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FFmpeg/libavformat/nsvdec.c

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/*
* NSV demuxer
* Copyright (c) 2004 The FFmpeg Project.
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avformat.h"
#include "riff.h"
//#define DEBUG
//#define DEBUG_DUMP_INDEX // XXX dumbdriving-271.nsv breaks with it commented!!
//#define DEBUG_SEEK
#define CHECK_SUBSEQUENT_NSVS
//#define DISABLE_AUDIO
/* max bytes to crawl for trying to resync
* stupid streaming servers don't start at chunk boundaries...
*/
#define NSV_MAX_RESYNC (500*1024)
#define NSV_MAX_RESYNC_TRIES 300
/*
* First version by Francois Revol - revol@free.fr
* References:
* (1) http://www.multimedia.cx/nsv-format.txt
* seems someone came to the same conclusions as me, and updated it:
* (2) http://www.stud.ktu.lt/~vitslav/nsv/nsv-format.txt
* http://www.stud.ktu.lt/~vitslav/nsv/
* Sample files:
* (S1) http://www.nullsoft.com/nsv/samples/
* http://www.nullsoft.com/nsv/samples/faster.nsv
* http://streamripper.sourceforge.net/openbb/read.php?TID=492&page=4
*/
/*
* notes on the header (Francois Revol):
*
* It is followed by strings, then a table, but nothing tells
* where the table begins according to (1). After checking faster.nsv,
* I believe NVSf[16-19] gives the size of the strings data
* (that is the offset of the data table after the header).
* After checking all samples from (S1) all confirms this.
*
* Then, about NSVf[12-15], faster.nsf has 179700. When veiwing it in VLC,
* I noticed there was about 1 NVSs chunk/s, so I ran
* strings faster.nsv | grep NSVs | wc -l
* which gave me 180. That leads me to think that NSVf[12-15] might be the
* file length in milliseconds.
* Let's try that:
* 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
* except for nstrailer (which doesn't have an NSVf header), it repports correct time.
*
* nsvtrailer.nsv (S1) does not have any NSVf header, only NSVs chunks,
* so the header seems to not be mandatory. (for streaming).
*
* index slice duration check (excepts nsvtrailer.nsv):
* 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
*/
/*
* TODO:
* - handle timestamps !!!
* - use index
* - mime-type in probe()
* - seek
*/
#ifdef DEBUG
#define PRINT(_v) printf _v
#else
#define PRINT(_v)
#endif
#if 0
struct NSVf_header {
uint32_t chunk_tag; /* 'NSVf' */
uint32_t chunk_size;
uint32_t file_size; /* max 4GB ??? noone learns anything it seems :^) */
uint32_t file_length; //unknown1; /* what about MSB of file_size ? */
uint32_t info_strings_size; /* size of the info strings */ //unknown2;
uint32_t table_entries;
uint32_t table_entries_used; /* the left ones should be -1 */
};
struct NSVs_header {
uint32_t chunk_tag; /* 'NSVs' */
uint32_t v4cc; /* or 'NONE' */
uint32_t a4cc; /* or 'NONE' */
uint16_t vwidth; /* assert(vwidth%16==0) */
uint16_t vheight; /* assert(vheight%16==0) */
uint8_t framerate; /* value = (framerate&0x80)?frtable[frameratex0x7f]:framerate */
uint16_t unknown;
};
struct nsv_avchunk_header {
uint8_t vchunk_size_lsb;
uint16_t vchunk_size_msb; /* value = (vchunk_size_msb << 4) | (vchunk_size_lsb >> 4) */
uint16_t achunk_size;
};
struct nsv_pcm_header {
uint8_t bits_per_sample;
uint8_t channel_count;
uint16_t sample_rate;
};
#endif
/* variation from avi.h */
/*typedef struct CodecTag {
int id;
unsigned int tag;
} CodecTag;*/
/* tags */
#define T_NSVF MKTAG('N', 'S', 'V', 'f') /* file header */
#define T_NSVS MKTAG('N', 'S', 'V', 's') /* chunk header */
#define T_TOC2 MKTAG('T', 'O', 'C', '2') /* extra index marker */
#define T_NONE MKTAG('N', 'O', 'N', 'E') /* null a/v 4CC */
#define T_SUBT MKTAG('S', 'U', 'B', 'T') /* subtitle aux data */
#define T_ASYN MKTAG('A', 'S', 'Y', 'N') /* async a/v aux marker */
#define T_KEYF MKTAG('K', 'E', 'Y', 'F') /* video keyframe aux marker (addition) */
#define TB_NSVF MKBETAG('N', 'S', 'V', 'f')
#define TB_NSVS MKBETAG('N', 'S', 'V', 's')
/* hardcoded stream indices */
#define NSV_ST_VIDEO 0
#define NSV_ST_AUDIO 1
#define NSV_ST_SUBT 2
enum NSVStatus {
NSV_UNSYNC,
NSV_FOUND_NSVF,
NSV_HAS_READ_NSVF,
NSV_FOUND_NSVS,
NSV_HAS_READ_NSVS,
NSV_FOUND_BEEF,
NSV_GOT_VIDEO,
NSV_GOT_AUDIO,
};
typedef struct NSVStream {
int frame_offset; /* current frame (video) or byte (audio) counter
(used to compute the pts) */
int scale;
int rate;
int sample_size; /* audio only data */
int start;
int new_frame_offset; /* temporary storage (used during seek) */
int cum_len; /* temporary storage (used during seek) */
} NSVStream;
typedef struct {
int base_offset;
int NSVf_end;
uint32_t *nsvf_index_data;
int index_entries;
enum NSVStatus state;
AVPacket ahead[2]; /* [v, a] if .data is !NULL there is something */
/* cached */
int64_t duration;
uint32_t vtag, atag;
uint16_t vwidth, vheight;
//DVDemuxContext* dv_demux;
} NSVContext;
static const CodecTag nsv_codec_video_tags[] = {
{ CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') },
{ CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
{ CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
{ CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') },
{ CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
{ CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
/*
{ CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') },
{ CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') },
{ CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') },
{ CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') },
{ CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') },
*/
{ CODEC_ID_XVID, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */
{ CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') },
{ 0, 0 },
};
static const CodecTag nsv_codec_audio_tags[] = {
{ CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') },
{ CODEC_ID_AAC, MKTAG('A', 'A', 'C', ' ') },
{ CODEC_ID_AAC, MKTAG('A', 'A', 'C', 'P') }, /* _CUTTED__MUXED_2 Heads - Out Of The City.nsv */
{ CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') },
{ 0, 0 },
};
static const AVRational nsv_framerate_table[] = {
{30,1},
{30000,1001},
{25,1},
{24000,1001},
{30,1},
{15000,1001},
};
//static int nsv_load_index(AVFormatContext *s);
static int nsv_read_chunk(AVFormatContext *s, int fill_header);
#ifdef DEBUG
static void print_tag(const char *str, unsigned int tag, int size)
{
printf("%s: tag=%c%c%c%c\n",
str, tag & 0xff,
(tag >> 8) & 0xff,
(tag >> 16) & 0xff,
(tag >> 24) & 0xff);
}
#endif
/* try to find something we recognize, and set the state accordingly */
static int nsv_resync(AVFormatContext *s)
{
NSVContext *nsv = s->priv_data;
ByteIOContext *pb = &s->pb;
uint32_t v = 0;
int i;
PRINT(("%s(), offset = %"PRId64", state = %d\n", __FUNCTION__, url_ftell(pb), nsv->state));
//nsv->state = NSV_UNSYNC;
for (i = 0; i < NSV_MAX_RESYNC; i++) {
if (url_feof(pb)) {
PRINT(("NSV EOF\n"));
nsv->state = NSV_UNSYNC;
return -1;
}
v <<= 8;
v |= get_byte(pb);
/*
if (i < 8) {
PRINT(("NSV resync: [%d] = %02x\n", i, v & 0x0FF));
}
*/
if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */
PRINT(("NSV resynced on BEEF after %d bytes\n", i+1));
nsv->state = NSV_FOUND_BEEF;
return 0;
}
/* we read as big endian, thus the MK*BE* */
if (v == TB_NSVF) { /* NSVf */
PRINT(("NSV resynced on NSVf after %d bytes\n", i+1));
nsv->state = NSV_FOUND_NSVF;
return 0;
}
if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */
PRINT(("NSV resynced on NSVs after %d bytes\n", i+1));
nsv->state = NSV_FOUND_NSVS;
return 0;
}
}
PRINT(("NSV sync lost\n"));
return -1;
}
static int nsv_parse_NSVf_header(AVFormatContext *s, AVFormatParameters *ap)
{
NSVContext *nsv = s->priv_data;
ByteIOContext *pb = &s->pb;
unsigned int file_size, size;
int64_t duration;
int strings_size;
int table_entries;
int table_entries_used;
PRINT(("%s()\n", __FUNCTION__));
nsv->state = NSV_UNSYNC; /* in case we fail */
size = get_le32(pb);
if (size < 28)
return -1;
nsv->NSVf_end = size;
//s->file_size = (uint32_t)get_le32(pb);
file_size = (uint32_t)get_le32(pb);
PRINT(("NSV NSVf chunk_size %u\n", size));
PRINT(("NSV NSVf file_size %u\n", file_size));
nsv->duration = duration = get_le32(pb); /* in ms */
PRINT(("NSV NSVf duration %"PRId64" ms\n", duration));
// XXX: store it in AVStreams
strings_size = get_le32(pb);
table_entries = get_le32(pb);
table_entries_used = get_le32(pb);
PRINT(("NSV NSVf info-strings size: %d, table entries: %d, bis %d\n",
strings_size, table_entries, table_entries_used));
if (url_feof(pb))
return -1;
PRINT(("NSV got header; filepos %"PRId64"\n", url_ftell(pb)));
if (strings_size > 0) {
char *strings; /* last byte will be '\0' to play safe with str*() */
char *p, *endp;
char *token, *value;
char quote;
p = strings = av_mallocz(strings_size + 1);
endp = strings + strings_size;
get_buffer(pb, strings, strings_size);
while (p < endp) {
while (*p == ' ')
p++; /* strip out spaces */
if (p >= endp-2)
break;
token = p;
p = strchr(p, '=');
if (!p || p >= endp-2)
break;
*p++ = '\0';
quote = *p++;
value = p;
p = strchr(p, quote);
if (!p || p >= endp)
break;
*p++ = '\0';
PRINT(("NSV NSVf INFO: %s='%s'\n", token, value));
if (!strcmp(token, "ASPECT")) {
/* don't care */
} else if (!strcmp(token, "CREATOR") || !strcmp(token, "Author")) {
strncpy(s->author, value, 512-1);
} else if (!strcmp(token, "Copyright")) {
strncpy(s->copyright, value, 512-1);
} else if (!strcmp(token, "TITLE") || !strcmp(token, "Title")) {
strncpy(s->title, value, 512-1);
}
}
av_free(strings);
}
if (url_feof(pb))
return -1;
PRINT(("NSV got infos; filepos %"PRId64"\n", url_ftell(pb)));
if (table_entries_used > 0) {
nsv->index_entries = table_entries_used;
if((unsigned)table_entries >= UINT_MAX / sizeof(uint32_t))
return -1;
nsv->nsvf_index_data = av_malloc(table_entries * sizeof(uint32_t));
#warning "FIXME: Byteswap buffer as needed"
get_buffer(pb, (unsigned char *)nsv->nsvf_index_data, table_entries * sizeof(uint32_t));
}
PRINT(("NSV got index; filepos %"PRId64"\n", url_ftell(pb)));
#ifdef DEBUG_DUMP_INDEX
#define V(v) ((v<0x20 || v > 127)?'.':v)
/* dump index */
PRINT(("NSV %d INDEX ENTRIES:\n", table_entries));
PRINT(("NSV [dataoffset][fileoffset]\n", table_entries));
for (i = 0; i < table_entries; i++) {
unsigned char b[8];
url_fseek(pb, size + nsv->nsvf_index_data[i], SEEK_SET);
get_buffer(pb, b, 8);
PRINT(("NSV [0x%08lx][0x%08lx]: %02x %02x %02x %02x %02x %02x %02x %02x"
"%c%c%c%c%c%c%c%c\n",
nsv->nsvf_index_data[i], size + nsv->nsvf_index_data[i],
b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7],
V(b[0]), V(b[1]), V(b[2]), V(b[3]), V(b[4]), V(b[5]), V(b[6]), V(b[7]) ));
}
//url_fseek(pb, size, SEEK_SET); /* go back to end of header */
#undef V
#endif
url_fseek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */
if (url_feof(pb))
return -1;
nsv->state = NSV_HAS_READ_NSVF;
return 0;
}
static int nsv_parse_NSVs_header(AVFormatContext *s, AVFormatParameters *ap)
{
NSVContext *nsv = s->priv_data;
ByteIOContext *pb = &s->pb;
uint32_t vtag, atag;
uint16_t vwidth, vheight;
AVRational framerate;
int i;
uint16_t unknown;
AVStream *st;
NSVStream *nst;
PRINT(("%s()\n", __FUNCTION__));
vtag = get_le32(pb);
atag = get_le32(pb);
vwidth = get_le16(pb);
vheight = get_le16(pb);
i = get_byte(pb);
/* XXX how big must the table be ? */
/* seems there is more to that... */
PRINT(("NSV NSVs framerate code %2x\n", i));
if(i&0x80) framerate= nsv_framerate_table[i & 0x7F];
else framerate= (AVRational){i, 1};
unknown = get_le16(pb);
#ifdef DEBUG
print_tag("NSV NSVs vtag", vtag, 0);
print_tag("NSV NSVs atag", atag, 0);
PRINT(("NSV NSVs vsize %dx%d\n", vwidth, vheight));
#endif
/* XXX change to ap != NULL ? */
if (s->nb_streams == 0) { /* streams not yet published, let's do that */
nsv->vtag = vtag;
nsv->atag = atag;
nsv->vwidth = vwidth;
nsv->vheight = vwidth;
if (vtag != T_NONE) {
st = av_new_stream(s, NSV_ST_VIDEO);
if (!st)
goto fail;
nst = av_mallocz(sizeof(NSVStream));
if (!nst)
goto fail;
st->priv_data = nst;
st->codec->codec_type = CODEC_TYPE_VIDEO;
st->codec->codec_tag = vtag;
st->codec->codec_id = codec_get_id(nsv_codec_video_tags, vtag);
st->codec->width = vwidth;
st->codec->height = vheight;
st->codec->bits_per_sample = 24; /* depth XXX */
av_set_pts_info(st, 64, framerate.den, framerate.num);
st->start_time = 0;
st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den);
}
if (atag != T_NONE) {
#ifndef DISABLE_AUDIO
st = av_new_stream(s, NSV_ST_AUDIO);
if (!st)
goto fail;
nst = av_mallocz(sizeof(NSVStream));
if (!nst)
goto fail;
st->priv_data = nst;
st->codec->codec_type = CODEC_TYPE_AUDIO;
st->codec->codec_tag = atag;
st->codec->codec_id = codec_get_id(nsv_codec_audio_tags, atag);
st->start_time = 0;
// st->duration = nsv->duration; //FIXME
st->need_parsing = 1; /* for PCM we will read a chunk later and put correct info */
/* XXX:FIXME */
//st->codec->channels = 2; //XXX:channels;
//st->codec->sample_rate = 1000;
//av_set_pts_info(st, 64, 1, st->codec->sample_rate);
#endif
}
#ifdef CHECK_SUBSEQUENT_NSVS
} else {
if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) {
PRINT(("NSV NSVs header values differ from the first one!!!\n"));
//return -1;
}
#endif /* CHECK_SUBSEQUENT_NSVS */
}
nsv->state = NSV_HAS_READ_NSVS;
return 0;
fail:
/* XXX */
nsv->state = NSV_UNSYNC;
return -1;
}
static int nsv_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
NSVContext *nsv = s->priv_data;
int i, err;
PRINT(("%s()\n", __FUNCTION__));
PRINT(("filename '%s'\n", s->filename));
nsv->state = NSV_UNSYNC;
nsv->ahead[0].data = nsv->ahead[1].data = NULL;
for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
if (nsv_resync(s) < 0)
return -1;
if (nsv->state == NSV_FOUND_NSVF)
err = nsv_parse_NSVf_header(s, ap);
/* we need the first NSVs also... */
if (nsv->state == NSV_FOUND_NSVS) {
err = nsv_parse_NSVs_header(s, ap);
break; /* we just want the first one */
}
}
if (s->nb_streams < 1) /* no luck so far */
return -1;
/* now read the first chunk, so we can attempt to decode more info */
err = nsv_read_chunk(s, 1);
PRINT(("parsed header\n"));
return 0;
}
static int nsv_read_chunk(AVFormatContext *s, int fill_header)
{
NSVContext *nsv = s->priv_data;
ByteIOContext *pb = &s->pb;
AVStream *st[2] = {NULL, NULL};
NSVStream *nst;
AVPacket *pkt;
int i, err = 0;
uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */
uint32_t vsize;
uint16_t asize;
uint16_t auxsize;
uint32_t auxtag;
PRINT(("%s(%d)\n", __FUNCTION__, fill_header));
if (nsv->ahead[0].data || nsv->ahead[1].data)
return 0; //-1; /* hey! eat what you've in your plate first! */
null_chunk_retry:
if (url_feof(pb))
return -1;
for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++)
err = nsv_resync(s);
if (err < 0)
return err;
if (nsv->state == NSV_FOUND_NSVS)
err = nsv_parse_NSVs_header(s, NULL);
if (err < 0)
return err;
if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF)
return -1;
auxcount = get_byte(pb);
vsize = get_le16(pb);
asize = get_le16(pb);
vsize = (vsize << 4) | (auxcount >> 4);
auxcount &= 0x0f;
PRINT(("NSV CHUNK %d aux, %u bytes video, %d bytes audio\n", auxcount, vsize, asize));
/* skip aux stuff */
for (i = 0; i < auxcount; i++) {
auxsize = get_le16(pb);
auxtag = get_le32(pb);
PRINT(("NSV aux data: '%c%c%c%c', %d bytes\n",
(auxtag & 0x0ff),
((auxtag >> 8) & 0x0ff),
((auxtag >> 16) & 0x0ff),
((auxtag >> 24) & 0x0ff),
auxsize));
url_fskip(pb, auxsize);
vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming braindead */
}
if (url_feof(pb))
return -1;
if (!vsize && !asize) {
nsv->state = NSV_UNSYNC;
goto null_chunk_retry;
}
/* map back streams to v,a */
if (s->streams[0])
st[s->streams[0]->id] = s->streams[0];
if (s->streams[1])
st[s->streams[1]->id] = s->streams[1];
if (vsize/* && st[NSV_ST_VIDEO]*/) {
nst = st[NSV_ST_VIDEO]->priv_data;
pkt = &nsv->ahead[NSV_ST_VIDEO];
av_get_packet(pb, pkt, vsize);
pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO;
pkt->dts = nst->frame_offset++;
pkt->flags |= PKT_FLAG_KEY; /* stupid format has no way to tell XXX: try the index */
/*
for (i = 0; i < MIN(8, vsize); i++)
PRINT(("NSV video: [%d] = %02x\n", i, pkt->data[i]));
*/
}
if (asize/*st[NSV_ST_AUDIO]*/) {
nst = st[NSV_ST_AUDIO]->priv_data;
pkt = &nsv->ahead[NSV_ST_AUDIO];
/* read raw audio specific header on the first audio chunk... */
/* on ALL audio chunks ?? seems so! */
if (asize && st[NSV_ST_AUDIO]->codec->codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) {
uint8_t bps;
uint8_t channels;
uint16_t samplerate;
bps = get_byte(pb);
channels = get_byte(pb);
samplerate = get_le16(pb);
asize-=4;
PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate));
if (fill_header) {
st[NSV_ST_AUDIO]->need_parsing = 0; /* we know everything */
if (bps != 16) {
PRINT(("NSV AUDIO bit/sample != 16 (%d)!!!\n", bps));
}
bps /= channels; // ???
if (bps == 8)
st[NSV_ST_AUDIO]->codec->codec_id = CODEC_ID_PCM_U8;
samplerate /= 4;/* UGH ??? XXX */
channels = 1;
st[NSV_ST_AUDIO]->codec->channels = channels;
st[NSV_ST_AUDIO]->codec->sample_rate = samplerate;
av_set_pts_info(st[NSV_ST_AUDIO], 64, 1,
st[NSV_ST_AUDIO]->codec->sample_rate);
PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate));
}
}
av_get_packet(pb, pkt, asize);
pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO;
//pkt->dts = nst->frame_offset;
//if (nst->sample_size)
// pkt->dts /= nst->sample_size;
nst->frame_offset += asize; // XXX: that's valid only for PCM !?
}
//pkt->flags |= PKT_FLAG_KEY;
nsv->state = NSV_UNSYNC;
return 0;
}
static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
{
NSVContext *nsv = s->priv_data;
int i, err = 0;
PRINT(("%s()\n", __FUNCTION__));
/* in case we don't already have something to eat ... */
if (nsv->ahead[0].data == NULL && nsv->ahead[1].data == NULL)
err = nsv_read_chunk(s, 0);
if (err < 0)
return err;
/* now pick one of the plates */
for (i = 0; i < 2; i++) {
if (nsv->ahead[i].data) {
PRINT(("%s: using cached packet[%d]\n", __FUNCTION__, i));
/* avoid the cost of new_packet + memcpy(->data) */
memcpy(pkt, &nsv->ahead[i], sizeof(AVPacket));
nsv->ahead[i].data = NULL; /* we ate that one */
return pkt->size;
}
}
/* this restaurant is not approvisionned :^] */
return -1;
}
static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
{
#if 0
NSVContext *avi = s->priv_data;
AVStream *st;
NSVStream *ast;
int frame_number, i;
int64_t pos;
#endif
return -1;
}
static int nsv_read_close(AVFormatContext *s)
{
/* int i; */
NSVContext *nsv = s->priv_data;
if (nsv->index_entries)
av_free(nsv->nsvf_index_data);
#if 0
for(i=0;i<s->nb_streams;i++) {
AVStream *st = s->streams[i];
NSVStream *ast = st->priv_data;
if(ast){
av_free(ast->index_entries);
av_free(ast);
}
av_free(st->codec->palctrl);
}
#endif
return 0;
}
static int nsv_probe(AVProbeData *p)
{
int i;
// PRINT(("nsv_probe(), buf_size %d\n", p->buf_size));
/* check file header */
if (p->buf_size <= 32)
return 0;
if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
p->buf[2] == 'V' && p->buf[3] == 'f')
return AVPROBE_SCORE_MAX;
/* streamed files might not have any header */
if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
p->buf[2] == 'V' && p->buf[3] == 's')
return AVPROBE_SCORE_MAX;
/* XXX: do streamed files always start at chunk boundary ?? */
/* or do we need to search NSVs in the byte stream ? */
/* seems the servers don't bother starting clean chunks... */
/* sometimes even the first header is at 9KB or something :^) */
for (i = 1; i < p->buf_size - 3; i++) {
if (p->buf[i+0] == 'N' && p->buf[i+1] == 'S' &&
p->buf[i+2] == 'V' && p->buf[i+3] == 's')
return AVPROBE_SCORE_MAX-20;
}
/* so we'll have more luck on extension... */
if (match_ext(p->filename, "nsv"))
return AVPROBE_SCORE_MAX-20;
/* FIXME: add mime-type check */
return 0;
}
AVInputFormat nsv_demuxer = {
"nsv",
"NullSoft Video format",
sizeof(NSVContext),
nsv_probe,
nsv_read_header,
nsv_read_packet,
nsv_read_close,
nsv_read_seek,
};