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1
/*
2
 * NSV demuxer
3
 * Copyright (c) 2004 The FFmpeg Project.
4
 *
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 * This file is part of FFmpeg.
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 *
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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,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * 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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 */
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#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

    
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/* max bytes to crawl for trying to resync
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 * stupid streaming servers don't start at chunk boundaries...
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 */
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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 * official docs
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 * (3) http://ultravox.aol.com/NSVFormat.rtf
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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
49
 */
50

    
51
/*
52
 * notes on the header (Francois Revol):
53
 *
54
 * It is followed by strings, then a table, but nothing tells
55
 * 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.
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 *
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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
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 * which gave me 180. That leads me to think that NSVf[12-15] might be the
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 * file length in milliseconds.
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 * Let's try that:
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 * 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
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 * except for nstrailer (which doesn't have an NSVf header), it repports correct time.
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 *
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 * nsvtrailer.nsv (S1) does not have any NSVf header, only NSVs chunks,
70
 * so the header seems to not be mandatory. (for streaming).
71
 *
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 * 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
74
 */
75

    
76
/*
77
 * TODO:
78
 * - handle timestamps !!!
79
 * - use index
80
 * - mime-type in probe()
81
 * - seek
82
 */
83

    
84
#ifdef DEBUG
85
#define PRINT(_v) printf _v
86
#else
87
#define PRINT(_v)
88
#endif
89

    
90
#if 0
91
struct NSVf_header {
92
    uint32_t chunk_tag; /* 'NSVf' */
93
    uint32_t chunk_size;
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 */
99
};
100

101
struct NSVs_header {
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 */
108
    uint16_t unknown;
109
};
110

111
struct nsv_avchunk_header {
112
    uint8_t vchunk_size_lsb;
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    uint16_t vchunk_size_msb; /* value = (vchunk_size_msb << 4) | (vchunk_size_lsb >> 4) */
114
    uint16_t achunk_size;
115
};
116

117
struct nsv_pcm_header {
118
    uint8_t bits_per_sample;
119
    uint8_t channel_count;
120
    uint16_t sample_rate;
121
};
122
#endif
123

    
124
/* variation from avi.h */
125
/*typedef struct CodecTag {
126
    int id;
127
    unsigned int tag;
128
} CodecTag;*/
129

    
130
/* tags */
131

    
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) */
139

    
140
#define TB_NSVF MKBETAG('N', 'S', 'V', 'f')
141
#define TB_NSVS MKBETAG('N', 'S', 'V', 's')
142

    
143
/* hardcoded stream indices */
144
#define NSV_ST_VIDEO 0
145
#define NSV_ST_AUDIO 1
146
#define NSV_ST_SUBT 2
147

    
148
enum NSVStatus {
149
    NSV_UNSYNC,
150
    NSV_FOUND_NSVF,
151
    NSV_HAS_READ_NSVF,
152
    NSV_FOUND_NSVS,
153
    NSV_HAS_READ_NSVS,
154
    NSV_FOUND_BEEF,
155
    NSV_GOT_VIDEO,
156
    NSV_GOT_AUDIO,
157
};
158

    
159
typedef struct NSVStream {
160
    int frame_offset; /* current frame (video) or byte (audio) counter
161
                         (used to compute the pts) */
162
    int scale;
163
    int rate;
164
    int sample_size; /* audio only data */
165
    int start;
166

    
167
    int new_frame_offset; /* temporary storage (used during seek) */
168
    int cum_len; /* temporary storage (used during seek) */
169
} NSVStream;
170

    
171
typedef struct {
172
    int  base_offset;
173
    int  NSVf_end;
174
    uint32_t *nsvf_index_data;
175
    int index_entries;
176
    enum NSVStatus state;
177
    AVPacket ahead[2]; /* [v, a] if .data is !NULL there is something */
178
    /* cached */
179
    int64_t duration;
180
    uint32_t vtag, atag;
181
    uint16_t vwidth, vheight;
182
    int16_t avsync;
183
    //DVDemuxContext* dv_demux;
184
} NSVContext;
185

    
186
static const AVCodecTag nsv_codec_video_tags[] = {
187
    { CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') },
188
    { CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
189
    { CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
190
    { CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') },
191
    { CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
192
    { CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') },
193
    { CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') },
194
    { CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') },
195
    { CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
196
/*
197
    { CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') },
198
    { CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') },
199
*/
200
    { CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */
201
    { CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') },
202
    { 0, 0 },
203
};
204

    
205
static const AVCodecTag nsv_codec_audio_tags[] = {
206
    { CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') },
207
    { CODEC_ID_AAC, MKTAG('A', 'A', 'C', ' ') },
208
    { CODEC_ID_AAC, MKTAG('A', 'A', 'C', 'P') }, /* _CUTTED__MUXED_2 Heads - Out Of The City.nsv */
209
    { CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') },
210
    { 0, 0 },
211
};
212

    
213
//static int nsv_load_index(AVFormatContext *s);
214
static int nsv_read_chunk(AVFormatContext *s, int fill_header);
215

    
216
#ifdef DEBUG
217
static void print_tag(const char *str, unsigned int tag, int size)
218
{
219
    printf("%s: tag=%c%c%c%c\n",
220
           str, tag & 0xff,
221
           (tag >> 8) & 0xff,
222
           (tag >> 16) & 0xff,
223
           (tag >> 24) & 0xff);
224
}
225
#endif
226

    
227
/* try to find something we recognize, and set the state accordingly */
228
static int nsv_resync(AVFormatContext *s)
229
{
230
    NSVContext *nsv = s->priv_data;
231
    ByteIOContext *pb = &s->pb;
232
    uint32_t v = 0;
233
    int i;
234

    
235
    PRINT(("%s(), offset = %"PRId64", state = %d\n", __FUNCTION__, url_ftell(pb), nsv->state));
236

    
237
    //nsv->state = NSV_UNSYNC;
238

    
239
    for (i = 0; i < NSV_MAX_RESYNC; i++) {
240
        if (url_feof(pb)) {
241
            PRINT(("NSV EOF\n"));
242
            nsv->state = NSV_UNSYNC;
243
            return -1;
244
        }
245
        v <<= 8;
246
        v |= get_byte(pb);
247
/*
248
        if (i < 8) {
249
            PRINT(("NSV resync: [%d] = %02x\n", i, v & 0x0FF));
250
        }
251
*/
252

    
253
        if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */
254
            PRINT(("NSV resynced on BEEF after %d bytes\n", i+1));
255
            nsv->state = NSV_FOUND_BEEF;
256
            return 0;
257
        }
258
        /* we read as big endian, thus the MK*BE* */
259
        if (v == TB_NSVF) { /* NSVf */
260
            PRINT(("NSV resynced on NSVf after %d bytes\n", i+1));
261
            nsv->state = NSV_FOUND_NSVF;
262
            return 0;
263
        }
264
        if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */
265
            PRINT(("NSV resynced on NSVs after %d bytes\n", i+1));
266
            nsv->state = NSV_FOUND_NSVS;
267
            return 0;
268
        }
269

    
270
    }
271
    PRINT(("NSV sync lost\n"));
272
    return -1;
273
}
274

    
275
static int nsv_parse_NSVf_header(AVFormatContext *s, AVFormatParameters *ap)
276
{
277
    NSVContext *nsv = s->priv_data;
278
    ByteIOContext *pb = &s->pb;
279
    unsigned int file_size, size;
280
    int64_t duration;
281
    int strings_size;
282
    int table_entries;
283
    int table_entries_used;
284

    
285
    PRINT(("%s()\n", __FUNCTION__));
286

    
287
    nsv->state = NSV_UNSYNC; /* in case we fail */
288

    
289
    size = get_le32(pb);
290
    if (size < 28)
291
        return -1;
292
    nsv->NSVf_end = size;
293

    
294
    //s->file_size = (uint32_t)get_le32(pb);
295
    file_size = (uint32_t)get_le32(pb);
296
    PRINT(("NSV NSVf chunk_size %u\n", size));
297
    PRINT(("NSV NSVf file_size %u\n", file_size));
298

    
299
    nsv->duration = duration = get_le32(pb); /* in ms */
300
    PRINT(("NSV NSVf duration %"PRId64" ms\n", duration));
301
    // XXX: store it in AVStreams
302

    
303
    strings_size = get_le32(pb);
304
    table_entries = get_le32(pb);
305
    table_entries_used = get_le32(pb);
306
    PRINT(("NSV NSVf info-strings size: %d, table entries: %d, bis %d\n",
307
            strings_size, table_entries, table_entries_used));
308
    if (url_feof(pb))
309
        return -1;
310

    
311
    PRINT(("NSV got header; filepos %"PRId64"\n", url_ftell(pb)));
312

    
313
    if (strings_size > 0) {
314
        char *strings; /* last byte will be '\0' to play safe with str*() */
315
        char *p, *endp;
316
        char *token, *value;
317
        char quote;
318

    
319
        p = strings = av_mallocz(strings_size + 1);
320
        endp = strings + strings_size;
321
        get_buffer(pb, strings, strings_size);
322
        while (p < endp) {
323
            while (*p == ' ')
324
                p++; /* strip out spaces */
325
            if (p >= endp-2)
326
                break;
327
            token = p;
328
            p = strchr(p, '=');
329
            if (!p || p >= endp-2)
330
                break;
331
            *p++ = '\0';
332
            quote = *p++;
333
            value = p;
334
            p = strchr(p, quote);
335
            if (!p || p >= endp)
336
                break;
337
            *p++ = '\0';
338
            PRINT(("NSV NSVf INFO: %s='%s'\n", token, value));
339
            if (!strcmp(token, "ASPECT")) {
340
                /* don't care */
341
            } else if (!strcmp(token, "CREATOR") || !strcmp(token, "Author")) {
342
                strncpy(s->author, value, 512-1);
343
            } else if (!strcmp(token, "Copyright")) {
344
                strncpy(s->copyright, value, 512-1);
345
            } else if (!strcmp(token, "TITLE") || !strcmp(token, "Title")) {
346
                strncpy(s->title, value, 512-1);
347
            }
348
        }
349
        av_free(strings);
350
    }
351
    if (url_feof(pb))
352
        return -1;
353

    
354
    PRINT(("NSV got infos; filepos %"PRId64"\n", url_ftell(pb)));
355

    
356
    if (table_entries_used > 0) {
357
        nsv->index_entries = table_entries_used;
358
        if((unsigned)table_entries >= UINT_MAX / sizeof(uint32_t))
359
            return -1;
360
        nsv->nsvf_index_data = av_malloc(table_entries * sizeof(uint32_t));
361
#warning "FIXME: Byteswap buffer as needed"
362
        get_buffer(pb, (unsigned char *)nsv->nsvf_index_data, table_entries * sizeof(uint32_t));
363
    }
364

    
365
    PRINT(("NSV got index; filepos %"PRId64"\n", url_ftell(pb)));
366

    
367
#ifdef DEBUG_DUMP_INDEX
368
#define V(v) ((v<0x20 || v > 127)?'.':v)
369
    /* dump index */
370
    PRINT(("NSV %d INDEX ENTRIES:\n", table_entries));
371
    PRINT(("NSV [dataoffset][fileoffset]\n", table_entries));
372
    for (i = 0; i < table_entries; i++) {
373
        unsigned char b[8];
374
        url_fseek(pb, size + nsv->nsvf_index_data[i], SEEK_SET);
375
        get_buffer(pb, b, 8);
376
        PRINT(("NSV [0x%08lx][0x%08lx]: %02x %02x %02x %02x %02x %02x %02x %02x"
377
           "%c%c%c%c%c%c%c%c\n",
378
           nsv->nsvf_index_data[i], size + nsv->nsvf_index_data[i],
379
           b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7],
380
           V(b[0]), V(b[1]), V(b[2]), V(b[3]), V(b[4]), V(b[5]), V(b[6]), V(b[7]) ));
381
    }
382
    //url_fseek(pb, size, SEEK_SET); /* go back to end of header */
383
#undef V
384
#endif
385

    
386
    url_fseek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */
387

    
388
    if (url_feof(pb))
389
        return -1;
390
    nsv->state = NSV_HAS_READ_NSVF;
391
    return 0;
392
}
393

    
394
static int nsv_parse_NSVs_header(AVFormatContext *s, AVFormatParameters *ap)
395
{
396
    NSVContext *nsv = s->priv_data;
397
    ByteIOContext *pb = &s->pb;
398
    uint32_t vtag, atag;
399
    uint16_t vwidth, vheight;
400
    AVRational framerate;
401
    int i;
402
    AVStream *st;
403
    NSVStream *nst;
404
    PRINT(("%s()\n", __FUNCTION__));
405

    
406
    vtag = get_le32(pb);
407
    atag = get_le32(pb);
408
    vwidth = get_le16(pb);
409
    vheight = get_le16(pb);
410
    i = get_byte(pb);
411

    
412
    PRINT(("NSV NSVs framerate code %2x\n", i));
413
    if(i&0x80) { /* odd way of giving native framerates from docs */
414
        int t=(i & 0x7F)>>2;
415
        if(t<16) framerate = (AVRational){1, t+1};
416
        else     framerate = (AVRational){t-15, 1};
417

    
418
        if(i&1){
419
            framerate.num *= 1000;
420
            framerate.den *= 1001;
421
        }
422

    
423
        if((i&3)==3)      framerate.num *= 24;
424
        else if((i&3)==2) framerate.num *= 25;
425
        else              framerate.num *= 30;
426
    }
427
    else
428
        framerate= (AVRational){i, 1};
429

    
430
    nsv->avsync = get_le16(pb);
431
#ifdef DEBUG
432
    print_tag("NSV NSVs vtag", vtag, 0);
433
    print_tag("NSV NSVs atag", atag, 0);
434
    PRINT(("NSV NSVs vsize %dx%d\n", vwidth, vheight));
435
#endif
436

    
437
    /* XXX change to ap != NULL ? */
438
    if (s->nb_streams == 0) { /* streams not yet published, let's do that */
439
        nsv->vtag = vtag;
440
        nsv->atag = atag;
441
        nsv->vwidth = vwidth;
442
        nsv->vheight = vwidth;
443
        if (vtag != T_NONE) {
444
            st = av_new_stream(s, NSV_ST_VIDEO);
445
            if (!st)
446
                goto fail;
447

    
448
            nst = av_mallocz(sizeof(NSVStream));
449
            if (!nst)
450
                goto fail;
451
            st->priv_data = nst;
452
            st->codec->codec_type = CODEC_TYPE_VIDEO;
453
            st->codec->codec_tag = vtag;
454
            st->codec->codec_id = codec_get_id(nsv_codec_video_tags, vtag);
455
            st->codec->width = vwidth;
456
            st->codec->height = vheight;
457
            st->codec->bits_per_sample = 24; /* depth XXX */
458

    
459
            av_set_pts_info(st, 64, framerate.den, framerate.num);
460
            st->start_time = 0;
461
            st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den);
462
        }
463
        if (atag != T_NONE) {
464
#ifndef DISABLE_AUDIO
465
            st = av_new_stream(s, NSV_ST_AUDIO);
466
            if (!st)
467
                goto fail;
468

    
469
            nst = av_mallocz(sizeof(NSVStream));
470
            if (!nst)
471
                goto fail;
472
            st->priv_data = nst;
473
            st->codec->codec_type = CODEC_TYPE_AUDIO;
474
            st->codec->codec_tag = atag;
475
            st->codec->codec_id = codec_get_id(nsv_codec_audio_tags, atag);
476

    
477
            st->need_parsing = AVSTREAM_PARSE_FULL; /* for PCM we will read a chunk later and put correct info */
478

    
479
            /* set timebase to common denominator of ms and framerate */
480
            av_set_pts_info(st, 64, 1, framerate.num*1000);
481
            st->start_time = 0;
482
            st->duration = (int64_t)nsv->duration * framerate.num;
483
#endif
484
        }
485
#ifdef CHECK_SUBSEQUENT_NSVS
486
    } else {
487
        if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) {
488
            PRINT(("NSV NSVs header values differ from the first one!!!\n"));
489
            //return -1;
490
        }
491
#endif /* CHECK_SUBSEQUENT_NSVS */
492
    }
493

    
494
    nsv->state = NSV_HAS_READ_NSVS;
495
    return 0;
496
fail:
497
    /* XXX */
498
    nsv->state = NSV_UNSYNC;
499
    return -1;
500
}
501

    
502
static int nsv_read_header(AVFormatContext *s, AVFormatParameters *ap)
503
{
504
    NSVContext *nsv = s->priv_data;
505
    int i, err;
506

    
507
    PRINT(("%s()\n", __FUNCTION__));
508
    PRINT(("filename '%s'\n", s->filename));
509

    
510
    nsv->state = NSV_UNSYNC;
511
    nsv->ahead[0].data = nsv->ahead[1].data = NULL;
512

    
513
    for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
514
        if (nsv_resync(s) < 0)
515
            return -1;
516
        if (nsv->state == NSV_FOUND_NSVF)
517
            err = nsv_parse_NSVf_header(s, ap);
518
            /* we need the first NSVs also... */
519
        if (nsv->state == NSV_FOUND_NSVS) {
520
            err = nsv_parse_NSVs_header(s, ap);
521
            break; /* we just want the first one */
522
        }
523
    }
524
    if (s->nb_streams < 1) /* no luck so far */
525
        return -1;
526
    /* now read the first chunk, so we can attempt to decode more info */
527
    err = nsv_read_chunk(s, 1);
528

    
529
    PRINT(("parsed header\n"));
530
    return 0;
531
}
532

    
533
static int nsv_read_chunk(AVFormatContext *s, int fill_header)
534
{
535
    NSVContext *nsv = s->priv_data;
536
    ByteIOContext *pb = &s->pb;
537
    AVStream *st[2] = {NULL, NULL};
538
    NSVStream *nst;
539
    AVPacket *pkt;
540
    int i, err = 0;
541
    uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */
542
    uint32_t vsize;
543
    uint16_t asize;
544
    uint16_t auxsize;
545
    uint32_t auxtag;
546

    
547
    PRINT(("%s(%d)\n", __FUNCTION__, fill_header));
548

    
549
    if (nsv->ahead[0].data || nsv->ahead[1].data)
550
        return 0; //-1; /* hey! eat what you've in your plate first! */
551

    
552
null_chunk_retry:
553
    if (url_feof(pb))
554
        return -1;
555

    
556
    for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++)
557
        err = nsv_resync(s);
558
    if (err < 0)
559
        return err;
560
    if (nsv->state == NSV_FOUND_NSVS)
561
        err = nsv_parse_NSVs_header(s, NULL);
562
    if (err < 0)
563
        return err;
564
    if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF)
565
        return -1;
566

    
567
    auxcount = get_byte(pb);
568
    vsize = get_le16(pb);
569
    asize = get_le16(pb);
570
    vsize = (vsize << 4) | (auxcount >> 4);
571
    auxcount &= 0x0f;
572
    PRINT(("NSV CHUNK %d aux, %u bytes video, %d bytes audio\n", auxcount, vsize, asize));
573
    /* skip aux stuff */
574
    for (i = 0; i < auxcount; i++) {
575
        auxsize = get_le16(pb);
576
        auxtag = get_le32(pb);
577
        PRINT(("NSV aux data: '%c%c%c%c', %d bytes\n",
578
              (auxtag & 0x0ff),
579
              ((auxtag >> 8) & 0x0ff),
580
              ((auxtag >> 16) & 0x0ff),
581
              ((auxtag >> 24) & 0x0ff),
582
              auxsize));
583
        url_fskip(pb, auxsize);
584
        vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming braindead */
585
    }
586

    
587
    if (url_feof(pb))
588
        return -1;
589
    if (!vsize && !asize) {
590
        nsv->state = NSV_UNSYNC;
591
        goto null_chunk_retry;
592
    }
593

    
594
    /* map back streams to v,a */
595
    if (s->streams[0])
596
        st[s->streams[0]->id] = s->streams[0];
597
    if (s->streams[1])
598
        st[s->streams[1]->id] = s->streams[1];
599

    
600
    if (vsize/* && st[NSV_ST_VIDEO]*/) {
601
        nst = st[NSV_ST_VIDEO]->priv_data;
602
        pkt = &nsv->ahead[NSV_ST_VIDEO];
603
        av_get_packet(pb, pkt, vsize);
604
        pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO;
605
        pkt->dts = nst->frame_offset;
606
        pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
607
/*
608
        for (i = 0; i < MIN(8, vsize); i++)
609
            PRINT(("NSV video: [%d] = %02x\n", i, pkt->data[i]));
610
*/
611
    }
612
    ((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset++;
613

    
614
    if (asize/*st[NSV_ST_AUDIO]*/) {
615
        nst = st[NSV_ST_AUDIO]->priv_data;
616
        pkt = &nsv->ahead[NSV_ST_AUDIO];
617
        /* read raw audio specific header on the first audio chunk... */
618
        /* on ALL audio chunks ?? seems so! */
619
        if (asize && st[NSV_ST_AUDIO]->codec->codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) {
620
            uint8_t bps;
621
            uint8_t channels;
622
            uint16_t samplerate;
623
            bps = get_byte(pb);
624
            channels = get_byte(pb);
625
            samplerate = get_le16(pb);
626
            asize-=4;
627
            PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate));
628
            if (fill_header) {
629
                st[NSV_ST_AUDIO]->need_parsing = AVSTREAM_PARSE_NONE; /* we know everything */
630
                if (bps != 16) {
631
                    PRINT(("NSV AUDIO bit/sample != 16 (%d)!!!\n", bps));
632
                }
633
                bps /= channels; // ???
634
                if (bps == 8)
635
                    st[NSV_ST_AUDIO]->codec->codec_id = CODEC_ID_PCM_U8;
636
                samplerate /= 4;/* UGH ??? XXX */
637
                channels = 1;
638
                st[NSV_ST_AUDIO]->codec->channels = channels;
639
                st[NSV_ST_AUDIO]->codec->sample_rate = samplerate;
640
                PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate));
641
            }
642
        }
643
        av_get_packet(pb, pkt, asize);
644
        pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO;
645
        pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
646
        if( nsv->state == NSV_HAS_READ_NSVS && st[NSV_ST_VIDEO] ) {
647
            /* on a nsvs frame we have new information on a/v sync */
648
            pkt->dts = (((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset-1);
649
            pkt->dts *= (int64_t)1000 * st[NSV_ST_VIDEO]->time_base.num;
650
            pkt->dts += (int64_t)nsv->avsync * st[NSV_ST_VIDEO]->time_base.den;
651
            PRINT(("NSV AUDIO: sync:%d, dts:%"PRId64, nsv->avsync, pkt->dts));
652
        }
653
        nst->frame_offset++;
654
    }
655

    
656
    nsv->state = NSV_UNSYNC;
657
    return 0;
658
}
659

    
660

    
661
static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
662
{
663
    NSVContext *nsv = s->priv_data;
664
    int i, err = 0;
665

    
666
    PRINT(("%s()\n", __FUNCTION__));
667

    
668
    /* in case we don't already have something to eat ... */
669
    if (nsv->ahead[0].data == NULL && nsv->ahead[1].data == NULL)
670
        err = nsv_read_chunk(s, 0);
671
    if (err < 0)
672
        return err;
673

    
674
    /* now pick one of the plates */
675
    for (i = 0; i < 2; i++) {
676
        if (nsv->ahead[i].data) {
677
                PRINT(("%s: using cached packet[%d]\n", __FUNCTION__, i));
678
            /* avoid the cost of new_packet + memcpy(->data) */
679
            memcpy(pkt, &nsv->ahead[i], sizeof(AVPacket));
680
            nsv->ahead[i].data = NULL; /* we ate that one */
681
            return pkt->size;
682
        }
683
    }
684

    
685
    /* this restaurant is not approvisionned :^] */
686
    return -1;
687
}
688

    
689
static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
690
{
691
#if 0
692
    NSVContext *avi = s->priv_data;
693
    AVStream *st;
694
    NSVStream *ast;
695
    int frame_number, i;
696
    int64_t pos;
697
#endif
698

    
699
    return -1;
700
}
701

    
702
static int nsv_read_close(AVFormatContext *s)
703
{
704
/*     int i; */
705
    NSVContext *nsv = s->priv_data;
706

    
707
    if (nsv->index_entries)
708
        av_free(nsv->nsvf_index_data);
709

    
710
#if 0
711

712
    for(i=0;i<s->nb_streams;i++) {
713
        AVStream *st = s->streams[i];
714
        NSVStream *ast = st->priv_data;
715
        if(ast){
716
            av_free(ast->index_entries);
717
            av_free(ast);
718
        }
719
        av_free(st->codec->palctrl);
720
    }
721

722
#endif
723
    return 0;
724
}
725

    
726
static int nsv_probe(AVProbeData *p)
727
{
728
    int i;
729
//    PRINT(("nsv_probe(), buf_size %d\n", p->buf_size));
730
    /* check file header */
731
    /* streamed files might not have any header */
732
    if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
733
        p->buf[2] == 'V' && (p->buf[3] == 'f' || p->buf[3] == 's'))
734
        return AVPROBE_SCORE_MAX;
735
    /* XXX: do streamed files always start at chunk boundary ?? */
736
    /* or do we need to search NSVs in the byte stream ? */
737
    /* seems the servers don't bother starting clean chunks... */
738
    /* sometimes even the first header is at 9KB or something :^) */
739
    for (i = 1; i < p->buf_size - 3; i++) {
740
        if (p->buf[i+0] == 'N' && p->buf[i+1] == 'S' &&
741
            p->buf[i+2] == 'V' && p->buf[i+3] == 's')
742
            return AVPROBE_SCORE_MAX-20;
743
    }
744
    /* so we'll have more luck on extension... */
745
    if (match_ext(p->filename, "nsv"))
746
        return AVPROBE_SCORE_MAX/2;
747
    /* FIXME: add mime-type check */
748
    return 0;
749
}
750

    
751
AVInputFormat nsv_demuxer = {
752
    "nsv",
753
    "NullSoft Video format",
754
    sizeof(NSVContext),
755
    nsv_probe,
756
    nsv_read_header,
757
    nsv_read_packet,
758
    nsv_read_close,
759
    nsv_read_seek,
760
};