* @author Michael Niedermayer <michaelni@gmx.at> and Alex Beregszaszi
*/
-#ifndef AVCODEC_GOLOMB_H
-#define AVCODEC_GOLOMB_H
+#ifndef FFMPEG_GOLOMB_H
+#define FFMPEG_GOLOMB_H
#include <stdint.h>
#include "bitstream.h"
extern const uint8_t ff_interleaved_golomb_vlc_len[256];
extern const uint8_t ff_interleaved_ue_golomb_vlc_code[256];
extern const int8_t ff_interleaved_se_golomb_vlc_code[256];
+extern const uint8_t ff_interleaved_dirac_golomb_vlc_code[256];
/**
static inline int svq3_get_ue_golomb(GetBitContext *gb){
uint32_t buf;
- int log;
OPEN_READER(re, gb);
UPDATE_CACHE(re, gb);
return ff_interleaved_ue_golomb_vlc_code[buf];
}else{
- LAST_SKIP_BITS(re, gb, 8);
- UPDATE_CACHE(re, gb);
- buf |= 1 | (GET_CACHE(re, gb) >> 8);
+ int ret = 1;
- if((buf & 0xAAAAAAAA) == 0)
- return INVALID_VLC;
+ while (1) {
+ buf >>= 32 - 8;
+ LAST_SKIP_BITS(re, gb, FFMIN(ff_interleaved_golomb_vlc_len[buf], 8));
- for(log=31; (buf & 0x80000000) == 0; log--){
- buf = (buf << 2) - ((buf << log) >> (log - 1)) + (buf >> 30);
+ if (ff_interleaved_golomb_vlc_len[buf] != 9){
+ ret <<= (ff_interleaved_golomb_vlc_len[buf] - 1) >> 1;
+ ret |= ff_interleaved_dirac_golomb_vlc_code[buf];
+ break;
+ }
+ ret = (ret << 4) | ff_interleaved_dirac_golomb_vlc_code[buf];
+ UPDATE_CACHE(re, gb);
+ buf = GET_CACHE(re, gb);
}
- LAST_SKIP_BITS(re, gb, 63 - 2*log - 8);
CLOSE_READER(re, gb);
-
- return ((buf << log) >> log) - 1;
+ return ret - 1;
}
}
}
}
+static inline int dirac_get_se_golomb(GetBitContext *gb){
+ uint32_t buf;
+ uint32_t ret;
+
+ ret = svq3_get_ue_golomb(gb);
+
+ if (ret) {
+ OPEN_READER(re, gb);
+ UPDATE_CACHE(re, gb);
+ buf = SHOW_SBITS(re, gb, 1);
+ LAST_SKIP_BITS(re, gb, 1);
+ ret = (ret ^ buf) - buf;
+ CLOSE_READER(re, gb);
+ }
+
+ return ret;
+}
+
/**
* read unsigned golomb rice code (ffv1).
*/
set_ur_golomb_jpegls(pb, v, k, limit, esc_len);
}
-#endif // AVCODEC_GOLOMB_H
+#endif /* FFMPEG_GOLOMB_H */