FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/nsvdec.c
Date: 2024-02-29 09:57:37
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 "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 viewing 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 nsvtrailer (which doesn't have an NSVf header), it reports 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 NSVContext {
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 int nsvf;
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_H264, MKTAG('H', '2', '6', '4') },
199 { AV_CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') },
200 { AV_CODEC_ID_NONE, 0 },
201 };
202
203 static const AVCodecTag nsv_codec_audio_tags[] = {
204 { AV_CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') },
205 { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'C', ' ') },
206 { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'C', 'P') },
207 { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'V', ' ') },
208 { AV_CODEC_ID_AAC, MKTAG('V', 'L', 'B', ' ') },
209 { AV_CODEC_ID_SPEEX, MKTAG('S', 'P', 'X', ' ') },
210 { AV_CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') },
211 { AV_CODEC_ID_NONE, 0 },
212 };
213
214 //static int nsv_load_index(AVFormatContext *s);
215 static int nsv_read_chunk(AVFormatContext *s, int fill_header);
216
217 /* try to find something we recognize, and set the state accordingly */
218 93 static int nsv_resync(AVFormatContext *s)
219 {
220 93 NSVContext *nsv = s->priv_data;
221 93 AVIOContext *pb = s->pb;
222 93 uint32_t v = 0;
223 int i;
224
225
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198 for (i = 0; i < NSV_MAX_RESYNC; i++) {
226
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198 if (avio_feof(pb)) {
227 av_log(s, AV_LOG_TRACE, "NSV EOF\n");
228 nsv->state = NSV_UNSYNC;
229 return -1;
230 }
231 198 v <<= 8;
232 198 v |= avio_r8(pb);
233
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198 if (i < 8) {
234 198 av_log(s, AV_LOG_TRACE, "NSV resync: [%d] = %02"PRIx32"\n", i, v & 0x0FF);
235 }
236
237
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198 if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */
238 87 av_log(s, AV_LOG_TRACE, "NSV resynced on BEEF after %d bytes\n", i+1);
239 87 nsv->state = NSV_FOUND_BEEF;
240 87 return 0;
241 }
242 /* we read as big-endian, thus the MK*BE* */
243
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111 if (v == TB_NSVF) { /* NSVf */
244 1 av_log(s, AV_LOG_TRACE, "NSV resynced on NSVf after %d bytes\n", i+1);
245 1 nsv->state = NSV_FOUND_NSVF;
246 1 return 0;
247 }
248
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110 if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */
249 5 av_log(s, AV_LOG_TRACE, "NSV resynced on NSVs after %d bytes\n", i+1);
250 5 nsv->state = NSV_FOUND_NSVS;
251 5 return 0;
252 }
253
254 }
255 av_log(s, AV_LOG_TRACE, "NSV sync lost\n");
256 return -1;
257 }
258
259 1 static int nsv_parse_NSVf_header(AVFormatContext *s)
260 {
261 1 NSVContext *nsv = s->priv_data;
262 1 AVIOContext *pb = s->pb;
263 unsigned int av_unused file_size;
264 unsigned int size;
265 int64_t duration;
266 int strings_size;
267 int table_entries;
268 int table_entries_used;
269
270 1 nsv->state = NSV_UNSYNC; /* in case we fail */
271
272
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1 if (nsv->nsvf) {
273 av_log(s, AV_LOG_TRACE, "Multiple NSVf\n");
274 return 0;
275 }
276 1 nsv->nsvf = 1;
277
278 1 size = avio_rl32(pb);
279
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1 if (size < 28)
280 return -1;
281 1 nsv->NSVf_end = size;
282
283 1 file_size = (uint32_t)avio_rl32(pb);
284 1 av_log(s, AV_LOG_TRACE, "NSV NSVf chunk_size %u\n", size);
285 1 av_log(s, AV_LOG_TRACE, "NSV NSVf file_size %u\n", file_size);
286
287 1 nsv->duration = duration = avio_rl32(pb); /* in ms */
288 1 av_log(s, AV_LOG_TRACE, "NSV NSVf duration %"PRId64" ms\n", duration);
289 // XXX: store it in AVStreams
290
291 1 strings_size = avio_rl32(pb);
292 1 table_entries = avio_rl32(pb);
293 1 table_entries_used = avio_rl32(pb);
294 1 av_log(s, AV_LOG_TRACE, "NSV NSVf info-strings size: %d, table entries: %d, bis %d\n",
295 strings_size, table_entries, table_entries_used);
296
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1 if (avio_feof(pb))
297 return -1;
298
299 1 av_log(s, AV_LOG_TRACE, "NSV got header; filepos %"PRId64"\n", avio_tell(pb));
300
301
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1 if (strings_size > 0) {
302 char *strings; /* last byte will be '\0' to play safe with str*() */
303 char *p, *endp;
304 char *token, *value;
305 char quote;
306
307 1 p = strings = av_mallocz((size_t)strings_size + 1);
308
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1 if (!p)
309 return AVERROR(ENOMEM);
310 1 endp = strings + strings_size;
311 1 avio_read(pb, strings, strings_size);
312
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2 while (p < endp) {
313
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1 while (*p == ' ')
314 p++; /* strip out spaces */
315
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1 if (p >= endp-2)
316 break;
317 1 token = p;
318 1 p = strchr(p, '=');
319
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1 if (!p || p >= endp-2)
320 break;
321 1 *p++ = '\0';
322 1 quote = *p++;
323 1 value = p;
324 1 p = strchr(p, quote);
325
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1 if (!p || p >= endp)
326 break;
327 1 *p++ = '\0';
328 1 av_log(s, AV_LOG_TRACE, "NSV NSVf INFO: %s='%s'\n", token, value);
329 1 av_dict_set(&s->metadata, token, value, 0);
330 }
331 1 av_free(strings);
332 }
333
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1 if (avio_feof(pb))
334 return -1;
335
336 1 av_log(s, AV_LOG_TRACE, "NSV got infos; filepos %"PRId64"\n", avio_tell(pb));
337
338
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1 if (table_entries_used > 0) {
339 int i;
340 1 nsv->index_entries = table_entries_used;
341
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1 if((unsigned)table_entries_used >= UINT_MAX / sizeof(uint32_t))
342 return -1;
343 1 nsv->nsvs_file_offset = av_malloc_array((unsigned)table_entries_used, sizeof(uint32_t));
344
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1 if (!nsv->nsvs_file_offset)
345 return AVERROR(ENOMEM);
346
347
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101 for(i=0;i<table_entries_used;i++) {
348
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100 if (avio_feof(pb))
349 return AVERROR_INVALIDDATA;
350 100 nsv->nsvs_file_offset[i] = avio_rl32(pb) + size;
351 }
352
353
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1 if(table_entries > table_entries_used &&
354 avio_rl32(pb) == MKTAG('T','O','C','2')) {
355 nsv->nsvs_timestamps = av_malloc_array((unsigned)table_entries_used, sizeof(uint32_t));
356 if (!nsv->nsvs_timestamps)
357 return AVERROR(ENOMEM);
358 for(i=0;i<table_entries_used;i++) {
359 nsv->nsvs_timestamps[i] = avio_rl32(pb);
360 }
361 }
362 }
363
364 1 av_log(s, AV_LOG_TRACE, "NSV got index; filepos %"PRId64"\n", avio_tell(pb));
365
366 1 avio_seek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */
367
368
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1 if (avio_feof(pb))
369 return -1;
370 1 nsv->state = NSV_HAS_READ_NSVF;
371 1 return 0;
372 }
373
374 5 static int nsv_parse_NSVs_header(AVFormatContext *s)
375 {
376 5 NSVContext *nsv = s->priv_data;
377 5 AVIOContext *pb = s->pb;
378 uint32_t vtag, atag;
379 uint16_t vwidth, vheight;
380 AVRational framerate;
381 int i;
382 AVStream *st;
383 NSVStream *nst;
384
385 5 vtag = avio_rl32(pb);
386 5 atag = avio_rl32(pb);
387 5 vwidth = avio_rl16(pb);
388 5 vheight = avio_rl16(pb);
389 5 i = avio_r8(pb);
390
391 5 av_log(s, AV_LOG_TRACE, "NSV NSVs framerate code %2x\n", i);
392
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5 if(i&0x80) { /* odd way of giving native framerates from docs */
393 5 int t=(i & 0x7F)>>2;
394
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5 if(t<16) framerate = (AVRational){1, t+1};
395 else framerate = (AVRational){t-15, 1};
396
397
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5 if(i&1){
398 5 framerate.num *= 1000;
399 5 framerate.den *= 1001;
400 }
401
402
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5 if((i&3)==3) framerate.num *= 24;
403
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5 else if((i&3)==2) framerate.num *= 25;
404 5 else framerate.num *= 30;
405 }
406 else
407 framerate= (AVRational){i, 1};
408
409 5 nsv->avsync = avio_rl16(pb);
410 5 nsv->framerate = framerate;
411
412 5 av_log(s, AV_LOG_TRACE, "NSV NSVs vsize %dx%d\n", vwidth, vheight);
413
414 /* XXX change to ap != NULL ? */
415
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5 if (s->nb_streams == 0) { /* streams not yet published, let's do that */
416 1 nsv->vtag = vtag;
417 1 nsv->atag = atag;
418 1 nsv->vwidth = vwidth;
419 1 nsv->vheight = vwidth;
420
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1 if (vtag != T_NONE) {
421 int i;
422 1 st = avformat_new_stream(s, NULL);
423
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1 if (!st)
424 goto fail;
425
426 1 st->id = NSV_ST_VIDEO;
427 1 nst = av_mallocz(sizeof(NSVStream));
428
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1 if (!nst)
429 goto fail;
430 1 st->priv_data = nst;
431 1 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
432 1 st->codecpar->codec_tag = vtag;
433 1 st->codecpar->codec_id = ff_codec_get_id(nsv_codec_video_tags, vtag);
434 1 st->codecpar->width = vwidth;
435 1 st->codecpar->height = vheight;
436 1 st->codecpar->bits_per_coded_sample = 24; /* depth XXX */
437
438 1 avpriv_set_pts_info(st, 64, framerate.den, framerate.num);
439 1 st->start_time = 0;
440 1 st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den);
441
442
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101 for(i=0;i<nsv->index_entries;i++) {
443
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100 if(nsv->nsvs_timestamps) {
444 av_add_index_entry(st, nsv->nsvs_file_offset[i], nsv->nsvs_timestamps[i],
445 0, 0, AVINDEX_KEYFRAME);
446 } else {
447 100 int64_t ts = av_rescale(i*nsv->duration/nsv->index_entries, framerate.num, 1000*framerate.den);
448 100 av_add_index_entry(st, nsv->nsvs_file_offset[i], ts, 0, 0, AVINDEX_KEYFRAME);
449 }
450 }
451 }
452
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1 if (atag != T_NONE) {
453 1 st = avformat_new_stream(s, NULL);
454
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1 if (!st)
455 goto fail;
456
457 1 st->id = NSV_ST_AUDIO;
458 1 nst = av_mallocz(sizeof(NSVStream));
459
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1 if (!nst)
460 goto fail;
461 1 st->priv_data = nst;
462 1 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
463 1 st->codecpar->codec_tag = atag;
464 1 st->codecpar->codec_id = ff_codec_get_id(nsv_codec_audio_tags, atag);
465
466
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1 if (atag == MKTAG('A', 'A', 'V', ' ')) {
467 static const uint8_t aav_pce[] = {
468 0x12, 0x00, 0x05, 0x08, 0x48, 0x00,
469 0x20, 0x00, 0xC6, 0x40, 0x04, 0x4C,
470 0x61, 0x76, 0x63, 0x56, 0xE5, 0x00,
471 0x00, 0x00,
472 };
473 int ret;
474
475 if ((ret = ff_alloc_extradata(st->codecpar, sizeof(aav_pce))) < 0)
476 return ret;
477
478 st->codecpar->sample_rate = 44100;
479 memcpy(st->codecpar->extradata, aav_pce, sizeof(aav_pce));
480 }
481
482 1 ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL; /* for PCM we will read a chunk later and put correct info */
483
484 /* set timebase to common denominator of ms and framerate */
485 1 avpriv_set_pts_info(st, 64, 1, framerate.num*1000);
486 1 st->start_time = 0;
487 1 st->duration = (int64_t)nsv->duration * framerate.num;
488 }
489 } else {
490
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4 if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) {
491 av_log(s, AV_LOG_TRACE, "NSV NSVs header values differ from the first one!!!\n");
492 //return -1;
493 }
494 }
495
496 5 nsv->state = NSV_HAS_READ_NSVS;
497 5 return 0;
498 fail:
499 /* XXX */
500 nsv->state = NSV_UNSYNC;
501 return -1;
502 }
503
504 1 static int nsv_read_header(AVFormatContext *s)
505 {
506 1 NSVContext *nsv = s->priv_data;
507 int i, err;
508
509 1 nsv->state = NSV_UNSYNC;
510 1 nsv->ahead[0].data = nsv->ahead[1].data = NULL;
511
512
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2 for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
513 2 err = nsv_resync(s);
514
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2 if (err < 0)
515 return err;
516
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2 if (nsv->state == NSV_FOUND_NSVF) {
517 1 err = nsv_parse_NSVf_header(s);
518
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1 if (err < 0)
519 return err;
520 }
521 /* we need the first NSVs also... */
522
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2 if (nsv->state == NSV_FOUND_NSVS) {
523 1 err = nsv_parse_NSVs_header(s);
524
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1 if (err < 0)
525 return err;
526 1 break; /* we just want the first one */
527 }
528 }
529
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1 if (s->nb_streams < 1) /* no luck so far */
530 return AVERROR_INVALIDDATA;
531
532 /* now read the first chunk, so we can attempt to decode more info */
533 1 err = nsv_read_chunk(s, 1);
534
535 1 av_log(s, AV_LOG_TRACE, "parsed header\n");
536 1 return err;
537 }
538
539 92 static int nsv_read_chunk(AVFormatContext *s, int fill_header)
540 {
541 92 NSVContext *nsv = s->priv_data;
542 92 AVIOContext *pb = s->pb;
543 92 AVStream *st[2] = {NULL, NULL};
544 NSVStream *nst;
545 AVPacket *pkt;
546 92 int i, err = 0;
547 uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */
548 uint32_t vsize;
549 uint16_t asize;
550 uint16_t auxsize;
551 int ret;
552
553
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92 if (nsv->ahead[0].data || nsv->ahead[1].data)
554 return 0; //-1; /* hey! eat what you've in your plate first! */
555
556 92 null_chunk_retry:
557
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92 if (avio_feof(pb))
558 return -1;
559
560
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183 for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++)
561 91 err = nsv_resync(s);
562
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92 if (err < 0)
563 return err;
564
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92 if (nsv->state == NSV_FOUND_NSVS)
565 4 err = nsv_parse_NSVs_header(s);
566
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92 if (err < 0)
567 return err;
568
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92 if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF)
569 return -1;
570
571 92 auxcount = avio_r8(pb);
572 92 vsize = avio_rl16(pb);
573 92 asize = avio_rl16(pb);
574 92 vsize = (vsize << 4) | (auxcount >> 4);
575 92 auxcount &= 0x0f;
576 92 av_log(s, AV_LOG_TRACE, "NSV CHUNK %d aux, %"PRIu32" bytes video, %d bytes audio\n", auxcount, vsize, asize);
577 /* skip aux stuff */
578
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92 for (i = 0; i < auxcount; i++) {
579 uint32_t av_unused auxtag;
580 auxsize = avio_rl16(pb);
581 auxtag = avio_rl32(pb);
582 avio_skip(pb, auxsize);
583 vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming brain-dead */
584 }
585
586
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92 if (avio_feof(pb))
587 return -1;
588
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92 if (!vsize && !asize) {
589 nsv->state = NSV_UNSYNC;
590 goto null_chunk_retry;
591 }
592
593 /* map back streams to v,a */
594
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92 if (s->nb_streams > 0)
595 92 st[s->streams[0]->id] = s->streams[0];
596
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92 if (s->nb_streams > 1)
597 92 st[s->streams[1]->id] = s->streams[1];
598
599
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92 if (vsize && st[NSV_ST_VIDEO]) {
600 60 nst = st[NSV_ST_VIDEO]->priv_data;
601 60 pkt = &nsv->ahead[NSV_ST_VIDEO];
602
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60 if ((ret = av_get_packet(pb, pkt, vsize)) < 0)
603 return ret;
604 60 pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO;
605 60 pkt->dts = nst->frame_offset;
606 60 pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
607
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540 for (i = 0; i < FFMIN(8, vsize); i++)
608 480 av_log(s, AV_LOG_TRACE, "NSV video: [%d] = %02x\n", i, pkt->data[i]);
609 }
610
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92 if(st[NSV_ST_VIDEO])
611 92 ((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset++;
612
613
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92 if (asize && st[NSV_ST_AUDIO]) {
614 88 nst = st[NSV_ST_AUDIO]->priv_data;
615 88 pkt = &nsv->ahead[NSV_ST_AUDIO];
616 /* read raw audio specific header on the first audio chunk... */
617 /* on ALL audio chunks ?? seems so! */
618
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88 if (asize && st[NSV_ST_AUDIO]->codecpar->codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) {
619 uint8_t bps;
620 uint8_t channels;
621 uint16_t samplerate;
622 bps = avio_r8(pb);
623 channels = avio_r8(pb);
624 samplerate = avio_rl16(pb);
625 if (!channels || !samplerate)
626 return AVERROR_INVALIDDATA;
627 asize-=4;
628 av_log(s, AV_LOG_TRACE, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate);
629 if (fill_header) {
630 ffstream(st[NSV_ST_AUDIO])->need_parsing = AVSTREAM_PARSE_NONE; /* we know everything */
631 if (bps != 16) {
632 av_log(s, AV_LOG_TRACE, "NSV AUDIO bit/sample != 16 (%d)!!!\n", bps);
633 }
634 bps /= channels; // ???
635 if (bps == 8)
636 st[NSV_ST_AUDIO]->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
637 samplerate /= 4;/* UGH ??? XXX */
638 channels = 1;
639 st[NSV_ST_AUDIO]->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
640 st[NSV_ST_AUDIO]->codecpar->sample_rate = samplerate;
641 av_log(s, AV_LOG_TRACE, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate);
642 }
643 }
644
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88 if ((ret = av_get_packet(pb, pkt, asize)) < 0)
645 return ret;
646 88 pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO;
647 88 pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
648
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88 if( nsv->state == NSV_HAS_READ_NSVS && st[NSV_ST_VIDEO] ) {
649 /* on a nsvs frame we have new information on a/v sync */
650 4 pkt->dts = (((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset-1);
651 4 pkt->dts *= (int64_t)1000 * nsv->framerate.den;
652 4 pkt->dts += (int64_t)nsv->avsync * nsv->framerate.num;
653 4 av_log(s, AV_LOG_TRACE, "NSV AUDIO: sync:%d, dts:%"PRId64, nsv->avsync, pkt->dts);
654 }
655 88 nst->frame_offset++;
656 }
657
658 92 nsv->state = NSV_UNSYNC;
659 92 return 0;
660 }
661
662
663 148 static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
664 {
665 148 NSVContext *nsv = s->priv_data;
666 148 int i, err = 0;
667
668 /* in case we don't already have something to eat ... */
669
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148 if (!nsv->ahead[0].data && !nsv->ahead[1].data)
670 91 err = nsv_read_chunk(s, 0);
671
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148 if (err < 0)
672 return err;
673
674 /* now pick one of the plates */
675
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236 for (i = 0; i < 2; i++) {
676
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236 if (nsv->ahead[i].data) {
677 148 av_packet_move_ref(pkt, &nsv->ahead[i]);
678 148 return 0;
679 }
680 }
681
682 /* this restaurant is not provisioned :^] */
683 return -1;
684 }
685
686 static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
687 {
688 NSVContext *nsv = s->priv_data;
689 AVStream *st = s->streams[stream_index];
690 FFStream *const sti = ffstream(st);
691 NSVStream *nst = st->priv_data;
692 int index;
693
694 index = av_index_search_timestamp(st, timestamp, flags);
695 if(index < 0)
696 return -1;
697
698 if (avio_seek(s->pb, sti->index_entries[index].pos, SEEK_SET) < 0)
699 return -1;
700
701 nst->frame_offset = sti->index_entries[index].timestamp;
702 nsv->state = NSV_UNSYNC;
703 return 0;
704 }
705
706 1 static int nsv_read_close(AVFormatContext *s)
707 {
708 1 NSVContext *nsv = s->priv_data;
709
710 1 av_freep(&nsv->nsvs_file_offset);
711 1 av_freep(&nsv->nsvs_timestamps);
712
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1 if (nsv->ahead[0].data)
713 av_packet_unref(&nsv->ahead[0]);
714
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1 if (nsv->ahead[1].data)
715 av_packet_unref(&nsv->ahead[1]);
716 1 return 0;
717 }
718
719 7056 static int nsv_probe(const AVProbeData *p)
720 {
721 7056 int i, score = 0;
722
723 /* check file header */
724 /* streamed files might not have any header */
725
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7056 if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
726
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1 p->buf[2] == 'V' && (p->buf[3] == 'f' || p->buf[3] == 's'))
727 1 return AVPROBE_SCORE_MAX;
728 /* XXX: do streamed files always start at chunk boundary ?? */
729 /* or do we need to search NSVs in the byte stream ? */
730 /* seems the servers don't bother starting clean chunks... */
731 /* sometimes even the first header is at 9KB or something :^) */
732
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142870066 for (i = 1; i < p->buf_size - 3; i++) {
733
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142863011 if (AV_RL32(p->buf + i) == AV_RL32("NSVs")) {
734 /* Get the chunk size and check if at the end we are getting 0xBEEF */
735 int vsize = AV_RL24(p->buf+i+19) >> 4;
736 int asize = AV_RL16(p->buf+i+22);
737 int offset = i + 23 + asize + vsize + 1;
738 if (offset <= p->buf_size - 2 && AV_RL16(p->buf + offset) == 0xBEEF)
739 return 4*AVPROBE_SCORE_MAX/5;
740 score = AVPROBE_SCORE_MAX/5;
741 }
742 }
743 /* so we'll have more luck on extension... */
744
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7055 if (av_match_ext(p->filename, "nsv"))
745 return AVPROBE_SCORE_EXTENSION;
746 /* FIXME: add mime-type check */
747 7055 return score;
748 }
749
750 const AVInputFormat ff_nsv_demuxer = {
751 .name = "nsv",
752 .long_name = NULL_IF_CONFIG_SMALL("Nullsoft Streaming Video"),
753 .priv_data_size = sizeof(NSVContext),
754 .flags_internal = FF_FMT_INIT_CLEANUP,
755 .read_probe = nsv_probe,
756 .read_header = nsv_read_header,
757 .read_packet = nsv_read_packet,
758 .read_close = nsv_read_close,
759 .read_seek = nsv_read_seek,
760 };
761