generic-library/ffmpeg
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Merge remote-tracking branch 'qatar/master'

Browse Source 
* qatar/master:
  build: link test programs with static libraries
  dct-test: remove unused variable cropTbl
  swscale: fix overflow in gray16 vertical scaling.
  get_bits: remove LAST_SKIP_CACHE macro
  swscale: fix integer overflows in RGB pixel writing.
  swscale: add endian conversion for RGB555 and RGB444 pixel formats
  swscale: fix overflows in output of RGB48 pixels.
  get_bits: remove strange/obsolete comments
  get_bits: whitespace (mostly) cosmetics
  swscale: add rgb565 endianess conversion
  get_bits: remove unnecessary #includes
  mp3dec: hack: fix decoding with safe bitstream reader
  fate: fix eatqi test
  adpcm: Check for channels to be a non-zero integer
  swscale: fix overflows in RGB rounding constants.
  get_bits: introduce safe bitreading to prevent overreads.

Conflicts:
	libswscale/swscale.c
	libswscale/swscale_unscaled.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer
2011-12-18 02:23:57 +01:00
parent 1a2484fc4e 0ea5b44275
commit 1bdc212a39
13 changed files with 164 additions and 110 deletions
Download Patch File Download Diff File Expand all files Collapse all files

172
libavcodec/get_bits.h
View File

@@ -27,20 +27,33 @@
#define AVCODEC_GET_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"
/* bit input */
/* buffer, buffer_end and size_in_bits must be present and used by every reader */
/*
* Safe bitstream reading:
* optionally, the get_bits API can check to ensure that we
* don't read past input buffer boundaries. This is protected
* with CONFIG_SAFE_BITSTREAM_READER at the global level, and
* then below that with UNCHECKED_BITSTREAM_READER at the per-
* decoder level. This means that decoders that check internally
* can "#define UNCHECKED_BITSTREAM_READER 1" to disable
* overread checks.
* Boundary checking causes a minor performance penalty so for
* applications that won't want/need this, it can be disabled
* globally using "#define CONFIG_SAFE_BITSTREAM_READER 0".
*/
#ifndef UNCHECKED_BITSTREAM_READER
#define UNCHECKED_BITSTREAM_READER !CONFIG_SAFE_BITSTREAM_READER
#endif
typedef struct GetBitContext {
const uint8_t *buffer, *buffer_end;
int index;
int size_in_bits;
int size_in_bits_plus8;
} GetBitContext;
#define VLC_TYPE int16_t
@@ -93,11 +106,8 @@ SKIP_CACHE(name, gb, num)
SKIP_COUNTER(name, gb, num)
will increment the internal bit counter (see SKIP_CACHE & SKIP_BITS)
LAST_SKIP_CACHE(name, gb, num)
will remove the next num bits from the cache if it is needed for UPDATE_CACHE otherwise it will do nothing
LAST_SKIP_BITS(name, gb, num)
is equivalent to LAST_SKIP_CACHE; SKIP_COUNTER
like SKIP_BITS, to be used if next call is UPDATE_CACHE or CLOSE_READER
for examples see get_bits, show_bits, skip_bits, get_vlc
*/
@@ -108,72 +118,82 @@ for examples see get_bits, show_bits, skip_bits, get_vlc
# define MIN_CACHE_BITS 25
#endif
# define OPEN_READER(name, gb) \
#define OPEN_READER(name, gb) \
unsigned int name##_index = (gb)->index; \
av_unused unsigned int name##_cache
# define CLOSE_READER(name, gb) (gb)->index = name##_index
#define CLOSE_READER(name, gb) (gb)->index = name##_index
#ifdef ALT_BITSTREAM_READER_LE
# 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)
# define UPDATE_CACHE(name, gb) name##_cache = \
AV_RL64((gb)->buffer + (name##_index >> 3)) >> (name##_index & 7)
# else
# define UPDATE_CACHE(name, gb) \
name##_cache = AV_RL32((gb)->buffer+(name##_index>>3)) >> (name##_index&0x07)
# define UPDATE_CACHE(name, gb) name##_cache = \
AV_RL32((gb)->buffer + (name##_index >> 3)) >> (name##_index & 7)
# endif
# define SKIP_CACHE(name, gb, num) name##_cache >>= (num)
# else
# 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))
# define UPDATE_CACHE(name, gb) name##_cache = \
AV_RB64((gb)->buffer + (name##_index >> 3)) >> (32 - (name##_index & 7))
# else
# define UPDATE_CACHE(name, gb) \
name##_cache = AV_RB32((gb)->buffer+(name##_index>>3)) << (name##_index&0x07)
# define UPDATE_CACHE(name, gb) name##_cache = \
AV_RB32((gb)->buffer + (name##_index >> 3)) << (name##_index & 7)
# endif
# define SKIP_CACHE(name, gb, num) name##_cache <<= (num)
# endif
# define SKIP_CACHE(name, gb, num) name##_cache <<= (num)
// FIXME name?
#endif
#if UNCHECKED_BITSTREAM_READER
# define SKIP_COUNTER(name, gb, num) name##_index += (num)
#else
# define SKIP_COUNTER(name, gb, num) \
name##_index = FFMIN((gb)->size_in_bits_plus8, name##_index + (num))
#endif
# define SKIP_BITS(name, gb, num) do { \
#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_COUNTER(name, gb, num)
# define LAST_SKIP_CACHE(name, gb, num)
#define LAST_SKIP_BITS(name, gb, num) SKIP_COUNTER(name, gb, num)
# ifdef ALT_BITSTREAM_READER_LE
#ifdef ALT_BITSTREAM_READER_LE
# define SHOW_UBITS(name, gb, num) zero_extend(name##_cache, num)
# define SHOW_SBITS(name, gb, num) sign_extend(name##_cache, num)
# else
#else
# define SHOW_UBITS(name, gb, num) NEG_USR32(name##_cache, num)
# define SHOW_SBITS(name, gb, num) NEG_SSR32(name##_cache, num)
# endif
#endif
# define GET_CACHE(name, gb) ((uint32_t)name##_cache)
#define GET_CACHE(name, gb) ((uint32_t)name##_cache)
static inline int get_bits_count(const GetBitContext *s){
static inline int get_bits_count(const GetBitContext *s)
{
return s->index;
}
static inline void skip_bits_long(GetBitContext *s, int n){
#if UNCHECKED_BITSTREAM_READER
s->index += n;
#else
s->index += av_clip(n, -s->index, s->size_in_bits_plus8 - s->index);
#endif
}
/**
* read mpeg1 dc style vlc (sign bit + mantisse with no MSB).
* if MSB not set it is negative
* @param n length in bits
* @author BERO
*/
static inline int get_xbits(GetBitContext *s, int n){
static inline int get_xbits(GetBitContext *s, int n)
{
register int sign;
register int32_t cache;
OPEN_READER(re, s);
@@ -185,7 +205,8 @@ static inline int get_xbits(GetBitContext *s, int n){
return (NEG_USR32(sign ^ cache, n) ^ sign) - sign;
}
static inline int get_sbits(GetBitContext *s, int n){
static inline int get_sbits(GetBitContext *s, int n)
{
register int tmp;
OPEN_READER(re, s);
UPDATE_CACHE(re, s);
@@ -198,7 +219,8 @@ static inline int get_sbits(GetBitContext *s, int n){
/**
* Read 1-25 bits.
*/
static inline unsigned int get_bits(GetBitContext *s, int n){
static inline unsigned int get_bits(GetBitContext *s, int n)
{
register int tmp;
OPEN_READER(re, s);
UPDATE_CACHE(re, s);
@@ -211,7 +233,8 @@ static inline unsigned int get_bits(GetBitContext *s, int n){
/**
* Show 1-25 bits.
*/
static inline unsigned int show_bits(GetBitContext *s, int n){
static inline unsigned int show_bits(GetBitContext *s, int n)
{
register int tmp;
OPEN_READER(re, s);
UPDATE_CACHE(re, s);
@@ -219,15 +242,16 @@ static inline unsigned int show_bits(GetBitContext *s, int n){
return tmp;
}
static inline void skip_bits(GetBitContext *s, int n){
//Note gcc seems to optimize this to s->index+=n for the ALT_READER :))
static inline void skip_bits(GetBitContext *s, int n)
{
OPEN_READER(re, s);
UPDATE_CACHE(re, s);
LAST_SKIP_BITS(re, s, n);
CLOSE_READER(re, s);
}
static inline unsigned int get_bits1(GetBitContext *s){
static inline unsigned int get_bits1(GetBitContext *s)
{
unsigned int index = s->index;
uint8_t result = s->buffer[index>>3];
#ifdef ALT_BITSTREAM_READER_LE
@@ -237,25 +261,32 @@ static inline unsigned int get_bits1(GetBitContext *s){
result <<= index & 7;
result >>= 8 - 1;
#endif
index++;
#if !UNCHECKED_BITSTREAM_READER
if (s->index < s->size_in_bits_plus8)
#endif
index++;
s->index = index;
return result;
}
static inline unsigned int show_bits1(GetBitContext *s){
static inline unsigned int show_bits1(GetBitContext *s)
{
return show_bits(s, 1);
}
static inline void skip_bits1(GetBitContext *s){
static inline void skip_bits1(GetBitContext *s)
{
skip_bits(s, 1);
}
/**
* Read 0-32 bits.
*/
static inline unsigned int get_bits_long(GetBitContext *s, int n){
if (n <= MIN_CACHE_BITS) return get_bits(s, n);
static inline unsigned int get_bits_long(GetBitContext *s, int n)
{
if (n <= MIN_CACHE_BITS)
return get_bits(s, n);
else {
#ifdef ALT_BITSTREAM_READER_LE
int ret = get_bits(s, 16);
@@ -270,15 +301,18 @@ static inline unsigned int get_bits_long(GetBitContext *s, int n){
/**
* Read 0-32 bits as a signed integer.
*/
static inline int get_sbits_long(GetBitContext *s, int n) {
static inline int get_sbits_long(GetBitContext *s, int n)
{
return sign_extend(get_bits_long(s, n), n);
}
/**
* Show 0-32 bits.
*/
static inline unsigned int show_bits_long(GetBitContext *s, int n){
if (n <= MIN_CACHE_BITS) return show_bits(s, n);
static inline unsigned int show_bits_long(GetBitContext *s, int n)
{
if (n <= MIN_CACHE_BITS)
return show_bits(s, n);
else {
GetBitContext gb = *s;
return get_bits_long(&gb, n);
@@ -299,12 +333,9 @@ static inline int check_marker(GetBitContext *s, const char *msg)
* @param buffer bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE bytes larger than the actual read bits
* because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
* @param bit_size the size of the buffer in bits
*
* While GetBitContext stores the buffer size, for performance reasons you are
* responsible for checking for the buffer end yourself (take advantage of the padding)!
*/
static inline void init_get_bits(GetBitContext *s,
const uint8_t *buffer, int bit_size)
static inline void init_get_bits(GetBitContext *s, const uint8_t *buffer,
int bit_size)
{
int buffer_size = (bit_size+7)>>3;
if (buffer_size < 0 || bit_size < 0) {
@@ -314,6 +345,7 @@ static inline void init_get_bits(GetBitContext *s,
s->buffer = buffer;
s->size_in_bits = bit_size;
s->size_in_bits_plus8 = bit_size + 8;
s->buffer_end = buffer + buffer_size;
s->index = 0;
}
@@ -355,7 +387,8 @@ void free_vlc(VLC *vlc);
* If the vlc code is invalid and max_depth>1, then the number of bits removed
* is undefined.
*/
#define GET_VLC(code, name, gb, table, bits, max_depth) do { \
#define GET_VLC(code, name, gb, table, bits, max_depth) \
do { \
int n, nb_bits; \
unsigned int index; \
\
@@ -386,7 +419,8 @@ void free_vlc(VLC *vlc);
SKIP_BITS(name, gb, n); \
} while (0)
#define GET_RL_VLC(level, run, name, gb, table, bits, max_depth, need_update) do { \
#define GET_RL_VLC(level, run, name, gb, table, bits, max_depth, need_update) \
do { \
int n, nb_bits; \
unsigned int index; \
\
@@ -412,7 +446,7 @@ void free_vlc(VLC *vlc);
/**
* Parse a vlc code, faster than get_vlc().
* Parse a vlc code.
* @param bits is the number of bits which will be read at once, must be
* identical to nb_bits in init_vlc()
* @param max_depth is the number of times bits bits must be read to completely
@@ -420,7 +454,7 @@ void free_vlc(VLC *vlc);
* = (max_vlc_length + bits - 1) / bits
*/
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE (*table)[2],
int bits, int max_depth)
int bits, int max_depth)
{
int code;
@@ -433,7 +467,8 @@ static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE (*table)[2],
return code;
}
static inline int decode012(GetBitContext *gb){
static inline int decode012(GetBitContext *gb)
{
int n;
n = get_bits1(gb);
if (n == 0)
@@ -442,7 +477,8 @@ static inline int decode012(GetBitContext *gb){
return get_bits1(gb) + 1;
}
static inline int decode210(GetBitContext *gb){
static inline int decode210(GetBitContext *gb)
{
if (get_bits1(gb))
return 0;
else
@@ -457,7 +493,8 @@ static inline int get_bits_left(GetBitContext *gb)
//#define TRACE
#ifdef TRACE
static inline void print_bin(int bits, int n){
static inline void print_bin(int bits, int n)
{
int i;
for (i = n-1; i >= 0; i--) {
@@ -468,7 +505,8 @@ static inline void print_bin(int bits, int n){
}
static inline int get_bits_trace(GetBitContext *s, int n, char *file,
const char *func, int line){
const char *func, int line)
{
int r = get_bits(s, n);
print_bin(r, n);
@@ -478,7 +516,8 @@ static inline int get_bits_trace(GetBitContext *s, int n, char *file,
}
static inline int get_vlc_trace(GetBitContext *s, VLC_TYPE (*table)[2],
int bits, int max_depth, char *file,
const char *func, int line){
const char *func, int line)
{
int show = show_bits(s, 24);
int pos = get_bits_count(s);
int r = get_vlc2(s, table, bits, max_depth);
@@ -492,7 +531,8 @@ static inline int get_vlc_trace(GetBitContext *s, VLC_TYPE (*table)[2],
return r;
}
static inline int get_xbits_trace(GetBitContext *s, int n, char *file,
const char *func, int line){
const char *func, int line)
{
int show = show_bits(s, n);
int r = get_xbits(s, n);