diff options
Diffstat (limited to 'src/gallium/auxiliary/vl/vl_bitstream_parser.c')
| -rw-r--r-- | src/gallium/auxiliary/vl/vl_bitstream_parser.c | 167 |
1 files changed, 0 insertions, 167 deletions
diff --git a/src/gallium/auxiliary/vl/vl_bitstream_parser.c b/src/gallium/auxiliary/vl/vl_bitstream_parser.c deleted file mode 100644 index 3193ea5f41..0000000000 --- a/src/gallium/auxiliary/vl/vl_bitstream_parser.c +++ /dev/null @@ -1,167 +0,0 @@ -/************************************************************************** - * - * Copyright 2009 Younes Manton. - * All Rights Reserved. - * - * Permission is hereby granted, free of charge, to any person obtaining a - * copy of this software and associated documentation files (the - * "Software"), to deal in the Software without restriction, including - * without limitation the rights to use, copy, modify, merge, publish, - * distribute, sub license, and/or sell copies of the Software, and to - * permit persons to whom the Software is furnished to do so, subject to - * the following conditions: - * - * The above copyright notice and this permission notice (including the - * next paragraph) shall be included in all copies or substantial portions - * of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS - * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF - * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. - * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR - * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, - * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE - * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. - * - **************************************************************************/ - -#include "vl_bitstream_parser.h" -#include <assert.h> -#include <limits.h> -#include <util/u_memory.h> - -static unsigned -grab_bits(unsigned cursor, unsigned how_many_bits, unsigned bitstream_elt) -{ - unsigned excess_bits = sizeof(unsigned) * CHAR_BIT - how_many_bits - cursor; - - assert(cursor < sizeof(unsigned) * CHAR_BIT); - assert(how_many_bits > 0 && how_many_bits <= sizeof(unsigned) * CHAR_BIT); - assert(cursor + how_many_bits <= sizeof(unsigned) * CHAR_BIT); - - return (bitstream_elt << excess_bits) >> (excess_bits + cursor); -} - -static unsigned -show_bits(unsigned cursor, unsigned how_many_bits, const unsigned *bitstream) -{ - unsigned cur_int = cursor / (sizeof(unsigned) * CHAR_BIT); - unsigned cur_bit = cursor % (sizeof(unsigned) * CHAR_BIT); - - assert(bitstream); - - if (cur_bit + how_many_bits > sizeof(unsigned) * CHAR_BIT) { - unsigned lower = grab_bits(cur_bit, sizeof(unsigned) * CHAR_BIT - cur_bit, - bitstream[cur_int]); - unsigned upper = grab_bits(0, cur_bit + how_many_bits - sizeof(unsigned) * CHAR_BIT, - bitstream[cur_int + 1]); - return lower | upper << (sizeof(unsigned) * CHAR_BIT - cur_bit); - } - else - return grab_bits(cur_bit, how_many_bits, bitstream[cur_int]); -} - -bool vl_bitstream_parser_init(struct vl_bitstream_parser *parser, - unsigned num_bitstreams, - const void **bitstreams, - const unsigned *sizes) -{ - assert(parser); - assert(num_bitstreams); - assert(bitstreams); - assert(sizes); - - parser->num_bitstreams = num_bitstreams; - parser->bitstreams = (const unsigned**)bitstreams; - parser->sizes = sizes; - parser->cur_bitstream = 0; - parser->cursor = 0; - - return true; -} - -void vl_bitstream_parser_cleanup(struct vl_bitstream_parser *parser) -{ - assert(parser); -} - -unsigned -vl_bitstream_parser_get_bits(struct vl_bitstream_parser *parser, - unsigned how_many_bits) -{ - unsigned bits; - - assert(parser); - - bits = vl_bitstream_parser_show_bits(parser, how_many_bits); - - vl_bitstream_parser_forward(parser, how_many_bits); - - return bits; -} - -unsigned -vl_bitstream_parser_show_bits(struct vl_bitstream_parser *parser, - unsigned how_many_bits) -{ - unsigned bits = 0; - unsigned shift = 0; - unsigned cursor; - unsigned cur_bitstream; - - assert(parser); - - cursor = parser->cursor; - cur_bitstream = parser->cur_bitstream; - - while (1) { - unsigned bits_left = parser->sizes[cur_bitstream] * CHAR_BIT - cursor; - unsigned bits_to_show = how_many_bits > bits_left ? bits_left : how_many_bits; - - bits |= show_bits(cursor, bits_to_show, - parser->bitstreams[cur_bitstream]) << shift; - - if (how_many_bits > bits_to_show) { - how_many_bits -= bits_to_show; - cursor = 0; - ++cur_bitstream; - shift += bits_to_show; - } - else - break; - } - - return bits; -} - -void vl_bitstream_parser_forward(struct vl_bitstream_parser *parser, - unsigned how_many_bits) -{ - assert(parser); - assert(how_many_bits); - - parser->cursor += how_many_bits; - - while (parser->cursor > parser->sizes[parser->cur_bitstream] * CHAR_BIT) { - parser->cursor -= parser->sizes[parser->cur_bitstream++] * CHAR_BIT; - assert(parser->cur_bitstream < parser->num_bitstreams); - } -} - -void vl_bitstream_parser_rewind(struct vl_bitstream_parser *parser, - unsigned how_many_bits) -{ - signed c; - - assert(parser); - assert(how_many_bits); - - c = parser->cursor - how_many_bits; - - while (c < 0) { - c += parser->sizes[parser->cur_bitstream--] * CHAR_BIT; - assert(parser->cur_bitstream < parser->num_bitstreams); - } - - parser->cursor = (unsigned)c; -} |