/*
* Common bit i/o utils
* Copyright (c) 2000, 2001 Fabrice Bellard.
+ * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
*
* alternative bitstream reader & writer by Michael Niedermayer <michaelni@gmx.at>
*/
-#include "avcodec.h"
-void init_put_bits(PutBitContext *s,
- UINT8 *buffer, int buffer_size,
- void *opaque,
- void (*write_data)(void *, UINT8 *, int))
-{
- s->buf = buffer;
- s->buf_end = s->buf + buffer_size;
- s->data_out_size = 0;
- if(write_data!=NULL)
- {
- fprintf(stderr, "write Data callback is not supported\n");
- }
-#ifdef ALT_BITSTREAM_WRITER
- s->index=0;
- ((uint32_t*)(s->buf))[0]=0;
-// memset(buffer, 0, buffer_size);
-#else
- s->buf_ptr = s->buf;
- s->bit_left=32;
- s->bit_buf=0;
-#endif
-}
+/**
+ * @file common.c
+ * common internal api.
+ */
-/* return the number of bits output */
-INT64 get_bit_count(PutBitContext *s)
-{
-#ifdef ALT_BITSTREAM_WRITER
- return s->data_out_size * 8 + s->index;
-#else
- return (s->buf_ptr - s->buf + s->data_out_size) * 8 + 32 - (INT64)s->bit_left;
-#endif
-}
+#include "avcodec.h"
+
+const uint8_t ff_sqrt_tab[128]={
+ 0, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5,
+ 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+ 9, 9, 9, 9,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,11,11,11,11,11,11,11
+};
+
+const uint8_t ff_log2_tab[256]={
+ 0,0,1,1,2,2,2,2,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
+ 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
+ 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
+ 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
+ 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
+ 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
+ 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
+ 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7
+};
void align_put_bits(PutBitContext *s)
{
#endif
}
-/* pad the end of the output stream with zeros */
-void flush_put_bits(PutBitContext *s)
-{
-#ifdef ALT_BITSTREAM_WRITER
- align_put_bits(s);
-#else
- s->bit_buf<<= s->bit_left;
- while (s->bit_left < 32) {
- /* XXX: should test end of buffer */
- *s->buf_ptr++=s->bit_buf >> 24;
- s->bit_buf<<=8;
- s->bit_left+=8;
- }
- s->bit_left=32;
- s->bit_buf=0;
-#endif
-}
-
-/* pad the end of the output stream with zeros */
-#ifndef ALT_BITSTREAM_WRITER
-void jflush_put_bits(PutBitContext *s)
-{
- unsigned int b;
- s->bit_buf<<= s->bit_left;
- s->bit_buf |= ~1U >> (32 - s->bit_left); /* set all the unused bits to one */
-
- while (s->bit_left < 32) {
- b = s->bit_buf >> 24;
- *s->buf_ptr++ = b;
- if (b == 0xff)
- *s->buf_ptr++ = 0;
- s->bit_buf<<=8;
- s->bit_left+=8;
- }
- s->bit_left=32;
- s->bit_buf=0;
-}
-#else
-void jflush_put_bits(PutBitContext *s)
-{
- int num= ( - s->index) & 7;
- jput_bits(s, num,0xFF>>(8-num));
-}
-#endif
-
-void put_string(PutBitContext * pbc, char *s)
+void put_string(PutBitContext * pbc, char *s, int put_zero)
{
while(*s){
put_bits(pbc, 8, *s);
s++;
}
- put_bits(pbc, 8, 0);
+ if(put_zero)
+ put_bits(pbc, 8, 0);
}
/* bit input functions */
-void init_get_bits(GetBitContext *s,
- UINT8 *buffer, int buffer_size)
-{
- s->buffer= buffer;
- s->size= buffer_size;
- s->buffer_end= buffer + buffer_size;
-#ifdef ALT_BITSTREAM_READER
- s->index=0;
-#elif defined LIBMPEG2_BITSTREAM_READER
- s->buffer_ptr = buffer;
- s->bit_count = 16;
- s->cache = 0;
-#elif defined A32_BITSTREAM_READER
- s->buffer_ptr = (uint32_t*)buffer;
- s->bit_count = 32;
- s->cache0 = 0;
- s->cache1 = 0;
-#endif
- {
- OPEN_READER(re, s)
- UPDATE_CACHE(re, s)
-// UPDATE_CACHE(re, s)
- CLOSE_READER(re, s)
+/**
+ * reads 0-32 bits.
+ */
+unsigned int get_bits_long(GetBitContext *s, int n){
+ if(n<=17) return get_bits(s, n);
+ else{
+ int ret= get_bits(s, 16) << (n-16);
+ return ret | get_bits(s, n-16);
+ }
+}
+
+/**
+ * shows 0-32 bits.
+ */
+unsigned int show_bits_long(GetBitContext *s, int n){
+ if(n<=17) return show_bits(s, n);
+ else{
+ GetBitContext gb= *s;
+ int ret= get_bits_long(s, n);
+ *s= gb;
+ return ret;
}
-#ifdef A32_BITSTREAM_READER
- s->cache1 = 0;
-#endif
}
void align_get_bits(GetBitContext *s)
if(n) skip_bits(s, n);
}
-int check_marker(GetBitContext *s, char *msg)
+int check_marker(GetBitContext *s, const char *msg)
{
int bit= get_bits1(s);
- if(!bit) printf("Marker bit missing %s\n", msg);
+ if(!bit)
+ av_log(NULL, AV_LOG_INFO, "Marker bit missing %s\n", msg);
return bit;
}
#define GET_DATA(v, table, i, wrap, size) \
{\
- UINT8 *ptr = (UINT8 *)table + i * wrap;\
+ const uint8_t *ptr = (const uint8_t *)table + i * wrap;\
switch(size) {\
case 1:\
- v = *(UINT8 *)ptr;\
+ v = *(const uint8_t *)ptr;\
break;\
case 2:\
- v = *(UINT16 *)ptr;\
+ v = *(const uint16_t *)ptr;\
break;\
default:\
- v = *(UINT32 *)ptr;\
+ v = *(const uint32_t *)ptr;\
break;\
}\
}
vlc->table_size += size;
if (vlc->table_size > vlc->table_allocated) {
vlc->table_allocated += (1 << vlc->bits);
- vlc->table = realloc(vlc->table,
- sizeof(VLC_TYPE) * 2 * vlc->table_allocated);
+ vlc->table = av_realloc(vlc->table,
+ sizeof(VLC_TYPE) * 2 * vlc->table_allocated);
if (!vlc->table)
return -1;
}
int nb_codes,
const void *bits, int bits_wrap, int bits_size,
const void *codes, int codes_wrap, int codes_size,
- UINT32 code_prefix, int n_prefix)
+ uint32_t code_prefix, int n_prefix)
{
int i, j, k, n, table_size, table_index, nb, n1, index;
- UINT32 code;
+ uint32_t code;
VLC_TYPE (*table)[2];
table_size = 1 << table_nb_bits;
nb = 1 << (table_nb_bits - n);
for(k=0;k<nb;k++) {
#ifdef DEBUG_VLC
- printf("%4x: code=%d n=%d\n",
+ av_log(NULL, AV_LOG_DEBUG, "%4x: code=%d n=%d\n",
j, i, n);
#endif
if (table[j][1] /*bits*/ != 0) {
- fprintf(stderr, "incorrect codes\n");
- exit(1);
+ av_log(NULL, AV_LOG_ERROR, "incorrect codes\n");
+ av_abort();
}
table[j][1] = n; //bits
table[j][0] = i; //code
av_free(vlc->table);
}
-int ff_gcd(int a, int b){
+int64_t ff_gcd(int64_t a, int64_t b){
if(b) return ff_gcd(b, a%b);
else return a;
}
projects / ffmpeg / blobdiff