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ffmpeg / libavformat / nsvdec.c @ 72415b2a

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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.
6
 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * 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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 */
21
#include "avformat.h"
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#include "riff.h"
23

    
24
//#define DEBUG
25
//#define DEBUG_DUMP_INDEX // XXX dumbdriving-271.nsv breaks with it commented!!
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//#define DEBUG_SEEK
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#define CHECK_SUBSEQUENT_NSVS
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//#define DISABLE_AUDIO
29

    
30
/* max bytes to crawl for trying to resync
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 * stupid streaming servers don't start at chunk boundaries...
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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
 *
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 * 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
#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 *nsvs_file_offset;
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
    uint32_t *nsvs_timestamps;
185
    //DVDemuxContext* dv_demux;
186
} NSVContext;
187

    
188
static const AVCodecTag nsv_codec_video_tags[] = {
189
    { CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') },
190
    { CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
191
    { CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
192
    { CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') },
193
    { CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
194
    { CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') },
195
    { CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') },
196
    { CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') },
197
    { CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
198
/*
199
    { CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') },
200
    { CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') },
201
*/
202
    { CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */
203
    { CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') },
204
    { CODEC_ID_NONE, 0 },
205
};
206

    
207
static const AVCodecTag nsv_codec_audio_tags[] = {
208
    { CODEC_ID_MP3,       MKTAG('M', 'P', '3', ' ') },
209
    { CODEC_ID_AAC,       MKTAG('A', 'A', 'C', ' ') },
210
    { CODEC_ID_AAC,       MKTAG('A', 'A', 'C', 'P') },
211
    { CODEC_ID_SPEEX,     MKTAG('S', 'P', 'X', ' ') },
212
    { CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') },
213
    { CODEC_ID_NONE,      0 },
214
};
215

    
216
//static int nsv_load_index(AVFormatContext *s);
217
static int nsv_read_chunk(AVFormatContext *s, int fill_header);
218

    
219
#ifdef DEBUG
220
static void print_tag(const char *str, unsigned int tag, int size)
221
{
222
    printf("%s: tag=%c%c%c%c\n",
223
           str, tag & 0xff,
224
           (tag >> 8) & 0xff,
225
           (tag >> 16) & 0xff,
226
           (tag >> 24) & 0xff);
227
}
228
#endif
229

    
230
/* try to find something we recognize, and set the state accordingly */
231
static int nsv_resync(AVFormatContext *s)
232
{
233
    NSVContext *nsv = s->priv_data;
234
    ByteIOContext *pb = s->pb;
235
    uint32_t v = 0;
236
    int i;
237

    
238
    PRINT(("%s(), offset = %"PRId64", state = %d\n", __FUNCTION__, url_ftell(pb), nsv->state));
239

    
240
    //nsv->state = NSV_UNSYNC;
241

    
242
    for (i = 0; i < NSV_MAX_RESYNC; i++) {
243
        if (url_feof(pb)) {
244
            PRINT(("NSV EOF\n"));
245
            nsv->state = NSV_UNSYNC;
246
            return -1;
247
        }
248
        v <<= 8;
249
        v |= get_byte(pb);
250
/*
251
        if (i < 8) {
252
            PRINT(("NSV resync: [%d] = %02x\n", i, v & 0x0FF));
253
        }
254
*/
255

    
256
        if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */
257
            PRINT(("NSV resynced on BEEF after %d bytes\n", i+1));
258
            nsv->state = NSV_FOUND_BEEF;
259
            return 0;
260
        }
261
        /* we read as big endian, thus the MK*BE* */
262
        if (v == TB_NSVF) { /* NSVf */
263
            PRINT(("NSV resynced on NSVf after %d bytes\n", i+1));
264
            nsv->state = NSV_FOUND_NSVF;
265
            return 0;
266
        }
267
        if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */
268
            PRINT(("NSV resynced on NSVs after %d bytes\n", i+1));
269
            nsv->state = NSV_FOUND_NSVS;
270
            return 0;
271
        }
272

    
273
    }
274
    PRINT(("NSV sync lost\n"));
275
    return -1;
276
}
277

    
278
static int nsv_parse_NSVf_header(AVFormatContext *s, AVFormatParameters *ap)
279
{
280
    NSVContext *nsv = s->priv_data;
281
    ByteIOContext *pb = s->pb;
282
    unsigned int file_size, size;
283
    int64_t duration;
284
    int strings_size;
285
    int table_entries;
286
    int table_entries_used;
287

    
288
    PRINT(("%s()\n", __FUNCTION__));
289

    
290
    nsv->state = NSV_UNSYNC; /* in case we fail */
291

    
292
    size = get_le32(pb);
293
    if (size < 28)
294
        return -1;
295
    nsv->NSVf_end = size;
296

    
297
    //s->file_size = (uint32_t)get_le32(pb);
298
    file_size = (uint32_t)get_le32(pb);
299
    PRINT(("NSV NSVf chunk_size %u\n", size));
300
    PRINT(("NSV NSVf file_size %u\n", file_size));
301

    
302
    nsv->duration = duration = get_le32(pb); /* in ms */
303
    PRINT(("NSV NSVf duration %"PRId64" ms\n", duration));
304
    // XXX: store it in AVStreams
305

    
306
    strings_size = get_le32(pb);
307
    table_entries = get_le32(pb);
308
    table_entries_used = get_le32(pb);
309
    PRINT(("NSV NSVf info-strings size: %d, table entries: %d, bis %d\n",
310
            strings_size, table_entries, table_entries_used));
311
    if (url_feof(pb))
312
        return -1;
313

    
314
    PRINT(("NSV got header; filepos %"PRId64"\n", url_ftell(pb)));
315

    
316
    if (strings_size > 0) {
317
        char *strings; /* last byte will be '\0' to play safe with str*() */
318
        char *p, *endp;
319
        char *token, *value;
320
        char quote;
321

    
322
        p = strings = av_mallocz(strings_size + 1);
323
        endp = strings + strings_size;
324
        get_buffer(pb, strings, strings_size);
325
        while (p < endp) {
326
            while (*p == ' ')
327
                p++; /* strip out spaces */
328
            if (p >= endp-2)
329
                break;
330
            token = p;
331
            p = strchr(p, '=');
332
            if (!p || p >= endp-2)
333
                break;
334
            *p++ = '\0';
335
            quote = *p++;
336
            value = p;
337
            p = strchr(p, quote);
338
            if (!p || p >= endp)
339
                break;
340
            *p++ = '\0';
341
            PRINT(("NSV NSVf INFO: %s='%s'\n", token, value));
342
            av_metadata_set(&s->metadata, token, value);
343
        }
344
        av_free(strings);
345
    }
346
    if (url_feof(pb))
347
        return -1;
348

    
349
    PRINT(("NSV got infos; filepos %"PRId64"\n", url_ftell(pb)));
350

    
351
    if (table_entries_used > 0) {
352
        int i;
353
        nsv->index_entries = table_entries_used;
354
        if((unsigned)table_entries_used >= UINT_MAX / sizeof(uint32_t))
355
            return -1;
356
        nsv->nsvs_file_offset = av_malloc((unsigned)table_entries_used * sizeof(uint32_t));
357

    
358
        for(i=0;i<table_entries_used;i++)
359
            nsv->nsvs_file_offset[i] = get_le32(pb) + size;
360

    
361
        if(table_entries > table_entries_used &&
362
           get_le32(pb) == MKTAG('T','O','C','2')) {
363
            nsv->nsvs_timestamps = av_malloc((unsigned)table_entries_used*sizeof(uint32_t));
364
            for(i=0;i<table_entries_used;i++) {
365
                nsv->nsvs_timestamps[i] = get_le32(pb);
366
            }
367
        }
368
    }
369

    
370
    PRINT(("NSV got index; filepos %"PRId64"\n", url_ftell(pb)));
371

    
372
#ifdef DEBUG_DUMP_INDEX
373
#define V(v) ((v<0x20 || v > 127)?'.':v)
374
    /* dump index */
375
    PRINT(("NSV %d INDEX ENTRIES:\n", table_entries));
376
    PRINT(("NSV [dataoffset][fileoffset]\n", table_entries));
377
    for (i = 0; i < table_entries; i++) {
378
        unsigned char b[8];
379
        url_fseek(pb, size + nsv->nsvs_file_offset[i], SEEK_SET);
380
        get_buffer(pb, b, 8);
381
        PRINT(("NSV [0x%08lx][0x%08lx]: %02x %02x %02x %02x %02x %02x %02x %02x"
382
           "%c%c%c%c%c%c%c%c\n",
383
           nsv->nsvs_file_offset[i], size + nsv->nsvs_file_offset[i],
384
           b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7],
385
           V(b[0]), V(b[1]), V(b[2]), V(b[3]), V(b[4]), V(b[5]), V(b[6]), V(b[7]) ));
386
    }
387
    //url_fseek(pb, size, SEEK_SET); /* go back to end of header */
388
#undef V
389
#endif
390

    
391
    url_fseek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */
392

    
393
    if (url_feof(pb))
394
        return -1;
395
    nsv->state = NSV_HAS_READ_NSVF;
396
    return 0;
397
}
398

    
399
static int nsv_parse_NSVs_header(AVFormatContext *s, AVFormatParameters *ap)
400
{
401
    NSVContext *nsv = s->priv_data;
402
    ByteIOContext *pb = s->pb;
403
    uint32_t vtag, atag;
404
    uint16_t vwidth, vheight;
405
    AVRational framerate;
406
    int i;
407
    AVStream *st;
408
    NSVStream *nst;
409
    PRINT(("%s()\n", __FUNCTION__));
410

    
411
    vtag = get_le32(pb);
412
    atag = get_le32(pb);
413
    vwidth = get_le16(pb);
414
    vheight = get_le16(pb);
415
    i = get_byte(pb);
416

    
417
    PRINT(("NSV NSVs framerate code %2x\n", i));
418
    if(i&0x80) { /* odd way of giving native framerates from docs */
419
        int t=(i & 0x7F)>>2;
420
        if(t<16) framerate = (AVRational){1, t+1};
421
        else     framerate = (AVRational){t-15, 1};
422

    
423
        if(i&1){
424
            framerate.num *= 1000;
425
            framerate.den *= 1001;
426
        }
427

    
428
        if((i&3)==3)      framerate.num *= 24;
429
        else if((i&3)==2) framerate.num *= 25;
430
        else              framerate.num *= 30;
431
    }
432
    else
433
        framerate= (AVRational){i, 1};
434

    
435
    nsv->avsync = get_le16(pb);
436
    nsv->framerate = framerate;
437
#ifdef DEBUG
438
    print_tag("NSV NSVs vtag", vtag, 0);
439
    print_tag("NSV NSVs atag", atag, 0);
440
    PRINT(("NSV NSVs vsize %dx%d\n", vwidth, vheight));
441
#endif
442

    
443
    /* XXX change to ap != NULL ? */
444
    if (s->nb_streams == 0) { /* streams not yet published, let's do that */
445
        nsv->vtag = vtag;
446
        nsv->atag = atag;
447
        nsv->vwidth = vwidth;
448
        nsv->vheight = vwidth;
449
        if (vtag != T_NONE) {
450
            int i;
451
            st = av_new_stream(s, NSV_ST_VIDEO);
452
            if (!st)
453
                goto fail;
454

    
455
            nst = av_mallocz(sizeof(NSVStream));
456
            if (!nst)
457
                goto fail;
458
            st->priv_data = nst;
459
            st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
460
            st->codec->codec_tag = vtag;
461
            st->codec->codec_id = ff_codec_get_id(nsv_codec_video_tags, vtag);
462
            st->codec->width = vwidth;
463
            st->codec->height = vheight;
464
            st->codec->bits_per_coded_sample = 24; /* depth XXX */
465

    
466
            av_set_pts_info(st, 64, framerate.den, framerate.num);
467
            st->start_time = 0;
468
            st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den);
469

    
470
            for(i=0;i<nsv->index_entries;i++) {
471
                if(nsv->nsvs_timestamps) {
472
                    av_add_index_entry(st, nsv->nsvs_file_offset[i], nsv->nsvs_timestamps[i],
473
                                       0, 0, AVINDEX_KEYFRAME);
474
                } else {
475
                    int64_t ts = av_rescale(i*nsv->duration/nsv->index_entries, framerate.num, 1000*framerate.den);
476
                    av_add_index_entry(st, nsv->nsvs_file_offset[i], ts, 0, 0, AVINDEX_KEYFRAME);
477
                }
478
            }
479
        }
480
        if (atag != T_NONE) {
481
#ifndef DISABLE_AUDIO
482
            st = av_new_stream(s, NSV_ST_AUDIO);
483
            if (!st)
484
                goto fail;
485

    
486
            nst = av_mallocz(sizeof(NSVStream));
487
            if (!nst)
488
                goto fail;
489
            st->priv_data = nst;
490
            st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
491
            st->codec->codec_tag = atag;
492
            st->codec->codec_id = ff_codec_get_id(nsv_codec_audio_tags, atag);
493

    
494
            st->need_parsing = AVSTREAM_PARSE_FULL; /* for PCM we will read a chunk later and put correct info */
495

    
496
            /* set timebase to common denominator of ms and framerate */
497
            av_set_pts_info(st, 64, 1, framerate.num*1000);
498
            st->start_time = 0;
499
            st->duration = (int64_t)nsv->duration * framerate.num;
500
#endif
501
        }
502
#ifdef CHECK_SUBSEQUENT_NSVS
503
    } else {
504
        if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) {
505
            PRINT(("NSV NSVs header values differ from the first one!!!\n"));
506
            //return -1;
507
        }
508
#endif /* CHECK_SUBSEQUENT_NSVS */
509
    }
510

    
511
    nsv->state = NSV_HAS_READ_NSVS;
512
    return 0;
513
fail:
514
    /* XXX */
515
    nsv->state = NSV_UNSYNC;
516
    return -1;
517
}
518

    
519
static int nsv_read_header(AVFormatContext *s, AVFormatParameters *ap)
520
{
521
    NSVContext *nsv = s->priv_data;
522
    int i, err;
523

    
524
    PRINT(("%s()\n", __FUNCTION__));
525
    PRINT(("filename '%s'\n", s->filename));
526

    
527
    nsv->state = NSV_UNSYNC;
528
    nsv->ahead[0].data = nsv->ahead[1].data = NULL;
529

    
530
    for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
531
        if (nsv_resync(s) < 0)
532
            return -1;
533
        if (nsv->state == NSV_FOUND_NSVF)
534
            err = nsv_parse_NSVf_header(s, ap);
535
            /* we need the first NSVs also... */
536
        if (nsv->state == NSV_FOUND_NSVS) {
537
            err = nsv_parse_NSVs_header(s, ap);
538
            break; /* we just want the first one */
539
        }
540
    }
541
    if (s->nb_streams < 1) /* no luck so far */
542
        return -1;
543
    /* now read the first chunk, so we can attempt to decode more info */
544
    err = nsv_read_chunk(s, 1);
545

    
546
    PRINT(("parsed header\n"));
547
    return 0;
548
}
549

    
550
static int nsv_read_chunk(AVFormatContext *s, int fill_header)
551
{
552
    NSVContext *nsv = s->priv_data;
553
    ByteIOContext *pb = s->pb;
554
    AVStream *st[2] = {NULL, NULL};
555
    NSVStream *nst;
556
    AVPacket *pkt;
557
    int i, err = 0;
558
    uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */
559
    uint32_t vsize;
560
    uint16_t asize;
561
    uint16_t auxsize;
562
    uint32_t auxtag;
563

    
564
    PRINT(("%s(%d)\n", __FUNCTION__, fill_header));
565

    
566
    if (nsv->ahead[0].data || nsv->ahead[1].data)
567
        return 0; //-1; /* hey! eat what you've in your plate first! */
568

    
569
null_chunk_retry:
570
    if (url_feof(pb))
571
        return -1;
572

    
573
    for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++)
574
        err = nsv_resync(s);
575
    if (err < 0)
576
        return err;
577
    if (nsv->state == NSV_FOUND_NSVS)
578
        err = nsv_parse_NSVs_header(s, NULL);
579
    if (err < 0)
580
        return err;
581
    if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF)
582
        return -1;
583

    
584
    auxcount = get_byte(pb);
585
    vsize = get_le16(pb);
586
    asize = get_le16(pb);
587
    vsize = (vsize << 4) | (auxcount >> 4);
588
    auxcount &= 0x0f;
589
    PRINT(("NSV CHUNK %d aux, %u bytes video, %d bytes audio\n", auxcount, vsize, asize));
590
    /* skip aux stuff */
591
    for (i = 0; i < auxcount; i++) {
592
        auxsize = get_le16(pb);
593
        auxtag = get_le32(pb);
594
        PRINT(("NSV aux data: '%c%c%c%c', %d bytes\n",
595
              (auxtag & 0x0ff),
596
              ((auxtag >> 8) & 0x0ff),
597
              ((auxtag >> 16) & 0x0ff),
598
              ((auxtag >> 24) & 0x0ff),
599
              auxsize));
600
        url_fskip(pb, auxsize);
601
        vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming braindead */
602
    }
603

    
604
    if (url_feof(pb))
605
        return -1;
606
    if (!vsize && !asize) {
607
        nsv->state = NSV_UNSYNC;
608
        goto null_chunk_retry;
609
    }
610

    
611
    /* map back streams to v,a */
612
    if (s->streams[0])
613
        st[s->streams[0]->id] = s->streams[0];
614
    if (s->streams[1])
615
        st[s->streams[1]->id] = s->streams[1];
616

    
617
    if (vsize/* && st[NSV_ST_VIDEO]*/) {
618
        nst = st[NSV_ST_VIDEO]->priv_data;
619
        pkt = &nsv->ahead[NSV_ST_VIDEO];
620
        av_get_packet(pb, pkt, vsize);
621
        pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO;
622
        pkt->dts = nst->frame_offset;
623
        pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
624
/*
625
        for (i = 0; i < MIN(8, vsize); i++)
626
            PRINT(("NSV video: [%d] = %02x\n", i, pkt->data[i]));
627
*/
628
    }
629
    if(st[NSV_ST_VIDEO])
630
        ((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset++;
631

    
632
    if (asize/*st[NSV_ST_AUDIO]*/) {
633
        nst = st[NSV_ST_AUDIO]->priv_data;
634
        pkt = &nsv->ahead[NSV_ST_AUDIO];
635
        /* read raw audio specific header on the first audio chunk... */
636
        /* on ALL audio chunks ?? seems so! */
637
        if (asize && st[NSV_ST_AUDIO]->codec->codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) {
638
            uint8_t bps;
639
            uint8_t channels;
640
            uint16_t samplerate;
641
            bps = get_byte(pb);
642
            channels = get_byte(pb);
643
            samplerate = get_le16(pb);
644
            asize-=4;
645
            PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate));
646
            if (fill_header) {
647
                st[NSV_ST_AUDIO]->need_parsing = AVSTREAM_PARSE_NONE; /* we know everything */
648
                if (bps != 16) {
649
                    PRINT(("NSV AUDIO bit/sample != 16 (%d)!!!\n", bps));
650
                }
651
                bps /= channels; // ???
652
                if (bps == 8)
653
                    st[NSV_ST_AUDIO]->codec->codec_id = CODEC_ID_PCM_U8;
654
                samplerate /= 4;/* UGH ??? XXX */
655
                channels = 1;
656
                st[NSV_ST_AUDIO]->codec->channels = channels;
657
                st[NSV_ST_AUDIO]->codec->sample_rate = samplerate;
658
                PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate));
659
            }
660
        }
661
        av_get_packet(pb, pkt, asize);
662
        pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO;
663
        pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
664
        if( nsv->state == NSV_HAS_READ_NSVS && st[NSV_ST_VIDEO] ) {
665
            /* on a nsvs frame we have new information on a/v sync */
666
            pkt->dts = (((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset-1);
667
            pkt->dts *= (int64_t)1000        * nsv->framerate.den;
668
            pkt->dts += (int64_t)nsv->avsync * nsv->framerate.num;
669
            PRINT(("NSV AUDIO: sync:%d, dts:%"PRId64, nsv->avsync, pkt->dts));
670
        }
671
        nst->frame_offset++;
672
    }
673

    
674
    nsv->state = NSV_UNSYNC;
675
    return 0;
676
}
677

    
678

    
679
static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
680
{
681
    NSVContext *nsv = s->priv_data;
682
    int i, err = 0;
683

    
684
    PRINT(("%s()\n", __FUNCTION__));
685

    
686
    /* in case we don't already have something to eat ... */
687
    if (nsv->ahead[0].data == NULL && nsv->ahead[1].data == NULL)
688
        err = nsv_read_chunk(s, 0);
689
    if (err < 0)
690
        return err;
691

    
692
    /* now pick one of the plates */
693
    for (i = 0; i < 2; i++) {
694
        if (nsv->ahead[i].data) {
695
                PRINT(("%s: using cached packet[%d]\n", __FUNCTION__, i));
696
            /* avoid the cost of new_packet + memcpy(->data) */
697
            memcpy(pkt, &nsv->ahead[i], sizeof(AVPacket));
698
            nsv->ahead[i].data = NULL; /* we ate that one */
699
            return pkt->size;
700
        }
701
    }
702

    
703
    /* this restaurant is not approvisionned :^] */
704
    return -1;
705
}
706

    
707
static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
708
{
709
    NSVContext *nsv = s->priv_data;
710
    AVStream *st = s->streams[stream_index];
711
    NSVStream *nst = st->priv_data;
712
    int index;
713

    
714
    index = av_index_search_timestamp(st, timestamp, flags);
715
    if(index < 0)
716
        return -1;
717

    
718
    url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET);
719
    nst->frame_offset = st->index_entries[index].timestamp;
720
    nsv->state = NSV_UNSYNC;
721
    return 0;
722
}
723

    
724
static int nsv_read_close(AVFormatContext *s)
725
{
726
/*     int i; */
727
    NSVContext *nsv = s->priv_data;
728

    
729
    av_freep(&nsv->nsvs_file_offset);
730
    av_freep(&nsv->nsvs_timestamps);
731
    if (nsv->ahead[0].data)
732
        av_free_packet(&nsv->ahead[0]);
733
    if (nsv->ahead[1].data)
734
        av_free_packet(&nsv->ahead[1]);
735

    
736
#if 0
737

738
    for(i=0;i<s->nb_streams;i++) {
739
        AVStream *st = s->streams[i];
740
        NSVStream *ast = st->priv_data;
741
        if(ast){
742
            av_free(ast->index_entries);
743
            av_free(ast);
744
        }
745
        av_free(st->codec->palctrl);
746
    }
747

748
#endif
749
    return 0;
750
}
751

    
752
static int nsv_probe(AVProbeData *p)
753
{
754
    int i;
755
//    PRINT(("nsv_probe(), buf_size %d\n", p->buf_size));
756
    /* check file header */
757
    /* streamed files might not have any header */
758
    if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
759
        p->buf[2] == 'V' && (p->buf[3] == 'f' || p->buf[3] == 's'))
760
        return AVPROBE_SCORE_MAX;
761
    /* XXX: do streamed files always start at chunk boundary ?? */
762
    /* or do we need to search NSVs in the byte stream ? */
763
    /* seems the servers don't bother starting clean chunks... */
764
    /* sometimes even the first header is at 9KB or something :^) */
765
    for (i = 1; i < p->buf_size - 3; i++) {
766
        if (p->buf[i+0] == 'N' && p->buf[i+1] == 'S' &&
767
            p->buf[i+2] == 'V' && p->buf[i+3] == 's')
768
            return AVPROBE_SCORE_MAX-20;
769
    }
770
    /* so we'll have more luck on extension... */
771
    if (av_match_ext(p->filename, "nsv"))
772
        return AVPROBE_SCORE_MAX/2;
773
    /* FIXME: add mime-type check */
774
    return 0;
775
}
776

    
777
AVInputFormat nsv_demuxer = {
778
    "nsv",
779
    NULL_IF_CONFIG_SMALL("Nullsoft Streaming Video"),
780
    sizeof(NSVContext),
781
    nsv_probe,
782
    nsv_read_header,
783
    nsv_read_packet,
784
    nsv_read_close,
785
    nsv_read_seek,
786
};