From adf3f09251db5269214952820732ae39f859ba25 Mon Sep 17 00:00:00 2001 From: Mohamed Tarek Date: Sat, 15 Aug 2009 22:06:42 +0000 Subject: Move bitstream.[ch] to codecs/lib/ffmpeg_bitstream.[ch] to avoid duplicate copies across codecs. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22337 a1c6a512-1295-4272-9138-f99709370657 --- apps/codecs/libatrac/bitstream.h | 963 --------------------------------------- 1 file changed, 963 deletions(-) delete mode 100644 apps/codecs/libatrac/bitstream.h (limited to 'apps/codecs/libatrac/bitstream.h') diff --git a/apps/codecs/libatrac/bitstream.h b/apps/codecs/libatrac/bitstream.h deleted file mode 100644 index c4b5496d00..0000000000 --- a/apps/codecs/libatrac/bitstream.h +++ /dev/null @@ -1,963 +0,0 @@ -/* - * copyright (c) 2004 Michael Niedermayer - * - * 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 - */ - -#ifndef BITSTREAM_H -#define BITSTREAM_H - -#include -#include -//#include -#include -#include -#include "../lib/ffmpeg_bswap.h" - -/* The following 2 defines are taken from libavutil/intreadwrite.h */ -#define AV_RB32(x) ((((const uint8_t*)(x))[0] << 24) | \ - (((const uint8_t*)(x))[1] << 16) | \ - (((const uint8_t*)(x))[2] << 8) | \ - ((const uint8_t*)(x))[3]) -#define AV_WB32(p, d) do { \ - ((uint8_t*)(p))[3] = (d); \ - ((uint8_t*)(p))[2] = (d)>>8; \ - ((uint8_t*)(p))[1] = (d)>>16; \ - ((uint8_t*)(p))[0] = (d)>>24; } while(0) - -#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) -# if defined(ARCH_ARM) -# define A32_BITSTREAM_READER -# else -# define ALT_BITSTREAM_READER -//#define LIBMPEG2_BITSTREAM_READER -//#define A32_BITSTREAM_READER -# endif -#endif - -extern const uint8_t ff_reverse[256]; - -#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" - : "+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" - : "+r" (a) - : "ic" ((uint8_t)(-s)) - ); - return a; -} -#else -# define NEG_SSR32(a,s) ((( int32_t)(a))>>(32-(s))) -# define NEG_USR32(a,s) (((uint32_t)(a))>>(32-(s))) -#endif - -/* bit output */ - -/* buf and buf_end must be present and used by every alternative writer. */ -typedef struct PutBitContext { -#ifdef ALT_BITSTREAM_WRITER - uint8_t *buf, *buf_end; - int index; -#else - uint32_t bit_buf; - int bit_left; - uint8_t *buf, *buf_ptr, *buf_end; -#endif - int size_in_bits; -} PutBitContext; - -static inline void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size) -{ - if(buffer_size < 0) { - buffer_size = 0; - buffer = NULL; - } - - s->size_in_bits= 8*buffer_size; - s->buf = buffer; - s->buf_end = s->buf + buffer_size; -#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 -} - -/* return the number of bits output */ -static inline int put_bits_count(PutBitContext *s) -{ -#ifdef ALT_BITSTREAM_WRITER - return s->index; -#else - return (s->buf_ptr - s->buf) * 8 + 32 - s->bit_left; -#endif -} - -/* pad the end of the output stream with zeros */ -static inline void flush_put_bits(PutBitContext *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; - s->bit_buf=0; -#endif -} - -void align_put_bits(PutBitContext *s); -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 */ -typedef struct GetBitContext { - const uint8_t *buffer, *buffer_end; -#ifdef ALT_BITSTREAM_READER - int index; -#elif defined LIBMPEG2_BITSTREAM_READER - uint8_t *buffer_ptr; - uint32_t cache; - int bit_count; -#elif defined A32_BITSTREAM_READER - uint32_t *buffer_ptr; - uint32_t cache0; - uint32_t cache1; - int bit_count; -#endif - int size_in_bits; -} GetBitContext; - -#define VLC_TYPE int16_t - -typedef struct VLC { - int bits; - VLC_TYPE (*table)[2]; ///< code, bits - int table_size, table_allocated; -} VLC; - -typedef struct RL_VLC_ELEM { - int16_t level; - int8_t len; - uint8_t run; -} RL_VLC_ELEM; - -#ifndef ALT_BITSTREAM_WRITER -static inline void put_bits(PutBitContext *s, int n, unsigned int value) -{ - unsigned int bit_buf; - int bit_left; - - // printf("put_bits=%d %x\n", n, value); - //assert(n == 32 || value < (1U << n)); - - bit_buf = s->bit_buf; - bit_left = s->bit_left; - - // 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) { -#if !HAVE_FAST_UNALIGNED - if (3 & (intptr_t) s->buf_ptr) { - AV_WL32(s->buf_ptr, bit_buf); - } 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 - bit_left); -#if !defined(HAVE_FAST_UNALIGNED) - if (3 & (intptr_t) s->buf_ptr) { - AV_WB32(s->buf_ptr, bit_buf); - } else -#endif - *(uint32_t *)s->buf_ptr = be2me_32(bit_buf); - //printf("bitbuf = %08x\n", bit_buf); - s->buf_ptr+=4; - bit_left+=32 - n; - bit_buf = value; - } -#endif - - s->bit_buf = bit_buf; - s->bit_left = bit_left; -} -#endif - - -#ifdef ALT_BITSTREAM_WRITER -static inline void put_bits(PutBitContext *s, int n, unsigned int value) -{ -# ifdef ALIGNED_BITSTREAM_WRITER -# if ARCH_X86 - __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" - ); -# else - int index= s->index; - uint32_t *ptr= ((uint32_t *)s->buf)+(index>>5); - - 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); - index+= n; - s->index= index; -# endif -# else //ALIGNED_BITSTREAM_WRITER -# if ARCH_X86 - __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" - ); -# 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); - index+= n; - s->index= index; -# endif -# endif //!ALIGNED_BITSTREAM_WRITER -} -#endif - -static inline void put_sbits(PutBitContext *pb, int bits, int32_t val) -{ - //assert(bits >= 0 && bits <= 31); - - put_bits(pb, bits, val & ((1<buf + (s->index>>3); -#else - return s->buf_ptr; -#endif -} - -/** - * - * PutBitContext must be flushed & aligned to a byte boundary before calling this. - */ -static inline void skip_put_bytes(PutBitContext *s, int n){ - //assert((put_bits_count(s)&7)==0); -#ifdef ALT_BITSTREAM_WRITER - FIXME may need some cleaning of the buffer - s->index += n<<3; -#else - //assert(s->bit_left==32); - s->buf_ptr += n; -#endif -} - -/** - * 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 - s->index += n; -#else - s->bit_left -= n; - s->buf_ptr-= s->bit_left>>5; - s->bit_left &= 31; -#endif -} - -/** - * Changes the end of the buffer. - */ -static inline void set_put_bits_buffer_size(PutBitContext *s, int size){ - s->buf_end= s->buf + size; -} - -/* Bitstream reader API docs: -name - arbitrary name which is used as prefix for the internal variables - -gb - getbitcontext - -OPEN_READER(name, gb) - loads gb into local variables - -CLOSE_READER(name, gb) - stores local vars in gb - -UPDATE_CACHE(name, gb) - refills the internal cache from the bitstream - after this call at least MIN_CACHE_BITS will be available, - -GET_CACHE(name, gb) - 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 next num bits - -SHOW_SBITS(name, gb, num) - 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 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) - -SKIP_COUNTER(name, gb, num) - will increment the internal bit counter (see SKIP_CACHE & SKIP_BITS) - -LAST_SKIP_CACHE(name, gb, num) - 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 equivalent to SKIP_LAST_CACHE; SKIP_COUNTER - -for examples see get_bits, show_bits, skip_bits, get_vlc -*/ - -#ifdef ALT_BITSTREAM_READER -# define MIN_CACHE_BITS 25 - -# define OPEN_READER(name, gb)\ - int name##_index= (gb)->index;\ - int name##_cache= 0;\ - -# define CLOSE_READER(name, gb)\ - (gb)->index= name##_index;\ - -# ifdef ALT_BITSTREAM_READER_LE -# define UPDATE_CACHE(name, gb)\ - 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= AV_RB32( ((const uint8_t *)(gb)->buffer)+(name##_index>>3) ) << (name##_index&0x07);\ - -# define SKIP_CACHE(name, gb, num)\ - name##_cache <<= (num); -# endif - -// FIXME name? -# define SKIP_COUNTER(name, gb, num)\ - name##_index += (num);\ - -# define SKIP_BITS(name, gb, num)\ - {\ - SKIP_CACHE(name, gb, num)\ - 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))) - -# 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) - -# define SHOW_SBITS(name, gb, num)\ - NEG_SSR32(name##_cache, num) -# endif - -# define GET_CACHE(name, gb)\ - ((uint32_t)name##_cache) - -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 - -# define MIN_CACHE_BITS 17 - -# define OPEN_READER(name, gb)\ - int name##_bit_count=(gb)->bit_count;\ - int name##_cache= (gb)->cache;\ - uint8_t * name##_buffer_ptr=(gb)->buffer_ptr;\ - -# define CLOSE_READER(name, gb)\ - (gb)->bit_count= name##_bit_count;\ - (gb)->cache= name##_cache;\ - (gb)->buffer_ptr= name##_buffer_ptr;\ - -# define UPDATE_CACHE(name, gb)\ - if(name##_bit_count >= 0){\ - name##_cache+= AV_RB16(name##_buffer_ptr) << name##_bit_count; \ - name##_buffer_ptr+=2;\ - name##_bit_count-= 16;\ - }\ - -# define SKIP_CACHE(name, gb, num)\ - name##_cache <<= (num);\ - -# define SKIP_COUNTER(name, gb, num)\ - name##_bit_count += (num);\ - -# define SKIP_BITS(name, gb, num)\ - {\ - SKIP_CACHE(name, gb, num)\ - SKIP_COUNTER(name, gb, num)\ - }\ - -# define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num) -# define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num) - -# define SHOW_UBITS(name, gb, num)\ - NEG_USR32(name##_cache, num) - -# define SHOW_SBITS(name, gb, num)\ - NEG_SSR32(name##_cache, num) - -# define GET_CACHE(name, gb)\ - ((uint32_t)name##_cache) - -static inline int get_bits_count(GetBitContext *s){ - 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 - -# define OPEN_READER(name, gb)\ - int name##_bit_count=(gb)->bit_count;\ - uint32_t name##_cache0= (gb)->cache0;\ - uint32_t name##_cache1= (gb)->cache1;\ - uint32_t * name##_buffer_ptr=(gb)->buffer_ptr;\ - -# define CLOSE_READER(name, gb)\ - (gb)->bit_count= name##_bit_count;\ - (gb)->cache0= name##_cache0;\ - (gb)->cache1= name##_cache1;\ - (gb)->buffer_ptr= name##_buffer_ptr;\ - -# define UPDATE_CACHE(name, gb)\ - if(name##_bit_count > 0){\ - const uint32_t next= be2me_32( *name##_buffer_ptr );\ - name##_cache0 |= NEG_USR32(next,name##_bit_count);\ - name##_cache1 |= next<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 - * @param n length in bits - * @author BERO - */ -static inline int get_xbits(GetBitContext *s, int n){ - register int sign; - register int32_t cache; - OPEN_READER(re, s) - UPDATE_CACHE(re, s) - cache = GET_CACHE(re,s); - sign=(~cache)>>31; - LAST_SKIP_BITS(re, s, n) - CLOSE_READER(re, s) - return (NEG_USR32(sign ^ cache, n) ^ sign) - sign; -} - -static inline int get_sbits(GetBitContext *s, int n){ - register int tmp; - OPEN_READER(re, s) - UPDATE_CACHE(re, s) - tmp= SHOW_SBITS(re, s, n); - LAST_SKIP_BITS(re, s, n) - CLOSE_READER(re, s) - return tmp; -} - -/** - * 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){ - register int tmp; - OPEN_READER(re, s) - UPDATE_CACHE(re, s) - tmp= SHOW_UBITS(re, s, n); - LAST_SKIP_BITS(re, s, n) - CLOSE_READER(re, s) - return tmp; -} - -/** - * 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){ - register int tmp; - OPEN_READER(re, s) - UPDATE_CACHE(re, s) - tmp= SHOW_UBITS(re, s, n); -// CLOSE_READER(re, s) - return tmp; -} - -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) - UPDATE_CACHE(re, s) - LAST_SKIP_BITS(re, s, n) - CLOSE_READER(re, s) -} - -static inline unsigned int get_bits1(GetBitContext *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; - - return result; -#else - return get_bits(s, 1); -#endif -} - -static inline unsigned int show_bits1(GetBitContext *s){ - return show_bits(s, 1); -} - -static inline void skip_bits1(GetBitContext *s){ - 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 - } -} - -#if 0 -/** - * reads 0-32 bits as a signed integer. - */ -static inline int get_sbits_long(GetBitContext *s, int n) { - return sign_extend(get_bits_long(s, n), n); -} -#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; - return get_bits_long(&gb, n); - } -} - -#if 0 -static inline int check_marker(GetBitContext *s, const char *msg) -{ - int bit= get_bits1(s); - if(!bit) - printf("Marker bit missing %s\n", msg); - - return bit; -} -#endif - -/** - * init GetBitContext. - * @param buffer bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE bytes larger then the actual read bits - * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end - * @param bit_size the size of the buffer in bits - */ -static inline void init_get_bits(GetBitContext *s, - const uint8_t *buffer, int bit_size) -{ - 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; - s->buffer_end= buffer + buffer_size; -#ifdef ALT_BITSTREAM_READER - s->index=0; -#elif defined LIBMPEG2_BITSTREAM_READER - 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*)((intptr_t)buffer&(~3)); - s->bit_count = 32 + 8*((intptr_t)buffer&3); - skip_bits_long(s, 0); -#endif -} - -static inline void align_get_bits(GetBitContext *s) -{ - int n= (-get_bits_count(s)) & 7; - if(n) skip_bits(s, n); -} - -#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 ///< 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 - * if the vlc code is invalid and max_depth>1 than the number of bits removed - * is undefined - */ -#define GET_VLC(code, name, gb, table, bits, max_depth)\ -{\ - int n, index, nb_bits;\ -\ - index= SHOW_UBITS(name, gb, bits);\ - code = table[index][0];\ - n = table[index][1];\ -\ - if(max_depth > 1 && n < 0){\ - LAST_SKIP_BITS(name, gb, bits)\ - UPDATE_CACHE(name, gb)\ -\ - nb_bits = -n;\ -\ - index= SHOW_UBITS(name, gb, nb_bits) + code;\ - code = table[index][0];\ - n = table[index][1];\ - if(max_depth > 2 && n < 0){\ - LAST_SKIP_BITS(name, gb, nb_bits)\ - UPDATE_CACHE(name, gb)\ -\ - nb_bits = -n;\ -\ - index= SHOW_UBITS(name, gb, nb_bits) + code;\ - code = table[index][0];\ - n = table[index][1];\ - }\ - }\ - SKIP_BITS(name, gb, n)\ -} - -#define GET_RL_VLC(level, run, name, gb, table, bits, max_depth, need_update)\ -{\ - int n, index, nb_bits;\ -\ - index= SHOW_UBITS(name, gb, bits);\ - level = table[index].level;\ - n = table[index].len;\ -\ - if(max_depth > 1 && n < 0){\ - SKIP_BITS(name, gb, bits)\ - if(need_update){\ - UPDATE_CACHE(name, gb)\ - }\ -\ - nb_bits = -n;\ -\ - index= SHOW_UBITS(name, gb, nb_bits) + level;\ - level = table[index].level;\ - n = table[index].len;\ - }\ - run= table[index].run;\ - SKIP_BITS(name, gb, n)\ -} - - -/** - * 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 read to completely - * read the longest vlc code - * = (max_vlc_length + bits - 1) / bits - */ -static 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) - - GET_VLC(code, re, s, table, bits, max_depth) - - CLOSE_READER(re, s) - return code; -} - -//#define TRACE - -#ifdef TRACE -static inline void print_bin(int bits, int n){ - int i; - - for(i=n-1; i>=0; i--){ - printf("%d", (bits>>i)&1); - } - for(i=n; i<24; i++) - printf(" "); -} - -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); - printf("%5d %2d %3d bit @%5d in %s %s:%d\n", r, n, r, get_bits_count(s)-n, file, func, line); - return r; -} -static inline int get_vlc_trace(GetBitContext *s, VLC_TYPE (*table)[2], int bits, int max_depth, char *file, const char *func, int line){ - int show= show_bits(s, 24); - int pos= get_bits_count(s); - 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); - - printf("%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); - printf("%5d %2d %3d xbt @%5d in %s %s:%d\n", show, n, r, get_bits_count(s)-n, file, func, line); - return r; -} - -#define get_bits(s, n) get_bits_trace(s, n, __FILE__, __PRETTY_FUNCTION__, __LINE__) -#define get_bits1(s) get_bits_trace(s, 1, __FILE__, __PRETTY_FUNCTION__, __LINE__) -#define get_xbits(s, n) get_xbits_trace(s, n, __FILE__, __PRETTY_FUNCTION__, __LINE__) -#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(p, ...) printf - -#else //TRACE -#define tprintf(p, ...) {} -#endif - -static inline int decode012(GetBitContext *gb){ - int n; - n = get_bits1(gb); - if (n == 0) - return 0; - else - return get_bits1(gb) + 1; -} - -static inline int decode210(GetBitContext *gb){ - if (get_bits1(gb)) - return 0; - else - return 2 - get_bits1(gb); -} - -#endif /* BITSTREAM_H */ -- cgit v1.2.3