diff options
Diffstat (limited to 'apps/codecs/libfaad/bits.c')
-rw-r--r-- | apps/codecs/libfaad/bits.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/apps/codecs/libfaad/bits.c b/apps/codecs/libfaad/bits.c new file mode 100644 index 0000000000..952a4a9df7 --- /dev/null +++ b/apps/codecs/libfaad/bits.c | |||
@@ -0,0 +1,213 @@ | |||
1 | /* | ||
2 | ** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding | ||
3 | ** Copyright (C) 2003-2004 M. Bakker, Ahead Software AG, http://www.nero.com | ||
4 | ** | ||
5 | ** This program is free software; you can redistribute it and/or modify | ||
6 | ** it under the terms of the GNU General Public License as published by | ||
7 | ** the Free Software Foundation; either version 2 of the License, or | ||
8 | ** (at your option) any later version. | ||
9 | ** | ||
10 | ** This program is distributed in the hope that it will be useful, | ||
11 | ** but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
13 | ** GNU General Public License for more details. | ||
14 | ** | ||
15 | ** You should have received a copy of the GNU General Public License | ||
16 | ** along with this program; if not, write to the Free Software | ||
17 | ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | ||
18 | ** | ||
19 | ** Any non-GPL usage of this software or parts of this software is strictly | ||
20 | ** forbidden. | ||
21 | ** | ||
22 | ** Commercial non-GPL licensing of this software is possible. | ||
23 | ** For more info contact Ahead Software through Mpeg4AAClicense@nero.com. | ||
24 | ** | ||
25 | ** $Id$ | ||
26 | **/ | ||
27 | |||
28 | #include "common.h" | ||
29 | #include "structs.h" | ||
30 | |||
31 | #include <stdlib.h> | ||
32 | #include <string.h> | ||
33 | #include "bits.h" | ||
34 | |||
35 | /* initialize buffer, call once before first getbits or showbits */ | ||
36 | void faad_initbits(bitfile *ld, const void *_buffer, const uint32_t buffer_size) | ||
37 | { | ||
38 | uint32_t tmp; | ||
39 | |||
40 | if (ld == NULL) | ||
41 | return; | ||
42 | |||
43 | memset(ld, 0, sizeof(bitfile)); | ||
44 | |||
45 | if (buffer_size == 0 || _buffer == NULL) | ||
46 | { | ||
47 | ld->error = 1; | ||
48 | ld->no_more_reading = 1; | ||
49 | return; | ||
50 | } | ||
51 | |||
52 | ld->buffer = faad_malloc((buffer_size+12)*sizeof(uint8_t)); | ||
53 | memset(ld->buffer, 0, (buffer_size+12)*sizeof(uint8_t)); | ||
54 | memcpy(ld->buffer, _buffer, buffer_size*sizeof(uint8_t)); | ||
55 | |||
56 | ld->buffer_size = buffer_size; | ||
57 | |||
58 | tmp = getdword((uint32_t*)ld->buffer); | ||
59 | ld->bufa = tmp; | ||
60 | |||
61 | tmp = getdword((uint32_t*)ld->buffer + 1); | ||
62 | ld->bufb = tmp; | ||
63 | |||
64 | ld->start = (uint32_t*)ld->buffer; | ||
65 | ld->tail = ((uint32_t*)ld->buffer + 2); | ||
66 | |||
67 | ld->bits_left = 32; | ||
68 | |||
69 | ld->bytes_used = 0; | ||
70 | ld->no_more_reading = 0; | ||
71 | ld->error = 0; | ||
72 | } | ||
73 | |||
74 | void faad_endbits(bitfile *ld) | ||
75 | { | ||
76 | if (ld) | ||
77 | { | ||
78 | if (ld->buffer) | ||
79 | { | ||
80 | faad_free(ld->buffer); | ||
81 | ld->buffer = NULL; | ||
82 | } | ||
83 | } | ||
84 | } | ||
85 | |||
86 | uint32_t faad_get_processed_bits(bitfile *ld) | ||
87 | { | ||
88 | return (uint32_t)(8 * (4*(ld->tail - ld->start) - 4) - (ld->bits_left)); | ||
89 | } | ||
90 | |||
91 | uint8_t faad_byte_align(bitfile *ld) | ||
92 | { | ||
93 | uint8_t remainder = (uint8_t)((32 - ld->bits_left) % 8); | ||
94 | |||
95 | if (remainder) | ||
96 | { | ||
97 | faad_flushbits(ld, 8 - remainder); | ||
98 | return (8 - remainder); | ||
99 | } | ||
100 | return 0; | ||
101 | } | ||
102 | |||
103 | void faad_flushbits_ex(bitfile *ld, uint32_t bits) | ||
104 | { | ||
105 | uint32_t tmp; | ||
106 | |||
107 | ld->bufa = ld->bufb; | ||
108 | if (ld->no_more_reading == 0) | ||
109 | { | ||
110 | tmp = getdword(ld->tail); | ||
111 | ld->tail++; | ||
112 | } else { | ||
113 | tmp = 0; | ||
114 | } | ||
115 | ld->bufb = tmp; | ||
116 | ld->bits_left += (32 - bits); | ||
117 | ld->bytes_used += 4; | ||
118 | if (ld->bytes_used == ld->buffer_size) | ||
119 | ld->no_more_reading = 1; | ||
120 | if (ld->bytes_used > ld->buffer_size) | ||
121 | ld->error = 1; | ||
122 | } | ||
123 | |||
124 | /* rewind to beginning */ | ||
125 | void faad_rewindbits(bitfile *ld) | ||
126 | { | ||
127 | uint32_t tmp; | ||
128 | |||
129 | tmp = ld->start[0]; | ||
130 | #ifndef ARCH_IS_BIG_ENDIAN | ||
131 | BSWAP(tmp); | ||
132 | #endif | ||
133 | ld->bufa = tmp; | ||
134 | |||
135 | tmp = ld->start[1]; | ||
136 | #ifndef ARCH_IS_BIG_ENDIAN | ||
137 | BSWAP(tmp); | ||
138 | #endif | ||
139 | ld->bufb = tmp; | ||
140 | ld->bits_left = 32; | ||
141 | ld->tail = &ld->start[2]; | ||
142 | ld->bytes_used = 0; | ||
143 | ld->no_more_reading = 0; | ||
144 | } | ||
145 | |||
146 | uint8_t *faad_getbitbuffer(bitfile *ld, uint32_t bits | ||
147 | DEBUGDEC) | ||
148 | { | ||
149 | uint16_t i; | ||
150 | uint8_t temp; | ||
151 | uint16_t bytes = (uint16_t)bits / 8; | ||
152 | uint8_t remainder = (uint8_t)bits % 8; | ||
153 | |||
154 | uint8_t *buffer = (uint8_t*)faad_malloc((bytes+1)*sizeof(uint8_t)); | ||
155 | |||
156 | for (i = 0; i < bytes; i++) | ||
157 | { | ||
158 | buffer[i] = (uint8_t)faad_getbits(ld, 8 DEBUGVAR(print,var,dbg)); | ||
159 | } | ||
160 | |||
161 | if (remainder) | ||
162 | { | ||
163 | temp = (uint8_t)faad_getbits(ld, remainder DEBUGVAR(print,var,dbg)) << (8-remainder); | ||
164 | |||
165 | buffer[bytes] = temp; | ||
166 | } | ||
167 | |||
168 | return buffer; | ||
169 | } | ||
170 | |||
171 | #ifdef DRM | ||
172 | /* return the original data buffer */ | ||
173 | void *faad_origbitbuffer(bitfile *ld) | ||
174 | { | ||
175 | return (void*)ld->start; | ||
176 | } | ||
177 | |||
178 | /* return the original data buffer size */ | ||
179 | uint32_t faad_origbitbuffer_size(bitfile *ld) | ||
180 | { | ||
181 | return ld->buffer_size; | ||
182 | } | ||
183 | #endif | ||
184 | |||
185 | /* reversed bit reading routines, used for RVLC and HCR */ | ||
186 | void faad_initbits_rev(bitfile *ld, void *buffer, | ||
187 | uint32_t bits_in_buffer) | ||
188 | { | ||
189 | uint32_t tmp; | ||
190 | int32_t index; | ||
191 | |||
192 | ld->buffer_size = bit2byte(bits_in_buffer); | ||
193 | |||
194 | index = (bits_in_buffer+31)/32 - 1; | ||
195 | |||
196 | ld->start = (uint32_t*)buffer + index - 2; | ||
197 | |||
198 | tmp = getdword((uint32_t*)buffer + index); | ||
199 | ld->bufa = tmp; | ||
200 | |||
201 | tmp = getdword((uint32_t*)buffer + index - 1); | ||
202 | ld->bufb = tmp; | ||
203 | |||
204 | ld->tail = (uint32_t*)buffer + index; | ||
205 | |||
206 | ld->bits_left = bits_in_buffer % 32; | ||
207 | if (ld->bits_left == 0) | ||
208 | ld->bits_left = 32; | ||
209 | |||
210 | ld->bytes_used = 0; | ||
211 | ld->no_more_reading = 0; | ||
212 | ld->error = 0; | ||
213 | } | ||