CN114416017A - Android-based audio focus implementation method - Google Patents
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Abstract
The invention discloses an Android-based audio focus implementation method, which comprises the steps of S1, injecting a self-defined external audio focus strategy on the basis of a default audio focus strategy provided by an Android system; s2, defining the rule of audio focus strategy as that the audio source can be accessed after getting focus; s3, defining the priority of the sound source type; s4, defining a combination type when two sound source types simultaneously apply for focuses; s5, applying for a sound source application focus; s6, when the sound source is applied to use the focus, the focus is released; and S7, automatically restoring the released focus to the current sound source according to the priority and the combination type of the current sound source, and returning the current sound source to obtain a focus notification and applying a sound source to release the focus success notification. The method solves the problems that the original strategy use scene of the Android system is single and the function is not comprehensive enough, and can completely self-define the realization of complex scenes including a sound mixing scene, mutual interruption, volume control under different scenes and the like according to the use scene of the Android system.
Description
Technical Field
The invention belongs to the technical field of computers, and particularly relates to an Android-based audio focus implementation method.
Background
In addition, Android is a multitask system, the Android system allows applications to compete for resources, such as audio, the Android system allows the applications to play audio and video simultaneously under the condition of sufficient resources, and the system can combine all audio streams in one channel. The Android system introduces the concept of "audio focus", and the application is allowed to play audio only when the focus is acquired.
The focus mechanism is a cooperation mode, and the Android system suggests that the application complies with an audio focus criterion, and the application can be played only when the application is applied to the focus. Therefore, playing an application without following the criteria is likely to result in a poor user experience.
Chinese patent CN202011566023.0 discloses an audio playing method, device, electronic device and storage medium for a vehicle, which includes: acquiring a playing mechanism of audio playing; generating an xml configuration file according to a playing mechanism; and analyzing the xml configuration file by using the callback function to generate a configuration strategy, modifying the audio playing strategy of the vehicle according to the configuration strategy, and playing at least one target audio according to the modified audio playing strategy. Therefore, the problem that the specific audio focus strategy style of the platform is realized by modifying the mediafocuscontrol. java file when the audio focus strategy is changed for different vehicle-mounted platforms in the related art is solved. The invention only provides the dynamic configuration strategy by using the xml, obtains the audio focus application result by using the external strategy, and only converts the mediafocuscontrol.java file which is modified each time into the xml file for execution, so that the application scene is single, the function is incomplete, and the personalized requirement of the user is difficult to meet.
Disclosure of Invention
In order to solve the problems, the invention provides an Android-based audio focus implementation method, which solves the problems that the original strategy use scene of an Android system is single and the function is not comprehensive enough, and can completely self-define the implementation of complex scenes including a sound mixing scene, mutual interruption, volume control under different scenes and the like according to the use scene of the Android system.
In order to solve the technical problem, the technical scheme adopted by the invention is as follows: an Android-based audio focus implementation method comprises the following steps,
s1, injecting a self-defined external audio focus strategy on the basis of a default audio focus strategy provided by an Android system, wherein the external audio focus strategy is used for completing application, release, maintenance and notification of a focus;
s2, defining the rule of audio focus strategy as that the audio source can be accessed after getting focus;
s3, defining the priority of the sound source type;
s4, defining a combination type when two sound source types simultaneously apply for focuses;
s5, applying for a sound source application focus; determining an application focus result of the application sound source according to the priority and the combination type of the application sound source and the current sound source, and if the application sound source applies to a focus, returning a successful application focus notification and executing the next step; otherwise, returning a failure notice of applying for the focus and stopping execution;
s6, when the sound source is applied to use the focus, the focus is released;
and S7, automatically restoring the released focus to the current sound source according to the priority and the combination type of the current sound source, and returning the current sound source to obtain a focus notification and applying a sound source to release the focus success notification.
As an optimization, the custom external focus policy registers external listening by the setaudiopolicyfocus Listener method in the audiopolicy Builder class and uses the custom external audio focus policy in the example audiopolicyfocus Listener callback.
As an optimization, the priority of the sound source type is, touch-tone > phone > voice assistant > navigation > media.
As optimization, the combination type includes mixing sound, stopping the current sound source, pausing the current sound source, refusing to apply for the sound source, mixing sound and reducing the volume of the current sound source or mixing sound and reducing the volume of the application sound source.
As optimization, the focuses are maintained and managed through stacks, and each focus is maintained and managed through one stack.
As an optimization, the applying for the sound source application focus comprises the following steps that a current sound source comprises a first current sound source and a second current sound source;
s501, an application sound source sends an application focus request;
s502, judging the priority of the application sound source and the priority of the first current sound source, determining the combination type and forming a first sound mixing logic;
s503, if the combination type is that the sound source application is refused, the sound source application focus fails;
s504, if the application sound source and the first current sound source are in the same priority, judging whether the first sound mixing logic is to stop the current sound source, if so, the first current sound source loses focus, and the application sound source applies for the focus successfully; otherwise, the first current sound source loses focus momentarily, and the sound source application succeeds in applying for the focus;
s505, if the combination type is other types, the priority of the applied sound source and the priority of the second current sound source are continuously judged, the combination type is determined, a second sound mixing logic is formed, and the next step is executed;
s506, if the combination type is that the application for the sound source is refused, whether the second current sound source has a focus or not is judged; if yes, the second current sound source loses focus, and the sound source application succeeds in applying for the focus; otherwise, returning to S504 to obtain a focus from the first current sound source by judging the first sound mixing logic;
s507, if the combination type is sound mixing and the current sound source volume is reduced or the sound mixing and the applied sound source volume is reduced, whether a second current sound source has a focus is judged, and if yes, the combination type of the first sound mixing logic is judged to obtain the focus from the first current sound source or directly obtain the focus; otherwise the second current source acquires the focus.
As an optimization, the releasing the focus comprises the steps of,
s601, sending a focus releasing request after the sound source application finishes using the focus;
s602, judging the priority of the first current sound source and the priority of the second current sound source, determining the combination type and forming a third sound mixing logic;
s603, if the combination type of the third sound mixing logic is that the application of the sound source is refused or the first current sound source and the second current sound source are in the same priority, judging whether the second current sound source has a focus, if so, the second current sound source loses the focus, and the first current sound source obtains the focus; otherwise, the first current sound source obtains a focus;
s604, if the combination type of the third sound mixing logic is sound mixing and the volume of the current sound source is reduced or sound mixing and the volume of the applied sound source is reduced, whether the second current sound source has a focus or not is judged, and if yes, the first current sound source obtains the focus; otherwise, the second current sound source obtains a focus;
and S605, sending a successful notification of applying for releasing the focus of the sound source after the first current sound source obtains the focus.
Compared with the prior art, the invention has the following advantages:
according to the method, besides a default audio strategy, a registration mode is provided to inject an external audio focus strategy in the Android system; the self-defined AudioPolicy focus strategy registers external monitoring through a setAudioPolicyFocusLister method in an AudioPolicy. Builder class, and the self-defined audio focus strategy is used in an example AudioPolicyFocusLister callback; and completing application, release maintenance and notification of different application focuses in a user-defined audio focus strategy.
The method is highly platformized, and the management of focuses among different applications in different scenes can be realized only by modifying one configuration of the xml file when the xml file is transplanted to other projects; the problems that the Android native system has few coverage scenes and cannot realize coverage of complex scenes are solved; the volume reduction is completely changed from the application of self control to system control in the prior art, so that the volume reduction becomes flexible and controllable; the single application can be applied to different types of focuses while conforming to the sound mixing scene; several audio types are added, making the coverage wider.
In conclusion, the user-defined audio focus strategy solves the problem that many scenes can not be covered by the Android native system, the system focus maintenance becomes simpler and more flexible, and the management and maintenance of the audio focus can be quickly realized.
Drawings
FIG. 1 is a schematic diagram of a process of applying a focus of the present invention;
FIG. 2 is a schematic diagram of a focus release process according to the present invention;
FIG. 3 is a timing diagram of a scenario in an embodiment of the present invention;
FIG. 4 is a timing diagram illustrating a second scenario in an embodiment of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings and the embodiments.
Example (b): with reference to figures 1-4 of the drawings,
an Android-based audio focus implementation method comprises the following steps,
and S1, injecting a self-defined external audio focus strategy on the basis of the default audio focus strategy provided by the Android system, wherein the external audio focus strategy is used for completing application, release, maintenance and notification of a focus. The custom external focus policy registers external listening by the setaudiopolicyfocus listener method in the audiopolicy. And maintaining and managing the focuses through stacks, wherein each focus is provided with one stack for maintaining and managing.
And S2, defining the rule of the audio focus strategy that the audio source can be accessed after obtaining the focus.
And S3, defining the priority of the sound source type. The priority of the audio source type is, touch-tone > phone > voice assistant > navigation > media.
S4, defining a combination type when two sound source types simultaneously apply for focuses; the combination type includes mixing (same), stopping the current sound source (sotp), pausing the current sound source (pause), rejecting the application sound source (reject), mixing and lowering the current sound source volume (mix _ dump 2), or mixing and lowering the application sound source volume (mix _ dump 1).
S5, applying for a sound source application focus; determining an application focus result of the application sound source according to the priority and the combination type of the application sound source and the current sound source, and if the application sound source applies to a focus, returning a successful application focus notification and executing the next step; otherwise, returning a failure notice of applying for the focus and stopping execution;
the application of the sound source (sound source A) for the focus comprises the following steps that the current sound source comprises a first current sound source (sound source B) and a second current sound source (sound source C);
s501, an application sound source sends an application focus request;
s502, judging the priority of the application sound source and the priority of the first current sound source, determining the combination type and forming a first sound mixing logic;
s503, if the combination type is that the sound source application is refused, the sound source application focus fails;
s504, if the application sound source and the first current sound source are in the same priority, judging whether the first sound mixing logic is to stop the current sound source, if so, the first current sound source loses focus, and the application sound source applies for the focus successfully; otherwise, the first current sound source loses focus momentarily, and the sound source application succeeds in applying for the focus;
s505, if the combination type is other types, the priority of the applied sound source and the priority of the second current sound source are continuously judged, the combination type is determined, a second sound mixing logic is formed, and the next step is executed;
s506, if the combination type is that the application for the sound source is refused, whether the second current sound source has a focus or not is judged; if yes, the second current sound source loses focus, and the sound source application succeeds in applying for the focus; otherwise, returning to S504 to obtain a focus from the first current sound source by judging the first sound mixing logic;
s507, if the combination type is sound mixing and the current sound source volume is reduced or the sound mixing and the applied sound source volume is reduced, whether a second current sound source has a focus is judged, and if yes, the combination type of the first sound mixing logic is judged to obtain the focus from the first current sound source or directly obtain the focus; otherwise the second current source acquires the focus.
S6, when the sound source is applied to use the focus, the focus is released.
Said releasing the focus comprises the step of,
s601, sending a focus releasing request after the sound source application finishes using the focus;
s602, judging the priority of the first current sound source and the priority of the second current sound source, determining the combination type and forming a third sound mixing logic;
s603, if the combination type of the third sound mixing logic is that the application of the sound source is refused or the first current sound source and the second current sound source are in the same priority, judging whether the second current sound source has a focus, if so, the second current sound source loses the focus, and the first current sound source obtains the focus; otherwise, the first current sound source obtains a focus;
s604, if the combination type of the third sound mixing logic is sound mixing and the volume of the current sound source is reduced or sound mixing and the volume of the applied sound source is reduced, whether the second current sound source has a focus or not is judged, and if yes, the first current sound source obtains the focus; otherwise, the second current sound source obtains a focus;
and S605, sending a successful notification of applying for releasing the focus of the sound source after the first current sound source obtains the focus.
And S7, automatically restoring the released focus to the current sound source according to the priority and the combination type of the current sound source, and returning the current sound source to obtain a focus notification and applying a sound source to release the focus success notification.
Specifically, the invention provides a registration mode to inject an external Audio focus strategy based on the Android system in addition to a default Audio strategy, and the self-defined Audio focus strategy is used in the example Audio focus listener callback by the setaudiopolicyfocursenerer method.
The method comprises the steps of completing application, release maintenance and notification of different application focuses in a custom audio focus strategy, defining sound sources into a plurality of categories, defining attributes such as level, bus number, sound mixing volume processing logic and the like for each category according to priority, and defining a plurality of combination conditions (only sound mixing, stopping the current sound source, pausing the current sound source, refusing to apply for the source, reducing the volume of the current source or applying for the source) which can be formed when two groups of sound source types simultaneously apply for the focuses;
through management of stack maintenance application focuses, one stack is maintained at each level focus, when the focus is applied, the type of the focus held by the current system is inquired firstly, whether the focus can be applied by an application source is matched according to the type, and a corresponding result is given to serve as a focus result notification, as shown in fig. 1.
The processing of this by the audio source stack when the application releases the focus is shown in fig. 2.
After the implementation according to the above scheme, a flexible and changeable Android system audio focus strategy can be obtained, based on the current audio strategy used by the vehicle machine and the management method of the Android system focus, a common scene is used for explanation:
scene one: during the multimedia playing process, the TTS voice assistant or the telephone is interrupted, and after the TTS voice assistant or the telephone is finished, the multimedia is resumed to be played, as shown in fig. 3
A1. The application A applies for a multimedia focus to play multimedia according to the Android native API;
A2. after application B applies for focus with the help of phone or TTS language, application a will receive notification of audiomanager, audioswitch _ LOSS _ TRANSIENT (short lost focus) because the phone or speech help priority is higher than media;
A3. applying a short loss of focus a should pause the play and record the passive lost focus pause;
A4. applying the telephone B or the voice help focus to apply for success, and starting playing or talking;
A5. applying a B-phone or voice-assisted end focus release;
A6. the system returns the focus to application a, receives the notification of audiomanager.
In this example, based on the common focus priority defined by the technical solution: the key tone, the telephone focus, the language aided focus, the navigation and the media are combined, when the focus is held for the media, the TTS or TEL breaks the media focus and only causes the media to lose the focus for a short time, so the focus is released when the TTS or TEL finishes, the system focus can automatically recover the media application played before, the strategy control is changed by applying the focus type to control whether the focus can return to the application, and the difficulty of the application to use the API is reduced.
Scene two: the media is navigated to apply for focus during playback, as shown in FIG. 4
A1. Applying for a media focus by an application A;
A2. the focus management judges that no other application holds the focus at present, and informs the application A that the focus application is successful;
A3. the application A receives the successful callback of the focus application and starts to play music;
A4. opening navigation to start navigation broadcasting and applying a focus for navigation;
A5. navigating and playing the same level of voice according to the focus strategy and needing sound mixing, so that the focus application is fed back to successfully notify the navigation app at the moment, and the multimedia volume is reduced according to the sound mixing strategy;
A6. the navigation receives a focus application success call-back event and starts broadcasting; at this time, mixing with voice;
A7. after the navigation broadcasting is finished, releasing a focus, and enabling the volume of the multimedia application A to be recovered to be normal;
the media defined by the current audio strategy can be subjected to interval voice reduction in navigation, and the system can perform voice reduction processing according to different interval segment values of the current volume of the media, so that the system is more flexible and changeable.
In the embodiment, the navigation and the media are mixed sound scenes, so that the application of another focus can obtain the result of successful application no matter the currently focused media or navigation is held, the sound reduction processing is processed by the system instead of the previous application processing, the inconsistency of different application processing modes is caused, and the experience of a user is not good
According to the method, besides a default audio strategy, a registration mode is provided to inject an external audio focus strategy in the Android system; the self-defined AudioPolicy focus strategy registers external monitoring through a setAudioPolicyFocusLister method in an AudioPolicy. Builder class, and the self-defined audio focus strategy is used in an example AudioPolicyFocusLister callback; and completing application, release maintenance and notification of different application focuses in a user-defined audio focus strategy.
The method is highly platformized, and the management of focuses among different applications in different scenes can be realized only by modifying one configuration of the xml file when the xml file is transplanted to other projects; the problems that the Android native system has few coverage scenes and cannot realize coverage of complex scenes are solved; the volume reduction is completely changed from the application of self control to system control in the prior art, so that the volume reduction becomes flexible and controllable; the single application can be applied to different types of focuses while conforming to the sound mixing scene; several audio types are added, making the coverage wider.
In conclusion, the user-defined audio focus strategy solves the problem that Android originally has many scenes which cannot be covered, the system focus maintenance becomes simpler and more flexible, and the management and maintenance of the audio focus can be quickly realized.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and those skilled in the art should understand that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all that should be covered by the claims of the present invention.
Claims (7)
1. An Android-based audio focus realization method is characterized by comprising the following steps,
s1, injecting a self-defined external audio focus strategy on the basis of a default audio focus strategy provided by an Android system, wherein the external audio focus strategy is used for completing application, release, maintenance and notification of a focus;
s2, defining the rule of audio focus strategy as that the audio source can be accessed after getting focus;
s3, defining the priority of the sound source type;
s4, defining a combination type when two sound source types simultaneously apply for focuses;
s5, applying for a sound source application focus; determining an application focus result of the application sound source according to the priority and the combination type of the application sound source and the current sound source, and if the application sound source applies to a focus, returning a successful application focus notification and executing the next step; otherwise, returning a failure notice of applying for the focus and stopping execution;
s6, when the sound source is applied to use the focus, the focus is released;
and S7, automatically restoring the released focus to the current sound source according to the priority and the combination type of the current sound source, and returning the current sound source to obtain a focus notification and applying a sound source to release the focus success notification.
2. The Android-based audio focus implementation method of claim 1, wherein the customized external focus policy registers external listening through setaudiopolicyfocus Lister method in audiopolicy.
3. The Android-based audio focus implementation method of claim 1, wherein the priority of the sound source type is, touch-tone > telephone > voice assistant > navigation > media.
4. The Android-based audio focus implementation method of claim 1, wherein the combination types include mixing, stopping the current sound source, pausing the current sound source, refusing to apply for the sound source, mixing and reducing the volume of the current sound source or mixing and reducing the volume of the application sound source.
5. The Android-based audio focus implementation method of claim 1, wherein the focuses are maintained and managed through stacks, and each focus has one stack for maintenance and management.
6. The Android-based audio focus realization method of claim 1, wherein the applying for an audio source application focus comprises the steps of, wherein a current audio source comprises a first current audio source and a second current audio source;
s501, an application sound source sends an application focus request;
s502, judging the priority of the application sound source and the priority of the first current sound source, determining the combination type and forming a first sound mixing logic;
s503, if the combination type is that the sound source application is refused, the sound source application focus fails;
s504, if the application sound source and the first current sound source are in the same priority, judging whether the first sound mixing logic is to stop the current sound source, if so, the first current sound source loses focus, and the application sound source applies for the focus successfully; otherwise, the first current sound source loses focus momentarily, and the sound source application succeeds in applying for the focus;
s505, if the combination type is other types, the priority of the applied sound source and the priority of the second current sound source are continuously judged, the combination type is determined, a second sound mixing logic is formed, and the next step is executed;
s506, if the combination type is that the application for the sound source is refused, whether the second current sound source has a focus or not is judged; if yes, the second current sound source loses focus, and the sound source application succeeds in applying for the focus; otherwise, returning to S504 to obtain a focus from the first current sound source by judging the first sound mixing logic;
s507, if the combination type is sound mixing and the current sound source volume is reduced or the sound mixing and the applied sound source volume is reduced, whether a second current sound source has a focus is judged, and if yes, the combination type of the first sound mixing logic is judged to obtain the focus from the first current sound source or directly obtain the focus; otherwise the second current source acquires the focus.
7. The Android-based audio focus implementation method of claim 6, wherein the releasing of the focus comprises the following steps,
s601, sending a focus releasing request after the sound source application finishes using the focus;
s602, judging the priority of the first current sound source and the priority of the second current sound source, determining the combination type and forming a third sound mixing logic;
s603, if the combination type of the third sound mixing logic is that the application of the sound source is refused or the first current sound source and the second current sound source are in the same priority, judging whether the second current sound source has a focus, if so, the second current sound source loses the focus, and the first current sound source obtains the focus; otherwise, the first current sound source obtains a focus;
s604, if the combination type of the third sound mixing logic is sound mixing and the volume of the current sound source is reduced or sound mixing and the volume of the applied sound source is reduced, whether the second current sound source has a focus or not is judged, and if yes, the first current sound source obtains the focus; otherwise, the second current sound source obtains a focus;
and S605, sending a successful notification of applying for releasing the focus of the sound source after the first current sound source obtains the focus.
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