1 /*
2 ** Copyright (C) 2004-2017 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 <string.h>
23
24 #include "sndfile.h"
25 #include "sfendian.h"
26 #include "common.h"
27
28 #define TWOBIT_MARKER (MAKE_MARKER ('2', 'B', 'I', 'T'))
29 #define AVR_HDR_SIZE 128
30
31 /*
32 ** From: hyc@hanauma.Jpl.Nasa.Gov (Howard Chu)
33 **
34 ** A lot of PD software exists to play Mac .snd files on the ST. One other
35 ** format that seems pretty popular (used by a number of commercial packages)
36 ** is the AVR format (from Audio Visual Research). This format has a 128 byte
37 ** header that looks like this (its actually packed, but thats not portable):
38 */
39
40 typedef struct
41 { int marker ; /* 2BIT */
42 char name [8] ; /* null-padded sample name */
43 short mono ; /* 0 = mono, 0xffff = stereo */
44 short rez ; /* 8 = 8 bit, 16 = 16 bit */
45 short sign ; /* 0 = unsigned, 0xffff = signed */
46
47 short loop ; /* 0 = no loop, 0xffff = looping sample */
48 short midi ; /* 0xffff = no MIDI note assigned, */
49 /* 0xffXX = single key note assignment */
50 /* 0xLLHH = key split, low/hi note */
51 int srate ; /* sample frequency in hertz */
52 int frames ; /* sample length in bytes or words (see rez) */
53 int lbeg ; /* offset to start of loop in bytes or words. */
54 /* set to zero if unused */
55 int lend ; /* offset to end of loop in bytes or words. */
56 /* set to sample length if unused */
57 short res1 ; /* Reserved, MIDI keyboard split */
58 short res2 ; /* Reserved, sample compression */
59 short res3 ; /* Reserved */
60 char ext [20] ; /* Additional filename space, used if (name[7] != 0) */
61 char user [64] ; /* User defined. Typically ASCII message */
62 } AVR_HEADER ;
63
64 /*------------------------------------------------------------------------------
65 ** Private static functions.
66 */
67
68 static int avr_close (SF_PRIVATE *psf) ;
69
70 static int avr_read_header (SF_PRIVATE *psf) ;
71 static int avr_write_header (SF_PRIVATE *psf, int calc_length) ;
72
73 /*------------------------------------------------------------------------------
74 ** Public function.
75 */
76
77 int
avr_open(SF_PRIVATE * psf)78 avr_open (SF_PRIVATE *psf)
79 { int error = 0 ;
80
81 if (psf->file.mode == SFM_READ || (psf->file.mode == SFM_RDWR && psf->filelength > 0))
82 { if ((error = avr_read_header (psf)))
83 return error ;
84 } ;
85
86 if ((SF_CONTAINER (psf->sf.format)) != SF_FORMAT_AVR)
87 return SFE_BAD_OPEN_FORMAT ;
88
89 if (psf->file.mode == SFM_WRITE || psf->file.mode == SFM_RDWR)
90 { psf->endian = SF_ENDIAN_BIG ;
91
92 if (avr_write_header (psf, SF_FALSE))
93 return psf->error ;
94
95 psf->write_header = avr_write_header ;
96 } ;
97
98 psf->container_close = avr_close ;
99
100 psf->blockwidth = psf->bytewidth * psf->sf.channels ;
101
102 error = pcm_init (psf) ;
103
104 return error ;
105 } /* avr_open */
106
107 static int
avr_read_header(SF_PRIVATE * psf)108 avr_read_header (SF_PRIVATE *psf)
109 { AVR_HEADER hdr ;
110
111 memset (&hdr, 0, sizeof (hdr)) ;
112
113 psf_binheader_readf (psf, "pmb", 0, &hdr.marker, &hdr.name, sizeof (hdr.name)) ;
114 psf_log_printf (psf, "%M\n", hdr.marker) ;
115
116 if (hdr.marker != TWOBIT_MARKER)
117 return SFE_AVR_NOT_AVR ;
118
119 psf_log_printf (psf, " Name : %s\n", hdr.name) ;
120
121 psf_binheader_readf (psf, "E22222", &hdr.mono, &hdr.rez, &hdr.sign, &hdr.loop, &hdr.midi) ;
122
123 psf->sf.channels = (hdr.mono & 1) + 1 ;
124
125 psf_log_printf (psf, " Channels : %d\n Bit width : %d\n Signed : %s\n",
126 (hdr.mono & 1) + 1, hdr.rez, hdr.sign ? "yes" : "no") ;
127
128 switch (arith_shift_left (hdr.rez, 16) + (hdr.sign & 1))
129 { case ((8 << 16) + 0) :
130 psf->sf.format = SF_FORMAT_AVR | SF_FORMAT_PCM_U8 ;
131 psf->bytewidth = 1 ;
132 break ;
133
134 case ((8 << 16) + 1) :
135 psf->sf.format = SF_FORMAT_AVR | SF_FORMAT_PCM_S8 ;
136 psf->bytewidth = 1 ;
137 break ;
138
139 case ((16 << 16) + 1) :
140 psf->sf.format = SF_FORMAT_AVR | SF_FORMAT_PCM_16 ;
141 psf->bytewidth = 2 ;
142 break ;
143
144 default :
145 psf_log_printf (psf, "Error : bad rez/sign combination.\n") ;
146 return SFE_AVR_BAD_REZ_SIGN ;
147 } ;
148
149 psf_binheader_readf (psf, "E4444", &hdr.srate, &hdr.frames, &hdr.lbeg, &hdr.lend) ;
150
151 psf->sf.frames = hdr.frames ;
152 psf->sf.samplerate = hdr.srate ;
153
154 psf_log_printf (psf, " Frames : %D\n", psf->sf.frames) ;
155 psf_log_printf (psf, " Sample rate : %d\n", psf->sf.samplerate) ;
156
157 psf_binheader_readf (psf, "E222", &hdr.res1, &hdr.res2, &hdr.res3) ;
158 psf_binheader_readf (psf, "bb", hdr.ext, sizeof (hdr.ext), hdr.user, sizeof (hdr.user)) ;
159
160 psf_log_printf (psf, " Ext : %s\n User : %s\n", hdr.ext, hdr.user) ;
161
162 psf->endian = SF_ENDIAN_BIG ;
163
164 psf->dataoffset = AVR_HDR_SIZE ;
165 psf->datalength = hdr.frames * (hdr.rez / 8) ;
166
167 if (psf->fileoffset > 0)
168 psf->filelength = AVR_HDR_SIZE + psf->datalength ;
169
170 if (psf_ftell (psf) != psf->dataoffset)
171 psf_binheader_readf (psf, "j", psf->dataoffset - psf_ftell (psf)) ;
172
173 psf->blockwidth = psf->sf.channels * psf->bytewidth ;
174
175 if (psf->sf.frames == 0 && psf->blockwidth)
176 psf->sf.frames = (psf->filelength - psf->dataoffset) / psf->blockwidth ;
177
178 return 0 ;
179 } /* avr_read_header */
180
181 static int
avr_write_header(SF_PRIVATE * psf,int calc_length)182 avr_write_header (SF_PRIVATE *psf, int calc_length)
183 { sf_count_t current ;
184 int sign ;
185
186 if (psf->pipeoffset > 0)
187 return 0 ;
188
189 current = psf_ftell (psf) ;
190
191 if (calc_length)
192 { psf->filelength = psf_get_filelen (psf) ;
193
194 psf->datalength = psf->filelength - psf->dataoffset ;
195 if (psf->dataend)
196 psf->datalength -= psf->filelength - psf->dataend ;
197
198 psf->sf.frames = psf->datalength / (psf->bytewidth * psf->sf.channels) ;
199 } ;
200
201 /* Reset the current header length to zero. */
202 psf->header.ptr [0] = 0 ;
203 psf->header.indx = 0 ;
204
205 /*
206 ** Only attempt to seek if we are not writng to a pipe. If we are
207 ** writing to a pipe we shouldn't be here anyway.
208 */
209 if (psf->is_pipe == SF_FALSE)
210 psf_fseek (psf, 0, SEEK_SET) ;
211
212 psf_binheader_writef (psf, "Emz22", BHWm (TWOBIT_MARKER), BHWz (8),
213 BHW2 (psf->sf.channels == 2 ? 0xFFFF : 0), BHW2 (psf->bytewidth * 8)) ;
214
215 sign = ((SF_CODEC (psf->sf.format)) == SF_FORMAT_PCM_U8) ? 0 : 0xFFFF ;
216
217 psf_binheader_writef (psf, "E222", BHW2 (sign), BHW2 (0), BHW2 (0xFFFF)) ;
218 psf_binheader_writef (psf, "E4444", BHW4 (psf->sf.samplerate), BHW4 (psf->sf.frames), BHW4 (0), BHW4 (0)) ;
219
220 psf_binheader_writef (psf, "E222zz", BHW2 (0), BHW2 (0), BHW2 (0), BHWz (20), BHWz (64)) ;
221
222 /* Header construction complete so write it out. */
223 psf_fwrite (psf->header.ptr, psf->header.indx, 1, psf) ;
224
225 if (psf->error)
226 return psf->error ;
227
228 psf->dataoffset = psf->header.indx ;
229
230 if (current > 0)
231 psf_fseek (psf, current, SEEK_SET) ;
232
233 return psf->error ;
234 } /* avr_write_header */
235
236 static int
avr_close(SF_PRIVATE * psf)237 avr_close (SF_PRIVATE *psf)
238 {
239 if (psf->file.mode == SFM_WRITE || psf->file.mode == SFM_RDWR)
240 avr_write_header (psf, SF_TRUE) ;
241
242 return 0 ;
243 } /* avr_close */
244
245