* Range coder
* Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
*
- * This library is free software; you can redistribute it and/or
+ * 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-
+
/**
* @file rangecoder.h
* Range coder.
*/
+#ifndef AVCODEC_RANGECODER_H
+#define AVCODEC_RANGECODER_H
+
+#include <stdint.h>
+#include <assert.h>
+#include "common.h"
+
typedef struct RangeCoder{
int low;
int range;
}else{
c->outstanding_count++;
}
-
+
c->low = (c->low & 0xFF)<<8;
c->range <<= 8;
}
}
+static inline int get_rac_count(RangeCoder *c){
+ int x= c->bytestream - c->bytestream_start + c->outstanding_count;
+ if(c->outstanding_byte >= 0)
+ x++;
+ return 8*x - av_log2(c->range);
+}
+
static inline void put_rac(RangeCoder *c, uint8_t * const state, int bit){
int range1= (c->range * (*state)) >> 8;
c->range = range1;
*state= c->one_state[*state];
}
-
+
renorm_encoder(c);
}
static inline int get_rac(RangeCoder *c, uint8_t * const state){
int range1= (c->range * (*state)) >> 8;
- int one_mask;
-
+ int av_unused one_mask;
+
c->range -= range1;
#if 1
if(c->low < c->range){
}
#else
one_mask= (c->range - c->low-1)>>31;
-
+
c->low -= c->range & one_mask;
c->range += (range1 - c->range) & one_mask;
-
+
*state= c->zero_state[(*state) + (256&one_mask)];
-
+
refill(c);
return one_mask&1;
#endif
}
+#endif // AVCODEC_RANGECODER_H