1/*
2 * NSV demuxer
3 * Copyright (c) 2004 The FFmpeg Project
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21#include "avformat.h"
22#include "riff.h"
23
24//#define DEBUG
25//#define DEBUG_DUMP_INDEX // XXX dumbdriving-271.nsv breaks with it commented!!
26//#define DEBUG_SEEK
27#define CHECK_SUBSEQUENT_NSVS
28//#define DISABLE_AUDIO
29
30/* max bytes to crawl for trying to resync
31 * stupid streaming servers don't start at chunk boundaries...
32 */
33#define NSV_MAX_RESYNC (500*1024)
34#define NSV_MAX_RESYNC_TRIES 300
35
36/*
37 * First version by Francois Revol - revol@free.fr
38 * References:
39 * (1) http://www.multimedia.cx/nsv-format.txt
40 * seems someone came to the same conclusions as me, and updated it:
41 * (2) http://www.stud.ktu.lt/~vitslav/nsv/nsv-format.txt
42 *     http://www.stud.ktu.lt/~vitslav/nsv/
43 * official docs
44 * (3) http://ultravox.aol.com/NSVFormat.rtf
45 * Sample files:
46 * (S1) http://www.nullsoft.com/nsv/samples/
47 * http://www.nullsoft.com/nsv/samples/faster.nsv
48 * 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,
56 * I believe NVSf[16-19] gives the size of the strings data
57 * (that is the offset of the data table after the header).
58 * After checking all samples from (S1) all confirms this.
59 *
60 * Then, about NSVf[12-15], faster.nsf has 179700. When veiwing it in VLC,
61 * I noticed there was about 1 NVSs chunk/s, so I ran
62 * strings faster.nsv | grep NSVs | wc -l
63 * which gave me 180. That leads me to think that NSVf[12-15] might be the
64 * file length in milliseconds.
65 * 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
67 * except for nstrailer (which doesn't have an NSVf header), it repports correct time.
68 *
69 * 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):
73 * for f in [^n]*.nsv; do DUR="$(ffmpeg -i "$f" 2>/dev/null | grep 'NSVf duration' | cut -d ' ' -f 4)"; IC="$(ffmpeg -i "$f" 2>/dev/null | grep 'INDEX ENTRIES' | cut -d ' ' -f 2)"; echo "duration $DUR, slite time $(($DUR/$IC))"; done
74 */
75
76/*
77 * TODO:
78 * - handle timestamps !!!
79 * - use index
80 * - mime-type in probe()
81 * - seek
82 */
83
84#ifdef DEBUG
85#define PRINT(_v) printf _v
86#else
87#define PRINT(_v)
88#endif
89
90#if 0
91struct 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
101struct 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
111struct nsv_avchunk_header {
112    uint8_t vchunk_size_lsb;
113    uint16_t vchunk_size_msb; /* value = (vchunk_size_msb << 4) | (vchunk_size_lsb >> 4) */
114    uint16_t achunk_size;
115};
116
117struct 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
148enum 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
159typedef 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
171typedef 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
188static 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
207static 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);
217static int nsv_read_chunk(AVFormatContext *s, int fill_header);
218
219#ifdef DEBUG
220static 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 */
231static 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
278static 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_set2(&s->metadata, token, value, 0);
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
399static 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;
513fail:
514    /* XXX */
515    nsv->state = NSV_UNSYNC;
516    return -1;
517}
518
519static 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
550static 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
569null_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 ? AV_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 ? AV_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
679static 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
707static 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
724static 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
752static 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
777AVInputFormat 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};
787