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