CN105744380B - A kind of media data flow playback method and system based on android system - Google Patents

Abstract

The invention discloses a method and system for playing media data streams based on an Android system. Wherein, the method includes the steps: A. Applying the APP to establish a multicast address, and opening the multicast port to generate a multicast channel; B. Using the APP to obtain the transmission stream packet of the data source, and using the multicast channel to send the transmission stream package, forming a multicast stream in the Android system; C, the application APP uses the multicast address to open the player of the application layer, and starts to play the multicast stream. The present invention does not need to modify the Android system layer, is easy to implement, and is simple to apply; the present invention makes full use of the data multicast function of the TCP/IP protocol stack in the Android system, forms a data stream proxy through a standard multicast channel, and achieves non-standard data streams The purpose of playing through a standard Android application layer player; the present invention can be applied in released Android systems or products, can solve specific media stream playback problems, and has good compatibility and versatility.

Description

A method and system for playing media data stream based on Android system

technical field

The invention relates to the field of multimedia data playback, in particular to a method and system for playing media data streams based on an Android system.

Background technique

At present, for products equipped with the Android system, such as mobile phones, set-top boxes, and smart TVs, etc., the playback is achieved by specifying a specific playback data resource locator URL in the application APP, and then passing it to the playback service layer at the bottom of the system, through the playback service layer. Specific data request, processing, playback and display, etc., thus forming a complete multimedia subsystem in the Android system. However, such a multimedia subsystem also has disadvantages: the ability to deal with non-universal or non-standard playback resource data is poor.

In the prior art, there are generally two ways to improve: the first is to modify the playback service layer at the bottom of the system, so as to achieve support for specific playback resources to achieve playback; the second is to obtain specific data layer by layer after the application layer Penetrate to the underlying playback service layer, and then realize decoding and playback through a specific decoding channel.

However, both of the above two methods require the intervention of product software system development. The software development workload is large and inefficient, and it may also cause audio and video delays; and solidification, so it is impossible to play non-universal or non-standard resources.

Therefore, the prior art still needs to be improved and developed.

Contents of the invention

In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a media data stream playback method and system based on the Android system, aiming at solving the problem that the existing playback method cannot support specific media resources, development is difficult, low efficiency and possible Problems that affect the playback effect.

Technical scheme of the present invention is as follows:

A kind of media data streaming playing method based on Android system, wherein, comprises steps:

A. Apply the APP to establish a multicast address, and open the multicast port to generate a multicast channel;

B. Apply the APP to obtain the transport stream packet of the data source, and utilize the multicast channel to send the transport stream packet to form a multicast stream in the Android system;

C. The application APP uses the multicast address to open the player of the application layer, and starts to play the multicast stream.

Preferably, after the step C, it also includes:

D. When controlling the player through the application APP, matching and controlling the data injection rate and flow of the multicast channel.

Preferably, after the step D, it also includes:

E. When the data source finishes playing, close the multicast channel and close the player.

Preferably, said step A specifically includes:

A1. Use the APP to query the network and network port usage status in the Android system, and use the idle network port as a multicast port;

A2. The APP uses the multicast port to establish a multicast address, and opens the multicast port to generate a multicast channel.

Preferably, the manipulation includes pausing, resuming and playing at double speed.

A kind of media data streaming playing system based on Android system, wherein, comprises:

The multicast channel generation module is used to establish a multicast address, and open a multicast port to generate a multicast channel;

The multicast flow forming module is used to obtain the transport stream packet of the data source, and utilizes the multicast channel to send the transport stream packet to form a multicast stream in the Android system;

The playing module is used to use the multicast address to open the player of the application layer, and start playing the multicast stream.

Preferably, the media data stream playing system also includes:

A control module, configured to match and control the data injection rate and flow of the multicast channel when the player is controlled by the application APP.

Preferably, the media data stream playing system also includes:

The closing module is used to close the multicast channel and the player when the data source finishes playing.

Preferably, the multicast channel generation module specifically includes:

The query unit is used to query the network in the Android system and the usage status of the network port, and use the network port in idle state as the multicast port;

The multicast channel generation unit is configured to use the multicast port to establish a multicast address, open the multicast port, and generate a multicast channel.

Preferably, the manipulation includes pausing, resuming and playing at double speed.

Beneficial effects: the present invention can be completely implemented inside the application APP, and the actual playback is performed through the standard player component of the Android application layer. The whole process does not need to modify the Android system layer, so it is easy to implement and simple to apply; the present invention fully utilizes the The data multicast function of the TCP/IP protocol stack forms a data stream agent by a standard multicast channel, and reaches the purpose of playing non-standard data streams through a standard Android application layer player; the present invention can be used in released Android systems or The application in the product can solve specific media streaming problems, and has good compatibility and versatility.

Description of drawings

Fig. 1 is a kind of flow chart of the first embodiment of the media data stream playing method based on the Android system of the present invention;

Fig. 2 is the specific flowchart of step S1 in Fig. 1;

Fig. 3 is a kind of flow chart of the second embodiment of the method for playing media data stream based on the Android system of the present invention;

Fig. 4 is a flow chart of the third embodiment of a media data stream playing method based on the Android system of the present invention;

Fig. 5 is a structural block diagram of the first embodiment of a media data stream playing system based on the Android system of the present invention;

Fig. 6 is the specific flowchart of multicast channel generation module in Fig. 5;

Fig. 7 is a structural block diagram of the second embodiment of a media data stream playing system based on the Android system of the present invention;

FIG. 8 is a structural block diagram of a third embodiment of a media data stream playing system based on an Android system according to the present invention.

Detailed ways

The present invention provides a method and system for playing media data streams based on the Android system. In order to make the purpose, technical solution and effect of the present invention clearer and clearer, the present invention will be further described in detail below. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Please refer to Fig. 1, Fig. 1 is a kind of flow chart of the first embodiment of the media data streaming playing method based on Android system of the present invention, and it comprises steps:

S1. Apply the APP to establish a multicast address, and open a multicast port to generate a multicast channel;

S2. Applying the APP to obtain the transport stream packet of the data source, and sending the transport stream packet through the multicast channel to form a multicast stream in the Android system;

S3. The application APP uses the multicast address to open the player of the application layer, and starts to play the multicast stream.

On the premise of not modifying the product system, the present invention can solve the playback of specific media data streams by applying the technology in the APP, thereby enhancing the applicability and versatility of the product. The method of the present invention is very suitable for application in scenarios where the APP can obtain stable and smooth media streams.

The realization principle of the present invention is mainly: use the multicast function in the local area network provided by the TCP/IP protocol stack in the Android system, establish a multicast channel in the Android system in the application APP, and send (inject) the transmission to this multicast channel Streaming packets, while using the media playback subsystem of the Android system to support the playback of standard multicast resources to achieve the playback requirements.

As shown in Figure 2, the step S1 specifically includes:

S11, using the APP to query the network in the Android system and the usage status of the network port, and use the network port in the idle state as the multicast port;

S12. The APP uses the multicast port to establish a multicast address, and opens the multicast port to generate a multicast channel.

This step is to make full use of the data multicast function of the TCP/IP protocol stack in the Android system, and use the private data stream (or private media stream) inside the app to form a multicast stream in the system, that is, to form an open and standard playback stream. This step cleverly utilizes the function of the global TCP/IP protocol stack in the Android system to make it complete the transfer station or proxy server function of the private media stream, thereby converting the private media stream into an open and standard playback stream.

Specifically, the key in this step is to determine the multicast address and multicast port required by the application APP. Because in the IP network, the multicast address has its special regulations: the multicast address (multicast address) is the multicast address, which is an identifier of a group of hosts, which have been added to a multicast group. In Ethernet, a multicast address is a 48-bit identifier that names a group of stations on the network that should receive a packet. In IPv4, a multicast address is also called a class D address, which is a type of IP address ranging from 224.0. 224.0.0.0-239.255.255.255 multicast reserved addresses), or, equivalently, within 224.0.0.0/4. But 224.0.0.0 is reserved and cannot be assigned to any multicast group.

For example, the selected multicast address starts from 239.1.2.1, and the sending port starts to check from 1234. If the target port is found to be occupied, add 1 successively until a free port that meets the requirements is found as the multicast port, that is, the established multicast port should be A dynamic or private port that is free in the current system. Through inspection, it is found that the target port 1234 is free, and the determined multicast address URL is udp://239.1.2.1:1234, that is, the URL starting with UDP, such as "udp://multicast address:port number". Opening a multicast channel means establishing a multicast SOCKET, binding a multicast port, and joining a multicast group.

In step S2, the application APP continuously acquires the data stream to be played to form continuous transport stream packets (TS packets), and continuously sends (that is, injects) transport stream packets through the aforementioned multicast channel to form a multicast stream in the system. The key process in this step is to obtain the correct transport stream packet and send the transport stream packet to the multicast channel.

Since the present invention is designed to solve the problem of playing specific data streams, the analysis of specific data streams is not the focus of the present invention (different data sources should have their own data analysis instructions or interfaces), and the focus of the present invention is these data The process after stream parsing is obtained. In particular, it is necessary to confirm that the data packet is a transport stream packet before sending it to the multicast channel. Playback based on the Android system generally supports direct decoding and playback of TS streams. If the analyzed data packet is not a TS packet such as a program stream packet, it needs to be converted into a TS packet before sending. As for sending the TS packet to the multicast channel, it is to send the TS packet to the multicast SOCKET opened in step S1.

In addition, the process of obtaining data packets (that is, transport stream packets) and sending data packets to the multicast channel should start before the player is opened. When the player is opened, there must be a certain amount of media data in the multicast channel.

In the step S3, since the multicast address URL is relatively standard and universal, use the standard multicast address to open the Android application layer player (standard player MediaPlayer) to play the multicast stream. In the present invention, the essence of playing still utilizes the MediaPlayer of the Android application layer to realize playing, and only converts the data stream before the MediaPlayer touches the data.

Specifically, the key process of this step is to use the aforementioned multicast address URL to open a standard player MediaPlayer in the Android application layer. For example, the multicast address URL: "udp://239.1.2.1:1234", that is, call the setDataSource interface of MediaPlayer through this URL, and call the prepare interface (preparation interface) and start interface (start interface) in turn after success. If these processes All successful, indicating that this step is complete. This step starts after step S2, and the two are interdependent, and may require multiple data injections to open MediaPlayer (MediaPlayer needs to detect a certain amount of media data when it is opened to determine the decoding type and other key parameters for playback ); and if there is no player to consume the data of the multicast channel just by injecting data, then injecting data is also useless.

Therefore, in order to successfully complete such a data relationship, a task can be specially set to complete the opening process of MediaPlayer, that is, data injection and MediaPlayer opening are completed in different tasks, and MediaPlayer only needs to be successfully opened once. The player that opens the Android application layer refers to the player object that is opened in the process of the application APP itself, specifically including the process of creating, setting the playback source, and preparing for playback using the standard interface of MediaPlayer; after opening the player, start playing, and other It means to use the standard interface method provided by the player to start playing the data stream (TS packet).

Please refer to Fig. 3, Fig. 3 is a kind of flow chart of the second embodiment of the media data stream playing method based on the Android system of the present invention, and it comprises steps:

S1. Apply the APP to establish a multicast address, and open a multicast port to generate a multicast channel;

S2. Applying the APP to obtain the transport stream packet of the data source, and sending the transport stream packet through the multicast channel to form a multicast stream in the Android system;

S3. The application APP uses the multicast address to open the player of the application layer, and starts to play the multicast stream;

S4. When the player is controlled by the application APP, match and control the data injection rate and flow of the multicast channel.

It is different from the first embodiment of the method above in that a step S4 is added after the step S3, which is added to improve the entire playback process. The data injection should take into account the playback scene, and the playback scene also needs to consider the data injection situation. Only in this way is the playback process perfect. For example, when the APP application needs to pause the playback operation, the pause (pause) interface of the MediaPlayer is used to pause the player, and the data injection process, data parsing and acquisition process must also be paused, otherwise the data injected into the multicast channel The data will be wasted, and the playback result will be wrong when the playback is resumed; similarly, when the application needs to resume the playback display, the playback display of the player through the start interface of the MediaPlayer also requires the data injection process and data analysis. The acquisition process must resume processing synchronously, otherwise the whole process will be misplaced. That is, when the player is controlled through the application APP, the data injection rate and traffic of the multicast channel are matched and controlled.

The APP application continuously and repeatedly obtains the transport stream packet and continuously sends the transport stream packet to the multicast channel; during the playback process, it is necessary to adjust the sending speed and data volume according to the type of media to be played and the playback link, so as to avoid exceeding or not satisfying the playback requirements. The required data flow; in addition, the player object can also be operated according to the requirements of the application, such as pause, resume, double-speed playback, etc. (but obviously other common or infrequent operations can also be used), and data flow injection is also required for corresponding match.

Please refer to Fig. 4, Fig. 4 is a kind of flow chart of the third embodiment of the media data stream playing method based on Android system of the present invention, and it comprises steps:

S1. Apply the APP to establish a multicast address, and open a multicast port to generate a multicast channel;

S2. Applying the APP to obtain the transport stream packet of the data source, and sending the transport stream packet through the multicast channel to form a multicast stream in the Android system;

S3. The application APP uses the multicast address to open the player of the application layer, and starts to play the multicast stream;

S4. When controlling the player through the application APP, matching and controlling the data injection rate and flow of the multicast channel;

S5. When the playing of the data source ends, close the multicast channel and close the player.

It is different from the second embodiment of the method in that after the step S4, a step S5 is added. In the step S5, the application can control the player according to the data stream status or the user's request, and choose to exit the playback, and the exit data injection ends together.

Specifically, the process of ending playback: one is when the data stream that needs to be played in the application has been completed; the other is when an unsolvable problem is encountered during playback, or the user needs to end the playback. In both cases, the playback process needs to be exited. When exiting, you need to close the opened resources: multicast channel, player, etc. These are important resources in the system, and they should be closed when not needed.

In the present invention, technical processes such as data acquisition, establishment of the multicast channel, sending data to the multicast channel, opening and manipulating the player MediaPlayer are all implemented in the same application process.

Based on the above method, the present invention also provides a first embodiment of a media data stream playback system based on the Android system, as shown in Figure 5, which includes:

The multicast channel generating module 100 is used to set up a multicast address, and open a multicast port to generate a multicast channel;

The multicast flow forming module 200 is used to obtain the transport stream packet of the data source, and utilizes the multicast channel to send the transport stream packet to form a multicast stream in the Android system;

The playing module 300 is configured to use the multicast address to open the player of the application layer, and start playing the multicast stream.

The first embodiment of the system of the present invention solves the playback of specific media data streams by applying the technology in the APP, which enhances the applicability and versatility of the product. The system of the present invention is very suitable for application in the scenario where the APP can obtain stable and smooth media streams. Its realization principle is mainly: use the multicast function in the local area network provided by the TCP/IP protocol stack in the Android system, establish a multicast channel in the Android system in the application APP, and send (inject) the transport stream packet into the multicast channel At the same time, the Android system media playback subsystem supports the playback of standard multicast resources to meet the playback requirements.

As shown in Figure 6, the multicast channel generation module 100 specifically includes:

Inquiry unit 110 is used to inquire about the network in the Android system and the usage state of the network port, and use the idle network port as the multicast port;

The multicast channel generating unit 120 is configured to use the multicast port to establish a multicast address, open the multicast port, and generate a multicast channel.

In the multicast channel generation module 100, the key is to determine the multicast address and multicast port required by the application APP. Because in the IP network, the multicast address has its special regulations: the multicast address (multicast address) is the multicast address, which is the identifier of a group of hosts, which have been added to a multicast group. In Ethernet, a multicast address is a 48-bit identifier that names a group of stations on the network that should receive a packet. In IPv4, a multicast address is also called a class D address, which is a type of IP address ranging from 224.0. 224.0.0.0-239.255.255.255 multicast reserved addresses), or, equivalently, within 224.0.0.0/4. But 224.0.0.0 is reserved and cannot be assigned to any multicast group.

For example, the selected multicast address starts from 239.1.2.1, and the sending port starts to check from 1234. If the target port is found to be occupied, add 1 successively until a free port that meets the requirements is found as the multicast port, that is, the established multicast port should be A dynamic or private port that is free in the current system. Through inspection, it is found that the target port 1234 is free, and the determined multicast address URL is udp://239.1.2.1:1234, that is, the URL starting with UDP, such as "udp://multicast address:port number". Opening a multicast channel means establishing a multicast SOCKET, binding a multicast port, and joining a multicast group.

In the multicast stream forming module 200, the application APP continuously acquires the data stream to be played to form continuous transport stream packets (TS packets), and continuously sends (that is, injects) transport stream packets through the aforementioned multicast channel to form a system internal TS packet. of multicast streams. The key in this module is to obtain the correct transport stream packet and send the transport stream packet to the multicast channel.

Since the present invention is designed to solve the problem of playing specific data streams, the analysis of specific data streams is not the focus of the present invention (different data sources should have their own data analysis instructions or interfaces), and the focus of the present invention is these data The process after stream parsing is obtained. In particular, it is necessary to confirm that the data packet is a transport stream packet before sending it to the multicast channel. Playback based on the Android system generally supports direct decoding and playback of TS streams. If the analyzed data packet is not a TS packet such as a program stream packet, it needs to be converted into a TS packet before sending. As for sending the TS packet to the multicast channel, it is to send the TS packet to the multicast SOCKET opened in the multicast channel generating module 100 .

In the playing module 300, since the multicast address URL is relatively standard and universal, use this standard multicast address to open the player (standard player MediaPlayer) of the Android application layer to realize the playback of the multicast stream . In the present invention, the essence of playing still utilizes the MediaPlayer of the Android application layer to realize playing, and only converts the data stream before the MediaPlayer touches the data.

Specifically, the key of this module is to use the aforementioned multicast address URL to open a standard player MediaPlayer in the Android application layer. For example, the multicast address URL: "udp://239.1.2.1:1234", that is, call the setDataSource interface of MediaPlayer through this URL, and call the prepare interface (preparation interface) and start interface (start interface) in turn after success. If these processes All successful, indicating that this step is complete. The playback module 300 and the multicast stream forming module 200 are interdependent, and may require multiple data injections to open the MediaPlayer (MediaPlayer needs to detect a certain amount of media data when it is opened to determine the decoding type and Other key parameters for playback); and if only the data is injected and there is no player to consume the data of the multicast channel, then the injected data is useless.

Therefore, in order to successfully complete such a data relationship, a task can be specially set to complete the opening process of MediaPlayer, that is, data injection and MediaPlayer opening are completed in different tasks, and MediaPlayer only needs to be successfully opened once. The player that opens the Android application layer refers to the player object that is opened in the process of the application APP itself, specifically including the process of using the standard interface of MediaPlayer to create, set the playback source, and prepare for playback; after opening the player, start playing, other It means to use the standard interface method provided by the player to start playing the data stream (TS package).

The present invention also provides a second embodiment of a media data stream playing system based on an Android system, as shown in FIG. 7 , which includes:

The multicast channel generating module 100 is used to set up a multicast address, and open a multicast port to generate a multicast channel;

The multicast flow forming module 200 is used to obtain the transport stream packet of the data source, and utilizes the multicast channel to send the transport stream packet to form a multicast stream in the Android system;

The playing module 300 is used to open the player of the application layer by using the multicast address, and start playing the multicast stream;

The control module 400 is configured to match and control the data injection rate and flow of the multicast channel when the player is controlled by the application APP.

It is different from the first embodiment of the system in that a control module 400 is added to improve the entire playback process. The data injection should take into account the playback scene, and the playback scene also needs to consider the data injection situation. Only in this way is the playback process perfect. For example, when the APP application needs to pause the playback operation, the pause (pause) interface of the MediaPlayer is used to pause the player, and the data injection process, data parsing and acquisition process must also be paused, otherwise the data injected into the multicast channel The data will be wasted, and the playback result will be wrong when the playback is resumed; similarly, when the application needs to resume the playback display, the playback display of the player through the start interface of the MediaPlayer also requires the data injection process and data analysis. The acquisition process must resume processing synchronously, otherwise the whole process will be misplaced. That is, when the player is controlled through the application APP, the data injection rate and traffic of the multicast channel are matched and controlled.

The APP application continuously and repeatedly obtains the transport stream packet and continuously sends the transport stream packet to the multicast channel; during the playback process, it is necessary to adjust the sending speed and data volume according to the type of media to be played and the playback link, so as to avoid exceeding or not satisfying the playback requirements. The required data flow; in addition, the player object can also be operated according to the requirements of the application, such as pause, resume, double-speed playback, etc. (but obviously other common or infrequent operations can also be used), and data flow injection is also required for corresponding match.

The present invention also provides a third embodiment of a media data stream playing system based on an Android system, as shown in FIG. 8 , which includes:

The multicast channel generating module 100 is used to set up a multicast address, and open a multicast port to generate a multicast channel;

The multicast flow forming module 200 is used to obtain the transport stream packet of the data source, and utilizes the multicast channel to send the transport stream packet to form a multicast stream in the Android system;

The playing module 300 is used to open the player of the application layer by using the multicast address, and start playing the multicast stream;

A control module 400, configured to match and control the data injection rate and flow of the multicast channel when the player is controlled by the application APP;

The closing module 500 is configured to close the multicast channel and the player when the data source finishes playing.

It differs from the second embodiment of the system in that a shutdown module 500 is added. In this module, the application can control the player according to the data stream status or user requirements, choose to quit playing, and exit data injection together.

Specifically, the process of ending playback: one is when the data stream that needs to be played in the application has been completed; the other is when an unsolvable problem is encountered during playback, or the user needs to end the playback. In both cases, the playback process needs to be exited. When exiting, you need to close the opened resources: multicast channel, player, etc. These are important resources in the system, and they should be closed when not needed.

In the present invention, technical processes such as data acquisition, establishment of the multicast channel, sending data to the multicast channel, opening and manipulating the player MediaPlayer are all implemented in the same application process.

It should be understood that the application of the present invention is not limited to the above examples, and those skilled in the art can make improvements or transformations according to the above descriptions, and all these improvements and transformations should belong to the protection scope of the appended claims of the present invention.

Claims (4)

1. a media data stream playing method based on Android system, is characterized in that, comprises steps: A. Apply the APP to establish a multicast address, and open the multicast port to generate a multicast channel; B. Apply the APP to obtain the transport stream packet of the data source, and utilize the multicast channel to send the transport stream packet to form a multicast stream in the Android system; C. The application APP uses the multicast address to open the player of the application layer, and starts to play the multicast stream; Described step A specifically comprises: A1. Use the APP to query the network and network port usage status in the Android system, and use the idle network port as a multicast port; A2, the application APP uses the multicast port to establish a multicast address, and opens the multicast port to generate a multicast channel; Utilize the multicast function in the local area network provided by the TCP/IP protocol stack in the Android system, establish a multicast channel in the Android system in the application APP, send or inject transport stream packets into the multicast channel, and use the Android system media at the same time The playback subsystem supports the playback of standard multicast resources to meet playback requirements; After the step C, also include: D. When the player is manipulated through the application APP, the data injection rate and flow of the multicast channel are matched and controlled; the manipulation includes pausing, resuming, and double-speed playback; In the step B, the application APP continuously obtains the data stream to be played to form a continuous transport stream packet, and continuously sends the transport stream packet through the multicast channel to form a multicast stream in the system; if the obtained data stream is not a transmission stream Stream packets, the data stream needs to be converted into transport stream packets before sending. 2. the media data stream playing method based on Android system according to claim 1, is characterized in that, also comprises after described step D: E. When the data source finishes playing, close the multicast channel and close the player. 3. A media data stream playing system based on Android system, characterized in that, comprising: The multicast channel generation module is used to establish a multicast address, and open a multicast port to generate a multicast channel; The multicast flow forming module is used to obtain the transport stream packet of the data source, and utilize the multicast channel to send the transport stream packet to form a multicast stream in the Android system; the application APP continuously acquires the data stream to be played to form a continuous The transport stream packets are sent continuously through the multicast channel to form a multicast stream in the system; if the obtained data stream is not a transport stream packet, the data stream needs to be converted into a transport stream packet before sending; A playback module, configured to use the multicast address to open the player of the application layer, and start playing the multicast stream; The multicast channel generation module specifically includes: The query unit is used to query the network in the Android system and the usage state of the network port, and use the network port in idle state as the multicast port; A multicast channel generating unit, configured to use the multicast port to establish a multicast address, and open the multicast port to generate a multicast channel; Using the multicast function in the local area network provided by the TCP/IP protocol stack in the Android system, establish a multicast channel in the Android system in the application APP, send or inject transport stream packets into the multicast channel, and use the Android system media at the same time The playback subsystem supports the playback of standard multicast resources to meet playback requirements; Also includes: The control module is used to match and control the data injection rate and flow of the multicast channel when the player is controlled by the application APP; the control includes pausing, resuming and playing at double speed. 4. the media data stream playing system based on Android system according to claim 3, is characterized in that, also comprises: The closing module is used to close the multicast channel and the player when the data source finishes playing.