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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/demac/libdemac/decoder.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/demac/libdemac/decoder.c')
-rw-r--r-- | lib/rbcodec/codecs/demac/libdemac/decoder.c | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/demac/libdemac/decoder.c b/lib/rbcodec/codecs/demac/libdemac/decoder.c new file mode 100644 index 0000000000..b0339a75d9 --- /dev/null +++ b/lib/rbcodec/codecs/demac/libdemac/decoder.c | |||
@@ -0,0 +1,216 @@ | |||
1 | /* | ||
2 | |||
3 | libdemac - A Monkey's Audio decoder | ||
4 | |||
5 | $Id$ | ||
6 | |||
7 | Copyright (C) Dave Chapman 2007 | ||
8 | |||
9 | This program is free software; you can redistribute it and/or modify | ||
10 | it under the terms of the GNU General Public License as published by | ||
11 | the Free Software Foundation; either version 2 of the License, or | ||
12 | (at your option) any later version. | ||
13 | |||
14 | This program is distributed in the hope that it will be useful, | ||
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
17 | GNU General Public License for more details. | ||
18 | |||
19 | You should have received a copy of the GNU General Public License | ||
20 | along with this program; if not, write to the Free Software | ||
21 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA | ||
22 | |||
23 | */ | ||
24 | |||
25 | #include <inttypes.h> | ||
26 | #include <string.h> | ||
27 | |||
28 | #include "demac.h" | ||
29 | #include "predictor.h" | ||
30 | #include "entropy.h" | ||
31 | #include "filter.h" | ||
32 | #include "demac_config.h" | ||
33 | |||
34 | /* Statically allocate the filter buffers */ | ||
35 | |||
36 | #ifdef FILTER256_IRAM | ||
37 | static filter_int filterbuf32[(32*3 + FILTER_HISTORY_SIZE) * 2] | ||
38 | IBSS_ATTR_DEMAC MEM_ALIGN_ATTR; | ||
39 | /* 2432 or 4864 bytes */ | ||
40 | static filter_int filterbuf256[(256*3 + FILTER_HISTORY_SIZE) * 2] | ||
41 | IBSS_ATTR_DEMAC MEM_ALIGN_ATTR; | ||
42 | /* 5120 or 10240 bytes */ | ||
43 | #define FILTERBUF64 filterbuf256 | ||
44 | #define FILTERBUF32 filterbuf32 | ||
45 | #define FILTERBUF16 filterbuf32 | ||
46 | #else | ||
47 | static filter_int filterbuf64[(64*3 + FILTER_HISTORY_SIZE) * 2] | ||
48 | IBSS_ATTR_DEMAC MEM_ALIGN_ATTR; | ||
49 | /* 2432 or 4864 bytes */ | ||
50 | static filter_int filterbuf256[(256*3 + FILTER_HISTORY_SIZE) * 2] | ||
51 | MEM_ALIGN_ATTR; /* 5120 or 10240 bytes */ | ||
52 | #define FILTERBUF64 filterbuf64 | ||
53 | #define FILTERBUF32 filterbuf64 | ||
54 | #define FILTERBUF16 filterbuf64 | ||
55 | #endif | ||
56 | |||
57 | /* This is only needed for "insane" files, and no current Rockbox targets | ||
58 | can hope to decode them in realtime, except the Gigabeat S (at 528MHz). */ | ||
59 | static filter_int filterbuf1280[(1280*3 + FILTER_HISTORY_SIZE) * 2] | ||
60 | IBSS_ATTR_DEMAC_INSANEBUF MEM_ALIGN_ATTR; | ||
61 | /* 17408 or 34816 bytes */ | ||
62 | |||
63 | void init_frame_decoder(struct ape_ctx_t* ape_ctx, | ||
64 | unsigned char* inbuffer, int* firstbyte, | ||
65 | int* bytesconsumed) | ||
66 | { | ||
67 | init_entropy_decoder(ape_ctx, inbuffer, firstbyte, bytesconsumed); | ||
68 | //printf("CRC=0x%08x\n",ape_ctx->CRC); | ||
69 | //printf("Flags=0x%08x\n",ape_ctx->frameflags); | ||
70 | |||
71 | init_predictor_decoder(&ape_ctx->predictor); | ||
72 | |||
73 | switch (ape_ctx->compressiontype) | ||
74 | { | ||
75 | case 2000: | ||
76 | init_filter_16_11(FILTERBUF16); | ||
77 | break; | ||
78 | |||
79 | case 3000: | ||
80 | init_filter_64_11(FILTERBUF64); | ||
81 | break; | ||
82 | |||
83 | case 4000: | ||
84 | init_filter_256_13(filterbuf256); | ||
85 | init_filter_32_10(FILTERBUF32); | ||
86 | break; | ||
87 | |||
88 | case 5000: | ||
89 | init_filter_1280_15(filterbuf1280); | ||
90 | init_filter_256_13(filterbuf256); | ||
91 | init_filter_16_11(FILTERBUF32); | ||
92 | } | ||
93 | } | ||
94 | |||
95 | int ICODE_ATTR_DEMAC decode_chunk(struct ape_ctx_t* ape_ctx, | ||
96 | unsigned char* inbuffer, int* firstbyte, | ||
97 | int* bytesconsumed, | ||
98 | int32_t* decoded0, int32_t* decoded1, | ||
99 | int count) | ||
100 | { | ||
101 | int32_t left, right; | ||
102 | #ifdef ROCKBOX | ||
103 | int scale = (APE_OUTPUT_DEPTH - ape_ctx->bps); | ||
104 | #define SCALE(x) ((x) << scale) | ||
105 | #else | ||
106 | #define SCALE(x) (x) | ||
107 | #endif | ||
108 | |||
109 | if ((ape_ctx->channels==1) || ((ape_ctx->frameflags | ||
110 | & (APE_FRAMECODE_PSEUDO_STEREO|APE_FRAMECODE_STEREO_SILENCE)) | ||
111 | == APE_FRAMECODE_PSEUDO_STEREO)) { | ||
112 | |||
113 | entropy_decode(ape_ctx, inbuffer, firstbyte, bytesconsumed, | ||
114 | decoded0, NULL, count); | ||
115 | |||
116 | if (ape_ctx->frameflags & APE_FRAMECODE_MONO_SILENCE) { | ||
117 | /* We are pure silence, so we're done. */ | ||
118 | return 0; | ||
119 | } | ||
120 | |||
121 | switch (ape_ctx->compressiontype) | ||
122 | { | ||
123 | case 2000: | ||
124 | apply_filter_16_11(ape_ctx->fileversion,0,decoded0,count); | ||
125 | break; | ||
126 | |||
127 | case 3000: | ||
128 | apply_filter_64_11(ape_ctx->fileversion,0,decoded0,count); | ||
129 | break; | ||
130 | |||
131 | case 4000: | ||
132 | apply_filter_32_10(ape_ctx->fileversion,0,decoded0,count); | ||
133 | apply_filter_256_13(ape_ctx->fileversion,0,decoded0,count); | ||
134 | break; | ||
135 | |||
136 | case 5000: | ||
137 | apply_filter_16_11(ape_ctx->fileversion,0,decoded0,count); | ||
138 | apply_filter_256_13(ape_ctx->fileversion,0,decoded0,count); | ||
139 | apply_filter_1280_15(ape_ctx->fileversion,0,decoded0,count); | ||
140 | } | ||
141 | |||
142 | /* Now apply the predictor decoding */ | ||
143 | predictor_decode_mono(&ape_ctx->predictor,decoded0,count); | ||
144 | |||
145 | if (ape_ctx->channels==2) { | ||
146 | /* Pseudo-stereo - copy left channel to right channel */ | ||
147 | while (count--) | ||
148 | { | ||
149 | left = *decoded0; | ||
150 | *(decoded1++) = *(decoded0++) = SCALE(left); | ||
151 | } | ||
152 | } | ||
153 | #ifdef ROCKBOX | ||
154 | else { | ||
155 | /* Scale to output depth */ | ||
156 | while (count--) | ||
157 | { | ||
158 | left = *decoded0; | ||
159 | *(decoded0++) = SCALE(left); | ||
160 | } | ||
161 | } | ||
162 | #endif | ||
163 | } else { /* Stereo */ | ||
164 | entropy_decode(ape_ctx, inbuffer, firstbyte, bytesconsumed, | ||
165 | decoded0, decoded1, count); | ||
166 | |||
167 | if ((ape_ctx->frameflags & APE_FRAMECODE_STEREO_SILENCE) | ||
168 | == APE_FRAMECODE_STEREO_SILENCE) { | ||
169 | /* We are pure silence, so we're done. */ | ||
170 | return 0; | ||
171 | } | ||
172 | |||
173 | /* Apply filters - compression type 1000 doesn't have any */ | ||
174 | switch (ape_ctx->compressiontype) | ||
175 | { | ||
176 | case 2000: | ||
177 | apply_filter_16_11(ape_ctx->fileversion,0,decoded0,count); | ||
178 | apply_filter_16_11(ape_ctx->fileversion,1,decoded1,count); | ||
179 | break; | ||
180 | |||
181 | case 3000: | ||
182 | apply_filter_64_11(ape_ctx->fileversion,0,decoded0,count); | ||
183 | apply_filter_64_11(ape_ctx->fileversion,1,decoded1,count); | ||
184 | break; | ||
185 | |||
186 | case 4000: | ||
187 | apply_filter_32_10(ape_ctx->fileversion,0,decoded0,count); | ||
188 | apply_filter_32_10(ape_ctx->fileversion,1,decoded1,count); | ||
189 | apply_filter_256_13(ape_ctx->fileversion,0,decoded0,count); | ||
190 | apply_filter_256_13(ape_ctx->fileversion,1,decoded1,count); | ||
191 | break; | ||
192 | |||
193 | case 5000: | ||
194 | apply_filter_16_11(ape_ctx->fileversion,0,decoded0,count); | ||
195 | apply_filter_16_11(ape_ctx->fileversion,1,decoded1,count); | ||
196 | apply_filter_256_13(ape_ctx->fileversion,0,decoded0,count); | ||
197 | apply_filter_256_13(ape_ctx->fileversion,1,decoded1,count); | ||
198 | apply_filter_1280_15(ape_ctx->fileversion,0,decoded0,count); | ||
199 | apply_filter_1280_15(ape_ctx->fileversion,1,decoded1,count); | ||
200 | } | ||
201 | |||
202 | /* Now apply the predictor decoding */ | ||
203 | predictor_decode_stereo(&ape_ctx->predictor,decoded0,decoded1,count); | ||
204 | |||
205 | /* Decorrelate and scale to output depth */ | ||
206 | while (count--) | ||
207 | { | ||
208 | left = *decoded1 - (*decoded0 / 2); | ||
209 | right = left + *decoded0; | ||
210 | |||
211 | *(decoded0++) = SCALE(left); | ||
212 | *(decoded1++) = SCALE(right); | ||
213 | } | ||
214 | } | ||
215 | return 0; | ||
216 | } | ||