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/lib/ffmpeg_bitstream.h | 963 +++++++++++++++++++++++++++++++++++++ 1 file changed, 963 insertions(+) create mode 100644 apps/codecs/lib/ffmpeg_bitstream.h (limited to 'apps/codecs/lib/ffmpeg_bitstream.h') diff --git a/apps/codecs/lib/ffmpeg_bitstream.h b/apps/codecs/lib/ffmpeg_bitstream.h new file mode 100644 index 0000000000..f0105a4afe --- /dev/null +++ b/apps/codecs/lib/ffmpeg_bitstream.h @@ -0,0 +1,963 @@ +/* + * 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 "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