3 * Copyright (c) 2004 The FFmpeg Project
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 //#define DEBUG_DUMP_INDEX // XXX dumbdriving-271.nsv breaks with it commented!!
27 #define CHECK_SUBSEQUENT_NSVS
28 //#define DISABLE_AUDIO
30 /* max bytes to crawl for trying to resync
31 * stupid streaming servers don't start at chunk boundaries...
33 #define NSV_MAX_RESYNC (500*1024)
34 #define NSV_MAX_RESYNC_TRIES 300
37 * First version by Francois Revol - revol@free.fr
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()
85 #define PRINT(_v) printf _v
92 uint32_t chunk_tag
; /* 'NSVf' */
94 uint32_t file_size
; /* max 4GB ??? no one learns anything it seems :^) */
95 uint32_t file_length
; //unknown1; /* what about MSB of file_size ? */
96 uint32_t info_strings_size
; /* size of the info strings */ //unknown2;
97 uint32_t table_entries
;
98 uint32_t table_entries_used
; /* the left ones should be -1 */
102 uint32_t chunk_tag
; /* 'NSVs' */
103 uint32_t v4cc
; /* or 'NONE' */
104 uint32_t a4cc
; /* or 'NONE' */
105 uint16_t vwidth
; /* assert(vwidth%16==0) */
106 uint16_t vheight
; /* assert(vheight%16==0) */
107 uint8_t framerate
; /* value = (framerate&0x80)?frtable[frameratex0x7f]:framerate */
111 struct nsv_avchunk_header
{
112 uint8_t vchunk_size_lsb
;
113 uint16_t vchunk_size_msb
; /* value = (vchunk_size_msb << 4) | (vchunk_size_lsb >> 4) */
114 uint16_t achunk_size
;
117 struct nsv_pcm_header
{
118 uint8_t bits_per_sample
;
119 uint8_t channel_count
;
120 uint16_t sample_rate
;
124 /* variation from avi.h */
125 /*typedef struct CodecTag {
132 #define T_NSVF MKTAG('N', 'S', 'V', 'f') /* file header */
133 #define T_NSVS MKTAG('N', 'S', 'V', 's') /* chunk header */
134 #define T_TOC2 MKTAG('T', 'O', 'C', '2') /* extra index marker */
135 #define T_NONE MKTAG('N', 'O', 'N', 'E') /* null a/v 4CC */
136 #define T_SUBT MKTAG('S', 'U', 'B', 'T') /* subtitle aux data */
137 #define T_ASYN MKTAG('A', 'S', 'Y', 'N') /* async a/v aux marker */
138 #define T_KEYF MKTAG('K', 'E', 'Y', 'F') /* video keyframe aux marker (addition) */
140 #define TB_NSVF MKBETAG('N', 'S', 'V', 'f')
141 #define TB_NSVS MKBETAG('N', 'S', 'V', 's')
143 /* hardcoded stream indexes */
144 #define NSV_ST_VIDEO 0
145 #define NSV_ST_AUDIO 1
146 #define NSV_ST_SUBT 2
159 typedef struct NSVStream
{
160 int frame_offset
; /* current frame (video) or byte (audio) counter
161 (used to compute the pts) */
164 int sample_size
; /* audio only data */
167 int new_frame_offset
; /* temporary storage (used during seek) */
168 int cum_len
; /* temporary storage (used during seek) */
174 uint32_t *nsvf_index_data
;
176 enum NSVStatus state
;
177 AVPacket ahead
[2]; /* [v, a] if .data is !NULL there is something */
181 uint16_t vwidth
, vheight
;
183 AVRational framerate
;
184 //DVDemuxContext* dv_demux;
187 static const AVCodecTag nsv_codec_video_tags
[] = {
188 { CODEC_ID_VP3
, MKTAG('V', 'P', '3', ' ') },
189 { CODEC_ID_VP3
, MKTAG('V', 'P', '3', '0') },
190 { CODEC_ID_VP3
, MKTAG('V', 'P', '3', '1') },
191 { CODEC_ID_VP5
, MKTAG('V', 'P', '5', ' ') },
192 { CODEC_ID_VP5
, MKTAG('V', 'P', '5', '0') },
193 { CODEC_ID_VP6
, MKTAG('V', 'P', '6', ' ') },
194 { CODEC_ID_VP6
, MKTAG('V', 'P', '6', '0') },
195 { CODEC_ID_VP6
, MKTAG('V', 'P', '6', '1') },
196 { CODEC_ID_VP6
, MKTAG('V', 'P', '6', '2') },
198 { CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') },
199 { CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') },
201 { CODEC_ID_MPEG4
, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */
202 { CODEC_ID_RAWVIDEO
, MKTAG('R', 'G', 'B', '3') },
206 static const AVCodecTag nsv_codec_audio_tags
[] = {
207 { CODEC_ID_MP3
, MKTAG('M', 'P', '3', ' ') },
208 { CODEC_ID_AAC
, MKTAG('A', 'A', 'C', ' ') },
209 { CODEC_ID_AAC
, MKTAG('A', 'A', 'C', 'P') }, /* _CUTTED__MUXED_2 Heads - Out Of The City.nsv */
210 { CODEC_ID_PCM_U16LE
, MKTAG('P', 'C', 'M', ' ') },
214 //static int nsv_load_index(AVFormatContext *s);
215 static int nsv_read_chunk(AVFormatContext
*s
, int fill_header
);
218 static void print_tag(const char *str
, unsigned int tag
, int size
)
220 printf("%s: tag=%c%c%c%c\n",
228 /* try to find something we recognize, and set the state accordingly */
229 static int nsv_resync(AVFormatContext
*s
)
231 NSVContext
*nsv
= s
->priv_data
;
232 ByteIOContext
*pb
= s
->pb
;
236 PRINT(("%s(), offset = %"PRId64
", state = %d\n", __FUNCTION__
, url_ftell(pb
), nsv
->state
));
238 //nsv->state = NSV_UNSYNC;
240 for (i
= 0; i
< NSV_MAX_RESYNC
; i
++) {
242 PRINT(("NSV EOF\n"));
243 nsv
->state
= NSV_UNSYNC
;
250 PRINT(("NSV resync: [%d] = %02x\n", i, v & 0x0FF));
254 if ((v
& 0x0000ffff) == 0xefbe) { /* BEEF */
255 PRINT(("NSV resynced on BEEF after %d bytes\n", i
+1));
256 nsv
->state
= NSV_FOUND_BEEF
;
259 /* we read as big endian, thus the MK*BE* */
260 if (v
== TB_NSVF
) { /* NSVf */
261 PRINT(("NSV resynced on NSVf after %d bytes\n", i
+1));
262 nsv
->state
= NSV_FOUND_NSVF
;
265 if (v
== MKBETAG('N', 'S', 'V', 's')) { /* NSVs */
266 PRINT(("NSV resynced on NSVs after %d bytes\n", i
+1));
267 nsv
->state
= NSV_FOUND_NSVS
;
272 PRINT(("NSV sync lost\n"));
276 static int nsv_parse_NSVf_header(AVFormatContext
*s
, AVFormatParameters
*ap
)
278 NSVContext
*nsv
= s
->priv_data
;
279 ByteIOContext
*pb
= s
->pb
;
280 unsigned int file_size
, size
;
284 int table_entries_used
;
286 PRINT(("%s()\n", __FUNCTION__
));
288 nsv
->state
= NSV_UNSYNC
; /* in case we fail */
293 nsv
->NSVf_end
= size
;
295 //s->file_size = (uint32_t)get_le32(pb);
296 file_size
= (uint32_t)get_le32(pb
);
297 PRINT(("NSV NSVf chunk_size %u\n", size
));
298 PRINT(("NSV NSVf file_size %u\n", file_size
));
300 nsv
->duration
= duration
= get_le32(pb
); /* in ms */
301 PRINT(("NSV NSVf duration %"PRId64
" ms\n", duration
));
302 // XXX: store it in AVStreams
304 strings_size
= get_le32(pb
);
305 table_entries
= get_le32(pb
);
306 table_entries_used
= get_le32(pb
);
307 PRINT(("NSV NSVf info-strings size: %d, table entries: %d, bis %d\n",
308 strings_size
, table_entries
, table_entries_used
));
312 PRINT(("NSV got header; filepos %"PRId64
"\n", url_ftell(pb
)));
314 if (strings_size
> 0) {
315 char *strings
; /* last byte will be '\0' to play safe with str*() */
320 p
= strings
= av_mallocz(strings_size
+ 1);
321 endp
= strings
+ strings_size
;
322 get_buffer(pb
, strings
, strings_size
);
325 p
++; /* strip out spaces */
330 if (!p
|| p
>= endp
-2)
335 p
= strchr(p
, quote
);
339 PRINT(("NSV NSVf INFO: %s='%s'\n", token
, value
));
340 av_metadata_set(&s
->metadata
, token
, value
);
347 PRINT(("NSV got infos; filepos %"PRId64
"\n", url_ftell(pb
)));
349 if (table_entries_used
> 0) {
350 nsv
->index_entries
= table_entries_used
;
351 if((unsigned)table_entries
>= UINT_MAX
/ sizeof(uint32_t))
353 nsv
->nsvf_index_data
= av_malloc(table_entries
* sizeof(uint32_t));
354 #warning "FIXME: Byteswap buffer as needed"
355 get_buffer(pb
, (unsigned char *)nsv
->nsvf_index_data
, table_entries
* sizeof(uint32_t));
358 PRINT(("NSV got index; filepos %"PRId64
"\n", url_ftell(pb
)));
360 #ifdef DEBUG_DUMP_INDEX
361 #define V(v) ((v<0x20 || v > 127)?'.':v)
363 PRINT(("NSV %d INDEX ENTRIES:\n", table_entries
));
364 PRINT(("NSV [dataoffset][fileoffset]\n", table_entries
));
365 for (i
= 0; i
< table_entries
; i
++) {
367 url_fseek(pb
, size
+ nsv
->nsvf_index_data
[i
], SEEK_SET
);
368 get_buffer(pb
, b
, 8);
369 PRINT(("NSV [0x%08lx][0x%08lx]: %02x %02x %02x %02x %02x %02x %02x %02x"
370 "%c%c%c%c%c%c%c%c\n",
371 nsv
->nsvf_index_data
[i
], size
+ nsv
->nsvf_index_data
[i
],
372 b
[0], b
[1], b
[2], b
[3], b
[4], b
[5], b
[6], b
[7],
373 V(b
[0]), V(b
[1]), V(b
[2]), V(b
[3]), V(b
[4]), V(b
[5]), V(b
[6]), V(b
[7]) ));
375 //url_fseek(pb, size, SEEK_SET); /* go back to end of header */
379 url_fseek(pb
, nsv
->base_offset
+ size
, SEEK_SET
); /* required for dumbdriving-271.nsv (2 extra bytes) */
383 nsv
->state
= NSV_HAS_READ_NSVF
;
387 static int nsv_parse_NSVs_header(AVFormatContext
*s
, AVFormatParameters
*ap
)
389 NSVContext
*nsv
= s
->priv_data
;
390 ByteIOContext
*pb
= s
->pb
;
392 uint16_t vwidth
, vheight
;
393 AVRational framerate
;
397 PRINT(("%s()\n", __FUNCTION__
));
401 vwidth
= get_le16(pb
);
402 vheight
= get_le16(pb
);
405 PRINT(("NSV NSVs framerate code %2x\n", i
));
406 if(i
&0x80) { /* odd way of giving native framerates from docs */
408 if(t
<16) framerate
= (AVRational
){1, t
+1};
409 else framerate
= (AVRational
){t
-15, 1};
412 framerate
.num
*= 1000;
413 framerate
.den
*= 1001;
416 if((i
&3)==3) framerate
.num
*= 24;
417 else if((i
&3)==2) framerate
.num
*= 25;
418 else framerate
.num
*= 30;
421 framerate
= (AVRational
){i
, 1};
423 nsv
->avsync
= get_le16(pb
);
424 nsv
->framerate
= framerate
;
426 print_tag("NSV NSVs vtag", vtag
, 0);
427 print_tag("NSV NSVs atag", atag
, 0);
428 PRINT(("NSV NSVs vsize %dx%d\n", vwidth
, vheight
));
431 /* XXX change to ap != NULL ? */
432 if (s
->nb_streams
== 0) { /* streams not yet published, let's do that */
435 nsv
->vwidth
= vwidth
;
436 nsv
->vheight
= vwidth
;
437 if (vtag
!= T_NONE
) {
438 st
= av_new_stream(s
, NSV_ST_VIDEO
);
442 nst
= av_mallocz(sizeof(NSVStream
));
446 st
->codec
->codec_type
= CODEC_TYPE_VIDEO
;
447 st
->codec
->codec_tag
= vtag
;
448 st
->codec
->codec_id
= codec_get_id(nsv_codec_video_tags
, vtag
);
449 st
->codec
->width
= vwidth
;
450 st
->codec
->height
= vheight
;
451 st
->codec
->bits_per_coded_sample
= 24; /* depth XXX */
453 av_set_pts_info(st
, 64, framerate
.den
, framerate
.num
);
455 st
->duration
= av_rescale(nsv
->duration
, framerate
.num
, 1000*framerate
.den
);
457 if (atag
!= T_NONE
) {
458 #ifndef DISABLE_AUDIO
459 st
= av_new_stream(s
, NSV_ST_AUDIO
);
463 nst
= av_mallocz(sizeof(NSVStream
));
467 st
->codec
->codec_type
= CODEC_TYPE_AUDIO
;
468 st
->codec
->codec_tag
= atag
;
469 st
->codec
->codec_id
= codec_get_id(nsv_codec_audio_tags
, atag
);
471 st
->need_parsing
= AVSTREAM_PARSE_FULL
; /* for PCM we will read a chunk later and put correct info */
473 /* set timebase to common denominator of ms and framerate */
474 av_set_pts_info(st
, 64, 1, framerate
.num
*1000);
476 st
->duration
= (int64_t)nsv
->duration
* framerate
.num
;
479 #ifdef CHECK_SUBSEQUENT_NSVS
481 if (nsv
->vtag
!= vtag
|| nsv
->atag
!= atag
|| nsv
->vwidth
!= vwidth
|| nsv
->vheight
!= vwidth
) {
482 PRINT(("NSV NSVs header values differ from the first one!!!\n"));
485 #endif /* CHECK_SUBSEQUENT_NSVS */
488 nsv
->state
= NSV_HAS_READ_NSVS
;
492 nsv
->state
= NSV_UNSYNC
;
496 static int nsv_read_header(AVFormatContext
*s
, AVFormatParameters
*ap
)
498 NSVContext
*nsv
= s
->priv_data
;
501 PRINT(("%s()\n", __FUNCTION__
));
502 PRINT(("filename '%s'\n", s
->filename
));
504 nsv
->state
= NSV_UNSYNC
;
505 nsv
->ahead
[0].data
= nsv
->ahead
[1].data
= NULL
;
507 for (i
= 0; i
< NSV_MAX_RESYNC_TRIES
; i
++) {
508 if (nsv_resync(s
) < 0)
510 if (nsv
->state
== NSV_FOUND_NSVF
)
511 err
= nsv_parse_NSVf_header(s
, ap
);
512 /* we need the first NSVs also... */
513 if (nsv
->state
== NSV_FOUND_NSVS
) {
514 err
= nsv_parse_NSVs_header(s
, ap
);
515 break; /* we just want the first one */
518 if (s
->nb_streams
< 1) /* no luck so far */
520 /* now read the first chunk, so we can attempt to decode more info */
521 err
= nsv_read_chunk(s
, 1);
523 PRINT(("parsed header\n"));
527 static int nsv_read_chunk(AVFormatContext
*s
, int fill_header
)
529 NSVContext
*nsv
= s
->priv_data
;
530 ByteIOContext
*pb
= s
->pb
;
531 AVStream
*st
[2] = {NULL
, NULL
};
535 uint8_t auxcount
; /* number of aux metadata, also 4 bits of vsize */
541 PRINT(("%s(%d)\n", __FUNCTION__
, fill_header
));
543 if (nsv
->ahead
[0].data
|| nsv
->ahead
[1].data
)
544 return 0; //-1; /* hey! eat what you've in your plate first! */
550 for (i
= 0; i
< NSV_MAX_RESYNC_TRIES
&& nsv
->state
< NSV_FOUND_NSVS
&& !err
; i
++)
554 if (nsv
->state
== NSV_FOUND_NSVS
)
555 err
= nsv_parse_NSVs_header(s
, NULL
);
558 if (nsv
->state
!= NSV_HAS_READ_NSVS
&& nsv
->state
!= NSV_FOUND_BEEF
)
561 auxcount
= get_byte(pb
);
562 vsize
= get_le16(pb
);
563 asize
= get_le16(pb
);
564 vsize
= (vsize
<< 4) | (auxcount
>> 4);
566 PRINT(("NSV CHUNK %d aux, %u bytes video, %d bytes audio\n", auxcount
, vsize
, asize
));
568 for (i
= 0; i
< auxcount
; i
++) {
569 auxsize
= get_le16(pb
);
570 auxtag
= get_le32(pb
);
571 PRINT(("NSV aux data: '%c%c%c%c', %d bytes\n",
573 ((auxtag
>> 8) & 0x0ff),
574 ((auxtag
>> 16) & 0x0ff),
575 ((auxtag
>> 24) & 0x0ff),
577 url_fskip(pb
, auxsize
);
578 vsize
-= auxsize
+ sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming braindead */
583 if (!vsize
&& !asize
) {
584 nsv
->state
= NSV_UNSYNC
;
585 goto null_chunk_retry
;
588 /* map back streams to v,a */
590 st
[s
->streams
[0]->id
] = s
->streams
[0];
592 st
[s
->streams
[1]->id
] = s
->streams
[1];
594 if (vsize
/* && st[NSV_ST_VIDEO]*/) {
595 nst
= st
[NSV_ST_VIDEO
]->priv_data
;
596 pkt
= &nsv
->ahead
[NSV_ST_VIDEO
];
597 av_get_packet(pb
, pkt
, vsize
);
598 pkt
->stream_index
= st
[NSV_ST_VIDEO
]->index
;//NSV_ST_VIDEO;
599 pkt
->dts
= nst
->frame_offset
;
600 pkt
->flags
|= nsv
->state
== NSV_HAS_READ_NSVS
? PKT_FLAG_KEY
: 0; /* keyframe only likely on a sync frame */
602 for (i = 0; i < MIN(8, vsize); i++)
603 PRINT(("NSV video: [%d] = %02x\n", i, pkt->data[i]));
607 ((NSVStream
*)st
[NSV_ST_VIDEO
]->priv_data
)->frame_offset
++;
609 if (asize
/*st[NSV_ST_AUDIO]*/) {
610 nst
= st
[NSV_ST_AUDIO
]->priv_data
;
611 pkt
= &nsv
->ahead
[NSV_ST_AUDIO
];
612 /* read raw audio specific header on the first audio chunk... */
613 /* on ALL audio chunks ?? seems so! */
614 if (asize
&& st
[NSV_ST_AUDIO
]->codec
->codec_tag
== MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) {
619 channels
= get_byte(pb
);
620 samplerate
= get_le16(pb
);
622 PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps
, channels
, samplerate
));
624 st
[NSV_ST_AUDIO
]->need_parsing
= AVSTREAM_PARSE_NONE
; /* we know everything */
626 PRINT(("NSV AUDIO bit/sample != 16 (%d)!!!\n", bps
));
628 bps
/= channels
; // ???
630 st
[NSV_ST_AUDIO
]->codec
->codec_id
= CODEC_ID_PCM_U8
;
631 samplerate
/= 4;/* UGH ??? XXX */
633 st
[NSV_ST_AUDIO
]->codec
->channels
= channels
;
634 st
[NSV_ST_AUDIO
]->codec
->sample_rate
= samplerate
;
635 PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps
, channels
, samplerate
));
638 av_get_packet(pb
, pkt
, asize
);
639 pkt
->stream_index
= st
[NSV_ST_AUDIO
]->index
;//NSV_ST_AUDIO;
640 pkt
->flags
|= nsv
->state
== NSV_HAS_READ_NSVS
? PKT_FLAG_KEY
: 0; /* keyframe only likely on a sync frame */
641 if( nsv
->state
== NSV_HAS_READ_NSVS
&& st
[NSV_ST_VIDEO
] ) {
642 /* on a nsvs frame we have new information on a/v sync */
643 pkt
->dts
= (((NSVStream
*)st
[NSV_ST_VIDEO
]->priv_data
)->frame_offset
-1);
644 pkt
->dts
*= (int64_t)1000 * nsv
->framerate
.den
;
645 pkt
->dts
+= (int64_t)nsv
->avsync
* nsv
->framerate
.num
;
646 PRINT(("NSV AUDIO: sync:%d, dts:%"PRId64
, nsv
->avsync
, pkt
->dts
));
651 nsv
->state
= NSV_UNSYNC
;
656 static int nsv_read_packet(AVFormatContext
*s
, AVPacket
*pkt
)
658 NSVContext
*nsv
= s
->priv_data
;
661 PRINT(("%s()\n", __FUNCTION__
));
663 /* in case we don't already have something to eat ... */
664 if (nsv
->ahead
[0].data
== NULL
&& nsv
->ahead
[1].data
== NULL
)
665 err
= nsv_read_chunk(s
, 0);
669 /* now pick one of the plates */
670 for (i
= 0; i
< 2; i
++) {
671 if (nsv
->ahead
[i
].data
) {
672 PRINT(("%s: using cached packet[%d]\n", __FUNCTION__
, i
));
673 /* avoid the cost of new_packet + memcpy(->data) */
674 memcpy(pkt
, &nsv
->ahead
[i
], sizeof(AVPacket
));
675 nsv
->ahead
[i
].data
= NULL
; /* we ate that one */
680 /* this restaurant is not approvisionned :^] */
684 static int nsv_read_seek(AVFormatContext
*s
, int stream_index
, int64_t timestamp
, int flags
)
687 NSVContext
*avi
= s
->priv_data
;
697 static int nsv_read_close(AVFormatContext
*s
)
700 NSVContext
*nsv
= s
->priv_data
;
702 if (nsv
->index_entries
)
703 av_free(nsv
->nsvf_index_data
);
707 for(i
=0;i
<s
->nb_streams
;i
++) {
708 AVStream
*st
= s
->streams
[i
];
709 NSVStream
*ast
= st
->priv_data
;
711 av_free(ast
->index_entries
);
714 av_free(st
->codec
->palctrl
);
721 static int nsv_probe(AVProbeData
*p
)
724 // PRINT(("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 (p
->buf
[i
+0] == 'N' && p
->buf
[i
+1] == 'S' &&
736 p
->buf
[i
+2] == 'V' && p
->buf
[i
+3] == 's')
737 return AVPROBE_SCORE_MAX
-20;
739 /* so we'll have more luck on extension... */
740 if (match_ext(p
->filename
, "nsv"))
741 return AVPROBE_SCORE_MAX
/2;
742 /* FIXME: add mime-type check */
746 AVInputFormat nsv_demuxer
= {
748 NULL_IF_CONFIG_SMALL("Nullsoft Streaming Video"),