Hello!
I'm not quite shure, if this belongs here, or to the LAU list, but I am
subscribed here, so this is why I post it here. First, let me explain:
I'm in an urgent need for a notebook, as I am a university student
(from Slovakia) working as a part time PHP programmer and playing in a
(prog)rock band. I don't have much money I can spend on that book and I
need it now, so I am considering buying a refurbished IBM ThinkPad 600X
(PIII/450MHz, 128 or 256 MB RAM, 12 GB HDD). I'm not very demanding,
but I would be very glad, if I could use it for performing music on
stage. In the beginning maybe only playing a bit with PD and playing
samples and loops. I had an idea (this is why I'm writing) to buy later
a better desktop PC (with a good audio interface; maybe with a
rack-mount case) which would be running some audio apps (Jack,
softsynths, sequencer, ...) and could be controlled on stage via MIDI
and/or from the notebook using VNC (or NX) or MIDI. Or do you have any
suggestion, what could work better with lower latencies? Or is this
idea foolish as a whole?
I'm also interested if it is worth thinking about Linux HPC clustering
in a studio environment (Ardour with MPI?).
Thank you!
FerD
Hi!
The aim is to generate audiofile with one/few-sample-length impulse inside
silence. Is there suitable software to do the job?
Thanks in advance!
Andrew
Ok I apologize if this should go on the user list, wasnt really sure..
I am considering purchasing a PDA that will eventually have the express
purpose of recording 24/96 audio, and I was looking at picking up an
apogee Mini-me USB. I was wondering how uniform USB audio interfaces
were, and the likelihood the Apogee would actually work or not as it is
not listed at all in the Alsa wiki.
Seablade
I'm about to write a DSSI/LADSPA plugin that among other things, detunes
the signal by up to 15 cents. My understanding is that detuning is
accomplished by resampling. If that's the case, what do you do
with the time difference? Do you pad/truncate to get the same number of
samples you started out with? Wouldn't that introduce undesirables?
--
Hans Fugal ; http://hans.fugal.net
There's nothing remarkable about it. All one has to do is hit the
right keys at the right time and the instrument plays itself.
-- Johann Sebastian Bach
Another method, related to the vocoder but more "real-time" oriented
(i.e. sample-by-sample, not fft block processed) uses a bank of Hilbert
transforms (for the pitch shift) and a bank of bandpass filters (each
harmonic shifted individually to maintain harmonic relations) --
see ssb-bank et al in dsp.scm in the Snd tarball (ssb refers to the
single sideband suppressed carrier amplitude modulation generator).
sndscm.html has examples.
Hi guys
After reading the last few days postings, it is obvious that this list
is WAY OVER MY HEAD techwise. You are obviously developers!! Hence the
name of the mailing list. Sorry I missed that!
The thing is where can I get everyday info about triggering samples or
the program to use to do it etc.????
These type of questions are obviously beneath where your heads are
operating.
So, can someone humble themselves for a moment and give me some ideas
regarding the above forementioned??
Thaks in anticipation
Vaughan
Hello, I have created a patch that allows timeachine to automatically
start and stop recording based on the audio signal. Recording will start
when a sample value exceeds a start threashold. Recording stops when
sample values remain below a stop threashold for a period of time.
Recording of a new file will then start again when a sample value again
exceeds the start threashold. These values as well as enabeling auto
recording can all be set at the command line.
With this functionallity I would like to be able to launch timemachine
backgrounded.
Eg: timemachine args &
I would also need to be able to send the process SIGINT and SIGTERM
signals and have it exit gracefully. I have attempted to add the
necessary handlers for this.
However if I try to start timemachine backgrounded it just seems to exit
and brings jack down with it. If I run it in the foreground and try to
killall timemachine it does not exit gracefully but brings jack down as
well. In either case I see output from jack like:
subgraph starting at time timed out (subgraph_wait_fd = 7, status = 0,
state = Triggered)
jackd watchdog: timeout - killed jack
[1]+ Killed timemachine
Any suggestions or ideas are greatly appreciated. Also, the auto
recorder functionallity works great asside from the backgrounding and
SIGTERM business.
Thanks!
-Garett
PATCH FOLLOWS
diff -urN timemachine-0.3.1/src/main.c
timemachine-0.3.1.autorecord/src/main.c
--- timemachine-0.3.1/src/main.c 2005-09-19 03:41:30.000000000 -0600
+++ timemachine-0.3.1.autorecord/src/main.c 2006-01-14
11:24:13.000000000 -0700
@@ -28,6 +28,10 @@
#include <sndfile.h>
#include <gtk/gtk.h>
+/* garetts mod here */
+#include <signal.h>
+/* end garetts mod */
+
#ifdef HAVE_LASH
#include <lash/lash.h>
@@ -71,6 +75,10 @@
GdkPixbuf *img_on, *img_off, *img_busy;
GdkPixbuf *icon_on, *icon_off;
+/* garetts mod here */
+void signal_handler(int signal);
+/* end garetts mod */
+
int main(int argc, char *argv[])
{
unsigned int i;
@@ -78,13 +86,22 @@
int help = 0;
int console = 0;
char port_name[32];
+ /* garetts mod here */
+ int AUTO_RECORD = 0;
+ signal(SIGINT, signal_handler);
+ signal(SIGTERM, signal_handler);
+ float SECONDS_OF_SILENCE_BEFORE_STOP = 5;
+ float START_THREASHOLD = 0.000005;
+ float STOP_THREASHOLD = 0;
+ /* end garetts mod */
+
pthread_t dt;
#ifdef HAVE_LASH
lash_args_t *lash_args = lash_extract_args(&argc, &argv);
lash_event_t *event;
#endif
- while ((opt = getopt(argc, argv, "hic:t:n:p:f:")) != -1) {
+ while ((opt = getopt(argc, argv, "hic:t:n:p:f:q:w:e:r")) != -1) {
switch (opt) {
case 'h':
help = 1;
@@ -111,6 +128,20 @@
case 'f':
format_name = optarg;
break;
+ /* garetts mod here */
+ case 'q':
+ SECONDS_OF_SILENCE_BEFORE_STOP = atof(optarg);
+ break;
+ case 'w':
+ START_THREASHOLD = atof(optarg);
+ break;
+ case 'e':
+ STOP_THREASHOLD = atof(optarg);
+ break;
+ case 'r':
+ AUTO_RECORD = 1;
+ break;
+ /* end garetts mod */
default:
num_ports = 0;
break;
@@ -132,6 +163,9 @@
fprintf(stderr, "\t-t\tspecify the pre-recording buffer length\n");
fprintf(stderr, "\t-p\tspecify the saved file prefix, may include
path\n");
fprintf(stderr, "\t-f\tspecify the saved file format\n");
+ fprintf(stderr, "\t-q\tspecify the seconds of silence before stop\n");
+ fprintf(stderr, "\t-w\tspecify the start threashold\n");
+ fprintf(stderr, "\t-e\tspecify the stop threashold\n");
fprintf(stderr, "\n");
fprintf(stderr, "\tchannels must be in the range 1-8, default %d\n",
DEFAULT_NUM_PORTS);
@@ -164,7 +198,10 @@
}
DEBUG(1, "registering as %s\n", client_name);
- process_init(buf_length);
+ /* garetts mod here
+ * process_init(buf_length)
+ */
+ process_init(buf_length, SECONDS_OF_SILENCE_BEFORE_STOP,
START_THREASHOLD, STOP_THREASHOLD, AUTO_RECORD);
#ifdef HAVE_LASH
lash_client = lash_init (lash_args, "TimeMachine",
@@ -287,6 +324,11 @@
exit(0);
}
+void signal_handler(int iSignal) {
+ recording_stop();
+ cleanup();
+}
+
#ifdef HAVE_LASH
gboolean idle_cb(gpointer data)
{
diff -urN timemachine-0.3.1/src/threads.c
timemachine-0.3.1.autorecord/src/threads.c
--- timemachine-0.3.1/src/threads.c 2005-07-18 08:03:06.000000000 -0600
+++ timemachine-0.3.1.autorecord/src/threads.c 2006-01-14
10:58:18.000000000 -0700
@@ -19,7 +19,7 @@
#include <string.h>
#include <stdio.h>
#include <unistd.h>
-#include <time.h>
+#include <sys/time.h>
#include <sndfile.h>
#include <jack/jack.h>
#include <gtk/gtk.h>
@@ -46,6 +46,15 @@
static unsigned int disk_read_pos = 0;
static unsigned int disk_write_pos = 0;
+/* garetts mod here */
+static float seconds_of_silence_before_stop = 0;
+static float start_threashold = 0;
+static float stop_threashold = 0;
+static float seconds_of_silence = 0;
+static int sample_rate = 0;
+static int autorecord = 0;
+/* end garetts mod */
+
/* Peak data for meters */
static volatile float peak[MAX_PORTS];
@@ -69,6 +78,32 @@
fprintf(stderr, "bad buffer!\n");
break;
}
+
+ /* garetts mod here */
+ if (autorecord) {
+ if (rec) {
+ for (i = 0; i < nframes; i++) {
+ if (fabsf(in[i]) <= stop_threashold) {
+ seconds_of_silence = seconds_of_silence + 1.0/sample_rate;
+ }
+ else {
+ seconds_of_silence = 0;
+ }
+ if (seconds_of_silence > seconds_of_silence_before_stop) {
+ recording_stop();
+ }
+ }
+ }
+ else {
+ for (i = 0; i < nframes; i++) {
+ if (fabsf(in[i]) > start_threashold) {
+ recording_start();
+ break;
+ }
+ }
+ }
+ }
+ /* end garetts mod */
for (i = 0; i < nframes; i++) {
if (fabsf(in[i]) > peak[port]) {
@@ -202,7 +236,10 @@
return 0;
}
-void process_init(unsigned int time)
+/* garetts mod here
+ * void process_init(unsigned int time)
+ */
+void process_init(unsigned int time, float secs_of_silence_before_stop,
float strt_threashold, float stp_threashold, int use_autorecord)
{
unsigned int port;
@@ -220,6 +257,14 @@
pre_size = time * jack_get_sample_rate(client);
pre_time = time;
+ /* garetts mod here */
+ seconds_of_silence_before_stop = secs_of_silence_before_stop;
+ start_threashold = strt_threashold;
+ stop_threashold = stp_threashold;
+ sample_rate = jack_get_sample_rate(client);
+ autorecord = use_autorecord;
+ /* end garetts mod */
+
for (port = 0; port < num_ports; port++) {
pre_buffer[port] = calloc(pre_size, sizeof(float));
disk_buffer[port] = calloc(DISK_SIZE, sizeof(float));
diff -urN timemachine-0.3.1/src/threads.h
timemachine-0.3.1.autorecord/src/threads.h
--- timemachine-0.3.1/src/threads.h 2005-07-18 08:03:06.000000000 -0600
+++ timemachine-0.3.1.autorecord/src/threads.h 2006-01-14
10:56:37.000000000 -0700
@@ -9,7 +9,10 @@
int process(jack_nframes_t nframes, void *arg);
-void process_init(unsigned int time);
+/* garetts mod here
+ * void process_init(unsigned int time)
+ */
+void process_init(unsigned int time, float secs_of_silence_before_stop,
float strt_threashold, float stp_threashold, int use_autorecord);
int writer_thread(void *d);
Arrrgh!!
Thanks Clemens and anyone else that I may have missed, but thankfully I
have it going!!!!
After sending the last post and walking away for a cuppa I decided to
double check some keyboard settings. One of the keyboards panel lights
are out and therefore are pretty dim.
But no matter what excuse I use I feel pretty dumb and lame having to
admit that I overlooked a simple keyboard setting. I wrestled with this
thing for 12 hrs and I simply had a setting on my keyboard incorrectly
set.
Thanks anyway!
Vaughan
PS. Is there any site where Linux users are posting songs or samples of
their songs that they are producing with Linux???? If so where?
Hi this is my first post here and I'm hoping you are friendly and
understanding to a relative self learner of Linux!! I am a musician
first and a computer hacker second. I have learned everyting I know
about Linux by stuffing up my computer and learning to refix it via the
net and forums such as this one.
I have installed Fedora Core 3 and added the ccrma kernels and programs
via the how to files on the net. I am SO IMPRESSED with the system that
they present.
I have so far achieved getting everything running (except midi...more on
that in a second) I have even been able to run some VST plugins and
programs via FST.
I am 3/4 of the way through a song on Ardour and am loving what I am
hearing so far and want to continue using Linux as my main form of
recording.
I have a Hoontech C-Port soundcard succesfully using the ice1712 driver.
However "midi in" on this card doesn't work with Alsa.
So, I just got a yamaha usb "UX16" midi controller so I can trigger some
samples. Here is my problem.
The Ux16 shows up in the qjackctrl midi connections gui. BUT nothing
appears to be triggered by my exterior keyboard.
I have tried everything in my brain but I have finally had to admit
defeat.
Oh yea I am running the 2.6.11-0.3.rdt.rhfc3.ccrma kernel
If anyone can help I'd be much obliged. Thanks in advance.
Vaughan
