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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /media/ffvpx/libavcodec/vp89_rac.h | |
parent | Initial commit. (diff) | |
download | firefox-esr-upstream.tar.xz firefox-esr-upstream.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | media/ffvpx/libavcodec/vp89_rac.h | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/media/ffvpx/libavcodec/vp89_rac.h b/media/ffvpx/libavcodec/vp89_rac.h new file mode 100644 index 0000000000..bc0924c387 --- /dev/null +++ b/media/ffvpx/libavcodec/vp89_rac.h @@ -0,0 +1,66 @@ +/* + * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org> + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * Range decoder functions common to VP8 and VP9 + */ + +#ifndef AVCODEC_VP89_RAC_H +#define AVCODEC_VP89_RAC_H + +#include <stdint.h> + +#include "libavutil/attributes.h" + +#include "vpx_rac.h" + +// rounding is different than vpx_rac_get, is vpx_rac_get wrong? +static av_always_inline int vp89_rac_get(VPXRangeCoder *c) +{ + return vpx_rac_get_prob(c, 128); +} + +static av_unused int vp89_rac_get_uint(VPXRangeCoder *c, int bits) +{ + int value = 0; + + while (bits--) { + value = (value << 1) | vp89_rac_get(c); + } + + return value; +} + +// how probabilities are associated with decisions is different I think +// well, the new scheme fits in the old but this way has one fewer branches per decision +static av_always_inline int vp89_rac_get_tree(VPXRangeCoder *c, const int8_t (*tree)[2], + const uint8_t *probs) +{ + int i = 0; + + do { + i = tree[i][vpx_rac_get_prob(c, probs[i])]; + } while (i > 0); + + return -i; +} + +#endif /* AVCODEC_VP89_RAC_H */ |