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author | Sean Bartell <wingedtachikoma@gmail.com> | 2011-06-25 21:32:25 -0400 |
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committer | Nils Wallménius <nils@rockbox.org> | 2012-04-25 22:13:20 +0200 |
commit | f40bfc9267b13b54e6379dfe7539447662879d24 (patch) | |
tree | 9b20069d5e62809ff434061ad730096836f916f2 /lib/rbcodec/codecs/libwmavoice/libavutil/lzo.c | |
parent | a0009907de7a0107d49040d8a180f140e2eff299 (diff) | |
download | rockbox-f40bfc9267b13b54e6379dfe7539447662879d24.tar.gz rockbox-f40bfc9267b13b54e6379dfe7539447662879d24.zip |
Add codecs to librbcodec.
Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97
Reviewed-on: http://gerrit.rockbox.org/137
Reviewed-by: Nils Wallménius <nils@rockbox.org>
Tested-by: Nils Wallménius <nils@rockbox.org>
Diffstat (limited to 'lib/rbcodec/codecs/libwmavoice/libavutil/lzo.c')
-rw-r--r-- | lib/rbcodec/codecs/libwmavoice/libavutil/lzo.c | 280 |
1 files changed, 280 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libwmavoice/libavutil/lzo.c b/lib/rbcodec/codecs/libwmavoice/libavutil/lzo.c new file mode 100644 index 0000000000..7f07cc2ee5 --- /dev/null +++ b/lib/rbcodec/codecs/libwmavoice/libavutil/lzo.c | |||
@@ -0,0 +1,280 @@ | |||
1 | /* | ||
2 | * LZO 1x decompression | ||
3 | * Copyright (c) 2006 Reimar Doeffinger | ||
4 | * | ||
5 | * This file is part of FFmpeg. | ||
6 | * | ||
7 | * FFmpeg is free software; you can redistribute it and/or | ||
8 | * modify it under the terms of the GNU Lesser General Public | ||
9 | * License as published by the Free Software Foundation; either | ||
10 | * version 2.1 of the License, or (at your option) any later version. | ||
11 | * | ||
12 | * FFmpeg is distributed in the hope that it will be useful, | ||
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
15 | * Lesser General Public License for more details. | ||
16 | * | ||
17 | * You should have received a copy of the GNU Lesser General Public | ||
18 | * License along with FFmpeg; if not, write to the Free Software | ||
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
20 | */ | ||
21 | |||
22 | #include "avutil.h" | ||
23 | #include "common.h" | ||
24 | //! Avoid e.g. MPlayers fast_memcpy, it slows things down here. | ||
25 | #undef memcpy | ||
26 | #include <string.h> | ||
27 | #include "lzo.h" | ||
28 | |||
29 | //! Define if we may write up to 12 bytes beyond the output buffer. | ||
30 | #define OUTBUF_PADDED 1 | ||
31 | //! Define if we may read up to 8 bytes beyond the input buffer. | ||
32 | #define INBUF_PADDED 1 | ||
33 | typedef struct LZOContext { | ||
34 | const uint8_t *in, *in_end; | ||
35 | uint8_t *out_start, *out, *out_end; | ||
36 | int error; | ||
37 | } LZOContext; | ||
38 | |||
39 | /** | ||
40 | * \brief Reads one byte from the input buffer, avoiding an overrun. | ||
41 | * \return byte read | ||
42 | */ | ||
43 | static inline int get_byte(LZOContext *c) { | ||
44 | if (c->in < c->in_end) | ||
45 | return *c->in++; | ||
46 | c->error |= AV_LZO_INPUT_DEPLETED; | ||
47 | return 1; | ||
48 | } | ||
49 | |||
50 | #ifdef INBUF_PADDED | ||
51 | #define GETB(c) (*(c).in++) | ||
52 | #else | ||
53 | #define GETB(c) get_byte(&(c)) | ||
54 | #endif | ||
55 | |||
56 | /** | ||
57 | * \brief Decodes a length value in the coding used by lzo. | ||
58 | * \param x previous byte value | ||
59 | * \param mask bits used from x | ||
60 | * \return decoded length value | ||
61 | */ | ||
62 | static inline int get_len(LZOContext *c, int x, int mask) { | ||
63 | int cnt = x & mask; | ||
64 | if (!cnt) { | ||
65 | while (!(x = get_byte(c))) cnt += 255; | ||
66 | cnt += mask + x; | ||
67 | } | ||
68 | return cnt; | ||
69 | } | ||
70 | |||
71 | //#define UNALIGNED_LOADSTORE | ||
72 | #define BUILTIN_MEMCPY | ||
73 | #ifdef UNALIGNED_LOADSTORE | ||
74 | #define COPY2(d, s) *(uint16_t *)(d) = *(uint16_t *)(s); | ||
75 | #define COPY4(d, s) *(uint32_t *)(d) = *(uint32_t *)(s); | ||
76 | #elif defined(BUILTIN_MEMCPY) | ||
77 | #define COPY2(d, s) memcpy(d, s, 2); | ||
78 | #define COPY4(d, s) memcpy(d, s, 4); | ||
79 | #else | ||
80 | #define COPY2(d, s) (d)[0] = (s)[0]; (d)[1] = (s)[1]; | ||
81 | #define COPY4(d, s) (d)[0] = (s)[0]; (d)[1] = (s)[1]; (d)[2] = (s)[2]; (d)[3] = (s)[3]; | ||
82 | #endif | ||
83 | |||
84 | /** | ||
85 | * \brief Copies bytes from input to output buffer with checking. | ||
86 | * \param cnt number of bytes to copy, must be >= 0 | ||
87 | */ | ||
88 | static inline void copy(LZOContext *c, int cnt) { | ||
89 | register const uint8_t *src = c->in; | ||
90 | register uint8_t *dst = c->out; | ||
91 | if (cnt > c->in_end - src) { | ||
92 | cnt = FFMAX(c->in_end - src, 0); | ||
93 | c->error |= AV_LZO_INPUT_DEPLETED; | ||
94 | } | ||
95 | if (cnt > c->out_end - dst) { | ||
96 | cnt = FFMAX(c->out_end - dst, 0); | ||
97 | c->error |= AV_LZO_OUTPUT_FULL; | ||
98 | } | ||
99 | #if defined(INBUF_PADDED) && defined(OUTBUF_PADDED) | ||
100 | COPY4(dst, src); | ||
101 | src += 4; | ||
102 | dst += 4; | ||
103 | cnt -= 4; | ||
104 | if (cnt > 0) | ||
105 | #endif | ||
106 | memcpy(dst, src, cnt); | ||
107 | c->in = src + cnt; | ||
108 | c->out = dst + cnt; | ||
109 | } | ||
110 | |||
111 | static inline void memcpy_backptr(uint8_t *dst, int back, int cnt); | ||
112 | |||
113 | /** | ||
114 | * \brief Copies previously decoded bytes to current position. | ||
115 | * \param back how many bytes back we start | ||
116 | * \param cnt number of bytes to copy, must be >= 0 | ||
117 | * | ||
118 | * cnt > back is valid, this will copy the bytes we just copied, | ||
119 | * thus creating a repeating pattern with a period length of back. | ||
120 | */ | ||
121 | static inline void copy_backptr(LZOContext *c, int back, int cnt) { | ||
122 | register const uint8_t *src = &c->out[-back]; | ||
123 | register uint8_t *dst = c->out; | ||
124 | if (src < c->out_start || src > dst) { | ||
125 | c->error |= AV_LZO_INVALID_BACKPTR; | ||
126 | return; | ||
127 | } | ||
128 | if (cnt > c->out_end - dst) { | ||
129 | cnt = FFMAX(c->out_end - dst, 0); | ||
130 | c->error |= AV_LZO_OUTPUT_FULL; | ||
131 | } | ||
132 | memcpy_backptr(dst, back, cnt); | ||
133 | c->out = dst + cnt; | ||
134 | } | ||
135 | |||
136 | static inline void memcpy_backptr(uint8_t *dst, int back, int cnt) { | ||
137 | const uint8_t *src = &dst[-back]; | ||
138 | if (back == 1) { | ||
139 | memset(dst, *src, cnt); | ||
140 | } else { | ||
141 | #ifdef OUTBUF_PADDED | ||
142 | COPY2(dst, src); | ||
143 | COPY2(dst + 2, src + 2); | ||
144 | src += 4; | ||
145 | dst += 4; | ||
146 | cnt -= 4; | ||
147 | if (cnt > 0) { | ||
148 | COPY2(dst, src); | ||
149 | COPY2(dst + 2, src + 2); | ||
150 | COPY2(dst + 4, src + 4); | ||
151 | COPY2(dst + 6, src + 6); | ||
152 | src += 8; | ||
153 | dst += 8; | ||
154 | cnt -= 8; | ||
155 | } | ||
156 | #endif | ||
157 | if (cnt > 0) { | ||
158 | int blocklen = back; | ||
159 | while (cnt > blocklen) { | ||
160 | memcpy(dst, src, blocklen); | ||
161 | dst += blocklen; | ||
162 | cnt -= blocklen; | ||
163 | blocklen <<= 1; | ||
164 | } | ||
165 | memcpy(dst, src, cnt); | ||
166 | } | ||
167 | } | ||
168 | } | ||
169 | |||
170 | void av_memcpy_backptr(uint8_t *dst, int back, int cnt) { | ||
171 | memcpy_backptr(dst, back, cnt); | ||
172 | } | ||
173 | |||
174 | int av_lzo1x_decode(void *out, int *outlen, const void *in, int *inlen) { | ||
175 | int state= 0; | ||
176 | int x; | ||
177 | LZOContext c; | ||
178 | c.in = in; | ||
179 | c.in_end = (const uint8_t *)in + *inlen; | ||
180 | c.out = c.out_start = out; | ||
181 | c.out_end = (uint8_t *)out + * outlen; | ||
182 | c.error = 0; | ||
183 | x = GETB(c); | ||
184 | if (x > 17) { | ||
185 | copy(&c, x - 17); | ||
186 | x = GETB(c); | ||
187 | if (x < 16) c.error |= AV_LZO_ERROR; | ||
188 | } | ||
189 | if (c.in > c.in_end) | ||
190 | c.error |= AV_LZO_INPUT_DEPLETED; | ||
191 | while (!c.error) { | ||
192 | int cnt, back; | ||
193 | if (x > 15) { | ||
194 | if (x > 63) { | ||
195 | cnt = (x >> 5) - 1; | ||
196 | back = (GETB(c) << 3) + ((x >> 2) & 7) + 1; | ||
197 | } else if (x > 31) { | ||
198 | cnt = get_len(&c, x, 31); | ||
199 | x = GETB(c); | ||
200 | back = (GETB(c) << 6) + (x >> 2) + 1; | ||
201 | } else { | ||
202 | cnt = get_len(&c, x, 7); | ||
203 | back = (1 << 14) + ((x & 8) << 11); | ||
204 | x = GETB(c); | ||
205 | back += (GETB(c) << 6) + (x >> 2); | ||
206 | if (back == (1 << 14)) { | ||
207 | if (cnt != 1) | ||
208 | c.error |= AV_LZO_ERROR; | ||
209 | break; | ||
210 | } | ||
211 | } | ||
212 | } else if(!state){ | ||
213 | cnt = get_len(&c, x, 15); | ||
214 | copy(&c, cnt + 3); | ||
215 | x = GETB(c); | ||
216 | if (x > 15) | ||
217 | continue; | ||
218 | cnt = 1; | ||
219 | back = (1 << 11) + (GETB(c) << 2) + (x >> 2) + 1; | ||
220 | } else { | ||
221 | cnt = 0; | ||
222 | back = (GETB(c) << 2) + (x >> 2) + 1; | ||
223 | } | ||
224 | copy_backptr(&c, back, cnt + 2); | ||
225 | state= | ||
226 | cnt = x & 3; | ||
227 | copy(&c, cnt); | ||
228 | x = GETB(c); | ||
229 | } | ||
230 | *inlen = c.in_end - c.in; | ||
231 | if (c.in > c.in_end) | ||
232 | *inlen = 0; | ||
233 | *outlen = c.out_end - c.out; | ||
234 | return c.error; | ||
235 | } | ||
236 | |||
237 | #ifdef TEST | ||
238 | #include <stdio.h> | ||
239 | #include <lzo/lzo1x.h> | ||
240 | #include "log.h" | ||
241 | #define MAXSZ (10*1024*1024) | ||
242 | |||
243 | /* Define one of these to 1 if you wish to benchmark liblzo | ||
244 | * instead of our native implementation. */ | ||
245 | #define BENCHMARK_LIBLZO_SAFE 0 | ||
246 | #define BENCHMARK_LIBLZO_UNSAFE 0 | ||
247 | |||
248 | int main(int argc, char *argv[]) { | ||
249 | FILE *in = fopen(argv[1], "rb"); | ||
250 | uint8_t *orig = av_malloc(MAXSZ + 16); | ||
251 | uint8_t *comp = av_malloc(2*MAXSZ + 16); | ||
252 | uint8_t *decomp = av_malloc(MAXSZ + 16); | ||
253 | size_t s = fread(orig, 1, MAXSZ, in); | ||
254 | lzo_uint clen = 0; | ||
255 | long tmp[LZO1X_MEM_COMPRESS]; | ||
256 | int inlen, outlen; | ||
257 | int i; | ||
258 | av_log_set_level(AV_LOG_DEBUG); | ||
259 | lzo1x_999_compress(orig, s, comp, &clen, tmp); | ||
260 | for (i = 0; i < 300; i++) { | ||
261 | START_TIMER | ||
262 | inlen = clen; outlen = MAXSZ; | ||
263 | #if BENCHMARK_LIBLZO_SAFE | ||
264 | if (lzo1x_decompress_safe(comp, inlen, decomp, &outlen, NULL)) | ||
265 | #elif BENCHMARK_LIBLZO_UNSAFE | ||
266 | if (lzo1x_decompress(comp, inlen, decomp, &outlen, NULL)) | ||
267 | #else | ||
268 | if (av_lzo1x_decode(decomp, &outlen, comp, &inlen)) | ||
269 | #endif | ||
270 | av_log(NULL, AV_LOG_ERROR, "decompression error\n"); | ||
271 | STOP_TIMER("lzod") | ||
272 | } | ||
273 | if (memcmp(orig, decomp, s)) | ||
274 | av_log(NULL, AV_LOG_ERROR, "decompression incorrect\n"); | ||
275 | else | ||
276 | av_log(NULL, AV_LOG_ERROR, "decompression OK\n"); | ||
277 | fclose(in); | ||
278 | return 0; | ||
279 | } | ||
280 | #endif | ||