ref: 2bd6911168b9440b9c4ead117a63220a53009bbb
dir: /src/auto.c/
/*
* May 19, 1992
* Copyright 1992 Guido van Rossum And Sundry Contributors
* This source code is freely redistributable and may be used for
* any purpose. This copyright notice must be maintained.
* Guido van Rossum And Sundry Contributors are not responsible for
* the consequences of using this software.
*/
/*
* A meta-handler that recognizes most file types by looking in the
* first part of the file. The file must be seekable!
* (IRCAM sound files are not recognized -- these don't seem to be
* used any more -- but this is just laziness on my part.)
*/
#include "st.h"
#include <string.h>
int st_autostartread(ft)
ft_t ft;
{
char *type;
char header[132];
if (!ft->seekable)
{
fail("Type AUTO input must be a file, not a pipe");
return(ST_EOF);
}
if (fread(header, 1, sizeof(header), ft->fp) != sizeof(header))
{
fail("Type AUTO detects short file");
return(ST_EOF);
}
fseek(ft->fp, 0L - sizeof header, 1); /* Seek back */
type = 0;
if ((strncmp(header, ".snd", 4) == 0) ||
(strncmp(header, "dns.", 4) == 0) ||
((header[0] == '\0') && (strncmp(header+1, "ds.", 3) == 0))) {
type = "au";
}
else if (strncmp(header, "FORM", 4) == 0) {
if (strncmp(header + 8, "AIFF", 4) == 0)
type = "aiff";
else if (strncmp(header + 8, "8SVX", 4) == 0)
type = "8svx";
else if (strncmp(header + 8, "MAUD", 4) == 0)
type = "maud";
}
else if (strncmp(header, "RIFF", 4) == 0 &&
strncmp(header + 8, "WAVE", 4) == 0) {
type = "wav";
}
else if (strncmp(header, "Creative Voice File", 19) == 0) {
type = "voc";
}
else if (strncmp(header+65, "FSSD", 4) == 0 &&
strncmp(header+128, "HCOM", 4) == 0) {
type = "hcom";
}
else if (strncmp(header, "SOUND", 5) == 0) {
type = "sndt";
}
else if (strncmp(header, "2BIT", 4) == 0) {
type = "avr";
}
else if (header[0] == 0 && header[1] == 0) {
int rate = (header[2] & 0xff) + ((header[3] & 0xff) << 8);
if (rate >= 4000 && rate <= 25000)
type = "sndr";
}
if (type == 0) {
printf("Type AUTO doesn't recognize this header\n");
printf("Trying: -t raw -r 11000 -b -u\n\n");
type = "raw";
ft->info.rate = 11000;
ft->info.size = ST_SIZE_BYTE;
ft->info.encoding = ST_ENCODING_UNSIGNED;
}
report("Type AUTO changed to %s", type);
ft->filetype = type;
st_gettype(ft); /* Change ft->h to the new format */
(* ft->h->startread)(ft);
return(ST_SUCCESS);
}
int st_autostartwrite(ft)
ft_t ft;
{
fail("Type AUTO can only be used for input!");
return(ST_EOF);
}