WO2017152566A1 - 一种协商媒体编解码的方法，及一种终端设备 - Google Patents

一种协商媒体编解码的方法，及一种终端设备 Download PDF

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Publication number
WO2017152566A1
WO2017152566A1 PCT/CN2016/090708 CN2016090708W WO2017152566A1 WO 2017152566 A1 WO2017152566 A1 WO 2017152566A1 CN 2016090708 W CN2016090708 W CN 2016090708W WO 2017152566 A1 WO2017152566 A1 WO 2017152566A1
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Prior art keywords
terminal device
signaling
media codec
capability set
response signaling
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PCT/CN2016/090708
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English (en)
French (fr)
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张建龙
陈昊
张明
牟婷娥
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中兴通讯股份有限公司
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Publication of WO2017152566A1 publication Critical patent/WO2017152566A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40—Network security protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/24—Negotiation of communication capabilities

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  • the present application relates to, but is not limited to, the field of communication technologies, and in particular, to a method for negotiating media codecs, and a terminal device to which the method is applied.
  • IMS IP Multimedia Subsystem
  • device A sends its media codec capability to device B with which it communicates, and then device B determines the media codec used by both based on the media codec capability set of device A, and sends the media codec.
  • device B determines the media codec used by both based on the media codec capability set of device A, and sends the media codec.
  • the problem with this method is that when another device C connected to device A is to mix the audio signals of the three devices together with device B, device A cannot completely acquire the media codec of device B and device C.
  • the capability set will cause both device B and device C to have a common media codec set, but the media codec that is fed back to device A is different, so that when the audio signals of the three devices are mixed, the three will use 2 A kind of media codec is used to mix with other devices. This way, the capability of the device chip is high, and even the quality of the mix is affected. If a media codec is used for mixing, it may be due to a device. This media codec is not supported and causes media negotiation to fail.
  • Mode 2 When device A and device B perform media codec negotiation, device A sends a dedicated query signaling to device B to query the media codec capability of device B.
  • the problem in this way is that because the query signaling will be sent to the network (for example, a network conforming to TCP/IP), a large amount of query signaling will increase the burden on various devices in the network, and at the same time, various kinds in the network.
  • the device does not forward all the query signaling. When the various devices in the network do not forward the query signaling successfully, the media codec capability between device A and device B may not be accurately negotiated.
  • the present application provides a method and a terminal device for negotiating media codec, which is used to solve the problem that the media codec negotiation mode of the related art causes a low negotiation success rate, and when there is a multi-party mixing, there is a problem that affects the quality of the mixing.
  • an embodiment of the present invention provides a method for negotiating a media codec, which is applied to a first terminal device, including:
  • the first terminal device sends request signaling to the at least one second terminal device, where the request signaling includes request information for acquiring a media codec capability set supported by the second terminal device;
  • the first terminal device receives the response signaling sent by the at least one second terminal device according to the request information, where the response signaling includes the media supported by the second terminal device that sends the response signaling Codec capability set;
  • the step of the first terminal device sending the request signaling to the at least one second terminal device includes:
  • the first terminal device sends request signaling to the at least one second terminal device through the IP Multimedia Subsystem IMS.
  • the response signaling is session initial protocol signaling or session description protocol signaling.
  • the step of determining, according to the media codec capability set supported by the at least one second terminal device, the at least one of the second terminal devices, determining the first media codec includes:
  • the application further provides a computer readable storage medium storing computer executable instructions that are implemented when the computer executable instructions are executed.
  • an embodiment of the present invention provides a first terminal device, including:
  • the first sending module is configured to send request signaling to the at least one second terminal device, where the request signaling includes request information for acquiring a media codec capability set supported by the second terminal device;
  • the first receiving module is configured to receive the response signaling sent by the at least one second terminal device according to the request information, where the response signaling includes the second terminal device that sends the response signaling Media codec capability set;
  • the negotiation module is configured to negotiate with at least one of the second terminal devices that send the response signaling according to at least one media codec capability set supported by the second terminal device that sends the response signaling, to determine a media codec;
  • a processing module configured to perform mixing according to the first media codec and at least one audio signal of the second terminal device that sends the response signaling.
  • the first sending module is configured to:
  • the request signaling is sent to the at least one second terminal device through the IP Multimedia Subsystem IMS.
  • the negotiation module is configured to:
  • an embodiment of the present invention provides a method for negotiating a media codec, which is applied to a second terminal device, where the method includes:
  • the step of sending the response signaling to the first terminal device according to the request information includes:
  • the response signaling is sent to the first terminal device through the IP Multimedia Subsystem IMS.
  • the response signaling is session initial protocol signaling or session description protocol signaling.
  • the embodiment of the present invention provides a second terminal device, including:
  • the second receiving module is configured to receive the request signaling sent by the first terminal device, where the request signaling includes request information for acquiring a media codec capability set of the second terminal device;
  • the second sending module is configured to send the response signaling to the first terminal device according to the request information, where the response signaling includes a media codec capability set supported by the second terminal device.
  • the first terminal device when the media codec is negotiated, the first terminal device actively queries to obtain a media codec capability set of other terminal devices that are mixed with the media, and then, according to the acquired media codec capability set of the other terminal device, The media codec used in the negotiation is negotiated, thereby improving the efficiency of the codec of the negotiation media, and the quality of the audio signal of the terminal device is ensured when the signals of the plurality of terminal devices are mixed.
  • FIG. 1 is a flowchart of a method for negotiating media codec according to Embodiment 1 of the present invention
  • FIG. 2 is a flowchart of a first terminal device acquiring a media codec capability set of a second terminal device
  • FIG. 3 is a flow chart showing a method for device A, device B, and device C to perform renegotiation
  • FIG. 4 is a block diagram showing a first terminal device in Embodiment 2 of the present invention.
  • FIG. 5 is a flowchart of a method for negotiating media codec in Embodiment 3 of the present invention.
  • Figure 6 is a block diagram showing a second terminal device according to Embodiment 4 of the present invention.
  • the method for negotiating media codec of the related art has a low success rate, and multiple terminals are used.
  • the quality of the audio signal is affected, and a method and a terminal device for negotiating the media codec are provided.
  • the method for negotiating media codec in the first embodiment of the present invention includes:
  • Step 11 The first terminal device sends request signaling to the at least one second terminal device.
  • the request signaling includes request information for acquiring a media codec capability set supported by the second terminal device;
  • codec refers to an algorithm for encoding and compressing a signal at a transmitting end and decoding a signal at a receiving end in the transmission of an audio/video digital signal.
  • codec refers to an algorithm for encoding and compressing a signal at a transmitting end and decoding a signal at a receiving end in the transmission of an audio/video digital signal.
  • the request signaling is signaling for communication between the terminal devices, and is a conventional signaling, such as INVITE signaling, in which the query header is carried in the INVITE signaling, and the query header is set to notify the first
  • the second terminal device needs to obtain a set of media codec capabilities supported by the terminal device, wherein the query header is the request information.
  • Step 12 The first terminal device receives at least one response signaling sent by the second terminal device according to the request information.
  • the response signaling includes a media codec capability set supported by the second terminal device that sends the response signaling.
  • response signaling may be Session Initiation Protocol (SIP) signaling or Session Description Protocol (SDP) signaling.
  • SIP Session Initiation Protocol
  • SDP Session Description Protocol
  • Step 13 Determine, according to at least one media codec capability set supported by the second terminal device that sends the response signaling, to negotiate with the second terminal device that sends the response signaling to determine the first media.
  • Step 14 Mixing according to the first media codec and at least one audio signal of the second terminal device that sends the response signaling.
  • the first terminal device acquires the second terminal device by sending The request information of the media codec capability set is sent to the at least one second terminal device, and the media codec capability set of the second terminal device is determined according to the feedback of the at least one second terminal device, and then the media codec in both of them is supported.
  • a media codec performs renegotiation to achieve three-way (or more) audio signals for mixing.
  • step 11 in this embodiment includes:
  • the first terminal device sends request signaling to the at least one second terminal device through the IMS.
  • the first terminal device first sends the request signaling to the IMS, and then the IMS forwards the request signaling to the second terminal device. It should be noted that the IMS does not perform any processing on the request signaling, but only according to the first terminal device. The requirements are forwarded.
  • step 13 in this embodiment includes:
  • the media codec capability set of the second terminal device does not intersect with the media codec capability set of the first terminal device (that is, there is no common media codec), according to the preset configuration of the system.
  • the audio signal of the person is mixed.
  • device 1 acquires the media codec capability set of device 2 as ⁇ a, b, c ⁇ , and the media codec capability set of device 1 is ⁇ a, c, d ⁇ .
  • the device 1 and the device 2 each have a media codec of a and c. Therefore, one of the media codecs a and c is selected as the media codec of the device 1 and the device 2, and the audio signals of the two are mixed. .
  • the device 1 acquires the media codec capability set of the device 2 and the device 3 as ⁇ a, b, c ⁇ and ⁇ a, d, e ⁇ , respectively, and the media codec of the device 1
  • the capability set is ⁇ a, c, d ⁇ , and the media codec of device 1, device 2, and device 3 has ⁇ a ⁇ , therefore, a is selected as the media codec of device 1, device 2, and device 3, and three The audio signal of the person is mixed.
  • the process of the first terminal device acquiring the media coding capability set of the second terminal device includes:
  • Step 2.1 The first terminal device sends the INVITE signaling carrying the query header to the IMS server.
  • INVITE signaling is as follows:
  • INVITE sip:B@zte-telephone.com SIP/2.0 indicates the specific attribute of the signaling;
  • MediaSet:query indicates that the query header of the second terminal device media coding capability set needs to be obtained.
  • Step 2.2 After receiving the INVITE signaling of the first terminal device carrying the query header, the IMS server forwards the INVITE signaling to the second terminal device.
  • Step 2.3 After receiving the INVITE signaling forwarded by the IMS server, the second terminal device parses the INVITE signaling, and identifies the media coding capability set query header carried in the INVITE signaling, and the second terminal device allows the current The call is established, so in the response signaling replying to the INVITE signaling, the signal encoding header carries its own set of media codec capability;
  • the response signaling may be SIP signaling or SDP signaling.
  • SIP signaling When SIP signaling is used to send the media codec capability set, the signaling may be expressed as follows:
  • SIP/2.0 200OK is represented as SIP signaling with response of 200 OK;
  • MediaSet audio;
  • a g711a;
  • a g729;
  • the G711A and G729 are decoded for encoding and decoding, and the packing time is 20 milliseconds.
  • SIP/2.0 200 OK means to answer the signaling whose content includes 200 OK;
  • m audio 49172RTP/AVP 8 Media describing the session;
  • the SDP signaling carries the media codec capability set of the device itself, and the media port is set to *, and the result of querying the media codec capability set is identified.
  • Step 2.4 After receiving the response signaling of the query result of the media codec capability set sent by the second terminal device, the IMS server forwards the response signaling to the first terminal device.
  • the first terminal device parses the response signaling, and identifies the query result of the media codec capability set of the second terminal device carried in the response signaling, and the first terminal device obtains the media codec of the second terminal device.
  • the capability set is as follows:
  • the first terminal device may be any party of the call, for example, the calling device side or the called device side.
  • the method for the device A, the device B, and the device C to mix the audio signals received by the three devices by using the foregoing method includes:
  • Step 3.11 The device A sends the first INVITE signaling carrying the query header to the IMS server.
  • Step 3.12 After receiving the first INVITE signaling carried by the query header of the device A, the IMS server forwards the first INVITE signaling to the device B.
  • Step 3.13 After receiving the first INVITE signaling forwarded by the IMS server, the device B parses the first INVITE signaling, and identifies the media encoding capability set query header carried in the first INVITE signaling, and the device B allows Establishing the current call, so in the first response signaling that is replied to the first INVITE signaling, the signaling header carries its own set of media codec capabilities;
  • Step 3.14 After receiving the first response signaling that is sent by the device B and carrying the query result, the IMS server forwards the first response signaling to the device A, and then the device A parses the first response signaling to identify
  • the media codec capability set of the device B carried in the first response signaling includes the G729 and the G711A, and the media codec capability of the device A supports the G711A, the G711U, and the G729. Therefore, the device A and the device B select the media codec G729 to perform the call.
  • Step 3.15 Device A sends a second INVITE signaling carrying a query header to the IMS server.
  • Step 3.16 after receiving the second INVITE signaling of the device A carrying the query header, the IMS server forwards the second INVITE signaling to the device C.
  • Step 3.17 After receiving the second INVITE signaling forwarded by the IMS server, the device C parses the second INVITE signaling, and identifies the media coding capability set query header carried in the second INVITE signaling, and the device C allows Establishing the current call, so in the second response signaling that responds to the second INVITE signaling, the signaling header carries its own set of media codec capabilities;
  • Step 3.18 After receiving the second response signaling sent by the device C and carrying the query result, the IMS server forwards the second response signaling to the device A, and then the device A parses the second response signaling to identify
  • the media codec capability set of the device C carried in the second response signaling includes the G711U and the G711A, and the media codec capability of the device A supports the G711A, the G711U, and the G729. Therefore, the device A and the device C select the media codec G711U to perform the call.
  • steps 3.11 to 3.14 are steps for session negotiation between device A and device B
  • steps 3.15 to 3.18 are steps for session negotiation between device A and device C. It should be noted that the two processes can be simultaneously And; in order to distinguish signaling sent between different devices, the INVITE signaling and the response signaling are marked with the first and second, respectively.
  • device A After device A obtains the media codec capability set of device B and device C, respectively, device A selects a media codec G711A from the intersection of the media codec capability set of device B and device C as the mix of the three devices. Codec, and then notify device B and device C to renegotiate separately.
  • the specific steps are as follows:
  • Step 3.19 The device A sends a third INVITE signaling carrying the codec supported by the media renegotiation to the IMS server.
  • Step 3.20 The IMS server sends the received third INVITE signaling to the device B.
  • Step 3.21 The device A sends a fourth INVITE signaling carrying the codec supported by the media renegotiation to the IMS server.
  • Step 3.22 The IMS server sends the received fourth INVITE signaling to the device C.
  • Step 3.23 Device B receives the third INVITE signaling, because the media codec G711A is the media codec supported by the device B, so the content replies with the third response signaling including 200 OK, and confirms that the media codec G711A is used for encoding and decoding. ;
  • Step 3.24 after receiving the third response signaling replied by the device B, the IMS server forwards the third response signaling to the device A;
  • Device A receives the third response signaling forwarded by the IMS server, and device A and device B use the media codec G711A to talk;
  • Step 3.25 the device C receives the fourth INVITE signaling, because the media codec G711A is the media codec supported by the device C, so the content replies with the fourth response signaling including 200 OK, and confirms that the media codec G711A codec is used;
  • Step 3.26 after receiving the fourth response signaling replied by the device C, the IMS server forwards the fourth response signaling to the device A;
  • the device A receives the fourth response signaling forwarded by the IMS server, and the device A and the device C use the media codec G711A to make a call, thereby realizing the mixing between the device A, the device B, and the device C using the media codec G711A.
  • the first terminal device when negotiating the media codec, the first terminal device actively queries to obtain a media codec capability set of other terminal devices that are mixed with the media, and then according to the acquired The media codec capability set of the terminal device negotiates the mixing codec, thereby improving the efficiency of the negotiation medium codec, and ensuring the audio signal between the terminal devices when the audio signals of the plurality of terminal devices are mixed.
  • the query request is carried by the signaling of the related art, and no additional signaling is required, which does not cause additional resource overhead.
  • Embodiments of the present invention further provide a computer readable storage medium storing computer executable instructions that are implemented when the computer executable instructions are executed.
  • the second embodiment of the present invention provides a first terminal device, including:
  • the first sending module 41 is configured to send request signaling to the at least one second terminal device, where the request signaling includes request information for acquiring a media codec capability set supported by the second terminal device;
  • the first receiving module 42 is configured to receive the response signaling sent by the at least one second terminal device according to the request information, where the response signaling includes the second terminal device that sends the response signaling.
  • Media codec capability set
  • the negotiation module 43 is configured to determine, according to the at least one media codec capability set supported by the second terminal device that sends the response signaling, to negotiate with the at least one second terminal device that sends the response signaling, to determine First media codec;
  • the processing module 44 is configured to mix the audio signal of the second terminal device that sends the response signaling according to the first media codec.
  • the first sending module 41 is configured to:
  • the request signaling is sent to the at least one second terminal device through the IP Multimedia Subsystem IMS.
  • the response signaling is session initial protocol signaling or session description protocol signaling.
  • the negotiation module 43 is configured to:
  • the first terminal device in this embodiment is the terminal device corresponding to the method for negotiating the media codec in the first embodiment, and all the implementation manners in the first embodiment are applicable to the first terminal device in the second embodiment. And the same technical effects as in the first embodiment can be obtained.
  • the method for negotiating media codec in the third embodiment of the present invention is applied to a second terminal device, where the method includes:
  • Step 51 Receive request signaling sent by the first terminal device.
  • the request signaling includes request information for acquiring a media codec capability set of the second terminal device
  • Step 52 Send response signaling to the first terminal device according to the request information.
  • the response signaling includes a media codec capability set supported by the second terminal device.
  • step 52 includes:
  • the response signaling is sent to the first terminal device through the IP Multimedia Subsystem IMS.
  • the response signaling is session initial protocol signaling or session description protocol signaling.
  • the method for the negotiation of the media codec in the third embodiment, the fourth embodiment of the present invention provides a second terminal device, including:
  • the second receiving module 61 is configured to receive request signaling sent by the first terminal device, where the request signaling includes request information for acquiring a media codec capability set of the second terminal device;
  • the second sending module 62 is configured to send the response signaling to the first terminal device according to the request information, where the response signaling includes a media codec capability set supported by the second terminal device.
  • the second sending module 62 is configured to:
  • the response signaling is sent to the first terminal device through the IP Multimedia Subsystem IMS.
  • the response signaling is session initial protocol signaling or session description protocol signaling.
  • the second terminal device in this embodiment is a terminal device that uses the method for negotiating media codec in the third embodiment, and all implementation manners in the third embodiment are applicable to the second terminal device in the embodiment. And the same technical effects as those in the third embodiment can be obtained.
  • each module/unit in the above embodiment may be implemented in the form of hardware, for example, by implementing an integrated circuit to implement its corresponding function, or may be implemented in the form of a software function module, for example, executing a program stored in the memory by a processor. / instruction to achieve its corresponding function.
  • Embodiments of the invention are not limited to any specific form of combination of hardware and software.
  • the first terminal device when the media codec is negotiated, the first terminal device actively queries to obtain the media codec capability set of other terminal devices that are mixed with the media, and then according to the obtained media formats supported by the other terminal devices.
  • the decoding capability set negotiates the media codec used in the mixing, thereby improving the efficiency of the negotiation medium codec, and ensuring the quality of the audio signal of the terminal device when mixing the audio signals of the plurality of terminal devices.

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Abstract

一种协商媒体编解码的方法及终端设备。所述协商媒体编解码的方法，包括：该第一终端设备接收至少一个发送应答信令的第二终端设备根据该请求信息发送的应答信令，该应答信令中包含发送所述应答指令的第二终端设备所支持的媒体编解码能力集；根据至少一个发送所述应答信令的第二终端设备所支持的媒体编解码能力集，与至少一个发送所述应答信令的第二终端设备协商，确定第一媒体编解码；根据该第一媒体编解码与至少一个发送所述应答信令的第二终端设备的音频信号进行混音。提高了协商媒体编解码的成功率，在将多个终端设备的音频信号进行混音时，保证了终端设备的音频信号的质量。

Description

一种协商媒体编解码的方法，及一种终端设备 技术领域
本申请涉及但不限于通信技术领域，特别是一种协商媒体编解码的方法，及一种应用该方法的终端设备。
背景技术
在IMS(IP Multimedia Subsystem，IP多媒体子系统)网络中，当通信的设备需要协商媒体编解码能力时，通常采用如下方式进行：
方式1、设备A将其媒体编解码能力发送给与其通信的设备B，然后设备B根据设备A的媒体编解码能力集确定二者使用的媒体编解码(codec)，并将此媒体编解码发送给设备A；
此种方式的问题为：当与设备A连接的另一设备C要与设备B一同将三个设备的音频信号进行混音时，因设备A不能完整的获取设备B和设备C的媒体编解码能力集，会造成设备B和设备C虽然有公共的媒体编解码集，但因反馈给设备A的媒体编解码不同，使得在对三个设备的音频信号进行混音时，三者会使用2种媒体编解码以与其他设备混音，此种方式对设备芯片的能力要求较高，甚至会影响到混音质量；而如果使用某一种媒体编解码进行混音，可能会由于某一设备不支持该媒体编解码从而导致媒体协商失败。
方式2、当设备A与设备B进行媒体编解码协商时，设备A会发送专用的查询信令给设备B，以查询设备B的媒体编解码能力；
此种方式的问题为：因该查询信令会先向网络(例如，符合TCP/IP的网络)发送，大量的查询信令会增加网络中各种设备的负担，同时，网络中的各种设备并不是将所有的查询信令均进行转发，在网络中的各种设备未将查询信令成功转发时，不一定准确地协商设备A与设备B之间的媒体编解码能力。
发明内容
以下是对本文详细描述的主题的概述。本概述并非是为了限制权利要求的保护范围。
本申请提供一种协商媒体编解码的方法及终端设备，用以解决相关技术的媒体编解码协商方式会造成协商成功率低，在多方混音时，会存在影响混音质量的问题。
在一个方面，本发明实施例提供一种协商媒体编解码的方法，应用于第一终端设备，包括：
第一终端设备发送请求信令给至少一个第二终端设备，所述请求信令中包含获取所述第二终端设备所支持的媒体编解码能力集的请求信息；
所述第一终端设备接收至少一个所述第二终端设备根据所述请求信息发送的应答信令，所述应答信令中包含发送所述应答信令的所述第二终端设备所支持的媒体编解码能力集；
根据至少一个发送所述应答信令的所述第二终端设备所支持的媒体编解码能力集，与至少一个发送所述应答信令的所述第二终端设备协商，确定第一媒体编解码；
根据所述第一媒体编解码，与至少一个发送所述应答信令的所述第二终端设备的音频信号进行混音。
可选地，所述第一终端设备发送请求信令给至少一个第二终端设备的步骤包括：
所述第一终端设备通过IP多媒体子系统IMS发送请求信令给至少一个第二终端设备。
可选地，所述应答信令为会话初始协议信令或会话描述协议信令。
可选地，所述根据至少一个所述第二终端设备所支持的媒体编解码能力集，与至少一个所述第二终端设备协商，确定第一媒体编解码的步骤包括：
若确定在至少一个所述第二终端设备所支持的媒体编解码能力集与所述第一终端设备的媒体编解码能力集之间存在交集，则获取所述第一终端设备与至少一个所述第二终端设备均支持的第一媒体编解码。
本申请另外提供一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被执行时实现上述方法。
在另一个方面，本发明实施例提供一种第一终端设备，包括：
第一发送模块，设置成发送请求信令给至少一个第二终端设备，所述请求信令中包含获取所述第二终端设备所支持的媒体编解码能力集的请求信息；
第一接收模块，设置成接收至少一个所述第二终端设备根据所述请求信息发送的应答信令，所述应答信令中包含发送所述应答信令的所述第二终端设备所支持的媒体编解码能力集；
协商模块，设置成根据至少一个发送所述应答信令的所述第二终端设备所支持的媒体编解码能力集，与至少一个所述发送所述应答信令的第二终端设备协商，确定第一媒体编解码；
处理模块，设置成根据所述第一媒体编解码与至少一个发送所述应答信令的所述第二终端设备的音频信号进行混音。
可选地，所述第一发送模块设置成：
通过IP多媒体子系统IMS发送请求信令给至少一个第二终端设备。
可选地，所述协商模块是设置成：
若确定在至少一个所述第二终端设备所支持的媒体编解码能力集与所述第一终端设备的媒体编解码能力集之间存在交集，则获取所述第一终端设备与至少一个所述第二终端设备均支持的第一媒体编解码。
在又一个方面，本发明实施例提供一种协商媒体编解码的方法，应用于第二终端设备，所述方法包括：
接收第一终端设备发送的请求信令，所述请求信令中包含获取第二终端设备的媒体编解码能力集的请求信息；
根据所述请求信息，发送应答信令给所述第一终端设备，所述应答信令中包含所述第二终端设备所支持的媒体编解码能力集。
可选地，所述根据所述请求信息，发送应答信令给所述第一终端设备的步骤包括：
通过IP多媒体子系统IMS发送应答信令给所述第一终端设备。
可选地，所述应答信令为会话初始协议信令或会话描述协议信令。
在再一个方面，本发明实施例提供一种第二终端设备，包括：
第二接收模块，设置成接收第一终端设备发送的请求信令，所述请求信令中包含获取第二终端设备的媒体编解码能力集的请求信息；
第二发送模块，设置成根据所述请求信息，发送应答信令给所述第一终端设备，所述应答信令中包含所述第二终端设备所支持的媒体编解码能力集。
本申请的有益效果是：
根据上述方案，在协商媒体编解码时，第一终端设备主动查询从而获取与其进行混音的其它终端设备的媒体编解码能力集，然后依据获取的所述其它终端设备的媒体编解码能力集，协商混音时所用的媒体编解码，从而提高了协商媒体编解码的效率，在将多个终端设备的信号进行混音时，保证了终端设备的音频信号的质量。
在阅读并理解了附图和详细描述后，可以明白其他方面。
附图概述
图1表示本发明实施例一的协商媒体编解码的方法的流程图；
图2表示第一终端设备获取第二终端设备的媒体编解码能力集的流程图；
图3表示设备A、设备B和设备C进行重协商的方法的流程图；
图4表示本发明实施例二中的第一终端设备的框图；
图5表示本发明实施例三中的协商媒体编解码的方法的流程图；
图6表示本发明实施例四的第二终端设备的框图。
本发明的较佳实施方式
下面将结合附图及具体实施例对本申请进行详细描述。
本申请针对相关技术的协商媒体编解码的方法成功率低，在将多个终端 设备的音频信号进行混音时，影响音频信号的质量的问题，提供一种协商媒体编解码的方法及终端设备。
实施例一
如图1所示，本发明实施例一中的协商媒体编解码的方法，包括：
步骤11，第一终端设备发送请求信令给至少一个第二终端设备；
其中，所述请求信令中包含获取所述第二终端设备所支持的媒体编解码能力集的请求信息；
在本申请中，编解码(codec)的是指音视频数字信号的传输中，在发送端对信号进行编码、压缩，在接收端对信号进行解码的算法，详见《中国电信家庭网关与增强型终端综合管理系统接口技术要求V4.0》。
需要说明的是，该请求信令为终端设备之间进行通信的信令，为常规的信令，如INVITE信令，在该INVITE信令中携带查询头部，该查询头部设置成告知第二终端设备需要获取它所支持的媒体编解码能力集，其中，该查询头部即为所述的请求信息。
步骤12，所述第一终端设备接收至少一个所述第二终端设备根据所述请求信息发送的应答信令；
其中，所述应答信令中包含发送所述应答信令的所述第二终端设备所支持的媒体编解码能力集；
需要说明的是，该应答信令可以为会话初始协议(Session Initiation Protocol，简称为SIP)信令或会话描述协议(Session Description Protocol，简称为SDP)信令。
步骤13，根据至少一个发送所述应答信令的所述第二终端设备所支持的媒体编解码能力集，与至少一个发送所述应答信令的所述第二终端设备协商，确定第一媒体编解码；
步骤14，根据所述第一媒体编解码与至少一个发送所述应答信令的所述第二终端设备的音频信号进行混音。
需要说明的是，本实施例中，第一终端设备通过发送获取第二终端设备 的媒体编解码能力集的请求信息给至少一个第二终端设备，并根据至少一个第二终端设备的反馈确定第二终端设备的媒体编解码能力集，然后对在它们均支持的媒体编解码里的一种媒体编解码进行重协商，实现三方(或更多方)的音频信号进行混音。
需要说明的是，通常第一终端设备和第二终端设备在通信时，需要由IMS进行信息的转发，因此，可选地，本实施例中的步骤11包括：
所述第一终端设备通过IMS发送请求信令给至少一个第二终端设备。
第一终端设备首先将请求信令发送给IMS，然后由IMS将请求信令转发给第二终端设备，需要说明的是，此处IMS不对该请求信令进行任何处理，只是依照第一终端设备的需求进行转发。
可选地，本实施例中所述步骤13包括：
若确定在至少一个所述第二终端设备所支持的媒体编解码能力集与所述第一终端设备的媒体编解码能力集之间存在交集，则获取所述第一终端设备与至少一个所述第二终端设备均支持的第一媒体编解码。
需要说明的是，当第二终端设备的媒体编解码能力集与第一终端设备的媒体编解码能力集没有交集(即二者没有共同的媒体编解码)时，依据系统的预设配置对二者的音频信号进行混音。
例如：当进行2个设备的混音时，设备1获取到设备2的媒体编解码能力集为{a、b、c}，而设备1的媒体编解码能力集为{a、c、d}，设备1和设备2均具有的媒体编解码为a和c，因此，在媒体编解码a和c中任选一个作为设备1和设备2的媒体编解码，进行二者的音频信号的混音。
当进行3个设备的混音时，设备1分别获取到设备2和设备3的媒体编解码能力集为{a、b、c}和{a、d、e}，而设备1的媒体编解码能力集为{a、c、d}，设备1、设备2和设备3均具有的媒体编解码为{a}，因此，选择a作为设备1、设备2和设备3的媒体编解码，对三者的音频信号进行混音。
如图2所示，第一终端设备获取第二终端设备的媒体编码能力集的过程包括：
步骤2.1、第一终端设备发送携带查询头部的INVITE信令给IMS服务器；
该INVITE信令的示例如下：
INVITE sip:B@zte-telephone.com SIP/2.0；
MediaSet:query；
其中，INVITE sip:B@zte-telephone.com SIP/2.0表示信令的具体属性；MediaSet:query表示需要获取第二终端设备媒体编码能力集的查询头部。
步骤2.2、IMS服务器收到第一终端设备的携带查询头部的INVITE信令后，将该INVITE信令转发给第二终端设备；
步骤2.3、第二终端设备收到IMS服务器转发的INVITE信令后，对该INVITE信令进行解析，识别出该INVITE信令中携带的媒体编码能力集查询头部，第二终端设备允许本次呼叫建立，因此在回复INVITE信令的应答信令里，通过信令头部携带自身的媒体编解码能力集；
应答信令可以是SIP信令或SDP信令，当采用SIP信令发送媒体编解码能力集时，信令可以表示如下：
SIP/2.0 200OK；
MediaSet:audio；a＝g711a；a＝g729；p＝20；
其中，SIP/2.0 200OK表示为应答为200OK的SIP信令；MediaSet:audio；a＝g711a；a＝g729；p＝20表示设备自身的媒体编解码能力集，该设备支持语音、支持按照媒体编解码G711A和G729进行编码和解码，且打包时长为20毫秒。
当采用SDP信令发送媒体编解码能力集时，信令可以表示如下：
SIP/2.0 200OK；
v＝0；
o＝UserA 2890844526 2890844526IN IP4here.com；
s＝Session SDP；
c＝IN IP4pc33.atlanta.com；
t＝0 0；
m＝audio 49172RTP/AVP 8；
a＝ptime:20；
a＝sendrecv；
m＝audio*RTP/AVP 8 18；
其中，SIP/2.0 200OK意为应答其内容包括200OK的信令；v＝0指示该SDP的协议版本；o＝UserA 2890844526 2890844526IN IP4here.com指示该会话的会话源；s＝Session SDP指示该会话的会话名；c＝IN IP4pc33.atlanta.com指示该会话的连接数据(Connection Information)；t＝0 0描述该会话的时间，指示该会话的起始时间和结束时间；m＝audio 49172RTP/AVP 8描述该会话的媒体；a＝ptime:20指示媒体描述中的属性；a＝sendrecv指示媒体描述的收发模式；m＝audio*RTP/AVP 8 18指示设备自身的媒体编码能力集的查询结果，其中，该设备的媒体端口号为*，可以实现按照媒体编解码G711A和G729进行编码和解码。
需要说明的是，在采用SDP信令时，在SDP信令中携带设备自身的媒体编解码能力集，通过将媒体端口置为*，标识查询媒体编解码能力集的结果。
步骤2.4、IMS服务器收到第二终端设备发送的携带有媒体编解码能力集的查询结果的应答信令后，将该应答信令转发给第一终端设备；
第一终端设备对该应答信令进行解析，识别出应答信令里携带的第二终端设备的媒体编解码能力集的查询结果，至此第一终端设备便获取了第二终端设备的媒体编解码能力集；需要说明的是，上述的第一终端设备可以为通话的任意一方，例如可以是主叫设备方，也可以是被叫设备方。
如图3所示，设备A、设备B和设备C应用上述方法对该三个设备接收的音频信号进行混音的方法包括：
步骤3.11、设备A发送携带有查询头部的第一INVITE信令给IMS服务器；
步骤3.12、IMS服务器收到设备A的携带查询头部的第一INVITE信令后，将该第一INVITE信令转发给设备B；
步骤3.13、设备B收到IMS服务器转发的第一INVITE信令后，对该第一INVITE信令进行解析，识别出该第一INVITE信令中携带的媒体编码能力集查询头部，设备B允许建立本次呼叫，因此在回复第一INVITE信令的第一应答信令里，通过信令头部携带自身的媒体编解码能力集；
步骤3.14、IMS服务器收到设备B发送的携带有查询结果的第一应答信令后，将该第一应答信令转发给设备A，然后设备A对该第一应答信令进行解析，识别出第一应答信令里携带的设备B的媒体编解码能力集包括G729和G711A，而设备A的媒体编解码能力支持G711A、G711U和G729，因此设备A和设备B选用媒体编解码G729进行通话；
步骤3.15、设备A发送携带有查询头部的第二INVITE信令给IMS服务器；
步骤3.16、IMS服务器收到设备A的携带查询头部的第二INVITE信令后，将该第二INVITE信令转发给设备C；
步骤3.17、设备C收到IMS服务器转发的第二INVITE信令后，对该第二INVITE信令进行解析，识别出该第二INVITE信令中携带的媒体编码能力集查询头部，设备C允许建立本次呼叫，因此在回复第二INVITE信令的第二应答信令里，通过信令头部携带自身的媒体编解码能力集；
步骤3.18、IMS服务器收到设备C发送的携带有查询结果的第二应答信令后，将该第二应答信令转发给设备A，然后设备A对该第二应答信令进行解析，识别出第二应答信令里携带的设备C的媒体编解码能力集包括G711U和G711A，而设备A的媒体编解码能力支持G711A、G711U和G729，因此设备A和设备C选用媒体编解码G711U进行通话；
需要说明的是，步骤3.11至步骤3.14为设备A与设备B进行会话协商的步骤，步骤3.15至步骤3.18为设备A与设备C进行会话协商的步骤，需要说明的是，这两个过程可以同时进行；并且为了区分不同设备间发送的信令，分别用第一和第二来标记INVITE信令和应答信令。
在设备A分别获取设备B和设备C的媒体编解码能力集后，设备A从与设备B和设备C的媒体编解码能力集的交集里选取一个媒体编解码G711A作为这三个设备的混音编解码，然后分别通知设备B和设备C进行重协商，具体的步骤为：
步骤3.19、设备A向IMS服务器发送携带媒体重协商共同支持的编解码的第三INVITE信令；
步骤3.20、IMS服务器将收到的第三INVITE信令发送给设备B；
步骤3.21、设备A向IMS服务器发送携带媒体重协商共同支持的编解码的第四INVITE信令；
步骤3.22、IMS服务器将收到的第四INVITE信令发送给设备C；
步骤3.23、设备B收到第三INVITE信令，因媒体编解码G711A是设备B支持的媒体编解码，因此回复其内容包括200OK的第三应答信令，确认使用媒体编解码G711A进行编码和解码；
步骤3.24、IMS服务器收到设备B回复的第三应答信令后，将该第三应答信令转发给设备A；
设备A收到IMS服务器转发的第三应答信令，设备A和设备B使用媒体编解码G711A通话；
步骤3.25、设备C收到第四INVITE信令，因媒体编解码G711A是设备C支持的媒体编解码，因此回复其内容包括200OK的第四应答信令，确认使用媒体编解码G711A编解码；
步骤3.26、IMS服务器收到设备C回复的第四应答信令后，将该第四应答信令转发给设备A；
设备A收到IMS服务器转发的第四应答信令，设备A和设备C使用媒体编解码G711A通话，由此便实现了设备A、设备B和设备C之间使用媒体编解码G711A进行混音。
根据上述方案，在协商媒体编解码时，第一终端设备主动查询从而获取与其进行混音的其它终端设备的媒体编解码能力集，然后依据获取的所述其 它终端设备的媒体编解码能力集，协商混音编解码，从而提高了协商媒体编解码的效率，在将多个终端设备的音频信号进行混音时，保证了终端设备之间的音频信号的质量；同时，本申请中，通过相关技术的信令携带查询请求，无需增加额外的信令，不会造成额外的资源开销。
本发明实施例另外提供一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被执行时实现上述方法。
实施例二
如图4所示，对应于实施例一的协商媒体编解码的方法，本发明实施例二提供一种第一终端设备，包括：
第一发送模块41，设置成发送请求信令给至少一个第二终端设备，所述请求信令中包含获取所述第二终端设备所支持的媒体编解码能力集的请求信息；
第一接收模块42，设置成接收至少一个所述第二终端设备根据所述请求信息发送的应答信令，所述应答信令中包含发送所述应答信令的所述第二终端设备所支持的媒体编解码能力集；
协商模块43，设置成根据至少一个发送所述应答信令的所述第二终端设备所支持的媒体编解码能力集，与至少一个发送所述应答信令的所述第二终端设备协商，确定第一媒体编解码；
处理模块44，设置成根据所述第一媒体编解码与至少一个发送所述应答信令的所述第二终端设备的音频信号进行混音。
可选地，所述第一发送模块41是设置成：
通过IP多媒体子系统IMS发送请求信令给至少一个第二终端设备。
可选地，所述应答信令为会话初始协议信令或会话描述协议信令。
可选地，所述协商模块43设置成：
若确定在至少一个所述第二终端设备所支持的媒体编解码能力集与所述第一终端设备的媒体编解码能力集之间存在交集，则获取所述第一终端设备与至少一个所述第二终端设备均支持的第一媒体编解码。
需要说明的是，本实施例的第一终端设备是与实施例一的协商媒体编解码的方法对应的终端设备，实施例一的所有实现方式均适用于实施例二中的第一终端设备，并且能获得与实施例一相同的技术效果。
实施例三
如图5所示，本发明实施例三的协商媒体编解码的方法，应用于第二终端设备，所述方法包括：
步骤51，接收第一终端设备发送的请求信令；
其中，所述请求信令中包含获取第二终端设备的媒体编解码能力集的请求信息；
步骤52，根据所述请求信息，发送应答信令给所述第一终端设备；
其中，所述应答信令中包含所述第二终端设备所支持的媒体编解码能力集。
可选地，步骤52包括：
通过IP多媒体子系统IMS发送应答信令给所述第一终端设备。
可选地，所述应答信令为会话初始协议信令或会话描述协议信令。
需要说明的是，上述实施例一中，所有关于第二终端设备的描述，均适用于该应用于第二终端设备的协商媒体编解码的方法，并且能获得与实施例一中的技术方案相同的技术效果。
实施例四
如图6所示，对应于实施例三的协商媒体编解码的方法，本发明实施例四提供一种第二终端设备，包括：
第二接收模块61，设置成接收第一终端设备发送的请求信令，所述请求信令中包含获取第二终端设备的媒体编解码能力集的请求信息；
第二发送模块62，设置成根据所述请求信息，发送应答信令给所述第一终端设备，所述应答信令中包含所述第二终端设备所支持的媒体编解码能力集。
可选地，第二发送模块62是设置成：
通过IP多媒体子系统IMS发送应答信令给所述第一终端设备。
可选地，所述应答信令为会话初始协议信令或会话描述协议信令。
需要说明的是，本实施例的第二终端设备是应用实施例三中的协商媒体编解码的方法的终端设备，实施例三的所有实现方式均适用于该实施例中的第二终端设备，并且能获得与实施例三中的技术方案相同的技术效果。
需要说明的是，本申请中所说的第一终端设备和第二终端设备的所有功能均可集成在同一终端设备中。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序来指令相关硬件(例如处理器)完成，所述程序可以存储于计算机可读存储介质中，如只读存储器、磁盘或光盘等。可选地，上述实施例的全部或部分步骤也可以使用一个或多个集成电路来实现。相应地，上述实施例中的各模块/单元可以采用硬件的形式实现，例如通过集成电路来实现其相应功能，也可以采用软件功能模块的形式实现，例如通过处理器执行存储于存储器中的程序/指令来实现其相应功能。本发明实施例不限制于任何特定形式的硬件和软件的结合。
以上所述的是本申请的可选实施方式，应当指出对于本技术领域的普通人员来说，在不脱离本申请所述的原理前提下还可以作出若干改进和润饰，这些改进和润饰也在本申请的保护范围内。
工业实用性
根据本申请的方案，在协商媒体编解码时，第一终端设备主动查询从而获取与其进行混音的其它终端设备的媒体编解码能力集，然后依据获取的所述其它终端设备所支持的媒体编解码能力集，协商混音时所用的媒体编解码，从而提高了协商媒体编解码的效率，在将多个终端设备的音频信号进行混音时，保证了终端设备的音频信号的质量。

Claims (11)

  1. 一种协商媒体编解码的方法，应用于第一终端设备，包括：
    第一终端设备发送请求信令给至少一个第二终端设备，所述请求信令中包含获取所述第二终端设备所支持的媒体编解码能力集的请求信息；
    所述第一终端设备接收至少一个所述第二终端设备根据所述请求信息发送的应答信令，所述应答信令中包含发送所述应答信令的所述第二终端设备所支持的媒体编解码能力集；
    根据至少一个发送所述应答信令的所述第二终端设备所支持的媒体编解码能力集，与至少一个发送所述应答信令的所述第二终端设备协商，确定第一媒体编解码；
    根据所述第一媒体编解码，与至少一个发送所述应答信令的所述第二终端设备的音频信号进行混音。
  2. 根据权利要求1所述的协商媒体编解码的方法，其中，所述第一终端设备发送请求信令给至少一个第二终端设备的步骤包括：
    所述第一终端设备通过IP多媒体子系统IMS发送请求信令给至少一个第二终端设备。
  3. 根据权利要求1或2所述的协商媒体编解码的方法，其中，所述应答信令为会话初始协议信令或会话描述协议信令。
  4. 根据权利要求1所述的协商媒体编解码的方法，其中，所述根据至少一个所述第二终端设备所支持的媒体编解码能力集，与至少一个所述第二终端设备协商，确定第一媒体编解码的步骤包括：
    若确定在至少一个所述第二终端设备所支持的媒体编解码能力集与所述第一终端设备的媒体编解码能力集之间存在交集，则获取所述第一终端设备与至少一个所述第二终端设备均支持的第一媒体编解码。
  5. 一种第一终端设备，包括：
    第一发送模块，设置成发送请求信令给至少一个第二终端设备，所述请求信令中包含获取所述第二终端设备所支持的媒体编解码能力集的请求信息；
    第一接收模块，设置成接收至少一个所述第二终端设备根据所述请求信息发送的应答信令，所述应答信令中包含发送所述应答信令的所述第二终端 设备所支持的媒体编解码能力集；
    协商模块，设置成根据至少一个发送所述应答信令的所述第二终端设备所支持的媒体编解码能力集，与至少一个发送所述应答信令的所述第二终端设备协商，确定第一媒体编解码；
    处理模块，设置成根据所述第一媒体编解码与至少一个发送所述应答信令的所述第二终端设备的音频信号进行混音。
  6. 根据权利要求5所述的第一终端设备，其中，所述第一发送模块是设置成：
    通过IP多媒体子系统IMS发送请求信令给至少一个第二终端设备。
  7. 根据权利要求5所述的第一终端设备，其中，所述协商模块是设置成：
    若确定在至少一个所述第二终端设备所支持的媒体编解码能力集与所述第一终端设备的媒体编解码能力集之间存在交集，则获取所述第一终端设备与至少一个所述第二终端设备均支持的第一媒体编解码。
  8. 一种协商媒体编解码的方法，应用于第二终端设备，所述方法包括：
    接收第一终端设备发送的请求信令，所述请求信令中包含获取第二终端设备的媒体编解码能力集的请求信息；
    根据所述请求信息，发送应答信令给所述第一终端设备，所述应答信令中包含所述第二终端设备所支持的媒体编解码能力集。
  9. 根据权利要求8所述的协商媒体编解码的方法，其中，所述根据所述请求信息，发送应答信令给所述第一终端设备的步骤包括：
    通过IP多媒体子系统IMS发送应答信令给所述第一终端设备。
  10. 根据权利要求8或9所述的协商媒体编解码的方法，其中，所述应答信令为会话初始协议信令或会话描述协议信令。
  11. 一种第二终端设备，包括：
    第二接收模块，设置成接收第一终端设备发送的请求信令，所述请求信令中包含获取第二终端设备的媒体编解码能力集的请求信息；
    第二发送模块，设置成根据所述请求信息，发送应答信令给所述第一终端设备，所述应答信令中包含所述第二终端设备所支持的媒体编解码能力集。
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