Commit graph

10 commits

Author SHA1 Message Date
Mathieu Duponchelle
ab2dc21b9b webrtcdsp: expose new properties.
This gives the user more control over the gain control
and experimental gain control behaviour.

https://bugzilla.gnome.org/show_bug.cgi?id=779103
2017-02-23 03:00:26 +01:00
Nicolas Dufresne
74c0d5fdd2 webrtcdsp: Add delay-agnostic property
In this mode, we let WebRTC Audio Processing figure-out the delay. This
is useful when the latency reported by the stack cannot be trusted. Note
that in this mode, the leaking of echo during packet lost is much worst.
It is recommanded to use PLC (e.g. spanplc, or opus built-in plc).

In this mode, we don't do any synchronization. Instead, we simply process all
the available reverse stream data as it comes.
2016-07-13 23:17:21 -04:00
Nicolas Dufresne
d992f49cb7 webrtcdsp: Workaround GCC/MingW 4.7 limitations
It refuses to initialize a classes using brackets notation. This is
to allow building using our mingw version.
2016-07-05 09:23:11 -04:00
Nicolas Dufresne
71c9cdeff4 webrtcdsp: Rewrite echo data synchronization
The previous code would run out of sync if there was packet lost
or clock skews. When that happened, the echo cancellation feature would
completely stop working. As this is crucial for audio calls, this patch
re-implement synchronization completely.

Instead of letting it drift until next discont, we now synchronize
against the record data at every iteration. This way we simply never
let the stream drift for longer then 10ms period. We also shorter the
delay by using the latency up the probe (basically excluding the sink
latency. This is a decent delay to avoid starving in the probe queue.

https://bugzilla.gnome.org/show_bug.cgi?id=768009
2016-06-30 09:27:03 -04:00
Nicolas Dufresne
e35e23b734 webrtcdsp: We now fail if there is no echo probe
When echo cancel is enabled, we now fail the pipeline if there is
not echo probe. For this reason there is no need to check if probe
pointer is set anymore.
2016-06-30 09:27:03 -04:00
Nicolas Dufresne
c551a853b3 webrtcdsp: Offset timestamp with duration
The saved timestamp is used to compute the delay of the probe data.
As it's used at the following incoming buffer, it needs to be offset
with the duration of the buffer to represent the end position. Also,
properly initialize the saved timestamp and protect against TIME_NONE.
2016-06-23 08:04:18 -04:00
Nicolas Dufresne
86aa3b5f9c webrtcdsp: Synchronize with delays
Until now, we were synchronizing both DSP and Probe adapter by
waiting and clipping the probe adapter data. This increases the CPU
usage, can cause copies if the audio is not 10ms aligned and the worst
is that it prevents the processing from compensating for inaccurate
latency. This is also a step forward toward supporting playback
filters.
2016-06-22 22:34:25 -04:00
Nicolas Dufresne
fb8662eb5c webrtdsp: Remove restriction on channels number
Unlike 0.1, in 0.2 the reverse stream can have different number of
channels. Remove the check that restrict it.
2016-06-22 22:34:25 -04:00
Nicolas Dufresne
89b193c0a9 webrtcdsp: Style fix 2016-06-22 22:34:25 -04:00
Nicolas Dufresne
398f7059fc webrtcdsp: Add WebRTC Audio Processing support
This DSP library can be used to enhance voice signal for real time
communication call. In implements multiple filters like noise reduction,
high pass filter, echo cancellation, automatic gain control, etc.

The webrtcdsp element can be used along, or with the help of the
webrtcechoprobe if echo cancellation is enabled. The echo probe should
be placed as close as possible to the audio sink, while the DSP is
generally place close to the audio capture. For local testing, one can
use an echo loop pipeline like the following:

  autoaudiosrc ! webrtcdsp ! webrtcechoprobe ! autoaudiosink

This pipeline should produce a single echo rather then repeated echo.
Those elements works if they are placed in the same top level pipeline.

https://bugzilla.gnome.org/show_bug.cgi?id=767800
2016-06-21 13:46:00 -04:00