CN110196708B - Audio management method applied to android vehicle-mounted multimedia system - Google Patents

Audio management method applied to android vehicle-mounted multimedia system Download PDF

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Publication number
CN110196708B
CN110196708B CN201910338350.1A CN201910338350A CN110196708B CN 110196708 B CN110196708 B CN 110196708B CN 201910338350 A CN201910338350 A CN 201910338350A CN 110196708 B CN110196708 B CN 110196708B
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audio
focus
module
application
android
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CN110196708A (en
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焦见伟
皮振华
卓庆峰
张雨龙
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Shenzhen Cookoo Technology Co ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/16—Sound input; Sound output
    • G06F3/162—Interface to dedicated audio devices, e.g. audio drivers, interface to CODECs
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00—Arrangements for program control, e.g. control units
    • G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/44—Arrangements for executing specific programs
    • G06F9/4401—Bootstrapping
    • G06F9/4411—Configuring for operating with peripheral devices; Loading of device drivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/12—Messaging; Mailboxes; Announcements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/48—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for in-vehicle communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication

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  • Theoretical Computer Science (AREA)
  • Signal Processing (AREA)
  • Software Systems (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Computer Security & Cryptography (AREA)
  • Multimedia (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • General Health & Medical Sciences (AREA)
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  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
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Abstract

The invention discloses an audio management method applied to an android vehicle-mounted multimedia system, which comprises the steps that an application program sends out a focus application and release request through an audio manager module; the CPP audio detection module detects whether a special application program or an external audio channel applies for focus information; if the CPP audio detection module identifies that the audio source of the application focus is a special application program or an external audio channel, the CPP audio detection module sends a message to the MMS information transmission module; the MMS information delivery module performs channel switching or audio control operations by delivering messages to the micro control unit. According to the invention, the sound management strategy of the original android system is modified and replaced, the original sound stack management logic is shielded, the sound Map is used for replacing, and the processing methods such as forced separation of audio streams and the like are carried out on the audio, so that the application of special application programs which are compatible with the android standard are realized, the special sound control of the vehicle-mounted multimedia system can be adapted, and the higher requirement of the vehicle-mounted multimedia system on the audio control is met.

Description

Audio management method applied to android vehicle-mounted multimedia system
Technical Field
The invention relates to the field of automobile central control multimedia systems, in particular to an audio management method applied to an android vehicle-mounted multimedia system.
Background
With the development of science and technology, the vehicle-mounted multimedia system is more and more day by day, and the installable vehicle-mounted application programs are more and more; the audio management system is taken as an important component of the vehicle-mounted multimedia system, and plays a role in not only controlling playing of audio, but also playing of sound in a way of being compatible with various audio standard application programs. At present, most of the vehicle-mounted multimedia systems on the market are modified based on the native android system, the audio coordination mechanism of the native android system has a disadvantage, a developer is required to actively observe the mechanism to develop an application program, if a certain special application program is not applied and developed, the system and other applications are completely free of control and influence on the application of the special application program, the application of a third party application program is very abundant, the audio coordination mechanism of the native android system is not observed when a part of application programs are unaware of development, a driver does not understand the principles, only the application program installed on the vehicle-mounted multimedia system can be normally used, if the application of the special application program is installed on the vehicle-mounted multimedia system, compatibility problems such as audio control can be caused, the use experience of the vehicle-mounted multimedia system is greatly influenced, and the use requirement of the driver on the special application program cannot be met.
Therefore, the inventor feels the need to develop a set of audio management control schemes which can replace the existing native android system so as to improve the compatibility and the practicability of the existing vehicle-mounted multimedia system.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides an audio management method applied to an android vehicle-mounted multimedia system.
The technical scheme of the invention is realized as follows:
an audio management method applied to an android vehicle-mounted multimedia system comprises the following steps:
the application program sends out a focus application and release request through the audio manager module;
the CPP audio detection module detects whether a special application program or an external audio channel applies for focus information;
if the CPP audio detection module identifies that the audio source of the application focus is a special application program or an external audio channel, the CPP audio detection module sends a message to the MMS information transmission module;
the MMS information transmission module feeds back a message processing result to the audio manager module, and the audio manager module informs whether the application program releases focus;
the MMS information transmission module performs channel switching or audio control operation by transmitting a message to the micro control unit.
Further, the MMS messaging module may forcibly separate and independently control audio streams from the application or the specific application.
Further, the MMS information transmission module classifies priorities according to audio types from the application program or the special application program, and the focus with high preemption priority and low preemption priority are mutually exclusive.
Further, the CPP audio detection module detects sound playing and ending operations from the special application or an external audio channel, and sends a processing message to the MMS information transfer module.
Further, the audio manager module enables audio focus control through an audio focus control object.
Further, the MMS information transmission module can also process a voice synthesis TTS broadcast message; the speech synthesis TTS informs the MMS messaging module in a broadcast form, and the MMS messaging module converts the notification into a voice request.
Further, the audio manager module captures different formats of audio stream actions from the application with an audio track thread and a multimedia player thread, respectively.
Further, the priority classes include phone type, recording type, warning tone type, and media type.
Further, the MMS information transmission module synchronizes the self state through the judgment of the special sound state.
Compared with the prior art, the method modifies and replaces the sound management strategy of the original android system, shields the original sound stack management logic by detecting the special application program which does not conform to the android standard of a third party, uses the sound Map to replace, carries out processing methods such as priority and forced separation of the audio stream and the like on the audio, realizes the compatibility of the special application program which does not conform to the android standard, so as to adapt to the special sound control of the vehicle-mounted multimedia system, and meets the higher requirements of the audio control of the vehicle-mounted multimedia system.
Drawings
The invention is described in further detail below in connection with the embodiments in the drawings, but is not to be construed as limiting the invention in any way.
FIG. 1 is a schematic diagram of the principle and structure of the present invention;
FIG. 2 is a flow chart of audio management activities proposed by the present invention;
in the figure: 1. an application program; 2.a special application; 3. an audio manager module; 4. CPP audio detection module; 5. an MMS information transmission module; 6. and a micro control unit.
Detailed Description
The invention is further described below with reference to the accompanying drawings, which are not intended to limit the invention.
As shown in fig. 1 to 2, the audio management method applied to the android in-vehicle multimedia system of the present invention includes:
application 1: the android system upper layer application is used for sending out requests for applying and releasing sound focus;
special application 2: the third party does not follow the upper-layer sound application of the android system standard;
audio manager module 3: audio management, providing application focus information and a release focus interface to the application program 1; processing focus application and release of the application 1, the audio manager module 3 captures different format audio stream actions from the application 1 by audio track program and multimedia player thread respectively, the audio track program is used for processing pulse code modulated audio data, and the multimedia player thread is used for processing audio data such as MP3, AAC, WAV and the like;
CPP audio detection module 4: the bottom layer supporting audio stream processing realized by using the C++/C code provides detection of sound playing and ending, sound and silence states of the special application program 2 which are partially not supported by the android standard audio focus mechanism;
MMS information delivery module 5: the invention is compared with the prior art, remove the original sound logic processing, change to the logic processing of unification by the said MMS information transfer module 5;
and a micro control unit 6: and the singlechip is responsible for switching the sound channels in audio management.
The specific flow method is as follows:
the application 1 processes operations such as pause playing according to an android native Audio Focus management mechanism,
the application 1 applies for sound focus by calling the requestaudiofocus function of the audio manager module 3; releasing focus by an abandonaud focus function of the audio manager module 3; meanwhile, the application program 1 can monitor the change of the current sound focus through the audio manager module 3 to realize an audiomanager.
The sound focus mainly has the following states:
audiofrequency_gain: the audio focus has been obtained, at which time the focused application can play;
audiosource_loss: having lost audio focus for a long time, all audio play must be terminated because after a long loss of focus, no focus return should be expected, which is a good place to clear unused resources as much as possible. For example, the multimedia player object should be released at this time;
audiofrequency_loss_transmission: this means that the audio focus is temporarily lost, but will return soon. At this point, all audio playback must be terminated, but playback resources are reserved, as it may soon return;
audiofrequency_loss_transmission_can_duck: this means that the audio focus has been temporarily lost, but that quiet playing of the audio is allowed.
The audio manager module 3 realizes audio focus control through an audio focus control object, shields a primary sound stack management logic, stores a remote object by using MAP, converts a received focus request and focus release abandon message, then sends the converted focus request and focus release abandon message to the MMS information transfer module 5, and notifies an application through a primary interface after receiving a processing result of the MMS information transfer module 5:
1. the audio manager module 3 receives a request audio focus request, then splices the packet name of the application with the registered interception and the internal register memory address to generate a unique ID of the application, registers the interception with the sound MAP, and then searches the interception of the application corresponding to the sound MAP, and simultaneously releases the focus according to the ID;
2. package name xxxx splice, requestAudioFocus request splice using the application
"# play", abandona advertisement concatenation "# stop", plus header "AMG:", then send to ADDRESS "cpp_amg_mms_address" through information interface (an information interface service of MMS information transfer module);
3. the same application has multiple voice type applications differentiated by the second parameter of the requestAudioFocus.
The CPP audio detection module 4 detects whether a special application program 2 or an external audio channel applies for focus;
if the CPP audio detection module 4 identifies that the audio source of the application focus is a special application 2 or an external audio channel, the CPP audio detection module 4 sends a message to the MMS information transmission module 5;
the MMS information transmission module 5 performs processing according to the audio manager module 3 or the CPP audio detection module 4, the MMS information transmission module 5 receives an "AMG: xxxx#play" or an "AMG: xxxx#stop" or an "xxxxxx#play" or an "xxxxxx#stop" request of the audio manager module 3, and then performs splitting to obtain a state and a packet name, performs logic processing according to a sound classification table and a switching rule, and converts a processing result into a BIOS protocol (a communication protocol established by an ARM and a micro control unit) by referring to a channel definition of the micro control unit 6, and sends the BIOS protocol to the micro control unit 6 to perform channel switching or audio control operation.
The MMS message delivery module 5 generates three sound states "play" representing the focus acquired, "pause" representing the focus temporarily lost, "stop" representing the focus lost, and concatenates the header and the application packet in the format "mms#xxxx# [ play|pause|stop ]," and sends the same to "mms_amg_address" (interface service in the audio manager module) through the message interface.
SRC_STATE RESULT
PLAY AUDIOFOCUS_GAIN
PAUSE AUDIOFOCUS_LOSS_TRANSIENT
Stop AUDIOFOCUS_LOSS
The Audio manager module 3 receives the message from the MMS message transmitting module 5, parses the message to obtain a packet name (ID can be found according to the packet name) and a state, and maps the packet name and the state into different Audio results by referring to the upper table to apply the different Audio results to the upper layer of the application program 1.
The MMS information delivery module 5 also classifies priorities according to audio types from the application 1 or the specific application 2, the priorities including phone types (BT, 3g,4g, tbox, etc.), recording types (voice, recording, etc.), warning tone types (navigation broadcasting, notification, etc.), media types (music, video, bluetooth music, radio, etc.). The priority is from high to low as telephone type > recording type > warning type > media type, the priority is high to preempt the focus with low priority, the peers are mutually exclusive, and the message processing result is fed back to the audio manager module 3, and the audio manager module 3 informs the application program 1 of releasing the focus, executing related playing operation, UI refreshing and other operations;
the MMS information delivery module 5 can forcibly separate and independently control the audio streams from the application 1 or the specific application 2, and the MMS information delivery module 5 forcibly separates the audio streams such as Android music and nitification, alarm, system, call at the frame layer so as to independently control the volume (AudioService).
The specific implementation of the mixing strategy and the voice switching rule of the MMS information transmission module 5 is as follows:
plan: the adopted sound mixing strategy
A: navigation broadcasting media sound pauses;
b: the navigation broadcasting media sound is mute;
c: navigation broadcasting media sound falling;
voice switching rules:
1. according to the plan selection how to process the mixing, level3 is a mixing object;
the smaller the level, the higher the priority, and the lower priority cannot switch the higher priority;
3. peer mutually exclusive switching;
level1 and 2 sounds or sounds before the start of sound back to 1 and 2 sounds at the end of recording;
5. when the current state is in level2, level1 starts, the recording of level2 is finished at the moment, and level2 is not recovered when level1 is finished;
6. bluetooth and voice notes have 2 levels of special treatment of sound;
beard and hair when Bluetooth is in external BT channel telephone
pkgName= "carnet application, blue. Phone"
Bluetooth music time beard and hair
pkgName= "carnet application, blue. Music"
Beard and hair during recording
pkgName= "carnet application, voicerec. Record"
Beard and hair during recording and playing
pkgName= "carnet application, voicerec. Play"
7. Bluetooth ring is equivalent to bluetooth fairy tale sound all sending pkgname= "carnet application.
8. When level3 is switched (for example, navigation broadcasting, short message prompting voice is coming), level3 is mixed at this time (navigation and short message prompting voice come out together)
The CPP audio detecting module 4 detects sound playing and ending operations from the special application 2 or an external audio channel and sends a processing message to the MMS information delivery module 5.
The MMS information transmission module 5 can also process voice synthesis TTS broadcast information; the voice synthesis TTS is typically sent by a voice process and notifies the MMS information delivery module 5 in a broadcast form, and the MMS information delivery module 5 converts the notification into a voice request, such as a weather report, a news report, etc.
The MMS information delivery module 5 synchronizes its own status by judging the status of the special sound: 1. detecting whether special sound states such as Bluetooth, ECALL, BCALL, ICALL and the like exist, and if so, processing logic such as a car body key, reversing and the like possibly needs to be processed; 2. sending a notification processing result broadcast to an upper layer, wherein the upper layer application of the application program 1 makes state adjustment and synchronization according to a broadcast protocol; 3. volume adjustments are made based on different sound conditions.
The above embodiment is only one of the preferred embodiments of the present invention, and the ordinary changes and substitutions made by those skilled in the art within the scope of the present invention should be included in the scope of the present invention.

Claims (7)

1. An audio management method applied to an android vehicle-mounted multimedia system is characterized by comprising the following steps:
the application program (1) sends out a focus application and release request through the audio manager module (3);
the CPP audio detection module (4) detects whether a special application program (2) or an external audio channel applies for focus information;
if the CPP audio detection module (4) identifies that the audio source of the application focus is a special application program (2) or an external audio channel, the CPP audio detection module (4) sends a message to the MMS information transmission module (5), and the special application program (2) is an upper-layer sound application which does not conform to the android system standard by a third party;
the audio manager module (3) realizes audio focus control through an audio focus control object, shields a primary sound stack management logic, converts a received focus request and focus release information, then sends the converted focus request and focus release information to the MMS information transmission module (5), and notifies an application through a primary interface after receiving a processing result of the MMS information transmission module (5);
the MMS information transmission module (5) feeds back a message processing result to the audio manager module (3), and the audio manager module (3) informs whether the application program (1) releases focus;
the MMS information transmission module (5) performs channel switching or audio control operation by transmitting a message to the micro control unit (6).
2. An audio management method applied to an android in-vehicle multimedia system according to claim 1, characterized in that the MMS information delivery module (5) can forcibly separate and independently control the audio streams from the application (1) or the special application (2).
3. An audio management method applied to an android in-vehicle multimedia system according to claim 1, wherein the MMS information transmission module (5) classifies priorities according to audio types from the application (1) or the special application (2), and the priority-high preemption is the focus with low priority, and the peers are mutually exclusive.
4. An audio management method applied to an android in-vehicle multimedia system according to claim 1, characterized in that the CPP audio detection module (4) detects sound play and end operations from the special application (2) or external audio channels and sends processing messages to the MMS information delivery module (5).
5. An audio management method applied to an android in-vehicle multimedia system in accordance with claim 1, characterized in that said MMS information delivery module (5) is further capable of processing speech synthesis TTS broadcast messages; the speech synthesis TTS informs the MMS messaging module (5) in broadcast form, and the MMS messaging module (5) converts the notification into a voice request.
6. An audio management method applied to an android in-vehicle multimedia system according to claim 1, characterized in that the audio manager module (3) captures different formats of audio stream actions from the application (1) with an audio track thread and a multimedia player thread, respectively.
7. An audio management method for an android in-vehicle multimedia system as claimed in claim 3, wherein the priority class comprises phone type, recording type, warning sound type and media type.
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CN111328061B (en) * 2020-02-28 2023-04-07 智达诚远科技有限公司 Audio resource control method, vehicle-mounted terminal and system
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CN114879931B (en) * 2022-07-11 2022-11-22 南京芯驰半导体科技有限公司 Onboard audio path management method and system supporting multiple operating systems

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