CN104394460A - Audio-video file locating method and device - Google Patents
Audio-video file locating method and device Download PDFInfo
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- CN104394460A CN104394460A CN201410680834.1A CN201410680834A CN104394460A CN 104394460 A CN104394460 A CN 104394460A CN 201410680834 A CN201410680834 A CN 201410680834A CN 104394460 A CN104394460 A CN 104394460A
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- 230000004807 localization Effects 0.000 claims description 15
- 230000006870 function Effects 0.000 description 3
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/439—Processing of audio elementary streams
- H04N21/4394—Processing of audio elementary streams involving operations for analysing the audio stream, e.g. detecting features or characteristics in audio streams
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
- H04N21/44008—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving operations for analysing video streams, e.g. detecting features or characteristics in the video stream
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/85—Assembly of content; Generation of multimedia applications
- H04N21/854—Content authoring
- H04N21/8547—Content authoring involving timestamps for synchronizing content
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Television Signal Processing For Recording (AREA)
Abstract
The invention is suitable for the field of media technology and discloses an audio-video file locating method and device. The audio-video file locating method includes that acquiring the time stamp of a frame to be located in an audio-video file; reading the file frame information of the audio-video file; acquiring the offset address of the frame to be located in the audio-video file from the file frame information according to the time stamp; reading the audio-video file behind the offset address. The audio-video file locating method realizes to quickly locate the audio-video file according to the time stamp of each frame in the audio-video file, solves the problem of high system load due to the fact that the existing method needs to traverse the whole audio-video file, reduces the system resource consumption and greatly improves the audio-video file locating efficiency and precision.
Description
Technical field
The invention belongs to technical field of media, particularly relate to a kind of audio-video document localization method and device.
Background technology
Existing method, when positioning audio-video document, needs to travel through whole audio-video document, just can navigate on the position of specifying, and system cloud gray model load can be caused so large, and the resource taken is many, makes the location efficiency of audio-video document low.
Summary of the invention
Given this, the embodiment of the present invention is to provide a kind of audio-video document localization method and device, the efficiency providing audio-video document to locate with the running load by reducing system and accuracy.
First aspect, a kind of audio-video document localization method, described method comprises:
Obtain the timestamp of frame to be positioned in audio-video document;
Read the file frame information of described audio-video document;
From described file frame information, the offset address of described frame to be positioned in audio-video document is obtained according to described timestamp;
Read the audio-video document after described offset address.
Further, also comprise before described method:
File frame information is added at the top of file of described audio-video document;
Described file frame information comprises chained list length, frame information chained list and file content;
Described chained list length is the length of frame information chained list;
Described frame information chained list comprises the frame information of multiple frame, and described frame information comprises the Presentation Time Stamp of each frame, frame type and the offset address of each frame in audio-video document.
Further, the timestamp of described acquisition frame to be positioned in audio-video document is specially:
Obtain the decoded time stamp of frame to be positioned in audio-video document;
Described decoded time stamp is converted to Presentation Time Stamp, obtains the Presentation Time Stamp of frame to be positioned.
Further, describedly from described file frame information, obtain the offset address of frame to be positioned in audio-video document according to described timestamp and be specially:
The chained list length of file reading frame information;
According to described chained list length, read the Presentation Time Stamp of each frame in frame information chained list, judge that whether the Presentation Time Stamp of frame to be positioned is identical with the Presentation Time Stamp of this read frame;
When judged result is for being, obtain the offset address of this frame in audio-video document.
Further, described method also comprises:
When judging that the Presentation Time Stamp of frame to be positioned is not identical with the Presentation Time Stamp of this read frame, read the Presentation Time Stamp of next frame in frame information chained list.
Second aspect, a kind of audio-video document positioner, described device comprises:
Timestamp acquisition module, for obtaining the timestamp of frame to be positioned in audio-video document;
File frame information read module, for reading the file frame information of described audio-video document;
Offset address acquisition module, for obtaining the offset address of described frame to be positioned in audio-video document according to described timestamp from described file frame information;
File read module, for reading the audio-video document after described offset address.
Further, described device also comprises:
File frame information adds module, adds file frame information for the top of file at described audio-video document;
Described file frame information comprises chained list length, frame information chained list and file content;
Described chained list length is the length of frame information chained list;
Described frame information chained list comprises the frame information of multiple frame, and described frame information comprises the Presentation Time Stamp of each frame, frame type and the offset address of each frame in audio-video document.
Further, described timestamp acquisition module comprises:
Acquiring unit, for obtaining the decoded time stamp of frame to be positioned in audio-video document;
Converting unit, for described decoded time stamp is converted to Presentation Time Stamp, obtains the Presentation Time Stamp of frame to be positioned.
Further, described offset address acquisition module comprises:
Reading unit, for the chained list length of file reading frame information;
Judging unit, for according to described chained list length, reads the Presentation Time Stamp of each frame in frame information chained list, judges that whether the Presentation Time Stamp of frame to be positioned is identical with the Presentation Time Stamp of this read frame;
Acquiring unit, for when the judged result of judge module is for being, obtains the offset address of this frame in audio-video document.
Further, described judging unit also for:
When judging that the Presentation Time Stamp of frame to be positioned is not identical with the Presentation Time Stamp of this read frame, read the Presentation Time Stamp of next frame in frame information chained list.
Compared with prior art, the embodiment of the present invention, by the top of file of amendment audio-video document, increases file frame information at described top of file; When carrying out the location of audio-video document, first obtain the timestamp of frame to be positioned in audio-video document; Read the file frame information of described audio-video document; Then from described file frame information, the offset address of described frame to be positioned in audio-video document is obtained according to described timestamp; Read the audio-video document after described offset address; Thus achieve and carry out quick position audio-video document according to the timestamp of each frame in audio-video document, solve existing method to need to travel through whole audio-video document and the large problem of the system load caused, decrease the consumption of system resource, drastically increase location efficiency and the accuracy of audio-video document.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the first realization flow figure of the audio-video document localization method that the embodiment of the present invention one provides;
Fig. 2 is the specific implementation flow chart of step S103 in the audio-video document localization method that provides of the embodiment of the present invention two;
Fig. 3 is the composition structure chart of the audio-video document positioner that the embodiment of the present invention three provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
In embodiments of the present invention, file frame information is increased by the top of file at audio-video document; When carrying out the location of audio-video document, first obtain the timestamp of frame to be positioned in audio-video document; Read the file frame information of described audio-video document; Then from described file frame information, the offset address of described frame to be positioned in audio-video document is obtained according to described timestamp; Read the audio-video document after described offset address; Thus achieve and carry out quick position audio-video document according to the timestamp of each frame in audio-video document, solve existing method to need to travel through whole audio-video document and the large problem of the system load caused, decrease the consumption of system resource, drastically increase location efficiency and the accuracy of audio-video document.The embodiment of the present invention additionally provides corresponding device, is described in detail respectively below.
embodiment one
Fig. 1 shows the first realization flow of the audio-video document localization method that the embodiment of the present invention one provides, and for convenience of explanation, illustrate only part related to the present invention.
In embodiments of the present invention, described method is applied to the location to the frame information in audio-video document, and described audio-video document includes but not limited to the audio-video document of Vehicular video terminal, the audio-video document etc. of television set/Set Top Box.
Described audio-video document is provided with file frame information in top of file position, have recorded the essential information of each frame in audio-video document in described file frame information.Preferably, described file frame information comprises chained list length, frame information chained list and file content.As shown in table 1, be the structure of the file frame information that the embodiment of the present invention provides.Wherein, described chained list length is the length of frame information chained list; Described frame information chained list comprises the frame information of multiple frame, described frame can be frame of video and audio frame, described frame information includes but not limited to the Presentation Time Stamp PTS of each frame, frame type and the offset address of each frame in audio-video document, and its structure is as shown in table 2.Described file frame information, when preserving audio-video document, is added on the top of file of described audio-video document, and stores in the lump with described audio-video document.。
| Chained list length | Frame information chained list | File content |
Table 1
| Presentation Time Stamp PTS | Frame type identifies | Offset address |
Table 2
As shown in Figure 1, described audio-video document localization method comprises:
In step S101, obtain the timestamp of frame to be positioned in audio-video document.
In embodiments of the present invention, in order to improve the accuracy of location, described timestamp preferably adopts the Presentation Time Stamp PTS coming from system time.Therefore, step S101 comprises:
A. the decoded time stamp of frame to be positioned in audio-video document is obtained;
B. described decoded time stamp is converted to Presentation Time Stamp, obtains the Presentation Time Stamp of frame to be positioned.
When carrying out the location of audio-video document, receiving user and specifying time point to be positioned, thus obtaining the decoded time stamp of frame to be positioned in audio-video document.Described scramble time stamp DTS is the timestamp from encoder, is relative time stamp, needs described scramble time stamp to be converted to Presentation Time Stamp PTS, thus obtains the Presentation Time Stamp of frame to be positioned.Described Presentation Time Stamp can be accurate to millisecond, thus can improve the precision of audio-video document location.
In step s 102, the file frame information of described audio-video document is read.
In step s 103, from described file frame information, the offset address of described frame to be positioned in audio-video document is obtained according to described timestamp.
In embodiments of the present invention, after getting the file frame information of audio-video document, therefrom read chained list length, to determine that this audio-video document has how many frames.Then frame information chained list is traveled through, with the frame that the Presentation Time Stamp searched out with obtain in step S101 is identical.If find the frame identical with obtained Presentation Time Stamp, then obtain the offset address that this frame starts relative to audio-video document, thus achieve the location to audio-video document.
Wherein, step S103 will be described in detail in subsequent embodiment, specifically refer to the description of subsequent embodiment.
In step S104, read the audio-video document after described offset address.
In embodiments of the present invention, after getting offset address, from described offset address, read audio-video document.The data read are the data of described audio-video document after described offset address.
By above-mentioned steps, during conducting frame location, use the displaying time PTS with more pinpoint accuracy to find the position of frame to be positioned in audio-video document, drastically increase the accuracy and precision of audio-video document location; Further, the embodiment of the present invention with the addition of file frame information at audio-video document head in advance, the file frame information of reading and comparison top of file is only needed to position, and do not need to travel through whole audio-video document, thus decrease the consumption of system resource, improve speed and the efficiency of audio-video document location.Be particularly useful for the equipment of resource anxiety, such as embedded device.
In embodiments of the present invention, file frame information is increased by the top of file at audio-video document; When carrying out the location of audio-video document, first obtain the timestamp of frame to be positioned in audio-video document; Read the file frame information of described audio-video document; Then from described file frame information, the offset address of described frame to be positioned in audio-video document is obtained according to described timestamp; Read the audio-video document after described offset address; Thus achieve and carry out quick position audio-video document according to the timestamp of each frame in audio-video document, solve existing method to need to travel through whole audio-video document and the large problem of the system load caused, decrease the consumption of system resource, drastically increase location efficiency and the accuracy of audio-video document.
embodiment two
Fig. 2 shows the specific implementation flow process of step S103 in the audio-video document localization method that the embodiment of the present invention two provides, and for convenience of explanation, illustrate only part related to the present invention.
The embodiment of the present invention obtains the offset address of frame to be positioned in audio-video document by the Presentation Time Stamp comparison of each frame in audio-video document, therefore, only needs to travel through the Presentation Time Stamp about each frame in file frame information.Below will be described in detail step S103.
As shown in Figure 2, step S103 comprises:
In step s 201, the chained list length of file reading frame information.
In embodiments of the present invention, described chained list length is the length for frame information chained list; Described frame information chained list comprises the frame information of multiple frame, by the chained list length in file reading frame information, thus determines the number of frame in audio-video document.Described frame information includes but not limited to the Presentation Time Stamp PTS of each frame, frame type and the offset address of each frame in audio-video document.
In step S202, according to described chained list length, read the Presentation Time Stamp of first frame in frame information chained list.
In step S203, judge that whether the Presentation Time Stamp of frame to be positioned is identical with the Presentation Time Stamp of this read frame.
In embodiments of the present invention, after often reading the Presentation Time Stamp of a frame in frame information chained list, the Presentation Time Stamp of itself and frame to be positioned is compared, to judge the position of frame to be positioned in audio-video document.Therefore, when judged result is for being, show that this read frame is frame to be positioned, then perform step S204; Otherwise, perform step S205.
In step S204, obtain the offset address of this frame in audio-video document.
The offset address obtained is the offset address of frame to be positioned relative to audio-video document head, thus achieves the location to audio-video document.
In step S205, read the Presentation Time Stamp of next frame in frame information chained list.
When judging that the Presentation Time Stamp of frame to be positioned is not identical with the Presentation Time Stamp of this read frame, then read the Presentation Time Stamp of next frame, and return step S203, until search out the offset address of frame to be positioned.Described next frame is the frame in described chained list length range.
By above-mentioned steps, during conducting frame location, use the displaying time PTS with more pinpoint accuracy to find the position of frame to be positioned in audio-video document, drastically increase the accuracy and precision of audio-video document location; Further, the embodiment of the present invention with the addition of file frame information at audio-video document head in advance, the Presentation Time Stamp in reading and comparison file frame information is only needed to position, and do not need to travel through whole audio-video document, thus decrease the consumption of system resource, improve speed and the efficiency of audio-video document location.
embodiment three
Fig. 3 shows the composition structure of the audio-video document positioner that the embodiment of the present invention three provides, and for convenience of explanation, illustrate only part related to the present invention.
In embodiments of the present invention, described device, for realizing the audio-video document localization method described in Fig. 1 and Fig. 2 embodiment, can be the unit being built in the software unit of mobile terminal, hardware cell or software and hardware combining.Described mobile terminal is preferably Vehicular video terminal, television set, Set Top Box or mobile phone.
As shown in Figure 3, described device comprises:
Timestamp acquisition module 31, for obtaining the timestamp of frame to be positioned in audio-video document.
File frame information read module 32, for reading the file frame information of described audio-video document.
Offset address acquisition module 33, for obtaining the offset address of described frame to be positioned in audio-video document according to described timestamp from described file frame information.
File read module 34, for reading the audio-video document after described offset address.
Further, described device also comprises:
File frame information adds module 35, adds file frame information for the top of file at described audio-video document;
Described file frame information comprises chained list length, frame information chained list and file content;
Described chained list length is the length of frame information chained list;
Described frame information chained list comprises the frame information of multiple frame, and described frame information comprises the Presentation Time Stamp of each frame, frame type and the offset address of each frame in audio-video document.
Further, in order to improve the accuracy of location, described timestamp preferably adopts the Presentation Time Stamp PTS coming from system time in embodiments of the present invention.Therefore, described timestamp acquisition module 31 comprises:
Acquiring unit 311, for obtaining the decoded time stamp of frame to be positioned in audio-video document;
Converting unit 312, for described decoded time stamp is converted to Presentation Time Stamp, obtains the Presentation Time Stamp of frame to be positioned.
Further, the embodiment of the present invention obtains the offset address of frame to be positioned in audio-video document by the Presentation Time Stamp comparison of each frame in audio-video document, therefore, only needs to travel through the Presentation Time Stamp about each frame in file frame information.Described offset address acquisition module 33 comprises:
Reading unit 331, for the chained list length of file reading frame information;
Judging unit 332, for according to described chained list length, reads the Presentation Time Stamp of each frame in frame information chained list, judges that whether the Presentation Time Stamp of frame to be positioned is identical with the Presentation Time Stamp of this read frame;
Acquiring unit 333, for when the judged result of judge module is for being, obtains the offset address of this frame in audio-video document.
Further, when judging that the Presentation Time Stamp of frame to be positioned is not identical with the Presentation Time Stamp of this read frame information, described judging unit 333 also for:
Read the Presentation Time Stamp of next frame in frame information chained list.
It should be noted that, device in the embodiment of the present invention may be used for the whole technical schemes realized in said method embodiment, the function of its each functional module can according to the method specific implementation in said method embodiment, its specific implementation process can refer to the associated description in above-described embodiment, repeats no more herein.
In embodiments of the present invention, file frame information is increased by the top of file at audio-video document; When carrying out the location of audio-video document, first obtain the timestamp of frame to be positioned in audio-video document; Read the file frame information of described audio-video document; Then from described file frame information, the offset address of described frame to be positioned in audio-video document is obtained according to described timestamp; Read the audio-video document after described offset address; Thus achieve and carry out quick position audio-video document according to the timestamp of each frame in audio-video document, solve existing method to need to travel through whole audio-video document and the large problem of the system load caused, decrease the consumption of system resource, drastically increase location efficiency and the accuracy of audio-video document.
Those of ordinary skill in the art it is also understood that, the all or part of step realized in above-described embodiment method is that the hardware that can carry out instruction relevant by program has come, described program can be stored in a computer read/write memory medium, described storage medium, comprises ROM/RAM, disk, CD etc.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention.Such as, modules is carry out dividing according to function logic, but is not limited to above-mentioned division, as long as can realize corresponding function; In addition, the concrete title of each functional module, also just for the ease of mutual differentiation, is not limited to protection scope of the present invention.
All any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an audio-video document localization method, is characterized in that, described method comprises:
Obtain the timestamp of frame to be positioned in audio-video document;
Read the file frame information of described audio-video document;
From described file frame information, the offset address of described frame to be positioned in audio-video document is obtained according to described timestamp;
Read the audio-video document after described offset address.
2. audio-video document localization method as claimed in claim 1, is characterized in that, also comprise before described method:
File frame information is added at the top of file of described audio-video document;
Described file frame information comprises chained list length, frame information chained list and file content;
Described chained list length is the length of frame information chained list;
Described frame information chained list comprises the frame information of multiple frame, and described frame information comprises the Presentation Time Stamp of each frame, frame type and the offset address of each frame in audio-video document.
3. audio-video document localization method as claimed in claim 1, it is characterized in that, the timestamp of described acquisition frame to be positioned in audio-video document comprises:
Obtain the decoded time stamp of frame to be positioned in audio-video document;
Described decoded time stamp is converted to Presentation Time Stamp, obtains the Presentation Time Stamp of frame to be positioned.
4. as claimed in claim 2 or claim 3 audio-video document localization method, is characterized in that, describedly from described file frame information, obtains the offset address of frame to be positioned in audio-video document according to described timestamp and comprises:
The chained list length of file reading frame information;
According to described chained list length, read the Presentation Time Stamp of each frame in frame information chained list, judge that whether the Presentation Time Stamp of frame to be positioned is identical with the Presentation Time Stamp of this read frame;
When judged result is for being, obtain the offset address of this frame in audio-video document.
5. audio-video document localization method as claimed in claim 4, it is characterized in that, described method also comprises:
When judging that the Presentation Time Stamp of frame to be positioned is not identical with the Presentation Time Stamp of this read frame, read the Presentation Time Stamp of next frame in frame information chained list.
6. an audio-video document positioner, is characterized in that, described device comprises:
Timestamp acquisition module, for obtaining the timestamp of frame to be positioned in audio-video document;
File frame information read module, for reading the file frame information of described audio-video document;
Offset address acquisition module, for obtaining the offset address of described frame to be positioned in audio-video document according to described timestamp from described file frame information;
File read module, for reading the audio-video document after described offset address.
7. audio-video document positioner as claimed in claim 6, it is characterized in that, described device also comprises:
File frame information adds module, adds file frame information for the top of file at described audio-video document;
Described file frame information comprises chained list length, frame information chained list and file content;
Described chained list length is the length of frame information chained list;
Described frame information chained list comprises the frame information of multiple frame, and described frame information comprises the Presentation Time Stamp of each frame, frame type and the offset address of each frame in audio-video document.
8. audio-video document positioner as claimed in claim 6, it is characterized in that, described timestamp acquisition module comprises:
Acquiring unit, for obtaining the decoded time stamp of frame to be positioned in audio-video document;
Converting unit, for described decoded time stamp is converted to Presentation Time Stamp, obtains the Presentation Time Stamp of frame to be positioned.
9. audio-video document positioner as claimed in claim 7 or 8, it is characterized in that, described offset address acquisition module comprises:
Reading unit, for the chained list length of file reading frame information;
Judging unit, for according to described chained list length, reads the Presentation Time Stamp of each frame in frame information chained list, judges that whether the Presentation Time Stamp of frame to be positioned is identical with the Presentation Time Stamp of this read frame;
Acquiring unit, for when the judged result of judge module is for being, obtains the offset address of this frame in audio-video document.
10. audio-video document positioner as claimed in claim 9, is characterized in that, described judging unit also for:
When judging that the Presentation Time Stamp of frame to be positioned is not identical with the Presentation Time Stamp of this read frame, read the Presentation Time Stamp of next frame in frame information chained list.
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| CN108052915A (en) * | 2017-12-22 | 2018-05-18 | 深圳英飞拓科技股份有限公司 | A kind of method and device that Face datection is carried out to video and is identified |
| CN113835065A (en) * | 2021-09-01 | 2021-12-24 | 深圳壹秘科技有限公司 | Sound source direction determining method, device, equipment and medium based on deep learning |
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