Commit 21dfcfe6 authored by sletz's avatar sletz
Browse files

Rename jdelay to jack_iodelay as per Fons' request.

git-svn-id: http://subversion.jackaudio.org/jack/jack2/trunk/jackmp@4163 0c269be4-1314-0410-8aa9-9f06e86f4224
parent 246b75a9
......@@ -41,6 +41,7 @@ Valerio Pilo
* Check requested buffer size and limit to 1..8192 - avoids wierd behaviour caused by jack_bufsize foobar.
* jack_port_type_get_buffer_size implementation.
* Stop using alloca and allocate buffer on the heap for alsa_io.
* Rename jdelay to jack_iodelay as per Fons' request.
2011-03-08 Stephane Letz <letz@grame.fr>
......
......@@ -291,7 +291,6 @@
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......@@ -318,6 +317,8 @@
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......@@ -839,7 +840,6 @@
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......@@ -1470,7 +1470,7 @@
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......@@ -1506,6 +1506,7 @@
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......@@ -1722,8 +1723,7 @@
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......@@ -2448,7 +2448,7 @@
4B699DB0097D421700A18468 /* jack_dummy.so */,
4B978DBB0A31CF4A009E2DD1 /* jack_portaudio.so */,
4BE6C6A30A3E096F005A203A /* jack_test */,
4BFA99A20AAAF3B0009E916C /* jdelay */,
4BFA99A20AAAF3B0009E916C /* jack_iodelay */,
4BE99D300AD7A04800C59091 /* jack_cpu */,
4BD623F70CBCF0F000DE782F /* inprocess.so */,
4BA692B00CBE4BC700EAD520 /* jack_load */,
......@@ -2465,7 +2465,7 @@
4B35C5440D4731D1000DE7AE /* jack_connect */,
4B35C5500D4731D1000DE7AE /* jack_disconnect */,
4B35C55E0D4731D2000DE7AE /* jack_freewheel */,
4B35C56A0D4731D2000DE7AE /* jdelay */,
4B35C56A0D4731D2000DE7AE /* jack_iodelay */,
4B35C5760D4731D2000DE7AE /* jack_external_metro */,
4B35C5860D4731D2000DE7AE /* testAtomic */,
4B35C59A0D4731D2000DE7AE /* testSem */,
......@@ -2682,8 +2682,8 @@
4B6BEB4A07A6CCDC00A5DBDA /* Tests */ = {
isa = PBXGroup;
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4BF8D23E0834F1C300C94B91 /* testAtomic.cpp */,
4BF8D2470834F20600C94B91 /* testSem.cpp */,
4BA577BC08BF8BE200F82DE1 /* testSynchroClient.cpp */,
......@@ -4346,9 +4346,9 @@
productReference = 4B35C55E0D4731D2000DE7AE /* jack_freewheel */;
productType = "com.apple.product-type.tool";
};
4B35C5600D4731D2000DE7AE /* jdelay 64 bits */ = {
4B35C5600D4731D2000DE7AE /* jack_iodelay 64 bits */ = {
isa = PBXNativeTarget;
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buildConfigurationList = 4B35C5660D4731D2000DE7AE /* Build configuration list for PBXNativeTarget "jack_iodelay 64 bits" */;
buildPhases = (
4B35C5610D4731D2000DE7AE /* Headers */,
4B35C5620D4731D2000DE7AE /* Sources */,
......@@ -4359,10 +4359,10 @@
);
dependencies = (
);
name = "jdelay 64 bits";
name = "jack_iodelay 64 bits";
productInstallPath = /usr/local/bin;
productName = jack_lsp;
productReference = 4B35C56A0D4731D2000DE7AE /* jdelay */;
productReference = 4B35C56A0D4731D2000DE7AE /* jack_iodelay */;
productType = "com.apple.product-type.tool";
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4B35C56C0D4731D2000DE7AE /* jack_external_metro 64 bits */ = {
......@@ -5643,9 +5643,9 @@
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productType = "com.apple.product-type.tool";
};
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isa = PBXNativeTarget;
buildConfigurationList = 4BFA999E0AAAF3B0009E916C /* Build configuration list for PBXNativeTarget "jdelay Universal" */;
buildConfigurationList = 4BFA999E0AAAF3B0009E916C /* Build configuration list for PBXNativeTarget "jack_iodelay Universal" */;
buildPhases = (
4BFA99990AAAF3B0009E916C /* Headers */,
4BFA999A0AAAF3B0009E916C /* Sources */,
......@@ -5656,10 +5656,10 @@
);
dependencies = (
);
name = "jdelay Universal";
name = "jack_iodelay Universal";
productInstallPath = /usr/local/bin;
productName = jack_lsp;
productReference = 4BFA99A20AAAF3B0009E916C /* jdelay */;
productReference = 4BFA99A20AAAF3B0009E916C /* jack_iodelay */;
productType = "com.apple.product-type.tool";
};
BA222AC50DC88132001A17F4 /* jack_net Universal */ = {
......@@ -5729,7 +5729,7 @@
4B699CD1097D421600A18468 /* jack_connect Universal */,
4B699CE1097D421600A18468 /* jack_disconnect Universal */,
4B699CF1097D421600A18468 /* jack_freewheel Universal */,
4BFA99980AAAF3B0009E916C /* jdelay Universal */,
4BFA99980AAAF3B0009E916C /* jack_iodelay Universal */,
4B699D03097D421600A18468 /* jack_external_metro Universal */,
4B699D13097D421600A18468 /* testAtomic Universal */,
4B699D27097D421600A18468 /* testSem Universal */,
......@@ -5775,7 +5775,7 @@
4B35C53A0D4731D1000DE7AE /* jack_connect 64 bits */,
4B35C5460D4731D1000DE7AE /* jack_disconnect 64 bits */,
4B35C5520D4731D2000DE7AE /* jack_freewheel 64 bits */,
4B35C5600D4731D2000DE7AE /* jdelay 64 bits */,
4B35C5600D4731D2000DE7AE /* jack_iodelay 64 bits */,
4B35C56C0D4731D2000DE7AE /* jack_external_metro 64 bits */,
4B35C5780D4731D2000DE7AE /* testAtomic 64 bits */,
4B35C5880D4731D2000DE7AE /* testSem 64 bits */,
......@@ -6573,7 +6573,7 @@
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buildActionMask = 2147483647;
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runOnlyForDeploymentPostprocessing = 0;
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......@@ -7308,7 +7308,7 @@
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buildActionMask = 2147483647;
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4B3814201327AA6800C61B14 /* iodelay.cpp in Sources */,
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runOnlyForDeploymentPostprocessing = 0;
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......@@ -7433,7 +7433,7 @@
};
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isa = PBXTargetDependency;
target = 4B35C5600D4731D2000DE7AE /* jdelay 64 bits */;
target = 4B35C5600D4731D2000DE7AE /* jack_iodelay 64 bits */;
targetProxy = 4B35C6930D4733B9000DE7AE /* PBXContainerItemProxy */;
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4B35C6960D4733B9000DE7AE /* PBXTargetDependency */ = {
......@@ -7698,7 +7698,7 @@
};
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isa = PBXTargetDependency;
target = 4BFA99980AAAF3B0009E916C /* jdelay Universal */;
target = 4BFA99980AAAF3B0009E916C /* jack_iodelay Universal */;
targetProxy = 4BFA99AB0AAAF41D009E916C /* PBXContainerItemProxy */;
};
BA222AF00DC883EF001A17F4 /* PBXTargetDependency */ = {
......@@ -9777,7 +9777,7 @@
Jackmp,
);
OTHER_REZFLAGS = "";
PRODUCT_NAME = jdelay;
PRODUCT_NAME = jack_iodelay;
REZ_EXECUTABLE = YES;
SDKROOT = "";
SECTORDER_FLAGS = "";
......@@ -9806,7 +9806,7 @@
Jackmp,
);
OTHER_REZFLAGS = "";
PRODUCT_NAME = jdelay;
PRODUCT_NAME = jack_iodelay;
REZ_EXECUTABLE = YES;
SDKROOT = "";
SECTORDER_FLAGS = "";
......@@ -18049,7 +18049,7 @@
Jackmp,
);
OTHER_REZFLAGS = "";
PRODUCT_NAME = jdelay;
PRODUCT_NAME = jack_iodelay;
REZ_EXECUTABLE = YES;
SDKROOT = "";
SECTORDER_FLAGS = "";
......@@ -18080,7 +18080,7 @@
Jackmp,
);
OTHER_REZFLAGS = "";
PRODUCT_NAME = jdelay;
PRODUCT_NAME = jack_iodelay;
REZ_EXECUTABLE = YES;
SDKROOT = "";
SECTORDER_FLAGS = "";
......@@ -18581,7 +18581,7 @@
defaultConfigurationIsVisible = 0;
defaultConfigurationName = Default;
};
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buildConfigurations = (
4B35C5670D4731D2000DE7AE /* Development */,
......@@ -19311,7 +19311,7 @@
defaultConfigurationIsVisible = 0;
defaultConfigurationName = Default;
};
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isa = XCConfigurationList;
buildConfigurations = (
4BFA999F0AAAF3B0009E916C /* Development */,
......
.TH JACK_IODELAY "1" "!DATE!" "!VERSION!"
.SH NAME
jack_iodelay \- JACK toolkit client to measure roundtrip latency
.SH SYNOPSIS
.B jack_iodelay
.SH DESCRIPTION
.B jack_iodelay
will create one input and one output port, and then
measures the latency (signal delay) between them. For this to work,
the output port must be connected to its input port. The measurement
is accurate to a resolution of greater than 1 sample.
.PP
The expected use is to connect jack_iodelay's output port to a
hardware playback port, then use a physical loopback cable from the
corresponding hardware output connector to an input connector, and to
connect that corresponding hardware capture port to jack_iodelay's
input port. This creates a roundtrip that goes through any
analog-to-digital or digital-converters that are present in the audio
hardware.
.PP
Although the hardware loopback latency is the expected use, it is also
possible to use jack_iodelay to measure the latency along any fully
connected signal path, such as those involving other JACK clients.
.PP
Once jack_iodelay completes its measurement it will print the total
latency it has detected. This will include the JACK period length in
addition to any other latency in the signal path. It will continue to
print the value every 0.5 seconds or so so that if you wish you can
vary aspects of the signal path to see their effect on the measured
latency.
.PP
If no incoming signal is detected from the input port, jack_iodelay
will print
.PP
\fT Signal below threshold... .\fR
.PP
every second until this changes (e.g. until you establish the correct connections).
.PP
To use the value measured by jack_iodelay with the -I and -O arguments
of a JACK backend (also called Input Latency and Output Latency in the
setup dialog of qjackctl), you must subtract the JACK period size from
the result. Then, if you believe that the latency is equally
distributed between the input and output parts of your audio hardware
(extremely likely), divide the result by two and use that for input
and/or output latency value. Doing this measurement will enable JACK
clients that use the JACK latency API to accurately position/delay
audio to keep signals synchronized even when there are inherent delays
in the end-to-end signal pathways.
.SH AUTHOR
Originally written in C++ by Fons Adriensen, ported to C by Torben Hohn.
......@@ -9,7 +9,7 @@ test_programs = {
#'testSem': ['testSem.cpp'],
'jack_test': ['test.cpp'],
'jack_cpu': ['cpu.c'],
'jack_delay': ['jdelay.cpp'],
'jack_iodelay': ['jack_iodelay.cpp'],
'jack_multiple_metro' : ['external_metro.cpp'],
}
......
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