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Diffstat (limited to 'src/gallium/auxiliary/vl/vl_vlc.h')
| -rw-r--r-- | src/gallium/auxiliary/vl/vl_vlc.h | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/vl/vl_vlc.h b/src/gallium/auxiliary/vl/vl_vlc.h new file mode 100644 index 00000000000..8c5b3aca47d --- /dev/null +++ b/src/gallium/auxiliary/vl/vl_vlc.h @@ -0,0 +1,138 @@ +/************************************************************************** + * + * Copyright 2011 Christian König. + * 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. + * + **************************************************************************/ + +/** + * This file is based uppon slice_xvmc.c and vlc.h from the xine project, + * which in turn is based on mpeg2dec. The following is the original copyright: + * + * Copyright (C) 2000-2002 Michel Lespinasse <[email protected]> + * Copyright (C) 1999-2000 Aaron Holtzman <[email protected]> + * + * This file is part of mpeg2dec, a free MPEG-2 video stream decoder. + * See http://libmpeg2.sourceforge.net/ for updates. + * + * mpeg2dec is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * mpeg2dec 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef vl_vlc_h +#define vl_vlc_h + +struct vl_vlc +{ + uint32_t buf; /* current 32 bit working set of buffer */ + int bits; /* used bits in working set */ + const uint8_t *ptr; /* buffer with stream data */ + const uint8_t *max; /* ptr+len of buffer */ +}; + +static inline void +vl_vlc_restart(struct vl_vlc *vlc) +{ + vlc->buf = (vlc->ptr[0] << 24) | (vlc->ptr[1] << 16) | (vlc->ptr[2] << 8) | vlc->ptr[3]; + vlc->bits = -16; + vlc->ptr += 4; +} + +static inline void +vl_vlc_init(struct vl_vlc *vlc, const uint8_t *data, unsigned len) +{ + vlc->ptr = data; + vlc->max = data + len; + vl_vlc_restart(vlc); +} + +static inline bool +vl_vlc_getbyte(struct vl_vlc *vlc) +{ + vlc->buf <<= 8; + vlc->buf |= vlc->ptr[0]; + vlc->ptr++; + return vlc->ptr < vlc->max; +} + +#define vl_vlc_getword(vlc, shift) \ +do { \ + (vlc)->buf |= (((vlc)->ptr[0] << 8) | (vlc)->ptr[1]) << (shift); \ + (vlc)->ptr += 2; \ +} while (0) + +/* make sure that there are at least 16 valid bits in bit_buf */ +#define vl_vlc_needbits(vlc) \ +do { \ + if ((vlc)->bits >= 0) { \ + vl_vlc_getword(vlc, (vlc)->bits); \ + (vlc)->bits -= 16; \ + } \ +} while (0) + +/* make sure that the full 32 bit of the buffer are valid */ +static inline void +vl_vlc_need32bits(struct vl_vlc *vlc) +{ + vl_vlc_needbits(vlc); + if (vlc->bits > -8) { + unsigned n = -vlc->bits; + vlc->buf <<= n; + vlc->buf |= *vlc->ptr << 8; + vlc->bits = -8; + vlc->ptr++; + } + if (vlc->bits > -16) { + unsigned n = -vlc->bits - 8; + vlc->buf <<= n; + vlc->buf |= *vlc->ptr; + vlc->bits = -16; + vlc->ptr++; + } +} + +/* remove num valid bits from bit_buf */ +#define vl_vlc_dumpbits(vlc, num) \ +do { \ + (vlc)->buf <<= (num); \ + (vlc)->bits += (num); \ +} while (0) + +/* take num bits from the high part of bit_buf and zero extend them */ +#define vl_vlc_ubits(vlc, num) (((uint32_t)((vlc)->buf)) >> (32 - (num))) + +/* take num bits from the high part of bit_buf and sign extend them */ +#define vl_vlc_sbits(vlc, num) (((int32_t)((vlc)->buf)) >> (32 - (num))) + +#endif /* vl_vlc_h */ |