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ffmpeg / libavformat / nsvdec.c @ 7be806f3

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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
7
 * 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
16
 * 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!!
24
//#define DEBUG_SEEK
25
#define CHECK_SUBSEQUENT_NSVS
26
//#define DISABLE_AUDIO
27

    
28
/* max bytes to crawl for trying to resync
29
 * 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:
39
 * (2) http://www.stud.ktu.lt/~vitslav/nsv/nsv-format.txt
40
 *     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,
52
 * 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 uint64_t nsv_framerate_table[] = {
209
    ((uint64_t)AV_TIME_BASE * 30),
210
    ((uint64_t)AV_TIME_BASE * 30000 / 1001), /* 29.97 */
211
    ((uint64_t)AV_TIME_BASE * 25),
212
    ((uint64_t)AV_TIME_BASE * 24000 / 1001), /* 23.98 */
213
    ((uint64_t)AV_TIME_BASE * 30), /* ?? */
214
    ((uint64_t)AV_TIME_BASE * 15000 / 1001), /* 14.98 */
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
    uint32_t tag, tag1, handler;
284
    int codec_type, stream_index, frame_period, bit_rate, scale, rate;
285
    unsigned int file_size, size, nb_frames;
286
    int64_t duration;
287
    int strings_size;
288
    int table_entries;
289
    int table_entries_used;
290
    int i, n;
291
    AVStream *st;
292
    NSVStream *ast;
293

    
294
    PRINT(("%s()\n", __FUNCTION__));
295

    
296
    nsv->state = NSV_UNSYNC; /* in case we fail */
297
    
298
    size = get_le32(pb);
299
    if (size < 28)
300
        return -1;
301
    nsv->NSVf_end = size;
302

    
303
    //s->file_size = (uint32_t)get_le32(pb);
304
    file_size = (uint32_t)get_le32(pb);
305
    PRINT(("NSV NSVf chunk_size %ld\n", size));
306
    PRINT(("NSV NSVf file_size %Ld\n", file_size));
307

    
308
    duration = get_le32(pb); /* in ms */
309
    nsv->duration = duration * AV_TIME_BASE / 1000; /* convert */
310
    PRINT(("NSV NSVf duration %Ld ms\n", duration));
311
    // XXX: store it in AVStreams
312

    
313
    strings_size = get_le32(pb);
314
    table_entries = get_le32(pb);
315
    table_entries_used = get_le32(pb);
316
    PRINT(("NSV NSVf info-strings size: %d, table entries: %d, bis %d\n", 
317
            strings_size, table_entries, table_entries_used));
318
    if (url_feof(pb))
319
        return -1;
320
    
321
    PRINT(("NSV got header; filepos %Ld\n", url_ftell(pb)));
322

    
323
    if (strings_size > 0) {
324
        char *strings; /* last byte will be '\0' to play safe with str*() */
325
        char *p, *endp;
326
        char *token, *value;
327
        char quote;
328

    
329
        p = strings = av_mallocz(strings_size + 1);
330
        endp = strings + strings_size;
331
        get_buffer(pb, strings, strings_size);
332
        while (p < endp) {
333
            while (*p == ' ')
334
                p++; /* strip out spaces */
335
            if (p >= endp-2)
336
                break;
337
            token = p;
338
            p = strchr(p, '=');
339
            if (!p || p >= endp-2)
340
                break;
341
            *p++ = '\0';
342
            quote = *p++;
343
            value = p;
344
            p = strchr(p, quote);
345
            if (!p || p >= endp)
346
                break;
347
            *p++ = '\0';
348
            PRINT(("NSV NSVf INFO: %s='%s'\n", token, value));
349
            if (!strcmp(token, "ASPECT")) {
350
                /* don't care */
351
            } else if (!strcmp(token, "CREATOR") || !strcmp(token, "Author")) {
352
                strncpy(s->author, value, 512-1);
353
            } else if (!strcmp(token, "Copyright")) {
354
                strncpy(s->copyright, value, 512-1);
355
            } else if (!strcmp(token, "TITLE") || !strcmp(token, "Title")) {
356
                strncpy(s->title, value, 512-1);
357
            }
358
        }
359
        av_free(strings);
360
    }
361
    if (url_feof(pb))
362
        return -1;
363
    
364
    PRINT(("NSV got infos; filepos %Ld\n", url_ftell(pb)));
365

    
366
    if (table_entries_used > 0) {
367
        nsv->index_entries = table_entries_used;
368
        if((unsigned)table_entries >= UINT_MAX / sizeof(uint32_t))
369
            return -1;
370
        nsv->nsvf_index_data = av_malloc(table_entries * sizeof(uint32_t));
371
        get_buffer(pb, nsv->nsvf_index_data, table_entries * sizeof(uint32_t));
372
    }
373

    
374
    PRINT(("NSV got index; filepos %Ld\n", url_ftell(pb)));
375
    
376
#ifdef DEBUG_DUMP_INDEX
377
#define V(v) ((v<0x20 || v > 127)?'.':v)
378
    /* dump index */
379
    PRINT(("NSV %d INDEX ENTRIES:\n", table_entries));
380
    PRINT(("NSV [dataoffset][fileoffset]\n", table_entries));
381
    for (i = 0; i < table_entries; i++) {
382
        unsigned char b[8];
383
        url_fseek(pb, size + nsv->nsvf_index_data[i], SEEK_SET);
384
        get_buffer(pb, b, 8);
385
        PRINT(("NSV [0x%08lx][0x%08lx]: %02x %02x %02x %02x %02x %02x %02x %02x"
386
           "%c%c%c%c%c%c%c%c\n",
387
           nsv->nsvf_index_data[i], size + nsv->nsvf_index_data[i],
388
           b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7], 
389
           V(b[0]), V(b[1]), V(b[2]), V(b[3]), V(b[4]), V(b[5]), V(b[6]), V(b[7]) ));
390
    }
391
    //url_fseek(pb, size, SEEK_SET); /* go back to end of header */
392
#undef V
393
#endif
394
    
395
    url_fseek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */
396
    
397
    if (url_feof(pb))
398
        return -1;
399
    nsv->state = NSV_HAS_READ_NSVF;
400
    return 0;
401
}
402

    
403
static int nsv_parse_NSVs_header(AVFormatContext *s, AVFormatParameters *ap)
404
{
405
    NSVContext *nsv = s->priv_data;
406
    ByteIOContext *pb = &s->pb;
407
    uint32_t vtag, atag;
408
    uint16_t vwidth, vheight;
409
    uint32_t framerate;
410
    uint16_t unknown;
411
    AVStream *st;
412
    NSVStream *nst;
413
    PRINT(("%s()\n", __FUNCTION__));
414

    
415
    vtag = get_le32(pb);
416
    atag = get_le32(pb);
417
    vwidth = get_le16(pb);
418
    vheight = get_le16(pb);
419
    framerate = (uint8_t)get_byte(pb);
420
    /* XXX how big must the table be ? */
421
    /* seems there is more to that... */
422
    PRINT(("NSV NSVs framerate code %2x\n", framerate));
423
    framerate = (framerate & 0x80)?(nsv_framerate_table[framerate & 0x7F]):(framerate*AV_TIME_BASE);
424
    unknown = get_le16(pb);
425
#ifdef DEBUG
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));
429
    PRINT(("NSV NSVs framerate %2x\n", framerate));
430
#endif
431
    
432
    /* XXX change to ap != NULL ? */
433
    if (s->nb_streams == 0) { /* streams not yet published, let's do that */
434
        nsv->vtag = vtag;
435
        nsv->atag = atag;
436
        nsv->vwidth = vwidth;
437
        nsv->vheight = vwidth;
438
        if (vtag != T_NONE) {
439
            st = av_new_stream(s, NSV_ST_VIDEO);
440
            if (!st)
441
                goto fail;
442

    
443
            nst = av_mallocz(sizeof(NSVStream));
444
            if (!nst)
445
                goto fail;
446
            st->priv_data = nst;
447
            st->codec.codec_type = CODEC_TYPE_VIDEO;
448
            st->codec.codec_tag = vtag;
449
            st->codec.codec_id = codec_get_id(nsv_codec_video_tags, vtag);
450
            st->codec.width = vwidth;
451
            st->codec.height = vheight;
452
            st->codec.bits_per_sample = 24; /* depth XXX */
453

    
454
            st->codec.frame_rate = framerate;
455
            st->codec.frame_rate_base = AV_TIME_BASE;
456
            av_set_pts_info(st, 64, AV_TIME_BASE, framerate);
457
            st->start_time = 0;
458
            st->duration = nsv->duration;
459
        }
460
        if (atag != T_NONE) {
461
#ifndef DISABLE_AUDIO
462
            st = av_new_stream(s, NSV_ST_AUDIO);
463
            if (!st)
464
                goto fail;
465

    
466
            nst = av_mallocz(sizeof(NSVStream));
467
            if (!nst)
468
                goto fail;
469
            st->priv_data = nst;
470
            st->codec.codec_type = CODEC_TYPE_AUDIO;
471
            st->codec.codec_tag = atag;
472
            st->codec.codec_id = codec_get_id(nsv_codec_audio_tags, atag);
473
            st->start_time = 0;
474
            st->duration = nsv->duration;
475
            
476
            st->need_parsing = 1; /* for PCM we will read a chunk later and put correct info */
477
            /* XXX:FIXME */
478
            //st->codec.channels = 2; //XXX:channels;
479
            //st->codec.sample_rate = 1000;
480
            //av_set_pts_info(st, 64, 1, st->codec.sample_rate);
481

    
482
#endif
483
        }
484
#ifdef CHECK_SUBSEQUENT_NSVS
485
    } else {
486
        if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) {
487
            PRINT(("NSV NSVs header values differ from the first one!!!\n"));
488
            //return -1;
489
        }
490
#endif /* CHECK_SUBSEQUENT_NSVS */
491
    }
492

    
493
    nsv->state = NSV_HAS_READ_NSVS;
494
    return 0;
495
fail:
496
    /* XXX */
497
    nsv->state = NSV_UNSYNC;
498
    return -1;
499
}
500

    
501
static int nsv_read_header(AVFormatContext *s, AVFormatParameters *ap)
502
{
503
    NSVContext *nsv = s->priv_data;
504
    ByteIOContext *pb = &s->pb;
505
    uint32_t tag, tag1, handler;
506
    int codec_type, stream_index, frame_period, bit_rate, scale, rate;
507
    unsigned int size, nb_frames;
508
    int table_entries;
509
    int i, n, err;
510
    AVStream *st;
511
    NSVStream *ast;
512

    
513
    PRINT(("%s()\n", __FUNCTION__));
514
    PRINT(("filename '%s'\n", s->filename));
515

    
516
    nsv->state = NSV_UNSYNC;
517
    nsv->ahead[0].data = nsv->ahead[1].data = NULL;
518
    
519
    for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
520
        if (nsv_resync(s) < 0)
521
            return -1;
522
        if (nsv->state == NSV_FOUND_NSVF)
523
            err = nsv_parse_NSVf_header(s, ap);
524
            /* we need the first NSVs also... */
525
        if (nsv->state == NSV_FOUND_NSVS) {
526
            err = nsv_parse_NSVs_header(s, ap);
527
            break; /* we just want the first one */
528
        }
529
    }
530
    if (s->nb_streams < 1) /* no luck so far */
531
        return -1;
532
    /* now read the first chunk, so we can attempt to decode more info */
533
    err = nsv_read_chunk(s, 1);
534
    
535
    PRINT(("parsed header\n"));
536
    return 0;
537
}
538

    
539
static int nsv_read_chunk(AVFormatContext *s, int fill_header)
540
{
541
    NSVContext *nsv = s->priv_data;
542
    ByteIOContext *pb = &s->pb;
543
    AVStream *st[2] = {NULL, NULL};
544
    NSVStream *nst;
545
    AVPacket *pkt;
546
    uint32_t v = 0;
547
    int i, err = 0;
548
    uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */
549
    uint32_t vsize;
550
    uint16_t asize;
551
    uint16_t auxsize;
552
    uint32_t auxtag;
553
    
554
    PRINT(("%s(%d)\n", __FUNCTION__, fill_header));
555
    
556
    if (nsv->ahead[0].data || nsv->ahead[1].data)
557
        return 0; //-1; /* hey! eat what you've in your plate first! */
558

    
559
null_chunk_retry:
560
    if (url_feof(pb))
561
        return -1;
562
    
563
    for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++)
564
        err = nsv_resync(s);
565
    if (err < 0)
566
        return err;
567
    if (nsv->state == NSV_FOUND_NSVS)
568
        err = nsv_parse_NSVs_header(s, NULL);
569
    if (err < 0)
570
        return err;
571
    if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF)
572
        return -1;
573
    
574
    auxcount = get_byte(pb);
575
    vsize = get_le16(pb);
576
    asize = get_le16(pb);
577
    vsize = (vsize << 4) | (auxcount >> 4);
578
    auxcount &= 0x0f;
579
    PRINT(("NSV CHUNK %d aux, %ld bytes video, %d bytes audio\n", auxcount, vsize, asize));
580
    /* skip aux stuff */
581
    for (i = 0; i < auxcount; i++) {
582
        auxsize = get_le16(pb);
583
        auxtag = get_le32(pb);
584
        PRINT(("NSV aux data: '%c%c%c%c', %d bytes\n", 
585
              (auxtag & 0x0ff), 
586
              ((auxtag >> 8) & 0x0ff), 
587
              ((auxtag >> 16) & 0x0ff),
588
              ((auxtag >> 24) & 0x0ff),
589
              auxsize));
590
        url_fskip(pb, auxsize);
591
        vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming braindead */
592
    }
593
    
594
    if (url_feof(pb))
595
        return -1;
596
    if (!vsize && !asize) {
597
        nsv->state = NSV_UNSYNC;
598
        goto null_chunk_retry;
599
    }
600
    
601
    /* map back streams to v,a */
602
    if (s->streams[0])
603
        st[s->streams[0]->id] = s->streams[0];
604
    if (s->streams[1])
605
        st[s->streams[1]->id] = s->streams[1];
606
    
607
    if (vsize/* && st[NSV_ST_VIDEO]*/) {
608
        nst = st[NSV_ST_VIDEO]->priv_data;
609
        pkt = &nsv->ahead[NSV_ST_VIDEO];
610
        av_new_packet(pkt, vsize);
611
        get_buffer(pb, pkt->data, vsize);
612
        pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO;
613
        pkt->dts = nst->frame_offset++;
614
        pkt->flags |= PKT_FLAG_KEY; /* stupid format has no way to tell XXX: try the index */
615
/*
616
        for (i = 0; i < MIN(8, vsize); i++)
617
            PRINT(("NSV video: [%d] = %02x\n", i, pkt->data[i]));
618
*/
619
    }
620
    if (asize/*st[NSV_ST_AUDIO]*/) {
621
        nst = st[NSV_ST_AUDIO]->priv_data;
622
        pkt = &nsv->ahead[NSV_ST_AUDIO];
623
        /* read raw audio specific header on the first audio chunk... */
624
        /* on ALL audio chunks ?? seems so! */
625
        if (asize && st[NSV_ST_AUDIO]->codec.codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) {
626
            uint8_t bps;
627
            uint8_t channels;
628
            uint16_t samplerate;
629
            bps = get_byte(pb);
630
            channels = get_byte(pb);
631
            samplerate = get_le16(pb);
632
            asize-=4;
633
            PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %ld\n", bps, channels, samplerate));
634
            if (fill_header) {
635
                st[NSV_ST_AUDIO]->need_parsing = 0; /* we know everything */
636
                if (bps != 16) {
637
                    PRINT(("NSV AUDIO bit/sample != 16 (%d)!!!\n", bps));
638
                }
639
                bps /= channels; // ???
640
                if (bps == 8)
641
                    st[NSV_ST_AUDIO]->codec.codec_id = CODEC_ID_PCM_U8;
642
                samplerate /= 4;/* UGH ??? XXX */
643
                channels = 1;
644
                st[NSV_ST_AUDIO]->codec.channels = channels;
645
                st[NSV_ST_AUDIO]->codec.sample_rate = samplerate;
646
                av_set_pts_info(st[NSV_ST_AUDIO], 64, 1, 
647
                                st[NSV_ST_AUDIO]->codec.sample_rate);
648
                PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %ld\n", bps, channels, samplerate));
649
            }
650
        }
651
        av_new_packet(pkt, asize);
652
        if (asize)
653
            get_buffer(pb, pkt->data, asize);
654
        pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO;
655
        //pkt->dts = nst->frame_offset;
656
        //if (nst->sample_size)
657
        //    pkt->dts /= nst->sample_size;
658
        nst->frame_offset += asize; // XXX: that's valid only for PCM !?
659
    }
660
    
661
    //pkt->flags |= PKT_FLAG_KEY;
662
    nsv->state = NSV_UNSYNC;
663
    return 0;
664
}
665

    
666

    
667
static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
668
{
669
    NSVContext *nsv = s->priv_data;
670
    ByteIOContext *pb = &s->pb;
671
    int i, err = 0;
672

    
673
    PRINT(("%s()\n", __FUNCTION__));
674
    
675
    /* in case we don't already have something to eat ... */
676
    if (nsv->ahead[0].data == NULL && nsv->ahead[1].data == NULL)
677
        err = nsv_read_chunk(s, 0);
678
    if (err < 0)
679
        return err;
680
    
681
    /* now pick one of the plates */
682
    for (i = 0; i < 2; i++) {
683
        if (nsv->ahead[i].data) {
684
                PRINT(("%s: using cached packet[%d]\n", __FUNCTION__, i));
685
            /* avoid the cost of new_packet + memcpy(->data) */
686
            memcpy(pkt, &nsv->ahead[i], sizeof(AVPacket));
687
            nsv->ahead[i].data = NULL; /* we ate that one */
688
            return pkt->size;
689
        }
690
    }
691
    
692
    /* this restaurant is not approvisionned :^] */
693
    return -1;
694
}
695

    
696
static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
697
{
698
    NSVContext *avi = s->priv_data;
699
    AVStream *st;
700
    NSVStream *ast;
701
    int frame_number, i;
702
    int64_t pos;
703

    
704
    return -1;
705
}
706

    
707
static int nsv_read_close(AVFormatContext *s)
708
{
709
    int i;
710
    NSVContext *nsv = s->priv_data;
711

    
712
    if (nsv->index_entries)
713
        av_free(nsv->nsvf_index_data);
714

    
715
#if 0
716

717
    for(i=0;i<s->nb_streams;i++) {
718
        AVStream *st = s->streams[i];
719
        NSVStream *ast = st->priv_data;
720
        if(ast){
721
            av_free(ast->index_entries);
722
            av_free(ast);
723
        }
724
        av_free(st->codec.extradata);
725
        av_free(st->codec.palctrl);
726
    }
727

728
#endif
729
    return 0;
730
}
731

    
732
static int nsv_probe(AVProbeData *p)
733
{
734
    int i;
735
//    PRINT(("nsv_probe(), buf_size %d\n", p->buf_size));
736
    /* check file header */
737
    if (p->buf_size <= 32)
738
        return 0;
739
    if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
740
        p->buf[2] == 'V' && p->buf[3] == 'f')
741
        return AVPROBE_SCORE_MAX;
742
    /* streamed files might not have any header */
743
    if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
744
        p->buf[2] == 'V' && p->buf[3] == 's')
745
        return AVPROBE_SCORE_MAX;
746
    /* XXX: do streamed files always start at chunk boundary ?? */
747
    /* or do we need to search NSVs in the byte stream ? */
748
    /* seems the servers don't bother starting clean chunks... */
749
    /* sometimes even the first header is at 9KB or something :^) */
750
    for (i = 1; i < p->buf_size - 3; i++) {
751
        if (p->buf[i+0] == 'N' && p->buf[i+1] == 'S' &&
752
            p->buf[i+2] == 'V' && p->buf[i+3] == 's')
753
            return AVPROBE_SCORE_MAX-20;
754
    }
755
    /* so we'll have more luck on extension... */
756
    if (match_ext(p->filename, "nsv"))
757
        return AVPROBE_SCORE_MAX-20;
758
    /* FIXME: add mime-type check */
759
    return 0;
760
}
761

    
762
static AVInputFormat nsv_iformat = {
763
    "nsv",
764
    "NullSoft Video format",
765
    sizeof(NSVContext),
766
    nsv_probe,
767
    nsv_read_header,
768
    nsv_read_packet,
769
    nsv_read_close,
770
    nsv_read_seek,
771
};
772

    
773
int nsvdec_init(void)
774
{
775
    av_register_input_format(&nsv_iformat);
776
    return 0;
777
}