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ffmpeg / libavformat / nsvdec.c @ 01f4895c

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1
/*
2
 * NSV decoder.
3
 * Copyright (c) 2004 The FFmpeg Project.
4
 *
5
 * This library is free software; you can redistribute it and/or
6
 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
11
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13
 * Lesser General Public License for more details.
14
 *
15
 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18
 */
19
#include "avformat.h"
20
#include "avi.h"
21

    
22
#define DEBUG
23
//#define DEBUG_DUMP_INDEX // XXX dumbdriving-271.nsv breaks with it commented!!
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//#define DEBUG_SEEK
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#define CHECK_SUBSEQUENT_NSVS
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//#define DISABLE_AUDIO
27

    
28
/* max bytes to crawl for trying to resync
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 * stupid streaming servers don't start at chunk boundaries...
30
 */
31
#define NSV_MAX_RESYNC (500*1024)
32
#define NSV_MAX_RESYNC_TRIES 300
33

    
34
/*
35
 * First version by Francois Revol - revol@free.fr
36
 * References:
37
 * (1) http://www.multimedia.cx/nsv-format.txt
38
 * seems someone came to the same conclusions as me, and updated it:
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 * (2) http://www.stud.ktu.lt/~vitslav/nsv/nsv-format.txt
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 *     http://www.stud.ktu.lt/~vitslav/nsv/
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 * Sample files:
42
 * (S1) http://www.nullsoft.com/nsv/samples/
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 * http://www.nullsoft.com/nsv/samples/faster.nsv
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 * http://streamripper.sourceforge.net/openbb/read.php?TID=492&page=4
45
 */
46

    
47
/*
48
 * notes on the header (Francois Revol):
49
 * 
50
 * It is followed by strings, then a table, but nothing tells 
51
 * where the table begins according to (1). After checking faster.nsv,
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 * I believe NVSf[16-19] gives the size of the strings data
53
 * (that is the offset of the data table after the header).
54
 * After checking all samples from (S1) all confirms this.
55
 *
56
 * Then, about NSVf[12-15], faster.nsf has 179700. When veiwing it in VLC,
57
 * I noticed there was about 1 NVSs chunk/s, so I ran
58
 * strings faster.nsv | grep NSVs | wc -l
59
 * which gave me 180. That leads me to think that NSVf[12-15] might be the 
60
 * file length in milliseconds.
61
 * Let's try that:
62
 * 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
63
 * except for nstrailer (which doesn't have an NSVf header), it repports correct time.
64
 *
65
 * nsvtrailer.nsv (S1) does not have any NSVf header, only NSVs chunks, 
66
 * so the header seems to not be mandatory. (for streaming).
67
 * 
68
 * index slice duration check (excepts nsvtrailer.nsv):
69
 * 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
70
 */
71

    
72
/*
73
 * TODO:
74
 * - handle timestamps !!!
75
 * - use index
76
 * - mime-type in probe()
77
 * - seek
78
 */
79

    
80
#ifdef DEBUG
81
#define PRINT(_v) printf _v
82
#else
83
#define PRINT(_v) 
84
#endif
85

    
86
#if 0
87
struct NSVf_header {
88
    uint32_t chunk_tag; /* 'NSVf' */
89
    uint32_t chunk_size;
90
    uint32_t file_size; /* max 4GB ??? noone learns anything it seems :^) */
91
    uint32_t file_length; //unknown1;  /* what about MSB of file_size ? */
92
    uint32_t info_strings_size; /* size of the info strings */ //unknown2;
93
    uint32_t table_entries;
94
    uint32_t table_entries_used; /* the left ones should be -1 */
95
};
96

97
struct NSVs_header {
98
    uint32_t chunk_tag; /* 'NSVs' */
99
    uint32_t v4cc;      /* or 'NONE' */
100
    uint32_t a4cc;      /* or 'NONE' */
101
    uint16_t vwidth;    /* assert(vwidth%16==0) */
102
    uint16_t vheight;   /* assert(vheight%16==0) */
103
    uint8_t framerate;  /* value = (framerate&0x80)?frtable[frameratex0x7f]:framerate */
104
    uint16_t unknown;
105
};
106

107
struct nsv_avchunk_header {
108
    uint8_t vchunk_size_lsb;
109
    uint16_t vchunk_size_msb; /* value = (vchunk_size_msb << 4) | (vchunk_size_lsb >> 4) */
110
    uint16_t achunk_size;
111
};
112

113
struct nsv_pcm_header {
114
    uint8_t bits_per_sample;
115
    uint8_t channel_count;
116
    uint16_t sample_rate;
117
};
118
#endif
119

    
120
/* variation from avi.h */
121
/*typedef struct CodecTag {
122
    int id;
123
    unsigned int tag;
124
} CodecTag;*/
125

    
126
/* tags */
127

    
128
#define T_NSVF MKTAG('N', 'S', 'V', 'f') /* file header */
129
#define T_NSVS MKTAG('N', 'S', 'V', 's') /* chunk header */
130
#define T_TOC2 MKTAG('T', 'O', 'C', '2') /* extra index marker */
131
#define T_NONE MKTAG('N', 'O', 'N', 'E') /* null a/v 4CC */
132
#define T_SUBT MKTAG('S', 'U', 'B', 'T') /* subtitle aux data */
133
#define T_ASYN MKTAG('A', 'S', 'Y', 'N') /* async a/v aux marker */
134
#define T_KEYF MKTAG('K', 'E', 'Y', 'F') /* video keyframe aux marker (addition) */
135

    
136
#define TB_NSVF MKBETAG('N', 'S', 'V', 'f')
137
#define TB_NSVS MKBETAG('N', 'S', 'V', 's')
138

    
139
/* hardcoded stream indices */
140
#define NSV_ST_VIDEO 0
141
#define NSV_ST_AUDIO 1
142
#define NSV_ST_SUBT 2
143

    
144
enum NSVStatus {
145
    NSV_UNSYNC,
146
    NSV_FOUND_NSVF,
147
    NSV_HAS_READ_NSVF,
148
    NSV_FOUND_NSVS,
149
    NSV_HAS_READ_NSVS,
150
    NSV_FOUND_BEEF,
151
    NSV_GOT_VIDEO,
152
    NSV_GOT_AUDIO,
153
};
154

    
155
typedef struct NSVStream {
156
    int frame_offset; /* current frame (video) or byte (audio) counter
157
                         (used to compute the pts) */
158
    int scale;
159
    int rate;    
160
    int sample_size; /* audio only data */
161
    int start;
162
    
163
    int new_frame_offset; /* temporary storage (used during seek) */
164
    int cum_len; /* temporary storage (used during seek) */
165
} NSVStream;
166

    
167
typedef struct {
168
    int  base_offset;
169
    int  NSVf_end;
170
    uint32_t *nsvf_index_data;
171
    int index_entries;
172
    enum NSVStatus state;
173
    AVPacket ahead[2]; /* [v, a] if .data is !NULL there is something */
174
    /* cached */
175
    int64_t duration;
176
    uint32_t vtag, atag;
177
    uint16_t vwidth, vheight;
178
    //DVDemuxContext* dv_demux;
179
} NSVContext;
180

    
181
static const CodecTag nsv_codec_video_tags[] = {
182
    { CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') },
183
    { CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
184
    { CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
185
/*
186
    { CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') },
187
    { CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') },
188
    { CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') },
189
    { CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
190
    { CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') },
191
    { CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') },
192
    { CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') },
193
    { CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
194
*/
195
    { CODEC_ID_XVID, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */
196
    { CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') },
197
    { 0, 0 },
198
};
199

    
200
static const CodecTag nsv_codec_audio_tags[] = {
201
    { CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') },
202
    { CODEC_ID_AAC, MKTAG('A', 'A', 'C', ' ') },
203
    { CODEC_ID_AAC, MKTAG('A', 'A', 'C', 'P') }, /* _CUTTED__MUXED_2 Heads - Out Of The City.nsv */
204
    { CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') },
205
    { 0, 0 },
206
};
207

    
208
static const AVRational nsv_framerate_table[] = {
209
    {30,1},
210
    {30000,1001},
211
    {25,1},
212
    {24000,1001},
213
    {30,1},
214
    {15000,1001},
215
};
216

    
217
//static int nsv_load_index(AVFormatContext *s);
218
static int nsv_read_chunk(AVFormatContext *s, int fill_header);
219

    
220
#ifdef DEBUG
221
static void print_tag(const char *str, unsigned int tag, int size)
222
{
223
    printf("%s: tag=%c%c%c%c\n",
224
           str, tag & 0xff,
225
           (tag >> 8) & 0xff,
226
           (tag >> 16) & 0xff,
227
           (tag >> 24) & 0xff);
228
}
229
#endif
230

    
231
/* try to find something we recognize, and set the state accordingly */
232
static int nsv_resync(AVFormatContext *s)
233
{
234
    NSVContext *nsv = s->priv_data;
235
    ByteIOContext *pb = &s->pb;
236
    uint32_t v = 0;
237
    int i;
238
    
239
    PRINT(("%s(), offset = %Ld, state = %d\n", __FUNCTION__, url_ftell(pb), nsv->state));
240
    
241
    //nsv->state = NSV_UNSYNC;
242
    
243
    for (i = 0; i < NSV_MAX_RESYNC; i++) {
244
        if (url_feof(pb)) {
245
            PRINT(("NSV EOF\n"));
246
            nsv->state = NSV_UNSYNC;
247
            return -1;
248
        }
249
        v <<= 8;
250
        v |= get_byte(pb);
251
/*
252
        if (i < 8) {
253
            PRINT(("NSV resync: [%d] = %02x\n", i, v & 0x0FF));
254
        }
255
*/
256
        
257
        if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */
258
            PRINT(("NSV resynced on BEEF after %d bytes\n", i+1));
259
            nsv->state = NSV_FOUND_BEEF;
260
            return 0;
261
        }
262
        /* we read as big endian, thus the MK*BE* */
263
        if (v == TB_NSVF) { /* NSVf */
264
            PRINT(("NSV resynced on NSVf after %d bytes\n", i+1));
265
            nsv->state = NSV_FOUND_NSVF;
266
            return 0;
267
        }
268
        if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */
269
            PRINT(("NSV resynced on NSVs after %d bytes\n", i+1));
270
            nsv->state = NSV_FOUND_NSVS;
271
            return 0;
272
        }
273
        
274
    }
275
    PRINT(("NSV sync lost\n"));
276
    return -1;
277
}
278

    
279
static int nsv_parse_NSVf_header(AVFormatContext *s, AVFormatParameters *ap)
280
{
281
    NSVContext *nsv = s->priv_data;
282
    ByteIOContext *pb = &s->pb;
283
    unsigned int file_size, size;
284
    int64_t duration;
285
    int strings_size;
286
    int table_entries;
287
    int table_entries_used;
288

    
289
    PRINT(("%s()\n", __FUNCTION__));
290

    
291
    nsv->state = NSV_UNSYNC; /* in case we fail */
292
    
293
    size = get_le32(pb);
294
    if (size < 28)
295
        return -1;
296
    nsv->NSVf_end = size;
297

    
298
    //s->file_size = (uint32_t)get_le32(pb);
299
    file_size = (uint32_t)get_le32(pb);
300
    PRINT(("NSV NSVf chunk_size %ld\n", size));
301
    PRINT(("NSV NSVf file_size %Ld\n", file_size));
302

    
303
    nsv->duration = duration = get_le32(pb); /* in ms */
304
    PRINT(("NSV NSVf duration %Ld ms\n", duration));
305
    // XXX: store it in AVStreams
306

    
307
    strings_size = get_le32(pb);
308
    table_entries = get_le32(pb);
309
    table_entries_used = get_le32(pb);
310
    PRINT(("NSV NSVf info-strings size: %d, table entries: %d, bis %d\n", 
311
            strings_size, table_entries, table_entries_used));
312
    if (url_feof(pb))
313
        return -1;
314
    
315
    PRINT(("NSV got header; filepos %Ld\n", url_ftell(pb)));
316

    
317
    if (strings_size > 0) {
318
        char *strings; /* last byte will be '\0' to play safe with str*() */
319
        char *p, *endp;
320
        char *token, *value;
321
        char quote;
322

    
323
        p = strings = av_mallocz(strings_size + 1);
324
        endp = strings + strings_size;
325
        get_buffer(pb, strings, strings_size);
326
        while (p < endp) {
327
            while (*p == ' ')
328
                p++; /* strip out spaces */
329
            if (p >= endp-2)
330
                break;
331
            token = p;
332
            p = strchr(p, '=');
333
            if (!p || p >= endp-2)
334
                break;
335
            *p++ = '\0';
336
            quote = *p++;
337
            value = p;
338
            p = strchr(p, quote);
339
            if (!p || p >= endp)
340
                break;
341
            *p++ = '\0';
342
            PRINT(("NSV NSVf INFO: %s='%s'\n", token, value));
343
            if (!strcmp(token, "ASPECT")) {
344
                /* don't care */
345
            } else if (!strcmp(token, "CREATOR") || !strcmp(token, "Author")) {
346
                strncpy(s->author, value, 512-1);
347
            } else if (!strcmp(token, "Copyright")) {
348
                strncpy(s->copyright, value, 512-1);
349
            } else if (!strcmp(token, "TITLE") || !strcmp(token, "Title")) {
350
                strncpy(s->title, value, 512-1);
351
            }
352
        }
353
        av_free(strings);
354
    }
355
    if (url_feof(pb))
356
        return -1;
357
    
358
    PRINT(("NSV got infos; filepos %Ld\n", url_ftell(pb)));
359

    
360
    if (table_entries_used > 0) {
361
        nsv->index_entries = table_entries_used;
362
        if((unsigned)table_entries >= UINT_MAX / sizeof(uint32_t))
363
            return -1;
364
        nsv->nsvf_index_data = av_malloc(table_entries * sizeof(uint32_t));
365
        get_buffer(pb, nsv->nsvf_index_data, table_entries * sizeof(uint32_t));
366
    }
367

    
368
    PRINT(("NSV got index; filepos %Ld\n", url_ftell(pb)));
369
    
370
#ifdef DEBUG_DUMP_INDEX
371
#define V(v) ((v<0x20 || v > 127)?'.':v)
372
    /* dump index */
373
    PRINT(("NSV %d INDEX ENTRIES:\n", table_entries));
374
    PRINT(("NSV [dataoffset][fileoffset]\n", table_entries));
375
    for (i = 0; i < table_entries; i++) {
376
        unsigned char b[8];
377
        url_fseek(pb, size + nsv->nsvf_index_data[i], SEEK_SET);
378
        get_buffer(pb, b, 8);
379
        PRINT(("NSV [0x%08lx][0x%08lx]: %02x %02x %02x %02x %02x %02x %02x %02x"
380
           "%c%c%c%c%c%c%c%c\n",
381
           nsv->nsvf_index_data[i], size + nsv->nsvf_index_data[i],
382
           b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7], 
383
           V(b[0]), V(b[1]), V(b[2]), V(b[3]), V(b[4]), V(b[5]), V(b[6]), V(b[7]) ));
384
    }
385
    //url_fseek(pb, size, SEEK_SET); /* go back to end of header */
386
#undef V
387
#endif
388
    
389
    url_fseek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */
390
    
391
    if (url_feof(pb))
392
        return -1;
393
    nsv->state = NSV_HAS_READ_NSVF;
394
    return 0;
395
}
396

    
397
static int nsv_parse_NSVs_header(AVFormatContext *s, AVFormatParameters *ap)
398
{
399
    NSVContext *nsv = s->priv_data;
400
    ByteIOContext *pb = &s->pb;
401
    uint32_t vtag, atag;
402
    uint16_t vwidth, vheight;
403
    AVRational framerate;
404
    int i;
405
    uint16_t unknown;
406
    AVStream *st;
407
    NSVStream *nst;
408
    PRINT(("%s()\n", __FUNCTION__));
409

    
410
    vtag = get_le32(pb);
411
    atag = get_le32(pb);
412
    vwidth = get_le16(pb);
413
    vheight = get_le16(pb);
414
    i = get_byte(pb);
415
    /* XXX how big must the table be ? */
416
    /* seems there is more to that... */
417
    PRINT(("NSV NSVs framerate code %2x\n", i));
418
    if(i&0x80) framerate= nsv_framerate_table[i & 0x7F];
419
    else       framerate= (AVRational){i, 1};
420
    unknown = get_le16(pb);
421
#ifdef DEBUG
422
    print_tag("NSV NSVs vtag", vtag, 0);
423
    print_tag("NSV NSVs atag", atag, 0);
424
    PRINT(("NSV NSVs vsize %dx%d\n", vwidth, vheight));
425
#endif
426
    
427
    /* XXX change to ap != NULL ? */
428
    if (s->nb_streams == 0) { /* streams not yet published, let's do that */
429
        nsv->vtag = vtag;
430
        nsv->atag = atag;
431
        nsv->vwidth = vwidth;
432
        nsv->vheight = vwidth;
433
        if (vtag != T_NONE) {
434
            st = av_new_stream(s, NSV_ST_VIDEO);
435
            if (!st)
436
                goto fail;
437

    
438
            nst = av_mallocz(sizeof(NSVStream));
439
            if (!nst)
440
                goto fail;
441
            st->priv_data = nst;
442
            st->codec->codec_type = CODEC_TYPE_VIDEO;
443
            st->codec->codec_tag = vtag;
444
            st->codec->codec_id = codec_get_id(nsv_codec_video_tags, vtag);
445
            st->codec->width = vwidth;
446
            st->codec->height = vheight;
447
            st->codec->bits_per_sample = 24; /* depth XXX */
448

    
449
            av_set_pts_info(st, 64, framerate.den, framerate.num);
450
            st->start_time = 0;
451
            st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den);
452
        }
453
        if (atag != T_NONE) {
454
#ifndef DISABLE_AUDIO
455
            st = av_new_stream(s, NSV_ST_AUDIO);
456
            if (!st)
457
                goto fail;
458

    
459
            nst = av_mallocz(sizeof(NSVStream));
460
            if (!nst)
461
                goto fail;
462
            st->priv_data = nst;
463
            st->codec->codec_type = CODEC_TYPE_AUDIO;
464
            st->codec->codec_tag = atag;
465
            st->codec->codec_id = codec_get_id(nsv_codec_audio_tags, atag);
466
            st->start_time = 0;
467
//            st->duration = nsv->duration; //FIXME
468
            
469
            st->need_parsing = 1; /* for PCM we will read a chunk later and put correct info */
470
            /* XXX:FIXME */
471
            //st->codec->channels = 2; //XXX:channels;
472
            //st->codec->sample_rate = 1000;
473
            //av_set_pts_info(st, 64, 1, st->codec->sample_rate);
474

    
475
#endif
476
        }
477
#ifdef CHECK_SUBSEQUENT_NSVS
478
    } else {
479
        if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) {
480
            PRINT(("NSV NSVs header values differ from the first one!!!\n"));
481
            //return -1;
482
        }
483
#endif /* CHECK_SUBSEQUENT_NSVS */
484
    }
485

    
486
    nsv->state = NSV_HAS_READ_NSVS;
487
    return 0;
488
fail:
489
    /* XXX */
490
    nsv->state = NSV_UNSYNC;
491
    return -1;
492
}
493

    
494
static int nsv_read_header(AVFormatContext *s, AVFormatParameters *ap)
495
{
496
    NSVContext *nsv = s->priv_data;
497
    int i, err;
498

    
499
    PRINT(("%s()\n", __FUNCTION__));
500
    PRINT(("filename '%s'\n", s->filename));
501

    
502
    nsv->state = NSV_UNSYNC;
503
    nsv->ahead[0].data = nsv->ahead[1].data = NULL;
504
    
505
    for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
506
        if (nsv_resync(s) < 0)
507
            return -1;
508
        if (nsv->state == NSV_FOUND_NSVF)
509
            err = nsv_parse_NSVf_header(s, ap);
510
            /* we need the first NSVs also... */
511
        if (nsv->state == NSV_FOUND_NSVS) {
512
            err = nsv_parse_NSVs_header(s, ap);
513
            break; /* we just want the first one */
514
        }
515
    }
516
    if (s->nb_streams < 1) /* no luck so far */
517
        return -1;
518
    /* now read the first chunk, so we can attempt to decode more info */
519
    err = nsv_read_chunk(s, 1);
520
    
521
    PRINT(("parsed header\n"));
522
    return 0;
523
}
524

    
525
static int nsv_read_chunk(AVFormatContext *s, int fill_header)
526
{
527
    NSVContext *nsv = s->priv_data;
528
    ByteIOContext *pb = &s->pb;
529
    AVStream *st[2] = {NULL, NULL};
530
    NSVStream *nst;
531
    AVPacket *pkt;
532
    int i, err = 0;
533
    uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */
534
    uint32_t vsize;
535
    uint16_t asize;
536
    uint16_t auxsize;
537
    uint32_t auxtag;
538
    
539
    PRINT(("%s(%d)\n", __FUNCTION__, fill_header));
540
    
541
    if (nsv->ahead[0].data || nsv->ahead[1].data)
542
        return 0; //-1; /* hey! eat what you've in your plate first! */
543

    
544
null_chunk_retry:
545
    if (url_feof(pb))
546
        return -1;
547
    
548
    for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++)
549
        err = nsv_resync(s);
550
    if (err < 0)
551
        return err;
552
    if (nsv->state == NSV_FOUND_NSVS)
553
        err = nsv_parse_NSVs_header(s, NULL);
554
    if (err < 0)
555
        return err;
556
    if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF)
557
        return -1;
558
    
559
    auxcount = get_byte(pb);
560
    vsize = get_le16(pb);
561
    asize = get_le16(pb);
562
    vsize = (vsize << 4) | (auxcount >> 4);
563
    auxcount &= 0x0f;
564
    PRINT(("NSV CHUNK %d aux, %ld bytes video, %d bytes audio\n", auxcount, vsize, asize));
565
    /* skip aux stuff */
566
    for (i = 0; i < auxcount; i++) {
567
        auxsize = get_le16(pb);
568
        auxtag = get_le32(pb);
569
        PRINT(("NSV aux data: '%c%c%c%c', %d bytes\n", 
570
              (auxtag & 0x0ff), 
571
              ((auxtag >> 8) & 0x0ff), 
572
              ((auxtag >> 16) & 0x0ff),
573
              ((auxtag >> 24) & 0x0ff),
574
              auxsize));
575
        url_fskip(pb, auxsize);
576
        vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming braindead */
577
    }
578
    
579
    if (url_feof(pb))
580
        return -1;
581
    if (!vsize && !asize) {
582
        nsv->state = NSV_UNSYNC;
583
        goto null_chunk_retry;
584
    }
585
    
586
    /* map back streams to v,a */
587
    if (s->streams[0])
588
        st[s->streams[0]->id] = s->streams[0];
589
    if (s->streams[1])
590
        st[s->streams[1]->id] = s->streams[1];
591
    
592
    if (vsize/* && st[NSV_ST_VIDEO]*/) {
593
        nst = st[NSV_ST_VIDEO]->priv_data;
594
        pkt = &nsv->ahead[NSV_ST_VIDEO];
595
        av_get_packet(pb, pkt, vsize);
596
        pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO;
597
        pkt->dts = nst->frame_offset++;
598
        pkt->flags |= PKT_FLAG_KEY; /* stupid format has no way to tell XXX: try the index */
599
/*
600
        for (i = 0; i < MIN(8, vsize); i++)
601
            PRINT(("NSV video: [%d] = %02x\n", i, pkt->data[i]));
602
*/
603
    }
604
    if (asize/*st[NSV_ST_AUDIO]*/) {
605
        nst = st[NSV_ST_AUDIO]->priv_data;
606
        pkt = &nsv->ahead[NSV_ST_AUDIO];
607
        /* read raw audio specific header on the first audio chunk... */
608
        /* on ALL audio chunks ?? seems so! */
609
        if (asize && st[NSV_ST_AUDIO]->codec->codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) {
610
            uint8_t bps;
611
            uint8_t channels;
612
            uint16_t samplerate;
613
            bps = get_byte(pb);
614
            channels = get_byte(pb);
615
            samplerate = get_le16(pb);
616
            asize-=4;
617
            PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %ld\n", bps, channels, samplerate));
618
            if (fill_header) {
619
                st[NSV_ST_AUDIO]->need_parsing = 0; /* we know everything */
620
                if (bps != 16) {
621
                    PRINT(("NSV AUDIO bit/sample != 16 (%d)!!!\n", bps));
622
                }
623
                bps /= channels; // ???
624
                if (bps == 8)
625
                    st[NSV_ST_AUDIO]->codec->codec_id = CODEC_ID_PCM_U8;
626
                samplerate /= 4;/* UGH ??? XXX */
627
                channels = 1;
628
                st[NSV_ST_AUDIO]->codec->channels = channels;
629
                st[NSV_ST_AUDIO]->codec->sample_rate = samplerate;
630
                av_set_pts_info(st[NSV_ST_AUDIO], 64, 1, 
631
                                st[NSV_ST_AUDIO]->codec->sample_rate);
632
                PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %ld\n", bps, channels, samplerate));
633
            }
634
        }
635
        av_get_packet(pb, pkt, asize);
636
        pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO;
637
        //pkt->dts = nst->frame_offset;
638
        //if (nst->sample_size)
639
        //    pkt->dts /= nst->sample_size;
640
        nst->frame_offset += asize; // XXX: that's valid only for PCM !?
641
    }
642
    
643
    //pkt->flags |= PKT_FLAG_KEY;
644
    nsv->state = NSV_UNSYNC;
645
    return 0;
646
}
647

    
648

    
649
static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
650
{
651
    NSVContext *nsv = s->priv_data;
652
    int i, err = 0;
653

    
654
    PRINT(("%s()\n", __FUNCTION__));
655
    
656
    /* in case we don't already have something to eat ... */
657
    if (nsv->ahead[0].data == NULL && nsv->ahead[1].data == NULL)
658
        err = nsv_read_chunk(s, 0);
659
    if (err < 0)
660
        return err;
661
    
662
    /* now pick one of the plates */
663
    for (i = 0; i < 2; i++) {
664
        if (nsv->ahead[i].data) {
665
                PRINT(("%s: using cached packet[%d]\n", __FUNCTION__, i));
666
            /* avoid the cost of new_packet + memcpy(->data) */
667
            memcpy(pkt, &nsv->ahead[i], sizeof(AVPacket));
668
            nsv->ahead[i].data = NULL; /* we ate that one */
669
            return pkt->size;
670
        }
671
    }
672
    
673
    /* this restaurant is not approvisionned :^] */
674
    return -1;
675
}
676

    
677
static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
678
{
679
#if 0
680
    NSVContext *avi = s->priv_data;
681
    AVStream *st;
682
    NSVStream *ast;
683
    int frame_number, i;
684
    int64_t pos;
685
#endif
686

    
687
    return -1;
688
}
689

    
690
static int nsv_read_close(AVFormatContext *s)
691
{
692
/*     int i; */
693
    NSVContext *nsv = s->priv_data;
694

    
695
    if (nsv->index_entries)
696
        av_free(nsv->nsvf_index_data);
697

    
698
#if 0
699

700
    for(i=0;i<s->nb_streams;i++) {
701
        AVStream *st = s->streams[i];
702
        NSVStream *ast = st->priv_data;
703
        if(ast){
704
            av_free(ast->index_entries);
705
            av_free(ast);
706
        }
707
        av_free(st->codec->extradata);
708
        av_free(st->codec->palctrl);
709
    }
710

711
#endif
712
    return 0;
713
}
714

    
715
static int nsv_probe(AVProbeData *p)
716
{
717
    int i;
718
//    PRINT(("nsv_probe(), buf_size %d\n", p->buf_size));
719
    /* check file header */
720
    if (p->buf_size <= 32)
721
        return 0;
722
    if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
723
        p->buf[2] == 'V' && p->buf[3] == 'f')
724
        return AVPROBE_SCORE_MAX;
725
    /* streamed files might not have any header */
726
    if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
727
        p->buf[2] == 'V' && p->buf[3] == 's')
728
        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
    for (i = 1; i < p->buf_size - 3; i++) {
734
        if (p->buf[i+0] == 'N' && p->buf[i+1] == 'S' &&
735
            p->buf[i+2] == 'V' && p->buf[i+3] == 's')
736
            return AVPROBE_SCORE_MAX-20;
737
    }
738
    /* so we'll have more luck on extension... */
739
    if (match_ext(p->filename, "nsv"))
740
        return AVPROBE_SCORE_MAX-20;
741
    /* FIXME: add mime-type check */
742
    return 0;
743
}
744

    
745
static AVInputFormat nsv_iformat = {
746
    "nsv",
747
    "NullSoft Video format",
748
    sizeof(NSVContext),
749
    nsv_probe,
750
    nsv_read_header,
751
    nsv_read_packet,
752
    nsv_read_close,
753
    nsv_read_seek,
754
};
755

    
756
int nsvdec_init(void)
757
{
758
    av_register_input_format(&nsv_iformat);
759
    return 0;
760
}