1 /* 2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 12 #include "dboolhuff.h" 13 #include "vpx_ports/mem.h" 14 #include "vpx_mem/vpx_mem.h" 15 16 DECLARE_ALIGNED(16, const unsigned char, vp8dx_bitreader_norm[256]) = 17 { 18 0, 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, 19 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, 20 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, 21 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, 22 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, 23 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, 24 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, 25 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 26 }; 27 28 29 int vp8dx_start_decode(BOOL_DECODER *br, 30 const unsigned char *source, 31 unsigned int source_sz) 32 { 33 br->user_buffer_end = source+source_sz; 34 br->user_buffer = source; 35 br->value = 0; 36 br->count = -8; 37 br->range = 255; 38 39 if (source_sz && !source) 40 return 1; 41 42 /* Populate the buffer */ 43 vp8dx_bool_decoder_fill(br); 44 45 return 0; 46 } 47 48 49 void vp8dx_bool_decoder_fill(BOOL_DECODER *br) 50 { 51 const unsigned char *bufptr; 52 const unsigned char *bufend; 53 VP8_BD_VALUE value; 54 int count; 55 bufend = br->user_buffer_end; 56 bufptr = br->user_buffer; 57 value = br->value; 58 count = br->count; 59 60 VP8DX_BOOL_DECODER_FILL(count, value, bufptr, bufend); 61 62 br->user_buffer = bufptr; 63 br->value = value; 64 br->count = count; 65 } 66
