/*
* copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#define AVCODEC_PUT_BITS_H
#include <stdint.h>
-#include <stdlib.h>
+#include <stddef.h>
#include <assert.h>
-#include "libavutil/bswap.h"
-#include "libavutil/common.h"
-#include "libavutil/intreadwrite.h"
-#include "libavutil/log.h"
-#include "mathops.h"
-//#define ALT_BITSTREAM_WRITER
-//#define ALIGNED_BITSTREAM_WRITER
+#include "libavutil/intreadwrite.h"
-/* 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;
* @param buffer the buffer where to put bits
* @param buffer_size the size in bytes of buffer
*/
-static inline void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
+static inline void init_put_bits(PutBitContext *s, uint8_t *buffer,
+ int buffer_size)
{
- if(buffer_size < 0) {
+ if (buffer_size < 0) {
buffer_size = 0;
- buffer = NULL;
+ 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
+ s->size_in_bits = 8 * buffer_size;
+ s->buf = buffer;
+ s->buf_end = s->buf + buffer_size;
+ s->buf_ptr = s->buf;
+ s->bit_left = 32;
+ s->bit_buf = 0;
}
/**
*/
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
+}
+
+/**
+ * @return the number of bits available in the bitstream.
+ */
+static inline int put_bits_left(PutBitContext* s)
+{
+ return (s->buf_end - s->buf_ptr) * 8 - 32 + s->bit_left;
}
/**
*/
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;
+ if (s->bit_left < 32)
+ 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;
+ *s->buf_ptr++ = s->bit_buf;
+ s->bit_buf >>= 8;
#else
- *s->buf_ptr++=s->bit_buf >> 24;
- s->bit_buf<<=8;
+ *s->buf_ptr++ = s->bit_buf >> 24;
+ s->bit_buf <<= 8;
#endif
- s->bit_left+=8;
+ s->bit_left += 8;
}
- s->bit_left=32;
- s->bit_buf=0;
-#endif
+ s->bit_left = 32;
+ s->bit_buf = 0;
}
-#if defined(ALT_BITSTREAM_WRITER) || defined(BITSTREAM_WRITER_LE)
-#define align_put_bits align_put_bits_unsupported_here
-#define ff_put_string ff_put_string_unsupported_here
-#define ff_copy_bits ff_copy_bits_unsupported_here
+#ifdef BITSTREAM_WRITER_LE
+#define avpriv_align_put_bits align_put_bits_unsupported_here
+#define avpriv_put_string ff_put_string_unsupported_here
+#define avpriv_copy_bits avpriv_copy_bits_unsupported_here
#else
/**
* Pad the bitstream with zeros up to the next byte boundary.
*/
-void align_put_bits(PutBitContext *s);
+void avpriv_align_put_bits(PutBitContext *s);
/**
* Put the string string in the bitstream.
*
* @param terminate_string 0-terminates the written string if value is 1
*/
-void ff_put_string(PutBitContext *pb, const char *string, int terminate_string);
+void avpriv_put_string(PutBitContext *pb, const char *string,
+ int terminate_string);
/**
* Copy the content of src to the bitstream.
*
* @param length the number of bits of src to copy
*/
-void ff_copy_bits(PutBitContext *pb, const uint8_t *src, int length);
+void avpriv_copy_bits(PutBitContext *pb, const uint8_t *src, int length);
#endif
/**
* Use put_bits32 to write 32 bits.
*/
static inline void put_bits(PutBitContext *s, int n, unsigned int value)
-#ifndef ALT_BITSTREAM_WRITER
{
unsigned int bit_buf;
int bit_left;
- // printf("put_bits=%d %x\n", n, value);
assert(n <= 31 && value < (1U << n));
- bit_buf = s->bit_buf;
+ 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;
+ AV_WL32(s->buf_ptr, bit_buf);
+ s->buf_ptr += 4;
+ bit_buf = (bit_left == 32) ? 0 : value >> bit_left;
+ bit_left += 32;
}
- bit_left-=n;
+ bit_left -= n;
#else
if (n < bit_left) {
- bit_buf = (bit_buf<<n) | value;
- bit_left-=n;
+ bit_buf = (bit_buf << n) | value;
+ bit_left -= n;
} else {
- bit_buf<<=bit_left;
- bit_buf |= value >> (n - bit_left);
-#if !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;
+ bit_buf <<= bit_left;
+ bit_buf |= value >> (n - bit_left);
+ AV_WB32(s->buf_ptr, bit_buf);
+ s->buf_ptr += 4;
+ bit_left += 32 - n;
+ bit_buf = value;
}
#endif
- s->bit_buf = bit_buf;
+ s->bit_buf = bit_buf;
s->bit_left = bit_left;
}
-#else /* ALT_BITSTREAM_WRITER defined */
-{
-# 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 n, int32_t value)
{
assert(n >= 0 && n <= 31);
- put_bits(pb, n, value & ((1<<n)-1));
+ put_bits(pb, n, value & ((1 << n) - 1));
}
/**
* Return the pointer to the byte where the bitstream writer will put
* the next bit.
*/
-static inline uint8_t* put_bits_ptr(PutBitContext *s)
+static inline uint8_t *put_bits_ptr(PutBitContext *s)
{
-#ifdef ALT_BITSTREAM_WRITER
- return s->buf + (s->index>>3);
-#else
- return s->buf_ptr;
-#endif
+ return s->buf_ptr;
}
/**
*/
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
+ assert((put_bits_count(s) & 7) == 0);
+ assert(s->bit_left == 32);
+ s->buf_ptr += n;
}
/**
*/
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-= 4*(s->bit_left>>5);
+ s->buf_ptr -= 4 * (s->bit_left >> 5);
s->bit_left &= 31;
-#endif
}
/**
*/
static inline void set_put_bits_buffer_size(PutBitContext *s, int size)
{
- s->buf_end= s->buf + size;
+ s->buf_end = s->buf + size;
}
#endif /* AVCODEC_PUT_BITS_H */
projects / ffmpeg / blobdiff