CN107968954B - Online live broadcast system - Google Patents
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- CN107968954B CN107968954B CN201610912522.8A CN201610912522A CN107968954B CN 107968954 B CN107968954 B CN 107968954B CN 201610912522 A CN201610912522 A CN 201610912522A CN 107968954 B CN107968954 B CN 107968954B
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Abstract
The embodiment of the invention provides an online live broadcast system, which comprises a live broadcast content acquisition device, a live broadcast content management device, a live broadcast content transmission device and a live broadcast content playing device, wherein the live broadcast content acquisition device is connected with the live broadcast content management device; the live broadcast content acquisition device is used for acquiring real-time images of live broadcast content and compressing the live broadcast content to generate compressed images with different alternative broadcast code rates; the live broadcast content management device is used for storing compressed images with different alternative broadcast code rates generated by compression, analyzing the access request to obtain the address and the actual broadcast code rate of the live broadcast content playing device, acquiring the compressed images with the alternative broadcast code rates consistent with the actual broadcast code rate from the address, decoding the compressed images to generate decoded images, and distributing the decoded images to the live broadcast content transmission device according to the address of the live broadcast content playing device; the live broadcast content transmission device is used for distributing the decoded image to the live broadcast content playing device; the live content playing device is used for sending the access request and receiving the decoding image distributed by the live content transmission device for playing.
Description
Technical Field
The embodiment of the invention relates to the technical field of online live broadcast, in particular to an online live broadcast system.
Background
The multimedia teaching refers to that in the teaching process, according to the characteristics of a teaching target and a teaching object, modern teaching media are reasonably selected and applied through teaching design and are organically combined with traditional teaching means to jointly participate in the whole teaching process, and various media information acts on students to form a reasonable teaching process structure so as to achieve the optimized teaching effect.
Along with the development of multimedia teaching technique, at the in-process of teaching, except using the whiteboard on the conventional meaning to write, still increased the projecting apparatus, will live the content and pass through the projecting apparatus and project on a soft curtain that hangs. All is decided by the teacher in the traditional teaching process. The practice from live broadcast content, teaching strategy, teaching method, teaching steps and even students is scheduled by teachers in advance, and students can only passively participate in the process, namely in an infused state. In an interactive learning environment such as a multimedia computer, students can select contents to be learned according to learning bases and learning interests of the students and can select exercises suitable for the students, and if teaching software is well programmed, a teaching mode can be selected, for example, an individual teaching mode or a consultation discussion mode can be used. That is, students have the potential to actively participate in such an interactive learning environment, rather than all being scheduled by the teacher, and students can only passively accept.
However, in the multimedia teaching process, because the resources of teachers are limited and the live content is often repeated, if one teacher is configured at each teaching point to teach the same live content, the teaching resources are wasted and the teaching cost is high, and therefore a teaching scheme is urgently needed to reduce the teaching cost.
Disclosure of Invention
In view of the above, one of the technical problems to be solved by the embodiments of the present invention is to provide an online live broadcasting system, so as to overcome the above-mentioned defects in the prior art.
The embodiment of the invention provides an online live broadcast system, which comprises: the system comprises a live broadcast content acquisition device, a live broadcast content management device, a live broadcast content transmission device and a live broadcast content playing device; the live broadcast content acquisition device is used for acquiring real-time images of live broadcast contents and compressing the live broadcast contents to generate compressed images with different alternative broadcast code rates; the live broadcast content management device is used for storing compressed images with different alternative broadcast code rates generated by compression, analyzing an access request to obtain an address and an actual broadcast code rate of the live broadcast content playing device, so as to obtain the compressed images with the alternative broadcast code rates consistent with the actual broadcast code rate, decoding the compressed images to generate decoded images, and distributing the decoded images to the live broadcast content transmission device according to the address of the live broadcast content playing device; the live content transmission device is used for distributing the decoded image to the live content playing device; and the live content playing device is used for sending the access request and receiving the decoding image distributed by the live content transmission device for playing.
According to the technical scheme, in the embodiment of the invention, the live broadcast content is subjected to real-time image acquisition by the live broadcast content acquisition device and is compressed to generate the compressed images with different alternative broadcast code rates; the live broadcast content management device stores compressed images with different alternative broadcast code rates generated by compression, analyzes an access request to obtain an address and an actual broadcast code rate of the live broadcast content playing device, so as to obtain the compressed images with the alternative broadcast code rates consistent with the actual broadcast code rates from the address and decode the compressed images to generate decoded images, and distributes the decoded images to the live broadcast content transmission device according to the address of the live broadcast content playing device; the live content transmission device distributes the decoded image to the live content playing device; the live broadcast content playing device sends the access request and receives the decoded image distributed by the live broadcast content transmission device for playing, if the live broadcast content playing device is suitable for online live broadcast education, a teacher is prevented from being configured for each teaching point, live broadcast content can be played simultaneously, and therefore the teaching cost is reduced. In addition, further, if the large-screen playing device is used, the real live broadcast scene can be simulated and reproduced, so that the immersive teaching effect is realized, students have real teaching experience, and teachers are simulated to give lessons in the classroom.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following descriptions are only some embodiments described in the embodiments of the present invention, and other drawings can be obtained by those skilled in the art according to these drawings.
Fig. 1 is a schematic structural diagram of an online live broadcast system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a first motherboard according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of an online live broadcast system in a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of an online live broadcast system in the fourth embodiment of the present invention;
fig. 5 is a schematic structural diagram of a projection apparatus according to a fifth embodiment of the invention;
FIG. 6 is a schematic structural diagram of a reflective edge in a reflective layer according to a sixth embodiment of the present invention;
FIG. 7 is a schematic structural diagram of multiple sets of light-reflecting layers according to a seventh embodiment of the present invention;
fig. 8 is a schematic structural diagram of a projection apparatus according to an eighth embodiment of the present invention;
FIG. 9 is a schematic structural diagram of a projection apparatus according to a ninth embodiment of the present invention;
fig. 10 is a schematic structural view of a light-reflecting edge in a light-reflecting layer in an embodiment of the invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention shall fall within the scope of the protection of the embodiments of the present invention.
In the embodiment of the invention, live content is subjected to real-time image acquisition and compressed by the live content acquisition device to generate compressed images with different alternative playing code rates; the live broadcast content management device stores compressed images with different alternative broadcast code rates generated by compression, analyzes an access request to obtain an address and an actual broadcast code rate of the live broadcast content playing device, so as to obtain the compressed images with the alternative broadcast code rates consistent with the actual broadcast code rates from the address and decode the compressed images to generate decoded images, and distributes the decoded images to the live broadcast content transmission device according to the address of the live broadcast content playing device; the live content transmission device distributes the decoded image to the live content playing device; the live broadcast content playing device sends the access request and receives the decoded image distributed by the live broadcast content transmission device for playing, if the live broadcast content playing device is suitable for online live broadcast education, a teacher is prevented from being configured for each teaching point, live broadcast content can be played simultaneously, and therefore the teaching cost is reduced. In addition, further, if the large-screen playing device is used, the real live broadcast scene can be simulated and reproduced, so that the immersive teaching effect is realized, students have real teaching experience, and teachers are simulated to give lessons in the classroom.
Fig. 1 is a schematic structural diagram of an online live broadcast system according to a first embodiment of the present invention; as shown in fig. 1, in this embodiment, the online live system includes: a live content acquisition device 101, a live content management device 102, a live content transmission device 103, and a live content playing device 104; the live broadcast content acquisition device 101 is used for acquiring real-time images of live broadcast contents and compressing the live broadcast contents to generate compressed images with different alternative broadcast code rates; the live broadcast content management device 102 is configured to store compressed images with different alternative broadcast bit rates generated by compression, and analyze an access request to obtain an address and an actual broadcast bit rate of the live broadcast content playing device, so as to obtain a compressed image with an alternative broadcast bit rate consistent with the actual broadcast bit rate, decode the compressed image to generate a decoded image, and distribute the decoded image to the live broadcast content transmission device 103 according to the address of the live broadcast content playing device; the live content transmission device 103 is used for distributing the decoded image to the live content playing device 104; the live content playing device 104 is configured to send the access request and receive the decoded image for playing.
In this embodiment, the live content collecting apparatus 101 may specifically include: the system comprises a camera 111 and a first main board 121, wherein the camera 111 is connected with the first main board 121, and the camera 111 is used for acquiring real-time images of live broadcast contents and sending the acquired real-time images to the first main board 121; the first main board 121 is configured to compress the acquired real-time image to generate a compressed image with different alternative playing code rates.
In this embodiment, the first main board 121 is further configured to segment the collected real-time images according to different alternative playing code rates to generate compressed images corresponding to the alternative playing code rates, and segment the collected real-time images into smaller data packets, so as to increase transmission efficiency during transmission, thereby reducing delay of the images during playback of the live content, for example, there is a delay of about 7 seconds from the live content collection device 101 to the live content playback device 104 in the prior art, whereas there is a delay of about 3 seconds in this embodiment, and the delay time is greatly reduced.
In the embodiment, a camera is adopted instead of a camera which has complex functions but is not suitable for recording teaching resources, the parameter modulation is simpler, and the cost is lower. The camera may be a digital camera or an analog camera, and if the camera is a digital camera, the analog video signal is converted into a digital signal and sent to the first main board 121. If the camera is an analog camera, the analog video signal is sent to the first main board 121, and the first main board 121 performs analog-to-digital conversion and compression. The camera can be made of CMOS or CCD, and detailed description is omitted. The analog video signal or the digital video signal is transmitted to the first main board 121 through a serial, parallel or USB interface.
Fig. 2 is a schematic structural diagram of a first motherboard according to a second embodiment of the present invention; as shown in fig. 2, in the present embodiment, the first main board 121 includes: a variable word length hardware encoding circuit 1211, a mixing circuit 1212, a buffer circuit 1213, a quantization circuit 1214, a discrete cosine transform circuit 1215, and an adding circuit 1216, which are connected with each other as shown in fig. 2, wherein:
the variable-word-length hardware coding circuit 1211 is configured to segment the effective real-time image according to different alternative playback code rates to generate a compressed image corresponding to the alternative playback code rates. Specifically, in this embodiment, the variable-word-length hardware encoding circuit 1211 is configured to segment an effective real-time image according to a first alternative playing code rate, a second alternative playing code rate, and a third alternative playing code rate, respectively, to generate a corresponding compressed image, where the first alternative playing code rate is suitable for a large-screen playing device (for example, a large-screen television with a size of 140 inches or more), the second alternative playing code rate is suitable for a PC, and the third alternative playing code rate is suitable for a portable mobile terminal device. For example, the first alternative playback code rate may be 8k, the second alternative playback code rate may be 4k, and the third alternative playback code rate is 2k. The structure of the variable-word-length hardware coding circuit may specifically include a plurality of semiconductor devices such as triodes, and the plurality of triodes form shifters, so that the effective real-time image is respectively split according to the alternative playing code rates of different playing requesters to generate a compressed image corresponding to the alternative playing code rates.
It should be noted that, the large-screen playing device, the PC, and the portable mobile terminal device serve as different playing requesters, and the corresponding first alternative playing code rate, second alternative playing code rate, and third alternative playing code rate may also be the same, which is determined specifically with reference to the playing requirements of the playing requesters, and are not described in detail again.
The hybrid circuit is used for carrying out redundancy processing on the image frames of the acquired real-time images, and rearranging the redundant processed image frames after adding the time stamps to the redundant processed image frames to obtain the effective real-time images. Specifically, the hybrid circuit 1212 may be built by a CMOS fet and will not be described in detail.
The buffer circuit 1213 is used for buffering the real-time image collected by the camera, so as to perform lag statistics on the real-time image and further avoid the pause in playing the compressed image. In this embodiment, the buffer circuit 1213 may include a plurality of diodes, transistors, and a power supply, which are not described in detail.
The quantization circuit 1214 is used for discretizing the real-time image after the segmentation processing to obtain a video group of the real-time image, in the embodiment, the quantization circuit is a multi-value logic (MVL) -based circuit, taking a four-value quantization circuit as an example, the circuit is composed of six RTDs (RTD 1-RTD 6) which are connected in series, and source and drain electrodes of the HEMT are connected in parallel with three of the HEMT (RTD 1, RTD2 and RTD 3).
And the discrete cosine transform circuit 1215 is used for performing two-dimensional wave conversion on the video group of the real-time image so as to compress the segmented real-time image in a two-dimensional wave superposition mode. Specifically, the discrete cosine transform circuit may structurally include an input memory and an output memory, a register table for buffering a real-time image to be processed, a demultiplexer for transposing the real-time image, a first multiplexer, a second multiplexer, a control unit for controlling a real-time image processing flow, a clock module for generating a clock signal, and a discrete cosine transform/inverse discrete cosine transform unit, where the input memory, the first multiplexer, the register table, the demultiplexer, the discrete cosine transform/inverse discrete cosine transform unit, the second multiplexer, and the output memory are connected in sequence; the discrete cosine transform/inverse discrete cosine transform unit comprises a register, a first sum and difference operation unit for carrying out sum or difference operation on the real-time image of the register once, and a second sum and difference operation unit for carrying out sum or difference operation twice after shifting the real-time image of the register in sequence, wherein the input end and the output end of the first sum and difference operation unit and the input end and the output end of the second sum and difference operation unit are connected with the register, and the register is also connected with a demultiplexer and a second multiplexer respectively.
The adder circuit 1216 is configured to compare the video group of the real-time image after the two-dimensional wave conversion with the acquired real-time image to obtain an add-subtract image frame, so as to generate a compressed image corresponding to the alternative playback code rate. In this embodiment, the Adder circuit may be any one of a serial Carry Adder Circuit (CRA), a Carry skip Adder Circuit (CKA), and a higher-speed Carry select Adder Circuit (CSA), a Carry look-ahead Adder Circuit (CLA), and a Parallel prefix Adder circuit (Parallel prefix Adder). The addition circuit may be implemented by a multiplexer and a related switching device, and details thereof are not repeated.
Fig. 3 is a schematic structural diagram of an online live broadcast system in the third embodiment of the present invention; as shown in fig. 3, different from the foregoing embodiment, the live content management apparatus 102 includes a second main board 112, where the second main board 112 is configured to access a request to analyze the address and the actual playing code rate of the live content playing apparatus, so as to obtain a compressed image with an alternative playing code rate consistent with the actual playing code rate, decode the compressed image to generate a decoded image, and dispatch the decoded image to the live content transmission apparatus according to the address of the live content playing apparatus. In this embodiment, specifically, the second main board 112 is further configured to decode the distributed compressed image with the first alternative playing code rate to generate a first decoded image.
In this embodiment, the live content transmission device 103 specifically includes a router 113, and the router is configured to route the decoded image to the live content playing device 104. In order to adapt to the situation that when a large-screen playing device plays, for example, a large-screen television with the size of at least 140 inches, the situation that the data size analyzed during playing is relatively large is avoided, therefore, a first decoded image decoded by the live content management device is routed to the large-screen playing device through a router, and the first decoded image is directly played by the large-screen playing device, so that the playing fluency is guaranteed. In addition, due to the large-screen playing device, the equal-proportion image playing of the live video during recording can be realized as far as possible, namely, the live video of the recorded live broadcast content is restored as far as possible, so that the experience of simulating a real live broadcast scene, namely, the immersive experience or the integrated experience is provided, and the reality degree of live broadcast is increased.
The second main board is further configured to decode the dispatched compressed image with the second alternative playing code rate to generate a second decoded image with the second alternative playing code rate, and decode the dispatched compressed image with the third alternative playing code rate to generate a third decoded image with the third alternative playing code rate; in this embodiment, when the requesting party is a PC or a portable mobile terminal, since the actual playback bit rate is small, the second decoded image and the third decoded image are directly transmitted to the PC or the portable mobile terminal via a wide area network such as the internet to be played back without using the router.
Further, in this embodiment, the live content management apparatus 102 further stores a routing table, and the router routes the first decoded image to the large-screen playing device according to the routing table.
Further, the live content management device 102 further stores a distribution policy, obtains an address, an actual playing code rate, and a distribution time of a first decoded image of the live content playing device according to the analysis of the distribution policy and the access request, obtains a compressed image from which the first alternative playing code rate is consistent with the actual playing code rate, transmits the compressed image to the second main board for decoding to generate a first decoded image, and distributes the first decoded image to the live content transmission device according to the address of the live content playing device and the distribution time of the first decoded image, where the distribution policy includes the distribution time of the first decoded image.
Fig. 4 is a schematic structural diagram of an online live broadcast system in the fourth embodiment of the present invention; as shown in fig. 4, it includes: the live broadcast content management system comprises a live broadcast content acquisition device 101, a live broadcast content transmission device 103 and a live broadcast content playing device 104, and is different from the above embodiment in that the live broadcast content management device 102 is a remote server and is also labeled as a remote server 102, the remote server is connected with the live broadcast content acquisition device 101 through the internet, a memory is arranged on the remote server, and compressed images with different alternative playing code rates, which are generated by compression, are transmitted and stored on the memory through the internet. The live broadcast content management device 102 stores a distribution strategy, the live broadcast content management device 102 analyzes the distribution strategy and the access request to obtain an address, an actual play code rate and distribution time of a first decoded image of the live broadcast content play device, obtains a compressed image with a first alternative play code rate and transmits the compressed image to the second mainboard for decoding to generate the first decoded image, and the distribution strategy comprises the distribution time of the first decoded image.
For example, for a teaching scene, a live broadcast content playing device makes a distribution strategy according to a live broadcast time point and a content to be live broadcast at the time point, and a live broadcast content management device obtains and analyzes the distribution strategy, so that when the time reaches the time point, a compressed image with a first alternative broadcast code rate consistent with an actual broadcast code rate of the large-screen playing device is obtained in real time and transmitted to the second main board for decoding so as to be played online, and the first decoded image is specifically routed to the large-screen playing device through the router for playing. Compared with the prior art, the method saves the tedious operation steps that a teacher needs to log in the server to perform identity verification and the like, and further provides convenience for online teaching.
For online teaching of live broadcast through a network school, a live broadcast content playing device and a router can be arranged in each classroom, and the live broadcast content playing device and the router are paired to work when teaching content is played directly.
In this embodiment, for a PC and a portable mobile terminal, the real-time performance of live broadcasting is not absolutely required, so that the second main board decodes the dispatched compressed image with the second alternative playback code rate to generate a second decoded image with the second alternative playback code rate, and decodes the dispatched compressed image with the third alternative playback code rate to generate a third decoded image with the third alternative playback code rate; after analyzing the access request of the PC and the portable mobile terminal, the second decoding image and the third decoding image are transmitted to the PC or the portable mobile terminal for playing through a wide area network such as the Internet.
Fig. 5 is a schematic structural diagram of a projection apparatus according to a fifth embodiment of the invention; as shown in fig. 5, the projection apparatus is used as a large screen playing apparatus, and the projection apparatus is an orthographic projection apparatus, and specifically includes: the curtain comprises a light source 114, a curtain 124 and a projector 134, wherein the light source 114 and the projector 134 are arranged on the front face of the curtain 124, the light source 114 is arranged on the ceiling, the projector 134 is arranged on the ground, and the projected light of the projector projects a received decoded image on the front face of the curtain from the lower part to the upper part obliquely; the curtain 124 includes a reflective layer (not shown in the figure) for reflecting the light emitted from the light source 114 into the surface of the curtain from the top to the oblique bottom, and the reflective layer enables the light emitted from the light source 114 to be emitted from the oblique top and enter the ceiling direction, and reflects the light emitted from the projector 134 into the surface of the curtain 124 from the oblique top, and the reflective layer enables the light emitted from the projector 134 to tend to be emitted to the front of the curtain, so that the whole curtain 124 presents a uniform light effect.
In this embodiment, the longitudinal installation position of the projector 103 is arranged with reference to the lower edge of the curtain, for example, the projection angle is projected onto the curtain 124 from top to bottom, the longitudinal installation position of the projector 103 is arranged with reference to the lower edge of the curtain 124, and the distance is 20CM. The distance can be flexibly adjusted in various different occasions. In the above embodiment, the projector 103 uses a laser projector to maintain a long operating life without dimming the screen brightness due to long-term operation; the wide color gamut is ensured and is about 2 times of the color gamut of a common projector.
For example, in a classroom, a plurality of light sources 114 are provided on a ceiling of the classroom, the plurality of light sources 114 are provided in a plurality of rows, each row includes a plurality of light sources, the light sources in the same row are brightness-controlled by the same brightness adjustment switch, and the light sources are arranged on an installation surface in a plurality of rows in such a manner that incident light is emitted obliquely from top to bottom. The row spacing between the light sources 114 in adjacent rows is 40-50cm, and the column spacing between the light sources 101 in the same row is 30-40cm.
FIG. 6 is a schematic structural diagram of a reflective edge in a reflective layer according to a sixth embodiment of the present invention; as shown in fig. 6, each light reflecting layer includes a first light reflecting surface 1241 and a first light reflecting surface 1242, the first light reflecting surface reflects the light emitted from the light source to the surface of the curtain from top to bottom obliquely upward, and the second light reflecting surface reflects the light emitted from the projector from bottom to top obliquely upward when the projector projects content.
In this embodiment, the overall shape of the reflective layer is a right triangle, but it should be noted that the overall shape of the reflective layer may also be other shapes, which is not described in detail.
FIG. 7 is a schematic structural diagram of multiple sets of light-reflecting layers according to a seventh embodiment of the present invention; as shown in fig. 7, a plurality of reflection layers that the reflection layer includes divide into the multiunit for example 3 groups, include the same a plurality of reflection layers of specification in the same reflection layer group, the inclination of the first reflection face of all reflection layers in same reflection layer group and second reflection face is identical completely promptly, and from the whole, the area of the first reflection face of reflection layer between the reflection layer group from the top down along the curtain decreases progressively, the area of second reflection face increases progressively, the contained angle of first reflection face and horizontal plane reduces, the contained angle of second reflection face and horizontal plane increases.
In the embodiments shown in fig. 4 to 7, a base layer is further disposed below the reflective layer, the base layer includes, from top to bottom, a protective layer, a diffusion layer, a light guide layer, a support layer, a polyurethane coating, and a fabric layer, the protective layer, the diffusion layer, the light guide layer, the support layer, the polyurethane coating, and the fabric layer are integrated into a whole by hot pressing, the fabric layer serves as a base layer, and the support layer and the polyurethane coating increase the overall rigidity of the reflective layer. In the protective layer, the diffusion layer, the light guide layer, the support layer, the polyurethane coating and the fabric layer, the thickness of each layer is 0.01-0.15 mm.
Fig. 8 is a schematic structural diagram of a projection apparatus according to an eighth embodiment of the present invention; as shown in fig. 8, the projection apparatus is a rear projection apparatus, and like the embodiment of fig. 4, includes: a light source 114, a curtain 124, and a projector 134, wherein the light source 114 is disposed on the front side of the curtain, the light source 114 is disposed on the ceiling, and unlike the embodiment of fig. 4, the projector 134 is disposed on the back side of the curtain 124, and projects the received decoded image onto the front side of the curtain 124 along the projection light from the top to the bottom; the front surface layer of the curtain 124 is a reflective layer, and the reflective layer is used for reflecting the light, which is irradiated from the light source 114 from top to bottom to the front surface of the curtain 124, to the ceiling obliquely upward.
This embodiment, still set up the basic unit under the reflector layer, basic unit from the top down includes protective layer, diffuse layer, leaded light layer, protective layer, diffuse layer, leaded light layer form integratively through the hot pressing. In the protective layer, the diffusion layer and the light guide layer, the thickness of the protective layer and the diffusion layer is 0.01 mm-0.15 mm, and the thickness of the light guide layer is 0.02 mm-0.30 mm.
FIG. 9 is a schematic diagram of a projection apparatus according to a ninth embodiment of the present invention; as shown in fig. 9, unlike the above fig. 8, a light reflecting plate 135 is added, and light projected by the projector 134 is reflected and projected on the curtain 124, thereby shortening the projection distance, and other parts are the same as those described in fig. 8 and are not described again.
Fig. 10 is a schematic structural view of a light-reflecting edge in a light-reflecting layer in an embodiment ten of the present invention; as shown in fig. 10, each light reflecting edge includes a first light reflecting surface 1241 that reflects the light emitted from the light source 114 from the top to the oblique lower side to the surface of the curtain 124 upward to the ceiling, and a second refraction surface 1243 that refracts the light emitted from the projector 134 from the bottom to the oblique upper side when projecting content and collects the light in the field of view of the user on the front side of the curtain 124.
In this embodiment, the overall shape of the reflective layer is a right triangle, but it should be noted that the overall shape of the reflective layer may also be other shapes, which is not described in detail.
Referring to fig. 7, the plurality of reflective layers included in the reflective layer are divided into a plurality of groups, for example, 2 groups, and the same reflective layer group includes a plurality of reflective layers with the same specification, that is, the inclination angles of the first reflective surfaces and the second reflective surfaces of all reflective layers in the same reflective layer group are completely the same, and as a whole, the area of the first reflective surface of the reflective layer decreases progressively along the curtain 124 from top to bottom, the area of the second reflective surface increases progressively, the included angle between the first reflective surface and the horizontal plane decreases, and the included angle between the second reflective surface and the horizontal plane increases.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus (device), or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (devices) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the true scope of the embodiments of the present invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the embodiments of the present invention and their equivalents, the embodiments of the present invention are also intended to encompass such modifications and variations.
Claims (18)
1. An online live system, comprising: the system comprises a live broadcast content acquisition device, a live broadcast content management device, a live broadcast content transmission device and a live broadcast content playing device; the live broadcast content acquisition device is used for acquiring real-time images of live broadcast contents and compressing the live broadcast contents to generate compressed images with different alternative broadcast code rates; the live broadcast content management device is used for storing compressed images with different alternative broadcast code rates generated by compression, analyzing an access request to obtain the address and the actual broadcast code rate of the live broadcast content playing device, obtaining the compressed images with the alternative broadcast code rates consistent with the actual broadcast code rates from the address and decoding the compressed images to generate decoded images, and distributing the decoded images to the live broadcast content transmission device according to the address of the live broadcast content playing device; the live content transmission device is used for distributing the decoding image to the live content playing device; the live broadcast content playing device is used for sending the access request and receiving the decoding image distributed by the live broadcast content transmission device for playing;
the live broadcast content playing device comprises a projection device, a curtain of the projection device comprises a reflecting layer, and the reflecting layer comprises a plurality of reflecting edges;
if the projection device is an orthographic projection device, the reflecting edge comprises a first reflecting surface and a second reflecting surface, the first reflecting surface is used for reflecting light rays emitted from a light source to the surface of the curtain from top to bottom obliquely and emitting the reflected light rays obliquely upwards, and the second reflecting surface is used for reflecting light rays emitted from a projector to the surface of the curtain from bottom to top obliquely and emitting the reflected light rays towards the front of the curtain;
or, projection arrangement is rear projection arrangement, then reflection of light arris includes first reflection of light face and the second refraction face, first reflection of light face be used for with light source from the top down is penetrated to oblique below the light on curtain surface reflects, and reflection light jets out along the top that inclines, and the second refraction face is used for making the projecting apparatus jets into from the top to the top that inclines the light on curtain back surface refracts, and the light after its refraction tends to jet out in curtain the place ahead.
2. The system of claim 1, wherein the live content capture device comprises: the camera is connected with the first main board and used for acquiring real-time images of live broadcast contents and sending the acquired real-time images to the first main board; the first main board is used for compressing the collected real-time images to generate compressed images with different alternative playing code rates.
3. The system of claim 2, wherein the first motherboard is further configured to split the collected real-time image according to different alternative playback code rates to generate a compressed image corresponding to the alternative playback code rates.
4. The system according to claim 3, wherein the first motherboard is provided with a variable word length hardware coding circuit, and the variable word length hardware coding circuit is configured to segment the acquired real-time image according to different alternative playback code rates to generate a compressed image corresponding to the alternative playback code rates.
5. The system according to claim 4, wherein a hybrid circuit is disposed on the first motherboard, and the hybrid circuit is configured to perform redundant processing on the image frames of the acquired real-time images, and re-time-stamp the redundant image frames and re-rearrange the redundant image frames to obtain valid real-time images;
the variable word length hardware coding circuit is further used for respectively segmenting the effective real-time image according to different alternative playing code rates so as to generate a compressed image corresponding to the alternative playing code rates.
6. The system according to claim 3, wherein a buffer circuit is further disposed on the first motherboard, and the buffer circuit is configured to buffer the real-time images collected by the camera, so as to perform a lag statistic of the real-time images and avoid a pause in playing the compressed images.
7. The system according to claim 3, wherein a quantization circuit is further disposed on the first main board, and is configured to discretize the real-time image after the segmentation process, so as to obtain a video group of the real-time image.
8. The system according to claim 7, wherein a discrete cosine transform circuit is further disposed on the first main board, and is configured to perform two-dimensional wave conversion on the video group of the real-time image, so as to compress the sliced real-time image in a two-dimensional wave overlapping manner.
9. The system according to claim 8, wherein an adding circuit is further disposed on the first main board, and the adding circuit is configured to compare the video group of the real-time image after the two-dimensional wave conversion with the acquired real-time image to obtain an add-subtract image frame, so as to generate a compressed image corresponding to the alternative playing code rate.
10. The system of claim 1, wherein the live content management device is a remote server, the remote server is connected to the live content acquisition device via the internet, a memory is provided on the remote server, and compressed images with different alternative playback bit rates generated by compression are transmitted and stored on the memory via the internet.
11. The system according to claim 10, wherein the live content management apparatus further comprises a second main board, and the second main board is configured to parse the access request to obtain an address and an actual play code rate of the live content playing apparatus, to obtain a compressed image with an alternative play code rate consistent with the actual play code rate, decode the compressed image to generate a decoded image, and dispatch the decoded image to the live content transmission apparatus according to the address of the live content playing apparatus.
12. The system of claim 11, wherein the live content transmission device comprises a router configured to route the decoded images to the live content playback device.
13. The system of claim 12, wherein the compressed images comprise compressed images with a first alternative playout rate, compressed images with a second alternative playout rate, and compressed images with a third alternative playout rate.
14. The system of claim 13, wherein the second motherboard is further configured to decode the served compressed image with the first alternative playback rate to generate a first decoded image, wherein the router is configured to route the first decoded image to a large-screen playback device, wherein the live content playback apparatus comprises the large-screen playback device, and the large-screen playback device is the projection apparatus.
15. The system of claim 13, wherein the second motherboard is further configured to decode the dispatched compressed image with the second alternative playback rate to generate a second decoded image, and decode the dispatched compressed image with the third alternative playback rate to generate a third decoded image; and the second decoded image and the third decoded image are transmitted to a PC (personal computer) or a portable mobile terminal through a wide area network, the live broadcast content playing device comprises the PC or the portable mobile terminal, the actual playing code rate of the PC is consistent with the second alternative playing code rate, and the actual playing code rate of the portable mobile terminal is consistent with the third alternative playing code rate.
16. The system of claim 14, wherein the live content management device further stores a routing table, and wherein the router routes the first decoded image to the large screen playback device according to the routing table.
17. The system according to claim 14, wherein a distribution policy is further stored on the live content management device, an address, an actual playing bit rate, and a distribution time of a first decoded image of the live content playing device are obtained according to the analysis of the distribution policy and the access request, so as to obtain a compressed image from which the first candidate playing bit rate is consistent with the actual playing bit rate, and transmit the compressed image to the second main board for decoding to generate a first decoded image, and the first decoded image is distributed to the live content transmission device according to the address of the live content playing device and the distribution time of the first decoded image, where the distribution policy includes the distribution time of the first decoded image.
18. The system of claim 14, wherein the large-screen playback device comprises a large-screen playback device having a size of at least 140 inches.
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| CN201610912522.8A CN107968954B (en) | 2016-10-19 | 2016-10-19 | Online live broadcast system |
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| CN201610912522.8A CN107968954B (en) | 2016-10-19 | 2016-10-19 | Online live broadcast system |
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| CN112203106B (en) * | 2020-10-10 | 2023-03-31 | 深圳市捷视飞通科技股份有限公司 | Live broadcast teaching method and device, computer equipment and storage medium |
| WO2023000133A1 (en) * | 2021-07-19 | 2023-01-26 | 深圳爱特天翔科技有限公司 | Internet livestreaming system |
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