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2ba45a60 DM |
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 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 | #if 0 | |
85 | struct 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 | ||
95 | struct 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 | ||
105 | struct 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 | ||
111 | struct 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 | ||
142 | enum 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 | ||
153 | typedef 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 | ||
165 | typedef struct { | |
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 | //DVDemuxContext* dv_demux; | |
180 | } NSVContext; | |
181 | ||
182 | static const AVCodecTag nsv_codec_video_tags[] = { | |
183 | { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') }, | |
184 | { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') }, | |
185 | { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') }, | |
186 | { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') }, | |
187 | { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') }, | |
188 | { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') }, | |
189 | { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') }, | |
190 | { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') }, | |
191 | { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') }, | |
192 | { AV_CODEC_ID_VP8, MKTAG('V', 'P', '8', '0') }, | |
193 | /* | |
194 | { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') }, | |
195 | { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') }, | |
196 | */ | |
197 | { AV_CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */ | |
198 | { AV_CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') }, | |
199 | { AV_CODEC_ID_NONE, 0 }, | |
200 | }; | |
201 | ||
202 | static const AVCodecTag nsv_codec_audio_tags[] = { | |
203 | { AV_CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') }, | |
204 | { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'C', ' ') }, | |
205 | { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'C', 'P') }, | |
206 | { AV_CODEC_ID_AAC, MKTAG('V', 'L', 'B', ' ') }, | |
207 | { AV_CODEC_ID_SPEEX, MKTAG('S', 'P', 'X', ' ') }, | |
208 | { AV_CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') }, | |
209 | { AV_CODEC_ID_NONE, 0 }, | |
210 | }; | |
211 | ||
212 | //static int nsv_load_index(AVFormatContext *s); | |
213 | static int nsv_read_chunk(AVFormatContext *s, int fill_header); | |
214 | ||
215 | #define print_tag(str, tag, size) \ | |
216 | av_dlog(NULL, "%s: tag=%c%c%c%c\n", \ | |
217 | str, tag & 0xff, \ | |
218 | (tag >> 8) & 0xff, \ | |
219 | (tag >> 16) & 0xff, \ | |
220 | (tag >> 24) & 0xff); | |
221 | ||
222 | /* try to find something we recognize, and set the state accordingly */ | |
223 | static int nsv_resync(AVFormatContext *s) | |
224 | { | |
225 | NSVContext *nsv = s->priv_data; | |
226 | AVIOContext *pb = s->pb; | |
227 | uint32_t v = 0; | |
228 | int i; | |
229 | ||
230 | av_dlog(s, "%s(), offset = %"PRId64", state = %d\n", __FUNCTION__, avio_tell(pb), nsv->state); | |
231 | ||
232 | //nsv->state = NSV_UNSYNC; | |
233 | ||
234 | for (i = 0; i < NSV_MAX_RESYNC; i++) { | |
235 | if (avio_feof(pb)) { | |
236 | av_dlog(s, "NSV EOF\n"); | |
237 | nsv->state = NSV_UNSYNC; | |
238 | return -1; | |
239 | } | |
240 | v <<= 8; | |
241 | v |= avio_r8(pb); | |
242 | if (i < 8) { | |
243 | av_dlog(s, "NSV resync: [%d] = %02x\n", i, v & 0x0FF); | |
244 | } | |
245 | ||
246 | if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */ | |
247 | av_dlog(s, "NSV resynced on BEEF after %d bytes\n", i+1); | |
248 | nsv->state = NSV_FOUND_BEEF; | |
249 | return 0; | |
250 | } | |
251 | /* we read as big-endian, thus the MK*BE* */ | |
252 | if (v == TB_NSVF) { /* NSVf */ | |
253 | av_dlog(s, "NSV resynced on NSVf after %d bytes\n", i+1); | |
254 | nsv->state = NSV_FOUND_NSVF; | |
255 | return 0; | |
256 | } | |
257 | if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */ | |
258 | av_dlog(s, "NSV resynced on NSVs after %d bytes\n", i+1); | |
259 | nsv->state = NSV_FOUND_NSVS; | |
260 | return 0; | |
261 | } | |
262 | ||
263 | } | |
264 | av_dlog(s, "NSV sync lost\n"); | |
265 | return -1; | |
266 | } | |
267 | ||
268 | static int nsv_parse_NSVf_header(AVFormatContext *s) | |
269 | { | |
270 | NSVContext *nsv = s->priv_data; | |
271 | AVIOContext *pb = s->pb; | |
272 | unsigned int av_unused file_size; | |
273 | unsigned int size; | |
274 | int64_t duration; | |
275 | int strings_size; | |
276 | int table_entries; | |
277 | int table_entries_used; | |
278 | ||
279 | av_dlog(s, "%s()\n", __FUNCTION__); | |
280 | ||
281 | nsv->state = NSV_UNSYNC; /* in case we fail */ | |
282 | ||
283 | size = avio_rl32(pb); | |
284 | if (size < 28) | |
285 | return -1; | |
286 | nsv->NSVf_end = size; | |
287 | ||
288 | //s->file_size = (uint32_t)avio_rl32(pb); | |
289 | file_size = (uint32_t)avio_rl32(pb); | |
290 | av_dlog(s, "NSV NSVf chunk_size %u\n", size); | |
291 | av_dlog(s, "NSV NSVf file_size %u\n", file_size); | |
292 | ||
293 | nsv->duration = duration = avio_rl32(pb); /* in ms */ | |
294 | av_dlog(s, "NSV NSVf duration %"PRId64" ms\n", duration); | |
295 | // XXX: store it in AVStreams | |
296 | ||
297 | strings_size = avio_rl32(pb); | |
298 | table_entries = avio_rl32(pb); | |
299 | table_entries_used = avio_rl32(pb); | |
300 | av_dlog(s, "NSV NSVf info-strings size: %d, table entries: %d, bis %d\n", | |
301 | strings_size, table_entries, table_entries_used); | |
302 | if (avio_feof(pb)) | |
303 | return -1; | |
304 | ||
305 | av_dlog(s, "NSV got header; filepos %"PRId64"\n", avio_tell(pb)); | |
306 | ||
307 | if (strings_size > 0) { | |
308 | char *strings; /* last byte will be '\0' to play safe with str*() */ | |
309 | char *p, *endp; | |
310 | char *token, *value; | |
311 | char quote; | |
312 | ||
313 | p = strings = av_mallocz((size_t)strings_size + 1); | |
314 | if (!p) | |
315 | return AVERROR(ENOMEM); | |
316 | endp = strings + strings_size; | |
317 | avio_read(pb, strings, strings_size); | |
318 | while (p < endp) { | |
319 | while (*p == ' ') | |
320 | p++; /* strip out spaces */ | |
321 | if (p >= endp-2) | |
322 | break; | |
323 | token = p; | |
324 | p = strchr(p, '='); | |
325 | if (!p || p >= endp-2) | |
326 | break; | |
327 | *p++ = '\0'; | |
328 | quote = *p++; | |
329 | value = p; | |
330 | p = strchr(p, quote); | |
331 | if (!p || p >= endp) | |
332 | break; | |
333 | *p++ = '\0'; | |
334 | av_dlog(s, "NSV NSVf INFO: %s='%s'\n", token, value); | |
335 | av_dict_set(&s->metadata, token, value, 0); | |
336 | } | |
337 | av_free(strings); | |
338 | } | |
339 | if (avio_feof(pb)) | |
340 | return -1; | |
341 | ||
342 | av_dlog(s, "NSV got infos; filepos %"PRId64"\n", avio_tell(pb)); | |
343 | ||
344 | if (table_entries_used > 0) { | |
345 | int i; | |
346 | nsv->index_entries = table_entries_used; | |
347 | if((unsigned)table_entries_used >= UINT_MAX / sizeof(uint32_t)) | |
348 | return -1; | |
349 | nsv->nsvs_file_offset = av_malloc((unsigned)table_entries_used * sizeof(uint32_t)); | |
350 | if (!nsv->nsvs_file_offset) | |
351 | return AVERROR(ENOMEM); | |
352 | ||
353 | for(i=0;i<table_entries_used;i++) | |
354 | nsv->nsvs_file_offset[i] = avio_rl32(pb) + size; | |
355 | ||
356 | if(table_entries > table_entries_used && | |
357 | avio_rl32(pb) == MKTAG('T','O','C','2')) { | |
358 | nsv->nsvs_timestamps = av_malloc((unsigned)table_entries_used*sizeof(uint32_t)); | |
359 | if (!nsv->nsvs_timestamps) | |
360 | return AVERROR(ENOMEM); | |
361 | for(i=0;i<table_entries_used;i++) { | |
362 | nsv->nsvs_timestamps[i] = avio_rl32(pb); | |
363 | } | |
364 | } | |
365 | } | |
366 | ||
367 | av_dlog(s, "NSV got index; filepos %"PRId64"\n", avio_tell(pb)); | |
368 | ||
369 | avio_seek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */ | |
370 | ||
371 | if (avio_feof(pb)) | |
372 | return -1; | |
373 | nsv->state = NSV_HAS_READ_NSVF; | |
374 | return 0; | |
375 | } | |
376 | ||
377 | static int nsv_parse_NSVs_header(AVFormatContext *s) | |
378 | { | |
379 | NSVContext *nsv = s->priv_data; | |
380 | AVIOContext *pb = s->pb; | |
381 | uint32_t vtag, atag; | |
382 | uint16_t vwidth, vheight; | |
383 | AVRational framerate; | |
384 | int i; | |
385 | AVStream *st; | |
386 | NSVStream *nst; | |
387 | av_dlog(s, "%s()\n", __FUNCTION__); | |
388 | ||
389 | vtag = avio_rl32(pb); | |
390 | atag = avio_rl32(pb); | |
391 | vwidth = avio_rl16(pb); | |
392 | vheight = avio_rl16(pb); | |
393 | i = avio_r8(pb); | |
394 | ||
395 | av_dlog(s, "NSV NSVs framerate code %2x\n", i); | |
396 | if(i&0x80) { /* odd way of giving native framerates from docs */ | |
397 | int t=(i & 0x7F)>>2; | |
398 | if(t<16) framerate = (AVRational){1, t+1}; | |
399 | else framerate = (AVRational){t-15, 1}; | |
400 | ||
401 | if(i&1){ | |
402 | framerate.num *= 1000; | |
403 | framerate.den *= 1001; | |
404 | } | |
405 | ||
406 | if((i&3)==3) framerate.num *= 24; | |
407 | else if((i&3)==2) framerate.num *= 25; | |
408 | else framerate.num *= 30; | |
409 | } | |
410 | else | |
411 | framerate= (AVRational){i, 1}; | |
412 | ||
413 | nsv->avsync = avio_rl16(pb); | |
414 | nsv->framerate = framerate; | |
415 | ||
416 | print_tag("NSV NSVs vtag", vtag, 0); | |
417 | print_tag("NSV NSVs atag", atag, 0); | |
418 | av_dlog(s, "NSV NSVs vsize %dx%d\n", vwidth, vheight); | |
419 | ||
420 | /* XXX change to ap != NULL ? */ | |
421 | if (s->nb_streams == 0) { /* streams not yet published, let's do that */ | |
422 | nsv->vtag = vtag; | |
423 | nsv->atag = atag; | |
424 | nsv->vwidth = vwidth; | |
425 | nsv->vheight = vwidth; | |
426 | if (vtag != T_NONE) { | |
427 | int i; | |
428 | st = avformat_new_stream(s, NULL); | |
429 | if (!st) | |
430 | goto fail; | |
431 | ||
432 | st->id = NSV_ST_VIDEO; | |
433 | nst = av_mallocz(sizeof(NSVStream)); | |
434 | if (!nst) | |
435 | goto fail; | |
436 | st->priv_data = nst; | |
437 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
438 | st->codec->codec_tag = vtag; | |
439 | st->codec->codec_id = ff_codec_get_id(nsv_codec_video_tags, vtag); | |
440 | st->codec->width = vwidth; | |
441 | st->codec->height = vheight; | |
442 | st->codec->bits_per_coded_sample = 24; /* depth XXX */ | |
443 | ||
444 | avpriv_set_pts_info(st, 64, framerate.den, framerate.num); | |
445 | st->start_time = 0; | |
446 | st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den); | |
447 | ||
448 | for(i=0;i<nsv->index_entries;i++) { | |
449 | if(nsv->nsvs_timestamps) { | |
450 | av_add_index_entry(st, nsv->nsvs_file_offset[i], nsv->nsvs_timestamps[i], | |
451 | 0, 0, AVINDEX_KEYFRAME); | |
452 | } else { | |
453 | int64_t ts = av_rescale(i*nsv->duration/nsv->index_entries, framerate.num, 1000*framerate.den); | |
454 | av_add_index_entry(st, nsv->nsvs_file_offset[i], ts, 0, 0, AVINDEX_KEYFRAME); | |
455 | } | |
456 | } | |
457 | } | |
458 | if (atag != T_NONE) { | |
459 | st = avformat_new_stream(s, NULL); | |
460 | if (!st) | |
461 | goto fail; | |
462 | ||
463 | st->id = NSV_ST_AUDIO; | |
464 | nst = av_mallocz(sizeof(NSVStream)); | |
465 | if (!nst) | |
466 | goto fail; | |
467 | st->priv_data = nst; | |
468 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
469 | st->codec->codec_tag = atag; | |
470 | st->codec->codec_id = ff_codec_get_id(nsv_codec_audio_tags, atag); | |
471 | ||
472 | st->need_parsing = AVSTREAM_PARSE_FULL; /* for PCM we will read a chunk later and put correct info */ | |
473 | ||
474 | /* set timebase to common denominator of ms and framerate */ | |
475 | avpriv_set_pts_info(st, 64, 1, framerate.num*1000); | |
476 | st->start_time = 0; | |
477 | st->duration = (int64_t)nsv->duration * framerate.num; | |
478 | } | |
479 | } else { | |
480 | if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) { | |
481 | av_dlog(s, "NSV NSVs header values differ from the first one!!!\n"); | |
482 | //return -1; | |
483 | } | |
484 | } | |
485 | ||
486 | nsv->state = NSV_HAS_READ_NSVS; | |
487 | return 0; | |
488 | fail: | |
489 | /* XXX */ | |
490 | nsv->state = NSV_UNSYNC; | |
491 | return -1; | |
492 | } | |
493 | ||
494 | static int nsv_read_header(AVFormatContext *s) | |
495 | { | |
496 | NSVContext *nsv = s->priv_data; | |
497 | int i, err; | |
498 | ||
499 | av_dlog(s, "%s()\n", __FUNCTION__); | |
500 | av_dlog(s, "filename '%s'\n", s->filename); | |
501 | ||
502 | nsv->state = NSV_UNSYNC; | |
503 | nsv->ahead[0].data = nsv->ahead[1].data = NULL; | |
504 | ||
505 | for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) { | |
506 | if (nsv_resync(s) < 0) | |
507 | return -1; | |
508 | if (nsv->state == NSV_FOUND_NSVF) { | |
509 | err = nsv_parse_NSVf_header(s); | |
510 | if (err < 0) | |
511 | return err; | |
512 | } | |
513 | /* we need the first NSVs also... */ | |
514 | if (nsv->state == NSV_FOUND_NSVS) { | |
515 | err = nsv_parse_NSVs_header(s); | |
516 | if (err < 0) | |
517 | return err; | |
518 | break; /* we just want the first one */ | |
519 | } | |
520 | } | |
521 | if (s->nb_streams < 1) /* no luck so far */ | |
522 | return -1; | |
523 | /* now read the first chunk, so we can attempt to decode more info */ | |
524 | err = nsv_read_chunk(s, 1); | |
525 | ||
526 | av_dlog(s, "parsed header\n"); | |
527 | return err; | |
528 | } | |
529 | ||
530 | static int nsv_read_chunk(AVFormatContext *s, int fill_header) | |
531 | { | |
532 | NSVContext *nsv = s->priv_data; | |
533 | AVIOContext *pb = s->pb; | |
534 | AVStream *st[2] = {NULL, NULL}; | |
535 | NSVStream *nst; | |
536 | AVPacket *pkt; | |
537 | int i, err = 0; | |
538 | uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */ | |
539 | uint32_t vsize; | |
540 | uint16_t asize; | |
541 | uint16_t auxsize; | |
542 | ||
543 | av_dlog(s, "%s(%d)\n", __FUNCTION__, fill_header); | |
544 | ||
545 | if (nsv->ahead[0].data || nsv->ahead[1].data) | |
546 | return 0; //-1; /* hey! eat what you've in your plate first! */ | |
547 | ||
548 | null_chunk_retry: | |
549 | if (avio_feof(pb)) | |
550 | return -1; | |
551 | ||
552 | for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++) | |
553 | err = nsv_resync(s); | |
554 | if (err < 0) | |
555 | return err; | |
556 | if (nsv->state == NSV_FOUND_NSVS) | |
557 | err = nsv_parse_NSVs_header(s); | |
558 | if (err < 0) | |
559 | return err; | |
560 | if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF) | |
561 | return -1; | |
562 | ||
563 | auxcount = avio_r8(pb); | |
564 | vsize = avio_rl16(pb); | |
565 | asize = avio_rl16(pb); | |
566 | vsize = (vsize << 4) | (auxcount >> 4); | |
567 | auxcount &= 0x0f; | |
568 | av_dlog(s, "NSV CHUNK %d aux, %u bytes video, %d bytes audio\n", auxcount, vsize, asize); | |
569 | /* skip aux stuff */ | |
570 | for (i = 0; i < auxcount; i++) { | |
571 | uint32_t av_unused auxtag; | |
572 | auxsize = avio_rl16(pb); | |
573 | auxtag = avio_rl32(pb); | |
574 | av_dlog(s, "NSV aux data: '%c%c%c%c', %d bytes\n", | |
575 | (auxtag & 0x0ff), | |
576 | ((auxtag >> 8) & 0x0ff), | |
577 | ((auxtag >> 16) & 0x0ff), | |
578 | ((auxtag >> 24) & 0x0ff), | |
579 | auxsize); | |
580 | avio_skip(pb, auxsize); | |
581 | vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming braindead */ | |
582 | } | |
583 | ||
584 | if (avio_feof(pb)) | |
585 | return -1; | |
586 | if (!vsize && !asize) { | |
587 | nsv->state = NSV_UNSYNC; | |
588 | goto null_chunk_retry; | |
589 | } | |
590 | ||
591 | /* map back streams to v,a */ | |
592 | if (s->nb_streams > 0) | |
593 | st[s->streams[0]->id] = s->streams[0]; | |
594 | if (s->nb_streams > 1) | |
595 | st[s->streams[1]->id] = s->streams[1]; | |
596 | ||
597 | if (vsize && st[NSV_ST_VIDEO]) { | |
598 | nst = st[NSV_ST_VIDEO]->priv_data; | |
599 | pkt = &nsv->ahead[NSV_ST_VIDEO]; | |
600 | av_get_packet(pb, pkt, vsize); | |
601 | pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO; | |
602 | pkt->dts = nst->frame_offset; | |
603 | pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */ | |
604 | for (i = 0; i < FFMIN(8, vsize); i++) | |
605 | av_dlog(s, "NSV video: [%d] = %02x\n", i, pkt->data[i]); | |
606 | } | |
607 | if(st[NSV_ST_VIDEO]) | |
608 | ((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset++; | |
609 | ||
610 | if (asize && st[NSV_ST_AUDIO]) { | |
611 | nst = st[NSV_ST_AUDIO]->priv_data; | |
612 | pkt = &nsv->ahead[NSV_ST_AUDIO]; | |
613 | /* read raw audio specific header on the first audio chunk... */ | |
614 | /* on ALL audio chunks ?? seems so! */ | |
615 | if (asize && st[NSV_ST_AUDIO]->codec->codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) { | |
616 | uint8_t bps; | |
617 | uint8_t channels; | |
618 | uint16_t samplerate; | |
619 | bps = avio_r8(pb); | |
620 | channels = avio_r8(pb); | |
621 | samplerate = avio_rl16(pb); | |
622 | asize-=4; | |
623 | av_dlog(s, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate); | |
624 | if (fill_header) { | |
625 | st[NSV_ST_AUDIO]->need_parsing = AVSTREAM_PARSE_NONE; /* we know everything */ | |
626 | if (bps != 16) { | |
627 | av_dlog(s, "NSV AUDIO bit/sample != 16 (%d)!!!\n", bps); | |
628 | } | |
629 | if(channels) | |
630 | bps /= channels; // ??? | |
631 | else | |
632 | av_log(s, AV_LOG_WARNING, "Channels is 0\n"); | |
633 | if (bps == 8) | |
634 | st[NSV_ST_AUDIO]->codec->codec_id = AV_CODEC_ID_PCM_U8; | |
635 | samplerate /= 4;/* UGH ??? XXX */ | |
636 | channels = 1; | |
637 | st[NSV_ST_AUDIO]->codec->channels = channels; | |
638 | st[NSV_ST_AUDIO]->codec->sample_rate = samplerate; | |
639 | av_dlog(s, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate); | |
640 | } | |
641 | } | |
642 | av_get_packet(pb, pkt, asize); | |
643 | pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO; | |
644 | pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */ | |
645 | if( nsv->state == NSV_HAS_READ_NSVS && st[NSV_ST_VIDEO] ) { | |
646 | /* on a nsvs frame we have new information on a/v sync */ | |
647 | pkt->dts = (((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset-1); | |
648 | pkt->dts *= (int64_t)1000 * nsv->framerate.den; | |
649 | pkt->dts += (int64_t)nsv->avsync * nsv->framerate.num; | |
650 | av_dlog(s, "NSV AUDIO: sync:%d, dts:%"PRId64, nsv->avsync, pkt->dts); | |
651 | } | |
652 | nst->frame_offset++; | |
653 | } | |
654 | ||
655 | nsv->state = NSV_UNSYNC; | |
656 | return 0; | |
657 | } | |
658 | ||
659 | ||
660 | static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt) | |
661 | { | |
662 | NSVContext *nsv = s->priv_data; | |
663 | int i, err = 0; | |
664 | ||
665 | av_dlog(s, "%s()\n", __FUNCTION__); | |
666 | ||
667 | /* in case we don't already have something to eat ... */ | |
668 | if (!nsv->ahead[0].data && !nsv->ahead[1].data) | |
669 | err = nsv_read_chunk(s, 0); | |
670 | if (err < 0) | |
671 | return err; | |
672 | ||
673 | /* now pick one of the plates */ | |
674 | for (i = 0; i < 2; i++) { | |
675 | if (nsv->ahead[i].data) { | |
676 | av_dlog(s, "%s: using cached packet[%d]\n", __FUNCTION__, i); | |
677 | /* avoid the cost of new_packet + memcpy(->data) */ | |
678 | memcpy(pkt, &nsv->ahead[i], sizeof(AVPacket)); | |
679 | nsv->ahead[i].data = NULL; /* we ate that one */ | |
680 | return pkt->size; | |
681 | } | |
682 | } | |
683 | ||
684 | /* this restaurant is not approvisionned :^] */ | |
685 | return -1; | |
686 | } | |
687 | ||
688 | static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) | |
689 | { | |
690 | NSVContext *nsv = s->priv_data; | |
691 | AVStream *st = s->streams[stream_index]; | |
692 | NSVStream *nst = st->priv_data; | |
693 | int index; | |
694 | ||
695 | index = av_index_search_timestamp(st, timestamp, flags); | |
696 | if(index < 0) | |
697 | return -1; | |
698 | ||
699 | if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0) | |
700 | return -1; | |
701 | ||
702 | nst->frame_offset = st->index_entries[index].timestamp; | |
703 | nsv->state = NSV_UNSYNC; | |
704 | return 0; | |
705 | } | |
706 | ||
707 | static int nsv_read_close(AVFormatContext *s) | |
708 | { | |
709 | NSVContext *nsv = s->priv_data; | |
710 | ||
711 | av_freep(&nsv->nsvs_file_offset); | |
712 | av_freep(&nsv->nsvs_timestamps); | |
713 | if (nsv->ahead[0].data) | |
714 | av_free_packet(&nsv->ahead[0]); | |
715 | if (nsv->ahead[1].data) | |
716 | av_free_packet(&nsv->ahead[1]); | |
717 | return 0; | |
718 | } | |
719 | ||
720 | static int nsv_probe(AVProbeData *p) | |
721 | { | |
722 | int i, score = 0; | |
723 | ||
724 | av_dlog(NULL, "nsv_probe(), buf_size %d\n", p->buf_size); | |
725 | /* check file header */ | |
726 | /* streamed files might not have any header */ | |
727 | if (p->buf[0] == 'N' && p->buf[1] == 'S' && | |
728 | p->buf[2] == 'V' && (p->buf[3] == 'f' || p->buf[3] == 's')) | |
729 | return AVPROBE_SCORE_MAX; | |
730 | /* XXX: do streamed files always start at chunk boundary ?? */ | |
731 | /* or do we need to search NSVs in the byte stream ? */ | |
732 | /* seems the servers don't bother starting clean chunks... */ | |
733 | /* sometimes even the first header is at 9KB or something :^) */ | |
734 | for (i = 1; i < p->buf_size - 3; i++) { | |
735 | if (AV_RL32(p->buf + i) == AV_RL32("NSVs")) { | |
736 | /* Get the chunk size and check if at the end we are getting 0xBEEF */ | |
737 | int vsize = AV_RL24(p->buf+i+19) >> 4; | |
738 | int asize = AV_RL16(p->buf+i+22); | |
739 | int offset = i + 23 + asize + vsize + 1; | |
740 | if (offset <= p->buf_size - 2 && AV_RL16(p->buf + offset) == 0xBEEF) | |
741 | return 4*AVPROBE_SCORE_MAX/5; | |
742 | score = AVPROBE_SCORE_MAX/5; | |
743 | } | |
744 | } | |
745 | /* so we'll have more luck on extension... */ | |
746 | if (av_match_ext(p->filename, "nsv")) | |
747 | return AVPROBE_SCORE_EXTENSION; | |
748 | /* FIXME: add mime-type check */ | |
749 | return score; | |
750 | } | |
751 | ||
752 | AVInputFormat ff_nsv_demuxer = { | |
753 | .name = "nsv", | |
754 | .long_name = NULL_IF_CONFIG_SMALL("Nullsoft Streaming Video"), | |
755 | .priv_data_size = sizeof(NSVContext), | |
756 | .read_probe = nsv_probe, | |
757 | .read_header = nsv_read_header, | |
758 | .read_packet = nsv_read_packet, | |
759 | .read_close = nsv_read_close, | |
760 | .read_seek = nsv_read_seek, | |
761 | }; |