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https://github.com/FFmpeg/FFmpeg.git
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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: a1e98f198e by Mans Rullgard.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer
parent
53509d20ca
commit
1a2484fc4e
@ -35,31 +35,11 @@
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#include "libavutil/log.h"
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#include "mathops.h"
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#if defined(ALT_BITSTREAM_READER_LE) && !defined(ALT_BITSTREAM_READER)
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# define ALT_BITSTREAM_READER
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#endif
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#if !defined(A32_BITSTREAM_READER) && !defined(ALT_BITSTREAM_READER)
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# if ARCH_ARM && !HAVE_FAST_UNALIGNED
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# define A32_BITSTREAM_READER
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# else
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# define ALT_BITSTREAM_READER
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//#define A32_BITSTREAM_READER
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# endif
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#endif
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/* bit input */
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/* buffer, buffer_end and size_in_bits must be present and used by every reader */
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typedef struct GetBitContext {
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const uint8_t *buffer, *buffer_end;
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#ifdef ALT_BITSTREAM_READER
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int index;
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#elif defined A32_BITSTREAM_READER
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uint32_t *buffer_ptr;
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uint32_t cache0;
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uint32_t cache1;
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int bit_count;
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#endif
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int size_in_bits;
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} GetBitContext;
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@ -122,8 +102,11 @@ LAST_SKIP_BITS(name, gb, num)
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for examples see get_bits, show_bits, skip_bits, get_vlc
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*/
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#ifdef ALT_BITSTREAM_READER
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#ifdef LONG_BITSTREAM_READER
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# define MIN_CACHE_BITS 32
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#else
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# define MIN_CACHE_BITS 25
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#endif
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# define OPEN_READER(name, gb) \
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unsigned int name##_index = (gb)->index; \
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@ -132,13 +115,23 @@ for examples see get_bits, show_bits, skip_bits, get_vlc
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# define CLOSE_READER(name, gb) (gb)->index = name##_index
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# ifdef ALT_BITSTREAM_READER_LE
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# ifdef LONG_BITSTREAM_READER
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# define UPDATE_CACHE(name, gb) \
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name##_cache = AV_RL64((gb)->buffer+(name##_index>>3)) >> (name##_index&0x07)
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# else
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# define UPDATE_CACHE(name, gb) \
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name##_cache = AV_RL32((gb)->buffer+(name##_index>>3)) >> (name##_index&0x07)
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# endif
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# define SKIP_CACHE(name, gb, num) name##_cache >>= (num)
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# else
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# ifdef LONG_BITSTREAM_READER
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# define UPDATE_CACHE(name, gb) \
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name##_cache = AV_RB64((gb)->buffer+(name##_index >> 3)) >> (32 - (name##_index & 0x07))
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# else
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# define UPDATE_CACHE(name, gb) \
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name##_cache = AV_RB32((gb)->buffer+(name##_index>>3)) << (name##_index&0x07)
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# endif
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# define SKIP_CACHE(name, gb, num) name##_cache <<= (num)
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# endif
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@ -174,80 +167,6 @@ static inline void skip_bits_long(GetBitContext *s, int n){
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s->index += n;
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}
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#elif defined A32_BITSTREAM_READER
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# define MIN_CACHE_BITS 32
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# define OPEN_READER(name, gb) \
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int name##_bit_count = (gb)->bit_count; \
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uint32_t name##_cache0 = (gb)->cache0; \
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uint32_t name##_cache1 = (gb)->cache1; \
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uint32_t *name##_buffer_ptr = (gb)->buffer_ptr
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# define CLOSE_READER(name, gb) do { \
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(gb)->bit_count = name##_bit_count; \
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(gb)->cache0 = name##_cache0; \
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(gb)->cache1 = name##_cache1; \
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(gb)->buffer_ptr = name##_buffer_ptr; \
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} while (0)
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# define UPDATE_CACHE(name, gb) do { \
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if(name##_bit_count > 0){ \
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const uint32_t next = av_be2ne32(*name##_buffer_ptr); \
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name##_cache0 |= NEG_USR32(next, name##_bit_count); \
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name##_cache1 |= next << name##_bit_count; \
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name##_buffer_ptr++; \
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name##_bit_count -= 32; \
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} \
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} while (0)
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#if ARCH_X86
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# define SKIP_CACHE(name, gb, num) \
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__asm__("shldl %2, %1, %0 \n\t" \
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"shll %2, %1 \n\t" \
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: "+r" (name##_cache0), "+r" (name##_cache1) \
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: "Ic" ((uint8_t)(num)))
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#else
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# define SKIP_CACHE(name, gb, num) do { \
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name##_cache0 <<= (num); \
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name##_cache0 |= NEG_USR32(name##_cache1,num); \
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name##_cache1 <<= (num); \
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} while (0)
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#endif
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# define SKIP_COUNTER(name, gb, num) name##_bit_count += (num)
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# define SKIP_BITS(name, gb, num) do { \
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SKIP_CACHE(name, gb, num); \
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SKIP_COUNTER(name, gb, num); \
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} while (0)
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# define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num)
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# define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num)
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# define SHOW_UBITS(name, gb, num) NEG_USR32(name##_cache0, num)
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# define SHOW_SBITS(name, gb, num) NEG_SSR32(name##_cache0, num)
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# define GET_CACHE(name, gb) name##_cache0
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static inline int get_bits_count(const GetBitContext *s) {
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return ((uint8_t*)s->buffer_ptr - s->buffer)*8 - 32 + s->bit_count;
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}
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static inline void skip_bits_long(GetBitContext *s, int n){
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OPEN_READER(re, s);
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re_bit_count += n;
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re_buffer_ptr += re_bit_count>>5;
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re_bit_count &= 31;
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re_cache0 = av_be2ne32(re_buffer_ptr[-1]) << re_bit_count;
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re_cache1 = 0;
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UPDATE_CACHE(re, s);
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CLOSE_READER(re, s);
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}
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#endif
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/**
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* read mpeg1 dc style vlc (sign bit + mantisse with no MSB).
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* if MSB not set it is negative
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@ -309,7 +228,6 @@ static inline void skip_bits(GetBitContext *s, int n){
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}
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static inline unsigned int get_bits1(GetBitContext *s){
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#ifdef ALT_BITSTREAM_READER
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unsigned int index = s->index;
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uint8_t result = s->buffer[index>>3];
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#ifdef ALT_BITSTREAM_READER_LE
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@ -323,9 +241,6 @@ static inline unsigned int get_bits1(GetBitContext *s){
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s->index = index;
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return result;
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#else
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return get_bits(s, 1);
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#endif
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}
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static inline unsigned int show_bits1(GetBitContext *s){
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@ -400,13 +315,7 @@ static inline void init_get_bits(GetBitContext *s,
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s->buffer = buffer;
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s->size_in_bits = bit_size;
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s->buffer_end = buffer + buffer_size;
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#ifdef ALT_BITSTREAM_READER
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s->index = 0;
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#elif defined A32_BITSTREAM_READER
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s->buffer_ptr = (uint32_t*)((intptr_t)buffer & ~3);
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s->bit_count = 32 + 8*((intptr_t)buffer & 3);
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skip_bits_long(s, 0);
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#endif
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}
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static inline void align_get_bits(GetBitContext *s)
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@ -26,7 +26,7 @@
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//#define DEBUG
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#define A32_BITSTREAM_READER
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#define LONG_BITSTREAM_READER
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#include "avcodec.h"
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#include "get_bits.h"
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@ -333,7 +333,7 @@ static av_always_inline void decode_ac_coeffs(AVCodecContext *avctx, GetBitConte
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block_mask = blocks_per_slice - 1;
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for (pos = block_mask;;) {
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bits_left = gb->size_in_bits - (((uint8_t*)re_buffer_ptr - gb->buffer)*8 - 32 + re_bit_count);
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bits_left = gb->size_in_bits - re_index;
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if (!bits_left || (bits_left < 32 && !SHOW_UBITS(re, gb, bits_left)))
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break;
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