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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
10
 * 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
27
#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...
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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:
66
 * for f in *.nsv; do HTIME="$(od -t x4 "$f" | head -1 | sed 's/.* //')"; echo "'$f' $((0x$HTIME))s = $((0x$HTIME/1000/60)):$((0x$HTIME/1000%60))"; done
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 * except for nstrailer (which doesn't have an NSVf header), it repports correct time.
68
 *
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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 indexes */
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
    AVRational framerate;
184
    //DVDemuxContext* dv_demux;
185
} NSVContext;
186

    
187
static const AVCodecTag nsv_codec_video_tags[] = {
188
    { CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') },
189
    { CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
190
    { CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
191
    { CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') },
192
    { CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
193
    { CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') },
194
    { CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') },
195
    { CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') },
196
    { CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
197
/*
198
    { CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') },
199
    { CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') },
200
*/
201
    { CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */
202
    { CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') },
203
    { 0, 0 },
204
};
205

    
206
static const AVCodecTag nsv_codec_audio_tags[] = {
207
    { CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') },
208
    { CODEC_ID_AAC, MKTAG('A', 'A', 'C', ' ') },
209
    { CODEC_ID_AAC, MKTAG('A', 'A', 'C', 'P') }, /* _CUTTED__MUXED_2 Heads - Out Of The City.nsv */
210
    { CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') },
211
    { 0, 0 },
212
};
213

    
214
//static int nsv_load_index(AVFormatContext *s);
215
static int nsv_read_chunk(AVFormatContext *s, int fill_header);
216

    
217
#ifdef DEBUG
218
static void print_tag(const char *str, unsigned int tag, int size)
219
{
220
    printf("%s: tag=%c%c%c%c\n",
221
           str, tag & 0xff,
222
           (tag >> 8) & 0xff,
223
           (tag >> 16) & 0xff,
224
           (tag >> 24) & 0xff);
225
}
226
#endif
227

    
228
/* try to find something we recognize, and set the state accordingly */
229
static int nsv_resync(AVFormatContext *s)
230
{
231
    NSVContext *nsv = s->priv_data;
232
    ByteIOContext *pb = s->pb;
233
    uint32_t v = 0;
234
    int i;
235

    
236
    PRINT(("%s(), offset = %"PRId64", state = %d\n", __FUNCTION__, url_ftell(pb), nsv->state));
237

    
238
    //nsv->state = NSV_UNSYNC;
239

    
240
    for (i = 0; i < NSV_MAX_RESYNC; i++) {
241
        if (url_feof(pb)) {
242
            PRINT(("NSV EOF\n"));
243
            nsv->state = NSV_UNSYNC;
244
            return -1;
245
        }
246
        v <<= 8;
247
        v |= get_byte(pb);
248
/*
249
        if (i < 8) {
250
            PRINT(("NSV resync: [%d] = %02x\n", i, v & 0x0FF));
251
        }
252
*/
253

    
254
        if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */
255
            PRINT(("NSV resynced on BEEF after %d bytes\n", i+1));
256
            nsv->state = NSV_FOUND_BEEF;
257
            return 0;
258
        }
259
        /* we read as big endian, thus the MK*BE* */
260
        if (v == TB_NSVF) { /* NSVf */
261
            PRINT(("NSV resynced on NSVf after %d bytes\n", i+1));
262
            nsv->state = NSV_FOUND_NSVF;
263
            return 0;
264
        }
265
        if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */
266
            PRINT(("NSV resynced on NSVs after %d bytes\n", i+1));
267
            nsv->state = NSV_FOUND_NSVS;
268
            return 0;
269
        }
270

    
271
    }
272
    PRINT(("NSV sync lost\n"));
273
    return -1;
274
}
275

    
276
static int nsv_parse_NSVf_header(AVFormatContext *s, AVFormatParameters *ap)
277
{
278
    NSVContext *nsv = s->priv_data;
279
    ByteIOContext *pb = s->pb;
280
    unsigned int file_size, size;
281
    int64_t duration;
282
    int strings_size;
283
    int table_entries;
284
    int table_entries_used;
285

    
286
    PRINT(("%s()\n", __FUNCTION__));
287

    
288
    nsv->state = NSV_UNSYNC; /* in case we fail */
289

    
290
    size = get_le32(pb);
291
    if (size < 28)
292
        return -1;
293
    nsv->NSVf_end = size;
294

    
295
    //s->file_size = (uint32_t)get_le32(pb);
296
    file_size = (uint32_t)get_le32(pb);
297
    PRINT(("NSV NSVf chunk_size %u\n", size));
298
    PRINT(("NSV NSVf file_size %u\n", file_size));
299

    
300
    nsv->duration = duration = get_le32(pb); /* in ms */
301
    PRINT(("NSV NSVf duration %"PRId64" ms\n", duration));
302
    // XXX: store it in AVStreams
303

    
304
    strings_size = get_le32(pb);
305
    table_entries = get_le32(pb);
306
    table_entries_used = get_le32(pb);
307
    PRINT(("NSV NSVf info-strings size: %d, table entries: %d, bis %d\n",
308
            strings_size, table_entries, table_entries_used));
309
    if (url_feof(pb))
310
        return -1;
311

    
312
    PRINT(("NSV got header; filepos %"PRId64"\n", url_ftell(pb)));
313

    
314
    if (strings_size > 0) {
315
        char *strings; /* last byte will be '\0' to play safe with str*() */
316
        char *p, *endp;
317
        char *token, *value;
318
        char quote;
319

    
320
        p = strings = av_mallocz(strings_size + 1);
321
        endp = strings + strings_size;
322
        get_buffer(pb, strings, strings_size);
323
        while (p < endp) {
324
            while (*p == ' ')
325
                p++; /* strip out spaces */
326
            if (p >= endp-2)
327
                break;
328
            token = p;
329
            p = strchr(p, '=');
330
            if (!p || p >= endp-2)
331
                break;
332
            *p++ = '\0';
333
            quote = *p++;
334
            value = p;
335
            p = strchr(p, quote);
336
            if (!p || p >= endp)
337
                break;
338
            *p++ = '\0';
339
            PRINT(("NSV NSVf INFO: %s='%s'\n", token, value));
340
            if (!strcmp(token, "ASPECT")) {
341
                /* don't care */
342
            } else if (!strcmp(token, "CREATOR") || !strcmp(token, "Author")) {
343
                strncpy(s->author, value, 512-1);
344
            } else if (!strcmp(token, "Copyright")) {
345
                strncpy(s->copyright, value, 512-1);
346
            } else if (!strcmp(token, "TITLE") || !strcmp(token, "Title")) {
347
                strncpy(s->title, value, 512-1);
348
            }
349
        }
350
        av_free(strings);
351
    }
352
    if (url_feof(pb))
353
        return -1;
354

    
355
    PRINT(("NSV got infos; filepos %"PRId64"\n", url_ftell(pb)));
356

    
357
    if (table_entries_used > 0) {
358
        nsv->index_entries = table_entries_used;
359
        if((unsigned)table_entries >= UINT_MAX / sizeof(uint32_t))
360
            return -1;
361
        nsv->nsvf_index_data = av_malloc(table_entries * sizeof(uint32_t));
362
#warning "FIXME: Byteswap buffer as needed"
363
        get_buffer(pb, (unsigned char *)nsv->nsvf_index_data, table_entries * sizeof(uint32_t));
364
    }
365

    
366
    PRINT(("NSV got index; filepos %"PRId64"\n", url_ftell(pb)));
367

    
368
#ifdef DEBUG_DUMP_INDEX
369
#define V(v) ((v<0x20 || v > 127)?'.':v)
370
    /* dump index */
371
    PRINT(("NSV %d INDEX ENTRIES:\n", table_entries));
372
    PRINT(("NSV [dataoffset][fileoffset]\n", table_entries));
373
    for (i = 0; i < table_entries; i++) {
374
        unsigned char b[8];
375
        url_fseek(pb, size + nsv->nsvf_index_data[i], SEEK_SET);
376
        get_buffer(pb, b, 8);
377
        PRINT(("NSV [0x%08lx][0x%08lx]: %02x %02x %02x %02x %02x %02x %02x %02x"
378
           "%c%c%c%c%c%c%c%c\n",
379
           nsv->nsvf_index_data[i], size + nsv->nsvf_index_data[i],
380
           b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7],
381
           V(b[0]), V(b[1]), V(b[2]), V(b[3]), V(b[4]), V(b[5]), V(b[6]), V(b[7]) ));
382
    }
383
    //url_fseek(pb, size, SEEK_SET); /* go back to end of header */
384
#undef V
385
#endif
386

    
387
    url_fseek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */
388

    
389
    if (url_feof(pb))
390
        return -1;
391
    nsv->state = NSV_HAS_READ_NSVF;
392
    return 0;
393
}
394

    
395
static int nsv_parse_NSVs_header(AVFormatContext *s, AVFormatParameters *ap)
396
{
397
    NSVContext *nsv = s->priv_data;
398
    ByteIOContext *pb = s->pb;
399
    uint32_t vtag, atag;
400
    uint16_t vwidth, vheight;
401
    AVRational framerate;
402
    int i;
403
    AVStream *st;
404
    NSVStream *nst;
405
    PRINT(("%s()\n", __FUNCTION__));
406

    
407
    vtag = get_le32(pb);
408
    atag = get_le32(pb);
409
    vwidth = get_le16(pb);
410
    vheight = get_le16(pb);
411
    i = get_byte(pb);
412

    
413
    PRINT(("NSV NSVs framerate code %2x\n", i));
414
    if(i&0x80) { /* odd way of giving native framerates from docs */
415
        int t=(i & 0x7F)>>2;
416
        if(t<16) framerate = (AVRational){1, t+1};
417
        else     framerate = (AVRational){t-15, 1};
418

    
419
        if(i&1){
420
            framerate.num *= 1000;
421
            framerate.den *= 1001;
422
        }
423

    
424
        if((i&3)==3)      framerate.num *= 24;
425
        else if((i&3)==2) framerate.num *= 25;
426
        else              framerate.num *= 30;
427
    }
428
    else
429
        framerate= (AVRational){i, 1};
430

    
431
    nsv->avsync = get_le16(pb);
432
    nsv->framerate = framerate;
433
#ifdef DEBUG
434
    print_tag("NSV NSVs vtag", vtag, 0);
435
    print_tag("NSV NSVs atag", atag, 0);
436
    PRINT(("NSV NSVs vsize %dx%d\n", vwidth, vheight));
437
#endif
438

    
439
    /* XXX change to ap != NULL ? */
440
    if (s->nb_streams == 0) { /* streams not yet published, let's do that */
441
        nsv->vtag = vtag;
442
        nsv->atag = atag;
443
        nsv->vwidth = vwidth;
444
        nsv->vheight = vwidth;
445
        if (vtag != T_NONE) {
446
            st = av_new_stream(s, NSV_ST_VIDEO);
447
            if (!st)
448
                goto fail;
449

    
450
            nst = av_mallocz(sizeof(NSVStream));
451
            if (!nst)
452
                goto fail;
453
            st->priv_data = nst;
454
            st->codec->codec_type = CODEC_TYPE_VIDEO;
455
            st->codec->codec_tag = vtag;
456
            st->codec->codec_id = codec_get_id(nsv_codec_video_tags, vtag);
457
            st->codec->width = vwidth;
458
            st->codec->height = vheight;
459
            st->codec->bits_per_coded_sample = 24; /* depth XXX */
460

    
461
            av_set_pts_info(st, 64, framerate.den, framerate.num);
462
            st->start_time = 0;
463
            st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den);
464
        }
465
        if (atag != T_NONE) {
466
#ifndef DISABLE_AUDIO
467
            st = av_new_stream(s, NSV_ST_AUDIO);
468
            if (!st)
469
                goto fail;
470

    
471
            nst = av_mallocz(sizeof(NSVStream));
472
            if (!nst)
473
                goto fail;
474
            st->priv_data = nst;
475
            st->codec->codec_type = CODEC_TYPE_AUDIO;
476
            st->codec->codec_tag = atag;
477
            st->codec->codec_id = codec_get_id(nsv_codec_audio_tags, atag);
478

    
479
            st->need_parsing = AVSTREAM_PARSE_FULL; /* for PCM we will read a chunk later and put correct info */
480

    
481
            /* set timebase to common denominator of ms and framerate */
482
            av_set_pts_info(st, 64, 1, framerate.num*1000);
483
            st->start_time = 0;
484
            st->duration = (int64_t)nsv->duration * framerate.num;
485
#endif
486
        }
487
#ifdef CHECK_SUBSEQUENT_NSVS
488
    } else {
489
        if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) {
490
            PRINT(("NSV NSVs header values differ from the first one!!!\n"));
491
            //return -1;
492
        }
493
#endif /* CHECK_SUBSEQUENT_NSVS */
494
    }
495

    
496
    nsv->state = NSV_HAS_READ_NSVS;
497
    return 0;
498
fail:
499
    /* XXX */
500
    nsv->state = NSV_UNSYNC;
501
    return -1;
502
}
503

    
504
static int nsv_read_header(AVFormatContext *s, AVFormatParameters *ap)
505
{
506
    NSVContext *nsv = s->priv_data;
507
    int i, err;
508

    
509
    PRINT(("%s()\n", __FUNCTION__));
510
    PRINT(("filename '%s'\n", s->filename));
511

    
512
    nsv->state = NSV_UNSYNC;
513
    nsv->ahead[0].data = nsv->ahead[1].data = NULL;
514

    
515
    for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
516
        if (nsv_resync(s) < 0)
517
            return -1;
518
        if (nsv->state == NSV_FOUND_NSVF)
519
            err = nsv_parse_NSVf_header(s, ap);
520
            /* we need the first NSVs also... */
521
        if (nsv->state == NSV_FOUND_NSVS) {
522
            err = nsv_parse_NSVs_header(s, ap);
523
            break; /* we just want the first one */
524
        }
525
    }
526
    if (s->nb_streams < 1) /* no luck so far */
527
        return -1;
528
    /* now read the first chunk, so we can attempt to decode more info */
529
    err = nsv_read_chunk(s, 1);
530

    
531
    PRINT(("parsed header\n"));
532
    return 0;
533
}
534

    
535
static int nsv_read_chunk(AVFormatContext *s, int fill_header)
536
{
537
    NSVContext *nsv = s->priv_data;
538
    ByteIOContext *pb = s->pb;
539
    AVStream *st[2] = {NULL, NULL};
540
    NSVStream *nst;
541
    AVPacket *pkt;
542
    int i, err = 0;
543
    uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */
544
    uint32_t vsize;
545
    uint16_t asize;
546
    uint16_t auxsize;
547
    uint32_t auxtag;
548

    
549
    PRINT(("%s(%d)\n", __FUNCTION__, fill_header));
550

    
551
    if (nsv->ahead[0].data || nsv->ahead[1].data)
552
        return 0; //-1; /* hey! eat what you've in your plate first! */
553

    
554
null_chunk_retry:
555
    if (url_feof(pb))
556
        return -1;
557

    
558
    for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++)
559
        err = nsv_resync(s);
560
    if (err < 0)
561
        return err;
562
    if (nsv->state == NSV_FOUND_NSVS)
563
        err = nsv_parse_NSVs_header(s, NULL);
564
    if (err < 0)
565
        return err;
566
    if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF)
567
        return -1;
568

    
569
    auxcount = get_byte(pb);
570
    vsize = get_le16(pb);
571
    asize = get_le16(pb);
572
    vsize = (vsize << 4) | (auxcount >> 4);
573
    auxcount &= 0x0f;
574
    PRINT(("NSV CHUNK %d aux, %u bytes video, %d bytes audio\n", auxcount, vsize, asize));
575
    /* skip aux stuff */
576
    for (i = 0; i < auxcount; i++) {
577
        auxsize = get_le16(pb);
578
        auxtag = get_le32(pb);
579
        PRINT(("NSV aux data: '%c%c%c%c', %d bytes\n",
580
              (auxtag & 0x0ff),
581
              ((auxtag >> 8) & 0x0ff),
582
              ((auxtag >> 16) & 0x0ff),
583
              ((auxtag >> 24) & 0x0ff),
584
              auxsize));
585
        url_fskip(pb, auxsize);
586
        vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming braindead */
587
    }
588

    
589
    if (url_feof(pb))
590
        return -1;
591
    if (!vsize && !asize) {
592
        nsv->state = NSV_UNSYNC;
593
        goto null_chunk_retry;
594
    }
595

    
596
    /* map back streams to v,a */
597
    if (s->streams[0])
598
        st[s->streams[0]->id] = s->streams[0];
599
    if (s->streams[1])
600
        st[s->streams[1]->id] = s->streams[1];
601

    
602
    if (vsize/* && st[NSV_ST_VIDEO]*/) {
603
        nst = st[NSV_ST_VIDEO]->priv_data;
604
        pkt = &nsv->ahead[NSV_ST_VIDEO];
605
        av_get_packet(pb, pkt, vsize);
606
        pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO;
607
        pkt->dts = nst->frame_offset;
608
        pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
609
/*
610
        for (i = 0; i < MIN(8, vsize); i++)
611
            PRINT(("NSV video: [%d] = %02x\n", i, pkt->data[i]));
612
*/
613
    }
614
    if(st[NSV_ST_VIDEO])
615
        ((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset++;
616

    
617
    if (asize/*st[NSV_ST_AUDIO]*/) {
618
        nst = st[NSV_ST_AUDIO]->priv_data;
619
        pkt = &nsv->ahead[NSV_ST_AUDIO];
620
        /* read raw audio specific header on the first audio chunk... */
621
        /* on ALL audio chunks ?? seems so! */
622
        if (asize && st[NSV_ST_AUDIO]->codec->codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) {
623
            uint8_t bps;
624
            uint8_t channels;
625
            uint16_t samplerate;
626
            bps = get_byte(pb);
627
            channels = get_byte(pb);
628
            samplerate = get_le16(pb);
629
            asize-=4;
630
            PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate));
631
            if (fill_header) {
632
                st[NSV_ST_AUDIO]->need_parsing = AVSTREAM_PARSE_NONE; /* we know everything */
633
                if (bps != 16) {
634
                    PRINT(("NSV AUDIO bit/sample != 16 (%d)!!!\n", bps));
635
                }
636
                bps /= channels; // ???
637
                if (bps == 8)
638
                    st[NSV_ST_AUDIO]->codec->codec_id = CODEC_ID_PCM_U8;
639
                samplerate /= 4;/* UGH ??? XXX */
640
                channels = 1;
641
                st[NSV_ST_AUDIO]->codec->channels = channels;
642
                st[NSV_ST_AUDIO]->codec->sample_rate = samplerate;
643
                PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate));
644
            }
645
        }
646
        av_get_packet(pb, pkt, asize);
647
        pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO;
648
        pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
649
        if( nsv->state == NSV_HAS_READ_NSVS && st[NSV_ST_VIDEO] ) {
650
            /* on a nsvs frame we have new information on a/v sync */
651
            pkt->dts = (((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset-1);
652
            pkt->dts *= (int64_t)1000        * nsv->framerate.den;
653
            pkt->dts += (int64_t)nsv->avsync * nsv->framerate.num;
654
            PRINT(("NSV AUDIO: sync:%d, dts:%"PRId64, nsv->avsync, pkt->dts));
655
        }
656
        nst->frame_offset++;
657
    }
658

    
659
    nsv->state = NSV_UNSYNC;
660
    return 0;
661
}
662

    
663

    
664
static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
665
{
666
    NSVContext *nsv = s->priv_data;
667
    int i, err = 0;
668

    
669
    PRINT(("%s()\n", __FUNCTION__));
670

    
671
    /* in case we don't already have something to eat ... */
672
    if (nsv->ahead[0].data == NULL && nsv->ahead[1].data == NULL)
673
        err = nsv_read_chunk(s, 0);
674
    if (err < 0)
675
        return err;
676

    
677
    /* now pick one of the plates */
678
    for (i = 0; i < 2; i++) {
679
        if (nsv->ahead[i].data) {
680
                PRINT(("%s: using cached packet[%d]\n", __FUNCTION__, i));
681
            /* avoid the cost of new_packet + memcpy(->data) */
682
            memcpy(pkt, &nsv->ahead[i], sizeof(AVPacket));
683
            nsv->ahead[i].data = NULL; /* we ate that one */
684
            return pkt->size;
685
        }
686
    }
687

    
688
    /* this restaurant is not approvisionned :^] */
689
    return -1;
690
}
691

    
692
static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
693
{
694
#if 0
695
    NSVContext *avi = s->priv_data;
696
    AVStream *st;
697
    NSVStream *ast;
698
    int frame_number, i;
699
    int64_t pos;
700
#endif
701

    
702
    return -1;
703
}
704

    
705
static int nsv_read_close(AVFormatContext *s)
706
{
707
/*     int i; */
708
    NSVContext *nsv = s->priv_data;
709

    
710
    if (nsv->index_entries)
711
        av_free(nsv->nsvf_index_data);
712

    
713
#if 0
714

715
    for(i=0;i<s->nb_streams;i++) {
716
        AVStream *st = s->streams[i];
717
        NSVStream *ast = st->priv_data;
718
        if(ast){
719
            av_free(ast->index_entries);
720
            av_free(ast);
721
        }
722
        av_free(st->codec->palctrl);
723
    }
724

725
#endif
726
    return 0;
727
}
728

    
729
static int nsv_probe(AVProbeData *p)
730
{
731
    int i;
732
//    PRINT(("nsv_probe(), buf_size %d\n", p->buf_size));
733
    /* check file header */
734
    /* streamed files might not have any header */
735
    if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
736
        p->buf[2] == 'V' && (p->buf[3] == 'f' || p->buf[3] == 's'))
737
        return AVPROBE_SCORE_MAX;
738
    /* XXX: do streamed files always start at chunk boundary ?? */
739
    /* or do we need to search NSVs in the byte stream ? */
740
    /* seems the servers don't bother starting clean chunks... */
741
    /* sometimes even the first header is at 9KB or something :^) */
742
    for (i = 1; i < p->buf_size - 3; i++) {
743
        if (p->buf[i+0] == 'N' && p->buf[i+1] == 'S' &&
744
            p->buf[i+2] == 'V' && p->buf[i+3] == 's')
745
            return AVPROBE_SCORE_MAX-20;
746
    }
747
    /* so we'll have more luck on extension... */
748
    if (match_ext(p->filename, "nsv"))
749
        return AVPROBE_SCORE_MAX/2;
750
    /* FIXME: add mime-type check */
751
    return 0;
752
}
753

    
754
AVInputFormat nsv_demuxer = {
755
    "nsv",
756
    NULL_IF_CONFIG_SMALL("NullSoft Video format"),
757
    sizeof(NSVContext),
758
    nsv_probe,
759
    nsv_read_header,
760
    nsv_read_packet,
761
    nsv_read_close,
762
    nsv_read_seek,
763
};