This error code can be used e.g. with echo reference PCM devices (the SND_USE_CASE_MOD_ECHO_REF UCM token).
Signed-off-by: Kai Vehmanen kai.vehmanen@linux.intel.com --- src/pcm/pcm.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/src/pcm/pcm.c b/src/pcm/pcm.c index 1064044c9812..488a8dd0493d 100644 --- a/src/pcm/pcm.c +++ b/src/pcm/pcm.c @@ -292,6 +292,14 @@ This error can happen when device is physically removed (for example some hotplug devices like USB or PCMCIA, CardBus or ExpressCard can be removed on the fly).
+\par -ENODATA + +This error can happen if the device data transfer is dependent on +an external condition and that condition is not met. For example, +PCM device for echo reference as described by SND_USE_CASE_MOD_ECHO_REF +UCM token, may return -ENODATA if the linked playback stream has not been +started. + \section pcm_params Managing parameters
The ALSA PCM device uses two groups of PCM related parameters. The hardware