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ffmpeg.wasm-core
Commit 1a2484fc authored by Michael Niedermayer's avatar Michael Niedermayer
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get_bits: drop the a32 reader. 

that way qatar maintains the code for me and i dont need to resolve conflicts.
If someone wants the a32 reader back, only thing you need to do is maintain
it, i would be happy to have it back, iam just not volunteering to maintain
it due to lack of time.

Based on: a1e98f19 by Mans Rullgard.
Signed-off-by: 's avatarMichael Niedermayer <michaelni@gmx.at>
parent 53509d20
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Showing with 16 additions and 107 deletions
libavcodec/get_bits.h
View file @ 1a2484fc
......@@ -35,31 +35,11 @@
#include "libavutil/log.h"
#include "mathops.h"
#if defined(ALT_BITSTREAM_READER_LE) && !defined(ALT_BITSTREAM_READER)
# define ALT_BITSTREAM_READER
#endif
#if !defined(A32_BITSTREAM_READER) && !defined(ALT_BITSTREAM_READER)
# if ARCH_ARM && !HAVE_FAST_UNALIGNED
# define A32_BITSTREAM_READER
# else
# define ALT_BITSTREAM_READER
//#define A32_BITSTREAM_READER
# endif
#endif
/* 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 A32_BITSTREAM_READER
uint32_t *buffer_ptr;
uint32_t cache0;
uint32_t cache1;
int bit_count;
#endif
int size_in_bits;
} GetBitContext;
......@@ -122,8 +102,11 @@ LAST_SKIP_BITS(name, gb, num)
for examples see get_bits, show_bits, skip_bits, get_vlc
*/
#ifdef ALT_BITSTREAM_READER
#ifdef LONG_BITSTREAM_READER
# define MIN_CACHE_BITS 32
#else
# define MIN_CACHE_BITS 25
#endif
# define OPEN_READER(name, gb) \
unsigned int name##_index = (gb)->index; \
......@@ -132,13 +115,23 @@ for examples see get_bits, show_bits, skip_bits, get_vlc
# define CLOSE_READER(name, gb) (gb)->index = name##_index
# ifdef ALT_BITSTREAM_READER_LE
# ifdef LONG_BITSTREAM_READER
# define UPDATE_CACHE(name, gb) \
name##_cache = AV_RL64((gb)->buffer+(name##_index>>3)) >> (name##_index&0x07)
# else
# define UPDATE_CACHE(name, gb) \
name##_cache = AV_RL32((gb)->buffer+(name##_index>>3)) >> (name##_index&0x07)
# endif
# define SKIP_CACHE(name, gb, num) name##_cache >>= (num)
# else
# ifdef LONG_BITSTREAM_READER
# define UPDATE_CACHE(name, gb) \
name##_cache = AV_RB64((gb)->buffer+(name##_index >> 3)) >> (32 - (name##_index & 0x07))
# else
# define UPDATE_CACHE(name, gb) \
name##_cache = AV_RB32((gb)->buffer+(name##_index>>3)) << (name##_index&0x07)
# endif
# define SKIP_CACHE(name, gb, num) name##_cache <<= (num)
# endif
......@@ -174,80 +167,6 @@ static inline void skip_bits_long(GetBitContext *s, int n){
s->index += n;
}
#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) do { \
(gb)->bit_count = name##_bit_count; \
(gb)->cache0 = name##_cache0; \
(gb)->cache1 = name##_cache1; \
(gb)->buffer_ptr = name##_buffer_ptr; \
} while (0)
# define UPDATE_CACHE(name, gb) do { \
if(name##_bit_count > 0){ \
const uint32_t next = av_be2ne32(*name##_buffer_ptr); \
name##_cache0 |= NEG_USR32(next, name##_bit_count); \
name##_cache1 |= next << name##_bit_count; \
name##_buffer_ptr++; \
name##_bit_count -= 32; \
} \
} while (0)
#if ARCH_X86
# define SKIP_CACHE(name, gb, num) \
__asm__("shldl %2, %1, %0 \n\t" \
"shll %2, %1 \n\t" \
: "+r" (name##_cache0), "+r" (name##_cache1) \
: "Ic" ((uint8_t)(num)))
#else
# define SKIP_CACHE(name, gb, num) do { \
name##_cache0 <<= (num); \
name##_cache0 |= NEG_USR32(name##_cache1,num); \
name##_cache1 <<= (num); \
} while (0)
#endif
# define SKIP_COUNTER(name, gb, num) name##_bit_count += (num)
# define SKIP_BITS(name, gb, num) do { \
SKIP_CACHE(name, gb, num); \
SKIP_COUNTER(name, gb, num); \
} while (0)
# 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##_cache0, num)
# define SHOW_SBITS(name, gb, num) NEG_SSR32(name##_cache0, num)
# define GET_CACHE(name, gb) name##_cache0
static inline int get_bits_count(const GetBitContext *s) {
return ((uint8_t*)s->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 = av_be2ne32(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
......@@ -309,7 +228,6 @@ static inline void skip_bits(GetBitContext *s, int n){
}
static inline unsigned int get_bits1(GetBitContext *s){
#ifdef ALT_BITSTREAM_READER
unsigned int index = s->index;
uint8_t result = s->buffer[index>>3];
#ifdef ALT_BITSTREAM_READER_LE
......@@ -323,9 +241,6 @@ static inline unsigned int get_bits1(GetBitContext *s){
s->index = index;
return result;
#else
return get_bits(s, 1);
#endif
}
static inline unsigned int show_bits1(GetBitContext *s){
......@@ -400,13 +315,7 @@ static inline void init_get_bits(GetBitContext *s,
s->buffer = buffer;
s->size_in_bits = bit_size;
s->buffer_end = buffer + buffer_size;
#ifdef ALT_BITSTREAM_READER
s->index = 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)
......
libavcodec/proresdec2.c
View file @ 1a2484fc
......@@ -26,7 +26,7 @@
//#define DEBUG
#define A32_BITSTREAM_READER
#define LONG_BITSTREAM_READER
#include "avcodec.h"
#include "get_bits.h"
......@@ -333,7 +333,7 @@ static av_always_inline void decode_ac_coeffs(AVCodecContext *avctx, GetBitConte
block_mask = blocks_per_slice - 1;
for (pos = block_mask;;) {
bits_left = gb->size_in_bits - (((uint8_t*)re_buffer_ptr - gb->buffer)*8 - 32 + re_bit_count);
bits_left = gb->size_in_bits - re_index;
if (!bits_left || (bits_left < 32 && !SHOW_UBITS(re, gb, bits_left)))
break;
......
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