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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
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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 */
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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

    
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.
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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
 *
72
 * 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
74
 */
75

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

    
84
#if 0
85
struct NSVf_header {
86
    uint32_t chunk_tag; /* 'NSVf' */
87
    uint32_t chunk_size;
88
    uint32_t file_size; /* max 4GB ??? no one learns anything it seems :^) */
89
    uint32_t file_length; //unknown1;  /* what about MSB of file_size ? */
90
    uint32_t info_strings_size; /* size of the info strings */ //unknown2;
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    uint32_t table_entries;
92
    uint32_t table_entries_used; /* the left ones should be -1 */
93
};
94

95
struct NSVs_header {
96
    uint32_t chunk_tag; /* 'NSVs' */
97
    uint32_t v4cc;      /* or 'NONE' */
98
    uint32_t a4cc;      /* or 'NONE' */
99
    uint16_t vwidth;    /* assert(vwidth%16==0) */
100
    uint16_t vheight;   /* assert(vheight%16==0) */
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    uint8_t framerate;  /* value = (framerate&0x80)?frtable[frameratex0x7f]:framerate */
102
    uint16_t unknown;
103
};
104

105
struct nsv_avchunk_header {
106
    uint8_t vchunk_size_lsb;
107
    uint16_t vchunk_size_msb; /* value = (vchunk_size_msb << 4) | (vchunk_size_lsb >> 4) */
108
    uint16_t achunk_size;
109
};
110

111
struct nsv_pcm_header {
112
    uint8_t bits_per_sample;
113
    uint8_t channel_count;
114
    uint16_t sample_rate;
115
};
116
#endif
117

    
118
/* variation from avi.h */
119
/*typedef struct CodecTag {
120
    int id;
121
    unsigned int tag;
122
} CodecTag;*/
123

    
124
/* tags */
125

    
126
#define T_NSVF MKTAG('N', 'S', 'V', 'f') /* file header */
127
#define T_NSVS MKTAG('N', 'S', 'V', 's') /* chunk header */
128
#define T_TOC2 MKTAG('T', 'O', 'C', '2') /* extra index marker */
129
#define T_NONE MKTAG('N', 'O', 'N', 'E') /* null a/v 4CC */
130
#define T_SUBT MKTAG('S', 'U', 'B', 'T') /* subtitle aux data */
131
#define T_ASYN MKTAG('A', 'S', 'Y', 'N') /* async a/v aux marker */
132
#define T_KEYF MKTAG('K', 'E', 'Y', 'F') /* video keyframe aux marker (addition) */
133

    
134
#define TB_NSVF MKBETAG('N', 'S', 'V', 'f')
135
#define TB_NSVS MKBETAG('N', 'S', 'V', 's')
136

    
137
/* hardcoded stream indexes */
138
#define NSV_ST_VIDEO 0
139
#define NSV_ST_AUDIO 1
140
#define NSV_ST_SUBT 2
141

    
142
enum NSVStatus {
143
    NSV_UNSYNC,
144
    NSV_FOUND_NSVF,
145
    NSV_HAS_READ_NSVF,
146
    NSV_FOUND_NSVS,
147
    NSV_HAS_READ_NSVS,
148
    NSV_FOUND_BEEF,
149
    NSV_GOT_VIDEO,
150
    NSV_GOT_AUDIO,
151
};
152

    
153
typedef struct NSVStream {
154
    int frame_offset; /* current frame (video) or byte (audio) counter
155
                         (used to compute the pts) */
156
    int scale;
157
    int rate;
158
    int sample_size; /* audio only data */
159
    int start;
160

    
161
    int new_frame_offset; /* temporary storage (used during seek) */
162
    int cum_len; /* temporary storage (used during seek) */
163
} NSVStream;
164

    
165
typedef struct {
166
    int  base_offset;
167
    int  NSVf_end;
168
    uint32_t *nsvs_file_offset;
169
    int index_entries;
170
    enum NSVStatus state;
171
    AVPacket ahead[2]; /* [v, a] if .data is !NULL there is something */
172
    /* cached */
173
    int64_t duration;
174
    uint32_t vtag, atag;
175
    uint16_t vwidth, vheight;
176
    int16_t avsync;
177
    AVRational framerate;
178
    uint32_t *nsvs_timestamps;
179
    //DVDemuxContext* dv_demux;
180
} NSVContext;
181

    
182
static const AVCodecTag nsv_codec_video_tags[] = {
183
    { CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') },
184
    { CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
185
    { CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
186
    { CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') },
187
    { CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
188
    { CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') },
189
    { CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') },
190
    { CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') },
191
    { CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
192
/*
193
    { CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') },
194
    { CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') },
195
*/
196
    { CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */
197
    { CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') },
198
    { CODEC_ID_NONE, 0 },
199
};
200

    
201
static const AVCodecTag nsv_codec_audio_tags[] = {
202
    { CODEC_ID_MP3,       MKTAG('M', 'P', '3', ' ') },
203
    { CODEC_ID_AAC,       MKTAG('A', 'A', 'C', ' ') },
204
    { CODEC_ID_AAC,       MKTAG('A', 'A', 'C', 'P') },
205
    { CODEC_ID_SPEEX,     MKTAG('S', 'P', 'X', ' ') },
206
    { CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') },
207
    { CODEC_ID_NONE,      0 },
208
};
209

    
210
//static int nsv_load_index(AVFormatContext *s);
211
static int nsv_read_chunk(AVFormatContext *s, int fill_header);
212

    
213
#define print_tag(str, tag, size)       \
214
    av_dlog(NULL, "%s: tag=%c%c%c%c\n", \
215
            str, tag & 0xff,            \
216
            (tag >> 8) & 0xff,          \
217
            (tag >> 16) & 0xff,         \
218
            (tag >> 24) & 0xff);
219

    
220
/* try to find something we recognize, and set the state accordingly */
221
static int nsv_resync(AVFormatContext *s)
222
{
223
    NSVContext *nsv = s->priv_data;
224
    AVIOContext *pb = s->pb;
225
    uint32_t v = 0;
226
    int i;
227

    
228
    av_dlog(s, "%s(), offset = %"PRId64", state = %d\n", __FUNCTION__, url_ftell(pb), nsv->state);
229

    
230
    //nsv->state = NSV_UNSYNC;
231

    
232
    for (i = 0; i < NSV_MAX_RESYNC; i++) {
233
        if (url_feof(pb)) {
234
            av_dlog(s, "NSV EOF\n");
235
            nsv->state = NSV_UNSYNC;
236
            return -1;
237
        }
238
        v <<= 8;
239
        v |= avio_r8(pb);
240
        if (i < 8) {
241
            av_dlog(s, "NSV resync: [%d] = %02x\n", i, v & 0x0FF);
242
        }
243

    
244
        if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */
245
            av_dlog(s, "NSV resynced on BEEF after %d bytes\n", i+1);
246
            nsv->state = NSV_FOUND_BEEF;
247
            return 0;
248
        }
249
        /* we read as big endian, thus the MK*BE* */
250
        if (v == TB_NSVF) { /* NSVf */
251
            av_dlog(s, "NSV resynced on NSVf after %d bytes\n", i+1);
252
            nsv->state = NSV_FOUND_NSVF;
253
            return 0;
254
        }
255
        if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */
256
            av_dlog(s, "NSV resynced on NSVs after %d bytes\n", i+1);
257
            nsv->state = NSV_FOUND_NSVS;
258
            return 0;
259
        }
260

    
261
    }
262
    av_dlog(s, "NSV sync lost\n");
263
    return -1;
264
}
265

    
266
static int nsv_parse_NSVf_header(AVFormatContext *s, AVFormatParameters *ap)
267
{
268
    NSVContext *nsv = s->priv_data;
269
    AVIOContext *pb = s->pb;
270
    unsigned int file_size, size;
271
    int64_t duration;
272
    int strings_size;
273
    int table_entries;
274
    int table_entries_used;
275

    
276
    av_dlog(s, "%s()\n", __FUNCTION__);
277

    
278
    nsv->state = NSV_UNSYNC; /* in case we fail */
279

    
280
    size = avio_rl32(pb);
281
    if (size < 28)
282
        return -1;
283
    nsv->NSVf_end = size;
284

    
285
    //s->file_size = (uint32_t)avio_rl32(pb);
286
    file_size = (uint32_t)avio_rl32(pb);
287
    av_dlog(s, "NSV NSVf chunk_size %u\n", size);
288
    av_dlog(s, "NSV NSVf file_size %u\n", file_size);
289

    
290
    nsv->duration = duration = avio_rl32(pb); /* in ms */
291
    av_dlog(s, "NSV NSVf duration %"PRId64" ms\n", duration);
292
    // XXX: store it in AVStreams
293

    
294
    strings_size = avio_rl32(pb);
295
    table_entries = avio_rl32(pb);
296
    table_entries_used = avio_rl32(pb);
297
    av_dlog(s, "NSV NSVf info-strings size: %d, table entries: %d, bis %d\n",
298
            strings_size, table_entries, table_entries_used);
299
    if (url_feof(pb))
300
        return -1;
301

    
302
    av_dlog(s, "NSV got header; filepos %"PRId64"\n", url_ftell(pb));
303

    
304
    if (strings_size > 0) {
305
        char *strings; /* last byte will be '\0' to play safe with str*() */
306
        char *p, *endp;
307
        char *token, *value;
308
        char quote;
309

    
310
        p = strings = av_mallocz(strings_size + 1);
311
        endp = strings + strings_size;
312
        avio_read(pb, strings, strings_size);
313
        while (p < endp) {
314
            while (*p == ' ')
315
                p++; /* strip out spaces */
316
            if (p >= endp-2)
317
                break;
318
            token = p;
319
            p = strchr(p, '=');
320
            if (!p || p >= endp-2)
321
                break;
322
            *p++ = '\0';
323
            quote = *p++;
324
            value = p;
325
            p = strchr(p, quote);
326
            if (!p || p >= endp)
327
                break;
328
            *p++ = '\0';
329
            av_dlog(s, "NSV NSVf INFO: %s='%s'\n", token, value);
330
            av_metadata_set2(&s->metadata, token, value, 0);
331
        }
332
        av_free(strings);
333
    }
334
    if (url_feof(pb))
335
        return -1;
336

    
337
    av_dlog(s, "NSV got infos; filepos %"PRId64"\n", url_ftell(pb));
338

    
339
    if (table_entries_used > 0) {
340
        int i;
341
        nsv->index_entries = table_entries_used;
342
        if((unsigned)table_entries_used >= UINT_MAX / sizeof(uint32_t))
343
            return -1;
344
        nsv->nsvs_file_offset = av_malloc((unsigned)table_entries_used * sizeof(uint32_t));
345

    
346
        for(i=0;i<table_entries_used;i++)
347
            nsv->nsvs_file_offset[i] = avio_rl32(pb) + size;
348

    
349
        if(table_entries > table_entries_used &&
350
           avio_rl32(pb) == MKTAG('T','O','C','2')) {
351
            nsv->nsvs_timestamps = av_malloc((unsigned)table_entries_used*sizeof(uint32_t));
352
            for(i=0;i<table_entries_used;i++) {
353
                nsv->nsvs_timestamps[i] = avio_rl32(pb);
354
            }
355
        }
356
    }
357

    
358
    av_dlog(s, "NSV got index; filepos %"PRId64"\n", url_ftell(pb));
359

    
360
#ifdef DEBUG_DUMP_INDEX
361
#define V(v) ((v<0x20 || v > 127)?'.':v)
362
    /* dump index */
363
    av_dlog(s, "NSV %d INDEX ENTRIES:\n", table_entries);
364
    av_dlog(s, "NSV [dataoffset][fileoffset]\n", table_entries);
365
    for (i = 0; i < table_entries; i++) {
366
        unsigned char b[8];
367
        url_fseek(pb, size + nsv->nsvs_file_offset[i], SEEK_SET);
368
        avio_read(pb, b, 8);
369
        av_dlog(s, "NSV [0x%08lx][0x%08lx]: %02x %02x %02x %02x %02x %02x %02x %02x"
370
           "%c%c%c%c%c%c%c%c\n",
371
           nsv->nsvs_file_offset[i], size + nsv->nsvs_file_offset[i],
372
           b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7],
373
           V(b[0]), V(b[1]), V(b[2]), V(b[3]), V(b[4]), V(b[5]), V(b[6]), V(b[7]) );
374
    }
375
    //url_fseek(pb, size, SEEK_SET); /* go back to end of header */
376
#undef V
377
#endif
378

    
379
    url_fseek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */
380

    
381
    if (url_feof(pb))
382
        return -1;
383
    nsv->state = NSV_HAS_READ_NSVF;
384
    return 0;
385
}
386

    
387
static int nsv_parse_NSVs_header(AVFormatContext *s, AVFormatParameters *ap)
388
{
389
    NSVContext *nsv = s->priv_data;
390
    AVIOContext *pb = s->pb;
391
    uint32_t vtag, atag;
392
    uint16_t vwidth, vheight;
393
    AVRational framerate;
394
    int i;
395
    AVStream *st;
396
    NSVStream *nst;
397
    av_dlog(s, "%s()\n", __FUNCTION__);
398

    
399
    vtag = avio_rl32(pb);
400
    atag = avio_rl32(pb);
401
    vwidth = avio_rl16(pb);
402
    vheight = avio_rl16(pb);
403
    i = avio_r8(pb);
404

    
405
    av_dlog(s, "NSV NSVs framerate code %2x\n", i);
406
    if(i&0x80) { /* odd way of giving native framerates from docs */
407
        int t=(i & 0x7F)>>2;
408
        if(t<16) framerate = (AVRational){1, t+1};
409
        else     framerate = (AVRational){t-15, 1};
410

    
411
        if(i&1){
412
            framerate.num *= 1000;
413
            framerate.den *= 1001;
414
        }
415

    
416
        if((i&3)==3)      framerate.num *= 24;
417
        else if((i&3)==2) framerate.num *= 25;
418
        else              framerate.num *= 30;
419
    }
420
    else
421
        framerate= (AVRational){i, 1};
422

    
423
    nsv->avsync = avio_rl16(pb);
424
    nsv->framerate = framerate;
425

    
426
    print_tag("NSV NSVs vtag", vtag, 0);
427
    print_tag("NSV NSVs atag", atag, 0);
428
    av_dlog(s, "NSV NSVs vsize %dx%d\n", vwidth, vheight);
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
            int i;
438
            st = av_new_stream(s, NSV_ST_VIDEO);
439
            if (!st)
440
                goto fail;
441

    
442
            nst = av_mallocz(sizeof(NSVStream));
443
            if (!nst)
444
                goto fail;
445
            st->priv_data = nst;
446
            st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
447
            st->codec->codec_tag = vtag;
448
            st->codec->codec_id = ff_codec_get_id(nsv_codec_video_tags, vtag);
449
            st->codec->width = vwidth;
450
            st->codec->height = vheight;
451
            st->codec->bits_per_coded_sample = 24; /* depth XXX */
452

    
453
            av_set_pts_info(st, 64, framerate.den, framerate.num);
454
            st->start_time = 0;
455
            st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den);
456

    
457
            for(i=0;i<nsv->index_entries;i++) {
458
                if(nsv->nsvs_timestamps) {
459
                    av_add_index_entry(st, nsv->nsvs_file_offset[i], nsv->nsvs_timestamps[i],
460
                                       0, 0, AVINDEX_KEYFRAME);
461
                } else {
462
                    int64_t ts = av_rescale(i*nsv->duration/nsv->index_entries, framerate.num, 1000*framerate.den);
463
                    av_add_index_entry(st, nsv->nsvs_file_offset[i], ts, 0, 0, AVINDEX_KEYFRAME);
464
                }
465
            }
466
        }
467
        if (atag != T_NONE) {
468
#ifndef DISABLE_AUDIO
469
            st = av_new_stream(s, NSV_ST_AUDIO);
470
            if (!st)
471
                goto fail;
472

    
473
            nst = av_mallocz(sizeof(NSVStream));
474
            if (!nst)
475
                goto fail;
476
            st->priv_data = nst;
477
            st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
478
            st->codec->codec_tag = atag;
479
            st->codec->codec_id = ff_codec_get_id(nsv_codec_audio_tags, atag);
480

    
481
            st->need_parsing = AVSTREAM_PARSE_FULL; /* for PCM we will read a chunk later and put correct info */
482

    
483
            /* set timebase to common denominator of ms and framerate */
484
            av_set_pts_info(st, 64, 1, framerate.num*1000);
485
            st->start_time = 0;
486
            st->duration = (int64_t)nsv->duration * framerate.num;
487
#endif
488
        }
489
#ifdef CHECK_SUBSEQUENT_NSVS
490
    } else {
491
        if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) {
492
            av_dlog(s, "NSV NSVs header values differ from the first one!!!\n");
493
            //return -1;
494
        }
495
#endif /* CHECK_SUBSEQUENT_NSVS */
496
    }
497

    
498
    nsv->state = NSV_HAS_READ_NSVS;
499
    return 0;
500
fail:
501
    /* XXX */
502
    nsv->state = NSV_UNSYNC;
503
    return -1;
504
}
505

    
506
static int nsv_read_header(AVFormatContext *s, AVFormatParameters *ap)
507
{
508
    NSVContext *nsv = s->priv_data;
509
    int i, err;
510

    
511
    av_dlog(s, "%s()\n", __FUNCTION__);
512
    av_dlog(s, "filename '%s'\n", s->filename);
513

    
514
    nsv->state = NSV_UNSYNC;
515
    nsv->ahead[0].data = nsv->ahead[1].data = NULL;
516

    
517
    for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
518
        if (nsv_resync(s) < 0)
519
            return -1;
520
        if (nsv->state == NSV_FOUND_NSVF)
521
            err = nsv_parse_NSVf_header(s, ap);
522
            /* we need the first NSVs also... */
523
        if (nsv->state == NSV_FOUND_NSVS) {
524
            err = nsv_parse_NSVs_header(s, ap);
525
            break; /* we just want the first one */
526
        }
527
    }
528
    if (s->nb_streams < 1) /* no luck so far */
529
        return -1;
530
    /* now read the first chunk, so we can attempt to decode more info */
531
    err = nsv_read_chunk(s, 1);
532

    
533
    av_dlog(s, "parsed header\n");
534
    return 0;
535
}
536

    
537
static int nsv_read_chunk(AVFormatContext *s, int fill_header)
538
{
539
    NSVContext *nsv = s->priv_data;
540
    AVIOContext *pb = s->pb;
541
    AVStream *st[2] = {NULL, NULL};
542
    NSVStream *nst;
543
    AVPacket *pkt;
544
    int i, err = 0;
545
    uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */
546
    uint32_t vsize;
547
    uint16_t asize;
548
    uint16_t auxsize;
549
    uint32_t auxtag;
550

    
551
    av_dlog(s, "%s(%d)\n", __FUNCTION__, fill_header);
552

    
553
    if (nsv->ahead[0].data || nsv->ahead[1].data)
554
        return 0; //-1; /* hey! eat what you've in your plate first! */
555

    
556
null_chunk_retry:
557
    if (url_feof(pb))
558
        return -1;
559

    
560
    for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++)
561
        err = nsv_resync(s);
562
    if (err < 0)
563
        return err;
564
    if (nsv->state == NSV_FOUND_NSVS)
565
        err = nsv_parse_NSVs_header(s, NULL);
566
    if (err < 0)
567
        return err;
568
    if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF)
569
        return -1;
570

    
571
    auxcount = avio_r8(pb);
572
    vsize = avio_rl16(pb);
573
    asize = avio_rl16(pb);
574
    vsize = (vsize << 4) | (auxcount >> 4);
575
    auxcount &= 0x0f;
576
    av_dlog(s, "NSV CHUNK %d aux, %u bytes video, %d bytes audio\n", auxcount, vsize, asize);
577
    /* skip aux stuff */
578
    for (i = 0; i < auxcount; i++) {
579
        auxsize = avio_rl16(pb);
580
        auxtag = avio_rl32(pb);
581
        av_dlog(s, "NSV aux data: '%c%c%c%c', %d bytes\n",
582
              (auxtag & 0x0ff),
583
              ((auxtag >> 8) & 0x0ff),
584
              ((auxtag >> 16) & 0x0ff),
585
              ((auxtag >> 24) & 0x0ff),
586
              auxsize);
587
        url_fskip(pb, auxsize);
588
        vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming braindead */
589
    }
590

    
591
    if (url_feof(pb))
592
        return -1;
593
    if (!vsize && !asize) {
594
        nsv->state = NSV_UNSYNC;
595
        goto null_chunk_retry;
596
    }
597

    
598
    /* map back streams to v,a */
599
    if (s->streams[0])
600
        st[s->streams[0]->id] = s->streams[0];
601
    if (s->streams[1])
602
        st[s->streams[1]->id] = s->streams[1];
603

    
604
    if (vsize/* && st[NSV_ST_VIDEO]*/) {
605
        nst = st[NSV_ST_VIDEO]->priv_data;
606
        pkt = &nsv->ahead[NSV_ST_VIDEO];
607
        av_get_packet(pb, pkt, vsize);
608
        pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO;
609
        pkt->dts = nst->frame_offset;
610
        pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
611
        for (i = 0; i < FFMIN(8, vsize); i++)
612
            av_dlog(s, "NSV video: [%d] = %02x\n", i, pkt->data[i]);
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 = avio_r8(pb);
627
            channels = avio_r8(pb);
628
            samplerate = avio_rl16(pb);
629
            asize-=4;
630
            av_dlog(s, "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
                    av_dlog(s, "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
                av_dlog(s, "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 ? AV_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
            av_dlog(s, "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
    av_dlog(s, "%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
            av_dlog(s, "%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
    NSVContext *nsv = s->priv_data;
695
    AVStream *st = s->streams[stream_index];
696
    NSVStream *nst = st->priv_data;
697
    int index;
698

    
699
    index = av_index_search_timestamp(st, timestamp, flags);
700
    if(index < 0)
701
        return -1;
702

    
703
    url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET);
704
    nst->frame_offset = st->index_entries[index].timestamp;
705
    nsv->state = NSV_UNSYNC;
706
    return 0;
707
}
708

    
709
static int nsv_read_close(AVFormatContext *s)
710
{
711
/*     int i; */
712
    NSVContext *nsv = s->priv_data;
713

    
714
    av_freep(&nsv->nsvs_file_offset);
715
    av_freep(&nsv->nsvs_timestamps);
716
    if (nsv->ahead[0].data)
717
        av_free_packet(&nsv->ahead[0]);
718
    if (nsv->ahead[1].data)
719
        av_free_packet(&nsv->ahead[1]);
720

    
721
#if 0
722

723
    for(i=0;i<s->nb_streams;i++) {
724
        AVStream *st = s->streams[i];
725
        NSVStream *ast = st->priv_data;
726
        if(ast){
727
            av_free(ast->index_entries);
728
            av_free(ast);
729
        }
730
        av_free(st->codec->palctrl);
731
    }
732

733
#endif
734
    return 0;
735
}
736

    
737
static int nsv_probe(AVProbeData *p)
738
{
739
    int i;
740
    av_dlog(NULL, "nsv_probe(), buf_size %d\n", p->buf_size);
741
    /* check file header */
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] == 'f' || 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 (av_match_ext(p->filename, "nsv"))
757
        return AVPROBE_SCORE_MAX/2;
758
    /* FIXME: add mime-type check */
759
    return 0;
760
}
761

    
762
AVInputFormat ff_nsv_demuxer = {
763
    "nsv",
764
    NULL_IF_CONFIG_SMALL("Nullsoft Streaming Video"),
765
    sizeof(NSVContext),
766
    nsv_probe,
767
    nsv_read_header,
768
    nsv_read_packet,
769
    nsv_read_close,
770
    nsv_read_seek,
771
};