3 * Copyright (c) 2004 The FFmpeg Project
5 * first version by Francois Revol <revol@free.fr>
7 * This file is part of FFmpeg.
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.
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.
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
24 #include "libavutil/attributes.h"
25 #include "libavutil/mathematics.h"
28 #include "libavutil/dict.h"
29 #include "libavutil/intreadwrite.h"
31 /* max bytes to crawl for trying to resync
32 * stupid streaming servers don't start at chunk boundaries...
34 #define NSV_MAX_RESYNC (500*1024)
35 #define NSV_MAX_RESYNC_TRIES 300
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/
44 * (3) http://ultravox.aol.com/NSVFormat.rtf
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
52 * notes on the header (Francois Revol):
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.
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.
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.
69 * nsvtrailer.nsv (S1) does not have any NSVf header, only NSVs chunks,
70 * so the header seems to not be mandatory. (for streaming).
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
78 * - handle timestamps !!!
80 * - mime-type in probe()
86 uint32_t chunk_tag
; /* 'NSVf' */
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 */
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 */
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
;
111 struct nsv_pcm_header
{
112 uint8_t bits_per_sample
;
113 uint8_t channel_count
;
114 uint16_t sample_rate
;
118 /* variation from avi.h */
119 /*typedef struct CodecTag {
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) */
134 #define TB_NSVF MKBETAG('N', 'S', 'V', 'f')
135 #define TB_NSVS MKBETAG('N', 'S', 'V', 's')
137 /* hardcoded stream indexes */
138 #define NSV_ST_VIDEO 0
139 #define NSV_ST_AUDIO 1
140 #define NSV_ST_SUBT 2
153 typedef struct NSVStream
{
154 int frame_offset
; /* current frame (video) or byte (audio) counter
155 (used to compute the pts) */
158 int sample_size
; /* audio only data */
161 int new_frame_offset
; /* temporary storage (used during seek) */
162 int cum_len
; /* temporary storage (used during seek) */
168 uint32_t *nsvs_file_offset
;
170 enum NSVStatus state
;
171 AVPacket ahead
[2]; /* [v, a] if .data is !NULL there is something */
175 uint16_t vwidth
, vheight
;
177 AVRational framerate
;
178 uint32_t *nsvs_timestamps
;
179 //DVDemuxContext* dv_demux;
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') },
194 { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') },
195 { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') },
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 },
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 },
212 //static int nsv_load_index(AVFormatContext *s);
213 static int nsv_read_chunk(AVFormatContext
*s
, int fill_header
);
215 #define print_tag(str, tag, size) \
216 av_dlog(NULL, "%s: tag=%c%c%c%c\n", \
219 (tag >> 16) & 0xff, \
222 /* try to find something we recognize, and set the state accordingly */
223 static int nsv_resync(AVFormatContext
*s
)
225 NSVContext
*nsv
= s
->priv_data
;
226 AVIOContext
*pb
= s
->pb
;
230 av_dlog(s
, "%s(), offset = %"PRId64
", state = %d\n", __FUNCTION__
, avio_tell(pb
), nsv
->state
);
232 //nsv->state = NSV_UNSYNC;
234 for (i
= 0; i
< NSV_MAX_RESYNC
; i
++) {
236 av_dlog(s
, "NSV EOF\n");
237 nsv
->state
= NSV_UNSYNC
;
243 av_dlog(s
, "NSV resync: [%d] = %02x\n", i
, v
& 0x0FF);
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
;
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
;
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
;
264 av_dlog(s
, "NSV sync lost\n");
268 static int nsv_parse_NSVf_header(AVFormatContext
*s
)
270 NSVContext
*nsv
= s
->priv_data
;
271 AVIOContext
*pb
= s
->pb
;
272 unsigned int av_unused file_size
;
277 int table_entries_used
;
279 av_dlog(s
, "%s()\n", __FUNCTION__
);
281 nsv
->state
= NSV_UNSYNC
; /* in case we fail */
283 size
= avio_rl32(pb
);
286 nsv
->NSVf_end
= size
;
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
);
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
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
);
305 av_dlog(s
, "NSV got header; filepos %"PRId64
"\n", avio_tell(pb
));
307 if (strings_size
> 0) {
308 char *strings
; /* last byte will be '\0' to play safe with str*() */
313 p
= strings
= av_mallocz((size_t)strings_size
+ 1);
315 return AVERROR(ENOMEM
);
316 endp
= strings
+ strings_size
;
317 avio_read(pb
, strings
, strings_size
);
320 p
++; /* strip out spaces */
325 if (!p
|| p
>= endp
-2)
330 p
= strchr(p
, quote
);
334 av_dlog(s
, "NSV NSVf INFO: %s='%s'\n", token
, value
);
335 av_dict_set(&s
->metadata
, token
, value
, 0);
342 av_dlog(s
, "NSV got infos; filepos %"PRId64
"\n", avio_tell(pb
));
344 if (table_entries_used
> 0) {
346 nsv
->index_entries
= table_entries_used
;
347 if((unsigned)table_entries_used
>= UINT_MAX
/ sizeof(uint32_t))
349 nsv
->nsvs_file_offset
= av_malloc((unsigned)table_entries_used
* sizeof(uint32_t));
350 if (!nsv
->nsvs_file_offset
)
351 return AVERROR(ENOMEM
);
353 for(i
=0;i
<table_entries_used
;i
++)
354 nsv
->nsvs_file_offset
[i
] = avio_rl32(pb
) + size
;
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
);
367 av_dlog(s
, "NSV got index; filepos %"PRId64
"\n", avio_tell(pb
));
369 avio_seek(pb
, nsv
->base_offset
+ size
, SEEK_SET
); /* required for dumbdriving-271.nsv (2 extra bytes) */
373 nsv
->state
= NSV_HAS_READ_NSVF
;
377 static int nsv_parse_NSVs_header(AVFormatContext
*s
)
379 NSVContext
*nsv
= s
->priv_data
;
380 AVIOContext
*pb
= s
->pb
;
382 uint16_t vwidth
, vheight
;
383 AVRational framerate
;
387 av_dlog(s
, "%s()\n", __FUNCTION__
);
389 vtag
= avio_rl32(pb
);
390 atag
= avio_rl32(pb
);
391 vwidth
= avio_rl16(pb
);
392 vheight
= avio_rl16(pb
);
395 av_dlog(s
, "NSV NSVs framerate code %2x\n", i
);
396 if(i
&0x80) { /* odd way of giving native framerates from docs */
398 if(t
<16) framerate
= (AVRational
){1, t
+1};
399 else framerate
= (AVRational
){t
-15, 1};
402 framerate
.num
*= 1000;
403 framerate
.den
*= 1001;
406 if((i
&3)==3) framerate
.num
*= 24;
407 else if((i
&3)==2) framerate
.num
*= 25;
408 else framerate
.num
*= 30;
411 framerate
= (AVRational
){i
, 1};
413 nsv
->avsync
= avio_rl16(pb
);
414 nsv
->framerate
= framerate
;
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
);
420 /* XXX change to ap != NULL ? */
421 if (s
->nb_streams
== 0) { /* streams not yet published, let's do that */
424 nsv
->vwidth
= vwidth
;
425 nsv
->vheight
= vwidth
;
426 if (vtag
!= T_NONE
) {
428 st
= avformat_new_stream(s
, NULL
);
432 st
->id
= NSV_ST_VIDEO
;
433 nst
= av_mallocz(sizeof(NSVStream
));
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 */
444 avpriv_set_pts_info(st
, 64, framerate
.den
, framerate
.num
);
446 st
->duration
= av_rescale(nsv
->duration
, framerate
.num
, 1000*framerate
.den
);
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
);
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
);
458 if (atag
!= T_NONE
) {
459 st
= avformat_new_stream(s
, NULL
);
463 st
->id
= NSV_ST_AUDIO
;
464 nst
= av_mallocz(sizeof(NSVStream
));
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
);
472 st
->need_parsing
= AVSTREAM_PARSE_FULL
; /* for PCM we will read a chunk later and put correct info */
474 /* set timebase to common denominator of ms and framerate */
475 avpriv_set_pts_info(st
, 64, 1, framerate
.num
*1000);
477 st
->duration
= (int64_t)nsv
->duration
* framerate
.num
;
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");
486 nsv
->state
= NSV_HAS_READ_NSVS
;
490 nsv
->state
= NSV_UNSYNC
;
494 static int nsv_read_header(AVFormatContext
*s
)
496 NSVContext
*nsv
= s
->priv_data
;
499 av_dlog(s
, "%s()\n", __FUNCTION__
);
500 av_dlog(s
, "filename '%s'\n", s
->filename
);
502 nsv
->state
= NSV_UNSYNC
;
503 nsv
->ahead
[0].data
= nsv
->ahead
[1].data
= NULL
;
505 for (i
= 0; i
< NSV_MAX_RESYNC_TRIES
; i
++) {
506 if (nsv_resync(s
) < 0)
508 if (nsv
->state
== NSV_FOUND_NSVF
) {
509 err
= nsv_parse_NSVf_header(s
);
513 /* we need the first NSVs also... */
514 if (nsv
->state
== NSV_FOUND_NSVS
) {
515 err
= nsv_parse_NSVs_header(s
);
518 break; /* we just want the first one */
521 if (s
->nb_streams
< 1) /* no luck so far */
523 /* now read the first chunk, so we can attempt to decode more info */
524 err
= nsv_read_chunk(s
, 1);
526 av_dlog(s
, "parsed header\n");
530 static int nsv_read_chunk(AVFormatContext
*s
, int fill_header
)
532 NSVContext
*nsv
= s
->priv_data
;
533 AVIOContext
*pb
= s
->pb
;
534 AVStream
*st
[2] = {NULL
, NULL
};
538 uint8_t auxcount
; /* number of aux metadata, also 4 bits of vsize */
543 av_dlog(s
, "%s(%d)\n", __FUNCTION__
, fill_header
);
545 if (nsv
->ahead
[0].data
|| nsv
->ahead
[1].data
)
546 return 0; //-1; /* hey! eat what you've in your plate first! */
552 for (i
= 0; i
< NSV_MAX_RESYNC_TRIES
&& nsv
->state
< NSV_FOUND_NSVS
&& !err
; i
++)
556 if (nsv
->state
== NSV_FOUND_NSVS
)
557 err
= nsv_parse_NSVs_header(s
);
560 if (nsv
->state
!= NSV_HAS_READ_NSVS
&& nsv
->state
!= NSV_FOUND_BEEF
)
563 auxcount
= avio_r8(pb
);
564 vsize
= avio_rl16(pb
);
565 asize
= avio_rl16(pb
);
566 vsize
= (vsize
<< 4) | (auxcount
>> 4);
568 av_dlog(s
, "NSV CHUNK %d aux, %u bytes video, %d bytes audio\n", auxcount
, vsize
, asize
);
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",
576 ((auxtag
>> 8) & 0x0ff),
577 ((auxtag
>> 16) & 0x0ff),
578 ((auxtag
>> 24) & 0x0ff),
580 avio_skip(pb
, auxsize
);
581 vsize
-= auxsize
+ sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming braindead */
586 if (!vsize
&& !asize
) {
587 nsv
->state
= NSV_UNSYNC
;
588 goto null_chunk_retry
;
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];
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
]);
608 ((NSVStream
*)st
[NSV_ST_VIDEO
]->priv_data
)->frame_offset
++;
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*/) {
620 channels
= avio_r8(pb
);
621 samplerate
= avio_rl16(pb
);
623 av_dlog(s
, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps
, channels
, samplerate
);
625 st
[NSV_ST_AUDIO
]->need_parsing
= AVSTREAM_PARSE_NONE
; /* we know everything */
627 av_dlog(s
, "NSV AUDIO bit/sample != 16 (%d)!!!\n", bps
);
630 bps
/= channels
; // ???
632 av_log(s
, AV_LOG_WARNING
, "Channels is 0\n");
634 st
[NSV_ST_AUDIO
]->codec
->codec_id
= AV_CODEC_ID_PCM_U8
;
635 samplerate
/= 4;/* UGH ??? XXX */
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
);
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
);
655 nsv
->state
= NSV_UNSYNC
;
660 static int nsv_read_packet(AVFormatContext
*s
, AVPacket
*pkt
)
662 NSVContext
*nsv
= s
->priv_data
;
665 av_dlog(s
, "%s()\n", __FUNCTION__
);
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);
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 */
684 /* this restaurant is not approvisionned :^] */
688 static int nsv_read_seek(AVFormatContext
*s
, int stream_index
, int64_t timestamp
, int flags
)
690 NSVContext
*nsv
= s
->priv_data
;
691 AVStream
*st
= s
->streams
[stream_index
];
692 NSVStream
*nst
= st
->priv_data
;
695 index
= av_index_search_timestamp(st
, timestamp
, flags
);
699 if (avio_seek(s
->pb
, st
->index_entries
[index
].pos
, SEEK_SET
) < 0)
702 nst
->frame_offset
= st
->index_entries
[index
].timestamp
;
703 nsv
->state
= NSV_UNSYNC
;
707 static int nsv_read_close(AVFormatContext
*s
)
709 NSVContext
*nsv
= s
->priv_data
;
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]);
720 static int nsv_probe(AVProbeData
*p
)
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;
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 */
752 AVInputFormat ff_nsv_demuxer
= {
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
,