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comparison: media/libvpx/vp8/encoder/boolhuff.h
media/libvpx/vp8/encoder/boolhuff.h
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| -1:000000000000 | 0:2206417acc8d |
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| 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 /**************************************************************************** | |
| 13 * | |
| 14 * Module Title : boolhuff.h | |
| 15 * | |
| 16 * Description : Bool Coder header file. | |
| 17 * | |
| 18 ****************************************************************************/ | |
| 19 #ifndef __INC_BOOLHUFF_H | |
| 20 #define __INC_BOOLHUFF_H | |
| 21 | |
| 22 #include "vpx_ports/mem.h" | |
| 23 #include "vpx/internal/vpx_codec_internal.h" | |
| 24 | |
| 25 typedef struct | |
| 26 { | |
| 27 unsigned int lowvalue; | |
| 28 unsigned int range; | |
| 29 int count; | |
| 30 unsigned int pos; | |
| 31 unsigned char *buffer; | |
| 32 unsigned char *buffer_end; | |
| 33 struct vpx_internal_error_info *error; | |
| 34 | |
| 35 /* Variables used to track bit costs without outputing to the bitstream */ | |
| 36 unsigned int measure_cost; | |
| 37 unsigned long bit_counter; | |
| 38 } BOOL_CODER; | |
| 39 | |
| 40 extern void vp8_start_encode(BOOL_CODER *bc, unsigned char *buffer, unsigned char *buffer_end); | |
| 41 | |
| 42 extern void vp8_encode_value(BOOL_CODER *br, int data, int bits); | |
| 43 extern void vp8_stop_encode(BOOL_CODER *bc); | |
| 44 extern const unsigned int vp8_prob_cost[256]; | |
| 45 | |
| 46 | |
| 47 DECLARE_ALIGNED(16, extern const unsigned char, vp8_norm[256]); | |
| 48 | |
| 49 static int validate_buffer(const unsigned char *start, | |
| 50 size_t len, | |
| 51 const unsigned char *end, | |
| 52 struct vpx_internal_error_info *error) | |
| 53 { | |
| 54 if (start + len > start && start + len < end) | |
| 55 return 1; | |
| 56 else | |
| 57 vpx_internal_error(error, VPX_CODEC_CORRUPT_FRAME, | |
| 58 "Truncated packet or corrupt partition "); | |
| 59 | |
| 60 return 0; | |
| 61 } | |
| 62 static void vp8_encode_bool(BOOL_CODER *br, int bit, int probability) | |
| 63 { | |
| 64 unsigned int split; | |
| 65 int count = br->count; | |
| 66 unsigned int range = br->range; | |
| 67 unsigned int lowvalue = br->lowvalue; | |
| 68 register unsigned int shift; | |
| 69 | |
| 70 #ifdef VP8_ENTROPY_STATS | |
| 71 #if defined(SECTIONBITS_OUTPUT) | |
| 72 | |
| 73 if (bit) | |
| 74 Sectionbits[active_section] += vp8_prob_cost[255-probability]; | |
| 75 else | |
| 76 Sectionbits[active_section] += vp8_prob_cost[probability]; | |
| 77 | |
| 78 #endif | |
| 79 #endif | |
| 80 | |
| 81 split = 1 + (((range - 1) * probability) >> 8); | |
| 82 | |
| 83 range = split; | |
| 84 | |
| 85 if (bit) | |
| 86 { | |
| 87 lowvalue += split; | |
| 88 range = br->range - split; | |
| 89 } | |
| 90 | |
| 91 shift = vp8_norm[range]; | |
| 92 | |
| 93 range <<= shift; | |
| 94 count += shift; | |
| 95 | |
| 96 if (count >= 0) | |
| 97 { | |
| 98 int offset = shift - count; | |
| 99 | |
| 100 if ((lowvalue << (offset - 1)) & 0x80000000) | |
| 101 { | |
| 102 int x = br->pos - 1; | |
| 103 | |
| 104 while (x >= 0 && br->buffer[x] == 0xff) | |
| 105 { | |
| 106 br->buffer[x] = (unsigned char)0; | |
| 107 x--; | |
| 108 } | |
| 109 | |
| 110 br->buffer[x] += 1; | |
| 111 } | |
| 112 | |
| 113 validate_buffer(br->buffer + br->pos, 1, br->buffer_end, br->error); | |
| 114 br->buffer[br->pos++] = (lowvalue >> (24 - offset)); | |
| 115 | |
| 116 lowvalue <<= offset; | |
| 117 shift = count; | |
| 118 lowvalue &= 0xffffff; | |
| 119 count -= 8 ; | |
| 120 } | |
| 121 | |
| 122 lowvalue <<= shift; | |
| 123 br->count = count; | |
| 124 br->lowvalue = lowvalue; | |
| 125 br->range = range; | |
| 126 } | |
| 127 | |
| 128 #endif |
