diff options
author | Marcoen Hirschberg <marcoen@gmail.com> | 2005-02-17 09:08:18 +0000 |
---|---|---|
committer | Marcoen Hirschberg <marcoen@gmail.com> | 2005-02-17 09:08:18 +0000 |
commit | 99d2599b79649fd5a7df13b4e43383c428cc5657 (patch) | |
tree | 5512330f8ad66d5bae14a0ed990601e3bf29f520 /apps/codecs/Tremor/floor1.c | |
parent | e3e116d3c732c99d95fe11f11726ed8a5b587fc4 (diff) | |
download | rockbox-99d2599b79649fd5a7df13b4e43383c428cc5657.tar.gz rockbox-99d2599b79649fd5a7df13b4e43383c428cc5657.zip |
Initial commit of the the Ogg Vorbis 'Tremor' integer playback codec
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5996 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'apps/codecs/Tremor/floor1.c')
-rw-r--r-- | apps/codecs/Tremor/floor1.c | 438 |
1 files changed, 438 insertions, 0 deletions
diff --git a/apps/codecs/Tremor/floor1.c b/apps/codecs/Tremor/floor1.c new file mode 100644 index 0000000000..21dd5bef79 --- /dev/null +++ b/apps/codecs/Tremor/floor1.c | |||
@@ -0,0 +1,438 @@ | |||
1 | /******************************************************************** | ||
2 | * * | ||
3 | * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. * | ||
4 | * * | ||
5 | * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * | ||
6 | * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * | ||
7 | * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * | ||
8 | * * | ||
9 | * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002 * | ||
10 | * BY THE Xiph.Org FOUNDATION http://www.xiph.org/ * | ||
11 | * * | ||
12 | ******************************************************************** | ||
13 | |||
14 | function: floor backend 1 implementation | ||
15 | |||
16 | ********************************************************************/ | ||
17 | |||
18 | #include <stdlib.h> | ||
19 | #include <string.h> | ||
20 | #include <math.h> | ||
21 | #include "ogg.h" | ||
22 | #include "ivorbiscodec.h" | ||
23 | #include "codec_internal.h" | ||
24 | #include "registry.h" | ||
25 | #include "codebook.h" | ||
26 | #include "misc.h" | ||
27 | |||
28 | #define floor1_rangedB 140 /* floor 1 fixed at -140dB to 0dB range */ | ||
29 | |||
30 | typedef struct { | ||
31 | int forward_index[VIF_POSIT+2]; | ||
32 | |||
33 | int hineighbor[VIF_POSIT]; | ||
34 | int loneighbor[VIF_POSIT]; | ||
35 | int posts; | ||
36 | |||
37 | int n; | ||
38 | int quant_q; | ||
39 | vorbis_info_floor1 *vi; | ||
40 | |||
41 | } vorbis_look_floor1; | ||
42 | |||
43 | /***********************************************/ | ||
44 | |||
45 | static void floor1_free_info(vorbis_info_floor *i){ | ||
46 | vorbis_info_floor1 *info=(vorbis_info_floor1 *)i; | ||
47 | if(info){ | ||
48 | memset(info,0,sizeof(*info)); | ||
49 | _ogg_free(info); | ||
50 | } | ||
51 | } | ||
52 | |||
53 | static void floor1_free_look(vorbis_look_floor *i){ | ||
54 | vorbis_look_floor1 *look=(vorbis_look_floor1 *)i; | ||
55 | if(look){ | ||
56 | memset(look,0,sizeof(*look)); | ||
57 | _ogg_free(look); | ||
58 | } | ||
59 | } | ||
60 | |||
61 | static int ilog(unsigned int v){ | ||
62 | int ret=0; | ||
63 | while(v){ | ||
64 | ret++; | ||
65 | v>>=1; | ||
66 | } | ||
67 | return(ret); | ||
68 | } | ||
69 | |||
70 | static vorbis_info_floor *floor1_unpack (vorbis_info *vi,oggpack_buffer *opb){ | ||
71 | codec_setup_info *ci=(codec_setup_info *)vi->codec_setup; | ||
72 | int j,k,count=0,maxclass=-1,rangebits; | ||
73 | |||
74 | vorbis_info_floor1 *info=(vorbis_info_floor1 *)_ogg_calloc(1,sizeof(*info)); | ||
75 | /* read partitions */ | ||
76 | info->partitions=oggpack_read(opb,5); /* only 0 to 31 legal */ | ||
77 | for(j=0;j<info->partitions;j++){ | ||
78 | info->partitionclass[j]=oggpack_read(opb,4); /* only 0 to 15 legal */ | ||
79 | if(maxclass<info->partitionclass[j])maxclass=info->partitionclass[j]; | ||
80 | } | ||
81 | |||
82 | /* read partition classes */ | ||
83 | for(j=0;j<maxclass+1;j++){ | ||
84 | info->class_dim[j]=oggpack_read(opb,3)+1; /* 1 to 8 */ | ||
85 | info->class_subs[j]=oggpack_read(opb,2); /* 0,1,2,3 bits */ | ||
86 | if(info->class_subs[j]<0) | ||
87 | goto err_out; | ||
88 | if(info->class_subs[j])info->class_book[j]=oggpack_read(opb,8); | ||
89 | if(info->class_book[j]<0 || info->class_book[j]>=ci->books) | ||
90 | goto err_out; | ||
91 | for(k=0;k<(1<<info->class_subs[j]);k++){ | ||
92 | info->class_subbook[j][k]=oggpack_read(opb,8)-1; | ||
93 | if(info->class_subbook[j][k]<-1 || info->class_subbook[j][k]>=ci->books) | ||
94 | goto err_out; | ||
95 | } | ||
96 | } | ||
97 | |||
98 | /* read the post list */ | ||
99 | info->mult=oggpack_read(opb,2)+1; /* only 1,2,3,4 legal now */ | ||
100 | rangebits=oggpack_read(opb,4); | ||
101 | |||
102 | for(j=0,k=0;j<info->partitions;j++){ | ||
103 | count+=info->class_dim[info->partitionclass[j]]; | ||
104 | for(;k<count;k++){ | ||
105 | int t=info->postlist[k+2]=oggpack_read(opb,rangebits); | ||
106 | if(t<0 || t>=(1<<rangebits)) | ||
107 | goto err_out; | ||
108 | } | ||
109 | } | ||
110 | info->postlist[0]=0; | ||
111 | info->postlist[1]=1<<rangebits; | ||
112 | |||
113 | return(info); | ||
114 | |||
115 | err_out: | ||
116 | floor1_free_info(info); | ||
117 | return(NULL); | ||
118 | } | ||
119 | |||
120 | static int icomp(const void *a,const void *b){ | ||
121 | return(**(int **)a-**(int **)b); | ||
122 | } | ||
123 | |||
124 | static vorbis_look_floor *floor1_look(vorbis_dsp_state *vd,vorbis_info_mode *mi, | ||
125 | vorbis_info_floor *in){ | ||
126 | |||
127 | int *sortpointer[VIF_POSIT+2]; | ||
128 | vorbis_info_floor1 *info=(vorbis_info_floor1 *)in; | ||
129 | vorbis_look_floor1 *look=(vorbis_look_floor1 *)_ogg_calloc(1,sizeof(*look)); | ||
130 | int i,j,n=0; | ||
131 | |||
132 | look->vi=info; | ||
133 | look->n=info->postlist[1]; | ||
134 | |||
135 | /* we drop each position value in-between already decoded values, | ||
136 | and use linear interpolation to predict each new value past the | ||
137 | edges. The positions are read in the order of the position | ||
138 | list... we precompute the bounding positions in the lookup. Of | ||
139 | course, the neighbors can change (if a position is declined), but | ||
140 | this is an initial mapping */ | ||
141 | |||
142 | for(i=0;i<info->partitions;i++)n+=info->class_dim[info->partitionclass[i]]; | ||
143 | n+=2; | ||
144 | look->posts=n; | ||
145 | |||
146 | /* also store a sorted position index */ | ||
147 | for(i=0;i<n;i++)sortpointer[i]=info->postlist+i; | ||
148 | qsort(sortpointer,n,sizeof(*sortpointer),icomp); | ||
149 | |||
150 | /* points from sort order back to range number */ | ||
151 | for(i=0;i<n;i++)look->forward_index[i]=sortpointer[i]-info->postlist; | ||
152 | |||
153 | /* quantize values to multiplier spec */ | ||
154 | switch(info->mult){ | ||
155 | case 1: /* 1024 -> 256 */ | ||
156 | look->quant_q=256; | ||
157 | break; | ||
158 | case 2: /* 1024 -> 128 */ | ||
159 | look->quant_q=128; | ||
160 | break; | ||
161 | case 3: /* 1024 -> 86 */ | ||
162 | look->quant_q=86; | ||
163 | break; | ||
164 | case 4: /* 1024 -> 64 */ | ||
165 | look->quant_q=64; | ||
166 | break; | ||
167 | } | ||
168 | |||
169 | /* discover our neighbors for decode where we don't use fit flags | ||
170 | (that would push the neighbors outward) */ | ||
171 | for(i=0;i<n-2;i++){ | ||
172 | int lo=0; | ||
173 | int hi=1; | ||
174 | int lx=0; | ||
175 | int hx=look->n; | ||
176 | int currentx=info->postlist[i+2]; | ||
177 | for(j=0;j<i+2;j++){ | ||
178 | int x=info->postlist[j]; | ||
179 | if(x>lx && x<currentx){ | ||
180 | lo=j; | ||
181 | lx=x; | ||
182 | } | ||
183 | if(x<hx && x>currentx){ | ||
184 | hi=j; | ||
185 | hx=x; | ||
186 | } | ||
187 | } | ||
188 | look->loneighbor[i]=lo; | ||
189 | look->hineighbor[i]=hi; | ||
190 | } | ||
191 | |||
192 | return(look); | ||
193 | } | ||
194 | |||
195 | static int render_point(int x0,int x1,int y0,int y1,int x){ | ||
196 | y0&=0x7fff; /* mask off flag */ | ||
197 | y1&=0x7fff; | ||
198 | |||
199 | { | ||
200 | int dy=y1-y0; | ||
201 | int adx=x1-x0; | ||
202 | int ady=abs(dy); | ||
203 | int err=ady*(x-x0); | ||
204 | |||
205 | int off=err/adx; | ||
206 | if(dy<0)return(y0-off); | ||
207 | return(y0+off); | ||
208 | } | ||
209 | } | ||
210 | |||
211 | #ifdef _LOW_ACCURACY_ | ||
212 | # define XdB(n) ((((n)>>8)+1)>>1) | ||
213 | #else | ||
214 | # define XdB(n) (n) | ||
215 | #endif | ||
216 | |||
217 | static const ogg_int32_t FLOOR_fromdB_LOOKUP[256]={ | ||
218 | XdB(0x000000e5), XdB(0x000000f4), XdB(0x00000103), XdB(0x00000114), | ||
219 | XdB(0x00000126), XdB(0x00000139), XdB(0x0000014e), XdB(0x00000163), | ||
220 | XdB(0x0000017a), XdB(0x00000193), XdB(0x000001ad), XdB(0x000001c9), | ||
221 | XdB(0x000001e7), XdB(0x00000206), XdB(0x00000228), XdB(0x0000024c), | ||
222 | XdB(0x00000272), XdB(0x0000029b), XdB(0x000002c6), XdB(0x000002f4), | ||
223 | XdB(0x00000326), XdB(0x0000035a), XdB(0x00000392), XdB(0x000003cd), | ||
224 | XdB(0x0000040c), XdB(0x00000450), XdB(0x00000497), XdB(0x000004e4), | ||
225 | XdB(0x00000535), XdB(0x0000058c), XdB(0x000005e8), XdB(0x0000064a), | ||
226 | XdB(0x000006b3), XdB(0x00000722), XdB(0x00000799), XdB(0x00000818), | ||
227 | XdB(0x0000089e), XdB(0x0000092e), XdB(0x000009c6), XdB(0x00000a69), | ||
228 | XdB(0x00000b16), XdB(0x00000bcf), XdB(0x00000c93), XdB(0x00000d64), | ||
229 | XdB(0x00000e43), XdB(0x00000f30), XdB(0x0000102d), XdB(0x0000113a), | ||
230 | XdB(0x00001258), XdB(0x0000138a), XdB(0x000014cf), XdB(0x00001629), | ||
231 | XdB(0x0000179a), XdB(0x00001922), XdB(0x00001ac4), XdB(0x00001c82), | ||
232 | XdB(0x00001e5c), XdB(0x00002055), XdB(0x0000226f), XdB(0x000024ac), | ||
233 | XdB(0x0000270e), XdB(0x00002997), XdB(0x00002c4b), XdB(0x00002f2c), | ||
234 | XdB(0x0000323d), XdB(0x00003581), XdB(0x000038fb), XdB(0x00003caf), | ||
235 | XdB(0x000040a0), XdB(0x000044d3), XdB(0x0000494c), XdB(0x00004e10), | ||
236 | XdB(0x00005323), XdB(0x0000588a), XdB(0x00005e4b), XdB(0x0000646b), | ||
237 | XdB(0x00006af2), XdB(0x000071e5), XdB(0x0000794c), XdB(0x0000812e), | ||
238 | XdB(0x00008993), XdB(0x00009283), XdB(0x00009c09), XdB(0x0000a62d), | ||
239 | XdB(0x0000b0f9), XdB(0x0000bc79), XdB(0x0000c8b9), XdB(0x0000d5c4), | ||
240 | XdB(0x0000e3a9), XdB(0x0000f274), XdB(0x00010235), XdB(0x000112fd), | ||
241 | XdB(0x000124dc), XdB(0x000137e4), XdB(0x00014c29), XdB(0x000161bf), | ||
242 | XdB(0x000178bc), XdB(0x00019137), XdB(0x0001ab4a), XdB(0x0001c70e), | ||
243 | XdB(0x0001e4a1), XdB(0x0002041f), XdB(0x000225aa), XdB(0x00024962), | ||
244 | XdB(0x00026f6d), XdB(0x000297f0), XdB(0x0002c316), XdB(0x0002f109), | ||
245 | XdB(0x000321f9), XdB(0x00035616), XdB(0x00038d97), XdB(0x0003c8b4), | ||
246 | XdB(0x000407a7), XdB(0x00044ab2), XdB(0x00049218), XdB(0x0004de23), | ||
247 | XdB(0x00052f1e), XdB(0x0005855c), XdB(0x0005e135), XdB(0x00064306), | ||
248 | XdB(0x0006ab33), XdB(0x00071a24), XdB(0x0007904b), XdB(0x00080e20), | ||
249 | XdB(0x00089422), XdB(0x000922da), XdB(0x0009bad8), XdB(0x000a5cb6), | ||
250 | XdB(0x000b091a), XdB(0x000bc0b1), XdB(0x000c8436), XdB(0x000d5471), | ||
251 | XdB(0x000e3233), XdB(0x000f1e5f), XdB(0x001019e4), XdB(0x001125c1), | ||
252 | XdB(0x00124306), XdB(0x001372d5), XdB(0x0014b663), XdB(0x00160ef7), | ||
253 | XdB(0x00177df0), XdB(0x001904c1), XdB(0x001aa4f9), XdB(0x001c603d), | ||
254 | XdB(0x001e384f), XdB(0x00202f0f), XdB(0x0022467a), XdB(0x002480b1), | ||
255 | XdB(0x0026dff7), XdB(0x002966b3), XdB(0x002c1776), XdB(0x002ef4fc), | ||
256 | XdB(0x0032022d), XdB(0x00354222), XdB(0x0038b828), XdB(0x003c67c2), | ||
257 | XdB(0x004054ae), XdB(0x004482e8), XdB(0x0048f6af), XdB(0x004db488), | ||
258 | XdB(0x0052c142), XdB(0x005821ff), XdB(0x005ddc33), XdB(0x0063f5b0), | ||
259 | XdB(0x006a74a7), XdB(0x00715faf), XdB(0x0078bdce), XdB(0x0080967f), | ||
260 | XdB(0x0088f1ba), XdB(0x0091d7f9), XdB(0x009b5247), XdB(0x00a56a41), | ||
261 | XdB(0x00b02a27), XdB(0x00bb9ce2), XdB(0x00c7ce12), XdB(0x00d4ca17), | ||
262 | XdB(0x00e29e20), XdB(0x00f15835), XdB(0x0101074b), XdB(0x0111bb4e), | ||
263 | XdB(0x01238531), XdB(0x01367704), XdB(0x014aa402), XdB(0x016020a7), | ||
264 | XdB(0x017702c3), XdB(0x018f6190), XdB(0x01a955cb), XdB(0x01c4f9cf), | ||
265 | XdB(0x01e269a8), XdB(0x0201c33b), XdB(0x0223265a), XdB(0x0246b4ea), | ||
266 | XdB(0x026c9302), XdB(0x0294e716), XdB(0x02bfda13), XdB(0x02ed9793), | ||
267 | XdB(0x031e4e09), XdB(0x03522ee4), XdB(0x03896ed0), XdB(0x03c445e2), | ||
268 | XdB(0x0402efd6), XdB(0x0445ac4b), XdB(0x048cbefc), XdB(0x04d87013), | ||
269 | XdB(0x05290c67), XdB(0x057ee5ca), XdB(0x05da5364), XdB(0x063bb204), | ||
270 | XdB(0x06a36485), XdB(0x0711d42b), XdB(0x0787710e), XdB(0x0804b299), | ||
271 | XdB(0x088a17ef), XdB(0x0918287e), XdB(0x09af747c), XdB(0x0a50957e), | ||
272 | XdB(0x0afc2f19), XdB(0x0bb2ef7f), XdB(0x0c759034), XdB(0x0d44d6ca), | ||
273 | XdB(0x0e2195bc), XdB(0x0f0cad0d), XdB(0x10070b62), XdB(0x1111aeea), | ||
274 | XdB(0x122da66c), XdB(0x135c120f), XdB(0x149e24d9), XdB(0x15f525b1), | ||
275 | XdB(0x176270e3), XdB(0x18e7794b), XdB(0x1a85c9ae), XdB(0x1c3f06d1), | ||
276 | XdB(0x1e14f07d), XdB(0x200963d7), XdB(0x221e5ccd), XdB(0x2455f870), | ||
277 | XdB(0x26b2770b), XdB(0x29363e2b), XdB(0x2be3db5c), XdB(0x2ebe06b6), | ||
278 | XdB(0x31c7a55b), XdB(0x3503ccd4), XdB(0x3875c5aa), XdB(0x3c210f44), | ||
279 | XdB(0x4009632b), XdB(0x4432b8cf), XdB(0x48a149bc), XdB(0x4d59959e), | ||
280 | XdB(0x52606733), XdB(0x57bad899), XdB(0x5d6e593a), XdB(0x6380b298), | ||
281 | XdB(0x69f80e9a), XdB(0x70dafda8), XdB(0x78307d76), XdB(0x7fffffff), | ||
282 | }; | ||
283 | |||
284 | static void render_line(int x0,int x1,int y0,int y1,ogg_int32_t *d){ | ||
285 | int dy=y1-y0; | ||
286 | int adx=x1-x0; | ||
287 | int ady=abs(dy); | ||
288 | int base=dy/adx; | ||
289 | int sy=(dy<0?base-1:base+1); | ||
290 | int x=x0; | ||
291 | int y=y0; | ||
292 | int err=0; | ||
293 | |||
294 | ady-=abs(base*adx); | ||
295 | |||
296 | d[x]= MULT31_SHIFT15(d[x],FLOOR_fromdB_LOOKUP[y]); | ||
297 | |||
298 | while(++x<x1){ | ||
299 | err=err+ady; | ||
300 | if(err>=adx){ | ||
301 | err-=adx; | ||
302 | y+=sy; | ||
303 | }else{ | ||
304 | y+=base; | ||
305 | } | ||
306 | d[x]= MULT31_SHIFT15(d[x],FLOOR_fromdB_LOOKUP[y]); | ||
307 | } | ||
308 | } | ||
309 | |||
310 | static void *floor1_inverse1(vorbis_block *vb,vorbis_look_floor *in){ | ||
311 | vorbis_look_floor1 *look=(vorbis_look_floor1 *)in; | ||
312 | vorbis_info_floor1 *info=look->vi; | ||
313 | codec_setup_info *ci=(codec_setup_info *)vb->vd->vi->codec_setup; | ||
314 | |||
315 | int i,j,k; | ||
316 | codebook *books=ci->fullbooks; | ||
317 | |||
318 | /* unpack wrapped/predicted values from stream */ | ||
319 | if(oggpack_read(&vb->opb,1)==1){ | ||
320 | int *fit_value=(int *)_vorbis_block_alloc(vb,(look->posts)*sizeof(*fit_value)); | ||
321 | |||
322 | fit_value[0]=oggpack_read(&vb->opb,ilog(look->quant_q-1)); | ||
323 | fit_value[1]=oggpack_read(&vb->opb,ilog(look->quant_q-1)); | ||
324 | |||
325 | /* partition by partition */ | ||
326 | /* partition by partition */ | ||
327 | for(i=0,j=2;i<info->partitions;i++){ | ||
328 | int classv=info->partitionclass[i]; | ||
329 | int cdim=info->class_dim[classv]; | ||
330 | int csubbits=info->class_subs[classv]; | ||
331 | int csub=1<<csubbits; | ||
332 | int cval=0; | ||
333 | |||
334 | /* decode the partition's first stage cascade value */ | ||
335 | if(csubbits){ | ||
336 | cval=vorbis_book_decode(books+info->class_book[classv],&vb->opb); | ||
337 | |||
338 | if(cval==-1)goto eop; | ||
339 | } | ||
340 | |||
341 | for(k=0;k<cdim;k++){ | ||
342 | int book=info->class_subbook[classv][cval&(csub-1)]; | ||
343 | cval>>=csubbits; | ||
344 | if(book>=0){ | ||
345 | if((fit_value[j+k]=vorbis_book_decode(books+book,&vb->opb))==-1) | ||
346 | goto eop; | ||
347 | }else{ | ||
348 | fit_value[j+k]=0; | ||
349 | } | ||
350 | } | ||
351 | j+=cdim; | ||
352 | } | ||
353 | |||
354 | /* unwrap positive values and reconsitute via linear interpolation */ | ||
355 | for(i=2;i<look->posts;i++){ | ||
356 | int predicted=render_point(info->postlist[look->loneighbor[i-2]], | ||
357 | info->postlist[look->hineighbor[i-2]], | ||
358 | fit_value[look->loneighbor[i-2]], | ||
359 | fit_value[look->hineighbor[i-2]], | ||
360 | info->postlist[i]); | ||
361 | int hiroom=look->quant_q-predicted; | ||
362 | int loroom=predicted; | ||
363 | int room=(hiroom<loroom?hiroom:loroom)<<1; | ||
364 | int val=fit_value[i]; | ||
365 | |||
366 | if(val){ | ||
367 | if(val>=room){ | ||
368 | if(hiroom>loroom){ | ||
369 | val = val-loroom; | ||
370 | }else{ | ||
371 | val = -1-(val-hiroom); | ||
372 | } | ||
373 | }else{ | ||
374 | if(val&1){ | ||
375 | val= -((val+1)>>1); | ||
376 | }else{ | ||
377 | val>>=1; | ||
378 | } | ||
379 | } | ||
380 | |||
381 | fit_value[i]=val+predicted; | ||
382 | fit_value[look->loneighbor[i-2]]&=0x7fff; | ||
383 | fit_value[look->hineighbor[i-2]]&=0x7fff; | ||
384 | |||
385 | }else{ | ||
386 | fit_value[i]=predicted|0x8000; | ||
387 | } | ||
388 | |||
389 | } | ||
390 | |||
391 | return(fit_value); | ||
392 | } | ||
393 | eop: | ||
394 | return(NULL); | ||
395 | } | ||
396 | |||
397 | static int floor1_inverse2(vorbis_block *vb,vorbis_look_floor *in,void *memo, | ||
398 | ogg_int32_t *out){ | ||
399 | vorbis_look_floor1 *look=(vorbis_look_floor1 *)in; | ||
400 | vorbis_info_floor1 *info=look->vi; | ||
401 | |||
402 | codec_setup_info *ci=(codec_setup_info *)vb->vd->vi->codec_setup; | ||
403 | int n=ci->blocksizes[vb->W]/2; | ||
404 | int j; | ||
405 | |||
406 | if(memo){ | ||
407 | /* render the lines */ | ||
408 | int *fit_value=(int *)memo; | ||
409 | int hx=0; | ||
410 | int lx=0; | ||
411 | int ly=fit_value[0]*info->mult; | ||
412 | for(j=1;j<look->posts;j++){ | ||
413 | int current=look->forward_index[j]; | ||
414 | int hy=fit_value[current]&0x7fff; | ||
415 | if(hy==fit_value[current]){ | ||
416 | |||
417 | hy*=info->mult; | ||
418 | hx=info->postlist[current]; | ||
419 | |||
420 | render_line(lx,hx,ly,hy,out); | ||
421 | |||
422 | lx=hx; | ||
423 | ly=hy; | ||
424 | } | ||
425 | } | ||
426 | for(j=hx;j<n;j++)out[j]*=ly; /* be certain */ | ||
427 | return(1); | ||
428 | } | ||
429 | memset(out,0,sizeof(*out)*n); | ||
430 | return(0); | ||
431 | } | ||
432 | |||
433 | /* export hooks */ | ||
434 | vorbis_func_floor floor1_exportbundle={ | ||
435 | &floor1_unpack,&floor1_look,&floor1_free_info, | ||
436 | &floor1_free_look,&floor1_inverse1,&floor1_inverse2 | ||
437 | }; | ||
438 | |||