# 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 ARCH_ARM
# define A32_BITSTREAM_READER
# 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;
-
-/**
- * Initializes the PutBitContext \p s.
- *
- * @param buffer the buffer where to put bits
- * @param buffer_size the size in bytes of \p buffer
- */
-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
-}
-
-/**
- * Returns the total number of bits written to the bitstream.
- */
-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
-}
-
-/**
- * Pads 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
-}
-
-/**
- * Pads the bitstream with zeros up to the next byte boundary.
- */
-void align_put_bits(PutBitContext *s);
-
-/**
- * Puts the string \p s in the bitstream.
- *
- * @param terminate_string 0-terminates the written string if value is 1
- */
-void ff_put_string(PutBitContext * pbc, const char *s, int terminate_string);
-
-/**
- * Copies the content of \p src to the bitstream.
- *
- * @param length the number of bits of \p src to copy
- */
-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 {
uint8_t run;
} RL_VLC_ELEM;
-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 == 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) | 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;
- }
-#endif
-
- 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 bits, int32_t val)
-{
- assert(bits >= 0 && bits <= 31);
-
- put_bits(pb, bits, val & ((1<<bits)-1));
-}
-
-
-static inline uint8_t* pbBufPtr(PutBitContext *s)
-{
-#ifdef ALT_BITSTREAM_WRITER
- return s->buf + (s->index>>3);
-#else
- return s->buf_ptr;
-#endif
-}
-
-/**
- * Skips the given number of bytes.
- * 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.
- * If \p n is 0 the behavior is undefined.
- */
-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.
- *
- * @param size the new size in bytes of the buffer where to put bits
- */
-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
--- /dev/null
+/*
+ * 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 libavcodec/put_bits.h
+ * bitstream writer API
+ */
+
+#ifndef AVCODEC_PUT_BITS_H
+#define AVCODEC_PUT_BITS_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"
+#include "mathops.h"
+
+//#define ALT_BITSTREAM_WRITER
+//#define ALIGNED_BITSTREAM_WRITER
+
+/* 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;
+
+/**
+ * Initializes the PutBitContext \p s.
+ *
+ * @param buffer the buffer where to put bits
+ * @param buffer_size the size in bytes of \p buffer
+ */
+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
+}
+
+/**
+ * Returns the total number of bits written to the bitstream.
+ */
+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
+}
+
+/**
+ * Pads 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
+}
+
+/**
+ * Pads the bitstream with zeros up to the next byte boundary.
+ */
+void align_put_bits(PutBitContext *s);
+
+/**
+ * Puts the string \p s in the bitstream.
+ *
+ * @param terminate_string 0-terminates the written string if value is 1
+ */
+void ff_put_string(PutBitContext * pbc, const char *s, int terminate_string);
+
+/**
+ * Copies the content of \p src to the bitstream.
+ *
+ * @param length the number of bits of \p src to copy
+ */
+void ff_copy_bits(PutBitContext *pb, const uint8_t *src, int length);
+
+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 == 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) | 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;
+ }
+#endif
+
+ 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 bits, int32_t val)
+{
+ assert(bits >= 0 && bits <= 31);
+
+ put_bits(pb, bits, val & ((1<<bits)-1));
+}
+
+
+static inline uint8_t* pbBufPtr(PutBitContext *s)
+{
+#ifdef ALT_BITSTREAM_WRITER
+ return s->buf + (s->index>>3);
+#else
+ return s->buf_ptr;
+#endif
+}
+
+/**
+ * Skips the given number of bytes.
+ * 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.
+ * If \p n is 0 the behavior is undefined.
+ */
+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.
+ *
+ * @param size the new size in bytes of the buffer where to put bits
+ */
+static inline void set_put_bits_buffer_size(PutBitContext *s, int size){
+ s->buf_end= s->buf + size;
+}
+
+#endif /* AVCODEC_PUT_BITS_H */
projects / platform / upstream / libav.git / commitdiff