ref: 65875a6263ba836452ec8a658903525ecdfa12ee
dir: /src/stio.c/
#include "st_i.h"
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/types.h> /* for fstat() */
#include <sys/stat.h> /* for fstat() */
#ifdef _MSC_VER
/* __STDC__ is defined, so these symbols aren't created. */
#define S_IFMT _S_IFMT
#define S_IFREG _S_IFREG
#define fstat _fstat
#endif
/* Based on zlib's minigzip: */
#if defined(WIN32) || defined(__NT__)
#include <fcntl.h>
#include <io.h>
#ifndef O_BINARY
#define O_BINARY _O_BINARY
#endif
#define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
#else
#define SET_BINARY_MODE(file)
#endif
void set_endianness_if_not_already_set(ft_t ft)
{
if (ft->signal.reverse_bytes == ST_OPTION_DEFAULT) {
if (ft->h->flags & ST_FILE_ENDIAN)
ft->signal.reverse_bytes = ST_IS_LITTLEENDIAN != !(ft->h->flags & ST_FILE_ENDBIG);
else
ft->signal.reverse_bytes = ST_OPTION_NO;
}
if (ft->signal.reverse_nibbles == ST_OPTION_DEFAULT)
ft->signal.reverse_nibbles = ST_OPTION_NO;
if (ft->signal.reverse_bits == ST_OPTION_DEFAULT)
ft->signal.reverse_bits = ST_OPTION_NO;
}
static int is_seekable(ft_t ft)
{
struct stat st;
fstat(fileno(ft->fp), &st);
return ((st.st_mode & S_IFMT) == S_IFREG);
}
/* check that all settings have been given */
static int st_checkformat(ft_t ft)
{
ft->st_errno = ST_SUCCESS;
if (ft->signal.rate == 0)
{
st_fail_errno(ft,ST_EFMT,"sampling rate was not specified");
return ST_EOF;
}
if (ft->signal.size == -1)
{
st_fail_errno(ft,ST_EFMT,"data size was not specified");
return ST_EOF;
}
if (ft->signal.encoding == ST_ENCODING_UNKNOWN)
{
st_fail_errno(ft,ST_EFMT,"data encoding was not specified");
return ST_EOF;
}
if ((ft->signal.size <= 0) || (ft->signal.size > ST_INFO_SIZE_MAX))
{
st_fail_errno(ft,ST_EFMT,"data size %i is invalid");
return ST_EOF;
}
if (ft->signal.encoding <= 0 || ft->signal.encoding >= ST_ENCODINGS)
{
st_fail_errno(ft,ST_EFMT,"data encoding %i is invalid");
return ST_EOF;
}
return ST_SUCCESS;
}
ft_t st_open_read(const char *path, const st_signalinfo_t *info,
const char *filetype)
{
ft_t ft = (ft_t)xcalloc(sizeof(struct st_soundstream), 1);
ft->filename = xstrdup(path);
/* Let auto type do the work if user is not overriding. */
if (!filetype)
ft->filetype = xstrdup("auto");
else
ft->filetype = xstrdup(filetype);
if (st_gettype(ft, st_false) != ST_SUCCESS) {
st_warn("Unknown input file format for `%s': %s",
ft->filename,
ft->st_errstr);
goto input_error;
}
ft->signal.size = -1;
ft->signal.encoding = ST_ENCODING_UNKNOWN;
ft->signal.channels = 0;
if (info)
ft->signal = *info;
ft->mode = 'r';
if (!(ft->h->flags & ST_FILE_NOSTDIO))
{
/* Open file handler based on input name. Used stdin file handler
* if the filename is "-"
*/
if (!strcmp(ft->filename, "-"))
{
SET_BINARY_MODE(stdin);
ft->fp = stdin;
}
else if ((ft->fp = fopen(ft->filename, "rb")) == NULL)
{
st_warn("Can't open input file `%s': %s", ft->filename,
strerror(errno));
goto input_error;
}
/* See if this file is seekable or not */
ft->seekable = is_seekable(ft);
}
if (filetype)
set_endianness_if_not_already_set(ft);
/* Read and write starters can change their formats. */
if ((*ft->h->startread)(ft) != ST_SUCCESS)
{
st_warn("Failed reading `%s': %s", ft->filename, ft->st_errstr);
goto input_error;
}
/* Go a head and assume 1 channel audio if nothing is detected.
* This is because libst usually doesn't set this for mono file
* formats (for historical reasons).
*/
if (ft->signal.channels == 0)
ft->signal.channels = 1;
if (st_checkformat(ft) )
{
st_warn("bad input format for file %s: %s", ft->filename,
ft->st_errstr);
goto input_error;
}
return ft;
input_error:
free(ft->filename);
free(ft->filetype);
free(ft);
return NULL;
}
#if defined(DOS) || defined(WIN32)
#define LASTCHAR '\\'
#else
#define LASTCHAR '/'
#endif
ft_t st_open_write(
st_bool (*overwrite_permitted)(const char *filename),
const char *path,
const st_signalinfo_t *info,
const char *filetype,
const char *comment,
const st_instrinfo_t *instr,
const st_loopinfo_t *loops)
{
ft_t ft = (ft_t)xcalloc(sizeof(struct st_soundstream), 1);
int i;
st_bool no_filetype_given = filetype == NULL;
ft->filename = xstrdup(path);
/* Let auto effect do the work if user is not overriding. */
if (!filetype) {
char *chop;
int len;
len = strlen(ft->filename);
/* Use filename extension to determine audio type.
* Search for the last '.' appearing in the filename, same
* as for input files.
*/
chop = ft->filename + len;
while (chop > ft->filename && *chop != LASTCHAR && *chop != '.')
chop--;
if (*chop == '.') {
chop++;
ft->filetype = xstrdup(chop);
}
} else
ft->filetype = xstrdup(filetype);
if (!ft->filetype || st_gettype(ft, no_filetype_given) != ST_SUCCESS)
{
st_fail("Unknown output file format for '%s': %s",
ft->filename,
ft->st_errstr);
goto output_error;
}
ft->signal.size = -1;
ft->signal.encoding = ST_ENCODING_UNKNOWN;
ft->signal.channels = 0;
if (info)
ft->signal = *info;
ft->mode = 'w';
if (!(ft->h->flags & ST_FILE_NOSTDIO))
{
/* Open file handler based on output name. Used stdout file handler
* if the filename is "-"
*/
if (!strcmp(ft->filename, "-"))
{
SET_BINARY_MODE(stdout);
ft->fp = stdout;
}
else {
struct stat st;
if (!stat(ft->filename, &st) && (st.st_mode & S_IFMT) == S_IFREG &&
!overwrite_permitted(ft->filename)) {
st_fail("Permission to overwrite '%s' denied", ft->filename);
goto output_error;
}
if ((ft->fp = fopen(ft->filename, "wb")) == NULL) {
st_fail("Can't open output file '%s': %s", ft->filename,
strerror(errno));
goto output_error;
}
}
/* stdout tends to be line-buffered. Override this */
/* to be Full Buffering. */
if (setvbuf (ft->fp, NULL, _IOFBF, sizeof(char)*ST_BUFSIZ))
{
st_fail("Can't set write buffer");
goto output_error;
}
/* See if this file is seekable or not */
ft->seekable = is_seekable(ft);
}
ft->comment = xstrdup(comment);
if (loops)
for (i = 0; i < ST_MAX_NLOOPS; i++)
ft->loops[i] = loops[i];
/* leave SMPTE # alone since it's absolute */
if (instr)
ft->instr = *instr;
set_endianness_if_not_already_set(ft);
/* Read and write starters can change their formats. */
if ((*ft->h->startwrite)(ft) != ST_SUCCESS)
{
st_fail("Failed writing %s: %s", ft->filename, ft->st_errstr);
goto output_error;
}
if (st_checkformat(ft) )
{
st_fail("bad output format for file %s: %s", ft->filename,
ft->st_errstr);
goto output_error;
}
return ft;
output_error:
free(ft->filename);
free(ft->filetype);
free(ft);
return NULL;
}
st_size_t st_read(ft_t ft, st_sample_t *buf, st_size_t len)
{
len -= len % ft->signal.channels; /* We need a whole number of "wide" samples */
len = (*ft->h->read)(ft, buf, len);
if (len != 0)
len -= len % ft->signal.channels; /* Belt & braces */
return len;
}
st_size_t st_write(ft_t ft, const st_sample_t *buf, st_size_t len)
{
return (*ft->h->write)(ft, buf, len);
}
/* N.B. The file (if any) may already have been deleted. */
int st_close(ft_t ft)
{
int rc;
if (ft->mode == 'r')
rc = (*ft->h->stopread)(ft);
else
rc = (*ft->h->stopwrite)(ft);
if (!(ft->h->flags & ST_FILE_NOSTDIO))
fclose(ft->fp);
free(ft->filename);
free(ft->filetype);
/* Currently, since startread() mallocs comments, stopread
* is expected to also free it. */
if (ft->mode == 'w')
free(ft->comment);
return rc;
}