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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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16
src/modules/bluetooth/a2dp-codec-util.c
View file

@ -23,6 +23,9 @@
#include <pulsecore/core.h>
#include <pulsecore/core-util.h>
#if defined(HAVE_GSTAPTX) || defined(HAVE_GSTLDAC)
#include <gst/gst.h>
#endif
#include "a2dp-codec-util.h"
@ -72,3 +75,16 @@ const pa_a2dp_codec *pa_bluetooth_get_a2dp_codec(const char *name) {
return NULL;
}
void pa_bluetooth_a2dp_codec_gst_init(void) {
#if defined(HAVE_GSTAPTX) || defined(HAVE_GSTLDAC)
GError *error = NULL;
if (!gst_init_check(NULL, NULL, &error)) {
pa_log_error("Could not initialise GStreamer: %s", error->message);
g_error_free(error);
return;
}
pa_log_info("GStreamer initialisation done");
#endif
}