CN117061813A - Media playback method and related media playback device - Google Patents

Abstract

Various embodiments of the present invention relate to media playback methods and related media playback devices. A method for media playback on a media playback device, including: receiving a data stream, caching the data stream in a cache unit, or recording it in a storage unit; and performing operations on the cached or recorded data stream. A parsing operation to obtain the frame time and data offset corresponding to one or more intra-frame pictures of at least one audio-visual content contained in the data stream; according to the frame time corresponding to the one or more intra-frame pictures and data offset, construct a frame index table; in response to a playback operation, refer to the frame index table to determine a data offset corresponding to the playback operation; obtain the cache unit or the storage unit according to the data offset one or more data units in; and decoding the one or more data units for media playback.

Description

Media playback method and related media playback device

Technical field

The present invention relates to media playback, and in particular, to a media playback method and related media playback device that accelerates playback response by parsing a data stream in advance.

Background technique

Generally speaking, a multimedia container (Multimedia container) contains index information, which can indicate the association between the specific playback time and the data structure of the encapsulated multimedia content. However, the multimedia playback device must start parsing the index information from the starting point of the multimedia content until it is close to the target playback time before it can parse out which data unit the specific multimedia content corresponding to the target playback time is stored in. However, in today's video coding technology, the Group of pictures (GOP) is often based on the IBP arrangement structure (i.e., I frame, B frame and P frame), without obtaining Intra Pictures (Intra Pictures) ( That is, the multimedia playback device cannot completely decode the video content before the data unit of the I frame. The multimedia playback device must wait until a data unit containing a complete intra-frame picture is obtained before the video content can be decoded by the multimedia playback device. This greatly limits the response speed of the multimedia playback device to the user's search, jump, fast forward or rewind playback operations. In this way, it is easy for users to feel the delay in the transition of audio-visual content. Therefore, there is a need in this field for a technology that solves the playback response delay, thereby improving user experience.

Contents of the invention

In view of this, the present invention provides a media playing method and a related media playback device. In the present invention, when the media playback device receives a data stream containing audio-visual content, it pre-analyzes the cached data stream and analyzes the frame time and data corresponding to the intra-frame pictures of the audio-visual content in the data stream. offset information. Based on this information, the present invention will further construct a frame index table. After that, if the user wants to play back the audio-visual content, the present invention will load the constructed frame index table, and when the user performs a specific playback control operation, the frame index table will be searched to quickly determine the data unit to which the picture in the frame belongs. storage location, thereby obtaining the data unit for decoding and playback. The present invention effectively improves the response speed of the media playback device to the user's playback control operation through the frame index table.

An embodiment of the present invention provides a method for media playback on a media playback device. The method includes: receiving a data stream on the media playback device, and caching the data stream in a buffer in the media playback device. unit, or a storage unit recorded in the media playback device; perform a parsing operation on the buffered or recorded data stream to obtain one or more intra-frame pictures of at least one audio-visual content contained in the data stream The corresponding frame time and data offset. Construct a frame index table corresponding to the audio-visual content according to the frame time and data offset respectively corresponding to the one or more intra-frame pictures; in response to a playback operation of the audio-visual content, refer to the frame index table to determine the A data offset corresponding to the playback operation; obtaining one or more data units in the cache unit or the storage unit according to the data offset; and decoding the one or more data units for media playback.

An embodiment of the present invention provides a media playback device. The media playback device includes: a receiving and buffering circuit, a parsing and decoding circuit, an index table construction circuit and a playback control circuit. The receiving and buffering circuit is used to receive a data stream and cache the data stream in a buffer unit. The parsing and decoding circuit is coupled to the receiving and caching circuit, and is used to perform a parsing operation on the buffered data stream, or the data stream recorded in a storage unit, to obtain at least the data stream contained in the data stream. The frame time and data offset corresponding to one or more intra-frame pictures of an audio-visual content. The index table construction circuit is coupled to the parsing and decoding circuit, and is used to construct a frame index table corresponding to the audio-visual content based on the frame time and data offset respectively corresponding to the one or more intra-frame pictures. The playback control circuit is used to respond to a playback operation of the audio-visual content, refer to the frame index table to determine a data offset corresponding to the playback operation, and obtain the cache unit or the storage unit according to the data offset. one or more data units. Wherein, the parsing and decoding circuit is also used to decode the one or more data units for media playback.

Description of the drawings

FIG. 1 is an architectural diagram of a media playback device according to an embodiment of the present invention.

FIG. 2 is an architectural diagram of a receiving and buffering circuit in a media playback device according to an embodiment of the present invention.

3A and 3B show a frame index table according to an embodiment of the present invention.

Figure 4 shows the association between the data unit to which the frame belongs and the data offset in the embodiment of the present invention.

Figure 5 is a flow chart of a media playback method according to an embodiment of the present invention.

FIG. 6 shows an architecture diagram of a device for implementing one or more circuit elements or modules in an embodiment of the present invention.

Detailed ways

In the following, many specific details of embodiments of the invention are described to provide the reader with a thorough understanding of the invention. However, those skilled in the art will understand how to implement the present invention without one or more specific details, or using other methods or components or materials. In some instances, well-known structures, materials or operations are not shown or described in detail to avoid obscuring the core concepts of the invention.

Reference in the specification to "an embodiment" means that a particular feature, structure or characteristic described in the embodiment may be included in at least one embodiment of the present invention. Therefore, “in one embodiment” appearing in various places in this specification does not necessarily mean the same embodiment. Furthermore, the specific features, structures or characteristics described above may be combined in any suitable form in one or more embodiments.

FIG. 1 is a schematic structural diagram of an embodiment of a media playback device according to the present invention. As shown in the figure, the media playback device 100 is used to receive a data stream from a media source 10 and perform media playback. Among them, the media source can be a Digital Video Broadcasting (DVB) service provider, an Internet Protocol Television (Internet Protocol Television, IPTV) service provider or an OTT service (Over-the-top media services) provider, the Internet, etc. . Furthermore, the media playback device 100 can transmit data to the display device 200 and/or the audio system in a wired or wireless manner through a specific image/sound transmission interface, such as High Definition Multimedia Interface (HDMI) or DisplayPort (DP). The devices 300 output video/audio signals, thereby reproducing audiovisual content through the devices. The media playback device 100 includes: a receiving and caching circuit 110, an analysis and decoding circuit 120 (also including a video analysis and decoding unit 122 and an audio analysis and decoding unit 124), an index table construction circuit 130, a storage unit 140, and a playback control circuit 150 and recording circuit 160.

When the user wants to watch certain audio-visual content (for example, music, movies, radio programs, etc.), the media playback device 100 will obtain the audio-visual content from the media source 10, for example, lock the frequency point to which the audio-visual content belongs (when the media source 10 is a DVB service), or makes a request to the server (when the media source 10 is an IPTV service, an OTT service or the Internet, etc.). The audiovisual content will be transmitted to the media playback device 100 in the form of a data stream. The function of the receiving and buffering circuit 110 is to receive the data stream from the media source 10 and buffer the data stream. The data stream may be in a wireless or wired form and is transmitted from the media source 10 to the media playback device 100 through one or more relay devices. In one embodiment, the data stream may include video coding based on the Moving Picture Experts Group (MPEG) standard, the Advanced Video Coding (AVC) standard, and the High Efficiency Video Coding (HEVC) standard. Or video content compressed by video coding standards such as AOMedia Video 1 (AV1). In addition, the data stream may also contain audio layers based on Advanced Codec 3 (AC-3), Moving Picture Experts Group-1 or Moving Picture Experts Group-2 Audio Layer III (MPEG-1Audio Layer III or MPEG-2Audio Layer III). , MP3), Advanced Audio Coding (AAC), MPEG and other audio coding standards, compressed audio content. It should be noted here that the audio-visual content in the data stream and the video/audio coding standard specifically adopted are not limitations of the present invention. Under different design requirements, you can choose video/audio encoding standards different from the above.

FIG. 2 is an architectural diagram of the receiving and buffering circuit 110 in the media playback device according to an embodiment of the present invention. The receiving and buffering circuit 110 includes a network receiving device 111, a frequency modulation device 112, a descrambling device 113, a demultiplexer 114 and a buffering unit 115. Wherein, when the media source 10 is an IPTV service, an OTT service or the Internet, the network receiving device 111 is used to receive the data stream; and when the media source 10 is a DVB service, the frequency modulation device 112 is used to receive the data stream. In addition, when the data unit in the data stream is scrambled, the descrambling device 113 can descramble it to obtain an unscrambled data unit. The demultiplexer 114 is used to demultiplex the data units in the data stream. The data units processed by the descrambling device 113 and the demultiplexer 114 will be cached in the cache unit 115 . For more detailed principles and architectural changes of the receiving and buffering circuit 110, please refer to the description in Taiwan Patent Application (Application No.: 110100272).

After the data units of the data stream are stored in the cache unit 115, the parsing and decoding circuit 120 will perform parsing processing on the cached data units in advance. Among them, the video analysis and decoding unit 122 and the audio analysis and decoding unit 124 determine the video/audio content contained in the data unit and various auxiliary information related to the video/audio content according to the header of the data unit. In addition, if the media playback device 100 also records the data stream in the storage unit 140 through the recording circuit 160 while receiving the data stream, the video analysis and decoding unit 122 and the audio analysis and decoding unit 124 can also record the data stream in the storage unit 140 The data units in are parsed.

After parsing and processing, relevant information about each audio-visual content in the data stream can be obtained. For example: the program identification code (Program ID) of the audio-visual content, you can also get the frame-related information of each audio-visual content, such as: frame type, data offset, encoder format, frame rate, etc. The index table construction circuit 130 will construct these information into frame index tables as shown in FIGS. 3A and 3B.

As shown in Figures 3A and 3B, the frame index table contains multiple fields that record information such as frame type, data offset, frame time, encoder format, and frame rate. Among them, the field used to record the frame type not only records the frame type, but also further indicates the program identification code of the audio-visual content to which the frame belongs (i.e., video program identification code (Video program ID, VPID) and audio program identification code (Audio program ID) ,APID)). In one embodiment, when the value of the byte used to represent the frame type is 1, it means that the frame is an intra picture (Intra picture), such as an I frame in the H.264 encoding format or the HEVC encoding format. ); when the value of this byte is 2, it means that this frame is a predicted picture (Predicted pictures), such as P frames in the H.264 encoding format or HEVC encoding format; and when the value of this byte is When 3, it means that the frame is a bi-predictive picture (Bi-predictive picture or Bi-directional picture), such as a B frame (B frame) in the H.264 encoding format or the HEVC encoding format. Please note that in different embodiments of the present invention, the frame type may be represented by values different from those listed in the above embodiments.

In the frame index table, the field that records the data offset information is mainly used to indicate the data unit to which each frame belongs, relative to the data offset (offset) of the data unit to which the starting frame (ie, frame 1) belongs. ). For example, the data offset information of frame 3 is 500, which means that the data unit to which frame 3 belongs is located 500 data offset units (for example, bytes) after the data unit to which frame 1 belongs; the data offset information of frame 5 is 1200, which means that the data unit to which frame 5 belongs is located 1200 bytes after the data unit to which frame 1 belongs. Please note that in different embodiments of the present invention, the data offset may be recorded in data units of different sizes. Although the above description is based on bytes as an example, those skilled in the art should understand the essence of this description. May have sufficient knowledge to record data offset information in other data units. In addition, depending on the size of the data unit, a data unit may contain one or more frames.

A field used to record frame time information, mainly used to indicate the time interval of each frame relative to the starting frame (i.e., frame 1). For example, the time information of frame 4 is 90, which means that the time interval between frame 4 and frame 1 is 90 time units (for example, 1/30 seconds); the time information of frame 8 is 210, which means that the time interval between frame 8 and frame 1 is 90. The time interval between is 210 time units. Please note that in different embodiments of the present invention, time information may be recorded in different time units. Although the above description uses (1/30) second as an example, those skilled in the art should have sufficient knowledge to record the time information of the frame in other time units after understanding the essence of this specification. Such changes should fall within the scope of the present invention.

The field used to record the encoder format information can be used to indicate the video encoder format used for each frame and the audio encoder format of the corresponding audio content. For example, the first byte recorded in this field can be used to represent the video encoder format, and the second byte can be used to represent the audio encoder format. However, in other embodiments of the present invention, the first byte may also be used to represent the audio encoder format, and the second byte may be used to represent the video encoder format. In one embodiment, when the value of the byte used to represent the video encoder format is 1, it means that the video encoder is in MPG format; when the value of this byte is 2, it means that the video encoder is in AVC format. ; When the value of this byte is 3, it means that the video encoder is HEVC or H.265 format; and when the value of this byte is 4, it means that the video encoder is AV1 format. Please note that in different embodiments of the present invention, the video encoder format may be represented by numerical values different from those listed in the above embodiments.

In one embodiment, when the value of the byte used to represent the audio encoder format is 1, it means that the audio encoder is in AC-3 format; when the value of this byte is 2, it means that the audio encoder is in AC-3 format. MP3 format; when the value of this byte is 3, it means that the audio encoder is in AAC format; when the value of this byte is 4, it means that the audio encoder is in MPEG format. Please note that in different embodiments of the present invention, the audio encoder format may be represented by numerical values different from those listed in the above embodiments.

The field that records frame rate information is mainly used to indicate the frame rate of the audio-visual content to which each frame belongs. For example, the frame rate of frame 1 is 30, which means that frame 1 is one frame in an audio-visual content with a frame rate of 30; the frame rate of frame 10 is 24, which means that frame 10 is one of the audio-visual content with a frame rate of 24. frame. It is worth mentioning that frame 1 may belong to the regular content of a channel/program, while frame 10 may belong to the advertising content of the same channel/program, so they have different frame rates, different video/audio encoder formats, and Different video program identification codes and audio program identification codes.

In addition, although in the embodiments shown in FIG. 3A and FIG. 3B , the frame index table records the index information of consecutive frames in the audio-visual content, in some embodiments of the present invention, the frame index table may only record intra-frame pictures. /I frame index information, but does not record the index information of the predicted image/P frame, or the bidirectional predicted image/B frame. In addition, in the embodiments shown in FIG. 3A and FIG. 3B , the index information for the predicted image/P frame and the bidirectional predicted image/B frame only includes the frame time and data offset, because the other information of these frames (For example, video program identification code, audio program identification code, video/audio encoder format, frame rate) are consistent with the previous intraframe picture/I frame.

Since the frame index table contains the index information of the intra-frame picture, the media playback device 100 can more quickly locate the data unit containing the intra-frame picture in the cache unit 115 or the storage unit 140 according to the frame index table, thereby speeding up processing of the intra-frame picture. Response to user playback control operations. Furthermore, in an embodiment, the index table construction circuit 130 may name the frame index table using the same main file name as the audio-visual content recorded in the storage unit 140, and store the frame index table in an IDX file format.

Thereafter, when the user again selects and plays back a specific audio-visual content that has been cached in the cache unit 115 or recorded in the storage unit 140, the playback control circuit 150 in the media playback device 100 will load the frame corresponding to the specific audio-visual content. direction chart. During the playback process, if the user inputs an instruction and requires the media playback device 100 to perform playback operations such as search, jump, fast forward or rewind, the playback control circuit 150 will search, jump, fast forward or rewind according to the user's request. Exit and determine a target playback time. Next, the playback control circuit 150 uses the target playback time to search the frame index table (binary search may be used), thereby determining a nearest adjacent intra-frame picture. Compared with the frame times of other intra-frame pictures, the frame time of the nearest intra-frame picture is closest to the target playback time. Then, according to the frame index table, the playback control circuit 150 can obtain the data offset corresponding to the picture in the nearest adjacent frame. After obtaining the data offset of the picture in the nearest neighboring frame, the data containing the picture in the nearest neighboring frame can be found from the cache unit 115 or the storage unit 140 according to the data offset corresponding to the picture in the nearest neighboring frame. The data unit of the image. The playback control circuit 150 may obtain one or more data units starting from the data unit. The obtained one or more data units will be decoded by the parsing and decoding circuit 120, and the nearest adjacent intra-frame picture or the image after the nearest adjacent intra-frame picture (for example, the image after the nearest adjacent intra-frame picture) will be restored. Predicted image or bidirectional predicted image).

The following will take the frame index table of FIG. 3A and FIG. 3B as an example to explain in more detail how the present invention uses the frame index table. For example, when the search, jump, fast forward or rewind playback operation input by the user is converted into the target playback time 180 by the playback control circuit 150, at this time, the playback control circuit 150 can obtain the frame 5 by searching the frame index table. (i.e., intra picture/I frame) frame time 120 is closest to the target playback time 180, so frame 5 will be considered the nearest intra picture. Moreover, it can also be seen from the frame index table that the data offset corresponding to frame 5 is 1200. Accordingly, the media playback device 100 can obtain one or more data units containing the frame 5 from the cache unit 115 or the storage unit 140, and pass them to the parsing and decoding circuit 120 to restore the audio-visual content. As shown in Figure 4, the playback control circuit 150 will start from the data offset Offset 0 of frame 1, locate one or more data units located at the data offset Offset 1200, and transfer the one or more data units to to the analysis and decoding circuit 120 for decoding.

Please note that in the above example, the nearest intraframe image is frame 5, but this image is not the actual frame corresponding to the target playback time of 180. In fact, the frame time corresponding to frame 7 is consistent with the target playback time 180, that is to say, frame 7 is the target frame. Therefore, different implementations of the present invention will have different handling modes for this situation. In a precise display mode, the playback control circuit 150 does not output the nearest adjacent intra-frame picture (frame 5) to the display device 200, but continues to obtain more data units from the cache unit 115 or the storage unit 140, and Until the parsing and decoding circuit 120 decodes the frame whose frame time is closer to the frame corresponding to the target playback time (ie, frame 7), subsequent frames will be output to the display device 200 starting from this frame, and the relevant audio will be output to the audio device 300 . It is worth mentioning that in some embodiments of the present invention, the frame index table does not record the frame time and data offset related to the predicted image/P frame, or the bidirectional predicted image/B frame. Therefore, in such embodiments, the playback control circuit 150 may obtain the unrecorded information via difference calculation. Take the frame index table and target playback time 180 of FIG. 3A and FIG. 3B as an example. The adjacent intraframe picture earlier than the target playback time of 180 is frame 5, and the frame time of frame 5 is 120, and its data offset is 1200. In addition, the adjacent intra-frame picture later than the target playback time of 180 is frame 10, and the frame time of frame 10 is 270, and its data offset is 1560. In addition, the frame rate between frame 5 and frame 10 is 30. Therefore, through difference calculation, it can be estimated that the frames corresponding to the target playback time 180 are the two frames after frame 5 (ie, frame 7), and the other The data offset is roughly 1300. In this way, the playback control circuit 150 can determine to output frame 7 (ie, the target frame) in response to the user's playback control operation in the precise mode, and output frames starting from frame 7 to the display device 200, as well as output relevant audio. 300 for audio equipment.

In a fast display mode of the present invention, the parsing and decoding circuit 120 will respond to the user's playback control operation with the nearest adjacent intra-frame picture (for example, frame 5) obtained from the frame index table, and output frames starting from frame 5 to the display device 200, and output relevant audio to the audio device 300. In another embodiment of the fast display mode of the present invention, the parsing and decoding circuit 120 obtains the nearest adjacent intra-frame picture (for example, frame 5) and the predicted image/P frame or the bidirectional predicted image/B after the nearest adjacent intra-frame picture. After the frame, the parsing and decoding circuit 120 will start outputting frames to the display device 200 from the predicted image/P frame or the bidirectional predicted image/B frame, and output relevant audio to the audio device 300 .

Figure 5 shows a flow chart of the image processing method according to the embodiment of the present invention. As shown in the figure, the image processing method of the present invention includes the following steps:

S310: Receive the data stream on the media playback device to cache the data stream in the cache unit of the media playback device or record it in the storage unit of the media playback device;

S320: Perform a parsing operation on the cached or recorded data stream to obtain the frame time and data offset corresponding to one or more intra-frame pictures of at least one audio-visual content contained in the data stream;

S330: Construct a frame index table corresponding to the audio-visual content based on the frame time and data offset corresponding to one or more intra-frame pictures;

S340: In response to the playback operation of the audio-visual content, refer to the frame index table to determine the data offset corresponding to the playback operation;

S350: Obtain one or more data units in the cache unit or storage unit according to the data offset; and

S360: Decode the one or more data units for media playback.

Since the principles and specific details of the above steps have been described in detail in previous embodiments, they will not be described again here. It should be noted that the above process may be able to better implement media playback by adding additional steps or making appropriate changes and adjustments, thereby further improving the user experience. In addition, all or part of the operations, circuit elements and modules in the aforementioned embodiments of the present invention can be implemented by the device 400 shown in Figure 6, such as the index table construction circuit 130 and playback control in the aforementioned media playback device 100. Circuit 150 etc. Among them, the storage unit 410 (eg, non-volatile memory) in the device 400 can be used to store source code, instructions, variables or data. The hardware processing unit 420 (for example, a general-purpose processor) in the device 400 can execute the source code and instructions stored in the storage unit 410, and refer to the variables or data therein to perform all the operations in the aforementioned embodiments.

Embodiments of the present invention may be implemented using hardware, software, firmware, and related combinations thereof. Embodiments of the present invention may be implemented using software or firmware stored in a memory and a corresponding instruction execution processor via an appropriate instruction execution system. In terms of hardware, it can be accomplished by applying any of the following technologies or their related combinations: a separate operational logic with logic gates that can perform logical functions based on data signals, an application-specific integrated circuit with appropriate combinational logic gates specific integrated circuit (ASIC), programmable gate array (programmable gate array, PGA) or a field programmable gate array (field programmable gate array, FPGA), etc.

The processes and blocks in the flowcharts in the description illustrate the architecture, functions and operations that can be achieved by systems, methods and computer software products based on various embodiments of the present invention. In this regard, each block in the flowchart or functional block diagram may represent a module, section, or portion of source code, which includes one or more executable instructions for implementing the specified logical function. In addition, each block in the functional block diagram and/or flowchart illustration, and combinations of blocks, can basically be implemented by special-purpose hardware systems that perform the specified functions or actions, or a combination of special-purpose hardware and computer program instructions. These computer program instructions can also be stored in a computer-readable medium, which can cause a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable medium implement flow charts and/or functional block diagrams. The function/action specified by the box in .

The above are only preferred embodiments of the present invention, and all equivalent changes and modifications made in accordance with the patentable scope of the present invention shall fall within the scope of the present invention.

【Symbol Description】

10 media sources

100 media playback device

200 display devices

300 audio equipment

110 Receiving and buffering circuit

111 Network receiving device

112 FM device

113 descrambling device

114 Demultiplexer

115 cache unit

120 Analysis and decoding circuit

122 Video analysis and decoding unit

124 audio analysis and decoding unit

130 Index table construction circuit

140 storage units

150 playback control circuit

160 recording circuit

S310～S360 steps

400 devices

410 storage units

420 hardware processing unit

Claims (10)

1. A method for media playback on a media playback device, comprising: Receive a data stream on the media playback device to cache the data stream in a cache unit in the media playback device or record it in a storage unit in the media playback device; Perform a parsing operation on the cached or recorded data stream to obtain the frame time and data offset corresponding to one or more intra-frame pictures of at least one audio-visual content contained in the data stream; Construct a frame index table corresponding to the at least one audio-visual content according to the frame time and data offset respectively corresponding to the one or more intra-frame pictures; In response to a playback operation of the at least one audio-visual content, refer to the frame index table to determine a data offset corresponding to the playback operation; Obtain one or more data units in the cache unit or the storage unit according to the data offset; and The one or more data units are decoded for media playback. 2. The method of claim 1, further comprising: Determine a target playback time according to the playback operation; Search the frame index table according to the target playback time to determine a nearest adjacent intra-frame picture, wherein the difference between the frame time corresponding to the nearest adjacent intra-frame picture and the target playback time is less than the frame index The difference between the frame time corresponding to all other intra-frame pictures in the table and the target playback time; Obtain a data offset corresponding to the nearest adjacent intra-frame picture from the frame index table; and The one or more data units are obtained from the cache unit or the storage unit according to the data offset. 3. The method of claim 1, further comprising: Determine a target playback time according to the playback operation; Search the frame index table to determine a first neighboring intra-frame picture with a frame time earlier than the target playback time; Determine a target frame corresponding to the target playback time according to the frame rate of the picture in the first adjacent frame in the frame index table; and The one or more data units are decoded, and frames are output to a display device until the target frame is obtained. 4. A media playback device, including: A receiving and buffering circuit for receiving a data stream and buffering the data stream in a buffer unit; An analysis and decoding circuit, coupled to the receiving and buffering circuit, is used to perform an analysis operation on the buffered data stream or the data stream recorded in a storage unit to obtain the data The frame time and data offset corresponding to one or more intra-frame pictures of at least one audio-visual content contained in the stream; An index table construction circuit, coupled to the parsing and decoding circuit, is used to construct an index table corresponding to the at least one audio-visual content based on the frame time and data offset respectively corresponding to the one or more intra-frame pictures. frame index table; and A playback control circuit, configured to respond to a playback operation of the at least one audio-visual content, refer to the frame index table to determine a data offset corresponding to the playback operation, and obtain the data offset according to the data offset. One or more data units in the cache unit or the storage unit; The parsing and decoding circuit is also used to decode the one or more data units for media playback. 5. The media playback device according to claim 4, wherein the index table construction circuit is further used to determine the video program identification code, audio program identification code, and video encoder corresponding to the one or more intra-frame pictures. format, audio encoder format, and frame rate to construct the frame index table. 6. The media playback device according to claim 4, wherein the parsing and decoding circuit is further used to perform parsing operations to obtain one or more predicted images of the at least one audio-visual content, and/or one or more The frame time and data offset respectively corresponding to the bidirectional predicted images; and, the index table construction circuit is also used to calculate the frame time and data offset corresponding to the one or more bidirectional predicted images according to the one or more predicted images and/or the corresponding frame time and data offset of the one or more bidirectional predicted images. The corresponding frame time and data offset are used to construct the frame index table. 7. The media playback device according to claim 4, wherein the playback control circuit is used to: Determine a target playback time according to the playback operation; Search the frame index table according to the target playback time to determine a nearest adjacent intra-frame picture, wherein the difference between the frame time corresponding to the nearest adjacent intra-frame picture and the target playback time is less than the frame index The difference between the frame time corresponding to all other intra-frame pictures in the table and the target playback time; Obtain a data offset corresponding to the nearest adjacent intra-frame picture from the frame index table; and The one or more data units are obtained from the cache unit or the storage unit according to the data offset. 8. The media playback device according to claim 7, wherein the parsing and decoding circuit is used to decode the one or more data units to obtain the nearest adjacent intra-frame picture, and from the nearest adjacent intra-frame picture The picture begins outputting frames to a display device. 9. The media playback device according to claim 7, wherein the parsing and decoding circuit is used to decode the one or more data units to obtain the nearest adjacent intra-frame picture and the following of the nearest adjacent intra-frame picture. A predicted image or a bi-directional predicted image, and frames are output to a display device starting from the predicted image or the bi-directional predicted image. 10. The media playback device according to claim 4, wherein the playback control circuit is configured to determine a target playback time according to the playback operation, and search the frame index table to determine a frame time earlier than the target playback time. a first adjacent intra-frame picture of the time, and determine a target frame corresponding to the target playback time according to the frame rate of the first adjacent intra-frame picture in the frame index table; and the parsing and decoding The circuit is used to decode the one or more data units and not start outputting frames to a display device until the target frame is obtained.