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 40typedef 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 68static int avr_close (SF_PRIVATE *psf) ; 69 70static int avr_read_header (SF_PRIVATE *psf) ; 71static int avr_write_header (SF_PRIVATE *psf, int calc_length) ; 72 73/*------------------------------------------------------------------------------ 74** Public function. 75*/ 76 77int 78avr_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 107static int 108avr_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 181static int 182avr_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 236static int 237avr_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