CN102142924A - Versatile audio code (VAC) transmission method and device - Google Patents
Versatile audio code (VAC) transmission method and device Download PDFInfo
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Abstract
The invention discloses a versatile audio code (VAC) transmission method and device. The method comprises: a coding application terminal formulates a code control strategy according to input setting information; after receiving audio data, the coding application terminal generates a code control identifier according to the code control strategy, and codes the received audio data into VAC data; and the coding application terminal multiplexes the code control identifier and the VAC data into a VAC frame, forms a VAC transport stream from multiple VAC frames and sends the VAC transport stream to a decoding application terminal. According to the invention, the audio frame coding, transmission and decoding can be realized based on different technical schemes according to the information such as user setting, application scene, client feedback and the like.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of multipurpose audio encoding transmission method and device.
Background technology
In low complex degree, gradable multipurpose voice encoding and decoding frequently field, G.718 only support the embedded graduated encoding and the transmission in arrowband and broadband.G.719 support the coding and the transmission of full band low complex degree, but do not support hierarchical pattern.G.722.1 only support the coding and the transmission of broadband, the low multiplicity of ultra broadband.Therefore, CCSA's (China Communications Standards Association is called for short CCSA) proposes the multipurpose voice scheme of codec (Versatile Audio Codec is called for short VAC) frequently.
In the existing VAC technical scheme, can only adopt the method coding of signal classification, that is: input audio signal is divided into: voice, music, noise, quiet, again according to the audio signal type of importing, determine coding such as bandwidth Control Parameter, according to the coding Control Parameter to audio data coding.This method is more single to the control mode of coding, and flexibility is very poor.
Summary of the invention
The technical problem to be solved in the present invention proposes a kind of multipurpose audio encoding transmission method and device exactly, solves the single problem of coding control mode in the prior art.
In order to solve the problems of the technologies described above, the invention provides a kind of method of multipurpose audio encoding transmission, comprising:
The coding application end is formulated the coding control strategy according to the configuration information of input;
After described coding application end receives voice data, generate coding control sign, the audio data coding that receives is become the VAC data according to described coding control strategy;
Described coding application end will be encoded, and control identifies and the VAC data multiplex is the VAC frame, and a plurality of VAC frames are formed the VAC transport stream, sends to the decoding application end.
Further, said method also can have following characteristics:
Described configuration information comprises configuration information and application controls information;
The step that described coding application end is formulated the coding control strategy according to the configuration information of input specifically is meant: described coding application end is selected the coding control mode according to configuration information;
Wherein, described coding control mode is: encode according to application controls information and/or audio signal classification.
Further, said method also can have following characteristics:
Described application controls information comprises one or more in the following information:
(1) user customized information;
(2) service customizing information;
(3) feedback information of decoding application end.
Further, said method also can have following characteristics:
If described application controls information is user customized information, the coding control mode is for to encode according to application controls information, and then described coding application end directly generates coding control sign according to user customized information;
Wherein, described user customized information comprises encoder sign and coding Control Parameter.
Further, said method also can have following characteristics:
If described application controls information is service customizing information, the coding control mode is for to encode according to application controls information, and the step that then described coding application end generates coding control sign comprises:
Determine coding mode according to type of service, determine encoder bit rate according to business demand;
According to coding mode and code rate selection coding Control Parameter, and then select encoder;
Generate coding control sign according to encoder sign and coding Control Parameter.
Further, said method also can have following characteristics:
If described application controls information is the feedback information of decoding application end, the coding control mode is for to encode according to application controls information, and then described coding application end selects to satisfy the encoder and the coding Control Parameter of described feedback information, generates coding control sign.
Further, said method also can have following characteristics:
Described coding Control Parameter comprises: coding mode, sample rate, sound channel and frame type.
Further, said method also can have following characteristics:
Coding control sign comprises that VAC parameter identification, described VAC parameter identification comprise encoder sign and coding parameter;
Described coding parameter is used to indicate coding mode, sample rate, sound channel and frame type; When coding parameter is represented when self-defined, described coding control sign also comprises the VAC configuration information;
When coding mode is embedded when gradable, described coding control sign also comprises the VAC rating information.
In order to solve the problems of the technologies described above, the invention provides a kind of device of multipurpose audio encoding transmission, comprise coding control module, coding module and VAC transmission flow multiplex module,
Described coding control module is used for formulating the coding control strategy according to the configuration information of input, and, after receiving voice data, generate coding control sign, and described coding control sign is sent to coding module and VAC transmission flow multiplex module according to described coding control strategy;
Described coding module is used for according to coding control sign the audio data coding that receives being become the VAC data;
It is the VAC frame that described VAC transmission flow multiplex module is used for coding control sign and VAC data multiplex, and a plurality of VAC frames are formed the VAC transport stream, sends to the decoding application end.
Further, said apparatus also can have following characteristics:
Described configuration information comprises configuration information and application controls information;
Described coding control module is further used for selecting the coding control mode according to configuration information;
Wherein, described coding control mode is: encode according to application controls information and/or audio signal classification.
The present invention can realize according to information such as user's setting, application scenarios and client feedback, presses the different technologies scheme to language audio frame coding, transmission, decoding.In addition, the present invention supports a plurality of codecs, can select encoder according to configuration information, can support leniently to take to full range band, gradable audio coding decoding function like this.
Description of drawings
Fig. 1 is the transmitting terminal and the receiving terminal schematic diagram of the embodiment of the invention;
Fig. 2 is the schematic diagram of the coding control module input and output of the embodiment of the invention;
Fig. 3 is the flow chart of the multipurpose audio encoding transmission method of the embodiment of the invention;
Fig. 4 is that the VAC frame of the embodiment of the invention is formed schematic diagram;
Fig. 5 is that the VAC transport stream of the embodiment of the invention is formed schematic diagram;
Fig. 6 is the flow chart of the multipurpose voice frequency coding/decoding method of the embodiment of the invention.
Embodiment
The present invention is described in detail below in conjunction with drawings and the specific embodiments.
The present invention introduces with the encoder techniques scheme with reference to " source encoding working group makes a Summary for the 06th time ", " multipurpose voice encoding and decoding (VAC) frequently standard ToR ".As shown in Figure 1, be the transmitting terminal and the receiving terminal schematic diagram of the embodiment of the invention.
Wherein, transmitting terminal comprises coding control module for coding application end (being the device of multipurpose audio encoding transmission), coding module and VAC transmission flow multiplex module,
Coding control module is used for formulating the coding control strategy according to the configuration information of input, and, after receiving voice data, generate profile (coding control sign), and profile is sent to coding module and VAC transmission flow multiplex module according to described coding control strategy;
Coding module is used for according to profile the audio data coding that receives being become the VAC data;
It is the VAC frame that VAC transmission flow multiplex module is used for profile and VAC data multiplex, and a plurality of VAC frames are formed the VAC transport stream, sends to the decoding application end.
With reference to figure 2, the configuration information of input coding control module comprises configuration information and application controls information; Described coding control module can be selected the coding control mode according to configuration information; The coding control mode can be: according to application controls information encode, according to audio signal classification encode, according to application controls information and audio signal classification mode such as encode.
Coding module comprises one or more encoders, can select encoder according to the profile of coding control module output and encodes.
Receiving terminal comprises VAC transmission flow demultiplexing module and decoder module for the decoding application end;
VAC transmission flow demultiplexing module is used to receive the VAC transport stream, parses the VAC frame, and, resolve the VAC frame, obtain profile and VAC data;
Decoder module is used for the VAC data parsing is become voice data.
Wherein, decoder module can comprise one or more decoders, can choose decoder according to profile, decodes.
Be described in further detail coding application end and decoding application end below and carry out the process of encoding and decoding.
As shown in Figure 3, the coding application end is carried out following steps:
Step 301 is formulated the coding control strategy according to the configuration information of input;
Wherein, configuration information comprises configuration information and application controls information;
The coding application end can be selected the coding control mode according to configuration information, and described coding control mode is: encode according to application controls information and/or audio signal classification;
Encode and can be divided into according to application controls information and audio signal classification: application controls priority height or signal classification priority are high two kinds, and configuration information is coding control method sign, shown in the table specific as follows:
Table 1 coding control method sign
Application controls information can be one or more in the following information:
(1) user customized information;
(2) service customizing information;
(3) feedback information of decoding application end.
Step 302, receive voice data after, generate profile (coding control sign) according to described coding control strategy, the audio data coding that receives is become the VAC data;
Profile comprises the VAC parameter identification, also may comprise VAC configuration information and VAC rating information.
The VAC parameter identification comprises encoder sign and coding parameter;
Coding parameter is used to indicate coding Control Parameter such as coding mode, sample rate, sound channel and frame type;
Coding parameter can adopt as giving a definition:
When coding parameter was represented self-defined (being 0), profile also comprised the VAC configuration information;
The VAC configuration information can include but not limited to: parameters such as coding mode, sample rate, channel number, bandwidth, frame type:
Coding mode comprises embedded gradable and low complex degree multi code Rate of Chinese character;
Sample rate includes but not limited to 16kHz, 32kHz, 48kHz;
Channel number includes but not limited to monophony, stereo;
Bandwidth includes but not limited to broadband [50Hz, 7000Hz], ultra broadband [50Hz, 14000Hz], full band [20Hz, 20000Hz];
The frame type definition comprises but does not limit following content:
When coding mode is embedded when gradable, profile also comprises the VAC rating information, and the VAC rating information can comprise: parameters such as classification is initial, classification counting, rank value sign:
Classification is initial to include but not limited to 1 to 13;
Classification counting comprises but not in 1 to 13;
The rank value sign comprises acquiescence classification and self-defined rank value:
The default value of L1-L13
Rank value 1 is represented the length value of 1 to the n level made by oneself to rank value n.
(1) when the coding control mode when encoding according to application controls information, according to application controls Information Selection encoder and coding Control Parameter, and then generate profile, and, the audio data coding that receives is become the VAC data according to encoder and coding Control Parameter;
Wherein, the coding Control Parameter comprises parameters such as coding mode, sample rate, sound channel, frame type.
(a) when application controls information is user customized information, the user is parameter such as input coding device sign and coding Control Parameter directly, and the coding application end can directly generate profile according to user customized information;
(b) when application controls information is service customizing information, the step that the coding application end generates profile comprises:
(b.1) determine coding mode according to type of service, determine encoder bit rate according to business demand;
Wherein, the corresponding relation of type of service and coding mode can reference:
(b.2), and then select encoder according to coding mode and code rate selection coding Control Parameter;
If when this parameter only has an encoder to realize, choose this encoder; When if a plurality of encoders are all realized, then according to the encoder of selection of parameter performance index the bests such as algorithm time-delay, algorithm complex and coding quality;
(b.3) generate profile according to encoder sign and coding Control Parameter.
(c) when described application controls information is the feedback information of decoding application end, the coding application end selects to satisfy the encoder of described feedback information and the Control Parameter of encoding, and generates profile, specifically can comprise:
(c.1) exist under decoding application end and the coding application end channel prerequisite, the decoding application end sends parameters such as encoder complexity, time-delay, code check according to the decoding capability of self to the coding application end;
When (c.2) the coding application end receives the feedback information of decoding application end,, select to generate the profile of performance index the best according to relevant parameters such as complexity, time-delay, code checks.
(2) when the coding control mode is encoded for classifying according to audio signal, comprise the steps:
(2.1) input audio signal is by signal sorting technique extraction of signal type: voice, music, noise, quiet etc.;
(2.2) according to signal type, broadband range chosen in voice, and music and noise are chosen ultra broadband and full band scope, the quiet frame type of then choosing the self-defining quiet frame of VAC parameter identification;
(2.3) bandwidth of obtaining according to the encoder bit rate and the input of configuration is determined encoder and coding Control Parameter;
Embedded gradable during with the low complex degree multi code Rate of Chinese character when existing simultaneously, all less low complex degree multi code Rate of Chinese character pattern of complexity time delay is selected in suggestion;
When existing a plurality of encoders to support this parameter simultaneously, the VAC encoder of best performance is chosen in suggestion by performance index;
(2.4) generate profile according to encoder sign of choosing and coding Control Parameter.
(3) when the coding control mode when classification is encoded according to application controls information and audio signal, can adopt following steps:
(3.1) generate profile1 according to the mode of encoding according to application controls information respectively, the mode of encoding according to the classification according to audio signal generates profile2;
Wherein, set forth, repeat no more herein according to the step front that application controls information is encoded and classification is encoded according to audio signal;
(3.2) when the signal sorting technique is checked through quiet frame, profile is that frame type is the self-defining configuration information of quiet frame; When application controls method priority was high, profile was mainly generated by profile1, and bandwidth, sample rate among the profile are obtained by profile2; When application controls method priority was high, profile was mainly generated by profile2, and the coding mode among the profile is obtained by profile1.
Step 303 is the VAC frame with profile and VAC data multiplex, and a plurality of VAC frames are formed the VAC transport stream, sends to the decoding application end.
Wherein, as shown in Figure 4, be the composition schematic diagram of VAC frame, wherein, the VAC frame comprises VAC frame head and VAC coded data, and wherein, the VAC frame head is profile, comprises the VAC parameter identification, also may comprise VAC configuration information and VAC rating information.The VAC data that the VAC coded data obtains for coding.
As shown in Figure 5, the VAC transport stream is made up of a plurality of VAC frames and VAC synchronization character.
In the process of coding, the coding application end can be according to the configuration information of input, real-time update coding control strategy.
As shown in Figure 6, the decoding application end is carried out following steps:
Step 601 receives the VAC transport stream, parses the VAC frame;
Step 602 is resolved the VAC frame, obtains profile and VAC data;
Step 603 is chosen decoder according to profile, and the VAC data parsing is become voice data.
Adjust coding strategy if desired and the signaling transmission channel of decoding application end to the coding application end arranged, the application end of then decoding sends feedback information to the coding application end.
In sum, the mode that the present invention adopts application controls method and signal sorting technique to combine, can realize according to information such as user's setting, application scenarios, client feedback and voice datas, press the different technologies scheme neatly language audio frame coding, transmission, decoding.In addition, the present invention can comprise a plurality of codecs, can support leniently to take to full range band, gradable audio coding decoding function.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. the method for multipurpose audio encoding transmission comprises:
The coding application end is formulated the coding control strategy according to the configuration information of input;
After described coding application end receives voice data, generate coding control sign, the audio data coding that receives is become multipurpose voice codec (VAC) data frequently according to described coding control strategy;
Described coding application end will be encoded, and control identifies and the VAC data multiplex is the VAC frame, and a plurality of VAC frames are formed the VAC transport stream, sends to the decoding application end.
2. the method for claim 1 is characterized in that,
Described configuration information comprises configuration information and application controls information;
The step that described coding application end is formulated the coding control strategy according to the configuration information of input specifically is meant: described coding application end is selected the coding control mode according to configuration information;
Wherein, described coding control mode is: encode according to application controls information and/or audio signal classification.
3. method as claimed in claim 2 is characterized in that,
Described application controls information comprises one or more in the following information:
(1) user customized information;
(2) service customizing information;
(3) feedback information of decoding application end.
4. method as claimed in claim 3 is characterized in that,
If described application controls information is user customized information, the coding control mode is for to encode according to application controls information, and then described coding application end directly generates coding control sign according to user customized information;
Wherein, described user customized information comprises encoder sign and coding Control Parameter.
5. method as claimed in claim 3 is characterized in that,
If described application controls information is service customizing information, the coding control mode is for to encode according to application controls information, and the step that then described coding application end generates coding control sign comprises:
Determine coding mode according to type of service, determine encoder bit rate according to business demand;
According to coding mode and code rate selection coding Control Parameter, and then select encoder;
Generate coding control sign according to encoder sign and coding Control Parameter.
6. method as claimed in claim 3 is characterized in that,
If described application controls information is the feedback information of decoding application end, the coding control mode is for to encode according to application controls information, and then described coding application end selects to satisfy the encoder and the coding Control Parameter of described feedback information, generates coding control sign.
7. as the described method of claim 4～6, it is characterized in that,
Described coding Control Parameter comprises: coding mode, sample rate, sound channel and frame type.
8. as the described method of claim 1～6, it is characterized in that,
Coding control sign comprises that VAC parameter identification, described VAC parameter identification comprise encoder sign and coding parameter;
Described coding parameter is used to indicate coding mode, sample rate, sound channel and frame type; When coding parameter is represented when self-defined, described coding control sign also comprises the VAC configuration information;
When coding mode is embedded when gradable, described coding control sign also comprises the VAC rating information.
9. the device of a multipurpose audio encoding transmission is characterized in that, comprises coding control module, coding module and VAC transmission flow multiplex module,
Described coding control module is used for formulating the coding control strategy according to the configuration information of input, and, after receiving voice data, generate coding control sign, and described coding control sign is sent to coding module and VAC transmission flow multiplex module according to described coding control strategy;
Described coding module is used for according to coding control sign the audio data coding that receives being become the VAC data;
It is the VAC frame that described VAC transmission flow multiplex module is used for coding control sign and VAC data multiplex, and a plurality of VAC frames are formed the VAC transport stream, sends to the decoding application end.
10. device as claimed in claim 9 is characterized in that,
Described configuration information comprises configuration information and application controls information;
Described coding control module is further used for selecting the coding control mode according to configuration information;
Wherein, described coding control mode is: encode according to application controls information and/or audio signal classification.
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