author | unc0rr |
Thu, 23 Jun 2011 21:19:43 +0400 | |
changeset 5294 | 67278f1cba2c |
parent 5170 | f7e49eff3708 |
permissions | -rw-r--r-- |
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/******************************************************************** |
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* * |
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* THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. * |
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* * |
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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 'TREMOR' 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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********************************************************************/ |
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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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static 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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/* mark read process as having run off the end */ |
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static void _adv_halt(oggpack_buffer *b){ |
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b->headptr=b->head->buffer->data+b->head->begin+b->head->length; |
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b->headend=-1; |
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b->headbit=0; |
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} |
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/* spans forward, skipping as many bytes as headend is negative; if |
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headend is zero, simply finds next byte. If we're up to the end |
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of the buffer, leaves headend at zero. If we've read past the end, |
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halt the decode process. */ |
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static void _span(oggpack_buffer *b){ |
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while(b->headend<1){ |
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if(b->head->next){ |
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b->count+=b->head->length; |
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b->head=b->head->next; |
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b->headptr=b->head->buffer->data+b->head->begin-b->headend; |
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b->headend+=b->head->length; |
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}else{ |
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/* we've either met the end of decode, or gone past it. halt |
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only if we're past */ |
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if(b->headend<0 || b->headbit) |
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/* read has fallen off the end */ |
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_adv_halt(b); |
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break; |
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} |
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} |
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} |
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void oggpack_readinit(oggpack_buffer *b,ogg_reference *r){ |
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memset(b,0,sizeof(*b)); |
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b->tail=b->head=r; |
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b->count=0; |
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b->headptr=b->head->buffer->data+b->head->begin; |
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b->headend=b->head->length; |
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_span(b); |
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} |
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#define _lookspan() while(!end){\ |
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head=head->next;\ |
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if(!head) return -1;\ |
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ptr=head->buffer->data + head->begin;\ |
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end=head->length;\ |
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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 m=mask[bits]; |
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unsigned long ret=-1; |
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bits+=b->headbit; |
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if(bits >= b->headend<<3){ |
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int end=b->headend; |
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unsigned char *ptr=b->headptr; |
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ogg_reference *head=b->head; |
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if(end<0)return -1; |
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if(bits){ |
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_lookspan(); |
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ret=*ptr++>>b->headbit; |
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if(bits>8){ |
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--end; |
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_lookspan(); |
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ret|=*ptr++<<(8-b->headbit); |
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if(bits>16){ |
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--end; |
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_lookspan(); |
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ret|=*ptr++<<(16-b->headbit); |
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if(bits>24){ |
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--end; |
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_lookspan(); |
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ret|=*ptr++<<(24-b->headbit); |
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if(bits>32 && b->headbit){ |
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--end; |
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_lookspan(); |
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ret|=*ptr<<(32-b->headbit); |
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} |
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} |
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} |
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} |
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} |
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}else{ |
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/* make this a switch jump-table */ |
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123 |
ret=b->headptr[0]>>b->headbit; |
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|
124 |
if(bits>8){ |
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|
125 |
ret|=b->headptr[1]<<(8-b->headbit); |
f7e49eff3708
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|
126 |
if(bits>16){ |
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|
127 |
ret|=b->headptr[2]<<(16-b->headbit); |
f7e49eff3708
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parents:
diff
changeset
|
128 |
if(bits>24){ |
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|
129 |
ret|=b->headptr[3]<<(24-b->headbit); |
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130 |
if(bits>32 && b->headbit) |
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131 |
ret|=b->headptr[4]<<(32-b->headbit); |
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|
132 |
} |
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133 |
} |
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|
134 |
} |
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diff
changeset
|
135 |
} |
f7e49eff3708
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diff
changeset
|
136 |
|
f7e49eff3708
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|
137 |
ret&=m; |
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|
138 |
return ret; |
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diff
changeset
|
139 |
} |
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changeset
|
140 |
|
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|
141 |
/* limited to 32 at a time */ |
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|
142 |
void oggpack_adv(oggpack_buffer *b,int bits){ |
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143 |
bits+=b->headbit; |
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144 |
b->headbit=bits&7; |
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145 |
b->headptr+=bits/8; |
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146 |
if((b->headend-=bits/8)<1)_span(b); |
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|
147 |
} |
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changeset
|
148 |
|
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|
149 |
/* spans forward and finds next byte. Never halts */ |
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150 |
static void _span_one(oggpack_buffer *b){ |
f7e49eff3708
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|
151 |
while(b->headend<1){ |
f7e49eff3708
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|
152 |
if(b->head->next){ |
f7e49eff3708
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153 |
b->count+=b->head->length; |
f7e49eff3708
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|
154 |
b->head=b->head->next; |
f7e49eff3708
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|
155 |
b->headptr=b->head->buffer->data+b->head->begin; |
f7e49eff3708
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|
156 |
b->headend=b->head->length; |
f7e49eff3708
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|
157 |
}else |
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|
158 |
break; |
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diff
changeset
|
159 |
} |
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changeset
|
160 |
} |
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diff
changeset
|
161 |
|
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changeset
|
162 |
static int _halt_one(oggpack_buffer *b){ |
f7e49eff3708
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changeset
|
163 |
if(b->headend<1){ |
f7e49eff3708
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|
164 |
_adv_halt(b); |
f7e49eff3708
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|
165 |
return -1; |
f7e49eff3708
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diff
changeset
|
166 |
} |
f7e49eff3708
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changeset
|
167 |
return 0; |
f7e49eff3708
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diff
changeset
|
168 |
} |
f7e49eff3708
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diff
changeset
|
169 |
|
f7e49eff3708
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diff
changeset
|
170 |
int oggpack_eop(oggpack_buffer *b){ |
f7e49eff3708
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changeset
|
171 |
if(b->headend<0)return -1; |
f7e49eff3708
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diff
changeset
|
172 |
return 0; |
f7e49eff3708
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parents:
diff
changeset
|
173 |
} |
f7e49eff3708
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parents:
diff
changeset
|
174 |
|
f7e49eff3708
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parents:
diff
changeset
|
175 |
/* bits <= 32 */ |
f7e49eff3708
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diff
changeset
|
176 |
long oggpack_read(oggpack_buffer *b,int bits){ |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
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parents:
diff
changeset
|
177 |
unsigned long m=mask[bits]; |
f7e49eff3708
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|
178 |
ogg_uint32_t ret=-1; |
f7e49eff3708
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diff
changeset
|
179 |
|
f7e49eff3708
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changeset
|
180 |
bits+=b->headbit; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
181 |
|
f7e49eff3708
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koda
parents:
diff
changeset
|
182 |
if(bits >= b->headend<<3){ |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
183 |
|
f7e49eff3708
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koda
parents:
diff
changeset
|
184 |
if(b->headend<0)return -1; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
185 |
|
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
186 |
if(bits){ |
f7e49eff3708
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parents:
diff
changeset
|
187 |
if (_halt_one(b)) return -1; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
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parents:
diff
changeset
|
188 |
ret=*b->headptr>>b->headbit; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
189 |
|
f7e49eff3708
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koda
parents:
diff
changeset
|
190 |
if(bits>=8){ |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
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parents:
diff
changeset
|
191 |
++b->headptr; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
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parents:
diff
changeset
|
192 |
--b->headend; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
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parents:
diff
changeset
|
193 |
_span_one(b); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
194 |
if(bits>8){ |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
195 |
if (_halt_one(b)) return -1; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
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parents:
diff
changeset
|
196 |
ret|=*b->headptr<<(8-b->headbit); |
f7e49eff3708
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koda
parents:
diff
changeset
|
197 |
|
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
198 |
if(bits>=16){ |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
199 |
++b->headptr; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
200 |
--b->headend; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
201 |
_span_one(b); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
202 |
if(bits>16){ |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
203 |
if (_halt_one(b)) return -1; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
204 |
ret|=*b->headptr<<(16-b->headbit); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
205 |
|
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
206 |
if(bits>=24){ |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
207 |
++b->headptr; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
208 |
--b->headend; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
209 |
_span_one(b); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
210 |
if(bits>24){ |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
211 |
if (_halt_one(b)) return -1; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
212 |
ret|=*b->headptr<<(24-b->headbit); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
213 |
|
f7e49eff3708
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koda
parents:
diff
changeset
|
214 |
if(bits>=32){ |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
215 |
++b->headptr; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
216 |
--b->headend; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
217 |
_span_one(b); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
218 |
if(bits>32){ |
f7e49eff3708
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parents:
diff
changeset
|
219 |
if (_halt_one(b)) return -1; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
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parents:
diff
changeset
|
220 |
if(b->headbit)ret|=*b->headptr<<(32-b->headbit); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
221 |
|
f7e49eff3708
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parents:
diff
changeset
|
222 |
} |
f7e49eff3708
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koda
parents:
diff
changeset
|
223 |
} |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
224 |
} |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
225 |
} |
f7e49eff3708
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koda
parents:
diff
changeset
|
226 |
} |
f7e49eff3708
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parents:
diff
changeset
|
227 |
} |
f7e49eff3708
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koda
parents:
diff
changeset
|
228 |
} |
f7e49eff3708
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koda
parents:
diff
changeset
|
229 |
} |
f7e49eff3708
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koda
parents:
diff
changeset
|
230 |
} |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
231 |
}else{ |
f7e49eff3708
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koda
parents:
diff
changeset
|
232 |
|
f7e49eff3708
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koda
parents:
diff
changeset
|
233 |
ret=b->headptr[0]>>b->headbit; |
f7e49eff3708
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koda
parents:
diff
changeset
|
234 |
if(bits>8){ |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
235 |
ret|=b->headptr[1]<<(8-b->headbit); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
236 |
if(bits>16){ |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
237 |
ret|=b->headptr[2]<<(16-b->headbit); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
238 |
if(bits>24){ |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
239 |
ret|=b->headptr[3]<<(24-b->headbit); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
240 |
if(bits>32 && b->headbit){ |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
241 |
ret|=b->headptr[4]<<(32-b->headbit); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
242 |
} |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
243 |
} |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
244 |
} |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
245 |
} |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
246 |
|
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
247 |
b->headptr+=bits/8; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
248 |
b->headend-=bits/8; |
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249 |
} |
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250 |
|
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251 |
ret&=m; |
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b->headbit=bits&7; |
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return ret; |
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254 |
} |
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255 |
|
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256 |
long oggpack_bytes(oggpack_buffer *b){ |
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return(b->count+b->headptr-b->head->buffer->data-b->head->begin+ |
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258 |
(b->headbit+7)/8); |
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259 |
} |
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260 |
|
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261 |
long oggpack_bits(oggpack_buffer *b){ |
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262 |
return((b->count+b->headptr-b->head->buffer->data-b->head->begin)*8+ |
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263 |
b->headbit); |
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264 |
} |
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265 |