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Commit 11fd2bee authored by Eric Laurent's avatar Eric Laurent
Browse files

audio policy: added flag for primary output 

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
parent 78f6bcf8

include/system/audio_policy.h

+15 −4
Original line number Diff line number Diff line
@@ -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() */