bitstream.h
上传用户:xjjlds
上传日期:2015-12-05
资源大小:22823k
文件大小:2k
- /*
- * bitstream.h
- * Copyright (C) 2004 Gildas Bazin <gbazin@videolan.org>
- * Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org>
- * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
- *
- * This file is part of dtsdec, a free DTS Coherent Acoustics stream decoder.
- * See http://www.videolan.org/dtsdec.html for updates.
- *
- * dtsdec 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.
- *
- * dtsdec 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
- */
- #ifdef WORDS_BIGENDIAN
- # define swab32(x) (x)
- #else
- # define swab32(x)
- ((((uint8_t*)&x)[0] << 24) | (((uint8_t*)&x)[1] << 16) |
- (((uint8_t*)&x)[2] << 8) | (((uint8_t*)&x)[3]))
- #endif
- #ifdef WORDS_BIGENDIAN
- # define swable32(x)
- ((((uint8_t*)&x)[0] << 16) | (((uint8_t*)&x)[1] << 24) |
- (((uint8_t*)&x)[2]) | (((uint8_t*)&x)[3] << 8))
- #else
- # define swable32(x)
- ((((uint16_t*)&x)[0] << 16) | (((uint16_t*)&x)[1]))
- #endif
- void dts_bitstream_init (dts_state_t * state, uint8_t * buf, int word_mode,
- int endian_mode);
- uint32_t dts_bitstream_get_bh (dts_state_t * state, uint32_t num_bits);
- static inline uint32_t bitstream_get (dts_state_t * state, uint32_t num_bits)
- {
- uint32_t result;
- if (num_bits < state->bits_left) {
- result = (state->current_word << (32 - state->bits_left))
- >> (32 - num_bits);
- state->bits_left -= num_bits;
- return result;
- }
- return dts_bitstream_get_bh (state, num_bits);
- }