FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/nsvdec.c
Date: 2026-04-24 19:58:39
Exec Total Coverage
Lines: 240 339 70.8%
Functions: 8 9 88.9%
Branches: 118 218 54.1%
Line Branch Exec Source
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 "libavutil/mem.h"
27 #include "avformat.h"
28 #include "demux.h"
29 #include "internal.h"
30 #include "libavutil/dict.h"
31 #include "libavutil/intreadwrite.h"
32
33 /* max bytes to crawl for trying to resync
34 * stupid streaming servers don't start at chunk boundaries...
35 */
36 #define NSV_MAX_RESYNC (500*1024)
37 #define NSV_MAX_RESYNC_TRIES 300
38
39 /*
40 * References:
41 * (1) http://www.multimedia.cx/nsv-format.txt
42 * seems someone came to the same conclusions as me, and updated it:
43 * (2) http://www.stud.ktu.lt/~vitslav/nsv/nsv-format.txt
44 * http://www.stud.ktu.lt/~vitslav/nsv/
45 * official docs
46 * (3) http://ultravox.aol.com/NSVFormat.rtf
47 * Sample files:
48 * (S1) http://www.nullsoft.com/nsv/samples/
49 * http://www.nullsoft.com/nsv/samples/faster.nsv
50 * http://streamripper.sourceforge.net/openbb/read.php?TID=492&page=4
51 */
52
53 /*
54 * notes on the header (Francois Revol):
55 *
56 * It is followed by strings, then a table, but nothing tells
57 * where the table begins according to (1). After checking faster.nsv,
58 * I believe NVSf[16-19] gives the size of the strings data
59 * (that is the offset of the data table after the header).
60 * After checking all samples from (S1) all confirms this.
61 *
62 * Then, about NSVf[12-15], faster.nsf has 179700. When viewing it in VLC,
63 * I noticed there was about 1 NVSs chunk/s, so I ran
64 * strings faster.nsv | grep NSVs | wc -l
65 * which gave me 180. That leads me to think that NSVf[12-15] might be the
66 * file length in milliseconds.
67 * Let's try that:
68 * 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
69 * except for nsvtrailer (which doesn't have an NSVf header), it reports correct time.
70 *
71 * nsvtrailer.nsv (S1) does not have any NSVf header, only NSVs chunks,
72 * so the header seems to not be mandatory. (for streaming).
73 *
74 * index slice duration check (excepts nsvtrailer.nsv):
75 * 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, slice time $(($DUR/$IC))"; done
76 */
77
78 /*
79 * TODO:
80 * - handle timestamps !!!
81 * - use index
82 * - mime-type in probe()
83 * - seek
84 */
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 ??? no one 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; /* av_assert0(vwidth%16==0) */
102 uint16_t vheight; /* av_assert0(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 indexes */
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 NSVContext {
168 int base_offset;
169 int NSVf_end;
170 uint32_t *nsvs_file_offset;
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 int16_t avsync;
179 AVRational framerate;
180 uint32_t *nsvs_timestamps;
181 int nsvf;
182 } NSVContext;
183
184 static const AVCodecTag nsv_codec_video_tags[] = {
185 { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') },
186 { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
187 { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
188 { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') },
189 { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
190 { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') },
191 { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') },
192 { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') },
193 { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
194 { AV_CODEC_ID_VP8, MKTAG('V', 'P', '8', '0') },
195 /*
196 { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') },
197 { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') },
198 */
199 { AV_CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */
200 { AV_CODEC_ID_H264, MKTAG('H', '2', '6', '4') },
201 { AV_CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') },
202 { AV_CODEC_ID_NONE, 0 },
203 };
204
205 static const AVCodecTag nsv_codec_audio_tags[] = {
206 { AV_CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') },
207 { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'C', ' ') },
208 { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'C', 'P') },
209 { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'V', ' ') },
210 { AV_CODEC_ID_AAC, MKTAG('V', 'L', 'B', ' ') },
211 { AV_CODEC_ID_SPEEX, MKTAG('S', 'P', 'X', ' ') },
212 { AV_CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') },
213 { AV_CODEC_ID_NONE, 0 },
214 };
215
216 //static int nsv_load_index(AVFormatContext *s);
217 static int nsv_read_chunk(AVFormatContext *s, int fill_header);
218
219 /* try to find something we recognize, and set the state accordingly */
220 93 static int nsv_resync(AVFormatContext *s)
221 {
222 93 NSVContext *nsv = s->priv_data;
223 93 AVIOContext *pb = s->pb;
224 93 uint32_t v = 0;
225 int i;
226
227
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 198 for (i = 0; i < NSV_MAX_RESYNC; i++) {
228
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 198 if (avio_feof(pb)) {
229 ✗ av_log(s, AV_LOG_TRACE, "NSV EOF\n");
230 ✗ nsv->state = NSV_UNSYNC;
231 ✗ return -1;
232 }
233 198 v <<= 8;
234 198 v |= avio_r8(pb);
235
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 198 if (i < 8) {
236 198 av_log(s, AV_LOG_TRACE, "NSV resync: [%d] = %02"PRIx32"\n", i, v & 0x0FF);
237 }
238
239
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 198 if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */
240 87 av_log(s, AV_LOG_TRACE, "NSV resynced on BEEF after %d bytes\n", i+1);
241 87 nsv->state = NSV_FOUND_BEEF;
242 87 return 0;
243 }
244 /* we read as big-endian, thus the MK*BE* */
245
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 111 if (v == TB_NSVF) { /* NSVf */
246 1 av_log(s, AV_LOG_TRACE, "NSV resynced on NSVf after %d bytes\n", i+1);
247 1 nsv->state = NSV_FOUND_NSVF;
248 1 return 0;
249 }
250
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 110 if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */
251 5 av_log(s, AV_LOG_TRACE, "NSV resynced on NSVs after %d bytes\n", i+1);
252 5 nsv->state = NSV_FOUND_NSVS;
253 5 return 0;
254 }
255
256 }
257 ✗ av_log(s, AV_LOG_TRACE, "NSV sync lost\n");
258 ✗ return -1;
259 }
260
261 1 static int nsv_parse_NSVf_header(AVFormatContext *s)
262 {
263 1 NSVContext *nsv = s->priv_data;
264 1 AVIOContext *pb = s->pb;
265 av_unused unsigned int file_size;
266 unsigned int size;
267 int64_t duration;
268 int strings_size;
269 int table_entries;
270 int table_entries_used;
271
272 1 nsv->state = NSV_UNSYNC; /* in case we fail */
273
274
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 1 if (nsv->nsvf) {
275 ✗ av_log(s, AV_LOG_TRACE, "Multiple NSVf\n");
276 ✗ return 0;
277 }
278 1 nsv->nsvf = 1;
279
280 1 size = avio_rl32(pb);
281
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 1 if (size < 28)
282 ✗ return -1;
283 1 nsv->NSVf_end = size;
284
285 1 file_size = (uint32_t)avio_rl32(pb);
286 1 av_log(s, AV_LOG_TRACE, "NSV NSVf chunk_size %u\n", size);
287 1 av_log(s, AV_LOG_TRACE, "NSV NSVf file_size %u\n", file_size);
288
289 1 nsv->duration = duration = avio_rl32(pb); /* in ms */
290 1 av_log(s, AV_LOG_TRACE, "NSV NSVf duration %"PRId64" ms\n", duration);
291 // XXX: store it in AVStreams
292
293 1 strings_size = avio_rl32(pb);
294 1 table_entries = avio_rl32(pb);
295 1 table_entries_used = avio_rl32(pb);
296 1 av_log(s, AV_LOG_TRACE, "NSV NSVf info-strings size: %d, table entries: %d, bis %d\n",
297 strings_size, table_entries, table_entries_used);
298
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 1 if (avio_feof(pb))
299 ✗ return -1;
300
301 1 av_log(s, AV_LOG_TRACE, "NSV got header; filepos %"PRId64"\n", avio_tell(pb));
302
303
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 1 if (strings_size > 0) {
304 char *strings; /* last byte will be '\0' to play safe with str*() */
305 char *p, *endp;
306 char *token, *value;
307 char quote;
308
309 1 p = strings = av_mallocz((size_t)strings_size + 1);
310
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 1 if (!p)
311 ✗ return AVERROR(ENOMEM);
312 1 endp = strings + strings_size;
313 1 avio_read(pb, strings, strings_size);
314
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 2 while (p < endp) {
315
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 1 while (*p == ' ')
316 ✗ p++; /* strip out spaces */
317
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 1 if (p >= endp-2)
318 ✗ break;
319 1 token = p;
320 1 p = strchr(p, '=');
321
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 1 if (!p || p >= endp-2)
322 break;
323 1 *p++ = '\0';
324 1 quote = *p++;
325 1 value = p;
326 1 p = strchr(p, quote);
327
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 1 if (!p || p >= endp)
328 break;
329 1 *p++ = '\0';
330 1 av_log(s, AV_LOG_TRACE, "NSV NSVf INFO: %s='%s'\n", token, value);
331 1 av_dict_set(&s->metadata, token, value, 0);
332 }
333 1 av_free(strings);
334 }
335
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 1 if (avio_feof(pb))
336 ✗ return -1;
337
338 1 av_log(s, AV_LOG_TRACE, "NSV got infos; filepos %"PRId64"\n", avio_tell(pb));
339
340
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 1 if (table_entries_used > 0) {
341 int i;
342 1 nsv->index_entries = table_entries_used;
343
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 1 if((unsigned)table_entries_used >= UINT_MAX / sizeof(uint32_t))
344 ✗ return -1;
345 1 nsv->nsvs_file_offset = av_malloc_array((unsigned)table_entries_used, sizeof(uint32_t));
346
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 1 if (!nsv->nsvs_file_offset)
347 ✗ return AVERROR(ENOMEM);
348
349
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 101 for(i=0;i<table_entries_used;i++) {
350
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 100 if (avio_feof(pb))
351 ✗ return AVERROR_INVALIDDATA;
352 100 nsv->nsvs_file_offset[i] = avio_rl32(pb) + size;
353 }
354
355
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 1 if(table_entries > table_entries_used &&
356 ✗ avio_rl32(pb) == MKTAG('T','O','C','2')) {
357 ✗ nsv->nsvs_timestamps = av_malloc_array((unsigned)table_entries_used, sizeof(uint32_t));
358 ✗ if (!nsv->nsvs_timestamps)
359 ✗ return AVERROR(ENOMEM);
360 ✗ for(i=0;i<table_entries_used;i++) {
361 ✗ nsv->nsvs_timestamps[i] = avio_rl32(pb);
362 }
363 }
364 }
365
366 1 av_log(s, AV_LOG_TRACE, "NSV got index; filepos %"PRId64"\n", avio_tell(pb));
367
368 1 avio_seek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */
369
370
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 1 if (avio_feof(pb))
371 ✗ return -1;
372 1 nsv->state = NSV_HAS_READ_NSVF;
373 1 return 0;
374 }
375
376 5 static int nsv_parse_NSVs_header(AVFormatContext *s)
377 {
378 5 NSVContext *nsv = s->priv_data;
379 5 AVIOContext *pb = s->pb;
380 uint32_t vtag, atag;
381 uint16_t vwidth, vheight;
382 AVRational framerate;
383 int i;
384 AVStream *st;
385 NSVStream *nst;
386
387 5 vtag = avio_rl32(pb);
388 5 atag = avio_rl32(pb);
389 5 vwidth = avio_rl16(pb);
390 5 vheight = avio_rl16(pb);
391 5 i = avio_r8(pb);
392
393 5 av_log(s, AV_LOG_TRACE, "NSV NSVs framerate code %2x\n", i);
394
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 5 if(i&0x80) { /* odd way of giving native framerates from docs */
395 5 int t=(i & 0x7F)>>2;
396
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 5 if(t<16) framerate = (AVRational){1, t+1};
397 ✗ else framerate = (AVRational){t-15, 1};
398
399
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 5 if(i&1){
400 5 framerate.num *= 1000;
401 5 framerate.den *= 1001;
402 }
403
404
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 5 if((i&3)==3) framerate.num *= 24;
405
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 5 else if((i&3)==2) framerate.num *= 25;
406 5 else framerate.num *= 30;
407 }
408 else
409 ✗ framerate= (AVRational){i, 1};
410
411 5 nsv->avsync = avio_rl16(pb);
412 5 nsv->framerate = framerate;
413
414 5 av_log(s, AV_LOG_TRACE, "NSV NSVs vsize %dx%d\n", vwidth, vheight);
415
416 /* XXX change to ap != NULL ? */
417
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 5 if (s->nb_streams == 0) { /* streams not yet published, let's do that */
418 1 nsv->vtag = vtag;
419 1 nsv->atag = atag;
420 1 nsv->vwidth = vwidth;
421 1 nsv->vheight = vwidth;
422
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 1 if (vtag != T_NONE) {
423 int i;
424 1 st = avformat_new_stream(s, NULL);
425
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 1 if (!st)
426 ✗ goto fail;
427
428 1 st->id = NSV_ST_VIDEO;
429 1 nst = av_mallocz(sizeof(NSVStream));
430
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 1 if (!nst)
431 ✗ goto fail;
432 1 st->priv_data = nst;
433 1 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
434 1 st->codecpar->codec_tag = vtag;
435 1 st->codecpar->codec_id = ff_codec_get_id(nsv_codec_video_tags, vtag);
436 1 st->codecpar->width = vwidth;
437 1 st->codecpar->height = vheight;
438 1 st->codecpar->bits_per_coded_sample = 24; /* depth XXX */
439
440 1 avpriv_set_pts_info(st, 64, framerate.den, framerate.num);
441 1 st->start_time = 0;
442 1 st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den);
443
444
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 101 for(i=0;i<nsv->index_entries;i++) {
445
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 100 if(nsv->nsvs_timestamps) {
446 ✗ av_add_index_entry(st, nsv->nsvs_file_offset[i], nsv->nsvs_timestamps[i],
447 0, 0, AVINDEX_KEYFRAME);
448 } else {
449 100 int64_t ts = av_rescale(i*nsv->duration/nsv->index_entries, framerate.num, 1000*framerate.den);
450 100 av_add_index_entry(st, nsv->nsvs_file_offset[i], ts, 0, 0, AVINDEX_KEYFRAME);
451 }
452 }
453 }
454
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 1 if (atag != T_NONE) {
455 1 st = avformat_new_stream(s, NULL);
456
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 1 if (!st)
457 ✗ goto fail;
458
459 1 st->id = NSV_ST_AUDIO;
460 1 nst = av_mallocz(sizeof(NSVStream));
461
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 1 if (!nst)
462 ✗ goto fail;
463 1 st->priv_data = nst;
464 1 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
465 1 st->codecpar->codec_tag = atag;
466 1 st->codecpar->codec_id = ff_codec_get_id(nsv_codec_audio_tags, atag);
467
468
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 1 if (atag == MKTAG('A', 'A', 'V', ' ')) {
469 static const uint8_t aav_pce[] = {
470 0x12, 0x00, 0x05, 0x08, 0x48, 0x00,
471 0x20, 0x00, 0xC6, 0x40, 0x04, 0x4C,
472 0x61, 0x76, 0x63, 0x56, 0xE5, 0x00,
473 0x00, 0x00,
474 };
475 int ret;
476
477 ✗ if ((ret = ff_alloc_extradata(st->codecpar, sizeof(aav_pce))) < 0)
478 ✗ return ret;
479
480 ✗ st->codecpar->sample_rate = 44100;
481 ✗ memcpy(st->codecpar->extradata, aav_pce, sizeof(aav_pce));
482 }
483
484 1 ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL; /* for PCM we will read a chunk later and put correct info */
485
486 /* set timebase to common denominator of ms and framerate */
487 1 avpriv_set_pts_info(st, 64, 1, framerate.num*1000);
488 1 st->start_time = 0;
489 1 st->duration = (int64_t)nsv->duration * framerate.num;
490 }
491 } else {
492
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 4 if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) {
493 ✗ av_log(s, AV_LOG_TRACE, "NSV NSVs header values differ from the first one!!!\n");
494 //return -1;
495 }
496 }
497
498 5 nsv->state = NSV_HAS_READ_NSVS;
499 5 return 0;
500 ✗ fail:
501 /* XXX */
502 ✗ nsv->state = NSV_UNSYNC;
503 ✗ return -1;
504 }
505
506 1 static int nsv_read_header(AVFormatContext *s)
507 {
508 1 NSVContext *nsv = s->priv_data;
509 int i, err;
510
511 1 nsv->state = NSV_UNSYNC;
512 1 nsv->ahead[0].data = nsv->ahead[1].data = NULL;
513
514
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 2 for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
515 2 err = nsv_resync(s);
516
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 2 if (err < 0)
517 ✗ return err;
518
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 2 if (nsv->state == NSV_FOUND_NSVF) {
519 1 err = nsv_parse_NSVf_header(s);
520
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 1 if (err < 0)
521 ✗ return err;
522 }
523 /* we need the first NSVs also... */
524
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 2 if (nsv->state == NSV_FOUND_NSVS) {
525 1 err = nsv_parse_NSVs_header(s);
526
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 1 if (err < 0)
527 ✗ return err;
528 1 break; /* we just want the first one */
529 }
530 }
531
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 1 if (s->nb_streams < 1) /* no luck so far */
532 ✗ return AVERROR_INVALIDDATA;
533
534 /* now read the first chunk, so we can attempt to decode more info */
535 1 err = nsv_read_chunk(s, 1);
536
537 1 av_log(s, AV_LOG_TRACE, "parsed header\n");
538 1 return err;
539 }
540
541 92 static int nsv_read_chunk(AVFormatContext *s, int fill_header)
542 {
543 92 NSVContext *nsv = s->priv_data;
544 92 AVIOContext *pb = s->pb;
545 92 AVStream *st[2] = {NULL, NULL};
546 NSVStream *nst;
547 AVPacket *pkt;
548 92 int i, err = 0;
549 uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */
550 uint32_t vsize;
551 uint16_t asize;
552 uint16_t auxsize;
553 int ret;
554
555
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 92 if (nsv->ahead[0].data || nsv->ahead[1].data)
556 ✗ return 0; //-1; /* hey! eat what you've in your plate first! */
557
558 92 null_chunk_retry:
559
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 92 if (avio_feof(pb))
560 ✗ return -1;
561
562
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 183 for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++)
563 91 err = nsv_resync(s);
564
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 92 if (err < 0)
565 ✗ return err;
566
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 92 if (nsv->state == NSV_FOUND_NSVS)
567 4 err = nsv_parse_NSVs_header(s);
568
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 92 if (err < 0)
569 ✗ return err;
570
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 92 if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF)
571 ✗ return -1;
572
573 92 auxcount = avio_r8(pb);
574 92 vsize = avio_rl16(pb);
575 92 asize = avio_rl16(pb);
576 92 vsize = (vsize << 4) | (auxcount >> 4);
577 92 auxcount &= 0x0f;
578 92 av_log(s, AV_LOG_TRACE, "NSV CHUNK %d aux, %"PRIu32" bytes video, %d bytes audio\n", auxcount, vsize, asize);
579 /* skip aux stuff */
580
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 92 for (i = 0; i < auxcount; i++) {
581 av_unused uint32_t auxtag;
582 ✗ auxsize = avio_rl16(pb);
583 ✗ auxtag = avio_rl32(pb);
584 ✗ avio_skip(pb, auxsize);
585 ✗ vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming brain-dead */
586 }
587
588
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 92 if (avio_feof(pb))
589 ✗ return -1;
590
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 92 if (!vsize && !asize) {
591 ✗ nsv->state = NSV_UNSYNC;
592 ✗ goto null_chunk_retry;
593 }
594
595 /* map back streams to v,a */
596
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 92 if (s->nb_streams > 0)
597 92 st[s->streams[0]->id] = s->streams[0];
598
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 92 if (s->nb_streams > 1)
599 92 st[s->streams[1]->id] = s->streams[1];
600
601
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 92 if (vsize && st[NSV_ST_VIDEO]) {
602 60 nst = st[NSV_ST_VIDEO]->priv_data;
603 60 pkt = &nsv->ahead[NSV_ST_VIDEO];
604
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 60 if ((ret = av_get_packet(pb, pkt, vsize)) < 0)
605 ✗ return ret;
606 60 pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO;
607 60 pkt->dts = nst->frame_offset;
608 60 pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
609
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 540 for (i = 0; i < FFMIN(8, vsize); i++)
610 480 av_log(s, AV_LOG_TRACE, "NSV video: [%d] = %02x\n", i, pkt->data[i]);
611 }
612
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 92 if(st[NSV_ST_VIDEO])
613 92 ((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset++;
614
615
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 92 if (asize && st[NSV_ST_AUDIO]) {
616 88 nst = st[NSV_ST_AUDIO]->priv_data;
617 88 pkt = &nsv->ahead[NSV_ST_AUDIO];
618 /* read raw audio specific header on the first audio chunk... */
619 /* on ALL audio chunks ?? seems so! */
620
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 88 if (asize >= 4 && st[NSV_ST_AUDIO]->codecpar->codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) {
621 uint8_t bps;
622 uint8_t channels;
623 uint16_t samplerate;
624 ✗ bps = avio_r8(pb);
625 ✗ channels = avio_r8(pb);
626 ✗ samplerate = avio_rl16(pb);
627 ✗ if (!channels || !samplerate)
628 ✗ return AVERROR_INVALIDDATA;
629 ✗ asize-=4;
630 ✗ av_log(s, AV_LOG_TRACE, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate);
631 ✗ if (fill_header) {
632 ✗ ffstream(st[NSV_ST_AUDIO])->need_parsing = AVSTREAM_PARSE_NONE; /* we know everything */
633 ✗ if (bps != 16) {
634 ✗ av_log(s, AV_LOG_TRACE, "NSV AUDIO bit/sample != 16 (%d)!!!\n", bps);
635 }
636 ✗ bps /= channels; // ???
637 ✗ if (bps == 8)
638 ✗ st[NSV_ST_AUDIO]->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
639 ✗ samplerate /= 4;/* UGH ??? XXX */
640 ✗ channels = 1;
641 ✗ st[NSV_ST_AUDIO]->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
642 ✗ st[NSV_ST_AUDIO]->codecpar->sample_rate = samplerate;
643 ✗ av_log(s, AV_LOG_TRACE, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate);
644 }
645 }
646
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 88 if ((ret = av_get_packet(pb, pkt, asize)) < 0)
647 ✗ return ret;
648 88 pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO;
649 88 pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
650
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 88 if( nsv->state == NSV_HAS_READ_NSVS && st[NSV_ST_VIDEO] ) {
651 /* on a nsvs frame we have new information on a/v sync */
652 4 pkt->dts = (((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset-1);
653 4 pkt->dts *= (int64_t)1000 * nsv->framerate.den;
654 4 pkt->dts += (int64_t)nsv->avsync * nsv->framerate.num;
655 4 av_log(s, AV_LOG_TRACE, "NSV AUDIO: sync:%d, dts:%"PRId64, nsv->avsync, pkt->dts);
656 }
657 88 nst->frame_offset++;
658 }
659
660 92 nsv->state = NSV_UNSYNC;
661 92 return 0;
662 }
663
664
665 148 static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
666 {
667 148 NSVContext *nsv = s->priv_data;
668 148 int i, err = 0;
669
670 /* in case we don't already have something to eat ... */
671
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 148 if (!nsv->ahead[0].data && !nsv->ahead[1].data)
672 91 err = nsv_read_chunk(s, 0);
673
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 148 if (err < 0)
674 ✗ return err;
675
676 /* now pick one of the plates */
677
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 236 for (i = 0; i < 2; i++) {
678
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 236 if (nsv->ahead[i].data) {
679 148 av_packet_move_ref(pkt, &nsv->ahead[i]);
680 148 return 0;
681 }
682 }
683
684 /* this restaurant is not provisioned :^] */
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 ✗ FFStream *const sti = ffstream(st);
693 ✗ NSVStream *nst = st->priv_data;
694 int index;
695
696 ✗ index = av_index_search_timestamp(st, timestamp, flags);
697 ✗ if(index < 0)
698 ✗ return -1;
699
700 ✗ if (avio_seek(s->pb, sti->index_entries[index].pos, SEEK_SET) < 0)
701 ✗ return -1;
702
703 ✗ nst->frame_offset = sti->index_entries[index].timestamp;
704 ✗ nsv->state = NSV_UNSYNC;
705 ✗ return 0;
706 }
707
708 1 static int nsv_read_close(AVFormatContext *s)
709 {
710 1 NSVContext *nsv = s->priv_data;
711
712 1 av_freep(&nsv->nsvs_file_offset);
713 1 av_freep(&nsv->nsvs_timestamps);
714
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 1 if (nsv->ahead[0].data)
715 ✗ av_packet_unref(&nsv->ahead[0]);
716
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 1 if (nsv->ahead[1].data)
717 ✗ av_packet_unref(&nsv->ahead[1]);
718 1 return 0;
719 }
720
721 7480 static int nsv_probe(const AVProbeData *p)
722 {
723 7480 int i, score = 0;
724
725 /* check file header */
726 /* streamed files might not have any header */
727
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 7480 if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
728
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 1 p->buf[2] == 'V' && (p->buf[3] == 'f' || p->buf[3] == 's'))
729 1 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
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 417580072 for (i = 1; i < p->buf_size - 3; i++) {
735
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 417572593 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
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 7479 if (av_match_ext(p->filename, "nsv"))
747 ✗ return AVPROBE_SCORE_EXTENSION;
748 /* FIXME: add mime-type check */
749 7479 return score;
750 }
751
752 const FFInputFormat ff_nsv_demuxer = {
753 .p.name = "nsv",
754 .p.long_name = NULL_IF_CONFIG_SMALL("Nullsoft Streaming Video"),
755 .priv_data_size = sizeof(NSVContext),
756 .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
757 .read_probe = nsv_probe,
758 .read_header = nsv_read_header,
759 .read_packet = nsv_read_packet,
760 .read_close = nsv_read_close,
761 .read_seek = nsv_read_seek,
762 };
763