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Commit de8d0e43 authored by Steve Kondik's avatar Steve Kondik Committed by Bruno Martins
Browse files

audiopolicy: Add AudioSessionInfo API 

 * This patch introduces a new API which allows applications to
   query the state of the audio effects system, and receive
   callbacks with the necessary information to attach effects
   to any stream.
 * In the future, this may come as part of the AudioPort system,
   but since that's an active area of development by Google, we
   will dodge it for now.
 * The policy now simply keeps a refcounted list of objects which
   hold various bits of stream metadata. Callbacks are sent on
   stream open/close to applications which might be listening
   for them.

Change-Id: I2d554d36e1378f4eb7b276010a3bfe8345c22ecd

audiopolicy: Constrain session events to music streams

 * We're really only interested in music streams right now, but
   events are being generated for all streams (system sounds, etc).
 * Constrain for now, in the future we will filter based on client
   registrations.

Change-Id: Ic445052028c454eed146addebcdb28c4b26c4f20

Author: Zhao Wei Liew <zhaoweiliew@gmail.com>
audiopolicy: Use audio_session_t consistently for AudioSessionInfo

In N, the usage of audio_session_t was made more consistent in the
commit d848eb48.

Do the same for the AudioSessionInfo API.

Change-Id: I8732225ec6788777e7be9ed42f2ca4002af47c3b

[mikeioannina]: Update for Oreo
[bgcngm]: Update for Pie

Change-Id: I2d554d36e1378f4eb7b276010a3bfe8345c22ecd
parent fa818d9a

include/media/AudioSession.h

0 → 120000
+1 −0
Original line number Diff line number Diff line 
../../media/libaudioclient/include/media/AudioSession.h
 
 No newline at end of file

media/libaudioclient/AudioSystem.cpp

+38 −0
Original line number Diff line number Diff line
@@ -39,6 +39,7 @@ Mutex AudioSystem::gLockAPS; 
sp<IAudioFlinger> AudioSystem::gAudioFlinger;

sp<AudioSystem::AudioFlingerClient> AudioSystem::gAudioFlingerClient;

audio_error_callback AudioSystem::gAudioErrorCallback = NULL;

audio_session_callback AudioSystem::gAudioSessionCallback = NULL;

dynamic_policy_callback AudioSystem::gDynPolicyCallback = NULL;

record_config_callback AudioSystem::gRecordConfigCallback = NULL;
@@ -734,6 +735,17 @@ status_t AudioSystem::AudioFlingerClient::removeAudioDeviceCallback( 
    gRecordConfigCallback = cb;

}



/*static*/ status_t AudioSystem::setAudioSessionCallback(audio_session_callback cb)

{

    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();

    if (aps == 0) return PERMISSION_DENIED;



    Mutex::Autolock _l(gLock);

    gAudioSessionCallback = cb;



    return NO_ERROR;

}



// client singleton for AudioPolicyService binder interface

// protected by gLockAPS

sp<IAudioPolicyService> AudioSystem::gAudioPolicyService;
@@ -1383,6 +1395,32 @@ void AudioSystem::AudioPolicyServiceClient::onRecordingConfigurationUpdate( 
    }

}



// ---------------------------------------------------------------------------



status_t AudioSystem::listAudioSessions(audio_stream_type_t stream,

                                        Vector< sp<AudioSessionInfo>> &sessions)

{

    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();

    if (aps == 0) return PERMISSION_DENIED;

    return aps->listAudioSessions(stream, sessions);

}



void AudioSystem::AudioPolicyServiceClient::onOutputSessionEffectsUpdate(

        sp<AudioSessionInfo>& info, bool added)

{

    ALOGV("AudioPolicyServiceClient::onOutputSessionEffectsUpdate(%d, %d, %d)",

            info->mStream, info->mSessionId, added);

    audio_session_callback cb = NULL;

    {

        Mutex::Autolock _l(AudioSystem::gLock);

        cb = gAudioSessionCallback;

    }



    if (cb != NULL) {

        cb(AUDIO_OUTPUT_SESSION_EFFECTS_UPDATE, info, added);

    }

}



void AudioSystem::AudioPolicyServiceClient::binderDied(const wp<IBinder>& who __unused)

{

    {

media/libaudioclient/IAudioPolicyService.cpp

+42 −1
Original line number Diff line number Diff line
@@ -82,7 +82,8 @@ enum { 
    GET_MASTER_MONO,

    GET_STREAM_VOLUME_DB,

    GET_SURROUND_FORMATS,

    SET_SURROUND_FORMAT_ENABLED

    SET_SURROUND_FORMAT_ENABLED,

    LIST_AUDIO_SESSIONS

};



#define MAX_ITEMS_PER_LIST 1024
@@ -879,6 +880,29 @@ public: 
        }

        return reply.readInt32();

    }



    virtual status_t listAudioSessions(audio_stream_type_t streams,

                                       Vector< sp<AudioSessionInfo>> &sessions)

    {

        Parcel data, reply;

        data.writeInterfaceToken(IAudioPolicyService::getInterfaceDescriptor());

        data.writeInt32(streams);

        status_t status = remote()->transact(LIST_AUDIO_SESSIONS, data, &reply);

        if (status != NO_ERROR) {

            return status;

        }



        status = reply.readInt32();

        if (status == NO_ERROR) {

            size_t size = (size_t)reply.readUint32();

            for (size_t i = 0; i < size && reply.dataAvail() > 0; i++) {

                sp<AudioSessionInfo> info = new AudioSessionInfo();

                info->readFromParcel(reply);

                sessions.push_back(info);

            }

        }

        return status;

    }

};



IMPLEMENT_META_INTERFACE(AudioPolicyService, "android.media.IAudioPolicyService");
@@ -1436,6 +1460,23 @@ status_t BnAudioPolicyService::onTransact( 
            return NO_ERROR;

        } break;



        case LIST_AUDIO_SESSIONS: {

            CHECK_INTERFACE(IAudioPolicyService, data, reply);

            audio_stream_type_t streams = (audio_stream_type_t)data.readInt32();



            Vector< sp<AudioSessionInfo>> sessions;

            status_t status = listAudioSessions(streams, sessions);



            reply->writeInt32(status);

            if (status == NO_ERROR) {

                reply->writeUint32(static_cast<uint32_t>(sessions.size()));

                for (size_t i = 0; i < sessions.size(); i++) {

                    sessions[i]->writeToParcel(reply);

                }

            }

            return NO_ERROR;

        }



        case ACQUIRE_SOUNDTRIGGER_SESSION: {

            CHECK_INTERFACE(IAudioPolicyService, data, reply);

            sp<IAudioPolicyServiceClient> client = interface_cast<IAudioPolicyServiceClient>(

media/libaudioclient/IAudioPolicyServiceClient.cpp

+29 −1
Original line number Diff line number Diff line
@@ -31,7 +31,8 @@ enum { 
    PORT_LIST_UPDATE = IBinder::FIRST_CALL_TRANSACTION,

    PATCH_LIST_UPDATE,

    MIX_STATE_UPDATE,

    RECORDING_CONFIGURATION_UPDATE

    RECORDING_CONFIGURATION_UPDATE,

    OUTPUT_SESSION_EFFECTS_UPDATE

};



// ----------------------------------------------------------------------
@@ -104,6 +105,19 @@ public: 
        data.writeInt32(patchHandle);

        remote()->transact(RECORDING_CONFIGURATION_UPDATE, data, &reply, IBinder::FLAG_ONEWAY);

    }



    void onOutputSessionEffectsUpdate(sp<AudioSessionInfo>& info, bool added)

    {

        Parcel data, reply;

        data.writeInterfaceToken(IAudioPolicyServiceClient::getInterfaceDescriptor());

        data.writeInt32(info->mStream);

        data.writeInt32(info->mSessionId);

        data.writeInt32(info->mFlags);

        data.writeInt32(info->mChannelMask);

        data.writeInt32(info->mUid);

        data.writeInt32(added ? 1 : 0);

        remote()->transact(OUTPUT_SESSION_EFFECTS_UPDATE, data, &reply, IBinder::FLAG_ONEWAY);

    }

};



IMPLEMENT_META_INTERFACE(AudioPolicyServiceClient, "android.media.IAudioPolicyServiceClient");
@@ -145,6 +159,20 @@ status_t BnAudioPolicyServiceClient::onTransact( 
                    patchHandle);

            return NO_ERROR;

        } break;

    case OUTPUT_SESSION_EFFECTS_UPDATE: {

            CHECK_INTERFACE(IAudioPolicyServiceClient, data, reply);

            audio_stream_type_t stream = static_cast<audio_stream_type_t>(data.readInt32());

            audio_session_t sessionId = static_cast<audio_session_t>(data.readInt32());

            audio_output_flags_t flags = static_cast<audio_output_flags_t>(data.readInt32());

            audio_channel_mask_t channelMask = static_cast<audio_channel_mask_t>(data.readInt32());

            uid_t uid = static_cast<uid_t>(data.readInt32());

            bool added = data.readInt32() > 0;



            sp<AudioSessionInfo> info = new AudioSessionInfo(

                    sessionId, stream, flags, channelMask, uid);

            onOutputSessionEffectsUpdate(info, added);

            return NO_ERROR;

        } break;

    default:

        return BBinder::onTransact(code, data, reply, flags);

    }

media/libaudioclient/include/media/AudioPolicy.h

+2 −0
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 
#include <binder/Parcel.h>

#include <utils/String8.h>

#include <utils/Vector.h>

#include <media/AudioSession.h>



namespace android {
@@ -44,6 +45,7 @@ namespace android { 
//   AudioSystem's implementation of the AudioPolicyClient interface

// keep in sync with AudioSystem.java

#define DYNAMIC_POLICY_EVENT_MIX_STATE_UPDATE 0

#define AUDIO_OUTPUT_SESSION_EFFECTS_UPDATE 10



#define MIX_STATE_DISABLED (-1)

#define MIX_STATE_IDLE 0