27 #ifndef AVCODEC_RANGECODER_H 28 #define AVCODEC_RANGECODER_H 46 #define MAX_OVERREAD 2 74 while (c->
range < 0x100) {
77 }
else if (c->
low <= 0xFF00) {
82 }
else if (c->
low >= 0x10000) {
91 c->
low = (c->
low & 0xFF) << 8;
106 int range1 = (c->
range * (*state)) >> 8;
125 if (c->
range < 0x100) {
138 int range1 = (c->
range * (*state)) >> 8;
int ff_rac_terminate(RangeCoder *c, int version)
Terminates the range coder.
static int get_rac(RangeCoder *c, uint8_t *const state)
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
void ff_init_range_encoder(RangeCoder *c, uint8_t *buf, int buf_size)
void ff_build_rac_states(RangeCoder *c, int factor, int max_p)
static void put_rac(RangeCoder *c, uint8_t *const state, int bit)
int ff_rac_check_termination(RangeCoder *c, int version)
Check if at the current position there is a valid looking termination.
static void renorm_encoder(RangeCoder *c)
simple assert() macros that are a bit more flexible than ISO C assert().
static void refill(RangeCoder *c)
void ff_init_range_decoder(RangeCoder *c, const uint8_t *buf, int buf_size)
static int get_rac_count(RangeCoder *c)
static const int factor[16]
common internal and external API header
#define bit(string, value)
uint8_t * bytestream_start