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bluetooth: Perform software attenuation until HF/HS reports gain control

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HF/HS hardware attenuation is optional on HFP: the peer indicates
support with the AT+BRSF command, when bit 4 is set.  That does not
explicitly mandate speaker or microphone gain control; either is
dynamically detected as soon as `AT+VG[MS]=` is received.  Otherwise
software attenuation is performed.

It is also optional on HSP but nothing is mentioned about feature
detection, assume it is the same as HFP: perform software attenuation
until the HF/HS peer sends an `AT+VG[MS]=` command.

When PA is a HS/HF (and the peer the AG) we attenuate both channels in
software and unconditionally keep the peer up to date with
`AT+VGM/AT+VGS` commands.

Part-of: <https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/521>
This commit is contained in:
Marijn Suijten 2021-03-05 23:28:57 +01:00
parent 9c847b16a8
commit d510ddc7fb
2 changed files with 42 additions and 15 deletions
Download patch file Download diff file Expand all files Collapse all files

45
src/modules/bluetooth/backend-native.c
View file

@ -473,6 +473,9 @@ static void transport_put(pa_bluetooth_transport *t)
pa_log_debug("Transport %s available for profile %s", t->path, pa_bluetooth_profile_to_string(t->profile));
}
static pa_volume_t set_sink_volume(pa_bluetooth_transport *t, pa_volume_t volume);
static pa_volume_t set_source_volume(pa_bluetooth_transport *t, pa_volume_t volume);
static bool hfp_rfcomm_handle(int fd, pa_bluetooth_transport *t, const char *buf)
{
struct hfp_config *c = t->config;
@ -480,11 +483,12 @@ static bool hfp_rfcomm_handle(int fd, pa_bluetooth_transport *t, const char *buf
/* stateful negotiation */
if (c->state == 0 && sscanf(buf, "AT+BRSF=%d", &val) == 1) {
c->capabilities = val;
pa_log_info("HFP capabilities returns 0x%x", val);
rfcomm_write_response(fd, "+BRSF: %d", hfp_features);
c->state = 1;
return true;
c->capabilities = val;
pa_log_info("HFP capabilities returns 0x%x", val);
rfcomm_write_response(fd, "+BRSF: %d", hfp_features);
c->state = 1;
return true;
} else if (c->state == 1 && pa_startswith(buf, "AT+CIND=?")) {
/* we declare minimal no indicators */
rfcomm_write_response(fd, "+CIND: "
@ -557,11 +561,21 @@ static void rfcomm_io_callback(pa_mainloop_api *io, pa_io_event *e, int fd, pa_i
* RING: Sent by AG to HS to notify of an incoming call. It can safely be ignored because
* it does not expect a reply. */
if (sscanf(buf, "AT+VGS=%d", &gain) == 1 || sscanf(buf, "\r\n+VGM=%d\r\n", &gain) == 1) {
if (!t->set_sink_volume) {
pa_log_debug("HS/HF peer supports speaker gain control");
t->set_sink_volume = set_sink_volume;
}
t->sink_volume = hsp_gain_to_volume(gain);
pa_hook_fire(pa_bluetooth_discovery_hook(t->device->discovery, PA_BLUETOOTH_HOOK_TRANSPORT_SINK_VOLUME_CHANGED), t);
do_reply = true;
} else if (sscanf(buf, "AT+VGM=%d", &gain) == 1 || sscanf(buf, "\r\n+VGS=%d\r\n", &gain) == 1) {
if (!t->set_source_volume) {
pa_log_debug("HS/HF peer supports microphone gain control");
t->set_source_volume = set_source_volume;
}
t->source_volume = hsp_gain_to_volume(gain);
pa_hook_fire(pa_bluetooth_discovery_hook(t->device->discovery, PA_BLUETOOTH_HOOK_TRANSPORT_SOURCE_VOLUME_CHANGED), t);
do_reply = true;
@ -717,8 +731,25 @@ static DBusMessage *profile_new_connection(DBusConnection *conn, DBusMessage *m,
t->acquire = sco_acquire_cb;
t->release = sco_release_cb;
t->destroy = transport_destroy;
t->set_sink_volume = set_sink_volume;
t->set_source_volume = set_source_volume;
/* If PA is the HF/HS we are in control of volume attenuation and
* can always send volume commands (notifications) to keep the peer
* updated on actual volume value.
*
* If the peer is the HF/HS it is responsible for attenuation of both
* speaker and microphone gain.
* On HFP speaker/microphone gain support is reported by bit 4 in the
* `AT+BRSF=` command. Since it isn't explicitly documented whether this
* applies to speaker or microphone gain but the peer is required to send
* an initial value with `AT+VG[MS]=` either callback is hooked
* independently as soon as this command is received.
* On HSP this is not specified and is assumed to be dynamic for both
* speaker and microphone.
*/
if (is_peer_audio_gateway(p)) {
t->set_sink_volume = set_sink_volume;
t->set_source_volume = set_source_volume;
}
trd = pa_xnew0(struct transport_data, 1);
trd->rfcomm_fd = fd;