/libavformat/nsvdec.c

http://github.com/FFmpeg/FFmpeg · C · 746 lines · 551 code · 86 blank · 109 comment · 141 complexity · 455caae6bd442e4ea6782fffae61328b MD5 · raw file

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