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author | Diego Biurrun <diego@biurrun.de> | 2012-10-05 19:05:00 +0200 |
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committer | Diego Biurrun <diego@biurrun.de> | 2012-10-12 20:56:54 +0200 |
commit | 90558e848a29ef1e85ecb1832ad9a26eebe958e0 (patch) | |
tree | b545a918005574fe1e3fcc802aaac161beb45ed8 /libavcodec/rangecoder.h | |
parent | ca411fc1d34329cd17b28627f697e391ae52073f (diff) | |
download | ffmpeg-90558e848a29ef1e85ecb1832ad9a26eebe958e0.tar.gz |
rangecoder: K&R formatting cosmetics
Diffstat (limited to 'libavcodec/rangecoder.h')
-rw-r--r-- | libavcodec/rangecoder.h | 92 |
1 files changed, 49 insertions, 43 deletions
diff --git a/libavcodec/rangecoder.h b/libavcodec/rangecoder.h index 7ad1bd2e55..ad9c81faa4 100644 --- a/libavcodec/rangecoder.h +++ b/libavcodec/rangecoder.h @@ -29,112 +29,118 @@ #include <stdint.h> #include <assert.h> + #include "libavutil/common.h" -typedef struct RangeCoder{ +typedef struct RangeCoder { int low; int range; int outstanding_count; int outstanding_byte; uint8_t zero_state[256]; - uint8_t one_state[256]; + uint8_t one_state[256]; uint8_t *bytestream_start; uint8_t *bytestream; uint8_t *bytestream_end; -}RangeCoder; +} RangeCoder; void ff_init_range_encoder(RangeCoder *c, uint8_t *buf, int buf_size); void ff_init_range_decoder(RangeCoder *c, const uint8_t *buf, int buf_size); int ff_rac_terminate(RangeCoder *c); void ff_build_rac_states(RangeCoder *c, int factor, int max_p); -static inline void renorm_encoder(RangeCoder *c){ - //FIXME optimize - while(c->range < 0x100){ - if(c->outstanding_byte < 0){ - c->outstanding_byte= c->low>>8; - }else if(c->low <= 0xFF00){ +static inline void renorm_encoder(RangeCoder *c) +{ + // FIXME: optimize + while (c->range < 0x100) { + if (c->outstanding_byte < 0) { + c->outstanding_byte = c->low >> 8; + } else if (c->low <= 0xFF00) { *c->bytestream++ = c->outstanding_byte; - for(;c->outstanding_count; c->outstanding_count--) + for (; c->outstanding_count; c->outstanding_count--) *c->bytestream++ = 0xFF; - c->outstanding_byte= c->low>>8; - }else if(c->low >= 0x10000){ + c->outstanding_byte = c->low >> 8; + } else if (c->low >= 0x10000) { *c->bytestream++ = c->outstanding_byte + 1; - for(;c->outstanding_count; c->outstanding_count--) + for (; c->outstanding_count; c->outstanding_count--) *c->bytestream++ = 0x00; - c->outstanding_byte= (c->low>>8) & 0xFF; - }else{ + c->outstanding_byte = (c->low >> 8) & 0xFF; + } else { c->outstanding_count++; } - c->low = (c->low & 0xFF)<<8; + c->low = (c->low & 0xFF) << 8; c->range <<= 8; } } -static inline int get_rac_count(RangeCoder *c){ - int x= c->bytestream - c->bytestream_start + c->outstanding_count; - if(c->outstanding_byte >= 0) +static inline int get_rac_count(RangeCoder *c) +{ + int x = c->bytestream - c->bytestream_start + c->outstanding_count; + if (c->outstanding_byte >= 0) x++; - return 8*x - av_log2(c->range); + return 8 * x - av_log2(c->range); } -static inline void put_rac(RangeCoder *c, uint8_t * const state, int bit){ - int range1= (c->range * (*state)) >> 8; +static inline void put_rac(RangeCoder *c, uint8_t *const state, int bit) +{ + int range1 = (c->range * (*state)) >> 8; assert(*state); assert(range1 < c->range); assert(range1 > 0); - if(!bit){ + if (!bit) { c->range -= range1; - *state= c->zero_state[*state]; - }else{ - c->low += c->range - range1; + *state = c->zero_state[*state]; + } else { + c->low += c->range - range1; c->range = range1; - *state= c->one_state[*state]; + *state = c->one_state[*state]; } renorm_encoder(c); } -static inline void refill(RangeCoder *c){ - if(c->range < 0x100){ +static inline void refill(RangeCoder *c) +{ + if (c->range < 0x100) { c->range <<= 8; - c->low <<= 8; - if(c->bytestream < c->bytestream_end) - c->low+= c->bytestream[0]; + c->low <<= 8; + if (c->bytestream < c->bytestream_end) + c->low += c->bytestream[0]; c->bytestream++; } } -static inline int get_rac(RangeCoder *c, uint8_t * const state){ - int range1= (c->range * (*state)) >> 8; +static inline int get_rac(RangeCoder *c, uint8_t *const state) +{ + int range1 = (c->range * (*state)) >> 8; int av_unused one_mask; c->range -= range1; #if 1 - if(c->low < c->range){ - *state= c->zero_state[*state]; + if (c->low < c->range) { + *state = c->zero_state[*state]; refill(c); return 0; - }else{ - c->low -= c->range; - *state= c->one_state[*state]; + } else { + c->low -= c->range; + *state = c->one_state[*state]; c->range = range1; refill(c); return 1; } #else - one_mask= (c->range - c->low-1)>>31; + one_mask = (c->range - c->low - 1) >> 31; - c->low -= c->range & one_mask; + c->low -= c->range & one_mask; c->range += (range1 - c->range) & one_mask; - *state= c->zero_state[(*state) + (256&one_mask)]; + *state = c->zero_state[(*state) + (256 & one_mask)]; refill(c); - return one_mask&1; + return one_mask & 1; #endif } |