CN107124571A - Videotape storage means and device - Google Patents

Abstract

The present application provides a video storage method and device. The method includes: obtaining the code stream structure pre-configured by the video encoder; dividing the corresponding storage space for each layer according to the code stream layer recorded by the code stream structure; Each video frame in the code stream is sequentially stored in the storage space corresponding to the layer according to the layer it belongs to; wherein, the priority and life cycle of the video frame stored in each storage space are negatively correlated with the number of layers it belongs to. This application implements flexible lifecycle management of video recordings through layered storage of code streams. Each storage space can be managed by setting different lifecycles according to the priority level of its corresponding layer. The lifecycle of video frames in a certain layer When it expires, the video frames in the corresponding storage space of this layer are discarded or overwritten, and there is no need to read and write the storage space multiple times to achieve life cycle management by means of frame dumping or lower bit rate dumping, which can reduce video recording The complexity of lifecycle management.

Description

Video storage method and device

technical field

The present application relates to the technical field of video surveillance, and in particular to a video storage method and device.

Background technique

In order to facilitate subsequent verification and use, storing the collected video images is the most basic functional requirement of the video surveillance system. In related technologies, the code stream generated by the video encoder is usually CBR (Constants Bit Rate, constant code stream), so the storage space in the video storage device can be divided into multiple space units according to the set size, and each space unit The recording of a fixed time unit is stored for quick retrieval of recording playback. After the video is stored in the video storage device, it also involves the lifecycle management of the video, that is, to delete or overwrite the video according to the importance of the video, or to transcode to a lower bit rate for storage, or to dump the frame. However, no matter whether it is to reduce the code rate or dump the frame, it involves reading the original storage space and overwriting the new code stream after the frame extraction or transcoding to the original storage space, which greatly affects the storage space. Multiple reads and writes add to the complexity of lifecycle management.

Contents of the invention

In view of this, the present application provides a video storage method and device to solve the problem that the existing storage method increases the complexity of life cycle management.

According to the first aspect of the embodiments of the present application, a video storage method is provided, the method is applied to a management server, and the method includes:

Obtain the code stream structure pre-configured by the video encoder;

divide the corresponding storage space for each layer according to the code stream layer recorded by the code stream structure;

Each video frame in the code stream sent by the video encoder is sequentially stored in the storage space corresponding to the layer according to the layer to which it belongs;

Wherein, the priority and life cycle of video frames stored in each storage space are negatively correlated with the number of layers to which they belong.

According to the second aspect of the embodiments of the present application, a video storage device is provided, the device is applied to a management server, and the device includes:

An acquisition unit, configured to acquire a code stream structure pre-configured by the video encoder;

A division unit, configured to divide the corresponding storage space for each layer according to the code stream layer recorded in the code stream structure;

The first storage unit is used to sequentially store each video frame in the code stream sent by the video encoder into the storage space corresponding to the layer according to its layer;

Wherein, the priority and life cycle of video frames stored in each storage space are negatively correlated with the number of layers to which they belong.

Applying the embodiment of the present application, before storing the video recording of a certain video device, the management server can obtain the code stream structure pre-configured in its video encoder, and record the code stream layer according to the obtained code stream structure as each layer Divide the corresponding storage space, and then store each video frame in the code stream sent by the video encoder in the corresponding storage space of the layer according to its layer, so that the code stream generated by the video encoder is layered For the purpose of storage, since the priority and life cycle of video frames stored in each storage space are negatively correlated with the number of layers to which they belong, each storage space can set a different life cycle according to the priority of its corresponding layer For management, when the life cycle of a video frame of a certain layer expires, the video frame in the corresponding storage space of the layer can be directly discarded or overwritten, without the need to dump the frame or reduce the bit rate. The storage space is read and written multiple times to realize video life cycle management, so the application can realize flexible life cycle management through layered storage, reducing the complexity of video life cycle management.

Description of drawings

FIG. 1 is a scene diagram of video storage according to an exemplary embodiment of the present application;

FIG. 2A is a flow chart of an embodiment of a video storage method according to an exemplary embodiment of the present application;

FIG. 2B is a code stream structure shown in the present application according to the embodiment shown in FIG. 2A;

FIG. 2C is another code stream structure shown in the present application according to the embodiment shown in FIG. 2A;

Fig. 3A is an embodiment flow chart of another video storage method according to an exemplary embodiment of the present application;

FIG. 3B is a division diagram of a logical group and a logical unit shown in the present application according to the code stream structure shown in FIG. 2B;

FIG. 3C is a block space division diagram of a storage space shown in the present application according to the logical group and logical unit structure shown in FIG. 3B;

FIG. 3D is a division diagram of a logical group and a logical unit shown in the present application according to the code stream structure shown in FIG. 2C;

FIG. 3E is a block space division diagram of a storage space shown in the present application according to the logical group and logical unit structure shown in FIG. 3D;

FIG. 4 is a hardware structural diagram of a management server according to an exemplary embodiment of the present application;

Fig. 5 is a structural diagram of an embodiment of a video recording storage device according to an exemplary embodiment of the present application.

detailed description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present application as recited in the appended claims.

The terminology used in this application is for the purpose of describing particular embodiments only, and is not intended to limit the application. As used in this application and the appended claims, the singular forms "a", "the", and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It should also be understood that the term "and/or" as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

It should be understood that although the terms first, second, third, etc. may be used in this application to describe various information, the information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of the present application, first information may also be called second information, and similarly, second information may also be called first information. Depending on the context, the word "if" as used herein may be interpreted as "at" or "when" or "in response to a determination."

Fig. 1 is a scene diagram of a video recording storage shown in the present application according to an exemplary embodiment. Fig. 1 includes a video device, a management server and a video storage device, wherein the video device may be an IPC (Internet Protocol Camera, network camera), It is provided with a video acquirer and a video encoder, the video acquirer is used to collect surveillance video, and the video encoder is used to encode the surveillance video collected by the video acquirer and generate a code stream, and then send the generated code stream to the management server; The management server is used to store the received code stream into a video storage device; the video storage device can be an NVR (Network Video Recorder, network video storage) or an IPSAN device, which is used to provide storage space for the code stream data of the surveillance video.

Fig. 2A is a flow chart of an embodiment of a video storage method shown in the present application according to an exemplary embodiment; Fig. 2B is a code stream structure shown in the present application according to the embodiment shown in Fig. 2A; Fig. 2C is a flow chart of the present application according to the Another code stream structure shown in the embodiment shown in Figure 2A, the video storage method can be applied to the management server shown in Figure 1 above, as shown in Figure 2A, the video storage method includes the following steps:

Step 201: Obtain the code stream structure pre-configured by the video encoder.

In an embodiment, the management server may pre-configure the encoding rules of the video encoder to obtain a corresponding code stream structure, so that the corresponding code stream structure may be obtained from the video encoder in the video device.

Step 202: Divide corresponding storage space for each layer according to the code stream layer recorded in the code stream structure.

In an embodiment, the code stream layer can be recorded in the code stream structure, that is, the number of code stream layers included in the code stream generated by the video encoder. Usually, the 0th layer in the code stream layer is the base layer, and the layer above the 1st layer The code stream layer is an enhancement layer. When decoding, the video frames of the enhancement layer need to be decoded according to the video frames of the base layer. Therefore, the video frames in the base layer are more important than the video frames in the enhancement layer. High, the priority is also high, and as the number of layers increases, the importance of video frames in the enhancement layer decreases, and the priority also decreases. Those skilled in the art can understand that the multiple divided storage spaces can be located on one hard disk of the video storage device, or on multiple hard disks of the video storage device, and the size of each storage space can be adjusted according to actual needs. The settings may be the same or different, which is not limited in this application. In addition, the reference relationship between each video frame can also be recorded in the code stream structure.

It should be noted that the concept of GOP is usually involved in the code stream structure. GOP (Group Of Picture, video group length) refers to a group of continuous video frames, that is, one I frame is followed by multiple P frames consecutively. The start frame of a GOP is the I frame, and the end frame is the previous frame (P frame) of the start frame (I frame) of the next GOP, where the I frame records a complete picture, and the P frame is a forward prediction Frame, which records changes relative to the previous frame (I frame or P frame). Usually the length of the I frame is the longest, and the lengths of the P frames belonging to different layers are different, but the lengths of the P frames belonging to the same enhancement layer are generally the same. In addition, a GOP may include multiple root reference frames (I frames or P frames), and the number of frames included between each two root reference frames is the same. The start frame of a GOP is the first root reference frame, and the previous The root reference frame is a reference frame of the next reference frame, and the root reference frames all belong to layer 0 of the code stream layer.

In an exemplary scenario, as shown in FIG. 2B , the code stream layers are layer 0 and layer 1, wherein layer 0 includes frame 0, frame 2, frame 4, frame 6, and frame 8, and layer 1 includes Frame 1, frame 3, frame 5, and frame 7, and frame 0 and frame 8 in the 0th layer are the root reference frames, and frame 8 uses frame 0 as the reference frame. In addition, the three video frames (frame 2, frame 4, and frame 6) that belong to layer 0 included between the two root reference frames all use the previous frame that belongs to layer 0 as the reference frame, and the video frames in layer 1 Each frame takes its previous frame as the reference frame. Therefore, the management server can divide two storage spaces (storage space 1 and storage space 2), layer 0 corresponds to storage space 1, and layer 1 corresponds to storage space 2.

In another exemplary scenario, as shown in FIG. 2C , the code stream layers are layer 0, layer 1, and layer 2, and layer 0 includes frame 0, frame 4, frame 8, frame 12, frame 16, and layer 1 Layer includes frame 2, frame 6, frame 10, frame 14, layer 2 includes frame 1, frame 3, frame 5, frame 7, frame 9, frame 11, frame 13, frame 15, and frame 0 in layer 0 And frame 16 is the root reference frame, and frame 16 uses frame 0 as the reference frame. In addition, the three video frames (frame 4, frame 8, and frame 12) that belong to layer 0 included between the two root reference frames all use the previous frame that belongs to layer 0 as the reference frame. Each video frame in a layer uses its previous frame as a reference frame. Therefore, the management server can divide three storage spaces (storage space 1 to storage space 3), layer 0 corresponds to storage space 1, layer 1 corresponds to storage space 2, and layer 2 corresponds to storage space 3.

Step 203: Store each video frame in the code stream sent by the video encoder in the storage space corresponding to the layer according to its layer; wherein, the priority and life cycle corresponding to the video frame stored in each storage space, It is negatively correlated with the number of layers it belongs to.

In one embodiment, due to the priority and life cycle corresponding to the video frames stored in each storage space, there is a negative correlation with the number of layers it belongs to, that is, the lower the number of layers, the priority of the video frames stored in the corresponding storage space. The lower the level, the lower the importance and the shorter the life cycle. Therefore, storing video frames belonging to different layers in different storage spaces can achieve flexible life cycle management of recordings.

In an exemplary scenario, as shown in FIG. 2B , frame 0, frame 2, frame 4, frame 6, and frame 8 included in the 0th layer can be sequentially stored in the storage space 1, and frames 1, Frame 8 included in the first layer, Frame 3, frame 5, and frame 7 can be stored in storage space 2 in sequence. Wherein, since the priority of the video frame of the 0th layer is higher than that of the video frame of the 1st layer, the corresponding life cycle of the video frame stored in the storage space 1 can be shorter, for example, 3 months, and the storage space 2 The life cycle corresponding to the video frames stored in can be longer, for example, 6 months. After 3 months, the video frames in storage space 1 can be directly discarded or directly overwritten. After 6 months, the storage space The video frames in 2 are directly discarded or directly overwritten.

It can be seen from the above embodiments that before storing the video recording of a certain video device, the management server can first obtain the code stream structure pre-configured in its video encoder, and record the code stream layer according to the obtained code stream structure as each layer Divide the corresponding storage space, and then store each video frame in the code stream sent by the video encoder in the corresponding storage space of the layer according to its layer, so that the code stream generated by the video encoder is layered For the purpose of storage, since the priority and life cycle of video frames stored in each storage space are negatively correlated with the number of layers to which they belong, each storage space can set a different life cycle according to the priority of its corresponding layer For management, when the life cycle of a video frame of a certain layer expires, the video frame in the corresponding storage space of the layer can be directly discarded or overwritten, without the need to dump the frame or reduce the bit rate. The storage space is read and written multiple times to realize video life cycle management, so the application can realize flexible life cycle management through layered storage, reducing the complexity of video life cycle management.

Fig. 3A is an embodiment flow chart of another video storage method shown in the present application according to an exemplary embodiment; Fig. 3B is a logic group and a logical unit shown in the present application according to the stream structure shown in Fig. 2B Partition diagram; FIG. 3C is a block space partition diagram of a storage space shown in the present application according to the logical group and logical unit structure shown in FIG. 3B; FIG. 3D is a block space partition diagram shown in the present application according to the code stream structure shown in FIG. 2C A division diagram of a logical group and a logical unit; FIG. 3E is a block space division diagram of a storage space shown in the present application according to the logical group and logical unit structure shown in FIG. 3D , and this embodiment uses the embodiment of the present application to provide The above-mentioned method, how to sequentially store each video frame in the code stream sent by the video encoder into the storage space corresponding to the layer according to the layer to which it belongs is exemplified as an example, as shown in Figure 3A, the video storage method Including the following steps:

Step 301: Obtain a pre-configured logical unit structure of a video encoder.

In an embodiment, the management server can perform logical division in the video encoder according to the configured code stream structure, that is, pre-configure the logical unit structure, and the logical unit structure can record the code stream layers included in the logical unit and the frames included in each layer number.

Step 302: Divide the code stream into logical units according to the logical unit structure, and each logical unit corresponds to the same time unit.

For the process of dividing the code stream into logical units according to the logical unit structure, the management server may divide the code stream into logical groups according to the number of frames included between two root reference frames recorded in the code stream structure, wherein each logic A group starts from a certain root reference frame of the 0th layer and ends at the previous frame of the next root reference frame of the 0th layer, and then for each logical group, the video frames included in the logical group according to the logical unit structure Divide logical units, wherein the number of frames included in the logical group is an integer multiple of the number of frames included in each logical unit, and the first frame in the previous logical unit is a reference frame for the first frame in the subsequent logical unit.

Wherein, since each logical group starts from a certain root reference frame of the 0th layer and ends at the previous frame of the next root reference frame of the 0th layer, a root reference frame (I frame) is included in each logical group or P frame), the root reference frame is the leading frame of the logical group, and other video frames (P frames) in the logical group can finally be decoded according to the root reference frame. Since the logical unit structure is the code stream layer included in the logical unit and the number of frames included in each layer, for each logical group, the logical unit can be divided according to the logical unit structure starting from the leading frame of the logical group, and the corresponding The time units are all the same.

It should be noted that a logical group includes only one root reference frame, and the root reference frame is the leading frame of the logical group, and a GOP can include multiple root reference frames, so the logical group and the GOP are not necessarily related, usually a Multiple logical groups can be included in a GOP.

Step 303: Obtain the maximum frame code stream length included in each layer from the code stream layer included in each logical unit and the frame code stream length included in each layer, and in the storage space corresponding to each layer, according to the maximum frame code stream included in the layer The code stream length divides the block space for each logical unit.

In one embodiment, in order to facilitate the calculation of the search position during video retrieval, the management server can divide the corresponding block space for each logical unit in the storage space, because some logical units include I frames, and some logical units do not It includes I frames, and the lengths of P frames belonging to different layers are also different. Therefore, the frame code stream lengths included in each divided logical unit cannot be the same. Among the frame code stream lengths included in each layer, the maximum frame code stream length included in each layer is obtained, and the maximum frame code stream length is used as the size of each block space in the corresponding storage space, so as to ensure that each layer included in each logical unit The video frames of can be completely stored in the block space of the corresponding storage space.

It should be noted that since the code stream structure can be obtained by encoding the video frames of a GOP, the management server obtains the maximum frame included in each layer from the code stream layers included in each logical unit and the frame code stream length included in each layer When the code stream length is used, the maximum frame code stream length included in each layer can be obtained from the code stream layers included in each logical unit belonging to a GOP and the frame code stream length included in each layer, or can also be obtained from the code stream lengths included in each layer of a GOP. From the code stream layer included in the first logical unit of the logical group and the frame code stream length included in each layer, the maximum frame code stream length included in each layer is obtained instead of being obtained from all the divided logical units to improve acquisition efficiency.

In an exemplary scenario, as shown in the code stream shown in FIG. 2B above, frame 0 and frame 8 are both root reference frames, the frame code stream length of frame 0 is M0 bytes, frame 2, frame 4, frame The frame code stream length of 6 is M1 byte, the frame code stream length of frame 1, frame 3, frame 5, and frame 7 is M2 byte, the logical unit structure is 0 layer and 1 layer, and the 0 layer includes 1 Frame, the first layer includes 1 frame, thus, can obtain logical group and logical unit division as shown in Fig. 3B, comprise 4 logical units (logical unit 0, logical unit 1 in the logical group (frame 0 to frame 7) , logical unit 2 and logical unit 3), logical unit 0 includes frame 0 and frame 1, logical unit 1 includes frame 2 and frame 3, logical unit 2 includes frame 4 and frame 5, and logical unit 3 includes frame 6 and frame 7. Because the length of the I frame is the longest, the frame code stream length M0 byte of the frame 0 of the 0th layer included in the logic unit 0 in the code stream structure is the largest, and because the length of the P frame of the 1st layer is M2 words Therefore, the maximum frame code stream length of the first layer included in each logical unit is M2 bytes, and then the block space division of the storage space as shown in Figure 3C is obtained, and the time unit corresponding to each logical unit is t seconds.

In another exemplary scenario, as another code stream shown in FIG. 2C above, frame 0 and frame 16 are both root reference frames, the frame code stream length of frame 0 is M3 bytes, and frame 4 and frame 8 , The frame code stream length of frame 12 is M4 bytes, the frame code stream length of frame 2, frame 6, frame 10, frame 14 is M5 bytes, frame 1, frame 3, frame 5, frame 7, frame 9 , Frame 11, Frame 13, and Frame 15 have a frame code stream length of M6 bytes. The logical unit structure is layer 0, layer 1, and layer 2. Layer 0 includes 1 frame, layer 1 includes 1 frame, and layer 1 includes 1 frame. Layer 2 includes 2 frames, thus, the logical group and logical unit division as shown in Figure 3D can be obtained, and the logical group (frame 0 to frame 15) includes 4 logical units (logical unit 0, logical unit 1, logical unit 2 and logical unit 3), logical unit 0 includes frames 0 to 3, logical unit 1 includes frames 4 to 7, logical unit 2 includes frames 8 to 11, and logical unit 3 includes frames 12 to 15. Because the length of the I frame is the longest, the frame code stream length M3 bytes of the frame 0 of the 0th layer included in the logic unit 0 in the code stream structure is the largest, and because the length of the P frame of the 1st layer is M3 bytes , so the maximum frame stream length of the first layer included in each logical unit is M5 bytes, and since the length of the P frame of the second layer is M6 bytes, the maximum length of the second layer included in each logical unit The length of the frame code stream is 2*M6, and then the block space division of the storage space as shown in FIG. 3E is obtained, and the time unit corresponding to each logical unit is t seconds.

Step 304: Store the video frames included in each logical unit in the corresponding block space of the corresponding storage space according to the layer they belong to.

It should be noted that, in order to quickly retrieve the storage location of the video and perform playback during video playback, the management server can determine the maximum frame code length included in each layer obtained in step 303 as the logical unit in the corresponding storage space The size of the space occupied by the logical unit, and record the space occupied by the determined logical unit in each storage space, the starting position of each storage space and the starting time of the code stream in the index list, when the retrieval command is received According to the start position of each storage space recorded in the index list, the space occupied by the logical unit in each storage space, and the start and end time of the retrieval video carried by the retrieval command, the start and end positions of the retrieval video in each storage space are obtained , and read the video frames in each storage space in parallel according to the obtained start and end positions in each storage space, and finally write the read video frames into the decoding buffer list according to the frame number, and send the decoding buffer list to the decoder, to enable the decoder to decode and play back. Since each storage space is physically separated, after obtaining the start and end positions in each storage space, the video frames in each storage space can be read in parallel, while in the prior art only one storage space In this way, the time delay of video retrieval and playback can be reduced.

Furthermore, the management server can also calculate the number of logical units included in the start and end time period according to the start and end time of the retrieved video carried by the retrieval instruction, and also calculate the position of a certain logic unit in each storage space, so that Fast retrieval and playback of video frames belonging to different layers that are stored in different storage spaces and that are closely adjacent in time and belong to the same logical unit can be realized.

In an exemplary scenario, as shown in FIG. 3C , assuming that the starting position of storage space 1 recorded in the index list is K1, the starting position of storage space 2 is K2, and the starting time of the code stream is T, the logic unit The space occupied in storage space 1 is M0 bytes, and the space occupied in storage space 2 is M2 bytes, and the time unit corresponding to the logic unit is t seconds. The start and end times are T-start and T-end, then the start and end positions of the retrieved video in storage space 1 are K1+(T-start-T)/t*M0 and K1+(T-end-T)/t*M0 respectively, The start and end positions in storage space 2 are K2+(T-start-T)/t*M2 and K2+(T-end-T)/t*M2 respectively, so that the start and end positions in storage space 1 can be read as K1+(T -start-T)/t*M0 and K1+(T-end-T)/t*M0 in the video frame and storage space 2 start and end positions are K2+(T-start-T)/t*M2 and K2+(T -end-T)/t*M2, and write the read video frame into the decoding buffer list according to the frame number and send it to the decoder, so that the decoder can decode and play back.

In addition, the management server can also calculate the number of logic units included in the start-end time period as m=(T-end-T-start)/t. The position of the nth (n<=m) logical unit in storage space 1 is K1+(T-start-T)/t*M0*n, and the position in storage space 2 is K2+(T-start-T) /t*M2*n.

It should be further explained that the management server can set a unit with a preset size at the head of each block in each storage space, and store the video frames included in each logical unit in the corresponding storage space according to the layer it belongs to. At the same time, the actual frame code stream length is stored in a unit of a preset size in the head of the block space. Therefore, for each storage space, the process of reading the video frames in the start and end position segments of the storage space, the management server may, for each storage space, store The actual frame code stream length reads the video frames in each block space to improve the reading efficiency.

It can be seen from the above embodiments that when the management server stores the code stream sent by the video encoder according to the layer, it can first obtain the logical unit structure pre-configured by the video encoder, and divide the code stream into logical units according to the logical unit structure, and each The time units corresponding to the logical units are the same, and then the maximum frame code stream length included in each layer is obtained from the code stream layers included in each logical unit and the frame code stream length included in each layer, and in the storage space corresponding to each layer, according to The maximum frame stream length included in this layer divides the block space for each logical unit, and finally stores the video frames included in each logical unit in the corresponding block space of the corresponding storage space according to its layer, so that the separated type can be realized through the logical unit storage. In addition, since each logical unit corresponds to a block space in each storage space, and each logical unit corresponds to the same time unit, it is convenient to quickly calculate the retrieval position during video retrieval.

Corresponding to the foregoing embodiment of the video storage method, the present application also provides an embodiment of a video storage device.

The embodiment of the video recording storage device of the present application can be applied on the management server. The device embodiments can be implemented by software, or by hardware or a combination of software and hardware. Taking software implementation as an example, as a device in a logical sense, it is formed by reading the corresponding computer program instructions in the non-volatile memory into the memory for operation by the processor of the device where it is located. From the perspective of hardware, as shown in FIG. 4, it is a hardware structure diagram of a management server according to an exemplary embodiment of the present application, except for the processor, memory, network interface, and non-volatile In addition to the non-volatile memory, the device where the device in the embodiment is located usually may also include other hardware according to the actual function of the device, which will not be repeated here.

FIG. 5 is a structural diagram of an embodiment of a video storage device according to an exemplary embodiment of the present application. The video storage device can be applied to a management server. As shown in FIG. 5 , the video storage device includes: an acquisition unit 51 , a division unit 52 , and a first storage unit 53 .

Wherein, the obtaining unit 51 is used to obtain the code stream structure pre-configured by the video encoder;

A division unit 52, configured to divide the corresponding storage space for each layer according to the code stream layer recorded in the code stream structure;

The first storage unit 53 is configured to sequentially store each video frame in the code stream sent by the video encoder into the storage space corresponding to the layer according to its layer;

Wherein, the priority and life cycle of video frames stored in each storage space are negatively correlated with the number of layers to which they belong.

In an optional implementation manner, the first storage unit 53 is specifically configured to acquire a pre-configured logical unit structure of the video encoder; divide the code stream into logical units according to the logical unit structure; wherein , each logical unit corresponds to the same time unit; obtain the maximum frame code stream length included in each layer from the code stream layer included in each logical unit and the frame code stream length included in each layer; in the storage space corresponding to each layer, according to The maximum frame code stream length included in this layer divides the block space for each logical unit; the video frames included in each logical unit are stored in the corresponding block space of the corresponding storage space according to the layer they belong to.

In an optional implementation manner, the first storage unit 53 is also specifically configured to, during the process of dividing the code stream into logical units according to the logical unit structure, record the two The number of frames included between the root reference frames divides the code stream into logical groups; wherein, each logical group starts from a certain root reference frame of the 0th layer and goes to the previous one of the next root reference frame of the 0th layer The frame ends; for each logical group, divide the video frame included in the logical group into logical units according to the logical unit structure; wherein, the number of frames included in the logical group is an integer multiple of the number of frames included in each logical unit, and the previous The first frame in a logical unit is the reference frame of the first frame in the next logical unit.

In an optional implementation, the device further includes (not shown in FIG. 5 ):

The recording unit is used to determine the obtained maximum frame code stream length included in each layer as the space size occupied by the logic unit in the corresponding storage space; the space size occupied by the determined logic unit in each storage space, each storage space The starting position of the space and the starting time of the code stream are recorded in the index list;

The retrieval playback unit is configured to, when a retrieval instruction is received, according to the starting position of each storage space recorded in the index list and the size of the space occupied by the logical unit in each storage space, the retrieval information carried by the retrieval instruction The start and end time of video recording, the time unit corresponding to the logical unit obtain the start and end position of retrieval video recording in each storage space; read the video frames in each storage space in parallel according to the obtained start and end position in each storage space; read the The video frame is written into the decoding buffer list according to the frame number, and the decoding buffer list is sent to the decoder, so that the decoder performs decoding and playback.

In an optional implementation manner, each block space header in each storage space is provided with a unit of a preset size, and the device further includes (not shown in FIG. 5 ):

The second storage unit is used to store the video frames included in each logical unit in the corresponding block space of the corresponding storage space according to the layer to which they belong, and at the same time store the actual frame code stream length in the preset of the head of the block space in units of size;

The retrieval and playback unit is specifically configured to, for each storage space, read the video frames in the start and end position segments of the storage space, for each storage space, according to each block in the start and end position segments of the storage space The actual frame code stream length stored in the head of the space reads the video frames in each space.

For the implementation process of the functions and effects of each unit in the above device, please refer to the implementation process of the corresponding steps in the above method for details, and will not be repeated here.

As for the device embodiment, since it basically corresponds to the method embodiment, for related parts, please refer to the part description of the method embodiment. The device embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in One place, or it can be distributed to multiple network elements. Part or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this application. It can be understood and implemented by those skilled in the art without creative effort.

The above is only a preferred embodiment of the application, and is not intended to limit the application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the application should be included in the application. within the scope of protection.

Claims (10)

1. a kind of videotape storage means, methods described is applied to management server, it is characterised in that methods described includes：

Obtain the code flow structure that video encoder is pre-configured with；

The bitstream layers recorded according to the code flow structure divide corresponding memory space for every layer；

Each frame of video in the video encoder transmitted stream is stored into this layer successively according to its affiliated layer corresponding to deposit Store up in space；

Wherein, the priority and life cycle of the frame of video stored in each memory space, with the number of plies belonging to it into negative correlation Relation.

2. according to the method described in claim 1, it is characterised in that it is described will be each in the video encoder transmitted stream Frame of video is stored in this layer of corresponding memory space successively according to its affiliated layer, including：

Obtain the logical unit structure that the video encoder is pre-configured with；

Logic unit division is carried out to the code stream according to the logical unit structure；Wherein, each logic unit corresponding time Unit is identical；

The every layer of largest frames included code stream is obtained in the frame code stream length that the bitstream layers included from each logic unit and every layer include Length；

In every layer of corresponding memory space, the largest frames code stream length included according to this layer is empty for each logic unit divided block Between；

The frame of video that each logic unit is included, according to its affiliated layer storage into the corresponding block space in respective stored space.

3. method according to claim 2, it is characterised in that described to be entered according to the logical unit structure to the code stream Row logic unit is divided, including：

The frame number included between the two root reference frames recorded according to the code flow structure divides logical groups to the code stream；Its In, each logical groups are since the 0th layer some root reference frame, to the former frame knot of the 0th layer of next reference frame Beam；

For each logical groups, logic unit is divided according to the frame of video that the logical unit structure includes to the logical groups；Its In, the frame number that the logical groups include is the first frame in the integral multiple for the frame number that each logic unit includes, and previous logic unit It is the reference frame of the first frame in latter logic unit.

4. method according to claim 2, it is characterised in that methods described also includes：

Every layer of the acquisition largest frames included code stream length is defined as the space that logic unit takes in respective stored space Size；

Space size, the original position of each memory space and the institute that the logic unit of determination is taken in each memory space The initial time for stating code stream recorded in index list；

When receiving search instruction, according to the original position and logic list of each memory space recorded in the index list The beginning and ending time for the retrieval video recording that first space size taken in each memory space, the search instruction are carried, logic list The corresponding time quantum of member obtains start-stop position of the retrieval video recording in each memory space；

The frame of video in each memory space is read parallel in start-stop position in each memory space of acquisition；

By the frame of video of reading according to frame number write-in decoding cache list, and the decoding cache list is sent to decoding Device, so that the decoder is decoded and played back.

5. method according to claim 4, it is characterised in that each block space head in each memory space is respectively provided with There is the unit of a default size, methods described also includes：

Stored in the frame of video for including each logic unit according to its affiliated layer into the corresponding block space in respective stored space Meanwhile, by the storage of its actual frame code stream length into the unit of the default size on the block space head；

It is described to be directed to each memory space, the frame of video in the start-stop position section of the memory space is read, including：

For each memory space, the actual frame code that each block space head in the section of the start-stop position of the memory space is stored Flow the frame of video in each block space of length reading.

6. one kind video recording storage device, described device is applied to management server, it is characterised in that described device includes：

Acquiring unit, for obtaining the code flow structure that video encoder is pre-configured with；

Division unit, the bitstream layers for being recorded according to the code flow structure are the corresponding memory space of every layer of division；

First memory cell, for each frame of video in the video encoder transmitted stream to be deposited successively according to its affiliated layer Store up in this layer of corresponding memory space；

Wherein, the priority and life cycle of the frame of video stored in each memory space, with the number of plies belonging to it into negative correlation Relation.

7. device according to claim 6, it is characterised in that

First memory cell, specifically for obtaining the logical unit structure that the video encoder is pre-configured with；According to institute State logical unit structure and logic unit division is carried out to the code stream；Wherein, the corresponding time quantum of each logic unit is identical；From The bitstream layers that each logic unit includes and obtain the every layer of largest frames included code stream length in the frame code stream length that every layer includes； In every layer of corresponding memory space, the largest frames code stream length included according to this layer divides block space for each logic unit；Will be each The frame of video that logic unit includes, according to its affiliated layer storage into the corresponding block space in respective stored space.

8. device according to claim 7, it is characterised in that

First memory cell, draws also particularly useful for according to the logical unit structure to code stream progress logic unit During point, the frame number included between the two root reference frames recorded according to the code flow structure divides logic to the code stream Group；Wherein, each logical groups are since the 0th layer of a certain reference frame, to the former frame of the 0th layer of next reference frame Terminate；For each logical groups, logic unit is divided according to the frame of video that the logical unit structure includes to the logical groups；Its In, the frame number that the logical groups include is the first frame in the integral multiple for the frame number that each logic unit includes, and previous logic unit It is the reference frame of the first frame in latter logic unit.

9. device according to claim 7, it is characterised in that described device also includes：

Recording unit, for every layer of the acquisition largest frames included code stream length to be defined as into logic unit in respective stored space The space size of middle occupancy；Space size, each memory space that the logic unit of determination is taken in each memory space Original position and the initial time of the code stream recorded in index list；

Playback unit is retrieved, for when receiving search instruction, according to each memory space recorded in the index list Original position and logic unit taken in each memory space space size, the search instruction carry retrieval video recording Beginning and ending time, the corresponding time quantum of logic unit obtain start-stop position of the retrieval video recording in each memory space；According to The frame of video in each memory space is read parallel in start-stop position in each memory space obtained；By the frame of video of reading according to Frame number write-in decoding cache list, and the decoding cache list is sent to decoder, so that the decoder is solved Code is simultaneously played back.

10. device according to claim 9, it is characterised in that each block space head in each memory space is all provided with The unit of a default size is equipped with, described device also includes：

Second memory cell, for arriving respective stored space according to its affiliated layer storage in the frame of video for including each logic unit Corresponding block space in while, by its actual frame code stream length storage into the unit of the default size on the block space head；

The retrieval playback unit, specifically for for each memory space, reading in the start-stop position section of the memory space Frame of video during, for each memory space, each block space head in the section of the start-stop position of the memory space is deposited The actual frame code stream length of storage reads the frame of video in each block space.