+/*
+ * copyright (c) 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
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
/**
* @file bitstream.h
* bitstream api header.
#ifndef BITSTREAM_H
#define BITSTREAM_H
+#include "log.h"
+
+#if defined(ALT_BITSTREAM_READER_LE) && !defined(ALT_BITSTREAM_READER)
+#define ALT_BITSTREAM_READER
+#endif
+
//#define ALT_BITSTREAM_WRITER
//#define ALIGNED_BITSTREAM_WRITER
-
+#if !defined(LIBMPEG2_BITSTREAM_READER) && !defined(A32_BITSTREAM_READER) && !defined(ALT_BITSTREAM_READER)
+# ifdef ARCH_ARMV4L
+# define A32_BITSTREAM_READER
+# else
#define ALT_BITSTREAM_READER
//#define LIBMPEG2_BITSTREAM_READER
//#define A32_BITSTREAM_READER
+# endif
+#endif
#define LIBMPEG2_BITSTREAM_READER_HACK //add BERO
-
+
extern const uint8_t ff_reverse[256];
#if defined(ARCH_X86) || defined(ARCH_X86_64)
static inline void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
{
+ if(buffer_size < 0) {
+ buffer_size = 0;
+ buffer = NULL;
+ }
+
s->buf = buffer;
s->buf_end = s->buf + buffer_size;
#ifdef ALT_BITSTREAM_WRITER
}
void align_put_bits(PutBitContext *s);
-void put_string(PutBitContext * pbc, char *s, int put_zero);
+void ff_put_string(PutBitContext * pbc, char *s, int put_zero);
/* bit input */
/* buffer, buffer_end and size_in_bits must be present and used by every reader */
uint8_t run;
} RL_VLC_ELEM;
-#ifdef ARCH_SPARC
+#if defined(ARCH_SPARC) || defined(ARCH_ARMV4L) || defined(ARCH_MIPS)
#define UNALIGNED_STORES_ARE_BAD
#endif
/* used to avoid missaligned exceptions on some archs (alpha, ...) */
#if defined(ARCH_X86) || defined(ARCH_X86_64)
+# define unaligned16(a) (*(const uint16_t*)(a))
# define unaligned32(a) (*(const uint32_t*)(a))
+# define unaligned64(a) (*(const uint64_t*)(a))
#else
# ifdef __GNUC__
-static inline uint32_t unaligned32(const void *v) {
- struct Unaligned {
- uint32_t i;
- } __attribute__((packed));
-
- return ((const struct Unaligned *) v)->i;
+# define unaligned(x) \
+static inline uint##x##_t unaligned##x(const void *v) { \
+ struct Unaligned { \
+ uint##x##_t i; \
+ } __attribute__((packed)); \
+ \
+ return ((const struct Unaligned *) v)->i; \
}
# elif defined(__DECC)
-static inline uint32_t unaligned32(const void *v) {
- return *(const __unaligned uint32_t *) v;
+# define unaligned(x) \
+static inline uint##x##_t unaligned##x##(const void *v) { \
+ return *(const __unaligned uint##x##_t *) v; \
}
# else
-static inline uint32_t unaligned32(const void *v) {
- return *(const uint32_t *) v;
+# define unaligned(x) \
+static inline uint##x##_t unaligned##x##(const void *v) { \
+ return *(const uint##x##_t *) v; \
}
# endif
+unaligned(16)
+unaligned(32)
+unaligned(64)
+#undef unaligned
#endif //!ARCH_X86
#ifndef ALT_BITSTREAM_WRITER
unsigned int bit_buf;
int bit_left;
-#ifdef STATS
- st_out_bit_counts[st_current_index] += n;
-#endif
// printf("put_bits=%d %x\n", n, value);
assert(n == 32 || value < (1U << n));
-
+
bit_buf = s->bit_buf;
bit_left = s->bit_left;
bit_buf = (bit_buf<<n) | value;
bit_left-=n;
} else {
- bit_buf<<=bit_left;
+ bit_buf<<=bit_left;
bit_buf |= value >> (n - bit_left);
#ifdef UNALIGNED_STORES_ARE_BAD
if (3 & (intptr_t) s->buf_ptr) {
*(uint32_t *)s->buf_ptr = be2me_32(bit_buf);
//printf("bitbuf = %08x\n", bit_buf);
s->buf_ptr+=4;
- bit_left+=32 - n;
+ bit_left+=32 - n;
bit_buf = value;
}
# ifdef ALIGNED_BITSTREAM_WRITER
# if defined(ARCH_X86) || defined(ARCH_X86_64)
asm volatile(
- "movl %0, %%ecx \n\t"
- "xorl %%eax, %%eax \n\t"
- "shrdl %%cl, %1, %%eax \n\t"
- "shrl %%cl, %1 \n\t"
- "movl %0, %%ecx \n\t"
- "shrl $3, %%ecx \n\t"
- "andl $0xFFFFFFFC, %%ecx \n\t"
- "bswapl %1 \n\t"
- "orl %1, (%2, %%ecx) \n\t"
- "bswapl %%eax \n\t"
- "addl %3, %0 \n\t"
- "movl %%eax, 4(%2, %%ecx) \n\t"
- : "=&r" (s->index), "=&r" (value)
- : "r" (s->buf), "r" (n), "0" (s->index), "1" (value<<(-n))
- : "%eax", "%ecx"
+ "movl %0, %%ecx \n\t"
+ "xorl %%eax, %%eax \n\t"
+ "shrdl %%cl, %1, %%eax \n\t"
+ "shrl %%cl, %1 \n\t"
+ "movl %0, %%ecx \n\t"
+ "shrl $3, %%ecx \n\t"
+ "andl $0xFFFFFFFC, %%ecx \n\t"
+ "bswapl %1 \n\t"
+ "orl %1, (%2, %%ecx) \n\t"
+ "bswapl %%eax \n\t"
+ "addl %3, %0 \n\t"
+ "movl %%eax, 4(%2, %%ecx) \n\t"
+ : "=&r" (s->index), "=&r" (value)
+ : "r" (s->buf), "r" (n), "0" (s->index), "1" (value<<(-n))
+ : "%eax", "%ecx"
);
# else
int index= s->index;
uint32_t *ptr= ((uint32_t *)s->buf)+(index>>5);
-
- value<<= 32-n;
-
+
+ value<<= 32-n;
+
ptr[0] |= be2me_32(value>>(index&31));
ptr[1] = be2me_32(value<<(32-(index&31)));
//if(n>24) printf("%d %d\n", n, value);
# else //ALIGNED_BITSTREAM_WRITER
# if defined(ARCH_X86) || defined(ARCH_X86_64)
asm volatile(
- "movl $7, %%ecx \n\t"
- "andl %0, %%ecx \n\t"
- "addl %3, %%ecx \n\t"
- "negl %%ecx \n\t"
- "shll %%cl, %1 \n\t"
- "bswapl %1 \n\t"
- "movl %0, %%ecx \n\t"
- "shrl $3, %%ecx \n\t"
- "orl %1, (%%ecx, %2) \n\t"
- "addl %3, %0 \n\t"
- "movl $0, 4(%%ecx, %2) \n\t"
- : "=&r" (s->index), "=&r" (value)
- : "r" (s->buf), "r" (n), "0" (s->index), "1" (value)
- : "%ecx"
+ "movl $7, %%ecx \n\t"
+ "andl %0, %%ecx \n\t"
+ "addl %3, %%ecx \n\t"
+ "negl %%ecx \n\t"
+ "shll %%cl, %1 \n\t"
+ "bswapl %1 \n\t"
+ "movl %0, %%ecx \n\t"
+ "shrl $3, %%ecx \n\t"
+ "orl %1, (%%ecx, %2) \n\t"
+ "addl %3, %0 \n\t"
+ "movl $0, 4(%%ecx, %2) \n\t"
+ : "=&r" (s->index), "=&r" (value)
+ : "r" (s->buf), "r" (n), "0" (s->index), "1" (value)
+ : "%ecx"
);
# else
int index= s->index;
uint32_t *ptr= (uint32_t*)(((uint8_t *)s->buf)+(index>>3));
-
+
ptr[0] |= be2me_32(value<<(32-n-(index&7) ));
ptr[1] = 0;
//if(n>24) printf("%d %d\n", n, value);
static inline uint8_t* pbBufPtr(PutBitContext *s)
{
#ifdef ALT_BITSTREAM_WRITER
- return s->buf + (s->index>>3);
+ return s->buf + (s->index>>3);
#else
- return s->buf_ptr;
+ return s->buf_ptr;
#endif
}
assert((put_bits_count(s)&7)==0);
#ifdef ALT_BITSTREAM_WRITER
FIXME may need some cleaning of the buffer
- s->index += n<<3;
+ s->index += n<<3;
#else
assert(s->bit_left==32);
- s->buf_ptr += n;
-#endif
+ s->buf_ptr += n;
+#endif
}
/**
s->bit_left -= n;
s->buf_ptr-= s->bit_left>>5;
s->bit_left &= 31;
-#endif
+#endif
}
/**
will output the contents of the internal cache, next bit is MSB of 32 or 64 bit (FIXME 64bit)
SHOW_UBITS(name, gb, num)
- will return the nest num bits
+ will return the next num bits
SHOW_SBITS(name, gb, num)
- will return the nest num bits and do sign extension
+ will return the next num bits and do sign extension
SKIP_BITS(name, gb, num)
will skip over the next num bits
- note, this is equinvalent to SKIP_CACHE; SKIP_COUNTER
+ note, this is equivalent to SKIP_CACHE; SKIP_COUNTER
SKIP_CACHE(name, gb, num)
will remove the next num bits from the cache (note SKIP_COUNTER MUST be called before UPDATE_CACHE / CLOSE_READER)
will remove the next num bits from the cache if it is needed for UPDATE_CACHE otherwise it will do nothing
LAST_SKIP_BITS(name, gb, num)
- is equinvalent to SKIP_LAST_CACHE; SKIP_COUNTER
+ is equivalent to SKIP_LAST_CACHE; SKIP_COUNTER
for examples see get_bits, show_bits, skip_bits, get_vlc
*/
static inline int unaligned32_be(const void *v)
{
#ifdef CONFIG_ALIGN
- const uint8_t *p=v;
- return (((p[0]<<8) | p[1])<<16) | (p[2]<<8) | (p[3]);
+ const uint8_t *p=v;
+ return (((p[0]<<8) | p[1])<<16) | (p[2]<<8) | (p[3]);
#else
- return be2me_32( unaligned32(v)); //original
+ return be2me_32( unaligned32(v)); //original
+#endif
+}
+
+static inline int unaligned32_le(const void *v)
+{
+#ifdef CONFIG_ALIGN
+ const uint8_t *p=v;
+ return (((p[3]<<8) | p[2])<<16) | (p[1]<<8) | (p[0]);
+#else
+ return le2me_32( unaligned32(v)); //original
#endif
}
# define CLOSE_READER(name, gb)\
(gb)->index= name##_index;\
+# ifdef ALT_BITSTREAM_READER_LE
+# define UPDATE_CACHE(name, gb)\
+ name##_cache= unaligned32_le( ((const uint8_t *)(gb)->buffer)+(name##_index>>3) ) >> (name##_index&0x07);\
+
+# define SKIP_CACHE(name, gb, num)\
+ name##_cache >>= (num);
+# else
# define UPDATE_CACHE(name, gb)\
name##_cache= unaligned32_be( ((const uint8_t *)(gb)->buffer)+(name##_index>>3) ) << (name##_index&0x07);\
# define SKIP_CACHE(name, gb, num)\
- name##_cache <<= (num);\
+ name##_cache <<= (num);
+# endif
// FIXME name?
# define SKIP_COUNTER(name, gb, num)\
# define LAST_SKIP_BITS(name, gb, num) SKIP_COUNTER(name, gb, num)
# define LAST_SKIP_CACHE(name, gb, num) ;
+# ifdef ALT_BITSTREAM_READER_LE
+# define SHOW_UBITS(name, gb, num)\
+ ((name##_cache) & (NEG_USR32(0xffffffff,num)))
+# else
# define SHOW_UBITS(name, gb, num)\
NEG_USR32(name##_cache, num)
+# endif
# define SHOW_SBITS(name, gb, num)\
NEG_SSR32(name##_cache, num)
static inline int get_bits_count(GetBitContext *s){
return s->index;
}
+
+static inline void skip_bits_long(GetBitContext *s, int n){
+ s->index += n;
+}
+
#elif defined LIBMPEG2_BITSTREAM_READER
//libmpeg2 like reader
return (s->buffer_ptr - s->buffer)*8 - 16 + s->bit_count;
}
+static inline void skip_bits_long(GetBitContext *s, int n){
+ OPEN_READER(re, s)
+ re_bit_count += n;
+ re_buffer_ptr += 2*(re_bit_count>>4);
+ re_bit_count &= 15;
+ re_cache = ((re_buffer_ptr[-2]<<8) + re_buffer_ptr[-1]) << (16+re_bit_count);
+ UPDATE_CACHE(re, s)
+ CLOSE_READER(re, s)
+}
+
#elif defined A32_BITSTREAM_READER
# define MIN_CACHE_BITS 32
#if defined(ARCH_X86) || defined(ARCH_X86_64)
# define SKIP_CACHE(name, gb, num)\
asm(\
- "shldl %2, %1, %0 \n\t"\
- "shll %2, %1 \n\t"\
+ "shldl %2, %1, %0 \n\t"\
+ "shll %2, %1 \n\t"\
: "+r" (name##_cache0), "+r" (name##_cache1)\
- : "Ic" ((uint8_t)num)\
+ : "Ic" ((uint8_t)(num))\
);
#else
# define SKIP_CACHE(name, gb, num)\
return ((uint8_t*)s->buffer_ptr - s->buffer)*8 - 32 + s->bit_count;
}
+static inline void skip_bits_long(GetBitContext *s, int n){
+ OPEN_READER(re, s)
+ re_bit_count += n;
+ re_buffer_ptr += re_bit_count>>5;
+ re_bit_count &= 31;
+ re_cache0 = be2me_32( re_buffer_ptr[-1] ) << re_bit_count;
+ re_cache1 = 0;
+ UPDATE_CACHE(re, s)
+ CLOSE_READER(re, s)
+}
+
#endif
/**
* read mpeg1 dc style vlc (sign bit + mantisse with no MSB).
- * if MSB not set it is negative
+ * if MSB not set it is negative
* @param n length in bits
- * @author BERO
+ * @author BERO
*/
static inline int get_xbits(GetBitContext *s, int n){
- register int tmp;
+ register int sign;
register int32_t cache;
OPEN_READER(re, s)
UPDATE_CACHE(re, s)
cache = GET_CACHE(re,s);
- if ((int32_t)cache<0) { //MSB=1
- tmp = NEG_USR32(cache,n);
- } else {
- // tmp = (-1<<n) | NEG_USR32(cache,n) + 1; mpeg12.c algo
- // tmp = - (NEG_USR32(cache,n) ^ ((1 << n) - 1)); h263.c algo
- tmp = - NEG_USR32(~cache,n);
- }
+ sign=(~cache)>>31;
LAST_SKIP_BITS(re, s, n)
CLOSE_READER(re, s)
- return tmp;
+ return (NEG_USR32(sign ^ cache, n) ^ sign) - sign;
}
static inline int get_sbits(GetBitContext *s, int n){
/**
* reads 0-17 bits.
- * Note, the alt bitstream reader can read upto 25 bits, but the libmpeg2 reader cant
+ * Note, the alt bitstream reader can read up to 25 bits, but the libmpeg2 reader can't
*/
static inline unsigned int get_bits(GetBitContext *s, int n){
register int tmp;
return tmp;
}
-unsigned int get_bits_long(GetBitContext *s, int n);
-
/**
* shows 0-17 bits.
- * Note, the alt bitstream reader can read upto 25 bits, but the libmpeg2 reader cant
+ * Note, the alt bitstream reader can read up to 25 bits, but the libmpeg2 reader can't
*/
static inline unsigned int show_bits(GetBitContext *s, int n){
register int tmp;
return tmp;
}
-unsigned int show_bits_long(GetBitContext *s, int n);
-
static inline void skip_bits(GetBitContext *s, int n){
//Note gcc seems to optimize this to s->index+=n for the ALT_READER :))
OPEN_READER(re, s)
#ifdef ALT_BITSTREAM_READER
int index= s->index;
uint8_t result= s->buffer[ index>>3 ];
+#ifdef ALT_BITSTREAM_READER_LE
+ result>>= (index&0x07);
+ result&= 1;
+#else
result<<= (index&0x07);
result>>= 8 - 1;
+#endif
index++;
s->index= index;
skip_bits(s, 1);
}
+/**
+ * reads 0-32 bits.
+ */
+static inline unsigned int get_bits_long(GetBitContext *s, int n){
+ if(n<=17) return get_bits(s, n);
+ else{
+#ifdef ALT_BITSTREAM_READER_LE
+ int ret= get_bits(s, 16);
+ return ret | (get_bits(s, n-16) << 16);
+#else
+ int ret= get_bits(s, 16) << (n-16);
+ return ret | get_bits(s, n-16);
+#endif
+ }
+}
+
+/**
+ * shows 0-32 bits.
+ */
+static inline 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;
+ }
+}
+
+static inline int check_marker(GetBitContext *s, const char *msg)
+{
+ int bit= get_bits1(s);
+ if(!bit)
+ av_log(NULL, AV_LOG_INFO, "Marker bit missing %s\n", msg);
+
+ return bit;
+}
+
/**
* init GetBitContext.
* @param buffer bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE bytes larger then the actual read bits
static inline void init_get_bits(GetBitContext *s,
const uint8_t *buffer, int bit_size)
{
- const int buffer_size= (bit_size+7)>>3;
+ int buffer_size= (bit_size+7)>>3;
+ if(buffer_size < 0 || bit_size < 0) {
+ buffer_size = bit_size = 0;
+ buffer = NULL;
+ }
s->buffer= buffer;
s->size_in_bits= bit_size;
#ifdef ALT_BITSTREAM_READER
s->index=0;
#elif defined LIBMPEG2_BITSTREAM_READER
-#ifdef LIBMPEG2_BITSTREAM_READER_HACK
- if ((int)buffer&1) {
- /* word alignment */
- s->cache = (*buffer++)<<24;
- s->buffer_ptr = buffer;
- s->bit_count = 16-8;
- } else
-#endif
- {
- s->buffer_ptr = buffer;
- s->bit_count = 16;
- s->cache = 0;
- }
+ s->buffer_ptr = (uint8_t*)((intptr_t)buffer&(~1));
+ s->bit_count = 16 + 8*((intptr_t)buffer&1);
+ skip_bits_long(s, 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)
- }
-#ifdef A32_BITSTREAM_READER
- s->cache1 = 0;
+ s->buffer_ptr = (uint32_t*)((intptr_t)buffer&(~3));
+ s->bit_count = 32 + 8*((intptr_t)buffer&3);
+ skip_bits_long(s, 0);
#endif
}
-int check_marker(GetBitContext *s, const char *msg);
-void align_get_bits(GetBitContext *s);
+static inline void align_get_bits(GetBitContext *s)
+{
+ int n= (-get_bits_count(s)) & 7;
+ if(n) skip_bits(s, n);
+}
+
int init_vlc(VLC *vlc, int nb_bits, int nb_codes,
const void *bits, int bits_wrap, int bits_size,
const void *codes, int codes_wrap, int codes_size,
- int use_static);
+ int flags);
+#define INIT_VLC_USE_STATIC 1
+#define INIT_VLC_LE 2
void free_vlc(VLC *vlc);
/**
SKIP_BITS(name, gb, n)\
}
-#define GET_RL_VLC(level, run, name, gb, table, bits, max_depth)\
+#define GET_RL_VLC(level, run, name, gb, table, bits, max_depth, need_update)\
{\
int n, index, nb_bits;\
\
n = table[index].len;\
\
if(max_depth > 1 && n < 0){\
- LAST_SKIP_BITS(name, gb, bits)\
- UPDATE_CACHE(name, gb)\
+ SKIP_BITS(name, gb, bits)\
+ if(need_update){\
+ UPDATE_CACHE(name, gb)\
+ }\
\
nb_bits = -n;\
\
SKIP_BITS(name, gb, n)\
}
-// deprecated, dont use get_vlc for new code, use get_vlc2 instead or use GET_VLC directly
-static inline int get_vlc(GetBitContext *s, VLC *vlc)
-{
- int code;
- VLC_TYPE (*table)[2]= vlc->table;
-
- OPEN_READER(re, s)
- UPDATE_CACHE(re, s)
-
- GET_VLC(code, re, s, table, vlc->bits, 3)
-
- CLOSE_READER(re, s)
- return code;
-}
/**
* parses a vlc code, faster then get_vlc()
- * @param bits is the number of bits which will be read at once, must be
+ * @param bits is the number of bits which will be read at once, must be
* identical to nb_bits in init_vlc()
* @param max_depth is the number of times bits bits must be readed to completly
- * read the longest vlc code
+ * read the longest vlc code
* = (max_vlc_length + bits - 1) / bits
*/
static always_inline int get_vlc2(GetBitContext *s, VLC_TYPE (*table)[2],
int bits, int max_depth)
{
int code;
-
+
OPEN_READER(re, s)
UPDATE_CACHE(re, s)
//#define TRACE
#ifdef TRACE
-#include "avcodec.h"
static inline void print_bin(int bits, int n){
int i;
-
+
for(i=n-1; i>=0; i--){
av_log(NULL, AV_LOG_DEBUG, "%d", (bits>>i)&1);
}
static inline int get_bits_trace(GetBitContext *s, int n, char *file, const char *func, int line){
int r= get_bits(s, n);
-
+
print_bin(r, n);
av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d bit @%5d in %s %s:%d\n", r, n, r, get_bits_count(s)-n, file, func, line);
return r;
int r= get_vlc2(s, table, bits, max_depth);
int len= get_bits_count(s) - pos;
int bits2= show>>(24-len);
-
+
print_bin(bits2, len);
-
+
av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d vlc @%5d in %s %s:%d\n", bits2, len, r, pos, file, func, line);
return r;
}
static inline int get_xbits_trace(GetBitContext *s, int n, char *file, const char *func, int line){
int show= show_bits(s, n);
int r= get_xbits(s, n);
-
+
print_bin(show, n);
av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d xbt @%5d in %s %s:%d\n", show, n, r, get_bits_count(s)-n, file, func, line);
return r;
projects / ffmpeg / blobdiff