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bluetooth: Introduce a can_be_supported API for A2DP codecs

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This API internally checks if a requested codec can be supported on the
system. This is especially required for codecs supported via GStreamer
where the availability of a plugin decides if the said codec can be
supported.

This will be used to prevent registration of a codec which the remote
endpoint device might be able to support, but, PulseAudio can't as the
codec is not available on the system due to the absence of a plugin.
We can also prevent listing or switching to an unavailable codec.

Note that the codec negotiation happens with the bluez stack even before
a device is connected. Because of this, we need to make sure that gst_init
is called before checking for the availability of a plugin. Since
module-bluez5-device gets loaded only after a connection to the device
has been established, doing the gst_init in that or one of the bluetooth
modules is not feasible.

Part-of: <https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/440>
This commit is contained in:
Sanchayan Maity 2021-01-01 19:32:37 +05:30
parent 6044169763
commit d61493640e
8 changed files with 69 additions and 7 deletions
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3
src/modules/bluetooth/a2dp-codec-util.h
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@ -31,4 +31,7 @@ const pa_a2dp_codec *pa_bluetooth_a2dp_codec_iter(unsigned int i);
/* Get codec by name */
const pa_a2dp_codec *pa_bluetooth_get_a2dp_codec(const char *name);
/* Initialise GStreamer */
void pa_bluetooth_a2dp_codec_gst_init(void);
#endif