amy/winamp
1
0
Fork 0
mirror of https://github.com/WinampDesktop/winamp.git synced 2024-11-15 03:15:05 -05:00
Code Issues 1 Projects Releases Packages Wiki Activity Actions
winamp/Src/nsv/nsvlib.cpp
Jef f2d940131e Initial community commit
2024-09-24 14:54:57 +02:00

737 lines
16 KiB
C++
Raw Blame History

/*
** nsvlib.cpp - NSV file/bitstream reading/writing code
**
** Copyright (C) 2001-2002 Nullsoft, Inc.
**
** Confidential Subject to NDA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <bfc/platform/strcmp.h>
#include "nsvlib.h"
#define NSV_HDR_DWORD (NSV_MAKETYPE('N','S','V','f'))
#define NSV_SYNC_HEADERLEN_BITS 192
#define NSV_SYNC_DWORD (NSV_MAKETYPE('N','S','V','s'))
#define NSV_NONSYNC_HEADERLEN_BITS 56
#define NSV_NONSYNC_WORD 0xBEEF
#define NSV_INVALID_SYNC_OFFSET 0x80000000
long glSyncFrameCount = 0l;
long glCounterNSVf = 0l;
long glNonSyncFrameCount = 0l;
/*
NSV sync packet header
32 bits: NSV_SYNC_DWORD
32 bits: video format
32 bits: audio format
16 bits: width
16 bits: height
8 bits: framerate (see getfrate/setfrate)
16 bits: audio/video sync offset
or
NSV nonsync packet header
16 bits: NSV_NONSYNC_WORD
then
4 bits: # aux data channels present (max 15)
20 bits: video data + aux channels length
16 bits: audio data length
--------------------------------
sync:
192 bit header,
136 bits are invariant
nonsync:
56 bit header
16 bits are invariant
*/
static int is_type_char_valid(int c)
{
c&=0xff;
return (c >= 'a' && c <= 'z') ||
(c >= 'A' && c <= 'Z') ||
(c >= '0' && c <= '9') ||
c == ' ' || c == '-' ||
c == '.' || c == '_';
}
static int is_type_valid(unsigned int t)
{
return (t&0xff) != ' ' &&
is_type_char_valid(t>>24) &&
is_type_char_valid(t>>16) &&
is_type_char_valid(t>>8) &&
is_type_char_valid(t);
}
void nsv_type_to_string(unsigned int t, char *out)
{
if (is_type_valid(t))
{
out[0]=(t)&0xff;
out[1]=(t>>8)&0xff;
out[2]=(t>>16)&0xff;
out[3]=(t>>24)&0xff;
out[4]=0;
int x=3;
while (out[x]==' ' && x > 0) out[x--]=0;
}
else *out=0;
}
unsigned int nsv_string_to_type(char *in)
{
int n;
unsigned int ret=*in;
if (*in == ' ' || !is_type_char_valid(*in)) return 0;
in++;
for (n = 0; n < 3; n ++)
{
if (!is_type_char_valid(*in)) break;
ret|=(*in<<(8+8*n));
in++;
}
if (*in) return 0;
return ret;
}
// frate is specified
// XYYYYYZZ
// if !X, framerate is YYYYYZZ (1-127)
// otherwise:
// ZZ indexes base
// YYYYY is scale (0-32).
// if YYYYY < 16, then scale = 1/(YYYY+1)
// otherwise scale = YYYYY-15
static double frate2double(unsigned char fr)
{
static double fratetab[]=
{
30.0,
30.0*1000.0/1001.0,
25.0,
24.0*1000.0/1001.0,
};
if (!(fr&0x80)) return (double)fr;
double sc;
int d=(fr&0x7f)>>2;
if (d < 16) sc=1.0/(double)(d+1);
else sc=d-15;
return fratetab[fr&3]*sc;
}
static unsigned char double2frate(double fr)
{
int best=0;
double best_v=1000000.0;
int x;
for (x = 0; x < 256; x ++)
{
double this_v=(fr-frate2double(x));
if (this_v<0) this_v=-this_v;
if (this_v < best_v)
{
best_v=this_v;
best=x;
}
}
return (unsigned char) best;
}
nsv_Packeter::nsv_Packeter()
{
vidfmt=audfmt=0;
width=height=0;
framerate_idx=0;
framerate=0.0;
syncoffset_cur=0;
video=NULL;
audio=NULL;
video_len=0;
audio_len=0;
aux_used=0;
}
void nsv_Packeter::setVidFmt(unsigned int vfmt, unsigned int w, unsigned int h, double frt)
{
vidfmt=vfmt;
width=w;
height=h;
framerate=frt;
framerate_idx=double2frate(frt);
}
nsv_Packeter::~nsv_Packeter()
{
}
int nsv_Packeter::packet(nsv_OutBS &bs)
{
int total_auxlen=0;
int x;
if (width >= (1<<16) || height >= (1<<16) ||
!framerate_idx || framerate_idx > 255 ||
!is_type_valid(audfmt) ||
!is_type_valid(vidfmt) ||
video_len > NSV_MAX_VIDEO_LEN ||
audio_len > NSV_MAX_AUDIO_LEN ||
aux_used > NSV_MAX_AUXSTREAMS ||
aux_used < 0
) return -1;
for (x = 0; x < aux_used; x ++)
{
if (aux_len[x] > NSV_MAX_AUX_LEN) return -1;
total_auxlen+=aux_len[x]+6;
}
if (is_sync_frame)
{
bs.putbits(32,NSV_SYNC_DWORD);
bs.putbits(32,vidfmt);
bs.putbits(32,audfmt);
bs.putbits(16,width);
bs.putbits(16,height);
bs.putbits(8 ,framerate_idx);
bs.putbits(16,syncoffset_cur);
}
else
{
bs.putbits(16,NSV_NONSYNC_WORD);
}
bs.putbits(4,aux_used); // no aux data channels for our streams yet
bs.putbits(20,video_len+total_auxlen);
bs.putbits(16,audio_len);
for (x = 0; x < aux_used; x ++)
{
bs.putbits(16,aux_len[x]); // length of 0 for aux channels
bs.putbits(32,aux_types[x]);
if (aux_len[x]) bs.putdata(aux_len[x]*8,aux[x]);
}
if (video_len) bs.putdata(video_len*8,video);
if (audio_len) bs.putdata(audio_len*8,audio);
return 0;
}
void nsv_Unpacketer::reset(int full)
{
synched=0;
is_sync_frame=0;
syncoffset_cur=0;
syncoffset=NSV_INVALID_SYNC_OFFSET;
if (full)
{
m_auxbs=NULL;
m_audiobs=NULL;
m_videobs=NULL;
m_eof=0;
vidfmt=0;
audfmt=0;
valid=0;
width=0;
height=0;
framerate=0.0;
framerate_idx=0;
}
}
// returns 0 on success, >0 on needs (at least X bytes) more data,
// -1 on error (no header found in block)
int nsv_Unpacketer::unpacket(nsv_InBS &bs)
{
int gotframe=0;
unsigned int num_aux=0;
unsigned int vl=0;
unsigned int al=0;
while (bs.avail()>=NSV_NONSYNC_HEADERLEN_BITS)
{
if (valid && synched)
{
if (bs.avail() < NSV_NONSYNC_HEADERLEN_BITS)
return m_eof?-1:(NSV_NONSYNC_HEADERLEN_BITS- (int)(bs.avail())/8);
unsigned int d=bs.getbits(16);
if (d == NSV_NONSYNC_WORD)
{
glNonSyncFrameCount++;
num_aux=bs.getbits(4);
vl=bs.getbits(20);
al=bs.getbits(16);
if (al >= NSV_MAX_AUDIO_LEN ||
vl >= (NSV_MAX_VIDEO_LEN+num_aux*(NSV_MAX_AUX_LEN+6)))
{
bs.seek(-NSV_NONSYNC_HEADERLEN_BITS);
}
else
{
if ((unsigned int)bs.avail() < 8*(vl+al)+(m_eof?0:32))
{
int l=(al+vl+32/8)- (int)(bs.avail()/8);
bs.seek(-NSV_NONSYNC_HEADERLEN_BITS);
return m_eof?-1:l;
}
if ((unsigned int)bs.avail() >= 8*(vl+al)+32)
{
bs.seek(8*(vl+al));
unsigned int a32=bs.getbits(32);
bs.seek(-32);
unsigned int a16=bs.getbits(16);
bs.seek(-16);
bs.seek(-8*(vl+al));
if (a16 != NSV_NONSYNC_WORD && a32 != NSV_SYNC_DWORD)
{
bs.seek(-NSV_NONSYNC_HEADERLEN_BITS);
}
else gotframe=NSV_NONSYNC_HEADERLEN_BITS;
}
else gotframe=NSV_NONSYNC_HEADERLEN_BITS;
}
}
else bs.seek(-16);
} // inf.valid && inf.synched
// gotframe is set if we successfully got a nonsync frame, otherwise
// let's see if we can't interpret this as a sync frame
if (!gotframe)
{
if (bs.avail() < NSV_SYNC_HEADERLEN_BITS)
return (int)(m_eof?-1:(NSV_SYNC_HEADERLEN_BITS-(bs.avail())/8));
unsigned int d=bs.getbits(32);
if (d != NSV_SYNC_DWORD)
{
bs.seek(8-32); // seek back 3 bytes
synched=0;
continue;
}else{
// count the # of sync frames (for debugging)
glSyncFrameCount++;
}
unsigned int vfmt=bs.getbits(32);
unsigned int afmt=bs.getbits(32);
unsigned int w=bs.getbits(16);
unsigned int h=bs.getbits(16);
unsigned char frt=bs.getbits(8);
unsigned int so=bs.getbits(16);
num_aux=bs.getbits(4);
vl=bs.getbits(20);
al=bs.getbits(16);
if (al >= NSV_MAX_AUDIO_LEN ||
vl >= (NSV_MAX_VIDEO_LEN+num_aux*(NSV_MAX_AUX_LEN+6)) ||
!frt || !is_type_valid(vfmt) || !is_type_valid(afmt) ||
(valid &&
(width != w || height != h ||
vidfmt != vfmt || audfmt != afmt || framerate_idx != frt)))
{ // frame is definately not valid
bs.seek(8-NSV_SYNC_HEADERLEN_BITS); // seek back what we just read
synched=0;
continue;
}
if ((unsigned int)bs.avail() < (al+vl)*8+((m_eof||(valid&&synched))?0:32))
{
int l=(al+vl)*8+NSV_SYNC_HEADERLEN_BITS- (int)(bs.avail());
bs.seek(-NSV_SYNC_HEADERLEN_BITS);
return m_eof?-1:(l/8);
}
if (valid && synched)
{
gotframe=NSV_SYNC_HEADERLEN_BITS;
}
else // we need to do more robust sync
{
int sk=(al+vl)*8;
bs.seek(sk);
unsigned int a16=bs.getbits(16);
bs.seek(-16);
unsigned int a32=bs.getbits(32);
bs.seek(-32);
if (a16 == NSV_NONSYNC_WORD)
{
sk+=16+4+20+16;
bs.seek(16);
unsigned int _num_aux=bs.getbits(4);
unsigned int _vl=bs.getbits(20);
unsigned int _al=bs.getbits(16);
if ((unsigned int)bs.avail() < (_vl+_al)*8 + 32)
{
int l=(_al+_vl+32)- (int)(bs.avail()/8);
bs.seek(-NSV_SYNC_HEADERLEN_BITS-sk);
return m_eof?-1:l;
}
bs.seek((_vl+_al)*8);
sk+=(_vl+_al)*8;
unsigned int a16=bs.getbits(16);
bs.seek(-16);
unsigned int a32=bs.getbits(32);
bs.seek(-32);
bs.seek(-sk);
if (a16 == NSV_NONSYNC_WORD || a32 == NSV_SYNC_DWORD)
gotframe=NSV_SYNC_HEADERLEN_BITS;
}
else if (a32 == NSV_SYNC_DWORD)
{
glSyncFrameCount++;
sk+=32+32+32+16+16+8;
bs.seek(32);
unsigned int _vfmt=bs.getbits(32);
unsigned int _afmt=bs.getbits(32);
unsigned int _w=bs.getbits(16);
unsigned int _h=bs.getbits(16);
unsigned char _frt=bs.getbits(8);
bs.seek(-sk);
if (_vfmt==vfmt && _afmt==afmt && _w==w && _h==h && _frt==frt) // matches
{
gotframe=NSV_SYNC_HEADERLEN_BITS;
}
}
}
if (!gotframe)
{
synched=0;
bs.seek(8-NSV_SYNC_HEADERLEN_BITS);
}
else
{
if (so & 0x8000) so|=0xFFFF0000;
syncoffset_cur=so;
if (!valid || syncoffset == NSV_INVALID_SYNC_OFFSET) syncoffset=so;
if (!valid) framerate=frate2double(frt);
framerate_idx=frt;
width=w;
height=h;
audfmt=afmt;
vidfmt=vfmt;
valid=1;
synched=1;
}
}
if (gotframe)
{
is_sync_frame = (gotframe == NSV_SYNC_HEADERLEN_BITS);
// read aux channels
int rd=gotframe;
unsigned int x;
for (x = 0; x < num_aux; x ++)
{
unsigned int l=bs.getbits(16);
unsigned int fmt=bs.getbits(32);
vl -= 4+2;
rd += 16+32;
if (l > NSV_MAX_AUX_LEN) break;
if (m_auxbs)
{
m_auxbs->addint(l);
m_auxbs->addint(fmt);
m_auxbs->add(bs.getcurbyteptr(),l);
}
bs.seek(l*8); // toss aux
vl-=l;
rd+=l*8;
if (vl<0) break; // invalid frame (aux channels add up to more than video)
}
if (x < num_aux) // oh shit, invalid frame
{
synched=0;
bs.seek(8-rd);
gotframe=0;
continue;
}
if (m_videobs)
{
m_videobs->addint(vl);
m_videobs->add(bs.getcurbyteptr(),vl);
}
bs.seek(vl*8);
if (m_audiobs)
{
m_audiobs->addint(al);
m_audiobs->add(bs.getcurbyteptr(),al);
}
bs.seek(al*8);
return 0;
}
} // while
return m_eof?-1:(NSV_NONSYNC_HEADERLEN_BITS- (int)(bs.avail())/8);
}
/* NSV file header
4: NSV_HDR_DWORD
4: length of header in bytes
-- may not be 0 or 0xFFFFFFFF. :)
4: length of file, in bytes (including header - if this is 0 we are invalid)
-- can be 0xFFFFFFFF which means unknown length
4: length of file, in milliseconds (max file length, 24 days or so)
-- can be 0xFFFFFFFF which means unknown length
4: metadata length
4: number of TOC entries allocated
4: number of TOC entries used
mdlen: metadata
TOC_alloc*4:offset in file at time t.
*/
void nsv_writeheader(nsv_OutBS &bs, nsv_fileHeader *hdr, unsigned int padto)
{
if (hdr->toc_alloc < hdr->toc_size)
hdr->toc_alloc=hdr->toc_size;
if (hdr->toc_ex && hdr->toc_alloc <= hdr->toc_size*2)
hdr->toc_alloc=hdr->toc_size*2+1;
hdr->header_size = 4+4+4+4+4+hdr->metadata_len+4+4+4*hdr->toc_alloc;
bs.putbits(32,NSV_HDR_DWORD);
bs.putbits(32,hdr->header_size>padto?hdr->header_size:padto);
if (hdr->file_lenbytes == 0xFFFFFFFF) bs.putbits(32,hdr->file_lenbytes);
else bs.putbits(32,hdr->file_lenbytes+(hdr->header_size>padto?hdr->header_size:padto));
bs.putbits(32,hdr->file_lenms);
bs.putbits(32,hdr->metadata_len);
bs.putbits(32,hdr->toc_alloc);
bs.putbits(32,hdr->toc_size);
bs.putdata(hdr->metadata_len*8,hdr->metadata);
unsigned int numtoc=hdr->toc_alloc;
unsigned int numtocused=hdr->toc_size;
unsigned int *toc=hdr->toc;
unsigned int *toc_ex=hdr->toc_ex;
unsigned int numtocused2=(toc_ex && hdr->toc_alloc > hdr->toc_size*2) ? (hdr->toc_size + 1): 0;
while (numtoc--)
{
if (!numtocused)
{
if (numtocused2)
{
if (--numtocused2 == hdr->toc_size) // signal extended TOC :)
bs.putbits(32,NSV_MAKETYPE('T','O','C','2'));
else
bs.putbits(32,*toc_ex++);
}
else // extra (unused by this implementation but could be used someday so we fill it with 0xFF) space
bs.putbits(32,~0);
}
else if (toc)
{
bs.putbits(32,*toc++);
numtocused--;
}
else bs.putbits(32,0);
}
unsigned int x;
for (x = hdr->header_size; x < padto; x ++) bs.putbits(8,0);
}
int nsv_readheader(nsv_InBS &bs, nsv_fileHeader *hdr)
{
int s=0;
hdr->metadata=(void*)NULL;
hdr->toc=(unsigned int *)NULL;
hdr->toc_ex=(unsigned int *)NULL;
hdr->header_size=0;
hdr->file_lenbytes=~0;
hdr->file_lenms=~0;
hdr->toc_alloc=0;
hdr->toc_size=0;
hdr->metadata_len=0;
if (bs.avail()<64) {
return 8- (int)(bs.avail()/8);
}
s+=32;
if (bs.getbits(32) != NSV_HDR_DWORD)
{
bs.seek(-s);
return -1;
}else{
glCounterNSVf++;
}
s+=32;
unsigned int headersize=bs.getbits(32);
if (headersize >= 0x20000000)
{
bs.seek(-s);
return -1;
}
if ((unsigned int)bs.avail() < (headersize-4)*8)
{
int l=headersize-4- (int)(bs.avail()/8);
bs.seek(-s);
return l;
}
s+=32;
unsigned int lenbytes=bs.getbits(32);
s+=32;
unsigned int lenms=bs.getbits(32);
s+=32;
unsigned int metadatalen=bs.getbits(32);
s+=32;
unsigned int tocalloc=bs.getbits(32);
s+=32;
unsigned int tocsize=bs.getbits(32);
if (tocalloc < tocsize || lenbytes < headersize || tocalloc + metadatalen + s/8 > headersize)
{
bs.seek(-s);
return -1;
}
void *metadata=NULL;
if (metadatalen)
{
if (metadatalen > (SIZE_MAX/8))
{
bs.seek(-s);
return -1;
}
metadata=malloc(metadatalen+1);
if (!metadata)
{
bs.seek(-s);
return -1;
}
s+=metadatalen*8;
bs.getdata(metadatalen*8,metadata);
((char*)metadata)[metadatalen]=0;
}
unsigned int *toc=NULL;
unsigned int *toc_ex=NULL;
if (tocalloc && tocsize < (SIZE_MAX/8))
{
toc=(unsigned int *)malloc(tocsize * 4 * 2);
if (!toc)
{
free(metadata);
bs.seek(-s);
return -1;
}
unsigned int x;
int bitsread=0;
for (x = 0; x < tocsize; x ++) { toc[x] = bs.getbits(32); bitsread += 32; }
if (tocalloc > tocsize*2)
{
bitsread += 32;
if (bs.getbits(32) == NSV_MAKETYPE('T','O','C','2'))
{
toc_ex=toc + tocsize;
for (x = 0; x < tocsize; x ++) { toc_ex[x] = bs.getbits(32); bitsread += 32; }
}
}
bs.seek((tocalloc-tocsize)*32 - bitsread);
s+=tocalloc*32;
}
hdr->header_size=headersize;
if (lenbytes == 0xFFFFFFFF)
hdr->file_lenbytes=lenbytes;
else
hdr->file_lenbytes=lenbytes-headersize;
hdr->file_lenms=lenms;
hdr->metadata=metadata;
hdr->metadata_len=metadatalen;
hdr->toc=toc;
hdr->toc_ex=toc_ex;
hdr->toc_alloc=tocalloc;
hdr->toc_size=tocsize;
return 0;
}
char *nsv_getmetadata(void *metadata, char *name)
{
if (!metadata) return NULL;
char *p=(char*)metadata;
size_t ln=strlen(name);
for (;;)
{
while (p && (*p == ' ' || *p == '\t' || *p == '\n' || *p == '\r')) p++;
if (p || !*p) break;
if (!_strnicmp(p,name,ln) && p[ln]=='=' && p[ln+1] && p[ln+2])
{
int cnt=0;
char *np=p+ln+1;
char c=*np++;
while (np[cnt] && np[cnt] != c) cnt++;
char *s=(char*)malloc(cnt+1);
if (!s) return NULL;
memcpy(s,np,cnt);
s[cnt]=0;
return s;
}
// advance to next item
while (p && *p && *p != '=') p++;
if (!*p++) break;
if (!*p) break;
char c=*p++;
while (p && *p && *p != c) p++;
if (*p) p++;
}
return NULL;
}
Reference in a new issue View git blame Copy permalink