mirror of
https://github.com/mpv-player/mpv
synced 2024-12-22 06:42:03 +00:00
00e49dd038
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@15251 b3059339-0415-0410-9bf9-f77b7e298cf2
451 lines
9.7 KiB
C
451 lines
9.7 KiB
C
/********************************************************************
|
|
* *
|
|
* THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
|
|
* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
|
|
* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
|
|
* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
|
|
* *
|
|
* THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2002 *
|
|
* by the Xiph.Org Foundation http://www.xiph.org/ *
|
|
* *
|
|
********************************************************************
|
|
|
|
function: packing variable sized words into an octet stream
|
|
last mod: $Id$
|
|
|
|
********************************************************************/
|
|
|
|
/* We're 'LSb' endian; if we write a word but read individual bits,
|
|
then we'll read the lsb first */
|
|
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include "ogg.h"
|
|
|
|
#define BUFFER_INCREMENT 256
|
|
|
|
static const unsigned long mask[]=
|
|
{0x00000000,0x00000001,0x00000003,0x00000007,0x0000000f,
|
|
0x0000001f,0x0000003f,0x0000007f,0x000000ff,0x000001ff,
|
|
0x000003ff,0x000007ff,0x00000fff,0x00001fff,0x00003fff,
|
|
0x00007fff,0x0000ffff,0x0001ffff,0x0003ffff,0x0007ffff,
|
|
0x000fffff,0x001fffff,0x003fffff,0x007fffff,0x00ffffff,
|
|
0x01ffffff,0x03ffffff,0x07ffffff,0x0fffffff,0x1fffffff,
|
|
0x3fffffff,0x7fffffff,0xffffffff };
|
|
|
|
static const unsigned int mask8B[]=
|
|
{0x00,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff};
|
|
|
|
void oggpack_writeinit(oggpack_buffer *b){
|
|
memset(b,0,sizeof(*b));
|
|
b->ptr=b->buffer=_ogg_malloc(BUFFER_INCREMENT);
|
|
b->buffer[0]='\0';
|
|
b->storage=BUFFER_INCREMENT;
|
|
}
|
|
|
|
void oggpackB_writeinit(oggpack_buffer *b){
|
|
oggpack_writeinit(b);
|
|
}
|
|
|
|
void oggpack_writetrunc(oggpack_buffer *b,long bits){
|
|
long bytes=bits>>3;
|
|
bits-=bytes*8;
|
|
b->ptr=b->buffer+bytes;
|
|
b->endbit=bits;
|
|
b->endbyte=bytes;
|
|
*b->ptr&=mask[bits];
|
|
}
|
|
|
|
void oggpackB_writetrunc(oggpack_buffer *b,long bits){
|
|
long bytes=bits>>3;
|
|
bits-=bytes*8;
|
|
b->ptr=b->buffer+bytes;
|
|
b->endbit=bits;
|
|
b->endbyte=bytes;
|
|
*b->ptr&=mask8B[bits];
|
|
}
|
|
|
|
/* Takes only up to 32 bits. */
|
|
void oggpack_write(oggpack_buffer *b,unsigned long value,int bits){
|
|
if(b->endbyte+4>=b->storage){
|
|
b->buffer=_ogg_realloc(b->buffer,b->storage+BUFFER_INCREMENT);
|
|
b->storage+=BUFFER_INCREMENT;
|
|
b->ptr=b->buffer+b->endbyte;
|
|
}
|
|
|
|
value&=mask[bits];
|
|
bits+=b->endbit;
|
|
|
|
b->ptr[0]|=value<<b->endbit;
|
|
|
|
if(bits>=8){
|
|
b->ptr[1]=(unsigned char)(value>>(8-b->endbit));
|
|
if(bits>=16){
|
|
b->ptr[2]=(unsigned char)(value>>(16-b->endbit));
|
|
if(bits>=24){
|
|
b->ptr[3]=(unsigned char)(value>>(24-b->endbit));
|
|
if(bits>=32){
|
|
if(b->endbit)
|
|
b->ptr[4]=(unsigned char)(value>>(32-b->endbit));
|
|
else
|
|
b->ptr[4]=0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
b->endbyte+=bits/8;
|
|
b->ptr+=bits/8;
|
|
b->endbit=bits&7;
|
|
}
|
|
|
|
/* Takes only up to 32 bits. */
|
|
void oggpackB_write(oggpack_buffer *b,unsigned long value,int bits){
|
|
if(b->endbyte+4>=b->storage){
|
|
b->buffer=_ogg_realloc(b->buffer,b->storage+BUFFER_INCREMENT);
|
|
b->storage+=BUFFER_INCREMENT;
|
|
b->ptr=b->buffer+b->endbyte;
|
|
}
|
|
|
|
value=(value&mask[bits])<<(32-bits);
|
|
bits+=b->endbit;
|
|
|
|
b->ptr[0]|=value>>(24+b->endbit);
|
|
|
|
if(bits>=8){
|
|
b->ptr[1]=(unsigned char)(value>>(16+b->endbit));
|
|
if(bits>=16){
|
|
b->ptr[2]=(unsigned char)(value>>(8+b->endbit));
|
|
if(bits>=24){
|
|
b->ptr[3]=(unsigned char)(value>>(b->endbit));
|
|
if(bits>=32){
|
|
if(b->endbit)
|
|
b->ptr[4]=(unsigned char)(value<<(8-b->endbit));
|
|
else
|
|
b->ptr[4]=0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
b->endbyte+=bits/8;
|
|
b->ptr+=bits/8;
|
|
b->endbit=bits&7;
|
|
}
|
|
|
|
void oggpack_writealign(oggpack_buffer *b){
|
|
int bits=8-b->endbit;
|
|
if(bits<8)
|
|
oggpack_write(b,0,bits);
|
|
}
|
|
|
|
void oggpackB_writealign(oggpack_buffer *b){
|
|
int bits=8-b->endbit;
|
|
if(bits<8)
|
|
oggpackB_write(b,0,bits);
|
|
}
|
|
|
|
static void oggpack_writecopy_helper(oggpack_buffer *b,
|
|
void *source,
|
|
long bits,
|
|
void (*w)(oggpack_buffer *,
|
|
unsigned long,
|
|
int),
|
|
int msb){
|
|
unsigned char *ptr=(unsigned char *)source;
|
|
|
|
long bytes=bits/8;
|
|
bits-=bytes*8;
|
|
|
|
if(b->endbit){
|
|
int i;
|
|
/* unaligned copy. Do it the hard way. */
|
|
for(i=0;i<bytes;i++)
|
|
w(b,(unsigned long)(ptr[i]),8);
|
|
}else{
|
|
/* aligned block copy */
|
|
if(b->endbyte+bytes+1>=b->storage){
|
|
b->storage=b->endbyte+bytes+BUFFER_INCREMENT;
|
|
b->buffer=_ogg_realloc(b->buffer,b->storage);
|
|
b->ptr=b->buffer+b->endbyte;
|
|
}
|
|
|
|
memmove(b->ptr,source,bytes);
|
|
b->ptr+=bytes;
|
|
b->endbyte+=bytes;
|
|
*b->ptr=0;
|
|
|
|
}
|
|
if(bits){
|
|
if(msb)
|
|
w(b,(unsigned long)(ptr[bytes]>>(8-bits)),bits);
|
|
else
|
|
w(b,(unsigned long)(ptr[bytes]),bits);
|
|
}
|
|
}
|
|
|
|
void oggpack_writecopy(oggpack_buffer *b,void *source,long bits){
|
|
oggpack_writecopy_helper(b,source,bits,oggpack_write,0);
|
|
}
|
|
|
|
void oggpackB_writecopy(oggpack_buffer *b,void *source,long bits){
|
|
oggpack_writecopy_helper(b,source,bits,oggpackB_write,1);
|
|
}
|
|
|
|
void oggpack_reset(oggpack_buffer *b){
|
|
b->ptr=b->buffer;
|
|
b->buffer[0]=0;
|
|
b->endbit=b->endbyte=0;
|
|
}
|
|
|
|
void oggpackB_reset(oggpack_buffer *b){
|
|
oggpack_reset(b);
|
|
}
|
|
|
|
void oggpack_writeclear(oggpack_buffer *b){
|
|
_ogg_free(b->buffer);
|
|
memset(b,0,sizeof(*b));
|
|
}
|
|
|
|
void oggpackB_writeclear(oggpack_buffer *b){
|
|
oggpack_writeclear(b);
|
|
}
|
|
|
|
void oggpack_readinit(oggpack_buffer *b,unsigned char *buf,int bytes){
|
|
memset(b,0,sizeof(*b));
|
|
b->buffer=b->ptr=buf;
|
|
b->storage=bytes;
|
|
}
|
|
|
|
void oggpackB_readinit(oggpack_buffer *b,unsigned char *buf,int bytes){
|
|
oggpack_readinit(b,buf,bytes);
|
|
}
|
|
|
|
/* Read in bits without advancing the bitptr; bits <= 32 */
|
|
long oggpack_look(oggpack_buffer *b,int bits){
|
|
unsigned long ret;
|
|
unsigned long m=mask[bits];
|
|
|
|
bits+=b->endbit;
|
|
|
|
if(b->endbyte+4>=b->storage){
|
|
/* not the main path */
|
|
if(b->endbyte*8+bits>b->storage*8)return(-1);
|
|
}
|
|
|
|
ret=b->ptr[0]>>b->endbit;
|
|
if(bits>8){
|
|
ret|=b->ptr[1]<<(8-b->endbit);
|
|
if(bits>16){
|
|
ret|=b->ptr[2]<<(16-b->endbit);
|
|
if(bits>24){
|
|
ret|=b->ptr[3]<<(24-b->endbit);
|
|
if(bits>32 && b->endbit)
|
|
ret|=b->ptr[4]<<(32-b->endbit);
|
|
}
|
|
}
|
|
}
|
|
return(m&ret);
|
|
}
|
|
|
|
/* Read in bits without advancing the bitptr; bits <= 32 */
|
|
long oggpackB_look(oggpack_buffer *b,int bits){
|
|
unsigned long ret;
|
|
int m=32-bits;
|
|
|
|
bits+=b->endbit;
|
|
|
|
if(b->endbyte+4>=b->storage){
|
|
/* not the main path */
|
|
if(b->endbyte*8+bits>b->storage*8)return(-1);
|
|
}
|
|
|
|
ret=b->ptr[0]<<(24+b->endbit);
|
|
if(bits>8){
|
|
ret|=b->ptr[1]<<(16+b->endbit);
|
|
if(bits>16){
|
|
ret|=b->ptr[2]<<(8+b->endbit);
|
|
if(bits>24){
|
|
ret|=b->ptr[3]<<(b->endbit);
|
|
if(bits>32 && b->endbit)
|
|
ret|=b->ptr[4]>>(8-b->endbit);
|
|
}
|
|
}
|
|
}
|
|
return ((ret&0xffffffff)>>(m>>1))>>((m+1)>>1);
|
|
}
|
|
|
|
long oggpack_look1(oggpack_buffer *b){
|
|
if(b->endbyte>=b->storage)return(-1);
|
|
return((b->ptr[0]>>b->endbit)&1);
|
|
}
|
|
|
|
long oggpackB_look1(oggpack_buffer *b){
|
|
if(b->endbyte>=b->storage)return(-1);
|
|
return((b->ptr[0]>>(7-b->endbit))&1);
|
|
}
|
|
|
|
void oggpack_adv(oggpack_buffer *b,int bits){
|
|
bits+=b->endbit;
|
|
b->ptr+=bits/8;
|
|
b->endbyte+=bits/8;
|
|
b->endbit=bits&7;
|
|
}
|
|
|
|
void oggpackB_adv(oggpack_buffer *b,int bits){
|
|
oggpack_adv(b,bits);
|
|
}
|
|
|
|
void oggpack_adv1(oggpack_buffer *b){
|
|
if(++(b->endbit)>7){
|
|
b->endbit=0;
|
|
b->ptr++;
|
|
b->endbyte++;
|
|
}
|
|
}
|
|
|
|
void oggpackB_adv1(oggpack_buffer *b){
|
|
oggpack_adv1(b);
|
|
}
|
|
|
|
/* bits <= 32 */
|
|
long oggpack_read(oggpack_buffer *b,int bits){
|
|
long ret;
|
|
unsigned long m=mask[bits];
|
|
|
|
bits+=b->endbit;
|
|
|
|
if(b->endbyte+4>=b->storage){
|
|
/* not the main path */
|
|
ret=-1L;
|
|
if(b->endbyte*8+bits>b->storage*8)goto overflow;
|
|
}
|
|
|
|
ret=b->ptr[0]>>b->endbit;
|
|
if(bits>8){
|
|
ret|=b->ptr[1]<<(8-b->endbit);
|
|
if(bits>16){
|
|
ret|=b->ptr[2]<<(16-b->endbit);
|
|
if(bits>24){
|
|
ret|=b->ptr[3]<<(24-b->endbit);
|
|
if(bits>32 && b->endbit){
|
|
ret|=b->ptr[4]<<(32-b->endbit);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
ret&=m;
|
|
|
|
overflow:
|
|
|
|
b->ptr+=bits/8;
|
|
b->endbyte+=bits/8;
|
|
b->endbit=bits&7;
|
|
return(ret);
|
|
}
|
|
|
|
/* bits <= 32 */
|
|
long oggpackB_read(oggpack_buffer *b,int bits){
|
|
long ret;
|
|
long m=32-bits;
|
|
|
|
bits+=b->endbit;
|
|
|
|
if(b->endbyte+4>=b->storage){
|
|
/* not the main path */
|
|
ret=-1L;
|
|
if(b->endbyte*8+bits>b->storage*8)goto overflow;
|
|
}
|
|
|
|
ret=b->ptr[0]<<(24+b->endbit);
|
|
if(bits>8){
|
|
ret|=b->ptr[1]<<(16+b->endbit);
|
|
if(bits>16){
|
|
ret|=b->ptr[2]<<(8+b->endbit);
|
|
if(bits>24){
|
|
ret|=b->ptr[3]<<(b->endbit);
|
|
if(bits>32 && b->endbit)
|
|
ret|=b->ptr[4]>>(8-b->endbit);
|
|
}
|
|
}
|
|
}
|
|
ret=((ret&0xffffffffUL)>>(m>>1))>>((m+1)>>1);
|
|
|
|
overflow:
|
|
|
|
b->ptr+=bits/8;
|
|
b->endbyte+=bits/8;
|
|
b->endbit=bits&7;
|
|
return(ret);
|
|
}
|
|
|
|
long oggpack_read1(oggpack_buffer *b){
|
|
long ret;
|
|
|
|
if(b->endbyte>=b->storage){
|
|
/* not the main path */
|
|
ret=-1L;
|
|
goto overflow;
|
|
}
|
|
|
|
ret=(b->ptr[0]>>b->endbit)&1;
|
|
|
|
overflow:
|
|
|
|
b->endbit++;
|
|
if(b->endbit>7){
|
|
b->endbit=0;
|
|
b->ptr++;
|
|
b->endbyte++;
|
|
}
|
|
return(ret);
|
|
}
|
|
|
|
long oggpackB_read1(oggpack_buffer *b){
|
|
long ret;
|
|
|
|
if(b->endbyte>=b->storage){
|
|
/* not the main path */
|
|
ret=-1L;
|
|
goto overflow;
|
|
}
|
|
|
|
ret=(b->ptr[0]>>(7-b->endbit))&1;
|
|
|
|
overflow:
|
|
|
|
b->endbit++;
|
|
if(b->endbit>7){
|
|
b->endbit=0;
|
|
b->ptr++;
|
|
b->endbyte++;
|
|
}
|
|
return(ret);
|
|
}
|
|
|
|
long oggpack_bytes(oggpack_buffer *b){
|
|
return(b->endbyte+(b->endbit+7)/8);
|
|
}
|
|
|
|
long oggpack_bits(oggpack_buffer *b){
|
|
return(b->endbyte*8+b->endbit);
|
|
}
|
|
|
|
long oggpackB_bytes(oggpack_buffer *b){
|
|
return oggpack_bytes(b);
|
|
}
|
|
|
|
long oggpackB_bits(oggpack_buffer *b){
|
|
return oggpack_bits(b);
|
|
}
|
|
|
|
unsigned char *oggpack_get_buffer(oggpack_buffer *b){
|
|
return(b->buffer);
|
|
}
|
|
|
|
unsigned char *oggpackB_get_buffer(oggpack_buffer *b){
|
|
return oggpack_get_buffer(b);
|
|
}
|
|
|
|
#undef BUFFER_INCREMENT
|