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[client] added initial NAL unit parser

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This commit is contained in:
Geoffrey McRae
2018-01-05 11:36:18 +11:00
parent a36d312844
commit 50ba9b4899
5 changed files with 680 additions and 47 deletions
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32
client/utils.h
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@@ -60,4 +60,34 @@ static inline void nsleep(uint64_t ns)
#define LG_LOCK(x) SDL_LockMutex(x)
#define LG_UNLOCK(x) SDL_UnlockMutex(x)
#define LG_LOCK_FREE(x) SDL_DestroyMutex(x)
#endif
#endif
static inline uint32_t get_bit(const uint8_t * const base, size_t * const offset)
{
uint32_t out = ((*(base + (*offset >> 0x3))) >> (0x7 - (*offset & 0x7))) & 0x1;
++*offset;
return out;
}
static inline uint32_t get_bits(const uint8_t * const base, size_t * const offset, const uint8_t bits)
{
uint32_t value = 0;
for (int i = 0; i < bits; ++i)
value |= (get_bit(base, offset) ? 1 : 0) << (bits - i - 1);
return value;
}
static inline uint32_t decode_u_golomb(const uint8_t * const base, size_t * const offset)
{
uint32_t i = 0;
while(get_bit(base, offset) == 0)
++i;
return ((1 << i) - 1 + get_bits(base, offset, i));
}
static inline int32_t decode_s_golomb(const uint8_t * const base, size_t * const offset)
{
const uint32_t g = decode_u_golomb(base, offset);
return (g & 0x1) ? (g + 1) / 2 : -(g / 2);
}