Commit Graph

14 Commits

Author SHA1 Message Date
Uwe Hermann c43cf4d40e alsa: Use std_dev_clear(). 2013-06-02 16:46:17 +02:00
Joel Holdsworth f0b6ae19a8 alsa: Set the probe index 2013-04-14 23:39:15 +02:00
Bert Vermeulen aa0dbd683c alsa: Adjust to GVariant-based sr_config_* functions 2013-04-11 18:32:07 +02:00
Bert Vermeulen 69e19dd769 Always interleave analog data with all enabled probes.
The new "probes" field in sr_datafeed_analog contains a copy
of all enabled struct sr_probe.
2013-01-23 03:40:44 +01:00
Uwe Hermann 3d6de074a4 alsa: Silence ALSA scanning process.
Errors while opening or configuring ALSA devices during scan for devices
should not be shown by default (i.e., no sr_err() usage). Non-working
or non-accessible devices (due to permissions or other reasons) will
simply not show up in frontends. Use sr_dbg() instead of sr_err().
2013-01-16 00:02:24 +01:00
Uwe Hermann 21d3d4ee87 alsa: Add some more samplerates.
Add some more samplerates that seem to be supported by some devices
(found via random grepping of alsa and kernel sources).
2013-01-01 00:37:18 +01:00
Uwe Hermann a1b9a9bf44 alsa: Add missing % for PRIu64. 2013-01-01 00:37:17 +01:00
Uwe Hermann 52ba6e05d5 alsa: Improved error reporting. 2013-01-01 00:37:17 +01:00
Uwe Hermann 721ecf3d97 alsa: Cosmetics, coding style, typos. 2013-01-01 00:37:17 +01:00
Alexandru Gagniuc 65faa197ae alsa: Find supported samplerates during device scan
Since we are using the 'hw' interface of ALSA, we don't have the luxury of
samplerate conversion, given by the 'plughw' interface. If we try to set a
samplerate that is not supported, ALSA will just throw an error.

We can test for the supported samplerates, and create a list of supported
samplerates, then limit the selection to only those values. The frontend can
query the list of supported samplerates.

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
2013-01-01 00:37:17 +01:00
Alexandru Gagniuc 729850c9e7 alsa: Fix sample acquisition and send normalized values
The alsa driver requested signed 16-bit integers from ALSA, but casted them to
to an unsigned 16bit before finally casting them to a float. The end result was
that half of the wave would be clipped off.
We also requested data in little endian format. ALSA can be instructed to send
data with the correct endianness for the platform, without needing to worry
about what that is.

This patch attempts three points, which, together, fix the acquisition:
1) Request data from ALSA without specifying endianness; ALSA will handle the
endianness.
2) Simplify the int16_t to float loop by using straightforward indexes.
3) Normalize every value before sending it on the session bus.

NOTE: If testing with PulseView, it will appear as if sigrok is sending all
zeroes. sigrok is sending correct data, but since the data is normalized,
PulseView will incorrectly plot it as a straight line.

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
2013-01-01 00:37:17 +01:00
Alexandru Gagniuc 6944b2d02f alsa: Scan all soundcards and create a sigrok device per input
The alsa driver only works with device "default". This limits the driver's
scope to whatever device ALSA deems to be "default". It is desirable to have
access to all ALSA devices from sigrok.

Change the alsa device scan so that:
Each alsa device (not alsa card) gets its own sigrok device
For example,
    hw:1,0 == sigrok device 0
    hw:1,1 == sigrok device 1
    hw:2,0 == sigrok device 2
    hw:2,1 == sigrok device 3
    hw:2,2 == sigrok device 4
    [...]

We don't currently look at alsa subdevices. We only use subdevice 0.
Every input device will have its own channels (left, right, etc). Each of
those channels gets mapped to a different sigrok probe. A device with 4
channels will have 4 probes from sigrok's perspective.

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
2013-01-01 00:37:17 +01:00
Uwe Hermann 35e199da50 Fix limit_samples check in various drivers.
Check whether a sample limit was actually set (> 0) before checking if
that sample limit is reached. This also fixes continuous acquisition mode
for drivers which have that.
2012-12-26 02:11:00 +01:00
Alexandru Gagniuc 9cd9f6b71c alsa: Split into api.c and protocol.c
This is the driver model agreed upon for all drivers.

As a result of the split, a devc->num_probes field had to be added in order to
reduce the interdependence between api.c and protocol.c .

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
2012-12-23 17:25:37 +01:00