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Diffstat (limited to '')
| -rw-r--r-- | third_party/dav1d/src/getbits.h | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/third_party/dav1d/src/getbits.h b/third_party/dav1d/src/getbits.h new file mode 100644 index 0000000000..57b80dc714 --- /dev/null +++ b/third_party/dav1d/src/getbits.h @@ -0,0 +1,59 @@ +/* + * Copyright © 2018, VideoLAN and dav1d authors + * Copyright © 2018, Two Orioles, LLC + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR + * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef DAV1D_SRC_GETBITS_H +#define DAV1D_SRC_GETBITS_H + +#include <stddef.h> +#include <stdint.h> + +typedef struct GetBits { + uint64_t state; + int bits_left, error; + const uint8_t *ptr, *ptr_start, *ptr_end; +} GetBits; + +void dav1d_init_get_bits(GetBits *c, const uint8_t *data, size_t sz); +unsigned dav1d_get_bit(GetBits *c); +unsigned dav1d_get_bits(GetBits *c, int n); +int dav1d_get_sbits(GetBits *c, int n); +unsigned dav1d_get_uleb128(GetBits *c); + +// Output in range 0..max-1 +unsigned dav1d_get_uniform(GetBits *c, unsigned max); +unsigned dav1d_get_vlc(GetBits *c); +int dav1d_get_bits_subexp(GetBits *c, int ref, unsigned n); + +// Discard bits from the buffer until we're next byte-aligned. +void dav1d_bytealign_get_bits(GetBits *c); + +// Return the current bit position relative to the start of the buffer. +static inline unsigned dav1d_get_bits_pos(const GetBits *c) { + return (unsigned) (c->ptr - c->ptr_start) * 8 - c->bits_left; +} + +#endif /* DAV1D_SRC_GETBITS_H */ |