diff options
author | Andreas Rheinhardt <andreas.rheinhardt@outlook.com> | 2022-07-23 01:28:48 +0200 |
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committer | Andreas Rheinhardt <andreas.rheinhardt@outlook.com> | 2022-07-28 03:49:54 +0200 |
commit | 7ab9b30800c0847133fa23fc86d05029d0415fe2 (patch) | |
tree | 70c2b6edaed07416dc897d0c8ab6d07ba2f6c2fb /libavcodec/vpx_rac.c | |
parent | 80ad06ab1b33bfea25be618a64742d90468b36e6 (diff) |
avcodec/vp56: Move VP5-9 range coder functions to a header of their own
Also use a vpx prefix for them.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Diffstat (limited to 'libavcodec/vpx_rac.c')
-rw-r--r-- | libavcodec/vpx_rac.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/libavcodec/vpx_rac.c b/libavcodec/vpx_rac.c new file mode 100644 index 0000000000..cf02e9a19c --- /dev/null +++ b/libavcodec/vpx_rac.c @@ -0,0 +1,53 @@ +/* + * VP5/6/8 decoder + * Copyright (c) 2010 Fiona Glaser <fiona@x264.com> + * + * 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 + */ + +#include <stdint.h> +#include "libavutil/error.h" +#include "bytestream.h" +#include "vpx_rac.h" + +const uint8_t ff_vpx_norm_shift[256]= { + 8,7,6,6,5,5,5,5,4,4,4,4,4,4,4,4, + 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3, + 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, + 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, + 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, + 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, + 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, + 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +}; + +int ff_vpx_init_range_decoder(VPXRangeCoder *c, const uint8_t *buf, int buf_size) +{ + c->high = 255; + c->bits = -16; + c->buffer = buf; + c->end = buf + buf_size; + c->end_reached = 0; + if (buf_size < 1) + return AVERROR_INVALIDDATA; + c->code_word = bytestream_get_be24(&c->buffer); + return 0; +} |