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ffmpeg / libavformat / nsvdec.c @ 2f394e1c

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1
/*
2
 * NSV demuxer
3
 * Copyright (c) 2004 The FFmpeg Project.
4
 *
5
 * This file is part of FFmpeg.
6
 *
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 * FFmpeg is free software; you can redistribute it and/or
8
 * 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 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
21
#include "avformat.h"
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#include "riff.h"
23

    
24
//#define DEBUG
25
//#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
29

    
30
/* max bytes to crawl for trying to resync
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 * stupid streaming servers don't start at chunk boundaries...
32
 */
33
#define NSV_MAX_RESYNC (500*1024)
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#define NSV_MAX_RESYNC_TRIES 300
35

    
36
/*
37
 * First version by Francois Revol - revol@free.fr
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 * References:
39
 * (1) http://www.multimedia.cx/nsv-format.txt
40
 * 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:
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 * (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
47
 */
48

    
49
/*
50
 * notes on the header (Francois Revol):
51
 *
52
 * It is followed by strings, then a table, but nothing tells
53
 * 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
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 * (that is the offset of the data table after the header).
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 * After checking all samples from (S1) all confirms this.
57
 *
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 * Then, about NSVf[12-15], faster.nsf has 179700. When veiwing it in VLC,
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 * I noticed there was about 1 NVSs chunk/s, so I ran
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 * strings faster.nsv | grep NSVs | wc -l
61
 * which gave me 180. That leads me to think that NSVf[12-15] might be the
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 * file length in milliseconds.
63
 * Let's try that:
64
 * 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
65
 * except for nstrailer (which doesn't have an NSVf header), it repports correct time.
66
 *
67
 * nsvtrailer.nsv (S1) does not have any NSVf header, only NSVs chunks,
68
 * so the header seems to not be mandatory. (for streaming).
69
 *
70
 * index slice duration check (excepts nsvtrailer.nsv):
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 * 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
72
 */
73

    
74
/*
75
 * TODO:
76
 * - handle timestamps !!!
77
 * - use index
78
 * - mime-type in probe()
79
 * - seek
80
 */
81

    
82
#ifdef DEBUG
83
#define PRINT(_v) printf _v
84
#else
85
#define PRINT(_v)
86
#endif
87

    
88
#if 0
89
struct NSVf_header {
90
    uint32_t chunk_tag; /* 'NSVf' */
91
    uint32_t chunk_size;
92
    uint32_t file_size; /* max 4GB ??? noone learns anything it seems :^) */
93
    uint32_t file_length; //unknown1;  /* what about MSB of file_size ? */
94
    uint32_t info_strings_size; /* size of the info strings */ //unknown2;
95
    uint32_t table_entries;
96
    uint32_t table_entries_used; /* the left ones should be -1 */
97
};
98

99
struct NSVs_header {
100
    uint32_t chunk_tag; /* 'NSVs' */
101
    uint32_t v4cc;      /* or 'NONE' */
102
    uint32_t a4cc;      /* or 'NONE' */
103
    uint16_t vwidth;    /* assert(vwidth%16==0) */
104
    uint16_t vheight;   /* assert(vheight%16==0) */
105
    uint8_t framerate;  /* value = (framerate&0x80)?frtable[frameratex0x7f]:framerate */
106
    uint16_t unknown;
107
};
108

109
struct nsv_avchunk_header {
110
    uint8_t vchunk_size_lsb;
111
    uint16_t vchunk_size_msb; /* value = (vchunk_size_msb << 4) | (vchunk_size_lsb >> 4) */
112
    uint16_t achunk_size;
113
};
114

115
struct nsv_pcm_header {
116
    uint8_t bits_per_sample;
117
    uint8_t channel_count;
118
    uint16_t sample_rate;
119
};
120
#endif
121

    
122
/* variation from avi.h */
123
/*typedef struct CodecTag {
124
    int id;
125
    unsigned int tag;
126
} CodecTag;*/
127

    
128
/* tags */
129

    
130
#define T_NSVF MKTAG('N', 'S', 'V', 'f') /* file header */
131
#define T_NSVS MKTAG('N', 'S', 'V', 's') /* chunk header */
132
#define T_TOC2 MKTAG('T', 'O', 'C', '2') /* extra index marker */
133
#define T_NONE MKTAG('N', 'O', 'N', 'E') /* null a/v 4CC */
134
#define T_SUBT MKTAG('S', 'U', 'B', 'T') /* subtitle aux data */
135
#define T_ASYN MKTAG('A', 'S', 'Y', 'N') /* async a/v aux marker */
136
#define T_KEYF MKTAG('K', 'E', 'Y', 'F') /* video keyframe aux marker (addition) */
137

    
138
#define TB_NSVF MKBETAG('N', 'S', 'V', 'f')
139
#define TB_NSVS MKBETAG('N', 'S', 'V', 's')
140

    
141
/* hardcoded stream indices */
142
#define NSV_ST_VIDEO 0
143
#define NSV_ST_AUDIO 1
144
#define NSV_ST_SUBT 2
145

    
146
enum NSVStatus {
147
    NSV_UNSYNC,
148
    NSV_FOUND_NSVF,
149
    NSV_HAS_READ_NSVF,
150
    NSV_FOUND_NSVS,
151
    NSV_HAS_READ_NSVS,
152
    NSV_FOUND_BEEF,
153
    NSV_GOT_VIDEO,
154
    NSV_GOT_AUDIO,
155
};
156

    
157
typedef struct NSVStream {
158
    int frame_offset; /* current frame (video) or byte (audio) counter
159
                         (used to compute the pts) */
160
    int scale;
161
    int rate;
162
    int sample_size; /* audio only data */
163
    int start;
164

    
165
    int new_frame_offset; /* temporary storage (used during seek) */
166
    int cum_len; /* temporary storage (used during seek) */
167
} NSVStream;
168

    
169
typedef struct {
170
    int  base_offset;
171
    int  NSVf_end;
172
    uint32_t *nsvf_index_data;
173
    int index_entries;
174
    enum NSVStatus state;
175
    AVPacket ahead[2]; /* [v, a] if .data is !NULL there is something */
176
    /* cached */
177
    int64_t duration;
178
    uint32_t vtag, atag;
179
    uint16_t vwidth, vheight;
180
    int16_t avsync;
181
    //DVDemuxContext* dv_demux;
182
} NSVContext;
183

    
184
static const CodecTag nsv_codec_video_tags[] = {
185
    { CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') },
186
    { CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
187
    { CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
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', '2') },
191
/*
192
    { CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') },
193
    { CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') },
194
    { CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') },
195
    { CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') },
196
    { CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') },
197
*/
198
    { CODEC_ID_XVID, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */
199
    { CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') },
200
    { 0, 0 },
201
};
202

    
203
static const CodecTag nsv_codec_audio_tags[] = {
204
    { CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') },
205
    { CODEC_ID_AAC, MKTAG('A', 'A', 'C', ' ') },
206
    { CODEC_ID_AAC, MKTAG('A', 'A', 'C', 'P') }, /* _CUTTED__MUXED_2 Heads - Out Of The City.nsv */
207
    { CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') },
208
    { 0, 0 },
209
};
210

    
211
static const AVRational nsv_framerate_table[] = {
212
    {30,1},
213
    {30000,1001},
214
    {25,1},
215
    {24000,1001},
216
    {30,1},
217
    {15000,1001},
218
};
219

    
220
//static int nsv_load_index(AVFormatContext *s);
221
static int nsv_read_chunk(AVFormatContext *s, int fill_header);
222

    
223
#ifdef DEBUG
224
static void print_tag(const char *str, unsigned int tag, int size)
225
{
226
    printf("%s: tag=%c%c%c%c\n",
227
           str, tag & 0xff,
228
           (tag >> 8) & 0xff,
229
           (tag >> 16) & 0xff,
230
           (tag >> 24) & 0xff);
231
}
232
#endif
233

    
234
/* try to find something we recognize, and set the state accordingly */
235
static int nsv_resync(AVFormatContext *s)
236
{
237
    NSVContext *nsv = s->priv_data;
238
    ByteIOContext *pb = &s->pb;
239
    uint32_t v = 0;
240
    int i;
241

    
242
    PRINT(("%s(), offset = %"PRId64", state = %d\n", __FUNCTION__, url_ftell(pb), nsv->state));
243

    
244
    //nsv->state = NSV_UNSYNC;
245

    
246
    for (i = 0; i < NSV_MAX_RESYNC; i++) {
247
        if (url_feof(pb)) {
248
            PRINT(("NSV EOF\n"));
249
            nsv->state = NSV_UNSYNC;
250
            return -1;
251
        }
252
        v <<= 8;
253
        v |= get_byte(pb);
254
/*
255
        if (i < 8) {
256
            PRINT(("NSV resync: [%d] = %02x\n", i, v & 0x0FF));
257
        }
258
*/
259

    
260
        if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */
261
            PRINT(("NSV resynced on BEEF after %d bytes\n", i+1));
262
            nsv->state = NSV_FOUND_BEEF;
263
            return 0;
264
        }
265
        /* we read as big endian, thus the MK*BE* */
266
        if (v == TB_NSVF) { /* NSVf */
267
            PRINT(("NSV resynced on NSVf after %d bytes\n", i+1));
268
            nsv->state = NSV_FOUND_NSVF;
269
            return 0;
270
        }
271
        if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */
272
            PRINT(("NSV resynced on NSVs after %d bytes\n", i+1));
273
            nsv->state = NSV_FOUND_NSVS;
274
            return 0;
275
        }
276

    
277
    }
278
    PRINT(("NSV sync lost\n"));
279
    return -1;
280
}
281

    
282
static int nsv_parse_NSVf_header(AVFormatContext *s, AVFormatParameters *ap)
283
{
284
    NSVContext *nsv = s->priv_data;
285
    ByteIOContext *pb = &s->pb;
286
    unsigned int file_size, size;
287
    int64_t duration;
288
    int strings_size;
289
    int table_entries;
290
    int table_entries_used;
291

    
292
    PRINT(("%s()\n", __FUNCTION__));
293

    
294
    nsv->state = NSV_UNSYNC; /* in case we fail */
295

    
296
    size = get_le32(pb);
297
    if (size < 28)
298
        return -1;
299
    nsv->NSVf_end = size;
300

    
301
    //s->file_size = (uint32_t)get_le32(pb);
302
    file_size = (uint32_t)get_le32(pb);
303
    PRINT(("NSV NSVf chunk_size %u\n", size));
304
    PRINT(("NSV NSVf file_size %u\n", file_size));
305

    
306
    nsv->duration = duration = get_le32(pb); /* in ms */
307
    PRINT(("NSV NSVf duration %"PRId64" ms\n", duration));
308
    // XXX: store it in AVStreams
309

    
310
    strings_size = get_le32(pb);
311
    table_entries = get_le32(pb);
312
    table_entries_used = get_le32(pb);
313
    PRINT(("NSV NSVf info-strings size: %d, table entries: %d, bis %d\n",
314
            strings_size, table_entries, table_entries_used));
315
    if (url_feof(pb))
316
        return -1;
317

    
318
    PRINT(("NSV got header; filepos %"PRId64"\n", url_ftell(pb)));
319

    
320
    if (strings_size > 0) {
321
        char *strings; /* last byte will be '\0' to play safe with str*() */
322
        char *p, *endp;
323
        char *token, *value;
324
        char quote;
325

    
326
        p = strings = av_mallocz(strings_size + 1);
327
        endp = strings + strings_size;
328
        get_buffer(pb, strings, strings_size);
329
        while (p < endp) {
330
            while (*p == ' ')
331
                p++; /* strip out spaces */
332
            if (p >= endp-2)
333
                break;
334
            token = p;
335
            p = strchr(p, '=');
336
            if (!p || p >= endp-2)
337
                break;
338
            *p++ = '\0';
339
            quote = *p++;
340
            value = p;
341
            p = strchr(p, quote);
342
            if (!p || p >= endp)
343
                break;
344
            *p++ = '\0';
345
            PRINT(("NSV NSVf INFO: %s='%s'\n", token, value));
346
            if (!strcmp(token, "ASPECT")) {
347
                /* don't care */
348
            } else if (!strcmp(token, "CREATOR") || !strcmp(token, "Author")) {
349
                strncpy(s->author, value, 512-1);
350
            } else if (!strcmp(token, "Copyright")) {
351
                strncpy(s->copyright, value, 512-1);
352
            } else if (!strcmp(token, "TITLE") || !strcmp(token, "Title")) {
353
                strncpy(s->title, value, 512-1);
354
            }
355
        }
356
        av_free(strings);
357
    }
358
    if (url_feof(pb))
359
        return -1;
360

    
361
    PRINT(("NSV got infos; filepos %"PRId64"\n", url_ftell(pb)));
362

    
363
    if (table_entries_used > 0) {
364
        nsv->index_entries = table_entries_used;
365
        if((unsigned)table_entries >= UINT_MAX / sizeof(uint32_t))
366
            return -1;
367
        nsv->nsvf_index_data = av_malloc(table_entries * sizeof(uint32_t));
368
#warning "FIXME: Byteswap buffer as needed"
369
        get_buffer(pb, (unsigned char *)nsv->nsvf_index_data, table_entries * sizeof(uint32_t));
370
    }
371

    
372
    PRINT(("NSV got index; filepos %"PRId64"\n", url_ftell(pb)));
373

    
374
#ifdef DEBUG_DUMP_INDEX
375
#define V(v) ((v<0x20 || v > 127)?'.':v)
376
    /* dump index */
377
    PRINT(("NSV %d INDEX ENTRIES:\n", table_entries));
378
    PRINT(("NSV [dataoffset][fileoffset]\n", table_entries));
379
    for (i = 0; i < table_entries; i++) {
380
        unsigned char b[8];
381
        url_fseek(pb, size + nsv->nsvf_index_data[i], SEEK_SET);
382
        get_buffer(pb, b, 8);
383
        PRINT(("NSV [0x%08lx][0x%08lx]: %02x %02x %02x %02x %02x %02x %02x %02x"
384
           "%c%c%c%c%c%c%c%c\n",
385
           nsv->nsvf_index_data[i], size + nsv->nsvf_index_data[i],
386
           b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7],
387
           V(b[0]), V(b[1]), V(b[2]), V(b[3]), V(b[4]), V(b[5]), V(b[6]), V(b[7]) ));
388
    }
389
    //url_fseek(pb, size, SEEK_SET); /* go back to end of header */
390
#undef V
391
#endif
392

    
393
    url_fseek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */
394

    
395
    if (url_feof(pb))
396
        return -1;
397
    nsv->state = NSV_HAS_READ_NSVF;
398
    return 0;
399
}
400

    
401
static int nsv_parse_NSVs_header(AVFormatContext *s, AVFormatParameters *ap)
402
{
403
    NSVContext *nsv = s->priv_data;
404
    ByteIOContext *pb = &s->pb;
405
    uint32_t vtag, atag;
406
    uint16_t vwidth, vheight;
407
    AVRational framerate;
408
    int i;
409
    AVStream *st;
410
    NSVStream *nst;
411
    PRINT(("%s()\n", __FUNCTION__));
412

    
413
    vtag = get_le32(pb);
414
    atag = get_le32(pb);
415
    vwidth = get_le16(pb);
416
    vheight = get_le16(pb);
417
    i = get_byte(pb);
418
    /* XXX how big must the table be ? */
419
    /* seems there is more to that... */
420
    PRINT(("NSV NSVs framerate code %2x\n", i));
421
    if(i&0x80) framerate= nsv_framerate_table[i & 0x7F];
422
    else       framerate= (AVRational){i, 1};
423
    nsv->avsync = get_le16(pb);
424
#ifdef DEBUG
425
    print_tag("NSV NSVs vtag", vtag, 0);
426
    print_tag("NSV NSVs atag", atag, 0);
427
    PRINT(("NSV NSVs vsize %dx%d\n", vwidth, vheight));
428
#endif
429

    
430
    /* XXX change to ap != NULL ? */
431
    if (s->nb_streams == 0) { /* streams not yet published, let's do that */
432
        nsv->vtag = vtag;
433
        nsv->atag = atag;
434
        nsv->vwidth = vwidth;
435
        nsv->vheight = vwidth;
436
        if (vtag != T_NONE) {
437
            st = av_new_stream(s, NSV_ST_VIDEO);
438
            if (!st)
439
                goto fail;
440

    
441
            nst = av_mallocz(sizeof(NSVStream));
442
            if (!nst)
443
                goto fail;
444
            st->priv_data = nst;
445
            st->codec->codec_type = CODEC_TYPE_VIDEO;
446
            st->codec->codec_tag = vtag;
447
            st->codec->codec_id = codec_get_id(nsv_codec_video_tags, vtag);
448
            st->codec->width = vwidth;
449
            st->codec->height = vheight;
450
            st->codec->bits_per_sample = 24; /* depth XXX */
451

    
452
            av_set_pts_info(st, 64, framerate.den, framerate.num);
453
            st->start_time = 0;
454
            st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den);
455
        }
456
        if (atag != T_NONE) {
457
#ifndef DISABLE_AUDIO
458
            st = av_new_stream(s, NSV_ST_AUDIO);
459
            if (!st)
460
                goto fail;
461

    
462
            nst = av_mallocz(sizeof(NSVStream));
463
            if (!nst)
464
                goto fail;
465
            st->priv_data = nst;
466
            st->codec->codec_type = CODEC_TYPE_AUDIO;
467
            st->codec->codec_tag = atag;
468
            st->codec->codec_id = codec_get_id(nsv_codec_audio_tags, atag);
469

    
470
            st->need_parsing = 1; /* for PCM we will read a chunk later and put correct info */
471

    
472
            /* set timebase to common denominator of ms and framerate */
473
            av_set_pts_info(st, 64, 1, framerate.num*1000);
474
            st->start_time = 0;
475
            st->duration = (int64_t)nsv->duration * framerate.num;
476
#endif
477
        }
478
#ifdef CHECK_SUBSEQUENT_NSVS
479
    } else {
480
        if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) {
481
            PRINT(("NSV NSVs header values differ from the first one!!!\n"));
482
            //return -1;
483
        }
484
#endif /* CHECK_SUBSEQUENT_NSVS */
485
    }
486

    
487
    nsv->state = NSV_HAS_READ_NSVS;
488
    return 0;
489
fail:
490
    /* XXX */
491
    nsv->state = NSV_UNSYNC;
492
    return -1;
493
}
494

    
495
static int nsv_read_header(AVFormatContext *s, AVFormatParameters *ap)
496
{
497
    NSVContext *nsv = s->priv_data;
498
    int i, err;
499

    
500
    PRINT(("%s()\n", __FUNCTION__));
501
    PRINT(("filename '%s'\n", s->filename));
502

    
503
    nsv->state = NSV_UNSYNC;
504
    nsv->ahead[0].data = nsv->ahead[1].data = NULL;
505

    
506
    for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
507
        if (nsv_resync(s) < 0)
508
            return -1;
509
        if (nsv->state == NSV_FOUND_NSVF)
510
            err = nsv_parse_NSVf_header(s, ap);
511
            /* we need the first NSVs also... */
512
        if (nsv->state == NSV_FOUND_NSVS) {
513
            err = nsv_parse_NSVs_header(s, ap);
514
            break; /* we just want the first one */
515
        }
516
    }
517
    if (s->nb_streams < 1) /* no luck so far */
518
        return -1;
519
    /* now read the first chunk, so we can attempt to decode more info */
520
    err = nsv_read_chunk(s, 1);
521

    
522
    PRINT(("parsed header\n"));
523
    return 0;
524
}
525

    
526
static int nsv_read_chunk(AVFormatContext *s, int fill_header)
527
{
528
    NSVContext *nsv = s->priv_data;
529
    ByteIOContext *pb = &s->pb;
530
    AVStream *st[2] = {NULL, NULL};
531
    NSVStream *nst;
532
    AVPacket *pkt;
533
    int i, err = 0;
534
    uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */
535
    uint32_t vsize;
536
    uint16_t asize;
537
    uint16_t auxsize;
538
    uint32_t auxtag;
539

    
540
    PRINT(("%s(%d)\n", __FUNCTION__, fill_header));
541

    
542
    if (nsv->ahead[0].data || nsv->ahead[1].data)
543
        return 0; //-1; /* hey! eat what you've in your plate first! */
544

    
545
null_chunk_retry:
546
    if (url_feof(pb))
547
        return -1;
548

    
549
    for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++)
550
        err = nsv_resync(s);
551
    if (err < 0)
552
        return err;
553
    if (nsv->state == NSV_FOUND_NSVS)
554
        err = nsv_parse_NSVs_header(s, NULL);
555
    if (err < 0)
556
        return err;
557
    if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF)
558
        return -1;
559

    
560
    auxcount = get_byte(pb);
561
    vsize = get_le16(pb);
562
    asize = get_le16(pb);
563
    vsize = (vsize << 4) | (auxcount >> 4);
564
    auxcount &= 0x0f;
565
    PRINT(("NSV CHUNK %d aux, %u bytes video, %d bytes audio\n", auxcount, vsize, asize));
566
    /* skip aux stuff */
567
    for (i = 0; i < auxcount; i++) {
568
        auxsize = get_le16(pb);
569
        auxtag = get_le32(pb);
570
        PRINT(("NSV aux data: '%c%c%c%c', %d bytes\n",
571
              (auxtag & 0x0ff),
572
              ((auxtag >> 8) & 0x0ff),
573
              ((auxtag >> 16) & 0x0ff),
574
              ((auxtag >> 24) & 0x0ff),
575
              auxsize));
576
        url_fskip(pb, auxsize);
577
        vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming braindead */
578
    }
579

    
580
    if (url_feof(pb))
581
        return -1;
582
    if (!vsize && !asize) {
583
        nsv->state = NSV_UNSYNC;
584
        goto null_chunk_retry;
585
    }
586

    
587
    /* map back streams to v,a */
588
    if (s->streams[0])
589
        st[s->streams[0]->id] = s->streams[0];
590
    if (s->streams[1])
591
        st[s->streams[1]->id] = s->streams[1];
592

    
593
    if (vsize/* && st[NSV_ST_VIDEO]*/) {
594
        nst = st[NSV_ST_VIDEO]->priv_data;
595
        pkt = &nsv->ahead[NSV_ST_VIDEO];
596
        av_get_packet(pb, pkt, vsize);
597
        pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO;
598
        pkt->dts = nst->frame_offset++;
599
        pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
600
/*
601
        for (i = 0; i < MIN(8, vsize); i++)
602
            PRINT(("NSV video: [%d] = %02x\n", i, pkt->data[i]));
603
*/
604
    }
605
    if (asize/*st[NSV_ST_AUDIO]*/) {
606
        nst = st[NSV_ST_AUDIO]->priv_data;
607
        pkt = &nsv->ahead[NSV_ST_AUDIO];
608
        /* read raw audio specific header on the first audio chunk... */
609
        /* on ALL audio chunks ?? seems so! */
610
        if (asize && st[NSV_ST_AUDIO]->codec->codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) {
611
            uint8_t bps;
612
            uint8_t channels;
613
            uint16_t samplerate;
614
            bps = get_byte(pb);
615
            channels = get_byte(pb);
616
            samplerate = get_le16(pb);
617
            asize-=4;
618
            PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate));
619
            if (fill_header) {
620
                st[NSV_ST_AUDIO]->need_parsing = 0; /* we know everything */
621
                if (bps != 16) {
622
                    PRINT(("NSV AUDIO bit/sample != 16 (%d)!!!\n", bps));
623
                }
624
                bps /= channels; // ???
625
                if (bps == 8)
626
                    st[NSV_ST_AUDIO]->codec->codec_id = CODEC_ID_PCM_U8;
627
                samplerate /= 4;/* UGH ??? XXX */
628
                channels = 1;
629
                st[NSV_ST_AUDIO]->codec->channels = channels;
630
                st[NSV_ST_AUDIO]->codec->sample_rate = samplerate;
631
                PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate));
632
            }
633
        }
634
        av_get_packet(pb, pkt, asize);
635
        pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO;
636
        pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
637
        if( nsv->state == NSV_HAS_READ_NSVS && st[NSV_ST_VIDEO] ) {
638
            /* on a nsvs frame we have new information on a/v sync */
639
            pkt->dts = (((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset-1);
640
            pkt->dts *= (int64_t)1000 * st[NSV_ST_VIDEO]->time_base.num;
641
            pkt->dts += (int64_t)nsv->avsync * st[NSV_ST_VIDEO]->time_base.den;
642
            PRINT(("NSV AUDIO: sync:%d, dts:%"PRId64, nsv->avsync, pkt->dts));
643
        }
644
        nst->frame_offset++;
645
    }
646

    
647
    nsv->state = NSV_UNSYNC;
648
    return 0;
649
}
650

    
651

    
652
static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
653
{
654
    NSVContext *nsv = s->priv_data;
655
    int i, err = 0;
656

    
657
    PRINT(("%s()\n", __FUNCTION__));
658

    
659
    /* in case we don't already have something to eat ... */
660
    if (nsv->ahead[0].data == NULL && nsv->ahead[1].data == NULL)
661
        err = nsv_read_chunk(s, 0);
662
    if (err < 0)
663
        return err;
664

    
665
    /* now pick one of the plates */
666
    for (i = 0; i < 2; i++) {
667
        if (nsv->ahead[i].data) {
668
                PRINT(("%s: using cached packet[%d]\n", __FUNCTION__, i));
669
            /* avoid the cost of new_packet + memcpy(->data) */
670
            memcpy(pkt, &nsv->ahead[i], sizeof(AVPacket));
671
            nsv->ahead[i].data = NULL; /* we ate that one */
672
            return pkt->size;
673
        }
674
    }
675

    
676
    /* this restaurant is not approvisionned :^] */
677
    return -1;
678
}
679

    
680
static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
681
{
682
#if 0
683
    NSVContext *avi = s->priv_data;
684
    AVStream *st;
685
    NSVStream *ast;
686
    int frame_number, i;
687
    int64_t pos;
688
#endif
689

    
690
    return -1;
691
}
692

    
693
static int nsv_read_close(AVFormatContext *s)
694
{
695
/*     int i; */
696
    NSVContext *nsv = s->priv_data;
697

    
698
    if (nsv->index_entries)
699
        av_free(nsv->nsvf_index_data);
700

    
701
#if 0
702

703
    for(i=0;i<s->nb_streams;i++) {
704
        AVStream *st = s->streams[i];
705
        NSVStream *ast = st->priv_data;
706
        if(ast){
707
            av_free(ast->index_entries);
708
            av_free(ast);
709
        }
710
        av_free(st->codec->palctrl);
711
    }
712

713
#endif
714
    return 0;
715
}
716

    
717
static int nsv_probe(AVProbeData *p)
718
{
719
    int i;
720
//    PRINT(("nsv_probe(), buf_size %d\n", p->buf_size));
721
    /* check file header */
722
    if (p->buf_size <= 32)
723
        return 0;
724
    if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
725
        p->buf[2] == 'V' && p->buf[3] == 'f')
726
        return AVPROBE_SCORE_MAX;
727
    /* streamed files might not have any header */
728
    if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
729
        p->buf[2] == 'V' && p->buf[3] == 's')
730
        return AVPROBE_SCORE_MAX;
731
    /* XXX: do streamed files always start at chunk boundary ?? */
732
    /* or do we need to search NSVs in the byte stream ? */
733
    /* seems the servers don't bother starting clean chunks... */
734
    /* sometimes even the first header is at 9KB or something :^) */
735
    for (i = 1; i < p->buf_size - 3; i++) {
736
        if (p->buf[i+0] == 'N' && p->buf[i+1] == 'S' &&
737
            p->buf[i+2] == 'V' && p->buf[i+3] == 's')
738
            return AVPROBE_SCORE_MAX-20;
739
    }
740
    /* so we'll have more luck on extension... */
741
    if (match_ext(p->filename, "nsv"))
742
        return AVPROBE_SCORE_MAX-20;
743
    /* FIXME: add mime-type check */
744
    return 0;
745
}
746

    
747
AVInputFormat nsv_demuxer = {
748
    "nsv",
749
    "NullSoft Video format",
750
    sizeof(NSVContext),
751
    nsv_probe,
752
    nsv_read_header,
753
    nsv_read_packet,
754
    nsv_read_close,
755
    nsv_read_seek,
756
};