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1 27d5f18f François Revol
/*
2
 * NSV decoder.
3
 * Copyright (c) 2004 The FFmpeg Project.
4
 *
5
 * This library is free software; you can redistribute it and/or
6
 * modify it under the terms of the GNU Lesser General Public
7
 * License as published by the Free Software Foundation; either
8
 * version 2 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
11
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13
 * Lesser General Public License for more details.
14
 *
15
 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
17 5509bffa Diego Biurrun
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 27d5f18f François Revol
 */
19
#include "avformat.h"
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#include "avi.h"
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22
#define DEBUG
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//#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
27
28
/* max bytes to crawl for trying to resync
29
 * stupid streaming servers don't start at chunk boundaries...
30
 */
31
#define NSV_MAX_RESYNC (500*1024)
32
#define NSV_MAX_RESYNC_TRIES 300
33
34
/*
35
 * First version by Francois Revol - revol@free.fr
36
 * References:
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 * (1) http://www.multimedia.cx/nsv-format.txt
38
 * seems someone came to the same conclusions as me, and updated it:
39
 * (2) http://www.stud.ktu.lt/~vitslav/nsv/nsv-format.txt
40
 *     http://www.stud.ktu.lt/~vitslav/nsv/
41
 * Sample files:
42
 * (S1) http://www.nullsoft.com/nsv/samples/
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 * http://www.nullsoft.com/nsv/samples/faster.nsv
44
 * http://streamripper.sourceforge.net/openbb/read.php?TID=492&page=4
45
 */
46
47
/*
48
 * notes on the header (Francois Revol):
49 115329f1 Diego Biurrun
 *
50
 * It is followed by strings, then a table, but nothing tells
51 27d5f18f François Revol
 * where the table begins according to (1). After checking faster.nsv,
52
 * I believe NVSf[16-19] gives the size of the strings data
53
 * (that is the offset of the data table after the header).
54
 * After checking all samples from (S1) all confirms this.
55
 *
56
 * Then, about NSVf[12-15], faster.nsf has 179700. When veiwing it in VLC,
57
 * I noticed there was about 1 NVSs chunk/s, so I ran
58
 * strings faster.nsv | grep NSVs | wc -l
59 115329f1 Diego Biurrun
 * which gave me 180. That leads me to think that NSVf[12-15] might be the
60 27d5f18f François Revol
 * file length in milliseconds.
61
 * Let's try that:
62
 * 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
63
 * except for nstrailer (which doesn't have an NSVf header), it repports correct time.
64
 *
65 115329f1 Diego Biurrun
 * nsvtrailer.nsv (S1) does not have any NSVf header, only NSVs chunks,
66 27d5f18f François Revol
 * so the header seems to not be mandatory. (for streaming).
67 115329f1 Diego Biurrun
 *
68 27d5f18f François Revol
 * index slice duration check (excepts nsvtrailer.nsv):
69
 * 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
70
 */
71
72
/*
73
 * TODO:
74
 * - handle timestamps !!!
75
 * - use index
76
 * - mime-type in probe()
77
 * - seek
78
 */
79
80
#ifdef DEBUG
81
#define PRINT(_v) printf _v
82
#else
83 115329f1 Diego Biurrun
#define PRINT(_v)
84 27d5f18f François Revol
#endif
85
86
#if 0
87
struct NSVf_header {
88
    uint32_t chunk_tag; /* 'NSVf' */
89
    uint32_t chunk_size;
90
    uint32_t file_size; /* max 4GB ??? noone learns anything it seems :^) */
91
    uint32_t file_length; //unknown1;  /* what about MSB of file_size ? */
92
    uint32_t info_strings_size; /* size of the info strings */ //unknown2;
93
    uint32_t table_entries;
94
    uint32_t table_entries_used; /* the left ones should be -1 */
95
};
96

97
struct NSVs_header {
98
    uint32_t chunk_tag; /* 'NSVs' */
99
    uint32_t v4cc;      /* or 'NONE' */
100
    uint32_t a4cc;      /* or 'NONE' */
101
    uint16_t vwidth;    /* assert(vwidth%16==0) */
102
    uint16_t vheight;   /* assert(vheight%16==0) */
103
    uint8_t framerate;  /* value = (framerate&0x80)?frtable[frameratex0x7f]:framerate */
104
    uint16_t unknown;
105
};
106

107
struct nsv_avchunk_header {
108
    uint8_t vchunk_size_lsb;
109
    uint16_t vchunk_size_msb; /* value = (vchunk_size_msb << 4) | (vchunk_size_lsb >> 4) */
110
    uint16_t achunk_size;
111
};
112

113
struct nsv_pcm_header {
114
    uint8_t bits_per_sample;
115
    uint8_t channel_count;
116
    uint16_t sample_rate;
117
};
118
#endif
119
120
/* variation from avi.h */
121
/*typedef struct CodecTag {
122
    int id;
123
    unsigned int tag;
124
} CodecTag;*/
125
126
/* tags */
127
128
#define T_NSVF MKTAG('N', 'S', 'V', 'f') /* file header */
129
#define T_NSVS MKTAG('N', 'S', 'V', 's') /* chunk header */
130
#define T_TOC2 MKTAG('T', 'O', 'C', '2') /* extra index marker */
131
#define T_NONE MKTAG('N', 'O', 'N', 'E') /* null a/v 4CC */
132
#define T_SUBT MKTAG('S', 'U', 'B', 'T') /* subtitle aux data */
133
#define T_ASYN MKTAG('A', 'S', 'Y', 'N') /* async a/v aux marker */
134
#define T_KEYF MKTAG('K', 'E', 'Y', 'F') /* video keyframe aux marker (addition) */
135
136
#define TB_NSVF MKBETAG('N', 'S', 'V', 'f')
137
#define TB_NSVS MKBETAG('N', 'S', 'V', 's')
138
139
/* hardcoded stream indices */
140
#define NSV_ST_VIDEO 0
141
#define NSV_ST_AUDIO 1
142
#define NSV_ST_SUBT 2
143
144
enum NSVStatus {
145
    NSV_UNSYNC,
146
    NSV_FOUND_NSVF,
147
    NSV_HAS_READ_NSVF,
148
    NSV_FOUND_NSVS,
149
    NSV_HAS_READ_NSVS,
150
    NSV_FOUND_BEEF,
151
    NSV_GOT_VIDEO,
152
    NSV_GOT_AUDIO,
153
};
154
155
typedef struct NSVStream {
156
    int frame_offset; /* current frame (video) or byte (audio) counter
157
                         (used to compute the pts) */
158
    int scale;
159 115329f1 Diego Biurrun
    int rate;
160 27d5f18f François Revol
    int sample_size; /* audio only data */
161
    int start;
162 115329f1 Diego Biurrun
163 27d5f18f François Revol
    int new_frame_offset; /* temporary storage (used during seek) */
164
    int cum_len; /* temporary storage (used during seek) */
165
} NSVStream;
166
167
typedef struct {
168
    int  base_offset;
169
    int  NSVf_end;
170
    uint32_t *nsvf_index_data;
171
    int index_entries;
172
    enum NSVStatus state;
173
    AVPacket ahead[2]; /* [v, a] if .data is !NULL there is something */
174
    /* cached */
175
    int64_t duration;
176
    uint32_t vtag, atag;
177
    uint16_t vwidth, vheight;
178
    //DVDemuxContext* dv_demux;
179
} NSVContext;
180
181
static const CodecTag nsv_codec_video_tags[] = {
182
    { CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') },
183
    { CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
184
    { CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
185
/*
186
    { CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') },
187
    { CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') },
188
    { CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') },
189
    { CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
190
    { CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') },
191
    { CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') },
192
    { CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') },
193
    { CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
194
*/
195
    { CODEC_ID_XVID, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */
196
    { CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') },
197
    { 0, 0 },
198
};
199
200
static const CodecTag nsv_codec_audio_tags[] = {
201
    { CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') },
202
    { CODEC_ID_AAC, MKTAG('A', 'A', 'C', ' ') },
203
    { CODEC_ID_AAC, MKTAG('A', 'A', 'C', 'P') }, /* _CUTTED__MUXED_2 Heads - Out Of The City.nsv */
204
    { CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') },
205
    { 0, 0 },
206
};
207
208 c8389233 Michael Niedermayer
static const AVRational nsv_framerate_table[] = {
209
    {30,1},
210
    {30000,1001},
211
    {25,1},
212
    {24000,1001},
213
    {30,1},
214
    {15000,1001},
215 27d5f18f François Revol
};
216
217
//static int nsv_load_index(AVFormatContext *s);
218
static int nsv_read_chunk(AVFormatContext *s, int fill_header);
219
220
#ifdef DEBUG
221
static void print_tag(const char *str, unsigned int tag, int size)
222
{
223
    printf("%s: tag=%c%c%c%c\n",
224
           str, tag & 0xff,
225
           (tag >> 8) & 0xff,
226
           (tag >> 16) & 0xff,
227
           (tag >> 24) & 0xff);
228
}
229
#endif
230
231
/* try to find something we recognize, and set the state accordingly */
232
static int nsv_resync(AVFormatContext *s)
233
{
234
    NSVContext *nsv = s->priv_data;
235
    ByteIOContext *pb = &s->pb;
236 e4917f59 Mike Melanson
    uint32_t v = 0;
237 27d5f18f François Revol
    int i;
238 115329f1 Diego Biurrun
239 4733abcb Måns Rullgård
    PRINT(("%s(), offset = %"PRId64", state = %d\n", __FUNCTION__, url_ftell(pb), nsv->state));
240 115329f1 Diego Biurrun
241 27d5f18f François Revol
    //nsv->state = NSV_UNSYNC;
242 115329f1 Diego Biurrun
243 27d5f18f François Revol
    for (i = 0; i < NSV_MAX_RESYNC; i++) {
244
        if (url_feof(pb)) {
245
            PRINT(("NSV EOF\n"));
246
            nsv->state = NSV_UNSYNC;
247
            return -1;
248
        }
249
        v <<= 8;
250
        v |= get_byte(pb);
251
/*
252
        if (i < 8) {
253
            PRINT(("NSV resync: [%d] = %02x\n", i, v & 0x0FF));
254
        }
255
*/
256 115329f1 Diego Biurrun
257 27d5f18f François Revol
        if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */
258
            PRINT(("NSV resynced on BEEF after %d bytes\n", i+1));
259
            nsv->state = NSV_FOUND_BEEF;
260
            return 0;
261
        }
262
        /* we read as big endian, thus the MK*BE* */
263
        if (v == TB_NSVF) { /* NSVf */
264
            PRINT(("NSV resynced on NSVf after %d bytes\n", i+1));
265
            nsv->state = NSV_FOUND_NSVF;
266
            return 0;
267
        }
268
        if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */
269
            PRINT(("NSV resynced on NSVs after %d bytes\n", i+1));
270
            nsv->state = NSV_FOUND_NSVS;
271
            return 0;
272
        }
273 115329f1 Diego Biurrun
274 27d5f18f François Revol
    }
275
    PRINT(("NSV sync lost\n"));
276
    return -1;
277
}
278
279
static int nsv_parse_NSVf_header(AVFormatContext *s, AVFormatParameters *ap)
280
{
281
    NSVContext *nsv = s->priv_data;
282
    ByteIOContext *pb = &s->pb;
283 88730be6 Måns Rullgård
    unsigned int file_size, size;
284 27d5f18f François Revol
    int64_t duration;
285
    int strings_size;
286
    int table_entries;
287
    int table_entries_used;
288
289
    PRINT(("%s()\n", __FUNCTION__));
290
291
    nsv->state = NSV_UNSYNC; /* in case we fail */
292 115329f1 Diego Biurrun
293 27d5f18f François Revol
    size = get_le32(pb);
294
    if (size < 28)
295
        return -1;
296
    nsv->NSVf_end = size;
297
298
    //s->file_size = (uint32_t)get_le32(pb);
299
    file_size = (uint32_t)get_le32(pb);
300 bf4e3bd2 Måns Rullgård
    PRINT(("NSV NSVf chunk_size %u\n", size));
301
    PRINT(("NSV NSVf file_size %u\n", file_size));
302 27d5f18f François Revol
303 c0df9d75 Michael Niedermayer
    nsv->duration = duration = get_le32(pb); /* in ms */
304 4733abcb Måns Rullgård
    PRINT(("NSV NSVf duration %"PRId64" ms\n", duration));
305 27d5f18f François Revol
    // XXX: store it in AVStreams
306
307
    strings_size = get_le32(pb);
308
    table_entries = get_le32(pb);
309
    table_entries_used = get_le32(pb);
310 115329f1 Diego Biurrun
    PRINT(("NSV NSVf info-strings size: %d, table entries: %d, bis %d\n",
311 27d5f18f François Revol
            strings_size, table_entries, table_entries_used));
312
    if (url_feof(pb))
313
        return -1;
314 115329f1 Diego Biurrun
315 4733abcb Måns Rullgård
    PRINT(("NSV got header; filepos %"PRId64"\n", url_ftell(pb)));
316 27d5f18f François Revol
317
    if (strings_size > 0) {
318
        char *strings; /* last byte will be '\0' to play safe with str*() */
319
        char *p, *endp;
320
        char *token, *value;
321
        char quote;
322
323
        p = strings = av_mallocz(strings_size + 1);
324
        endp = strings + strings_size;
325
        get_buffer(pb, strings, strings_size);
326
        while (p < endp) {
327
            while (*p == ' ')
328
                p++; /* strip out spaces */
329
            if (p >= endp-2)
330
                break;
331
            token = p;
332
            p = strchr(p, '=');
333
            if (!p || p >= endp-2)
334
                break;
335
            *p++ = '\0';
336
            quote = *p++;
337
            value = p;
338
            p = strchr(p, quote);
339
            if (!p || p >= endp)
340
                break;
341
            *p++ = '\0';
342
            PRINT(("NSV NSVf INFO: %s='%s'\n", token, value));
343
            if (!strcmp(token, "ASPECT")) {
344
                /* don't care */
345
            } else if (!strcmp(token, "CREATOR") || !strcmp(token, "Author")) {
346
                strncpy(s->author, value, 512-1);
347
            } else if (!strcmp(token, "Copyright")) {
348
                strncpy(s->copyright, value, 512-1);
349
            } else if (!strcmp(token, "TITLE") || !strcmp(token, "Title")) {
350
                strncpy(s->title, value, 512-1);
351
            }
352
        }
353
        av_free(strings);
354
    }
355
    if (url_feof(pb))
356
        return -1;
357 115329f1 Diego Biurrun
358 4733abcb Måns Rullgård
    PRINT(("NSV got infos; filepos %"PRId64"\n", url_ftell(pb)));
359 27d5f18f François Revol
360
    if (table_entries_used > 0) {
361
        nsv->index_entries = table_entries_used;
362 568e18b1 Michael Niedermayer
        if((unsigned)table_entries >= UINT_MAX / sizeof(uint32_t))
363
            return -1;
364 27d5f18f François Revol
        nsv->nsvf_index_data = av_malloc(table_entries * sizeof(uint32_t));
365 4733abcb Måns Rullgård
#warning "FIXME: Byteswap buffer as needed"
366
        get_buffer(pb, (unsigned char *)nsv->nsvf_index_data, table_entries * sizeof(uint32_t));
367 27d5f18f François Revol
    }
368
369 4733abcb Måns Rullgård
    PRINT(("NSV got index; filepos %"PRId64"\n", url_ftell(pb)));
370 115329f1 Diego Biurrun
371 27d5f18f François Revol
#ifdef DEBUG_DUMP_INDEX
372
#define V(v) ((v<0x20 || v > 127)?'.':v)
373
    /* dump index */
374
    PRINT(("NSV %d INDEX ENTRIES:\n", table_entries));
375
    PRINT(("NSV [dataoffset][fileoffset]\n", table_entries));
376
    for (i = 0; i < table_entries; i++) {
377
        unsigned char b[8];
378
        url_fseek(pb, size + nsv->nsvf_index_data[i], SEEK_SET);
379
        get_buffer(pb, b, 8);
380
        PRINT(("NSV [0x%08lx][0x%08lx]: %02x %02x %02x %02x %02x %02x %02x %02x"
381
           "%c%c%c%c%c%c%c%c\n",
382
           nsv->nsvf_index_data[i], size + nsv->nsvf_index_data[i],
383 115329f1 Diego Biurrun
           b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7],
384 27d5f18f François Revol
           V(b[0]), V(b[1]), V(b[2]), V(b[3]), V(b[4]), V(b[5]), V(b[6]), V(b[7]) ));
385
    }
386
    //url_fseek(pb, size, SEEK_SET); /* go back to end of header */
387
#undef V
388
#endif
389 115329f1 Diego Biurrun
390 27d5f18f François Revol
    url_fseek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */
391 115329f1 Diego Biurrun
392 27d5f18f François Revol
    if (url_feof(pb))
393
        return -1;
394
    nsv->state = NSV_HAS_READ_NSVF;
395
    return 0;
396
}
397
398
static int nsv_parse_NSVs_header(AVFormatContext *s, AVFormatParameters *ap)
399
{
400
    NSVContext *nsv = s->priv_data;
401
    ByteIOContext *pb = &s->pb;
402
    uint32_t vtag, atag;
403
    uint16_t vwidth, vheight;
404 c8389233 Michael Niedermayer
    AVRational framerate;
405
    int i;
406 27d5f18f François Revol
    uint16_t unknown;
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 c8389233 Michael Niedermayer
    i = get_byte(pb);
416 27d5f18f François Revol
    /* XXX how big must the table be ? */
417
    /* seems there is more to that... */
418 c8389233 Michael Niedermayer
    PRINT(("NSV NSVs framerate code %2x\n", i));
419
    if(i&0x80) framerate= nsv_framerate_table[i & 0x7F];
420
    else       framerate= (AVRational){i, 1};
421 27d5f18f François Revol
    unknown = get_le16(pb);
422
#ifdef DEBUG
423
    print_tag("NSV NSVs vtag", vtag, 0);
424
    print_tag("NSV NSVs atag", atag, 0);
425
    PRINT(("NSV NSVs vsize %dx%d\n", vwidth, vheight));
426
#endif
427 115329f1 Diego Biurrun
428 27d5f18f François Revol
    /* XXX change to ap != NULL ? */
429
    if (s->nb_streams == 0) { /* streams not yet published, let's do that */
430
        nsv->vtag = vtag;
431
        nsv->atag = atag;
432
        nsv->vwidth = vwidth;
433
        nsv->vheight = vwidth;
434
        if (vtag != T_NONE) {
435
            st = av_new_stream(s, NSV_ST_VIDEO);
436
            if (!st)
437
                goto fail;
438
439
            nst = av_mallocz(sizeof(NSVStream));
440
            if (!nst)
441
                goto fail;
442
            st->priv_data = nst;
443 01f4895c Michael Niedermayer
            st->codec->codec_type = CODEC_TYPE_VIDEO;
444
            st->codec->codec_tag = vtag;
445
            st->codec->codec_id = codec_get_id(nsv_codec_video_tags, vtag);
446
            st->codec->width = vwidth;
447
            st->codec->height = vheight;
448
            st->codec->bits_per_sample = 24; /* depth XXX */
449 27d5f18f François Revol
450 c8389233 Michael Niedermayer
            av_set_pts_info(st, 64, framerate.den, framerate.num);
451 27d5f18f François Revol
            st->start_time = 0;
452 c0df9d75 Michael Niedermayer
            st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den);
453 27d5f18f François Revol
        }
454
        if (atag != T_NONE) {
455
#ifndef DISABLE_AUDIO
456
            st = av_new_stream(s, NSV_ST_AUDIO);
457
            if (!st)
458
                goto fail;
459
460
            nst = av_mallocz(sizeof(NSVStream));
461
            if (!nst)
462
                goto fail;
463
            st->priv_data = nst;
464 01f4895c Michael Niedermayer
            st->codec->codec_type = CODEC_TYPE_AUDIO;
465
            st->codec->codec_tag = atag;
466
            st->codec->codec_id = codec_get_id(nsv_codec_audio_tags, atag);
467 27d5f18f François Revol
            st->start_time = 0;
468 c0df9d75 Michael Niedermayer
//            st->duration = nsv->duration; //FIXME
469 115329f1 Diego Biurrun
470 27d5f18f François Revol
            st->need_parsing = 1; /* for PCM we will read a chunk later and put correct info */
471
            /* XXX:FIXME */
472 01f4895c Michael Niedermayer
            //st->codec->channels = 2; //XXX:channels;
473
            //st->codec->sample_rate = 1000;
474
            //av_set_pts_info(st, 64, 1, st->codec->sample_rate);
475 27d5f18f François Revol
476
#endif
477
        }
478
#ifdef CHECK_SUBSEQUENT_NSVS
479
    } else {
480
        if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) {
481
            PRINT(("NSV NSVs header values differ from the first one!!!\n"));
482
            //return -1;
483
        }
484
#endif /* CHECK_SUBSEQUENT_NSVS */
485
    }
486
487
    nsv->state = NSV_HAS_READ_NSVS;
488
    return 0;
489
fail:
490
    /* XXX */
491
    nsv->state = NSV_UNSYNC;
492
    return -1;
493
}
494
495
static int nsv_read_header(AVFormatContext *s, AVFormatParameters *ap)
496
{
497
    NSVContext *nsv = s->priv_data;
498 88730be6 Måns Rullgård
    int i, err;
499 27d5f18f François Revol
500
    PRINT(("%s()\n", __FUNCTION__));
501
    PRINT(("filename '%s'\n", s->filename));
502
503
    nsv->state = NSV_UNSYNC;
504
    nsv->ahead[0].data = nsv->ahead[1].data = NULL;
505 115329f1 Diego Biurrun
506 27d5f18f François Revol
    for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
507
        if (nsv_resync(s) < 0)
508
            return -1;
509
        if (nsv->state == NSV_FOUND_NSVF)
510
            err = nsv_parse_NSVf_header(s, ap);
511
            /* we need the first NSVs also... */
512
        if (nsv->state == NSV_FOUND_NSVS) {
513
            err = nsv_parse_NSVs_header(s, ap);
514
            break; /* we just want the first one */
515
        }
516
    }
517
    if (s->nb_streams < 1) /* no luck so far */
518
        return -1;
519
    /* now read the first chunk, so we can attempt to decode more info */
520
    err = nsv_read_chunk(s, 1);
521 115329f1 Diego Biurrun
522 27d5f18f François Revol
    PRINT(("parsed header\n"));
523
    return 0;
524
}
525
526
static int nsv_read_chunk(AVFormatContext *s, int fill_header)
527
{
528
    NSVContext *nsv = s->priv_data;
529
    ByteIOContext *pb = &s->pb;
530
    AVStream *st[2] = {NULL, NULL};
531
    NSVStream *nst;
532
    AVPacket *pkt;
533
    int i, err = 0;
534 e4917f59 Mike Melanson
    uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */
535
    uint32_t vsize;
536
    uint16_t asize;
537
    uint16_t auxsize;
538
    uint32_t auxtag;
539 115329f1 Diego Biurrun
540 27d5f18f François Revol
    PRINT(("%s(%d)\n", __FUNCTION__, fill_header));
541 115329f1 Diego Biurrun
542 27d5f18f François Revol
    if (nsv->ahead[0].data || nsv->ahead[1].data)
543
        return 0; //-1; /* hey! eat what you've in your plate first! */
544
545
null_chunk_retry:
546
    if (url_feof(pb))
547
        return -1;
548 115329f1 Diego Biurrun
549 27d5f18f François Revol
    for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++)
550
        err = nsv_resync(s);
551
    if (err < 0)
552
        return err;
553
    if (nsv->state == NSV_FOUND_NSVS)
554
        err = nsv_parse_NSVs_header(s, NULL);
555
    if (err < 0)
556
        return err;
557
    if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF)
558
        return -1;
559 115329f1 Diego Biurrun
560 27d5f18f François Revol
    auxcount = get_byte(pb);
561
    vsize = get_le16(pb);
562
    asize = get_le16(pb);
563
    vsize = (vsize << 4) | (auxcount >> 4);
564
    auxcount &= 0x0f;
565 bf4e3bd2 Måns Rullgård
    PRINT(("NSV CHUNK %d aux, %u bytes video, %d bytes audio\n", auxcount, vsize, asize));
566 27d5f18f François Revol
    /* skip aux stuff */
567
    for (i = 0; i < auxcount; i++) {
568
        auxsize = get_le16(pb);
569
        auxtag = get_le32(pb);
570 115329f1 Diego Biurrun
        PRINT(("NSV aux data: '%c%c%c%c', %d bytes\n",
571
              (auxtag & 0x0ff),
572
              ((auxtag >> 8) & 0x0ff),
573 27d5f18f François Revol
              ((auxtag >> 16) & 0x0ff),
574
              ((auxtag >> 24) & 0x0ff),
575
              auxsize));
576
        url_fskip(pb, auxsize);
577 e4917f59 Mike Melanson
        vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming braindead */
578 27d5f18f François Revol
    }
579 115329f1 Diego Biurrun
580 27d5f18f François Revol
    if (url_feof(pb))
581
        return -1;
582
    if (!vsize && !asize) {
583
        nsv->state = NSV_UNSYNC;
584
        goto null_chunk_retry;
585
    }
586 115329f1 Diego Biurrun
587 27d5f18f François Revol
    /* map back streams to v,a */
588
    if (s->streams[0])
589
        st[s->streams[0]->id] = s->streams[0];
590
    if (s->streams[1])
591
        st[s->streams[1]->id] = s->streams[1];
592 115329f1 Diego Biurrun
593 27d5f18f François Revol
    if (vsize/* && st[NSV_ST_VIDEO]*/) {
594
        nst = st[NSV_ST_VIDEO]->priv_data;
595
        pkt = &nsv->ahead[NSV_ST_VIDEO];
596 2692067a Michael Niedermayer
        av_get_packet(pb, pkt, vsize);
597 27d5f18f François Revol
        pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO;
598
        pkt->dts = nst->frame_offset++;
599
        pkt->flags |= PKT_FLAG_KEY; /* stupid format has no way to tell XXX: try the index */
600
/*
601
        for (i = 0; i < MIN(8, vsize); i++)
602
            PRINT(("NSV video: [%d] = %02x\n", i, pkt->data[i]));
603
*/
604
    }
605
    if (asize/*st[NSV_ST_AUDIO]*/) {
606
        nst = st[NSV_ST_AUDIO]->priv_data;
607
        pkt = &nsv->ahead[NSV_ST_AUDIO];
608
        /* read raw audio specific header on the first audio chunk... */
609
        /* on ALL audio chunks ?? seems so! */
610 01f4895c Michael Niedermayer
        if (asize && st[NSV_ST_AUDIO]->codec->codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) {
611 27d5f18f François Revol
            uint8_t bps;
612
            uint8_t channels;
613
            uint16_t samplerate;
614
            bps = get_byte(pb);
615
            channels = get_byte(pb);
616
            samplerate = get_le16(pb);
617
            asize-=4;
618 bf4e3bd2 Måns Rullgård
            PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate));
619 27d5f18f François Revol
            if (fill_header) {
620
                st[NSV_ST_AUDIO]->need_parsing = 0; /* we know everything */
621
                if (bps != 16) {
622
                    PRINT(("NSV AUDIO bit/sample != 16 (%d)!!!\n", bps));
623
                }
624
                bps /= channels; // ???
625
                if (bps == 8)
626 01f4895c Michael Niedermayer
                    st[NSV_ST_AUDIO]->codec->codec_id = CODEC_ID_PCM_U8;
627 27d5f18f François Revol
                samplerate /= 4;/* UGH ??? XXX */
628
                channels = 1;
629 01f4895c Michael Niedermayer
                st[NSV_ST_AUDIO]->codec->channels = channels;
630
                st[NSV_ST_AUDIO]->codec->sample_rate = samplerate;
631 115329f1 Diego Biurrun
                av_set_pts_info(st[NSV_ST_AUDIO], 64, 1,
632 01f4895c Michael Niedermayer
                                st[NSV_ST_AUDIO]->codec->sample_rate);
633 bf4e3bd2 Måns Rullgård
                PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate));
634 27d5f18f François Revol
            }
635
        }
636 2692067a Michael Niedermayer
        av_get_packet(pb, pkt, asize);
637 27d5f18f François Revol
        pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO;
638
        //pkt->dts = nst->frame_offset;
639
        //if (nst->sample_size)
640
        //    pkt->dts /= nst->sample_size;
641
        nst->frame_offset += asize; // XXX: that's valid only for PCM !?
642
    }
643 115329f1 Diego Biurrun
644 27d5f18f François Revol
    //pkt->flags |= PKT_FLAG_KEY;
645
    nsv->state = NSV_UNSYNC;
646
    return 0;
647
}
648
649
650
static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
651
{
652
    NSVContext *nsv = s->priv_data;
653
    int i, err = 0;
654
655
    PRINT(("%s()\n", __FUNCTION__));
656 115329f1 Diego Biurrun
657 27d5f18f François Revol
    /* in case we don't already have something to eat ... */
658
    if (nsv->ahead[0].data == NULL && nsv->ahead[1].data == NULL)
659
        err = nsv_read_chunk(s, 0);
660
    if (err < 0)
661
        return err;
662 115329f1 Diego Biurrun
663 27d5f18f François Revol
    /* now pick one of the plates */
664
    for (i = 0; i < 2; i++) {
665
        if (nsv->ahead[i].data) {
666 bb270c08 Diego Biurrun
                PRINT(("%s: using cached packet[%d]\n", __FUNCTION__, i));
667 27d5f18f François Revol
            /* avoid the cost of new_packet + memcpy(->data) */
668
            memcpy(pkt, &nsv->ahead[i], sizeof(AVPacket));
669
            nsv->ahead[i].data = NULL; /* we ate that one */
670
            return pkt->size;
671
        }
672
    }
673 115329f1 Diego Biurrun
674 27d5f18f François Revol
    /* this restaurant is not approvisionned :^] */
675
    return -1;
676
}
677
678
static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
679
{
680 88730be6 Måns Rullgård
#if 0
681 27d5f18f François Revol
    NSVContext *avi = s->priv_data;
682
    AVStream *st;
683
    NSVStream *ast;
684
    int frame_number, i;
685
    int64_t pos;
686 88730be6 Måns Rullgård
#endif
687 27d5f18f François Revol
688
    return -1;
689
}
690
691
static int nsv_read_close(AVFormatContext *s)
692
{
693 88730be6 Måns Rullgård
/*     int i; */
694 27d5f18f François Revol
    NSVContext *nsv = s->priv_data;
695
696
    if (nsv->index_entries)
697
        av_free(nsv->nsvf_index_data);
698
699
#if 0
700

701
    for(i=0;i<s->nb_streams;i++) {
702
        AVStream *st = s->streams[i];
703
        NSVStream *ast = st->priv_data;
704
        if(ast){
705
            av_free(ast->index_entries);
706
            av_free(ast);
707
        }
708 01f4895c Michael Niedermayer
        av_free(st->codec->extradata);
709
        av_free(st->codec->palctrl);
710 27d5f18f François Revol
    }
711

712
#endif
713
    return 0;
714
}
715
716
static int nsv_probe(AVProbeData *p)
717
{
718
    int i;
719 61f4aa96 Michael Niedermayer
//    PRINT(("nsv_probe(), buf_size %d\n", p->buf_size));
720 27d5f18f François Revol
    /* check file header */
721
    if (p->buf_size <= 32)
722
        return 0;
723
    if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
724
        p->buf[2] == 'V' && p->buf[3] == 'f')
725
        return AVPROBE_SCORE_MAX;
726
    /* streamed files might not have any header */
727
    if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
728
        p->buf[2] == 'V' && p->buf[3] == 's')
729
        return AVPROBE_SCORE_MAX;
730
    /* XXX: do streamed files always start at chunk boundary ?? */
731
    /* or do we need to search NSVs in the byte stream ? */
732
    /* seems the servers don't bother starting clean chunks... */
733
    /* sometimes even the first header is at 9KB or something :^) */
734
    for (i = 1; i < p->buf_size - 3; i++) {
735
        if (p->buf[i+0] == 'N' && p->buf[i+1] == 'S' &&
736
            p->buf[i+2] == 'V' && p->buf[i+3] == 's')
737
            return AVPROBE_SCORE_MAX-20;
738
    }
739
    /* so we'll have more luck on extension... */
740
    if (match_ext(p->filename, "nsv"))
741
        return AVPROBE_SCORE_MAX-20;
742
    /* FIXME: add mime-type check */
743
    return 0;
744
}
745
746
static AVInputFormat nsv_iformat = {
747
    "nsv",
748
    "NullSoft Video format",
749
    sizeof(NSVContext),
750
    nsv_probe,
751
    nsv_read_header,
752
    nsv_read_packet,
753
    nsv_read_close,
754
    nsv_read_seek,
755
};
756
757
int nsvdec_init(void)
758
{
759
    av_register_input_format(&nsv_iformat);
760
    return 0;
761
}