+/*
+ * copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * 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 2.1 of the License, or (at your option) any later version.
+ *
+ * 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 FFmpeg; 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
+#ifndef AVCODEC_BITSTREAM_H
+#define AVCODEC_BITSTREAM_H
-#include "log.h"
+#include <stdint.h>
+#include <stdlib.h>
+#include <assert.h>
+#include "libavutil/bswap.h"
+#include "libavutil/common.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/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)
-#define 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)
+#if defined(ARCH_X86)
// avoid +32 for shift optimization (gcc should do that ...)
static inline int32_t NEG_SSR32( int32_t a, int8_t s){
- asm ("sarl %1, %0\n\t"
+ __asm__ ("sarl %1, %0\n\t"
: "+r" (a)
: "ic" ((uint8_t)(-s))
);
return a;
}
static inline uint32_t NEG_USR32(uint32_t a, int8_t s){
- asm ("shrl %1, %0\n\t"
+ __asm__ ("shrl %1, %0\n\t"
: "+r" (a)
: "ic" ((uint8_t)(-s))
);
#ifdef ALT_BITSTREAM_WRITER
align_put_bits(s);
#else
+#ifndef BITSTREAM_WRITER_LE
s->bit_buf<<= s->bit_left;
+#endif
while (s->bit_left < 32) {
/* XXX: should test end of buffer */
+#ifdef BITSTREAM_WRITER_LE
+ *s->buf_ptr++=s->bit_buf;
+ s->bit_buf>>=8;
+#else
*s->buf_ptr++=s->bit_buf >> 24;
s->bit_buf<<=8;
+#endif
s->bit_left+=8;
}
s->bit_left=32;
}
void align_put_bits(PutBitContext *s);
-void ff_put_string(PutBitContext * pbc, char *s, int put_zero);
+void ff_put_string(PutBitContext * pbc, const char *s, int put_zero);
+void ff_copy_bits(PutBitContext *pb, const uint8_t *src, int length);
/* bit input */
/* buffer, buffer_end and size_in_bits must be present and used by every reader */
uint8_t run;
} RL_VLC_ELEM;
-#if defined(ARCH_SPARC) || defined(ARCH_ARMV4L) || defined(ARCH_MIPS)
+#if defined(ARCH_SPARC) || defined(ARCH_ARMV4L) || defined(ARCH_MIPS) || defined(ARCH_BFIN)
#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__
-# 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)
-# define unaligned(x) \
-static inline uint##x##_t unaligned##x##(const void *v) { \
- return *(const __unaligned uint##x##_t *) v; \
-}
-# else
-# 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
static inline void put_bits(PutBitContext *s, int n, unsigned int value)
{
// printf("n=%d value=%x cnt=%d buf=%x\n", n, value, bit_cnt, bit_buf);
/* XXX: optimize */
+#ifdef BITSTREAM_WRITER_LE
+ bit_buf |= value << (32 - bit_left);
+ if (n >= bit_left) {
+#ifdef UNALIGNED_STORES_ARE_BAD
+ if (3 & (intptr_t) s->buf_ptr) {
+ s->buf_ptr[0] = bit_buf ;
+ s->buf_ptr[1] = bit_buf >> 8;
+ s->buf_ptr[2] = bit_buf >> 16;
+ s->buf_ptr[3] = bit_buf >> 24;
+ } else
+#endif
+ *(uint32_t *)s->buf_ptr = le2me_32(bit_buf);
+ s->buf_ptr+=4;
+ bit_buf = (bit_left==32)?0:value >> bit_left;
+ bit_left+=32;
+ }
+ bit_left-=n;
+#else
if (n < bit_left) {
bit_buf = (bit_buf<<n) | value;
bit_left-=n;
bit_left+=32 - n;
bit_buf = value;
}
+#endif
s->bit_buf = bit_buf;
s->bit_left = bit_left;
static inline void put_bits(PutBitContext *s, int n, unsigned int value)
{
# ifdef ALIGNED_BITSTREAM_WRITER
-# if defined(ARCH_X86) || defined(ARCH_X86_64)
- asm volatile(
+# if defined(ARCH_X86)
+ __asm__ volatile(
"movl %0, %%ecx \n\t"
"xorl %%eax, %%eax \n\t"
"shrdl %%cl, %1, %%eax \n\t"
s->index= index;
# endif
# else //ALIGNED_BITSTREAM_WRITER
-# if defined(ARCH_X86) || defined(ARCH_X86_64)
- asm volatile(
+# if defined(ARCH_X86)
+ __asm__ volatile(
"movl $7, %%ecx \n\t"
"andl %0, %%ecx \n\t"
"addl %3, %%ecx \n\t"
}
#endif
+static inline void put_sbits(PutBitContext *pb, int bits, int32_t val)
+{
+ assert(bits >= 0 && bits <= 31);
+
+ put_bits(pb, bits, val & ((1<<bits)-1));
+}
+
static inline uint8_t* pbBufPtr(PutBitContext *s)
{
}
/**
- * skips the given number of bits.
- * must only be used if the actual values in the bitstream dont matter
+ * Skips the given number of bits.
+ * Must only be used if the actual values in the bitstream do not matter.
*/
static inline void skip_put_bits(PutBitContext *s, int n){
#ifdef ALT_BITSTREAM_WRITER
/* Bitstream reader API docs:
name
- abritary name which is used as prefix for the internal variables
+ arbitrary name which is used as prefix for the internal variables
gb
getbitcontext
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]);
-#else
- 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
-}
-
#ifdef ALT_BITSTREAM_READER
# define MIN_CACHE_BITS 25
# 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);\
+ name##_cache= AV_RL32( ((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);\
+ name##_cache= AV_RB32( ((const uint8_t *)(gb)->buffer)+(name##_index>>3) ) << (name##_index&0x07);\
# define SKIP_CACHE(name, gb, num)\
name##_cache <<= (num);
# ifdef ALT_BITSTREAM_READER_LE
# define SHOW_UBITS(name, gb, num)\
((name##_cache) & (NEG_USR32(0xffffffff,num)))
+
+# define SHOW_SBITS(name, gb, num)\
+ NEG_SSR32((name##_cache)<<(32-(num)), 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)
+# endif
# define GET_CACHE(name, gb)\
((uint32_t)name##_cache)
(gb)->cache= name##_cache;\
(gb)->buffer_ptr= name##_buffer_ptr;\
-#ifdef LIBMPEG2_BITSTREAM_READER_HACK
-
-# define UPDATE_CACHE(name, gb)\
- if(name##_bit_count >= 0){\
- name##_cache+= (int)be2me_16(*(uint16_t*)name##_buffer_ptr) << name##_bit_count;\
- name##_buffer_ptr += 2;\
- name##_bit_count-= 16;\
- }\
-
-#else
-
# define UPDATE_CACHE(name, gb)\
if(name##_bit_count >= 0){\
- name##_cache+= ((name##_buffer_ptr[0]<<8) + name##_buffer_ptr[1]) << name##_bit_count;\
+ name##_cache+= AV_RB16(name##_buffer_ptr) << name##_bit_count; \
name##_buffer_ptr+=2;\
name##_bit_count-= 16;\
}\
-#endif
-
# define SKIP_CACHE(name, gb, num)\
name##_cache <<= (num);\
name##_bit_count-= 32;\
}\
-#if defined(ARCH_X86) || defined(ARCH_X86_64)
+#if defined(ARCH_X86)
# define SKIP_CACHE(name, gb, num)\
- asm(\
+ __asm__(\
"shldl %2, %1, %0 \n\t"\
"shll %2, %1 \n\t"\
: "+r" (name##_cache0), "+r" (name##_cache1)\
}
/**
- * reads 0-17 bits.
+ * reads 1-17 bits.
* 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){
}
/**
- * shows 0-17 bits.
+ * shows 1-17 bits.
* 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){
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
}
}
#endif
}
-static 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 check_marker(GetBitContext *s, const char *msg);
-int init_vlc(VLC *vlc, int nb_bits, int nb_codes,
+#define init_vlc(vlc, nb_bits, nb_codes,\
+ bits, bits_wrap, bits_size,\
+ codes, codes_wrap, codes_size,\
+ flags)\
+ init_vlc_sparse(vlc, nb_bits, nb_codes,\
+ bits, bits_wrap, bits_size,\
+ codes, codes_wrap, codes_size,\
+ NULL, 0, 0, flags)
+
+int init_vlc_sparse(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,
+ const void *symbols, int symbols_wrap, int symbols_size,
int flags);
-#define INIT_VLC_USE_STATIC 1
+#define INIT_VLC_USE_STATIC 1 ///< VERY strongly deprecated and forbidden
#define INIT_VLC_LE 2
+#define INIT_VLC_USE_NEW_STATIC 4
void free_vlc(VLC *vlc);
+#define INIT_VLC_STATIC(vlc, bits, a,b,c,d,e,f,g, static_size)\
+{\
+ static VLC_TYPE table[static_size][2];\
+ (vlc)->table= table;\
+ (vlc)->table_allocated= static_size;\
+ init_vlc(vlc, bits, a,b,c,d,e,f,g, INIT_VLC_USE_NEW_STATIC);\
+}
+
+
/**
*
* if the vlc code is invalid and max_depth=1 than no bits will be removed
* parses a vlc code, faster then get_vlc()
* @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
+ * @param max_depth is the number of times bits bits must be read to completely
* read the longest vlc code
* = (max_vlc_length + bits - 1) / bits
*/
-static always_inline int get_vlc2(GetBitContext *s, VLC_TYPE (*table)[2],
+static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE (*table)[2],
int bits, int max_depth)
{
int code;
#define get_vlc(s, vlc) get_vlc_trace(s, (vlc)->table, (vlc)->bits, 3, __FILE__, __PRETTY_FUNCTION__, __LINE__)
#define get_vlc2(s, tab, bits, max) get_vlc_trace(s, tab, bits, max, __FILE__, __PRETTY_FUNCTION__, __LINE__)
-#define tprintf(...) av_log(NULL, AV_LOG_DEBUG, __VA_ARGS__)
+#define tprintf(p, ...) av_log(p, AV_LOG_DEBUG, __VA_ARGS__)
#else //TRACE
-#define tprintf(...) {}
+#define tprintf(p, ...) {}
#endif
static inline int decode012(GetBitContext *gb){
return get_bits1(gb) + 1;
}
-#endif /* BITSTREAM_H */
+static inline int decode210(GetBitContext *gb){
+ if (get_bits1(gb))
+ return 0;
+ else
+ return 2 - get_bits1(gb);
+}
+
+#endif /* AVCODEC_BITSTREAM_H */
projects / ffmpeg / blobdiff