LinuxLists.cc - [PATCH BlueZ 00/11] AVRCP Absolute Volume Control support

2013-01-11 20:25:23

Subject: [PATCH BlueZ 00/11] AVRCP Absolute Volume Control support

This series implements support for the Absolute Volume Control feature for the
CT role of AVRCP version 1.5.

João Paulo Rechi Vita (11):
transport: Initialize the "Volume" property with 50%
transport: Store the value set through the 'Volume' property
avrcp: Add EVENT_VOLUME_CHANGED to CT capabilities
transport: Get volume from transport
transport: Keep a list o all existent transports
transport: Get volume passing only audio_device
avrcp: Handle RegisterNotification for volume
avrcp: Notify remote of volume changes
transport: Update volume passing only audio_device
avrcp: Handle SetAbsoluteVolume command
audio: Bump AVRCP CT version to 1.5

profiles/audio/avrcp.c | 76 +++++++++++++++++++++++++++++++++++++++++-----
profiles/audio/transport.c | 55 ++++++++++++++++++++++++++++++++-
profiles/audio/transport.h | 6 ++++
3 files changed, 128 insertions(+), 9 deletions(-)

--
1.7.11.7

2013-01-15 18:12:13

by Luiz Augusto von Dentz

[permalink] [raw]

Subject: Re: [PATCH BlueZ v2 01/11] transport: Initialize the "Volume" property

Hi Joao,

On Mon, Jan 14, 2013 at 6:10 PM, Jo?o Paulo Rechi Vita
<[email protected]> wrote:
> ---
> profiles/audio/transport.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/profiles/audio/transport.c b/profiles/audio/transport.c
> index a4370a5..8defc6f 100644
> --- a/profiles/audio/transport.c
> +++ b/profiles/audio/transport.c
> @@ -787,7 +787,6 @@ struct media_transport *media_transport_create(struct media_endpoint *endpoint,
> struct a2dp_transport *a2dp;
>
> a2dp = g_new0(struct a2dp_transport, 1);
> - a2dp->volume = -1;
>
> transport->resume = resume_a2dp;
> transport->suspend = suspend_a2dp;
> @@ -795,14 +794,17 @@ struct media_transport *media_transport_create(struct media_endpoint *endpoint,
> transport->data = a2dp;
> transport->destroy = destroy_a2dp;
>
> - if (strcasecmp(uuid, A2DP_SOURCE_UUID) == 0)
> + if (strcasecmp(uuid, A2DP_SOURCE_UUID) == 0) {
> + a2dp->volume = -1;
> transport->sink_watch = sink_add_state_cb(
> sink_state_changed,
> transport);
> - else
> + } else {
> + a2dp->volume = 127;
> transport->source_watch = source_add_state_cb(
> source_state_changed,
> transport);
> + }
> } else
> goto fail;
>
> --
> 1.7.11.7
>

This set is now upstream, thanks.

--
Luiz Augusto von Dentz

2013-01-15 10:43:14

by Luiz Augusto von Dentz

[permalink] [raw]

Subject: Re: [PATCH BlueZ 01/11] transport: Initialize the "Volume" property with 50%

Hi Oleksandr,

On Tue, Jan 15, 2013 at 10:02 AM, <[email protected]> wrote:
> Hi Joao,
>>
>>Hello Mikel and Luiz,
>>
>>On Mon, Jan 14, 2013 at 12:34 PM, Luiz Augusto von Dentz
>><[email protected]> wrote:
>>> Hi Mikel,
>>>
>>> On Mon, Jan 14, 2013 at 4:55 PM, Mikel Astiz <[email protected]>
>>wrote:
>>>> Hi all,
>>>>
>>>>> Hi Joao,
>>>>>
>>>>> On Mon, Jan 14, 2013 at 4:05 PM, Joao Paulo Rechi Vita
>>>>> <[email protected]> wrote:
>>>>> > On Sun, Jan 13, 2013 at 12:22 PM, Luiz Augusto von Dentz
>>>>> > <[email protected]> wrote:
>>>>> >> Hi Joao,
>>>>> >>
>>>>> >> On Fri, Jan 11, 2013 at 10:25 PM, Jo?o Paulo Rechi Vita
>>>>> >> <[email protected]> wrote:
>>>>> >>> ---
>>>>> >>> profiles/audio/transport.c | 2 +-
>>>>> >>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>>>> >>>
>>>>> >>> diff --git a/profiles/audio/transport.c b/profiles/audio/transport.c
>>>>> >>> index a4370a5..6ffa98a 100644
>>>>> >>> --- a/profiles/audio/transport.c
>>>>> >>> +++ b/profiles/audio/transport.c
>>>>> >>> @@ -787,7 +787,7 @@ struct media_transport
>>>>> *media_transport_create(struct media_endpoint *endpoint,
>>>>> >>> struct a2dp_transport *a2dp;
>>>>> >>>
>>>>> >>> a2dp = g_new0(struct a2dp_transport, 1);
>>>>> >>> - a2dp->volume = -1;
>>>>> >>> + a2dp->volume = 63;
>>>>> >>>
>>>>> >>> transport->resume = resume_a2dp;
>>>>> >>> transport->suspend = suspend_a2dp;
>>>>> >>> --
>>>>> >>> 1.7.11.7
>>>>> >>
>>>>> >> Does the spec say anything regarding this? Actually it seems this
>>>>> >> value must be set by PA if it does support volume notification, which
>>>>> >> means a new version of PA, then it should set the value when the card
>>>>> >> is initialized, otherwise if the endpoint doesn't set a value it
>>>>> >> should remain -1/not available. If volume is not set by the endpoint
>>>>> >> we should either return and error upon register notification or
>>>>> >> return maximum volume always and refuse to SetAbsoluteVolume, my
>>>>> >> guess is that the latter is better for IOP reasons since the remote
>>>>> >> device may register to volume while the endpoint is setting up the
>>>>> >> transport so the volume may be set latter.
>>>>> >>
>>>>> >>
>>>>> >
>>>>> > I agree the right value will come from PA. The problem is that the
>>>>> > org.bluez.MediaTransport.Volume property doesn't exist when volume is
>>>>> > < 0 or > 127 and PA will not be able to inform the correct volume
>>>>> > value. Should we simply remove volume_exists(), or do you have any
>>>>> > other suggestion?
>>>>>
>>>>> I guess we could use the role of transport, if it is a sink/controller
>>transport it
>>>>> should be initialized to max volume otherwise it should still be
>>initialized with
>>>>> -1 so we can continue to omit in case of source/target role.
>>>>
>>>> A side question: AFAIK this feature has been added in AVRCP 1.4. How
>>would the endpoint (PulseAudio) know if it's supported or not by a certain
>>device?
>>>
>>> For the controller/sink role there is no point of PulseAudio knowing
>>> about this, it basically need to set the volume and that about it, if
>>> the remote device is interested it register to be notified otherwise
>>> we don't do anything with the value, plain and simple.
>>>
>>
>>I think PA will also want to register for notifications of changes on
>>that property, so it can reflects the current volume on the remote
>>through the master volume of the bluetooth card. The volume can be
>>changed on the remote side and it will inform bluez through the
>>SetAbsoluteVolume command.
>
> In our current AVRCP implementations, we only set the volume on the
> target to 100%. In this case the target will encode the audio
> with full quality. So the volume on the target is not coupled to the
> volume on the system.

The volume of the stream has nothing to do with the volume we are
talking about here, this is about output volume of the
sink/controller. In fact it is recommended that the stream volume be
constant at 100% to minimize precision errors of the codec.

>>
>>>> My proposal would be that the property is not present if the feature is
>>not supported (or also if AVRCP is not connected). Therefore, I'd propose
>>exposing a special value in D-Bus (i.e. -1) as soon as the feature becomes
>>available (AVRCP 1.4 connected) so the endpoint can set the initial value.
>>>
>>> That is a bad idea, the notification mechanism of AVRCP is not
>>> something I would like to see exposed over D-Bus, it is way too broken
>>> since you have to registration again every time the value changes.
>>>
>>
>>I personally thinks it makes sense to not support the property if
>>AVRCP < 1.4 (this was on my initial plans also), or if the remote
>>doesn't implement AVRCP (A2DP only). We just need to find an elegant
>>way to make this information available for the transport. Otherwise
>>AVRCP will be connected every time A2DP is also connected, right? Or
>>am I missing some corner case here?
>
> Question is do you really want to control the volume of your CT
> from the Target? I can speak from the OEM perspective and this is
> not what we want.

Not sure what you really mean here by not what we want, this is
specification and by not conforming with it you may get into IOP
problems or even not be able to qualify the stack. Note that similar
functionality exist also in HFP with SpeakerGain and MicrophoneGain,
so whatever you have against the phone controlling the output volume
is now past the point that you can say no to it.

--
Luiz Augusto von Dentz

2013-01-15 08:02:46

by Oleksandr.Domin

[permalink] [raw]

Subject: RE: [PATCH BlueZ 01/11] transport: Initialize the "Volume" property with 50%

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2013-01-14 16:10:29

Subject: [PATCH BlueZ 00/11] AVRCP Absolute Volume Control support

Subject: Re: [PATCH BlueZ v2 01/11] transport: Initialize the "Volume" property

Subject: Re: [PATCH BlueZ 01/11] transport: Initialize the "Volume" property with 50%

Subject: RE: [PATCH BlueZ 01/11] transport: Initialize the "Volume" property with 50%

Subject: [PATCH BlueZ v2 01/11] transport: Initialize the "Volume" property

Subject: Re: [PATCH BlueZ 01/11] transport: Initialize the "Volume" property with 50%

Subject: Re: [PATCH BlueZ 01/11] transport: Initialize the "Volume" property with 50%

Subject: Re: [PATCH BlueZ 01/11] transport: Initialize the "Volume" property with 50%

Subject: Re: [PATCH BlueZ 01/11] transport: Initialize the "Volume" property with 50%

Subject: AW: [PATCH BlueZ 01/11] transport: Initialize the "Volume" property with 50%

Subject: Re: [PATCH BlueZ 01/11] transport: Initialize the "Volume" property with 50%

Subject: Re: [PATCH BlueZ 01/11] transport: Initialize the "Volume" property with 50%

Subject: Re: [PATCH BlueZ 01/11] transport: Initialize the "Volume" property with 50%

Subject: [PATCH BlueZ 11/11] audio: Bump AVRCP CT version to 1.5

Subject: [PATCH BlueZ 10/11] avrcp: Handle SetAbsoluteVolume command

Subject: [PATCH BlueZ 04/11] transport: Get volume from transport

Subject: [PATCH BlueZ 06/11] transport: Get volume passing only audio_device

Subject: [PATCH BlueZ 09/11] transport: Update volume passing only audio_device

Subject: [PATCH BlueZ 01/11] transport: Initialize the "Volume" property with 50%

Subject: [PATCH BlueZ 07/11] avrcp: Handle RegisterNotification for volume

Subject: [PATCH BlueZ 03/11] avrcp: Add EVENT_VOLUME_CHANGED to CT capabilities

Subject: [PATCH BlueZ 05/11] transport: Keep a list o all existent transports

Subject: [PATCH BlueZ 08/11] avrcp: Notify remote of volume changes

Subject: [PATCH BlueZ 02/11] transport: Store the value set through the 'Volume' property