libsndfile source files.
[Faustine.git] / interpretor / libsndfile-1.0.25 / src / pvf.c
1 /*
2 ** Copyright (C) 2002-2011 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 "sfconfig.h"
20
21 #include <stdio.h>
22 #include <fcntl.h>
23 #include <string.h>
24 #include <ctype.h>
25
26 #include "sndfile.h"
27 #include "sfendian.h"
28 #include "common.h"
29
30 /*------------------------------------------------------------------------------
31 ** Macros to handle big/little endian issues.
32 */
33
34 #define PVF1_MARKER (MAKE_MARKER ('P', 'V', 'F', '1'))
35
36 /*------------------------------------------------------------------------------
37 ** Private static functions.
38 */
39
40 static int pvf_close (SF_PRIVATE *psf) ;
41
42 static int pvf_write_header (SF_PRIVATE *psf, int calc_length) ;
43 static int pvf_read_header (SF_PRIVATE *psf) ;
44
45 /*------------------------------------------------------------------------------
46 ** Public function.
47 */
48
49 int
50 pvf_open (SF_PRIVATE *psf)
51 { int subformat ;
52 int error = 0 ;
53
54 if (psf->file.mode == SFM_READ || (psf->file.mode == SFM_RDWR && psf->filelength > 0))
55 { if ((error = pvf_read_header (psf)))
56 return error ;
57 } ;
58
59 subformat = SF_CODEC (psf->sf.format) ;
60
61 if (psf->file.mode == SFM_WRITE || psf->file.mode == SFM_RDWR)
62 { if ((SF_CONTAINER (psf->sf.format)) != SF_FORMAT_PVF)
63 return SFE_BAD_OPEN_FORMAT ;
64
65 psf->endian = SF_ENDIAN_BIG ;
66
67 if (pvf_write_header (psf, SF_FALSE))
68 return psf->error ;
69
70 psf->write_header = pvf_write_header ;
71 } ;
72
73 psf->container_close = pvf_close ;
74
75 psf->blockwidth = psf->bytewidth * psf->sf.channels ;
76
77 switch (subformat)
78 { case SF_FORMAT_PCM_S8 : /* 8-bit linear PCM. */
79 case SF_FORMAT_PCM_16 : /* 16-bit linear PCM. */
80 case SF_FORMAT_PCM_32 : /* 32-bit linear PCM. */
81 error = pcm_init (psf) ;
82 break ;
83
84 default : break ;
85 } ;
86
87 return error ;
88 } /* pvf_open */
89
90 /*------------------------------------------------------------------------------
91 */
92
93 static int
94 pvf_close (SF_PRIVATE * UNUSED (psf))
95 {
96 return 0 ;
97 } /* pvf_close */
98
99 static int
100 pvf_write_header (SF_PRIVATE *psf, int UNUSED (calc_length))
101 { sf_count_t current ;
102
103 if (psf->pipeoffset > 0)
104 return 0 ;
105
106 current = psf_ftell (psf) ;
107
108 /* Reset the current header length to zero. */
109 psf->header [0] = 0 ;
110 psf->headindex = 0 ;
111
112 if (psf->is_pipe == SF_FALSE)
113 psf_fseek (psf, 0, SEEK_SET) ;
114
115 snprintf ((char*) psf->header, sizeof (psf->header), "PVF1\n%d %d %d\n",
116 psf->sf.channels, psf->sf.samplerate, psf->bytewidth * 8) ;
117
118 psf->headindex = strlen ((char*) psf->header) ;
119
120 /* Header construction complete so write it out. */
121 psf_fwrite (psf->header, psf->headindex, 1, psf) ;
122
123 if (psf->error)
124 return psf->error ;
125
126 psf->dataoffset = psf->headindex ;
127
128 if (current > 0)
129 psf_fseek (psf, current, SEEK_SET) ;
130
131 return psf->error ;
132 } /* pvf_write_header */
133
134 static int
135 pvf_read_header (SF_PRIVATE *psf)
136 { char buffer [32] ;
137 int marker, channels, samplerate, bitwidth ;
138
139 psf_binheader_readf (psf, "pmj", 0, &marker, 1) ;
140 psf_log_printf (psf, "%M\n", marker) ;
141
142 if (marker != PVF1_MARKER)
143 return SFE_PVF_NO_PVF1 ;
144
145 /* Grab characters up until a newline which is replaced by an EOS. */
146 psf_binheader_readf (psf, "G", buffer, sizeof (buffer)) ;
147
148 if (sscanf (buffer, "%d %d %d", &channels, &samplerate, &bitwidth) != 3)
149 return SFE_PVF_BAD_HEADER ;
150
151 psf_log_printf (psf, " Channels : %d\n Sample rate : %d\n Bit width : %d\n",
152 channels, samplerate, bitwidth) ;
153
154 psf->sf.channels = channels ;
155 psf->sf.samplerate = samplerate ;
156
157 switch (bitwidth)
158 { case 8 :
159 psf->sf.format = SF_FORMAT_PVF | SF_FORMAT_PCM_S8 ;
160 psf->bytewidth = 1 ;
161 break ;
162
163 case 16 :
164 psf->sf.format = SF_FORMAT_PVF | SF_FORMAT_PCM_16 ;
165 psf->bytewidth = 2 ;
166 break ;
167 case 32 :
168 psf->sf.format = SF_FORMAT_PVF | SF_FORMAT_PCM_32 ;
169 psf->bytewidth = 4 ;
170 break ;
171
172 default :
173 return SFE_PVF_BAD_BITWIDTH ;
174 } ;
175
176 psf->dataoffset = psf_ftell (psf) ;
177 psf_log_printf (psf, " Data Offset : %D\n", psf->dataoffset) ;
178
179 psf->endian = SF_ENDIAN_BIG ;
180
181 psf->datalength = psf->filelength - psf->dataoffset ;
182 psf->blockwidth = psf->sf.channels * psf->bytewidth ;
183
184 if (! psf->sf.frames && psf->blockwidth)
185 psf->sf.frames = (psf->filelength - psf->dataoffset) / psf->blockwidth ;
186
187 return 0 ;
188 } /* pvf_read_header */