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 *nsvf_index_data;
175    int index_entries;
176    enum NSVStatus state;
177    AVPacket ahead[2]; /* [v, a] if .data is !NULL there is something */
178    /* cached */
179    int64_t duration;
180    uint32_t vtag, atag;
181    uint16_t vwidth, vheight;
182    int16_t avsync;
183    AVRational framerate;
184    //DVDemuxContext* dv_demux;
185} NSVContext;
186
187static const AVCodecTag nsv_codec_video_tags[] = {
188    { CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') },
189    { CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
190    { CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
191    { CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') },
192    { CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
193    { CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') },
194    { CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') },
195    { CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') },
196    { CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
197/*
198    { CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') },
199    { CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') },
200*/
201    { CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */
202    { CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') },
203    { 0, 0 },
204};
205
206static const AVCodecTag nsv_codec_audio_tags[] = {
207    { CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') },
208    { CODEC_ID_AAC, MKTAG('A', 'A', 'C', ' ') },
209    { CODEC_ID_AAC, MKTAG('A', 'A', 'C', 'P') }, /* _CUTTED__MUXED_2 Heads - Out Of The City.nsv */
210    { CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') },
211    { 0, 0 },
212};
213
214//static int nsv_load_index(AVFormatContext *s);
215static int nsv_read_chunk(AVFormatContext *s, int fill_header);
216
217#ifdef DEBUG
218static void print_tag(const char *str, unsigned int tag, int size)
219{
220    printf("%s: tag=%c%c%c%c\n",
221           str, tag & 0xff,
222           (tag >> 8) & 0xff,
223           (tag >> 16) & 0xff,
224           (tag >> 24) & 0xff);
225}
226#endif
227
228/* try to find something we recognize, and set the state accordingly */
229static int nsv_resync(AVFormatContext *s)
230{
231    NSVContext *nsv = s->priv_data;
232    ByteIOContext *pb = s->pb;
233    uint32_t v = 0;
234    int i;
235
236    PRINT(("%s(), offset = %"PRId64", state = %d\n", __FUNCTION__, url_ftell(pb), nsv->state));
237
238    //nsv->state = NSV_UNSYNC;
239
240    for (i = 0; i < NSV_MAX_RESYNC; i++) {
241        if (url_feof(pb)) {
242            PRINT(("NSV EOF\n"));
243            nsv->state = NSV_UNSYNC;
244            return -1;
245        }
246        v <<= 8;
247        v |= get_byte(pb);
248/*
249        if (i < 8) {
250            PRINT(("NSV resync: [%d] = %02x\n", i, v & 0x0FF));
251        }
252*/
253
254        if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */
255            PRINT(("NSV resynced on BEEF after %d bytes\n", i+1));
256            nsv->state = NSV_FOUND_BEEF;
257            return 0;
258        }
259        /* we read as big endian, thus the MK*BE* */
260        if (v == TB_NSVF) { /* NSVf */
261            PRINT(("NSV resynced on NSVf after %d bytes\n", i+1));
262            nsv->state = NSV_FOUND_NSVF;
263            return 0;
264        }
265        if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */
266            PRINT(("NSV resynced on NSVs after %d bytes\n", i+1));
267            nsv->state = NSV_FOUND_NSVS;
268            return 0;
269        }
270
271    }
272    PRINT(("NSV sync lost\n"));
273    return -1;
274}
275
276static int nsv_parse_NSVf_header(AVFormatContext *s, AVFormatParameters *ap)
277{
278    NSVContext *nsv = s->priv_data;
279    ByteIOContext *pb = s->pb;
280    unsigned int file_size, size;
281    int64_t duration;
282    int strings_size;
283    int table_entries;
284    int table_entries_used;
285
286    PRINT(("%s()\n", __FUNCTION__));
287
288    nsv->state = NSV_UNSYNC; /* in case we fail */
289
290    size = get_le32(pb);
291    if (size < 28)
292        return -1;
293    nsv->NSVf_end = size;
294
295    //s->file_size = (uint32_t)get_le32(pb);
296    file_size = (uint32_t)get_le32(pb);
297    PRINT(("NSV NSVf chunk_size %u\n", size));
298    PRINT(("NSV NSVf file_size %u\n", file_size));
299
300    nsv->duration = duration = get_le32(pb); /* in ms */
301    PRINT(("NSV NSVf duration %"PRId64" ms\n", duration));
302    // XXX: store it in AVStreams
303
304    strings_size = get_le32(pb);
305    table_entries = get_le32(pb);
306    table_entries_used = get_le32(pb);
307    PRINT(("NSV NSVf info-strings size: %d, table entries: %d, bis %d\n",
308            strings_size, table_entries, table_entries_used));
309    if (url_feof(pb))
310        return -1;
311
312    PRINT(("NSV got header; filepos %"PRId64"\n", url_ftell(pb)));
313
314    if (strings_size > 0) {
315        char *strings; /* last byte will be '\0' to play safe with str*() */
316        char *p, *endp;
317        char *token, *value;
318        char quote;
319
320        p = strings = av_mallocz(strings_size + 1);
321        endp = strings + strings_size;
322        get_buffer(pb, strings, strings_size);
323        while (p < endp) {
324            while (*p == ' ')
325                p++; /* strip out spaces */
326            if (p >= endp-2)
327                break;
328            token = p;
329            p = strchr(p, '=');
330            if (!p || p >= endp-2)
331                break;
332            *p++ = '\0';
333            quote = *p++;
334            value = p;
335            p = strchr(p, quote);
336            if (!p || p >= endp)
337                break;
338            *p++ = '\0';
339            PRINT(("NSV NSVf INFO: %s='%s'\n", token, value));
340            av_metadata_set(&s->metadata, token, value);
341        }
342        av_free(strings);
343    }
344    if (url_feof(pb))
345        return -1;
346
347    PRINT(("NSV got infos; filepos %"PRId64"\n", url_ftell(pb)));
348
349    if (table_entries_used > 0) {
350        nsv->index_entries = table_entries_used;
351        if((unsigned)table_entries >= UINT_MAX / sizeof(uint32_t))
352            return -1;
353        nsv->nsvf_index_data = av_malloc(table_entries * sizeof(uint32_t));
354#warning "FIXME: Byteswap buffer as needed"
355        get_buffer(pb, (unsigned char *)nsv->nsvf_index_data, table_entries * sizeof(uint32_t));
356    }
357
358    PRINT(("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    PRINT(("NSV %d INDEX ENTRIES:\n", table_entries));
364    PRINT(("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->nsvf_index_data[i], SEEK_SET);
368        get_buffer(pb, b, 8);
369        PRINT(("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->nsvf_index_data[i], size + nsv->nsvf_index_data[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
387static int nsv_parse_NSVs_header(AVFormatContext *s, AVFormatParameters *ap)
388{
389    NSVContext *nsv = s->priv_data;
390    ByteIOContext *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    PRINT(("%s()\n", __FUNCTION__));
398
399    vtag = get_le32(pb);
400    atag = get_le32(pb);
401    vwidth = get_le16(pb);
402    vheight = get_le16(pb);
403    i = get_byte(pb);
404
405    PRINT(("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 = get_le16(pb);
424    nsv->framerate = framerate;
425#ifdef DEBUG
426    print_tag("NSV NSVs vtag", vtag, 0);
427    print_tag("NSV NSVs atag", atag, 0);
428    PRINT(("NSV NSVs vsize %dx%d\n", vwidth, vheight));
429#endif
430
431    /* XXX change to ap != NULL ? */
432    if (s->nb_streams == 0) { /* streams not yet published, let's do that */
433        nsv->vtag = vtag;
434        nsv->atag = atag;
435        nsv->vwidth = vwidth;
436        nsv->vheight = vwidth;
437        if (vtag != T_NONE) {
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 = CODEC_TYPE_VIDEO;
447            st->codec->codec_tag = vtag;
448            st->codec->codec_id = 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        if (atag != T_NONE) {
458#ifndef DISABLE_AUDIO
459            st = av_new_stream(s, NSV_ST_AUDIO);
460            if (!st)
461                goto fail;
462
463            nst = av_mallocz(sizeof(NSVStream));
464            if (!nst)
465                goto fail;
466            st->priv_data = nst;
467            st->codec->codec_type = CODEC_TYPE_AUDIO;
468            st->codec->codec_tag = atag;
469            st->codec->codec_id = codec_get_id(nsv_codec_audio_tags, atag);
470
471            st->need_parsing = AVSTREAM_PARSE_FULL; /* for PCM we will read a chunk later and put correct info */
472
473            /* set timebase to common denominator of ms and framerate */
474            av_set_pts_info(st, 64, 1, framerate.num*1000);
475            st->start_time = 0;
476            st->duration = (int64_t)nsv->duration * framerate.num;
477#endif
478        }
479#ifdef CHECK_SUBSEQUENT_NSVS
480    } else {
481        if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) {
482            PRINT(("NSV NSVs header values differ from the first one!!!\n"));
483            //return -1;
484        }
485#endif /* CHECK_SUBSEQUENT_NSVS */
486    }
487
488    nsv->state = NSV_HAS_READ_NSVS;
489    return 0;
490fail:
491    /* XXX */
492    nsv->state = NSV_UNSYNC;
493    return -1;
494}
495
496static int nsv_read_header(AVFormatContext *s, AVFormatParameters *ap)
497{
498    NSVContext *nsv = s->priv_data;
499    int i, err;
500
501    PRINT(("%s()\n", __FUNCTION__));
502    PRINT(("filename '%s'\n", s->filename));
503
504    nsv->state = NSV_UNSYNC;
505    nsv->ahead[0].data = nsv->ahead[1].data = NULL;
506
507    for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
508        if (nsv_resync(s) < 0)
509            return -1;
510        if (nsv->state == NSV_FOUND_NSVF)
511            err = nsv_parse_NSVf_header(s, ap);
512            /* we need the first NSVs also... */
513        if (nsv->state == NSV_FOUND_NSVS) {
514            err = nsv_parse_NSVs_header(s, ap);
515            break; /* we just want the first one */
516        }
517    }
518    if (s->nb_streams < 1) /* no luck so far */
519        return -1;
520    /* now read the first chunk, so we can attempt to decode more info */
521    err = nsv_read_chunk(s, 1);
522
523    PRINT(("parsed header\n"));
524    return 0;
525}
526
527static int nsv_read_chunk(AVFormatContext *s, int fill_header)
528{
529    NSVContext *nsv = s->priv_data;
530    ByteIOContext *pb = s->pb;
531    AVStream *st[2] = {NULL, NULL};
532    NSVStream *nst;
533    AVPacket *pkt;
534    int i, err = 0;
535    uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */
536    uint32_t vsize;
537    uint16_t asize;
538    uint16_t auxsize;
539    uint32_t auxtag;
540
541    PRINT(("%s(%d)\n", __FUNCTION__, fill_header));
542
543    if (nsv->ahead[0].data || nsv->ahead[1].data)
544        return 0; //-1; /* hey! eat what you've in your plate first! */
545
546null_chunk_retry:
547    if (url_feof(pb))
548        return -1;
549
550    for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++)
551        err = nsv_resync(s);
552    if (err < 0)
553        return err;
554    if (nsv->state == NSV_FOUND_NSVS)
555        err = nsv_parse_NSVs_header(s, NULL);
556    if (err < 0)
557        return err;
558    if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF)
559        return -1;
560
561    auxcount = get_byte(pb);
562    vsize = get_le16(pb);
563    asize = get_le16(pb);
564    vsize = (vsize << 4) | (auxcount >> 4);
565    auxcount &= 0x0f;
566    PRINT(("NSV CHUNK %d aux, %u bytes video, %d bytes audio\n", auxcount, vsize, asize));
567    /* skip aux stuff */
568    for (i = 0; i < auxcount; i++) {
569        auxsize = get_le16(pb);
570        auxtag = get_le32(pb);
571        PRINT(("NSV aux data: '%c%c%c%c', %d bytes\n",
572              (auxtag & 0x0ff),
573              ((auxtag >> 8) & 0x0ff),
574              ((auxtag >> 16) & 0x0ff),
575              ((auxtag >> 24) & 0x0ff),
576              auxsize));
577        url_fskip(pb, auxsize);
578        vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming braindead */
579    }
580
581    if (url_feof(pb))
582        return -1;
583    if (!vsize && !asize) {
584        nsv->state = NSV_UNSYNC;
585        goto null_chunk_retry;
586    }
587
588    /* map back streams to v,a */
589    if (s->streams[0])
590        st[s->streams[0]->id] = s->streams[0];
591    if (s->streams[1])
592        st[s->streams[1]->id] = s->streams[1];
593
594    if (vsize/* && st[NSV_ST_VIDEO]*/) {
595        nst = st[NSV_ST_VIDEO]->priv_data;
596        pkt = &nsv->ahead[NSV_ST_VIDEO];
597        av_get_packet(pb, pkt, vsize);
598        pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO;
599        pkt->dts = nst->frame_offset;
600        pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
601/*
602        for (i = 0; i < MIN(8, vsize); i++)
603            PRINT(("NSV video: [%d] = %02x\n", i, pkt->data[i]));
604*/
605    }
606    if(st[NSV_ST_VIDEO])
607        ((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset++;
608
609    if (asize/*st[NSV_ST_AUDIO]*/) {
610        nst = st[NSV_ST_AUDIO]->priv_data;
611        pkt = &nsv->ahead[NSV_ST_AUDIO];
612        /* read raw audio specific header on the first audio chunk... */
613        /* on ALL audio chunks ?? seems so! */
614        if (asize && st[NSV_ST_AUDIO]->codec->codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) {
615            uint8_t bps;
616            uint8_t channels;
617            uint16_t samplerate;
618            bps = get_byte(pb);
619            channels = get_byte(pb);
620            samplerate = get_le16(pb);
621            asize-=4;
622            PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate));
623            if (fill_header) {
624                st[NSV_ST_AUDIO]->need_parsing = AVSTREAM_PARSE_NONE; /* we know everything */
625                if (bps != 16) {
626                    PRINT(("NSV AUDIO bit/sample != 16 (%d)!!!\n", bps));
627                }
628                bps /= channels; // ???
629                if (bps == 8)
630                    st[NSV_ST_AUDIO]->codec->codec_id = CODEC_ID_PCM_U8;
631                samplerate /= 4;/* UGH ??? XXX */
632                channels = 1;
633                st[NSV_ST_AUDIO]->codec->channels = channels;
634                st[NSV_ST_AUDIO]->codec->sample_rate = samplerate;
635                PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate));
636            }
637        }
638        av_get_packet(pb, pkt, asize);
639        pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO;
640        pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
641        if( nsv->state == NSV_HAS_READ_NSVS && st[NSV_ST_VIDEO] ) {
642            /* on a nsvs frame we have new information on a/v sync */
643            pkt->dts = (((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset-1);
644            pkt->dts *= (int64_t)1000        * nsv->framerate.den;
645            pkt->dts += (int64_t)nsv->avsync * nsv->framerate.num;
646            PRINT(("NSV AUDIO: sync:%d, dts:%"PRId64, nsv->avsync, pkt->dts));
647        }
648        nst->frame_offset++;
649    }
650
651    nsv->state = NSV_UNSYNC;
652    return 0;
653}
654
655
656static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
657{
658    NSVContext *nsv = s->priv_data;
659    int i, err = 0;
660
661    PRINT(("%s()\n", __FUNCTION__));
662
663    /* in case we don't already have something to eat ... */
664    if (nsv->ahead[0].data == NULL && nsv->ahead[1].data == NULL)
665        err = nsv_read_chunk(s, 0);
666    if (err < 0)
667        return err;
668
669    /* now pick one of the plates */
670    for (i = 0; i < 2; i++) {
671        if (nsv->ahead[i].data) {
672                PRINT(("%s: using cached packet[%d]\n", __FUNCTION__, i));
673            /* avoid the cost of new_packet + memcpy(->data) */
674            memcpy(pkt, &nsv->ahead[i], sizeof(AVPacket));
675            nsv->ahead[i].data = NULL; /* we ate that one */
676            return pkt->size;
677        }
678    }
679
680    /* this restaurant is not approvisionned :^] */
681    return -1;
682}
683
684static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
685{
686#if 0
687    NSVContext *avi = s->priv_data;
688    AVStream *st;
689    NSVStream *ast;
690    int frame_number, i;
691    int64_t pos;
692#endif
693
694    return -1;
695}
696
697static int nsv_read_close(AVFormatContext *s)
698{
699/*     int i; */
700    NSVContext *nsv = s->priv_data;
701
702    if (nsv->index_entries)
703        av_free(nsv->nsvf_index_data);
704
705#if 0
706
707    for(i=0;i<s->nb_streams;i++) {
708        AVStream *st = s->streams[i];
709        NSVStream *ast = st->priv_data;
710        if(ast){
711            av_free(ast->index_entries);
712            av_free(ast);
713        }
714        av_free(st->codec->palctrl);
715    }
716
717#endif
718    return 0;
719}
720
721static int nsv_probe(AVProbeData *p)
722{
723    int i;
724//    PRINT(("nsv_probe(), buf_size %d\n", p->buf_size));
725    /* check file header */
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] == 'f' || 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/2;
742    /* FIXME: add mime-type check */
743    return 0;
744}
745
746AVInputFormat nsv_demuxer = {
747    "nsv",
748    NULL_IF_CONFIG_SMALL("Nullsoft Streaming Video"),
749    sizeof(NSVContext),
750    nsv_probe,
751    nsv_read_header,
752    nsv_read_packet,
753    nsv_read_close,
754    nsv_read_seek,
755};
756