ref: a30de9ea3744f99cbc73148ea98dbcd4f048ff6f
dir: /src/sf.c/
/* libSoX file format: IRCAM SoundFile (c) 2008 robs@users.sourceforge.net
*
* See http://www-mmsp.ece.mcgill.ca/Documents/AudioFormats/IRCAM/IRCAM.html
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at
* your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
* General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "sox_i.h"
#include <string.h>
/* Magic numbers used in IRCAM audio files */
static struct {char str[4]; sox_bool reverse_bytes; char const * desc;} id[] = {
{"\144\243\001\0", MACHINE_IS_BIGENDIAN , "little-endian VAX (native)"},
{"\0\001\243\144", MACHINE_IS_LITTLEENDIAN, "big-endian VAX"},
{"\144\243\002\0", MACHINE_IS_LITTLEENDIAN, "big-endian Sun (native)"},
{"\0\002\243\144", MACHINE_IS_BIGENDIAN , "little-endian Sun"},
{"\144\243\003\0", MACHINE_IS_BIGENDIAN , "little-endian MIPS (DEC)"},
{"\0\003\243\144", MACHINE_IS_LITTLEENDIAN, "big-endian MIPS (SGI)"},
{"\144\243\004\0", MACHINE_IS_LITTLEENDIAN, "big-endian NeXT"},
{" ", 0, NULL}
};
#define FIXED_HDR 1024
#define SF_COMMENT 2 /* code for "comment line" */
typedef enum {Unspecified,
Linear_8 = 0x00001, Alaw_8 = 0x10001, Mulaw_8 = 0x20001, Linear_16 = 0x00002,
Linear_24 = 0x00003, Linear_32 = 0x40004, Float = 0x00004, Double = 0x00008
} ft_encoding_t;
static ft_encoding_t ft_enc(unsigned size, sox_encoding_t encoding)
{
if (encoding == SOX_ENCODING_ULAW && size == 8) return Mulaw_8;
if (encoding == SOX_ENCODING_ALAW && size == 8) return Alaw_8;
if (encoding == SOX_ENCODING_SIGN2 && size == 8) return Linear_8;
if (encoding == SOX_ENCODING_SIGN2 && size == 16) return Linear_16;
if (encoding == SOX_ENCODING_SIGN2 && size == 24) return Linear_24;
if (encoding == SOX_ENCODING_SIGN2 && size == 32) return Linear_32;
if (encoding == SOX_ENCODING_FLOAT && size == 32) return Float;
if (encoding == SOX_ENCODING_FLOAT && size == 64) return Double;
return Unspecified;
}
static sox_encoding_t sox_enc(uint32_t ft_encoding, unsigned * size)
{
switch (ft_encoding) {
case Mulaw_8 : *size = 8; return SOX_ENCODING_ULAW;
case Alaw_8 : *size = 8; return SOX_ENCODING_ALAW;
case Linear_8 : *size = 8; return SOX_ENCODING_SIGN2;
case Linear_16 : *size = 16; return SOX_ENCODING_SIGN2;
case Linear_24 : *size = 24; return SOX_ENCODING_SIGN2;
case Linear_32 : *size = 32; return SOX_ENCODING_SIGN2;
case Float : *size = 32; return SOX_ENCODING_FLOAT;
case Double : *size = 64; return SOX_ENCODING_FLOAT;
default: return SOX_ENCODING_UNKNOWN;
}
}
static int startread(sox_format_t * ft)
{
char magic[4];
float rate;
uint32_t channels, ft_encoding;
unsigned i, bits_per_sample;
sox_encoding_t encoding;
uint16_t code, size;
if (lsx_readchars(ft, magic, sizeof(magic)))
return SOX_EOF;
for (i = 0; id[i].desc && memcmp(magic, id[i].str, sizeof(magic)); ++i);
if (!id[i].desc) {
lsx_fail_errno(ft, SOX_EHDR, "sf: can't find IRCAM identifier");
return SOX_EOF;
}
lsx_report("found %s identifier", id[i].desc);
ft->encoding.reverse_bytes = id[i].reverse_bytes;
if (lsx_readf(ft, &rate) || lsx_readdw(ft, &channels) || lsx_readdw(ft, &ft_encoding))
return SOX_EOF;
if (!(encoding = sox_enc(ft_encoding, &bits_per_sample))) {
lsx_fail_errno(ft, SOX_EFMT, "sf: unsupported encoding %#x)", ft_encoding);
return SOX_EOF;
}
do {
if (lsx_readw(ft, &code) || lsx_readw(ft, &size))
return SOX_EOF;
if (code == SF_COMMENT) {
char * buf = lsx_calloc(1, (size_t)size + 1); /* +1 ensures null-terminated */
if (lsx_readchars(ft, buf, (size_t) size) != SOX_SUCCESS) {
free(buf);
return SOX_EOF;
}
sox_append_comments(&ft->oob.comments, buf);
free(buf);
}
else if (lsx_skipbytes(ft, (size_t) size))
return SOX_EOF;
} while (code);
if (lsx_skipbytes(ft, FIXED_HDR - (size_t)lsx_tell(ft)))
return SOX_EOF;
return lsx_check_read_params(ft, channels, rate, encoding, bits_per_sample, (off_t)0, sox_true);
}
static int write_header(sox_format_t * ft)
{
char * comment = lsx_cat_comments(ft->oob.comments);
size_t len = min(FIXED_HDR - 26, strlen(comment)) + 1; /* null-terminated */
size_t info_len = max(4, (len + 3) & ~3u); /* Minimum & multiple of 4 bytes */
int i = ft->encoding.reverse_bytes == MACHINE_IS_BIGENDIAN? 0 : 2;
sox_bool error = sox_false
||lsx_writechars(ft, id[i].str, sizeof(id[i].str))
||lsx_writef(ft, ft->signal.rate)
||lsx_writedw(ft, ft->signal.channels)
||lsx_writedw(ft, ft_enc(ft->encoding.bits_per_sample, ft->encoding.encoding))
||lsx_writew(ft, SF_COMMENT)
||lsx_writew(ft, (unsigned) info_len)
||lsx_writechars(ft, comment, len)
||lsx_padbytes(ft, FIXED_HDR - 20 - len);
free(comment);
return error? SOX_EOF: SOX_SUCCESS;
}
LSX_FORMAT_HANDLER(sf)
{
static char const * const names[] = {"sf", "ircam", NULL};
static unsigned const write_encodings[] = {
SOX_ENCODING_ULAW, 8, 0,
SOX_ENCODING_ALAW, 8, 0,
SOX_ENCODING_SIGN2, 8, 16, 24, 32, 0,
SOX_ENCODING_FLOAT, 32, 64, 0,
0};
static sox_format_handler_t const handler = {SOX_LIB_VERSION_CODE,
"Institut de Recherche et Coordination Acoustique/Musique",
names, SOX_FILE_LIT_END,
startread, lsx_rawread, NULL,
write_header, lsx_rawwrite, NULL,
lsx_rawseek, write_encodings, NULL, 0
};
return &handler;
}