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ffmpeg.wasm-core
Commit d8cf5aea authored by Michael Niedermayer's avatar Michael Niedermayer
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optimized the normal bitstream writer, its faster than the alternative one on... 

optimized the normal bitstream writer, its faster than the alternative one on p3 now ... lets hope its at least not slower on p4 & k7

Originally committed as revision 299 to svn://svn.ffmpeg.org/ffmpeg/trunk
parent 332105e4
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Inline Side-by-side
Showing with 93 additions and 124 deletions
ffserver.c
View file @ d8cf5aea
......@@ -36,6 +36,7 @@
#include <ctype.h>
#include <signal.h>
#include "bswap.h" // needed for the bitstream writer in common.h which is included in avformat.h
#include "avformat.h"
/* maximum number of simultaneous HTTP connections */
......
libavcodec/common.c
View file @ d8cf5aea
......@@ -29,82 +29,28 @@ void init_put_bits(PutBitContext *s,
s->buf = buffer;
s->buf_end = s->buf + buffer_size;
s->data_out_size = 0;
#ifdef ALT_BITSTREAM_WRITER
s->index=0;
((uint32_t*)(s->buf))[0]=0;
// memset(buffer, 0, buffer_size);
if(write_data!=NULL)
{
fprintf(stderr, "write Data callback is not supported\n");
}
#ifdef ALT_BITSTREAM_WRITER
s->index=0;
((uint32_t*)(s->buf))[0]=0;
// memset(buffer, 0, buffer_size);
#else
s->write_data = write_data;
s->opaque = opaque;
s->buf_ptr = s->buf;
s->bit_cnt=0;
s->bit_left=32;
s->bit_buf=0;
#endif
}
#ifndef ALT_BITSTREAM_WRITER
static void flush_buffer(PutBitContext *s)
{
int size;
if (s->write_data) {
size = s->buf_ptr - s->buf;
if (size > 0)
s->write_data(s->opaque, s->buf, size);
s->buf_ptr = s->buf;
s->data_out_size += size;
}
}
void put_bits(PutBitContext *s, int n, unsigned int value)
{
unsigned int bit_buf;
int bit_cnt;
#ifdef STATS
st_out_bit_counts[st_current_index] += n;
#endif
// printf("put_bits=%d %x\n", n, value);
assert(n == 32 || value < (1U << n));
bit_buf = s->bit_buf;
bit_cnt = s->bit_cnt;
// printf("n=%d value=%x cnt=%d buf=%x\n", n, value, bit_cnt, bit_buf);
/* XXX: optimize */
if (n < (32-bit_cnt)) {
bit_buf |= value << (32 - n - bit_cnt);
bit_cnt+=n;
} else {
bit_buf |= value >> (n + bit_cnt - 32);
*(UINT32 *)s->buf_ptr = be2me_32(bit_buf);
//printf("bitbuf = %08x\n", bit_buf);
s->buf_ptr+=4;
if (s->buf_ptr >= s->buf_end)
flush_buffer(s);
bit_cnt=bit_cnt + n - 32;
if (bit_cnt == 0) {
bit_buf = 0;
} else {
bit_buf = value << (32 - bit_cnt);
}
}
s->bit_buf = bit_buf;
s->bit_cnt = bit_cnt;
}
#endif
/* return the number of bits output */
INT64 get_bit_count(PutBitContext *s)
{
#ifdef ALT_BITSTREAM_WRITER
return s->data_out_size * 8 + s->index;
#else
return (s->buf_ptr - s->buf + s->data_out_size) * 8 + (INT64)s->bit_cnt;
return (s->buf_ptr - s->buf + s->data_out_size) * 8 + 32 - (INT64)s->bit_left;
#endif
}
......@@ -113,7 +59,7 @@ void align_put_bits(PutBitContext *s)
#ifdef ALT_BITSTREAM_WRITER
put_bits(s,( - s->index) & 7,0);
#else
put_bits(s,(8 - s->bit_cnt) & 7,0);
put_bits(s,s->bit_left & 7,0);
#endif
}
......@@ -123,79 +69,35 @@ void flush_put_bits(PutBitContext *s)
#ifdef ALT_BITSTREAM_WRITER
align_put_bits(s);
#else
while (s->bit_cnt > 0) {
s->bit_buf<<= s->bit_left;
while (s->bit_left < 32) {
/* XXX: should test end of buffer */
*s->buf_ptr++=s->bit_buf >> 24;
s->bit_buf<<=8;
s->bit_cnt-=8;
s->bit_left+=8;
}
flush_buffer(s);
s->bit_cnt=0;
s->bit_left=32;
s->bit_buf=0;
#endif
}
#ifndef ALT_BITSTREAM_WRITER
/* for jpeg : escape 0xff with 0x00 after it */
void jput_bits(PutBitContext *s, int n, unsigned int value)
{
unsigned int bit_buf, b;
int bit_cnt, i;
assert(n == 32 || value < (1U << n));
bit_buf = s->bit_buf;
bit_cnt = s->bit_cnt;
//printf("n=%d value=%x cnt=%d buf=%x\n", n, value, bit_cnt, bit_buf);
/* XXX: optimize */
if (n < (32-bit_cnt)) {
bit_buf |= value << (32 - n - bit_cnt);
bit_cnt+=n;
} else {
bit_buf |= value >> (n + bit_cnt - 32);
/* handle escape */
for(i=0;i<4;i++) {
b = (bit_buf >> 24);
*(s->buf_ptr++) = b;
if (b == 0xff)
*(s->buf_ptr++) = 0;
bit_buf <<= 8;
}
/* we flush the buffer sooner to handle worst case */
if (s->buf_ptr >= (s->buf_end - 8))
flush_buffer(s);
bit_cnt=bit_cnt + n - 32;
if (bit_cnt == 0) {
bit_buf = 0;
} else {
bit_buf = value << (32 - bit_cnt);
}
}
s->bit_buf = bit_buf;
s->bit_cnt = bit_cnt;
}
#endif
/* pad the end of the output stream with zeros */
#ifndef ALT_BITSTREAM_WRITER
void jflush_put_bits(PutBitContext *s)
{
unsigned int b;
s->bit_buf |= ~1U >> s->bit_cnt; /* set all the unused bits to one */
s->bit_buf<<= s->bit_left;
s->bit_buf |= ~1U >> (32 - s->bit_left); /* set all the unused bits to one */
while (s->bit_cnt > 0) {
while (s->bit_left < 32) {
b = s->bit_buf >> 24;
*s->buf_ptr++ = b;
if (b == 0xff)
*s->buf_ptr++ = 0;
s->bit_buf<<=8;
s->bit_cnt-=8;
s->bit_left+=8;
}
flush_buffer(s);
s->bit_cnt=0;
s->bit_left=32;
s->bit_buf=0;
}
#else
......
libavcodec/common.h
View file @ d8cf5aea
......@@ -168,10 +168,8 @@ typedef struct PutBitContext {
int index;
#else
UINT32 bit_buf;
int bit_cnt;
int bit_left;
UINT8 *buf, *buf_ptr, *buf_end;
void *opaque;
WriteDataFunc write_data;
#endif
INT64 data_out_size; /* in bytes */
} PutBitContext;
......@@ -181,18 +179,11 @@ void init_put_bits(PutBitContext *s,
void *opaque,
void (*write_data)(void *, UINT8 *, int));
#ifndef ALT_BITSTREAM_WRITER
void put_bits(PutBitContext *s, int n, unsigned int value);
#endif
INT64 get_bit_count(PutBitContext *s); /* XXX: change function name */
void align_put_bits(PutBitContext *s);
void flush_put_bits(PutBitContext *s);
/* jpeg specific put_bits */
#ifndef ALT_BITSTREAM_WRITER
void jput_bits(PutBitContext *s, int n, unsigned int value);
#endif
void jflush_put_bits(PutBitContext *s);
/* bit input */
......@@ -238,6 +229,42 @@ static inline uint32_t unaligned32(const void *v) {
#endif
#endif //!ARCH_X86
#ifndef ALT_BITSTREAM_WRITER
static inline void put_bits(PutBitContext *s, int n, unsigned int value)
{
unsigned int bit_buf;
int bit_left;
#ifdef STATS
st_out_bit_counts[st_current_index] += n;
#endif
// 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 */
if (n < bit_left) {
bit_buf = (bit_buf<<n) | value;
bit_left-=n;
} else {
bit_buf<<=bit_left;
bit_buf |= value >> (n - bit_left);
*(UINT32 *)s->buf_ptr = be2me_32(bit_buf);
//printf("bitbuf = %08x\n", bit_buf);
s->buf_ptr+=4;
bit_left+=32 - n;
bit_buf = value;
}
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)
{
......@@ -304,6 +331,45 @@ static inline void put_bits(PutBitContext *s, int n, unsigned int value)
}
#endif
#ifndef ALT_BITSTREAM_WRITER
/* for jpeg : escape 0xff with 0x00 after it */
static inline void jput_bits(PutBitContext *s, int n, unsigned int value)
{
unsigned int bit_buf, b;
int bit_left, i;
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 */
if (n < bit_left) {
bit_buf = (bit_buf<<n) | value;
bit_left-=n;
} else {
bit_buf<<=bit_left;
bit_buf |= value >> (n - bit_left);
/* handle escape */
for(i=0;i<4;i++) {
b = (bit_buf >> 24);
*(s->buf_ptr++) = b;
if (b == 0xff)
*(s->buf_ptr++) = 0;
bit_buf <<= 8;
}
bit_left+= 32 - n;
bit_buf = value;
}
s->bit_buf = bit_buf;
s->bit_left = bit_left;
}
#endif
#ifdef ALT_BITSTREAM_WRITER
static inline void jput_bits(PutBitContext *s, int n, int value)
{
......
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