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audio policy: added flag for primary output

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Added a flag for output stream attributes indicating a primary
audio output stream.
The primary audio output stream is unique on a platform and receives all volume,
routing and parameters related to telephony use case.

Change-Id: Ic50b3c02cc60805031f26b819da6cf9ad65ad11c
This commit is contained in:
Eric Laurent 2012-03-01 18:08:10 -08:00
parent 78f6bcf853
commit 11fd2beea0
1 changed files with 15 additions and 4 deletions
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19
include/system/audio_policy.h
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@ -30,12 +30,23 @@ __BEGIN_DECLS
* frameworks/base/include/media/AudioSystem.h
*/
/* request to open a direct output with get_output() (by opposition to
* sharing an output with other AudioTracks)
/* the audio output flags serve two purposes:
* - when an AudioTrack is created they indicate a "wish" to be connected to an output stream with
* attributes corresponding to the specified flags
* - when present in an output profile descriptor listed for a particular audio hardware module,
* they indicate that an output stream can be opened that supports the attributes indicated by
* the flags.
* the audio policy manager will try to match the flags in the request (when getOuput() is called)
* to an available output stream.
*/
typedef enum {
AUDIO_POLICY_OUTPUT_FLAG_NONE = 0x0,
AUDIO_POLICY_OUTPUT_FLAG_DIRECT = 0x1
AUDIO_POLICY_OUTPUT_FLAG_NONE = 0x0, // no attributes
AUDIO_POLICY_OUTPUT_FLAG_DIRECT = 0x1, // this output directly connects a track to one output
// stream (no software mixer)
AUDIO_POLICY_OUTPUT_FLAG_PRIMARY = 0x2 // this output is the primary output of the device.
// it is unique and must be present. it is opened by
// default and receives routing, audio mode and
// volume controls related to voice calls.
} audio_policy_output_flags_t;
/* device categories used for audio_policy->set_force_use() */