CN112422832A - Image data transmission method, mobile terminal and storage medium - Google Patents
Image data transmission method, mobile terminal and storage medium Download PDFInfo
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- CN112422832A CN112422832A CN202011311643.XA CN202011311643A CN112422832A CN 112422832 A CN112422832 A CN 112422832A CN 202011311643 A CN202011311643 A CN 202011311643A CN 112422832 A CN112422832 A CN 112422832A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/80—Camera processing pipelines; Components thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/42—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation
- H04N19/423—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation characterised by memory arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
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Abstract
A transmission method of image data, a mobile terminal and a storage medium, the method comprising: receiving and caching image data acquired by a camera module through a first data path, wherein the first data path is connected with the cache module and the camera module; and transmitting the cached image data to a display module through a second data path, wherein the second data path connects the cache module and the display module. According to the scheme of the invention, the image data can be obtained without additionally adding a data stream to the image pickup APP, so that the system bandwidth, the memory consumption and the power consumption are reduced, and the data processing amount of the bottom layer of the image pickup module can be reduced.
Description
Technical Field
The present invention relates to the field of image data processing technologies, and in particular, to a method for transmitting image data, a mobile terminal, and a storage medium.
Background
For an existing mobile terminal taking an Android system as an example, a camera Application (APP for short) often needs to obtain YUV (Luminance or Luma) data output by a camera (camera), where "Y" represents brightness (i.e., gray scale value), and "U" and "V" represent Chrominance (i.e., Chroma)) data to perform special effects, such as filter, beauty, scene detection, and the like.
The standard interface for acquiring YUV data by the camera shooting APP in the existing android system is a data stream specially added for the camera shooting module so as to specially provide the camera shooting APP for acquiring the YUV data acquired by the camera shooting module from the camera shooting module.
However, such a mode of operation has a number of disadvantages: 1. bandwidth, memory consumption and power consumption are increased; 2. the newly added data stream and the preview data transmitted by the camera module to the Display module (Display) of the mobile terminal are separated, so that an image post-processing algorithm at the bottom layer of the camera module needs to process two paths of data, and the data processing amount is large.
Disclosure of Invention
The invention solves the technical problem of how to reduce the system bandwidth, the memory consumption and the power consumption and reduce the data processing amount of the bottom layer of the camera module.
To solve the foregoing technical problem, an embodiment of the present invention provides a method for transmitting image data, including: receiving and caching image data acquired by a camera module through a first data path, wherein the first data path is connected with the cache module and the camera module; and transmitting the cached image data to a display module through a second data path, wherein the second data path connects the cache module and the display module.
Optionally, the first data path and the second data path are independent of each other.
Optionally, the transmitting the buffered image data to the display module through the second data path includes: acquiring image data cached by the caching module; processing the image data to obtain processed image data; and transmitting the processed image data to the display module through the second data path.
Optionally, the transmission method further includes: and transmitting the image data to an encoding module for video encoding.
Optionally, the cache module includes: a first queue for buffering image data received through the first data path; and the second queue is used for buffering the image data obtained from the first queue and transmitting the image data to the outside through the second data path.
Optionally, the first queue and the second queue are independent.
Optionally, the buffering, by the second queue, the image data obtained from the first queue includes: the second queue copies the image data buffered by the first queue.
Optionally, the buffering, by the second queue, the image data obtained from the first queue includes: and the second queue copies the processed image data, wherein the processed image data is the processing result of the image data cached by the first queue.
Optionally, the first queue and the second queue are both first-in first-out queues.
In order to solve the above technical problem, an embodiment of the present invention further provides an image data transmission apparatus, including: the receiving module is used for receiving and caching the image data acquired by the camera module through a first data path, wherein the first data path is connected with the caching module and the camera module; and the transmission module is used for transmitting the cached image data to the display module through a second data path, wherein the second data path is connected with the cache module and the display module.
In order to solve the above technical problem, an embodiment of the present invention further provides a mobile terminal, including: the camera module is used for collecting image data; the display module is used for displaying the image data acquired by the camera module; the cache module is in data transmission with the camera module through a first data path and in data transmission with the display module through a second data path; and the camera shooting application program module executes the method to control the transmission of the image data through the first data path and the second data path.
Optionally, the first data path and the second data path are both established by the camera application module.
To solve the above technical problem, an embodiment of the present invention further provides a storage medium, on which a computer program is stored, and the computer program executes the steps of the above method when being executed by a processor.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides a method for transmitting image data, which comprises the following steps: receiving and caching image data acquired by a camera module through a first data path, wherein the first data path is connected with the cache module and the camera module; and transmitting the cached image data to a display module through a second data path, wherein the second data path connects the cache module and the display module.
Compared with the prior art that a data stream needs to be additionally established on the basis of a data path between the display module and the camera module to acquire the image data of the camera module, the embodiment can acquire the image data without additionally increasing a data stream, thereby reducing the system bandwidth, the memory consumption and the power consumption and also reducing the data processing amount of the bottom layer of the camera module. Specifically, the cache module serves as a "transfer station" for image data between the display module and the camera module, so that the camera application module executing the embodiment can directly intercept the image data through the cache module without additionally increasing a data path.
Further, an embodiment of the present invention further provides a mobile terminal, including: the camera module is used for collecting image data; the display module is used for displaying the image data acquired by the camera module; the cache module is in data transmission with the camera module through a first data path and in data transmission with the display module through a second data path; and the camera shooting application program module executes the method to control the transmission of the image data through the first data path and the second data path.
By adopting the embodiment, the data access is respectively established between the display module and the camera module and the cache module by additionally arranging the cache module. Since the image data is originally transmitted through the cache module, the image pickup APP can directly fetch the image data from the cache module when the image pickup APP needs to fetch the image data, and an additional new path is not needed. Therefore, the mobile terminal adopting the embodiment can overcome the defects of the native interface of the android system and flexibly control YUV data.
Drawings
Fig. 1 is a schematic diagram of transmission of image data in a conventional mobile terminal;
FIG. 2 is a flow chart of a method for transmitting image data according to an embodiment of the present invention;
fig. 3 is a schematic diagram of image data transmission in a mobile terminal according to an embodiment of the present invention;
FIG. 4 is a data flow diagram of the cache module of FIG. 3;
FIG. 5 is a schematic diagram of producer enqueuing of the first queue and the second queue of FIG. 4;
FIG. 6 is a schematic diagram of consumer dequeuing of the first queue and the second queue of FIG. 4.
Detailed Description
As background art shows, the camera application of the android system is more and more important, and with the continuous update of the demand, the application program needs to perform more processing on the YUV data to present the preview and the photographing effect. Therefore, the camera application needs to obtain the image data (i.e., YUV raw data) collected by the camera module.
Taking an existing mobile terminal based on the android system as an example, referring to fig. 1, the Camera application module 11 (identified by Camera APP in the figure) is only responsible for establishing a data path (identified by a dashed arrow in the figure) between the Display module 12(Display) and the Camera module 13(Camera Hal). For example, the display module 12 sends a path establishment request (e.g., setSurface ()) to the camera application module 11, and the camera application module 11 sends a path establishment instruction (e.g., setPreviewSurface ()) to the camera module 13 to instruct the camera module 13 to establish a data path with the display module 12. Further, the camera module 13 can directly transmit image Data (identified by Preview Data in the figure) to the display module 12 through the Data path, so that the image taken by the camera can be displayed on the screen of the mobile terminal in real time.
Generally speaking, the camera application module 11 will not intervene in data interaction between the camera module 13 and the display module 12 after the aforementioned data path is established, that is, the existing camera application module 11 itself cannot acquire image data from the data path established between the display module 12 and the camera module 13.
In the existing mobile terminal, if the camera application module 11 wants to obtain the image data of the camera module 13, the camera application module 11 needs to notify the bottom layer of the camera module 13 to newly create a data stream to specially transfer the image data to the camera application module 11.
The existing disadvantage of obtaining YUV data by newly creating one data stream is that: 1. newly creating a flow will cause the increase of power consumption and memory usage of the mobile terminal; 2. the newly created data stream is not synchronized with the preview data stream transmitted over the data path shown in fig. 1.
In order to solve the above two disadvantages of the native interface of the android system and flexibly control YUV data, an embodiment of the present invention provides a method for transmitting image data, including: receiving and caching image data acquired by a camera module through a first data path, wherein the first data path is connected with the cache module and the camera module; and transmitting the cached image data to a display module through a second data path, wherein the second data path connects the cache module and the display module.
According to the embodiment, the image data can be acquired without additionally adding a data stream, so that the system bandwidth, the memory consumption and the power consumption are reduced, and the data processing amount of the bottom layer of the camera module can be reduced. Specifically, the cache module serves as a "transfer station" for image data between the display module and the camera module, so that the camera application module executing the embodiment can directly intercept the image data through the cache module without additionally increasing a data path.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
FIG. 2 is a flow chart of a method for transmitting image data according to an embodiment of the present invention; fig. 3 is a schematic diagram of image data transmission in a mobile terminal according to an embodiment of the present invention.
The present embodiment may be executed by a mobile terminal, and in particular, may be executed by a camera application module of the mobile terminal. For example, the mobile terminal may be an android-based smart device.
Specifically, referring to fig. 2, the method for transmitting image data according to this embodiment may include the following steps:
step S101, receiving and caching image data collected by a camera module through a first data path, wherein the first data path is connected with the cache module and the camera module;
step S102, transmitting the buffered image data to a display module through a second data path, where the second data path connects the buffer module and the display module.
Further, with reference to fig. 2 and fig. 3, the mobile terminal according to this embodiment may include: the camera module 23 is used for acquiring image data; the display module 22 is used for displaying the image data acquired by the camera module 23; a buffer module 24, which performs data transmission with the camera module 23 through a first data path L1, and performs data transmission with the display module 22 through a second data path L2; the camera application module 21, executing the method of fig. 2, controls the transfer of the image data via the first data path L1 and the second data path L2.
For example, the camera application module 21 transfers a path interface (e.g., surface) for display to the cache module 24, and obtains a new path interface from the cache module 24. Further, the camera application module 21 passes the path interface obtained from the buffer module 24 to the camera module 23.
Thus, the buffer module 24 establishes communication with the display module 22 and the camera module 23, i.e., the first data path L1 and the second data path L2, respectively.
Each frame of image data collected by the camera module 23 is transmitted to the buffer module 24 through the first data path L1, the buffer module 24 may perform image processing after obtaining the image data, and then transmit the processed image data to the display module 22 through the second data path L2.
Further, the channel interface Surface can be regarded as a Producer (Producer), which can be in the form of an ANativeWindow at the native level.
Further, the first data path L1 may be connected to a bottom Layer of the camera module 23, i.e. a Hardware Abstraction Layer (HAL).
Further, the first datapath L1 and the second datapath L2 are independent of each other.
Further, the first data path L1 and the second data path L2 are both established by the camera application module 21.
Further, the image data may be YUV data.
In one implementation, the step S102 may include the steps of: acquiring the image data cached by the caching module 24; processing the image data to obtain processed image data; the processed image data is transmitted to the display module 22 via the second data path L2.
In a specific implementation, after the step S101, the transmission method according to this embodiment may further include the steps of: and transmitting the image data to an encoding module for video encoding.
In one implementation, the cache module 24 may include: a first queue for buffering image data received through the first data path L1; and the second queue is used for buffering the image data obtained from the first queue and transmitting the image data outwards through the second data path L2.
Specifically, the first queue corresponds to the first data path L1 and the second queue corresponds to the second data path L2.
Further, the first Queue and the second Queue may be Buffer queues (Buffer Queue), both of which are queues for storing image data.
Further, the first queue and the second queue are independent.
Further, the First queue and the second queue are both First-In First-Out (FIFO) queues.
Further, the first queue and the second queue are both producer consumer queues. Wherein, the Producer (Producer) of the first queue is the camera module 23, and the Consumer (Consumer) is the cache module 24; the producer of the second queue is the buffer module 24 and the consumer is the display module 22.
In a typical application scenario, the buffer module 24 may create a buffer queue and corresponding producer and consumer to obtain a first queue and a second queue.
Further, the cache module 24 may implement a create path interface (getSurface ()), and create the first data path L1 and the second data path L2 by the producer (i.e., the camera module 23 and the cache module 24) and return them to the camera application module 21. Since the interfaces of the camera application module 21, the camera module 23, and the display module 22 are all surface, the buffer module 24 is required to package the producers of the first queue and the second queue as surface.
Further, the caching module 24 may perform operation a1 to implement data replication between two queues (i.e., the first queue and the second queue) by registering that there is a data storage callback function (onFrameAvailable ()) in the producer queue. When the camera module 23 inserts the produced image data into the cache queue of the cache module 24, the function is called back, and at this time, the camera application module 21 may take the image data out of the cache queue for processing, and copy the image data into the cache of the display module 22 after the processing is completed.
For example, referring to fig. 4, the cache module 24 performs operation a2 to store image data acquired by the camera module 23 as a producer in the first queue by performing an enqueue operation (acuurebuffer).
Further, the buffer module 24 performs operation a3 to fetch the image data in the first queue by performing a dequeue operation (dequeue buffer).
Further, the cache module 24 performs operation a4 to obtain and Lock the data address produced by the storage camera module 23 by performing a Lock consumer cache (Lock consumer buffer).
Further, the cache module 24 performs operation a5 to obtain an address for storing the data rendered by the display module 22 and Lock the data by performing Lock producer cache buffer (Lock producer buffer).
Further, the cache module 24 performs operation a6 to perform data copying by performing a Copy producer buffer to producer buffer operation (Copy consumer buffer) to Copy the image data cached in the first queue to the second queue.
Further, the cache module 24 performs operation a7 to Unlock the data block rendered by the deposit display module 22 by performing an Unlock producer cache operation (Unlock producer buffer).
Further, the cache module 24 performs an operation a8 to Unlock the data block produced by the storage camera module 23 by performing an Unlock consumer cache (Unlock consumer buffer).
Further, the cache module 24 performs operation a9 to store the unlocked data in the second queue by performing an enqueue operation (queue buffer).
Further, the buffer module 24 performs operation a10 to transmit the image data buffered in the second queue to the display module 22 by performing a dequeue operation (releaseBuffer).
In a variation, the second queue may copy processed image data, where the processed image data is a processing result of the image data buffered by the first queue.
For example, in executing operation a6, instead of simply copying (copy) the image data buffered in the first queue to the second queue, the image data buffered in the first queue is fetched and processed by the camera application module 21, and the processed image data is buffered in the second queue. Thereby, a synchronized preview data stream can be achieved.
In one implementation, for either of the first queue and the second queue, when the queue is a first-in-first-out queue, the data flow when the producer as the queue stores the produced image data into the queue may be as shown in fig. 5. Specifically, assume that the queue includes n +1 image data from 0 to n at time t, and new data is stored at time t + 1. The newly stored n +1 th image data is enqueued and buffered behind the nth image data based on the first-in first-out logic. Accordingly, the queue is updated to n +2 image data of 0 to n +1 at time t + 2.
Similarly, the data flow when a consumer acting as a queue takes the image data buffered by the queue from the queue can be as shown in fig. 6. Specifically, assume that the queue includes n +1 image data from 0 to n at time t, and there is data to be fetched at time t + 1. Then the 0 th image data is fetched first based on the first-in-first-out logic. Accordingly, the queue is updated to n image data of 0 (1 st image data corresponding to time t) to n-1 (n image data corresponding to time t) at time t + 2.
In one implementation, the enqueue and dequeue operations may set a wait timeout mechanism for either of the first queue and the second queue. Specifically, when the queue length is equal to the set maximum length, the enqueue operation of the producer may be blocked, and if the blocked time is longer than the set waiting time, the buffer module 24 may perform error reporting.
Similarly, the dequeue operation of the consumer whose queue is empty may be blocked, and the buffer module 24 may also perform error reporting if the blocked time exceeds the waiting time.
In a specific implementation, the android system of the mobile terminal may manage cross-process transmission of image layer data through a cache queue. The two ends of the buffer queue (BufferQueue) are respectively the producer and the consumer of the image data. Data transferred through the buffer queue may be referred to as an image buffer (graphics buffer).
In one implementation, the buffer module 24 may include at least one buffer region, and one buffer region may contain one frame of image, and the buffer region is generally allocated and recycled by the gradloc module in the hardware abstraction layer. The cache area may be from the general memory of the mobile terminal or from a hardware-specific memory pool according to the requirement.
For example, the buffer queue may include 2 to 3 buffer areas, and may be allocated as needed during the image data transmission process according to the embodiment. The data of the cache module 24 passes through the file handle and there is no copy of the big data. The process receiving the data cached by the cache module 24 needs to map to the virtual address space for access, but may be accessed directly (via DMA, etc.) by other hardware devices instead of through the CPU. (this is the relevant description retrieved for learning the relevant background art, and is used to explain the basic principle of the cache module, please confirm whether it is accurate and whether it needs to be described in the specification)
In a specific implementation, the cache module 24 is implemented in a native layer of the android system of the mobile terminal, and calls an external interface when data transmission is performed with other modules.
For example, the camera application module 21 may send a native classninit () function to the cache module 24 to create and initialize the cache module.
Further, the camera application module 21 may send a native init () function to the cache module 24 to create and initialize the cache production consumption queue.
Further, the camera application module 21 may send a setPreviewSurface () function to the cache module 24 to link the display module and the cache module.
Further, the cache module 24 may send a native getsurface () function to the camera application module 21 to link the camera module and the cache module.
Further, the camera application module 21 may send a native close () function to the cache module 24 to close the cache module and release the resource.
By adopting the embodiment, the image data can be acquired without additionally adding a data stream, so that the system bandwidth, the memory consumption and the power consumption are reduced, and the data processing capacity of the bottom layer of the camera module can be reduced. Specifically, the cache module serves as a "transfer station" for image data between the display module and the camera module, so that the camera application module executing the embodiment can directly intercept the image data through the cache module without additionally increasing a data path. For example, for a camera module, reducing one data flow means twice less data processing amount, and algorithms such as beauty and filter only need to process one data.
Furthermore, a cache module is additionally arranged, and data paths are respectively established between the display module and the camera module and the cache module. Since the image data is originally transmitted through the cache module, the image pickup APP can directly fetch the image data from the cache module when the image pickup APP needs to fetch the image data, and an additional new path is not needed. Therefore, the mobile terminal adopting the embodiment can overcome the defects of the native interface of the android system and flexibly control YUV data.
Further, in the embodiment, a cache queue (buffer queue) mechanism of the android system is utilized to realize an efficient image post-processing and rendering framework, and image data can be processed and displayed without adding a new data path at the image pickup APP level through the framework. Further, the image pickup APP side can completely and autonomously process image data and shunt.
Further, the embodiment of the invention also discloses a device for transmitting the image data. Those skilled in the art understand that the transmission device of the present embodiment can be used to implement the method technical solution described in the embodiment of fig. 2.
Specifically, the transmission device may include: the receiving module is used for receiving and caching the image data acquired by the camera module through a first data path, wherein the first data path is connected with the caching module and the camera module; and the transmission module is used for transmitting the cached image data to the display module through a second data path, wherein the second data path is connected with the cache module and the display module. For example, the image data transmission means may correspond to the camera application module 21.
For more details on the operation principle and the operation mode of the transmission device, reference may be made to the related description in fig. 2, and details are not repeated here.
Further, the embodiment of the present invention also discloses a storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the method technical solution described in the embodiment shown in fig. 2 is executed. Preferably, the storage medium may include a computer-readable storage medium such as a non-volatile (non-volatile) memory or a non-transitory (non-transient) memory. The storage medium may include ROM, RAM, magnetic or optical disks, etc.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (12)
1. A method for transmitting image data, comprising:
receiving and caching image data acquired by a camera module through a first data path, wherein the first data path is connected with the cache module and the camera module;
and transmitting the cached image data to a display module through a second data path, wherein the second data path connects the cache module and the display module.
2. The transmission method according to claim 1, wherein the first data path and the second data path are independent of each other.
3. The method of claim 1, wherein the transmitting the buffered image data to a display module via a second data path comprises:
acquiring image data cached by the caching module;
processing the image data to obtain processed image data;
and transmitting the processed image data to the display module through the second data path.
4. The transmission method according to claim 1 or 3, further comprising:
and transmitting the image data to an encoding module for video encoding.
5. The transmission method according to claim 1, wherein the buffer module comprises:
a first queue for buffering image data received through the first data path;
and the second queue is used for buffering the image data obtained from the first queue and transmitting the image data to the outside through the second data path.
6. The transmission method according to claim 5, wherein the first queue and the second queue are independent.
7. The transmission method according to claim 5, wherein the second queue buffering the image data obtained from the first queue comprises: the second queue copies the image data buffered by the first queue.
8. The transmission method according to claim 5, wherein the second queue buffering the image data obtained from the first queue comprises: and the second queue copies the processed image data, wherein the processed image data is the processing result of the image data cached by the first queue.
9. The transmission method according to claim 5, wherein the first queue and the second queue are both first-in-first-out queues.
10. A mobile terminal, comprising:
the camera module is used for collecting image data;
the display module is used for displaying the image data acquired by the camera module;
the cache module is in data transmission with the camera module through a first data path and in data transmission with the display module through a second data path;
a camera application module that performs the method of any of claims 1 to 9 to control the transfer of the image data over the first and second data paths.
11. The mobile terminal of claim 10, wherein the first data path and the second data path are both established by the camera application module.
12. A storage medium having a computer program stored thereon, the computer program, when being executed by a processor, performing the steps of the method according to any one of claims 1 to 9.
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| CN116701675A (en) * | 2022-02-25 | 2023-09-05 | 荣耀终端有限公司 | Image data processing method and electronic equipment |
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| CN113992854A (en) * | 2021-10-29 | 2022-01-28 | Oppo广东移动通信有限公司 | Image preview method and device, electronic equipment and computer readable storage medium |
| CN116701675A (en) * | 2022-02-25 | 2023-09-05 | 荣耀终端有限公司 | Image data processing method and electronic equipment |
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