aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat
-rw-r--r--miragextract.c104
1 files changed, 79 insertions, 25 deletions
diff --git a/miragextract.c b/miragextract.c
index 0eef029..e9d570d 100644
--- a/miragextract.c
+++ b/miragextract.c
@@ -3,6 +3,7 @@
#include <unistd.h>
#include <string.h>
#include <limits.h>
+#include <errno.h>
#include <sndfile.h>
#include <mirage/mirage.h>
@@ -14,8 +15,10 @@
/* This should be big enough to hold any CD sector */
#define BUF_SIZE 4096
+/* main() sets this to our executable name */
const char *self;
+/* command-line args/opts set these */
char *imagefile = NULL;
char *outfilebase = "track";
char *outfmt = "wav";
@@ -26,17 +29,35 @@ int autoname = 0;
int want_data = 1;
int want_audio = 1;
+/* CD image state */
MirageContext *mirage = NULL;
MirageDisc *disc = NULL;
MirageSession *session = NULL;
int output_track_number = 0;
int total_bytes = 0;
-void die(char *msg) {
+/* libmirage errors set this */
+GError *gerr = NULL;
+
+/* print executable name: error message, then exit with failure status. */
+void die(const char *msg) {
+ if(msg) {
+ /* do nothing, use msg as-is */
+ } else if(gerr && gerr->message) {
+ /* msg was NULL, if there's a libmirage error message, use it */
+ msg = gerr->message;
+ } else {
+ /* msg was NULL and there's nothing from libmirage, fallback: */
+ msg = strerror(errno);
+ }
fprintf(stderr, "%s: %s\n", self, msg);
exit(1);
}
+/* either swap bytes into a static buffer and return a pointer
+ to it, or don't swap bytes and return the original buffer.
+ Paranoia, because mirage_sector_get_data() returns a const
+ buffer (probably safe to cast away the const, but...) */
const guint8 *apply_s_opt(const guint8 *buf, gint len) {
int i;
static guint8 newbuf[BUF_SIZE];
@@ -51,22 +72,29 @@ const guint8 *apply_s_opt(const guint8 *buf, gint len) {
return (const guint8 *)newbuf;
}
-void print_progress(void) {
- static char spinner[] = "-/|\\";
+/* each call to spinner() prints the next character and a backspace */
+void spinner(void) {
+ static char spinchars[] = "-/|\\";
static int count = 0;
- putchar(spinner[count++]);
+
+ putchar(spinchars[count++]);
putchar('\b');
fflush(stdout);
+
if(count == 4) count = 0;
}
+/* format human-readable quantities (567.5MB is a lot easier to read
+ than 595024576). these are 2^10 byte megabytes, as the gods intended. */
char *human_mb(int bytes) {
static char buf[10];
sprintf(buf, "%2.1f", (float)bytes / 1048576.0);
return buf;
}
-void extract_track(int t, int extract) {
+/* list and (optionally) extract a track. this should be broken up into
+ smaller functions for clarity. */
+void process_track(int t, int extract) {
MirageTrack *track;
MirageSector *sector;
int sector_type, sec = 0;
@@ -81,31 +109,32 @@ void extract_track(int t, int extract) {
printf(" %d (-t %d): ", t + 1, output_track_number);
- if(!(track = mirage_session_get_track_by_index(session, t, NULL)))
- die("can't read track");
+ if(!(track = mirage_session_get_track_by_index(session, t, &gerr)))
+ die(NULL);
sector_type = mirage_track_get_sector_type(track);
switch(sector_type) {
case MIRAGE_SECTOR_MODE1:
case MIRAGE_SECTOR_MODE2_FORM1:
- printf("data, ");
+ printf("data: ");
ext = "iso";
if(!want_data) extract = 0;
break;
case MIRAGE_SECTOR_AUDIO:
- printf("audio, ");
+ printf("audio: ");
if(!want_audio) extract = 0;
ext = outfmt;
break;
default:
- printf("<unknown>, ");
+ printf("<unknown>: ");
ext = "raw";
if(!want_data) extract = 0;
break;
}
- sector = mirage_track_get_sector(track, 0, 0, NULL);
+ if(!(sector = mirage_track_get_sector(track, 0, 0, &gerr)))
+ die(NULL);
sprintf(outfile, "%s%02d.%s", outfilebase, output_track_number, ext);
@@ -124,10 +153,13 @@ void extract_track(int t, int extract) {
case 'w':
sfi.format = SF_FORMAT_WAV | SF_FORMAT_PCM_16;
break;
+ default:
+ /* this should never happen */
+ break;
}
if(!(sfout = sf_open(outfile, SFM_WRITE, &sfi)))
- die("can't open output audio file");
+ die(sf_strerror(sfout));
sf_command(sfout, SFC_SET_VBR_ENCODING_QUALITY, &quality, sizeof(double));
} else {
@@ -139,15 +171,19 @@ void extract_track(int t, int extract) {
sec = mirage_track_get_track_start(track);
while((sector = mirage_track_get_sector(track, sec++, 0, NULL))) {
- mirage_sector_get_data(sector, &buf, &len, NULL);
+ if(!(mirage_sector_get_data(sector, &buf, &len, &gerr)))
+ die(NULL);
bytes += len;
if(extract) {
if(sfout) {
- sf_write_short(sfout, (const short *)apply_s_opt(buf, len), len / 2);
+ int items = len / 2;
+ if(sf_write_short(sfout, (const short *)apply_s_opt(buf, len), items) != items)
+ die(sf_strerror(sfout));
} else {
- fwrite(buf, len, 1, out);
+ if(fwrite(buf, len, 1, out) != 1)
+ die(strerror(errno));
}
- if(isatty(1) && !(sec % 50)) print_progress();
+ if(isatty(1) && !(sec % 50)) spinner();
}
g_object_unref(sector);
}
@@ -162,6 +198,7 @@ void extract_track(int t, int extract) {
return;
}
+/* assign base filename (without extension), based on image filename */
void set_auto_name(void) {
static char autoname[PATH_MAX + 1];
char *p;
@@ -174,6 +211,17 @@ void set_auto_name(void) {
outfilebase = autoname;
}
+/* return true if outfmt is a supported output format */
+int outfmt_ok(char *outfmt) {
+ static const char *supported[] = { "cdda", "wav", "flac", "ogg", NULL };
+ const char **p;
+
+ for(p = supported; *p; p++)
+ if(strcmp(*p, outfmt) == 0) return 1;
+
+ return 0;
+}
+
void usage(void) {
char spaces[42];
int i, count;
@@ -193,6 +241,8 @@ void usage(void) {
exit(0);
}
+/* this should probably use something like getopts(), but I'm trying
+ to avoid GNU extensions. */
void parse_args(int argc, char **argv) {
if(argc == 1) usage();
if(argc > 1 && strcmp(argv[1], "--help") == 0) usage();
@@ -235,6 +285,8 @@ void parse_args(int argc, char **argv) {
if(nextarg) {
argv++, argc--;
outfmt = nextarg;
+ if(!outfmt_ok(outfmt))
+ die("unsupported output format for -f");
} else
die("-f option requires format argument");
break;
@@ -267,6 +319,8 @@ void parse_args(int argc, char **argv) {
if(autoname) set_auto_name();
}
+/* open the disc image, iterate over the tracks, calling
+ process_track() on each one. */
int main(int argc, char **argv) {
const char *p;
gchar *fn[2];
@@ -280,21 +334,21 @@ int main(int argc, char **argv) {
parse_args(argc, argv);
if(!((mirage = g_object_new(MIRAGE_TYPE_CONTEXT, NULL))))
- die("couldn't get mirage context");
+ die("can't get mirage context");
- if(!mirage_initialize(NULL))
- die("couldn't initialize libmirage");
+ if(!mirage_initialize(&gerr))
+ die(NULL);
/* TODO: find out what image formats require multiple filenames, if any */
- fn[0] = imagefile;
+ fn[0] = (gchar *)imagefile;
fn[1] = NULL;
- if(!(disc = mirage_context_load_image(mirage, fn, NULL)))
- die("couldn't load image");
+ if(!(disc = mirage_context_load_image(mirage, fn, &gerr)))
+ die(NULL);
for(s = 0; s < mirage_disc_get_number_of_sessions(disc); s++) {
- if(!(session = mirage_disc_get_session_by_index(disc, s, NULL)))
- die("couldn't read session");
+ if(!(session = mirage_disc_get_session_by_index(disc, s, &gerr)))
+ die(NULL);
printf("Session %d tracks:\n", s + 1);
@@ -305,7 +359,7 @@ int main(int argc, char **argv) {
if(want_track == 0 || want_track == output_track_number)
extract = 1;
- extract_track(t, extract);
+ process_track(t, extract);
}
if(!t) printf(" (no tracks in session)\n");
g_object_unref(session);
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-25 18:08:16 +0000