1 /*
2 ** Copyright (C) 2002-2013 Erik de Castro Lopo <erikd@mega-nerd.com>
3 **
4 ** This program is free software; you can redistribute it and/or modify
5 ** it under the terms of the GNU Lesser General Public License as published by
6 ** the Free Software Foundation; either version 2.1 of the License, or
7 ** (at your option) any later version.
8 **
9 ** This program is distributed in the hope that it will be useful,
10 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
11 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 ** GNU Lesser General Public License for more details.
13 **
14 ** You should have received a copy of the GNU Lesser General Public License
15 ** along with this program; if not, write to the Free Software
16 ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19 #include "sfendian.h"
20
21 #include <stdlib.h>
22
23 #include "sndfile.h"
24 #include "common.h"
25
26 #define INTERLEAVE_CHANNELS 6
27
28 typedef struct
29 { double buffer [SF_BUFFER_LEN / sizeof (double)] ;
30
31 sf_count_t channel_len ;
32
33 sf_count_t (*read_short) (SF_PRIVATE*, short *ptr, sf_count_t len) ;
34 sf_count_t (*read_int) (SF_PRIVATE*, int *ptr, sf_count_t len) ;
35 sf_count_t (*read_float) (SF_PRIVATE*, float *ptr, sf_count_t len) ;
36 sf_count_t (*read_double) (SF_PRIVATE*, double *ptr, sf_count_t len) ;
37
38 } INTERLEAVE_DATA ;
39
40
41
42 static sf_count_t interleave_read_short (SF_PRIVATE *psf, short *ptr, sf_count_t len) ;
43 static sf_count_t interleave_read_int (SF_PRIVATE *psf, int *ptr, sf_count_t len) ;
44 static sf_count_t interleave_read_float (SF_PRIVATE *psf, float *ptr, sf_count_t len) ;
45 static sf_count_t interleave_read_double (SF_PRIVATE *psf, double *ptr, sf_count_t len) ;
46
47 static sf_count_t interleave_seek (SF_PRIVATE*, int mode, sf_count_t samples_from_start) ;
48
49
50
51
52 int
interleave_init(SF_PRIVATE * psf)53 interleave_init (SF_PRIVATE *psf)
54 { INTERLEAVE_DATA *pdata ;
55
56 if (psf->file.mode != SFM_READ)
57 return SFE_INTERLEAVE_MODE ;
58
59 if (psf->interleave)
60 { psf_log_printf (psf, "*** Weird, already have interleave.\n") ;
61 return 666 ;
62 } ;
63
64 /* Free this in sf_close() function. */
65 if (! (pdata = malloc (sizeof (INTERLEAVE_DATA))))
66 return SFE_MALLOC_FAILED ;
67
68 puts ("interleave_init") ;
69
70 psf->interleave = pdata ;
71
72 /* Save the existing methods. */
73 pdata->read_short = psf->read_short ;
74 pdata->read_int = psf->read_int ;
75 pdata->read_float = psf->read_float ;
76 pdata->read_double = psf->read_double ;
77
78 pdata->channel_len = psf->sf.frames * psf->bytewidth ;
79
80 /* Insert our new methods. */
81 psf->read_short = interleave_read_short ;
82 psf->read_int = interleave_read_int ;
83 psf->read_float = interleave_read_float ;
84 psf->read_double = interleave_read_double ;
85
86 psf->seek = interleave_seek ;
87
88 return 0 ;
89 } /* pcm_interleave_init */
90
91 /*------------------------------------------------------------------------------
92 */
93
94 static sf_count_t
interleave_read_short(SF_PRIVATE * psf,short * ptr,sf_count_t len)95 interleave_read_short (SF_PRIVATE *psf, short *ptr, sf_count_t len)
96 { INTERLEAVE_DATA *pdata ;
97 sf_count_t offset, templen ;
98 int chan, count, k ;
99 short *inptr, *outptr ;
100
101 if (! (pdata = psf->interleave))
102 return 0 ;
103
104 inptr = (short*) pdata->buffer ;
105
106 for (chan = 0 ; chan < psf->sf.channels ; chan++)
107 { outptr = ptr + chan ;
108
109 offset = psf->dataoffset + chan * psf->bytewidth * psf->read_current ;
110
111 if (psf_fseek (psf, offset, SEEK_SET) != offset)
112 { psf->error = SFE_INTERLEAVE_SEEK ;
113 return 0 ;
114 } ;
115
116 templen = len / psf->sf.channels ;
117
118 while (templen > 0)
119 { if (templen > SIGNED_SIZEOF (pdata->buffer) / SIGNED_SIZEOF (short))
120 count = SIGNED_SIZEOF (pdata->buffer) / SIGNED_SIZEOF (short) ;
121 else
122 count = (int) templen ;
123
124 if (pdata->read_short (psf, inptr, count) != count)
125 { psf->error = SFE_INTERLEAVE_READ ;
126 return 0 ;
127 } ;
128
129 for (k = 0 ; k < count ; k++)
130 { *outptr = inptr [k] ;
131 outptr += psf->sf.channels ;
132 } ;
133
134 templen -= count ;
135 } ;
136 } ;
137
138 return len ;
139 } /* interleave_read_short */
140
141 static sf_count_t
interleave_read_int(SF_PRIVATE * psf,int * ptr,sf_count_t len)142 interleave_read_int (SF_PRIVATE *psf, int *ptr, sf_count_t len)
143 { INTERLEAVE_DATA *pdata ;
144 sf_count_t offset, templen ;
145 int chan, count, k ;
146 int *inptr, *outptr ;
147
148 if (! (pdata = psf->interleave))
149 return 0 ;
150
151 inptr = (int*) pdata->buffer ;
152
153 for (chan = 0 ; chan < psf->sf.channels ; chan++)
154 { outptr = ptr + chan ;
155
156 offset = psf->dataoffset + chan * psf->bytewidth * psf->read_current ;
157
158 if (psf_fseek (psf, offset, SEEK_SET) != offset)
159 { psf->error = SFE_INTERLEAVE_SEEK ;
160 return 0 ;
161 } ;
162
163 templen = len / psf->sf.channels ;
164
165 while (templen > 0)
166 { if (templen > SIGNED_SIZEOF (pdata->buffer) / SIGNED_SIZEOF (int))
167 count = SIGNED_SIZEOF (pdata->buffer) / SIGNED_SIZEOF (int) ;
168 else
169 count = (int) templen ;
170
171 if (pdata->read_int (psf, inptr, count) != count)
172 { psf->error = SFE_INTERLEAVE_READ ;
173 return 0 ;
174 } ;
175
176 for (k = 0 ; k < count ; k++)
177 { *outptr = inptr [k] ;
178 outptr += psf->sf.channels ;
179 } ;
180
181 templen -= count ;
182 } ;
183 } ;
184
185 return len ;
186 } /* interleave_read_int */
187
188 static sf_count_t
interleave_read_float(SF_PRIVATE * psf,float * ptr,sf_count_t len)189 interleave_read_float (SF_PRIVATE *psf, float *ptr, sf_count_t len)
190 { INTERLEAVE_DATA *pdata ;
191 sf_count_t offset, templen ;
192 int chan, count, k ;
193 float *inptr, *outptr ;
194
195 if (! (pdata = psf->interleave))
196 return 0 ;
197
198 inptr = (float*) pdata->buffer ;
199
200 for (chan = 0 ; chan < psf->sf.channels ; chan++)
201 { outptr = ptr + chan ;
202
203 offset = psf->dataoffset + pdata->channel_len * chan + psf->read_current * psf->bytewidth ;
204
205 /*-printf ("chan : %d read_current : %6lld offset : %6lld\n", chan, psf->read_current, offset) ;-*/
206
207 if (psf_fseek (psf, offset, SEEK_SET) != offset)
208 { psf->error = SFE_INTERLEAVE_SEEK ;
209 /*-puts ("interleave_seek error") ; exit (1) ;-*/
210 return 0 ;
211 } ;
212
213 templen = len / psf->sf.channels ;
214
215 while (templen > 0)
216 { if (templen > SIGNED_SIZEOF (pdata->buffer) / SIGNED_SIZEOF (float))
217 count = SIGNED_SIZEOF (pdata->buffer) / SIGNED_SIZEOF (float) ;
218 else
219 count = (int) templen ;
220
221 if (pdata->read_float (psf, inptr, count) != count)
222 { psf->error = SFE_INTERLEAVE_READ ;
223 /*-puts ("interleave_read error") ; exit (1) ;-*/
224 return 0 ;
225 } ;
226
227 for (k = 0 ; k < count ; k++)
228 { *outptr = inptr [k] ;
229 outptr += psf->sf.channels ;
230 } ;
231
232 templen -= count ;
233 } ;
234 } ;
235
236 return len ;
237 } /* interleave_read_float */
238
239 static sf_count_t
interleave_read_double(SF_PRIVATE * psf,double * ptr,sf_count_t len)240 interleave_read_double (SF_PRIVATE *psf, double *ptr, sf_count_t len)
241 { INTERLEAVE_DATA *pdata ;
242 sf_count_t offset, templen ;
243 int chan, count, k ;
244 double *inptr, *outptr ;
245
246 if (! (pdata = psf->interleave))
247 return 0 ;
248
249 inptr = (double*) pdata->buffer ;
250
251 for (chan = 0 ; chan < psf->sf.channels ; chan++)
252 { outptr = ptr + chan ;
253
254 offset = psf->dataoffset + chan * psf->bytewidth * psf->read_current ;
255
256 if (psf_fseek (psf, offset, SEEK_SET) != offset)
257 { psf->error = SFE_INTERLEAVE_SEEK ;
258 return 0 ;
259 } ;
260
261 templen = len / psf->sf.channels ;
262
263 while (templen > 0)
264 { if (templen > SIGNED_SIZEOF (pdata->buffer) / SIGNED_SIZEOF (double))
265 count = SIGNED_SIZEOF (pdata->buffer) / SIGNED_SIZEOF (double) ;
266 else
267 count = (int) templen ;
268
269 if (pdata->read_double (psf, inptr, count) != count)
270 { psf->error = SFE_INTERLEAVE_READ ;
271 return 0 ;
272 } ;
273
274 for (k = 0 ; k < count ; k++)
275 { *outptr = inptr [k] ;
276 outptr += psf->sf.channels ;
277 } ;
278
279 templen -= count ;
280 } ;
281 } ;
282
283 return len ;
284 } /* interleave_read_double */
285
286 /*------------------------------------------------------------------------------
287 */
288
289 static sf_count_t
interleave_seek(SF_PRIVATE * UNUSED (psf),int UNUSED (mode),sf_count_t samples_from_start)290 interleave_seek (SF_PRIVATE * UNUSED (psf), int UNUSED (mode), sf_count_t samples_from_start)
291 {
292 /*
293 ** Do nothing here. This is a place holder to prevent the default
294 ** seek function from being called.
295 */
296
297 return samples_from_start ;
298 } /* interleave_seek */
299
300