CN113282271A - Audio processing method and device for android application on Linux platform - Google Patents
Audio processing method and device for android application on Linux platform Download PDFInfo
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- CN113282271A CN113282271A CN202110827953.5A CN202110827953A CN113282271A CN 113282271 A CN113282271 A CN 113282271A CN 202110827953 A CN202110827953 A CN 202110827953A CN 113282271 A CN113282271 A CN 113282271A
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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
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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
- G06F3/165—Management of the audio stream, e.g. setting of volume, audio stream path
Abstract
The invention discloses an audio processing method and device for Android application on a Linux platform, which are characterized in that the operation of a user on the Android application is obtained on a HAL layer of an Android running environment, the Android application is directly called for audio equipment of the Linux platform through reading and writing an audio data interface file, the audio service of the Linux platform is not needed, the time delay of the audio processing of the Android application on a desktop platform is effectively reduced, the timeliness of the audio processing is improved, and the user experience is remarkably improved.
Description
Technical Field
The invention belongs to the technical field of development of running mobile applications on a desktop operating system, and particularly relates to an audio processing method and device of android applications on a Linux platform.
Background
Android (Android) applications are run on a Linux platform, a mode of installing an Android running environment on the Linux platform is generally adopted, and the Android running environment has very important significance for enriching the application ecology of an operating system.
Existing Linux platforms typically employ PulseAudio as a sound processing architecture to uniformly process audio from different applications. PulseAudio is an audio service widely used in desktop environments such as GNOME or KDE, which acts as a proxy between kernel audio components and applications. Typically, the kernel audio component includes two structures, an ALSA (advanced Linux Sound architecture) and an OSS (open Sound System). The PulseAudio is composed of a Server (Server) and a plurality of clients (clients) based on a C/S structure, wherein the clients are adapters of application programs used as sound sources, the Server is responsible for inputting and mixing audio of the clients and outputting the audio to audio equipment, and the clients and the Server are communicated through Pipe files. In a typical audio processing scheme for the Linux platform, a user needs to configure the ALSA to use the virtual device provided by PulseAudio.
At present, an audio architecture of an Android system mainly includes an application layer, a basic architecture layer, a support library layer, and a hardware driver layer. The application layer is the uppermost layer of the whole audio system and mainly comprises applications such as a music player and game software; the basic architecture Layer mainly comprises an AudioManager, an audioFlinger and an audioHAL, wherein the audioHAL (Audio Hardware Abstraction Layer) is used as an Audio equipment Abstraction Layer and is used as a 'separation board' applied between bottom Layer Hardware, so that the compatibility between upper Layer application and the bottom Layer Hardware is ensured, and the Audio Hardware Abstraction Layer is an object directly accessed by the audioFlinger; the supporting library layer is a library file layer required by the basic framework layer; the hardware driving layer is a driving program layer of the sound card.
The audio architecture is also an audio architecture adopted by an Android running environment in the prior art, but the architecture cannot be compatible with an audio architecture adopted by a Linux platform, so that Android applications in the Android running environment cannot use audio equipment of the Linux system to output sound, inconvenience is brought to user operation, and user experience is reduced.
Disclosure of Invention
In view of this, the present invention provides an audio processing method and apparatus for an Android application on a Linux platform, which enable the Android application running in an Android running environment to directly output audio by using an audio device of the Linux platform.
The invention provides an audio processing method for android application on a Linux platform, which specifically comprises the following steps:
running an Android running environment in a container of a Linux platform, wherein an Android application runs in the Android running environment; the Linux platform is provided with an audio equipment control unit for controlling audio equipment; acquiring the operation of a user on the Android application on an HAL layer of the Android running environment, and forming a control instruction according to the operation;
selecting audio equipment A of the Linux platform required to be used by a user; setting that the Android operating environment has read-write permission for the audio data interface file of the audio equipment A;
when the control instruction is an output instruction, writing the control instruction and the audio data A of the Android application into the audio data interface file; the audio equipment control unit reads the audio data interface file to obtain the control instruction and audio data A, and outputs the audio data A to the audio equipment A;
when the control instruction is an input instruction, writing the control instruction into the audio data interface file; the audio equipment control unit reads the audio data interface file to obtain the control instruction, and writes the audio data B acquired by the audio equipment A into the audio data interface file; reading the audio data interface file to obtain the audio data B, and sending the audio data B to the Android application;
when the control instruction is a configuration instruction, writing the control instruction and the configuration parameters into the audio data interface file; and the audio equipment control unit reads and analyzes the audio data interface file to obtain the control instruction and the configuration parameters, and completes the configuration of the audio equipment A according to the configuration parameters.
Further, in the HAL layer of the Android operating environment, the Android ASdevice is realized by using an ALSA audio architecture API of the Linux platform;
the Android ASdevice is used for acquiring the operation of a user on the Android application to form the control instruction;
when the control instruction is an output instruction, the Android ASdevice writes the control instruction and the audio data A into the audio data interface file;
when the control instruction is an input instruction, the Android ASdevice writes the control instruction into the audio data interface file, and reads the audio data interface file to obtain the audio data B;
and when the control instruction is a configuration instruction, the Android ASdevice writes the control instruction and the configuration parameters into the audio data interface file.
Further, the configuration parameters include channels, sampling frequency of input stream.
The invention provides an audio processing device for Android application on a Linux platform, which comprises an Android running environment, an audio equipment selection unit, a virtual audio client and an audio equipment control unit, wherein the Android running environment is a virtual environment;
the Android running environment runs in an Android container on a Linux platform, and is used for providing a running environment for Android applications;
the audio equipment selection unit is positioned on the Linux platform and used for determining selected hardware audio equipment according to the user requirements; setting the Android operating environment to have read-write permission for the audio data interface file of the selected hardware audio equipment;
the virtual audio client is positioned in a hardware abstraction layer HAL of the Android running environment and used for acquiring the operation of a user on the Android application and forming a control instruction according to the operation; the virtual audio client is used for writing control information and audio data into the audio data interface file according to the control instruction and reading the audio data from the audio data interface file;
the audio equipment control unit is positioned on the Linux platform and used for controlling the audio equipment of the Linux platform; and the audio equipment control unit processes the audio equipment according to the control instruction acquired from the audio data interface file and writes the acquired audio data into the audio data interface file.
Further, the control instructions include output instructions, input instructions, and configuration instructions.
Further, the virtual audio client implements the ALSA audio architecture API, including: the audio playing interface is used for writing the audio data of the Android application into the audio data interface file according to the output instruction; the audio input interface is used for reading in audio data from the audio data interface file according to the input instruction; and the configuration interface is used for writing the configuration instruction and the configuration parameters into the audio data interface file.
Has the advantages that:
1. according to the method and the device, the operation of the user on the Android application is obtained on the HAL layer of the Android running environment, the Android application is directly called on the audio equipment of the Linux platform through reading and writing the audio data interface file, the audio service of the Linux platform is not needed, the time delay of the audio processing of the Android application on the desktop platform is effectively reduced, the timeliness of the audio processing is improved, and the user experience is remarkably improved.
2. According to the audio equipment Android ASdevice based on the ALSA architecture design, the Android HAL layer of the Android in the Android running environment realizes the Android ASdevice of the audio equipment, so that the Android application running in the Android running environment can directly use the audio equipment of the Linux platform, the development amount of software codes is effectively reduced based on the Linux platform architecture design, and meanwhile, the use smoothness is effectively improved.
Drawings
Fig. 1 is an architecture diagram of an audio processing method for an android application on a Linux platform according to the present invention.
Fig. 2 is a structural diagram of an audio processing apparatus for an android application on a Linux platform according to the present invention.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The invention provides an audio processing method and device for android application on a Linux platform, and the core idea of the audio processing method and device is as follows: and realizing the Android audio equipment on an HAL layer of an Android system by using an ALSA audio architecture API (application programming interface), so that the audio equipment of a Linux platform can be directly used by the Android application running in an Android running environment.
The invention provides an audio processing method of android application on a Linux platform, which is configured as shown in figure 1 and comprises the following steps:
In an HAL layer of an Android operating environment, an ALSA audio architecture API of a Linux platform is used for realizing an Android ASdevice;
the Android ASdevice is used for acquiring the operation of the user on the Android application to form a control instruction;
when the control instruction is an output instruction, the Android ASdevice writes the control instruction and the audio data A into an audio data interface file;
when the control instruction is an input instruction, the Android ASdevice writes the control instruction into an audio data interface file and reads the audio data interface file to obtain audio data B;
and when the control instruction is a configuration instruction, the Android ASdevice writes the control instruction and the configuration parameters into the audio data interface file.
Step 2, the user selects the audio equipment A of the Linux platform to be used; setting that the Android operating environment has read-write permission to an audio data interface file of the audio equipment A;
step 3, judging the type of the current control instruction, and if the control instruction is an output instruction, executing step 4; if the control instruction is an input instruction, executing the step 5; if the control command is a configuration command, step 6 is executed.
Step 4, writing the control instruction and the audio data A of the Android application into an audio data interface file; the audio equipment control unit reads the audio data interface file to obtain a control instruction and audio data A, and outputs the audio data A to the audio equipment A.
Step 5, writing the control instruction into an audio data interface file; the audio equipment control unit reads the audio data interface file to obtain a control instruction, and writes the audio data B acquired by the audio equipment A into the audio data interface file; and reading the audio data interface file to obtain audio data B, and sending the audio data B to the Android application.
Step 6, writing the control instruction and the configuration parameters into an audio data interface file; the audio equipment control unit reads and analyzes the audio data interface file to obtain a control instruction and configuration parameters, and completes the configuration of the audio equipment A according to the configuration parameters.
Typically, the configuration parameters include the channel, the sampling frequency of the input stream.
The invention provides an audio processing device for Android application on a Linux platform.
The Android operation environment runs in an Android container on the Linux platform, and is used for providing an operation environment for Android applications.
The audio equipment selection unit is positioned on the Linux platform and used for determining selected hardware audio equipment according to the user requirements; and setting that the Android operating environment has read-write permission to the audio data interface file of the selected hardware audio equipment.
The virtual audio client is positioned in a hardware abstraction layer HAL of an Android running environment and used for acquiring the operation of a user on the Android application and forming a control instruction according to the operation; the virtual audio client is used for writing the control information and the audio data into the audio data interface file according to the control instruction and reading the audio data from the audio data interface file. The control instructions include output instructions, input instructions, and configuration instructions.
The audio equipment control unit is positioned on the Linux platform and used for controlling the audio equipment of the Linux platform; the audio device control unit processes the audio device according to the control instruction acquired from the audio data interface file, and writes the acquired audio data into the audio data interface file.
The virtual audio client implements the ALSA audio architecture API, including: the audio playing interface is used for writing the audio data of the Android application into an audio data interface file according to the output instruction; the audio input interface is used for reading in audio data from the audio data interface file according to an input instruction; and the configuration interface is used for writing the configuration instruction and the configuration parameters into the audio data interface file.
Example (b):
the audio processing method for the android application on the Linux platform provided by the embodiment of the invention realizes that the android application on the Linux platform completes the processing of audio data by adopting the audio equipment of the Linux platform, and the specific process is as follows:
s1, selecting the audio equipment on the Linux platform according to the requirement, and modifying the access authority of the file corresponding to the audio equipment selected in the "/dev/snd" directory of the file system on the Linux platform, so that the application running in the Android running environment can access the file.
On the Linux platform, the device file created by the driver is stored in the "/dev/snd" directory of the file system, and the file in the directory is not allowed to be accessed by the ordinary user under the normal condition. The Android operating environment is equivalent to a common user of a Linux system, so the Android operating environment does not have access authority for accessing the "/dev/snd" directory under the default condition. In order to realize the access of the Android application to the file, the following operations need to be executed:
s1.1, acquiring all sound cards and digital audio equipment of the Linux platform by adopting commands of 'arecord-l' or 'overlay-l' and the like of the Linux platform, selecting adopted audio equipment from the listed sound cards and digital audio equipment according to actual needs, and acquiring card and device numbers of the audio equipment.
S1.2, in a Linux platform file system directory '/dev/snd', modifying the access authority of the file corresponding to the audio equipment selected in the step 1.1.
And S2, in an Android operation environment, adopting an API (application programming interface) provided by an ALSA (application virtualization architecture) audio architecture to realize Android audio equipment in an HAL (hardware-in-the-loop) layer of Android, wherein the equipment is named as Android ASdevice.
In the invention, the Android running environment adopts the Audio HAL audio equipment abstraction layer to realize the encapsulation of different types of audio equipment, so if the application in the Android running environment can directly access the hardware of the Linux platform by adopting the ALSA architecture, the audio equipment of the Android needs to be realized by using the ALSA API on the Android HAL layer, and the audio equipment is named as Android ASdevice.
The HAL layer of the Android system mainly adopts the following structural bodies to describe hardware equipment: hw _ module _ t, hw _ module _ methods _ t, and hw _ device _ t. The hw _ module _ t structure is used for describing hardware objects, an open method is defined in the hw _ module _ t structure, operation interfaces of the hardware objects can be obtained by calling the open method, and indirect operation on hardware equipment can be achieved by adopting the operation interfaces. The hw _ module _ methods _ t structural body encapsulates the open method, and the hw _ device _ t structural body encapsulates the operation interface of the hardware equipment.
In the invention, the Android ASdevice of the audio equipment is realized by inheriting the hw _ module _ t and extending the new attribute. For example, an audio _ module structure is adopted as a new hardware object, the audio _ module structure inherits the hw _ module _ t structure, and the definition of the audio _ module structure is as follows:
struct audio_module {
struct hw_module_t common;
definition };/definition
struct audio_module HAL_MODULE_INFO_SYM = {
.common = {
.tag = HARDWARE_MODULE_TAG,
.module_api_version = AUDIO_MODULE_API_VERSION_0_1,
.hal_api_version = HARDWARE_HAL_API_VERSION,
.id = AUDIO_HARDWARE_MODULE_ID,
…
},
};
The open method of the hardware object hw _ module _ t describes a structure (i.e. methods members in the above structure), and only encapsulates one element, i.e. the open function pointer. And the open function pointer is used for opening the hardware equipment and returning to operate the operation interface corresponding to the hardware equipment. In the present invention, the structure of the methods members is defined as follows:
static struct hw_module_methods_t hal_module_methods =
{
.open = audiod_open,
};
wherein, the audio _ open function provides the function of opening the Android ASDevice audio equipment and provides the operation interface of the Android ASDevice, and comprises: audio _ close, audio _ init _ check, audio _ set _ voice _ volume, audio _ set _ master _ volume, audio _ set _ mode, audio _ set _ mic _ multicast, audio _ get _ input _ buffer _ size, audio _ open _ output _ stream, audio _ close _ output _ stream, audio _ open _ input _ stream, and audio _ close _ input _ stream. The audio _ open function is defined as follows:
static int audiod_open(const hw_module_t* module, const char* name,
hw_device_t** device)
{
struct audio_device *audiod;
int ret;
…
audiod->hw_device.common.tag = HARDWARE_DEVICE_TAG;
audiod->hw_device.common.version = AUDIO_DEVICE_API_VERSION_2_0;
audiod->hw_device.common.module = (struct hw_module_t *) module;
audiod->hw_device.common.close = audiod_close;
audiod->hw_device.init_check = audiod_init_check;
audiod->hw_device.set_voice_volume = audiod_set_voice_volume;
audiod->hw_device.set_master_volume = audiod_set_master_volume;
audiod->hw_device.set_mode = audiod_set_mode;
audiod->hw_device.set_mic_mute = audiod_set_mic_mute;
audiod->hw_device.get_mic_mute = audiod_get_mic_mute;
audiod->hw_device.set_parameters = audiod_set_parameters;
audiod->hw_device.get_parameters = audiod_get_parameters;
audiod->hw_device.get_input_buffer_size = audiod_get_input_buffer_size;
audiod->hw_device.open_output_stream = audiod_open_output_stream;
audiod->hw_device.close_output_stream = audiod_close_output_stream;
audiod->hw_device.open_input_stream = audiod_open_input_stream;
audiod->hw_device.close_input_stream = audiod_close_input_stream;
audiod->hw_device.dump = audiod_dump;
//audiod->ar = audio_route_init();
audiod->orientation = ORIENTATION_UNDEFINED;
audiod->out_device = AUDIO_DEVICE_OUT_SPEAKER;
audiod->in_device = AUDIO_DEVICE_IN_BUILTIN_MIC & ~AUDIO_DEVICE_BIT_IN;
…
}
…
}
the audio _ open _ input _ stream function realizes the reading function from the audio equipment of the Linux platform by calling the pcm _ open and the pcm _ read functions in the ALSA API, calls the pcm _ close function in the ALSA API to close the current equipment when the audio equipment is abnormal, and simultaneously obtains or sets the sampling frequency of the sound card, the channel and the input stream. and the audio _ close _ input _ stream function closes the current audio equipment by calling the pcm _ close function in the ALSA API. and the audio _ open _ output _ stream function realizes the write operation to the audio device by calling the pcm _ open function and the pcm _ write function in the ALSA API, and closes the current audio device by calling the pcm _ close function in the ALSA API when the audio device is abnormal. The audio _ close _ output _ stream function implements closing of the current audio device by calling the pcm _ close function in the ALSA API. Therefore, the Android audio equipment Android ASdevice is realized on the basis of the ALSA API in the HAL layer of the Android.
In the Android system, the compilation of the Android ASDevice audio equipment is completed.
And S3, starting an Android running environment, taking the audio of the Android application as input, writing the input audio into the audio equipment of the Linux platform through the Android ASdevice, or reading the audio obtained by the audio equipment of the Linux platform into the corresponding Android application, so that the audio equipment of the Linux platform can be directly used by the Android application.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. An audio processing method for android application on a Linux platform is characterized by comprising the following steps:
running an Android running environment in a container of a Linux platform, wherein an Android application runs in the Android running environment; the Linux platform is provided with an audio equipment control unit for controlling audio equipment; acquiring the operation of a user on the Android application on an HAL layer of the Android running environment, and forming a control instruction according to the operation;
selecting audio equipment A of the Linux platform required to be used by a user; setting that the Android operating environment has read-write permission for the audio data interface file of the audio equipment A;
when the control instruction is an output instruction, writing the control instruction and the audio data A of the Android application into the audio data interface file; the audio equipment control unit reads the audio data interface file to obtain the control instruction and audio data A, and outputs the audio data A to the audio equipment A;
when the control instruction is an input instruction, writing the control instruction into the audio data interface file; the audio equipment control unit reads the audio data interface file to obtain the control instruction, and writes the audio data B acquired by the audio equipment A into the audio data interface file; reading the audio data interface file to obtain the audio data B, and sending the audio data B to the Android application;
when the control instruction is a configuration instruction, writing the control instruction and the configuration parameters into the audio data interface file; and the audio equipment control unit reads and analyzes the audio data interface file to obtain the control instruction and the configuration parameters, and completes the configuration of the audio equipment A according to the configuration parameters.
2. The audio processing method according to claim 1, wherein in the HAL layer of the Android operating environment, an ALSA audio architecture API of the Linux platform is used to implement an Android ASDevice;
the Android ASdevice is used for acquiring the operation of a user on the Android application to form the control instruction;
when the control instruction is an output instruction, the Android ASdevice writes the control instruction and the audio data A into the audio data interface file;
when the control instruction is an input instruction, the Android ASdevice writes the control instruction into the audio data interface file, and reads the audio data interface file to obtain the audio data B;
and when the control instruction is a configuration instruction, the Android ASdevice writes the control instruction and the configuration parameters into the audio data interface file.
3. The audio processing method according to claim 1 or 2, wherein the configuration parameters comprise channels, sampling frequency of input stream.
4. An audio processing device for Android application on a Linux platform is characterized by comprising an Android running environment, an audio equipment selection unit, a virtual audio client and an audio equipment control unit;
the Android running environment runs in an Android container on a Linux platform, and is used for providing a running environment for Android applications;
the audio equipment selection unit is positioned on the Linux platform and used for determining selected hardware audio equipment according to the user requirements; setting the Android operating environment to have read-write permission for the audio data interface file of the selected hardware audio equipment;
the virtual audio client is positioned in a hardware abstraction layer HAL of the Android running environment and used for acquiring the operation of a user on the Android application and forming a control instruction according to the operation; the virtual audio client is used for writing control information and audio data into the audio data interface file according to the control instruction and reading the audio data from the audio data interface file;
the audio equipment control unit is positioned on the Linux platform and used for controlling the audio equipment of the Linux platform; and the audio equipment control unit processes the audio equipment according to the control instruction acquired from the audio data interface file and writes the acquired audio data into the audio data interface file.
5. The audio processing apparatus according to claim 4, wherein the control instructions comprise output instructions, input instructions, and configuration instructions.
6. The audio processing apparatus according to claim 5, wherein the virtual audio client implements an ALSA audio architecture API comprising: the audio playing interface is used for writing the audio data of the Android application into the audio data interface file according to the output instruction; the audio input interface is used for reading in audio data from the audio data interface file according to the input instruction; and the configuration interface is used for writing the configuration instruction and the configuration parameters into the audio data interface file.
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