CN103002324B - A kind of 3G mobile live telecast method and system - Google Patents

Abstract

The invention discloses a streaming media data segmentation method, comprising the following steps: parsing and storing PAT information and PMT information in the streaming media data in real time; detecting whether the streaming media data reaches the splitting point; if the streaming media data reaches the splitting point, Then the streaming media data is divided into files, and the latest PAT information and PMT information are written to the head of each segmented file; if the split point is not reached, the streaming media data is filtered out PAT information and PMT information. The invention also discloses a streaming media data segmentation device, and a 3G mobile phone TV live broadcast method and system based on the streaming media data segmentation method and device. The invention can effectively reduce the code rate of streaming media data.

Description

A method and system for live broadcasting of 3G mobile phone TV

technical field

The present invention relates to a live television method and system, in particular to a streaming media data segmentation method and device based on the HTTP LiveStreaming live broadcast architecture, and a 3G mobile phone live television method and system based on the method and device.

Background technique

Streaming media refers to the media format transmitted on the network by means of streaming. Streaming media does not download the entire file before playing, but only stores the beginning part of the content in the memory, and caches the data packets in the computer to make the media data output correctly. Streaming media data streams can be transmitted and played at any time. In recent years, the application of streaming media technology based on broadband wired network has made great progress, and the technology of streaming media based on mobile communication network is also becoming more and more mature.

At present, some mobile streaming media services can already be implemented on 3G networks, and 3G networks provide more effective support for the development of mobile streaming media services. Because the 3G network has a higher data transmission rate and data service support capability, 3G operators can not only provide users with high-quality voice services, but also provide high-speed streaming media services. From a global perspective, with the acceleration of 3G commercial use, some mobile operators in Japan, South Korea, and Europe and the United States have successively launched video services based on mobile streaming media technology. Mobile streaming media services have become the core business and hot spot of 3G networks business. From the perspective of actual application, mobile streaming media can provide three business forms: on-demand, live broadcast, and download and playback. Among them, on-demand applications mainly include movie clips, highlights, MTV, etc.; live broadcast includes TV programs, video surveillance, major events, live music, etc.; downloading and playing are more suitable for those multimedia programs that are not online and require high audio and video quality . With the continuous development of mobile communication network and technology, mobile streaming media service will become the mainstream of mobile value-added service development.

From the perspective of technical implementation, among many streaming media protocols, Apple's HTTP LiveStreaming protocol is an efficient live broadcast architecture. The protocol uses standard HTTP to transmit streaming media, packs H.264 encoded video and ACC/MP3 encoded audio into MPEG-2TS, uses .m3u list to classify documents, and finally uses Apache, lighttpd and other web servers to publish.

The process of live broadcasting can be summarized as follows: first, encode the TV signal into streaming media data; then divide the streaming media data into small fixed-size files, and finally release the split small files. The process of splitting files is as follows: first, analyze the PAT information and PMT information structure in the TS stream to obtain the PID of the video; then use the PID of the video to analyze the streaming media data to obtain a complete PES (Packetized Elementary Stream), which includes The PTS (Presentation TimeStamps) of the video data, and finally the streaming media data is divided into small files with a PTS interval of 10 seconds. The purpose of splitting streaming media data into small files is to achieve the effect of 3G mobile TV live broadcast by means of HTTP download.

The existing methods of segmenting streaming media data simply analyze the time information, and then segment according to the time information, without analyzing the correlation in the information in detail. The code rate of the segmented TS stream is usually relatively high, which restricts Provide users with clearer streaming services. However, after analyzing the MPEG-2TS protocol standard, it is found that there are the following characteristics: all PAT information and PMT information do not change the basic characteristics of audio and video, except for a few fields that identify serialization information. identical. Experiments have proved that the proportion of PAT information and PMT information in the live stream is about 16.2% to 19.1%, which provides the possibility to reduce the bit rate of the TS stream.

Contents of the invention

Aiming at the defects in the prior art, the technical problem to be solved by the present invention is to provide a stream media data segmentation method and device capable of reducing the code rate, a 3G mobile phone TV live broadcast method and system.

In order to solve the problems of the technologies described above, the technical scheme adopted in the present invention is as follows:

A method for segmenting streaming media data, comprising the following steps:

(1) analyze and store PAT information and PMT information in the streaming media data in real time;

(2) Detect whether the streaming media data reaches the segmentation point;

If the split point is reached, the streaming media data is split into files, and the latest PAT information and PMT information are written to the head of the split file; if the split point is not reached, the stream is filtered out PAT information and PMT information in the media data.

A device for segmenting streaming media data, including a parsing unit for parsing PAT information and PMT information in the streaming media data;

a storage unit for storing the PAT information and PMT information;

A detection unit for detecting whether the streaming media data reaches the segmentation point;

For when the segmentation point is reached, the streaming media data is segmented into files, and the latest PAT information and PMT information are written into the segmentation unit of the file header after segmentation;

A filtering unit for filtering out PAT information and PMT information in the streaming media data.

A method for live broadcasting of 3G mobile phone television, comprising the following steps:

(1) The TV signal is encoded into streaming media data encapsulated in TS format;

(2) analyze and store PAT information and PMT information in the streaming media data in real time;

(3) Detect whether the streaming media data reaches the segmentation point;

If the split point is reached, the streaming media data is split into files, and the latest PAT information and PMT information are written to the head of the split file; if the split point is not reached, the stream is filtered out PAT information and PMT information in the media data;

(4) Publishing the divided files to 3G mobile phone users.

A 3G mobile phone live TV system, including a coding device for coding a TV signal into stream media data encapsulated in TS format;

A first pushing device for pushing streaming media data to the splitting device;

The above-mentioned cutting device;

A second push device for pushing the divided file to the publishing device;

The distribution device is used for distributing the divided files to the 3G mobile phone users.

The method, device and system of the present invention effectively reduce the code rate of streaming media data by writing the latest PAT and PMT information into the head of each file after segmentation and filtering the PAT information and PMT information . Experiments prove that after being processed by the present invention, the code rate of streaming media data can be reduced by 15%-17.6%.

Description of drawings

Fig. 1 is the structural block diagram of 3G mobile phone TV broadcasting system in the specific embodiment;

Fig. 2 is the structural block diagram of cutting device in the specific embodiment;

Fig. 3 is a flow chart of the 3G mobile phone live broadcast method in the specific embodiment.

Detailed ways

Aiming at the characteristics of the 3G wireless network, the present invention utilizes the relatively mature HTTP LiveStreaming technology at the same time to propose a 3G mobile phone TV live broadcasting method and system with good audio and video quality at a low bit rate. The present invention will be described in detail below in conjunction with specific embodiments and accompanying drawings.

Fig. 1 shows the structure of the 3G mobile phone TV live broadcast system in this embodiment. As shown in FIG. 1 , the system includes an encoding device 11 , a first pushing device 12 , a splitting device 13 , a second pushing device 14 and a publishing device 15 .

The encoding device 11 is used to encode the television signal into stream media data encapsulated in TS (transport stream) format.

The first pushing device 12 is used for pushing the stream media data to the splitting device 13 .

The segmenting device 13 is used for segmenting the streaming media data into several small files. As shown in Figure 2, the segmentation device 13 comprises the parsing unit 131 for analyzing the PAT (Program Association Table) information and the PMT (Program Map Table) information in the streaming media data; The storage unit for storing the PAT information and the PMT information 132; The detection unit 133 for detecting whether the streaming media data reaches the segmentation point; For when the segmentation point is reached, the streaming media data is segmented into files, and the latest PAT information and PMT information are written into the segmented back A file header segmentation unit 134; a filtering unit 135 for filtering out PAT information and PMT information in the streaming media data.

The second pushing device 14 is used for pushing the divided file to the publishing device 15 .

The distributing device 15 is used for distributing the divided files to 3G mobile phone users.

FIG. 3 shows the flow of the method for realizing the live broadcast of 3G mobile phone TV by adopting the system shown in FIG. 1 . As shown in Figure 3, the method includes the following steps:

(1) The encoding device 11 encodes the television signal into stream media data encapsulated in TS format.

Due to the possibility of serious packet loss on the 3G wireless network, in order to transmit and store one or more program coded data, this embodiment uses the TS encapsulation format. After encoding the TV signal into streaming media data, the first pushing device 12 pushes the streaming media data to the splitting device 13 through the UDP protocol in the gigabit intranet.

(2) the parsing unit 131 in the segmentation device 13 analyzes the PAT information and the PMT information in the stream media data in real time, and the storage unit 132 stores the PAT information and the PMT information parsed into the internal memory, and replaces the PAT information and the PMT information of the original storage .

(3) The detection unit 133 detects whether the streaming media data reaches the segmentation point. If the segmentation point is reached, the streaming media data is segmented into files by the segmentation unit 134, and the latest PAT information and PMT information are written to the head of the file after segmentation; if the segmentation point is not reached, the filtering unit 135 Filter out the PAT information and PMT information in the streaming media data.

The segmentation point can be determined by the existing method: first parse out the PAT information and PMT information structure in the TS stream to obtain the PID of the video; then use the PID of the video to parse in the streaming media data to obtain a complete PES (Packetized Elementary Stream), It includes PTS (Presentation Time Stamps) containing video data; finally, the streaming media data is divided into small files with a PTS interval of 10 seconds, and the interval can be set. After splitting into files, the second pushing device 14 pushes them to the issuing device 15 .

(4) The distributing device 15 distributes the divided files to the 3G mobile phone users.

Firstly, the received file record is added to a playlist file, and the media files are placed in the same path at the same time, and then the playlist file is released.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (10)

1. a stream medium data cutting method, is characterized in that, comprises the following steps:

(1) real time parsing PAT information in stored stream media data and PMT information;

(2) detect described stream medium data and whether arrive cut-off;

If arrival cut-off, then described stream medium data is cut into file, and the head of file after up-to-date PAT information and PMT information being written to cutting; If do not arrive cut-off, then filter out the PAT information in described stream medium data and PMT information.

2. stream medium data cutting method as claimed in claim 1, is characterized in that: in step (1), the PAT information parsed and PMT information is stored in internal memory.

3. stream medium data cutting method as claimed in claim 1, is characterized in that: cut-off described in step (2) is the PTS interval point of 10 seconds.

4. a 3G mobile live telecast method, is characterized in that, comprises the following steps:

(1) stream medium data being become by television signal coding TS form to encapsulate;

(2) real time parsing PAT information in stored stream media data and PMT information;

(3) detect described stream medium data and whether arrive cut-off;

If arrival cut-off, then described stream medium data is cut into file, and the head of file after up-to-date PAT information and PMT information being written to cutting; If do not arrive cut-off, then filter out the PAT information in described stream medium data and PMT information;

(4) file after cutting is issued to 3G mobile user.

5. 3G mobile live telecast method as claimed in claim 4, is characterized in that: in step (2), the PAT information parsed and PMT information is stored in internal memory.

6. 3G mobile live telecast method as claimed in claim 4, is characterized in that: cut-off described in step (3) is the PTS interval point of 10 seconds.

7. 3G mobile live telecast method as claimed in claim 4, is characterized in that: in step (3), is added to by the file record after cutting in a play list file.

8. 3G mobile live telecast method as claimed in claim 7, is characterized in that: issue described play list file, under the file after cutting being positioned over same path simultaneously.

9. a stream medium data cutting device (13), is characterized in that: comprise the resolution unit (131) for the PAT information in resolution flow media data and PMT information;

For storing the memory cell (132) of described PAT information and PMT information;

The detecting unit (133) of cut-off whether is arrived for detecting described stream medium data;

For when arriving cut-off, then described stream medium data is cut into file, and the cutting unit (134) of top of file after up-to-date PAT information and PMT information being written to cutting;

For filtering out the filter element (135) of PAT information in described stream medium data and PMT information.

10. a 3G mobile television direct broadcast system, is characterized in that: the code device (11) comprising the stream medium data for being become by television signal coding TS form to encapsulate;

For stream medium data being pushed to first pusher (12) of cutting device (13);

Cutting device according to claim 9 (13);

For by the file push after cutting to second pusher (14) of distributing device (15);

For the distributing device (15) of file after issuing cutting to 3G mobile user.