%c%c', %d bytes\n",
580 (auxtag & 0x0ff),
581 ((auxtag >> 8) & 0x0ff),
582 ((auxtag >> 16) & 0x0ff),
583 ((auxtag >> 24) & 0x0ff),
584 auxsize));
585 url_fskip(pb, auxsize);
586 vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming braindead */
587 }
588
589 if (url_feof(pb))
590 return -1;
591 if (!vsize && !asize) {
592 nsv->state = NSV_UNSYNC;
593 goto null_chunk_retry;
594 }
595
596 /* map back streams to v,a */
597 if (s->streams[0])
598 st[s->streams[0]->id] = s->streams[0];
599 if (s->streams[1])
600 st[s->streams[1]->id] = s->streams[1];
601
602 if (vsize/* && st[NSV_ST_VIDEO]*/) {
603 nst = st[NSV_ST_VIDEO]->priv_data;
604 pkt = &nsv->ahead[NSV_ST_VIDEO];
605 av_get_packet(pb, pkt, vsize);
606 pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO;
607 pkt->dts = nst->frame_offset;
608 pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
609 /*
610 for (i = 0; i < MIN(8, vsize); i++)
611 PRINT(("NSV video: [%d] = %02x\n", i, pkt->data[i]));
612 */
613 }
614 if(st[NSV_ST_VIDEO])
615 ((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset++;
616
617 if (asize/*st[NSV_ST_AUDIO]*/) {
618 nst = st[NSV_ST_AUDIO]->priv_data;
619 pkt = &nsv->ahead[NSV_ST_AUDIO];
620 /* read raw audio specific header on the first audio chunk... */
621 /* on ALL audio chunks ?? seems so! */
622 if (asize && st[NSV_ST_AUDIO]->codec->codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) {
623 uint8_t bps;
624 uint8_t channels;
625 uint16_t samplerate;
626 bps = get_byte(pb);
627 channels = get_byte(pb);
628 samplerate = get_le16(pb);
629 asize-=4;
630 PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate));
631 if (fill_header) {
632 st[NSV_ST_AUDIO]->need_parsing = AVSTREAM_PARSE_NONE; /* we know everything */
633 if (bps != 16) {
634 PRINT(("NSV AUDIO bit/sample != 16 (%d)!!!\n", bps));
635 }
636 bps /= channels; // ???
637 if (bps == 8)
638 st[NSV_ST_AUDIO]->codec->codec_id = CODEC_ID_PCM_U8;
639 samplerate /= 4;/* UGH ??? XXX */
640 channels = 1;
641 st[NSV_ST_AUDIO]->codec->channels = channels;
642 st[NSV_ST_AUDIO]->codec->sample_rate = samplerate;
643 PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate));
644 }
645 }
646 av_get_packet(pb, pkt, asize);
647 pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO;
648 pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
649 if( nsv->state == NSV_HAS_READ_NSVS && st[NSV_ST_VIDEO] ) {
650 /* on a nsvs frame we have new information on a/v sync */
651 pkt->dts = (((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset-1);
652 pkt->dts *= (int64_t)1000 * nsv->framerate.den;
653 pkt->dts += (int64_t)nsv->avsync * nsv->framerate.num;
654 PRINT(("NSV AUDIO: sync:%d, dts:%"PRId64, nsv->avsync, pkt->dts));
655 }
656 nst->frame_offset++;
657 }
658
659 nsv->state = NSV_UNSYNC;
660 return 0;
661 }
662
663
664 static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
665 {
666 NSVContext *nsv = s->priv_data;
667 int i, err = 0;
668
669 PRINT(("%s()\n", __FUNCTION__));
670
671 /* in case we don't already have something to eat ... */
672 if (nsv->ahead[0].data == NULL && nsv->ahead[1].data == NULL)
673 err = nsv_read_chunk(s, 0);
674 if (err < 0)
675 return err;
676
677 /* now pick one of the plates */
678 for (i = 0; i < 2; i++) {
679 if (nsv->ahead[i].data) {
680 PRINT(("%s: using cached packet[%d]\n", __FUNCTION__, i));
681 /* avoid the cost of new_packet + memcpy(->data) */
682 memcpy(pkt, &nsv->ahead[i], sizeof(AVPacket));
683 nsv->ahead[i].data = NULL; /* we ate that one */
684 return pkt->size;
685 }
686 }
687
688 /* this restaurant is not approvisionned :^] */
689 return -1;
690 }
691
692 static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
693 {
694 #if 0
695 NSVContext *avi = s->priv_data;
696 AVStream *st;
697 NSVStream *ast;
698 int frame_number, i;
699 int64_t pos;
700 #endif
701
702 return -1;
703 }
704
705 static int nsv_read_close(AVFormatContext *s)
706 {
707 /* int i; */
708 NSVContext *nsv = s->priv_data;
709
710 if (nsv->index_entries)
711 av_free(nsv->nsvf_index_data);
712
713 #if 0
714
715 for(i=0;i<s->nb_streams;i++) {
716 AVStream *st = s->streams[i];
717 NSVStream *ast = st->priv_data;
718 if(ast){
719 av_free(ast->index_entries);
720 av_free(ast);
721 }
722 av_free(st->codec->palctrl);
723 }
724
725 #endif
726 return 0;
727 }
728
729 static int nsv_probe(AVProbeData *p)
730 {
731 int i;
732 // PRINT(("nsv_probe(), buf_size %d\n", p->buf_size));
733 /* check file header */
734 /* streamed files might not have any header */
735 if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
736 p->buf[2] == 'V' && (p->buf[3] == 'f' || p->buf[3] == 's'))
737 return AVPROBE_SCORE_MAX;
738 /* XXX: do streamed files always start at chunk boundary ?? */
739 /* or do we need to search NSVs in the byte stream ? */
740 /* seems the servers don't bother starting clean chunks... */
741 /* sometimes even the first header is at 9KB or something :^) */
742 for (i = 1; i < p->buf_size - 3; i++) {
743 if (p->buf[i+0] == 'N' && p->buf[i+1] == 'S' &&
744 p->buf[i+2] == 'V' && p->buf[i+3] == 's')
745 return AVPROBE_SCORE_MAX-20;
746 }
747 /* so we'll have more luck on extension... */
748 if (match_ext(p->filename, "nsv"))
749 return AVPROBE_SCORE_MAX/2;
750 /* FIXME: add mime-type check */
751 return 0;
752 }
753
754 AVInputFormat nsv_demuxer = {
755 "nsv",
756 NULL_IF_CONFIG_SMALL("Nullsoft Streaming Video"),
757 sizeof(NSVContext),
758 nsv_probe,
759 nsv_read_header,
760 nsv_read_packet,
761 nsv_read_close,
762 nsv_read_seek,
763 };