FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/nsvdec.c
Date: 2024-03-29 11:55:30
Exec Total Coverage
Lines: 241 339 71.1%
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 "avformat.h"
27 #include "demux.h"
28 #include "internal.h"
29 #include "libavutil/dict.h"
30 #include "libavutil/intreadwrite.h"
31
32 /* max bytes to crawl for trying to resync
33 * stupid streaming servers don't start at chunk boundaries...
34 */
35 #define NSV_MAX_RESYNC (500*1024)
36 #define NSV_MAX_RESYNC_TRIES 300
37
38 /*
39 * References:
40 * (1) http://www.multimedia.cx/nsv-format.txt
41 * seems someone came to the same conclusions as me, and updated it:
42 * (2) http://www.stud.ktu.lt/~vitslav/nsv/nsv-format.txt
43 * http://www.stud.ktu.lt/~vitslav/nsv/
44 * official docs
45 * (3) http://ultravox.aol.com/NSVFormat.rtf
46 * Sample files:
47 * (S1) http://www.nullsoft.com/nsv/samples/
48 * http://www.nullsoft.com/nsv/samples/faster.nsv
49 * http://streamripper.sourceforge.net/openbb/read.php?TID=492&page=4
50 */
51
52 /*
53 * notes on the header (Francois Revol):
54 *
55 * It is followed by strings, then a table, but nothing tells
56 * where the table begins according to (1). After checking faster.nsv,
57 * I believe NVSf[16-19] gives the size of the strings data
58 * (that is the offset of the data table after the header).
59 * After checking all samples from (S1) all confirms this.
60 *
61 * Then, about NSVf[12-15], faster.nsf has 179700. When viewing it in VLC,
62 * I noticed there was about 1 NVSs chunk/s, so I ran
63 * strings faster.nsv | grep NSVs | wc -l
64 * which gave me 180. That leads me to think that NSVf[12-15] might be the
65 * file length in milliseconds.
66 * Let's try that:
67 * 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
68 * except for nsvtrailer (which doesn't have an NSVf header), it reports correct time.
69 *
70 * nsvtrailer.nsv (S1) does not have any NSVf header, only NSVs chunks,
71 * so the header seems to not be mandatory. (for streaming).
72 *
73 * index slice duration check (excepts nsvtrailer.nsv):
74 * 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
75 */
76
77 /*
78 * TODO:
79 * - handle timestamps !!!
80 * - use index
81 * - mime-type in probe()
82 * - seek
83 */
84
85 #if 0
86 struct NSVf_header {
87 uint32_t chunk_tag; /* 'NSVf' */
88 uint32_t chunk_size;
89 uint32_t file_size; /* max 4GB ??? no one learns anything it seems :^) */
90 uint32_t file_length; //unknown1; /* what about MSB of file_size ? */
91 uint32_t info_strings_size; /* size of the info strings */ //unknown2;
92 uint32_t table_entries;
93 uint32_t table_entries_used; /* the left ones should be -1 */
94 };
95
96 struct NSVs_header {
97 uint32_t chunk_tag; /* 'NSVs' */
98 uint32_t v4cc; /* or 'NONE' */
99 uint32_t a4cc; /* or 'NONE' */
100 uint16_t vwidth; /* av_assert0(vwidth%16==0) */
101 uint16_t vheight; /* av_assert0(vheight%16==0) */
102 uint8_t framerate; /* value = (framerate&0x80)?frtable[frameratex0x7f]:framerate */
103 uint16_t unknown;
104 };
105
106 struct nsv_avchunk_header {
107 uint8_t vchunk_size_lsb;
108 uint16_t vchunk_size_msb; /* value = (vchunk_size_msb << 4) | (vchunk_size_lsb >> 4) */
109 uint16_t achunk_size;
110 };
111
112 struct nsv_pcm_header {
113 uint8_t bits_per_sample;
114 uint8_t channel_count;
115 uint16_t sample_rate;
116 };
117 #endif
118
119 /* variation from avi.h */
120 /*typedef struct CodecTag {
121 int id;
122 unsigned int tag;
123 } CodecTag;*/
124
125 /* tags */
126
127 #define T_NSVF MKTAG('N', 'S', 'V', 'f') /* file header */
128 #define T_NSVS MKTAG('N', 'S', 'V', 's') /* chunk header */
129 #define T_TOC2 MKTAG('T', 'O', 'C', '2') /* extra index marker */
130 #define T_NONE MKTAG('N', 'O', 'N', 'E') /* null a/v 4CC */
131 #define T_SUBT MKTAG('S', 'U', 'B', 'T') /* subtitle aux data */
132 #define T_ASYN MKTAG('A', 'S', 'Y', 'N') /* async a/v aux marker */
133 #define T_KEYF MKTAG('K', 'E', 'Y', 'F') /* video keyframe aux marker (addition) */
134
135 #define TB_NSVF MKBETAG('N', 'S', 'V', 'f')
136 #define TB_NSVS MKBETAG('N', 'S', 'V', 's')
137
138 /* hardcoded stream indexes */
139 #define NSV_ST_VIDEO 0
140 #define NSV_ST_AUDIO 1
141 #define NSV_ST_SUBT 2
142
143 enum NSVStatus {
144 NSV_UNSYNC,
145 NSV_FOUND_NSVF,
146 NSV_HAS_READ_NSVF,
147 NSV_FOUND_NSVS,
148 NSV_HAS_READ_NSVS,
149 NSV_FOUND_BEEF,
150 NSV_GOT_VIDEO,
151 NSV_GOT_AUDIO,
152 };
153
154 typedef struct NSVStream {
155 int frame_offset; /* current frame (video) or byte (audio) counter
156 (used to compute the pts) */
157 int scale;
158 int rate;
159 int sample_size; /* audio only data */
160 int start;
161
162 int new_frame_offset; /* temporary storage (used during seek) */
163 int cum_len; /* temporary storage (used during seek) */
164 } NSVStream;
165
166 typedef struct NSVContext {
167 int base_offset;
168 int NSVf_end;
169 uint32_t *nsvs_file_offset;
170 int index_entries;
171 enum NSVStatus state;
172 AVPacket ahead[2]; /* [v, a] if .data is !NULL there is something */
173 /* cached */
174 int64_t duration;
175 uint32_t vtag, atag;
176 uint16_t vwidth, vheight;
177 int16_t avsync;
178 AVRational framerate;
179 uint32_t *nsvs_timestamps;
180 int nsvf;
181 } NSVContext;
182
183 static const AVCodecTag nsv_codec_video_tags[] = {
184 { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') },
185 { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
186 { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
187 { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') },
188 { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
189 { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') },
190 { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') },
191 { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') },
192 { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
193 { AV_CODEC_ID_VP8, MKTAG('V', 'P', '8', '0') },
194 /*
195 { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') },
196 { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') },
197 */
198 { AV_CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */
199 { AV_CODEC_ID_H264, MKTAG('H', '2', '6', '4') },
200 { AV_CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') },
201 { AV_CODEC_ID_NONE, 0 },
202 };
203
204 static const AVCodecTag nsv_codec_audio_tags[] = {
205 { AV_CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') },
206 { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'C', ' ') },
207 { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'C', 'P') },
208 { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'V', ' ') },
209 { AV_CODEC_ID_AAC, MKTAG('V', 'L', 'B', ' ') },
210 { AV_CODEC_ID_SPEEX, MKTAG('S', 'P', 'X', ' ') },
211 { AV_CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') },
212 { AV_CODEC_ID_NONE, 0 },
213 };
214
215 //static int nsv_load_index(AVFormatContext *s);
216 static int nsv_read_chunk(AVFormatContext *s, int fill_header);
217
218 /* try to find something we recognize, and set the state accordingly */
219 95 static int nsv_resync(AVFormatContext *s)
220 {
221 95 NSVContext *nsv = s->priv_data;
222 95 AVIOContext *pb = s->pb;
223 95 uint32_t v = 0;
224 int i;
225
226
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202 for (i = 0; i < NSV_MAX_RESYNC; i++) {
227
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202 if (avio_feof(pb)) {
228 av_log(s, AV_LOG_TRACE, "NSV EOF\n");
229 nsv->state = NSV_UNSYNC;
230 return -1;
231 }
232 202 v <<= 8;
233 202 v |= avio_r8(pb);
234
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202 if (i < 8) {
235 202 av_log(s, AV_LOG_TRACE, "NSV resync: [%d] = %02"PRIx32"\n", i, v & 0x0FF);
236 }
237
238
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202 if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */
239 89 av_log(s, AV_LOG_TRACE, "NSV resynced on BEEF after %d bytes\n", i+1);
240 89 nsv->state = NSV_FOUND_BEEF;
241 89 return 0;
242 }
243 /* we read as big-endian, thus the MK*BE* */
244
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113 if (v == TB_NSVF) { /* NSVf */
245 1 av_log(s, AV_LOG_TRACE, "NSV resynced on NSVf after %d bytes\n", i+1);
246 1 nsv->state = NSV_FOUND_NSVF;
247 1 return 0;
248 }
249
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112 if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */
250 5 av_log(s, AV_LOG_TRACE, "NSV resynced on NSVs after %d bytes\n", i+1);
251 5 nsv->state = NSV_FOUND_NSVS;
252 5 return 0;
253 }
254
255 }
256 av_log(s, AV_LOG_TRACE, "NSV sync lost\n");
257 return -1;
258 }
259
260 1 static int nsv_parse_NSVf_header(AVFormatContext *s)
261 {
262 1 NSVContext *nsv = s->priv_data;
263 1 AVIOContext *pb = s->pb;
264 unsigned int av_unused file_size;
265 unsigned int size;
266 int64_t duration;
267 int strings_size;
268 int table_entries;
269 int table_entries_used;
270
271 1 nsv->state = NSV_UNSYNC; /* in case we fail */
272
273
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1 if (nsv->nsvf) {
274 av_log(s, AV_LOG_TRACE, "Multiple NSVf\n");
275 return 0;
276 }
277 1 nsv->nsvf = 1;
278
279 1 size = avio_rl32(pb);
280
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1 if (size < 28)
281 return -1;
282 1 nsv->NSVf_end = size;
283
284 1 file_size = (uint32_t)avio_rl32(pb);
285 1 av_log(s, AV_LOG_TRACE, "NSV NSVf chunk_size %u\n", size);
286 1 av_log(s, AV_LOG_TRACE, "NSV NSVf file_size %u\n", file_size);
287
288 1 nsv->duration = duration = avio_rl32(pb); /* in ms */
289 1 av_log(s, AV_LOG_TRACE, "NSV NSVf duration %"PRId64" ms\n", duration);
290 // XXX: store it in AVStreams
291
292 1 strings_size = avio_rl32(pb);
293 1 table_entries = avio_rl32(pb);
294 1 table_entries_used = avio_rl32(pb);
295 1 av_log(s, AV_LOG_TRACE, "NSV NSVf info-strings size: %d, table entries: %d, bis %d\n",
296 strings_size, table_entries, table_entries_used);
297
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1 if (avio_feof(pb))
298 return -1;
299
300 1 av_log(s, AV_LOG_TRACE, "NSV got header; filepos %"PRId64"\n", avio_tell(pb));
301
302
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1 if (strings_size > 0) {
303 char *strings; /* last byte will be '\0' to play safe with str*() */
304 char *p, *endp;
305 char *token, *value;
306 char quote;
307
308 1 p = strings = av_mallocz((size_t)strings_size + 1);
309
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1 if (!p)
310 return AVERROR(ENOMEM);
311 1 endp = strings + strings_size;
312 1 avio_read(pb, strings, strings_size);
313
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2 while (p < endp) {
314
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1 while (*p == ' ')
315 p++; /* strip out spaces */
316
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1 if (p >= endp-2)
317 break;
318 1 token = p;
319 1 p = strchr(p, '=');
320
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1 if (!p || p >= endp-2)
321 break;
322 1 *p++ = '\0';
323 1 quote = *p++;
324 1 value = p;
325 1 p = strchr(p, quote);
326
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1 if (!p || p >= endp)
327 break;
328 1 *p++ = '\0';
329 1 av_log(s, AV_LOG_TRACE, "NSV NSVf INFO: %s='%s'\n", token, value);
330 1 av_dict_set(&s->metadata, token, value, 0);
331 }
332 1 av_free(strings);
333 }
334
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1 if (avio_feof(pb))
335 return -1;
336
337 1 av_log(s, AV_LOG_TRACE, "NSV got infos; filepos %"PRId64"\n", avio_tell(pb));
338
339
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1 if (table_entries_used > 0) {
340 int i;
341 1 nsv->index_entries = table_entries_used;
342
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1 if((unsigned)table_entries_used >= UINT_MAX / sizeof(uint32_t))
343 return -1;
344 1 nsv->nsvs_file_offset = av_malloc_array((unsigned)table_entries_used, sizeof(uint32_t));
345
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1 if (!nsv->nsvs_file_offset)
346 return AVERROR(ENOMEM);
347
348
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101 for(i=0;i<table_entries_used;i++) {
349
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100 if (avio_feof(pb))
350 return AVERROR_INVALIDDATA;
351 100 nsv->nsvs_file_offset[i] = avio_rl32(pb) + size;
352 }
353
354
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1 if(table_entries > table_entries_used &&
355 avio_rl32(pb) == MKTAG('T','O','C','2')) {
356 nsv->nsvs_timestamps = av_malloc_array((unsigned)table_entries_used, sizeof(uint32_t));
357 if (!nsv->nsvs_timestamps)
358 return AVERROR(ENOMEM);
359 for(i=0;i<table_entries_used;i++) {
360 nsv->nsvs_timestamps[i] = avio_rl32(pb);
361 }
362 }
363 }
364
365 1 av_log(s, AV_LOG_TRACE, "NSV got index; filepos %"PRId64"\n", avio_tell(pb));
366
367 1 avio_seek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */
368
369
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1 if (avio_feof(pb))
370 return -1;
371 1 nsv->state = NSV_HAS_READ_NSVF;
372 1 return 0;
373 }
374
375 5 static int nsv_parse_NSVs_header(AVFormatContext *s)
376 {
377 5 NSVContext *nsv = s->priv_data;
378 5 AVIOContext *pb = s->pb;
379 uint32_t vtag, atag;
380 uint16_t vwidth, vheight;
381 AVRational framerate;
382 int i;
383 AVStream *st;
384 NSVStream *nst;
385
386 5 vtag = avio_rl32(pb);
387 5 atag = avio_rl32(pb);
388 5 vwidth = avio_rl16(pb);
389 5 vheight = avio_rl16(pb);
390 5 i = avio_r8(pb);
391
392 5 av_log(s, AV_LOG_TRACE, "NSV NSVs framerate code %2x\n", i);
393
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5 if(i&0x80) { /* odd way of giving native framerates from docs */
394 5 int t=(i & 0x7F)>>2;
395
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5 if(t<16) framerate = (AVRational){1, t+1};
396 else framerate = (AVRational){t-15, 1};
397
398
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5 if(i&1){
399 5 framerate.num *= 1000;
400 5 framerate.den *= 1001;
401 }
402
403
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5 if((i&3)==3) framerate.num *= 24;
404
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5 else if((i&3)==2) framerate.num *= 25;
405 5 else framerate.num *= 30;
406 }
407 else
408 framerate= (AVRational){i, 1};
409
410 5 nsv->avsync = avio_rl16(pb);
411 5 nsv->framerate = framerate;
412
413 5 av_log(s, AV_LOG_TRACE, "NSV NSVs vsize %dx%d\n", vwidth, vheight);
414
415 /* XXX change to ap != NULL ? */
416
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5 if (s->nb_streams == 0) { /* streams not yet published, let's do that */
417 1 nsv->vtag = vtag;
418 1 nsv->atag = atag;
419 1 nsv->vwidth = vwidth;
420 1 nsv->vheight = vwidth;
421
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1 if (vtag != T_NONE) {
422 int i;
423 1 st = avformat_new_stream(s, NULL);
424
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1 if (!st)
425 goto fail;
426
427 1 st->id = NSV_ST_VIDEO;
428 1 nst = av_mallocz(sizeof(NSVStream));
429
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1 if (!nst)
430 goto fail;
431 1 st->priv_data = nst;
432 1 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
433 1 st->codecpar->codec_tag = vtag;
434 1 st->codecpar->codec_id = ff_codec_get_id(nsv_codec_video_tags, vtag);
435 1 st->codecpar->width = vwidth;
436 1 st->codecpar->height = vheight;
437 1 st->codecpar->bits_per_coded_sample = 24; /* depth XXX */
438
439 1 avpriv_set_pts_info(st, 64, framerate.den, framerate.num);
440 1 st->start_time = 0;
441 1 st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den);
442
443
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101 for(i=0;i<nsv->index_entries;i++) {
444
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100 if(nsv->nsvs_timestamps) {
445 av_add_index_entry(st, nsv->nsvs_file_offset[i], nsv->nsvs_timestamps[i],
446 0, 0, AVINDEX_KEYFRAME);
447 } else {
448 100 int64_t ts = av_rescale(i*nsv->duration/nsv->index_entries, framerate.num, 1000*framerate.den);
449 100 av_add_index_entry(st, nsv->nsvs_file_offset[i], ts, 0, 0, AVINDEX_KEYFRAME);
450 }
451 }
452 }
453
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1 if (atag != T_NONE) {
454 1 st = avformat_new_stream(s, NULL);
455
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1 if (!st)
456 goto fail;
457
458 1 st->id = NSV_ST_AUDIO;
459 1 nst = av_mallocz(sizeof(NSVStream));
460
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1 if (!nst)
461 goto fail;
462 1 st->priv_data = nst;
463 1 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
464 1 st->codecpar->codec_tag = atag;
465 1 st->codecpar->codec_id = ff_codec_get_id(nsv_codec_audio_tags, atag);
466
467
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1 if (atag == MKTAG('A', 'A', 'V', ' ')) {
468 static const uint8_t aav_pce[] = {
469 0x12, 0x00, 0x05, 0x08, 0x48, 0x00,
470 0x20, 0x00, 0xC6, 0x40, 0x04, 0x4C,
471 0x61, 0x76, 0x63, 0x56, 0xE5, 0x00,
472 0x00, 0x00,
473 };
474 int ret;
475
476 if ((ret = ff_alloc_extradata(st->codecpar, sizeof(aav_pce))) < 0)
477 return ret;
478
479 st->codecpar->sample_rate = 44100;
480 memcpy(st->codecpar->extradata, aav_pce, sizeof(aav_pce));
481 }
482
483 1 ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL; /* for PCM we will read a chunk later and put correct info */
484
485 /* set timebase to common denominator of ms and framerate */
486 1 avpriv_set_pts_info(st, 64, 1, framerate.num*1000);
487 1 st->start_time = 0;
488 1 st->duration = (int64_t)nsv->duration * framerate.num;
489 }
490 } else {
491
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4 if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) {
492 av_log(s, AV_LOG_TRACE, "NSV NSVs header values differ from the first one!!!\n");
493 //return -1;
494 }
495 }
496
497 5 nsv->state = NSV_HAS_READ_NSVS;
498 5 return 0;
499 fail:
500 /* XXX */
501 nsv->state = NSV_UNSYNC;
502 return -1;
503 }
504
505 1 static int nsv_read_header(AVFormatContext *s)
506 {
507 1 NSVContext *nsv = s->priv_data;
508 int i, err;
509
510 1 nsv->state = NSV_UNSYNC;
511 1 nsv->ahead[0].data = nsv->ahead[1].data = NULL;
512
513
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2 for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
514 2 err = nsv_resync(s);
515
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2 if (err < 0)
516 return err;
517
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2 if (nsv->state == NSV_FOUND_NSVF) {
518 1 err = nsv_parse_NSVf_header(s);
519
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1 if (err < 0)
520 return err;
521 }
522 /* we need the first NSVs also... */
523
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2 if (nsv->state == NSV_FOUND_NSVS) {
524 1 err = nsv_parse_NSVs_header(s);
525
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1 if (err < 0)
526 return err;
527 1 break; /* we just want the first one */
528 }
529 }
530
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1 if (s->nb_streams < 1) /* no luck so far */
531 return AVERROR_INVALIDDATA;
532
533 /* now read the first chunk, so we can attempt to decode more info */
534 1 err = nsv_read_chunk(s, 1);
535
536 1 av_log(s, AV_LOG_TRACE, "parsed header\n");
537 1 return err;
538 }
539
540 94 static int nsv_read_chunk(AVFormatContext *s, int fill_header)
541 {
542 94 NSVContext *nsv = s->priv_data;
543 94 AVIOContext *pb = s->pb;
544 94 AVStream *st[2] = {NULL, NULL};
545 NSVStream *nst;
546 AVPacket *pkt;
547 94 int i, err = 0;
548 uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */
549 uint32_t vsize;
550 uint16_t asize;
551 uint16_t auxsize;
552 int ret;
553
554
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94 if (nsv->ahead[0].data || nsv->ahead[1].data)
555 return 0; //-1; /* hey! eat what you've in your plate first! */
556
557 94 null_chunk_retry:
558
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94 if (avio_feof(pb))
559 return -1;
560
561
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187 for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++)
562 93 err = nsv_resync(s);
563
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94 if (err < 0)
564 return err;
565
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94 if (nsv->state == NSV_FOUND_NSVS)
566 4 err = nsv_parse_NSVs_header(s);
567
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94 if (err < 0)
568 return err;
569
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94 if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF)
570 return -1;
571
572 94 auxcount = avio_r8(pb);
573 94 vsize = avio_rl16(pb);
574 94 asize = avio_rl16(pb);
575 94 vsize = (vsize << 4) | (auxcount >> 4);
576 94 auxcount &= 0x0f;
577 94 av_log(s, AV_LOG_TRACE, "NSV CHUNK %d aux, %"PRIu32" bytes video, %d bytes audio\n", auxcount, vsize, asize);
578 /* skip aux stuff */
579
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94 for (i = 0; i < auxcount; i++) {
580 uint32_t av_unused auxtag;
581 auxsize = avio_rl16(pb);
582 auxtag = avio_rl32(pb);
583 avio_skip(pb, auxsize);
584 vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming brain-dead */
585 }
586
587
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94 if (avio_feof(pb))
588 return -1;
589
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94 if (!vsize && !asize) {
590 nsv->state = NSV_UNSYNC;
591 goto null_chunk_retry;
592 }
593
594 /* map back streams to v,a */
595
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94 if (s->nb_streams > 0)
596 94 st[s->streams[0]->id] = s->streams[0];
597
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94 if (s->nb_streams > 1)
598 94 st[s->streams[1]->id] = s->streams[1];
599
600
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94 if (vsize && st[NSV_ST_VIDEO]) {
601 61 nst = st[NSV_ST_VIDEO]->priv_data;
602 61 pkt = &nsv->ahead[NSV_ST_VIDEO];
603
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61 if ((ret = av_get_packet(pb, pkt, vsize)) < 0)
604 return ret;
605 61 pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO;
606 61 pkt->dts = nst->frame_offset;
607 61 pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
608
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549 for (i = 0; i < FFMIN(8, vsize); i++)
609 488 av_log(s, AV_LOG_TRACE, "NSV video: [%d] = %02x\n", i, pkt->data[i]);
610 }
611
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94 if(st[NSV_ST_VIDEO])
612 94 ((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset++;
613
614
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94 if (asize && st[NSV_ST_AUDIO]) {
615 90 nst = st[NSV_ST_AUDIO]->priv_data;
616 90 pkt = &nsv->ahead[NSV_ST_AUDIO];
617 /* read raw audio specific header on the first audio chunk... */
618 /* on ALL audio chunks ?? seems so! */
619
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90 if (asize && st[NSV_ST_AUDIO]->codecpar->codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) {
620 uint8_t bps;
621 uint8_t channels;
622 uint16_t samplerate;
623 bps = avio_r8(pb);
624 channels = avio_r8(pb);
625 samplerate = avio_rl16(pb);
626 if (!channels || !samplerate)
627 return AVERROR_INVALIDDATA;
628 asize-=4;
629 av_log(s, AV_LOG_TRACE, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate);
630 if (fill_header) {
631 ffstream(st[NSV_ST_AUDIO])->need_parsing = AVSTREAM_PARSE_NONE; /* we know everything */
632 if (bps != 16) {
633 av_log(s, AV_LOG_TRACE, "NSV AUDIO bit/sample != 16 (%d)!!!\n", bps);
634 }
635 bps /= channels; // ???
636 if (bps == 8)
637 st[NSV_ST_AUDIO]->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
638 samplerate /= 4;/* UGH ??? XXX */
639 channels = 1;
640 st[NSV_ST_AUDIO]->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
641 st[NSV_ST_AUDIO]->codecpar->sample_rate = samplerate;
642 av_log(s, AV_LOG_TRACE, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate);
643 }
644 }
645
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90 if ((ret = av_get_packet(pb, pkt, asize)) < 0)
646 return ret;
647 90 pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO;
648 90 pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
649
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90 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 4 pkt->dts = (((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset-1);
652 4 pkt->dts *= (int64_t)1000 * nsv->framerate.den;
653 4 pkt->dts += (int64_t)nsv->avsync * nsv->framerate.num;
654 4 av_log(s, AV_LOG_TRACE, "NSV AUDIO: sync:%d, dts:%"PRId64, nsv->avsync, pkt->dts);
655 }
656 90 nst->frame_offset++;
657 }
658
659 94 nsv->state = NSV_UNSYNC;
660 94 return 0;
661 }
662
663
664 150 static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
665 {
666 150 NSVContext *nsv = s->priv_data;
667 150 int i, err = 0;
668
669 /* in case we don't already have something to eat ... */
670
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150 if (!nsv->ahead[0].data && !nsv->ahead[1].data)
671 93 err = nsv_read_chunk(s, 0);
672
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150 if (err < 0)
673 return err;
674
675 /* now pick one of the plates */
676
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239 for (i = 0; i < 2; i++) {
677
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239 if (nsv->ahead[i].data) {
678 150 av_packet_move_ref(pkt, &nsv->ahead[i]);
679 150 return 0;
680 }
681 }
682
683 /* this restaurant is not provisioned :^] */
684 return -1;
685 }
686
687 static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
688 {
689 NSVContext *nsv = s->priv_data;
690 AVStream *st = s->streams[stream_index];
691 FFStream *const sti = ffstream(st);
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, sti->index_entries[index].pos, SEEK_SET) < 0)
700 return -1;
701
702 nst->frame_offset = sti->index_entries[index].timestamp;
703 nsv->state = NSV_UNSYNC;
704 return 0;
705 }
706
707 1 static int nsv_read_close(AVFormatContext *s)
708 {
709 1 NSVContext *nsv = s->priv_data;
710
711 1 av_freep(&nsv->nsvs_file_offset);
712 1 av_freep(&nsv->nsvs_timestamps);
713
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1 if (nsv->ahead[0].data)
714 av_packet_unref(&nsv->ahead[0]);
715
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1 if (nsv->ahead[1].data)
716 1 av_packet_unref(&nsv->ahead[1]);
717 1 return 0;
718 }
719
720 7124 static int nsv_probe(const AVProbeData *p)
721 {
722 7124 int i, score = 0;
723
724 /* check file header */
725 /* streamed files might not have any header */
726
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7124 if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
727
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1 p->buf[2] == 'V' && (p->buf[3] == 'f' || p->buf[3] == 's'))
728 1 return AVPROBE_SCORE_MAX;
729 /* XXX: do streamed files always start at chunk boundary ?? */
730 /* or do we need to search NSVs in the byte stream ? */
731 /* seems the servers don't bother starting clean chunks... */
732 /* sometimes even the first header is at 9KB or something :^) */
733
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367553458 for (i = 1; i < p->buf_size - 3; i++) {
734
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367546335 if (AV_RL32(p->buf + i) == AV_RL32("NSVs")) {
735 /* Get the chunk size and check if at the end we are getting 0xBEEF */
736 int vsize = AV_RL24(p->buf+i+19) >> 4;
737 int asize = AV_RL16(p->buf+i+22);
738 int offset = i + 23 + asize + vsize + 1;
739 if (offset <= p->buf_size - 2 && AV_RL16(p->buf + offset) == 0xBEEF)
740 return 4*AVPROBE_SCORE_MAX/5;
741 score = AVPROBE_SCORE_MAX/5;
742 }
743 }
744 /* so we'll have more luck on extension... */
745
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7123 if (av_match_ext(p->filename, "nsv"))
746 return AVPROBE_SCORE_EXTENSION;
747 /* FIXME: add mime-type check */
748 7123 return score;
749 }
750
751 const FFInputFormat ff_nsv_demuxer = {
752 .p.name = "nsv",
753 .p.long_name = NULL_IF_CONFIG_SMALL("Nullsoft Streaming Video"),
754 .priv_data_size = sizeof(NSVContext),
755 .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
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 };
762