CN102412877A - Non-audio data transmission method based on A2DP (audio 2 device protocol) - Google Patents
Non-audio data transmission method based on A2DP (audio 2 device protocol) Download PDFInfo
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- CN102412877A CN102412877A CN2011104410853A CN201110441085A CN102412877A CN 102412877 A CN102412877 A CN 102412877A CN 2011104410853 A CN2011104410853 A CN 2011104410853A CN 201110441085 A CN201110441085 A CN 201110441085A CN 102412877 A CN102412877 A CN 102412877A
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Abstract
The invention provides a non-audio data transmission method based on an A2DP (audio 2 device protocol). The method is mainly characterized in that on the premise of not changing the existing Bluetooth related protocols, when a sending terminal embeds non-audio data into the head or tail of an SBC (subband coding) audio data packet so as to encapsulate the SBC audio data packet into an SBC data packet and transmits the SBC data packet to a receiving terminal through Bluetooth according to the A2DP, the receiving terminal separates the SBC audio data packet and the non-audio data out from the received SBC data packet according to a preset analysis rule, so that the receiving terminal can synchronously display the required non-audio data while displaying audio data, thus the Bluetooth-based aural reception experience of a user can be enriched.
Description
Technical field
The present invention relates to a kind of moving communicating field, particularly relate to a kind of non-audio data transmission method based on the A2DP agreement.
Background technology
Along with the quick decline of blue tooth products price, bluetooth equipment has obtained popularizing fast, and the device with Bluetooth function is also more and more general, and especially in field of mobile phones, bluetooth has almost become a kind of de facto standards configuration.
Current; Important function of bluetooth is utilized bluetooth high quality audio (A2DP) agreement that audio signal is sent to bluetooth from bluetooth output equipment (like mobile phone etc.) exactly and is play receiving equipment (like bluetooth earphone, Baffle Box of Bluetooth etc.), and wherein without any need for the physical connection of wired mode.People are enjoying the bluetooth high quality audio simultaneously easily conscientiously; But find to think further to improve and listen to but very inconvenience of experience; As can't be at bluetooth receiving terminal synchronously displaying lyrics or a series of attribute informations of audio frequency media itself, like album--name, song length, singer informations etc.
In order to improve the user experience of this respect, how a kind of non-audio data transmission method based on the A2DP agreement is proposed, it is very meaningful just to seem.
Summary of the invention
The shortcoming of prior art in view of the above; The object of the present invention is to provide a kind of non-audio data transmission method based on the A2DP agreement; With under the prerequisite of the related protocol that does not change existing bluetooth, but other non-audio data of real-time Transmission, and then enrich the experience of listening to that the user uses bluetooth.
For realizing above-mentioned purpose and other relevant purposes; The present invention provides a kind of non-audio data transmission method based on the A2DP agreement; It is applied in supports bluetooth approach to carry out between the transmitting terminal and receiving terminal of audio data transmission; And said voice data is the SBC packets of audio data that encapsulates according to the SBC standard, it is characterized in that said non-audio data transmission method based on the A2DP agreement comprises: at said transmitting terminal; Non-audio data is embedded in the packet header or the bag tail of said SBC packets of audio data, and is encapsulated as the SBC packet; At said transmitting terminal, after the normal pairing of bluetooth of transmitting terminal and receiving terminal, said SBC packet is carried out the wireless transmit transmission through said A2DP agreement through bluetooth; At said receiving terminal, receive said SBC packet through bluetooth through said A2DP agreement; And at said receiving terminal, the resolution rules that foundation one is preset is isolated SBC packets of audio data and non-audio data in the SBC packet that is received.
Wherein, the bag tail that non-audio data is embedded in said SBC packets of audio data only is suitable under the situation that said SBC packets of audio data sound intermediate frequency data do not take fully.This SBC packets of audio data comprises with the information of sync byte as first byte.This non-audio data is handled the data that do not comprise sync byte that obtain for protecting through bluetooth SBC code stream synchronization mechanism.This sync byte is 0x9C.Resolution rules that should be preset is for parsing the SBC packets of audio data according to said first byte information and said SBC standard, and what do not parse then is non-audio data.
As stated; Non-audio data transmission method based on the A2DP agreement of the present invention is on existing Bluetooth protocol basis (need not change Bluetooth protocol itself); The non-audio data that in through the blue tooth transmission audio frequency data, will transmit is embedded in the SBC packets of audio data in the lump, and is encapsulated as the SBC packet, and the non-audio data that embeds is extracted in the SBC packet at the bluetooth receiving terminal; So; Can enjoy the bluetooth high quality audio conscientiously simultaneously easily, and for example show non-audio data such as the lyrics synchronously, and further enrich the experience of listening to that the user uses bluetooth.
Description of drawings
Fig. 1 is shown as the operational flowchart of the non-audio data transmission method based on the A2DP agreement of the present invention.
The element numbers explanation
S10～S40 step
Embodiment
Below through specific instantiation execution mode of the present invention is described, those skilled in the art can understand other advantages of the present invention and effect easily by the content that this specification disclosed.The present invention can also implement or use through other different embodiment, and each item details in this specification also can be based on different viewpoints and application, carries out various modifications or change under the spirit of the present invention not deviating from.
See also Fig. 1.Need to prove; The diagram that is provided in the present embodiment is only explained basic conception of the present invention in a schematic way; Satisfy only show in graphic with the present invention in relevant assembly but not component count, shape and plotted when implementing according to reality; Kenel, quantity and the ratio of each assembly can be a kind of random change during its actual enforcement, and its assembly layout kenel also maybe be more complicated.
As shown in the figure; The present invention provides a kind of non-audio data transmission method based on the A2DP agreement; It is applied in supports bluetooth approach to carry out between the transmitting terminal and receiving terminal of audio data transmission, and said voice data is the SBC packets of audio data that encapsulates according to the SBC standard, and this SBC packets of audio data comprises with the information of sync byte as first byte; In the present embodiment, this sync byte is 0x9C.Below promptly the operating procedure of the non-audio data transmission method based on the A2DP agreement of the present invention is elaborated.
At first execution in step S10 at transmitting terminal, is embedded in the packet header or the bag tail of SBC packets of audio data with non-audio data, and is encapsulated as the SBC packet.Then, execution in step S20.Wherein, this non-audio data is handled the data that do not comprise sync byte that obtain for protecting through bluetooth SBC code stream synchronization mechanism.In addition, what need explain is that the bag tail that non-audio data is embedded in said SBC packets of audio data only is suitable under the situation that said SBC packets of audio data sound intermediate frequency data do not take fully.
In step S20,, after the normal pairing of bluetooth of transmitting terminal and receiving terminal, this SBC packet is carried out the wireless transmit transmission through the A2DP agreement through bluetooth at transmitting terminal.Then, execution in step S30.
In step S30,, receive this SBC packet through bluetooth through this A2DP agreement at receiving terminal.Then, execution in step S40.
In step S40, at receiving terminal, the resolution rules that foundation one is preset is isolated SBC packets of audio data and non-audio data in the SBC packet that is received.Wherein, this preset resolution rules is for parsing the SBC packets of audio data according to said first byte information and said SBC standard, and what do not parse then is non-audio data.
Use the non-audio data transmission method based on the A2DP agreement of the present invention for more detailed understanding and how when using the blue tooth transmission audio frequency data, to transmit other non-audio data in the lump, below take 2 examples and explain.
Example one: with 0,1,2,3,4,5,6,7, the packet header that 8,90 non-audio data are embedded in the SBC packets of audio data is that example describes.
At first; Protect processing not comprised 16 system data of sync byte through bluetooth SBC code stream synchronization mechanism non-audio data 0～9 this 10 number that needs transmit simultaneously; Be 0x30 to 0x39; Then, each non-audio data that takies a byte (8 bit) is embedded in the packet header of current SBC packets of audio data and is encapsulated as the SBC packet, the structural representation of this SBC packet such as following table 1:
Table 1
| 0x30 | 0x31 | 0x32 | 0x33 | …… | 0x39 | 0x9C | XXXX |
The sync byte of a SBC packets of audio data of 0x9C byte representation in the last table 1,0x30 to 0x39 in the table, promptly the data before the sync byte 0x9C are non-audio data, XXXX then representes the data of a SBC packets of audio data in the table.
Then, the bluetooth equipment of transmitting terminal and receiving terminal normally matches, and after normal pairing, in this transmitting terminal, the SBC packet that has encapsulated is carried out the wireless transmit transmission through the A2DP agreement through bluetooth.
Afterwards, at this receiving terminal, receive this SBC packet through bluetooth through this A2DP agreement.
At last; At this receiving terminal,, in the SBC packet that is received, isolate SBC packets of audio data and non-audio data according to preset resolution rules; Be about to 10 preceding data extracting of 0x9C sync byte and come out, and give corresponding audio decoder decode and playback the data that begin with 0x9C.
Example two: with under the situation about not taking fully in SBC packets of audio data sound intermediate frequency data with 0,1,2,3,4,5,6,7, the bag tail that 8,90 non-audio data are embedded in the SBC packets of audio data is that example describes.
At first; Protect processing not comprised 16 system data of sync byte through bluetooth SBC code stream synchronization mechanism non-audio data 0～9 this 10 number that needs transmit simultaneously; Then; Each non-audio data that takies a byte (8 bit) is embedded in the bag tail of current SBC packets of audio data and is encapsulated as the SBC packet, the structural representation of this SBC packet such as following table 2:
Table 2
| 0x9C | XXXX | 0x30 | 0x31 | 0x32 | 0x33 | …… | 0x39 |
The sync byte of a SBC packets of audio data of 0x9C byte representation in the last table 2, XXXX then representes the data of a SBC packets of audio data in the table, and 0x30 to 0x39 in the table, promptly the data after the data XXXX are non-audio data.
Then, the bluetooth equipment of transmitting terminal and receiving terminal normally matches, and after normal pairing, in this transmitting terminal, the SBC packet that has encapsulated is carried out the wireless transmit transmission through the A2DP agreement through bluetooth.
Afterwards, at this receiving terminal, receive this SBC packet through bluetooth through this A2DP agreement.
At last; At this receiving terminal; According to preset resolution rules, in the SBC packet that is received, isolate SBC packets of audio data and non-audio data, promptly obtain the effectively individual voice data XXXX that from sync byte 0x9C after, begins according to 0x9C sync byte information and SBC standard; And should be effectively a voice data XXXX give corresponding audio decoder decode and playback, and the data after the data XXXX are promptly separated and are non-audio data.
In sum; Non-audio data transmission method based on the A2DP agreement of the present invention mainly is with under the prerequisite of the related protocol that does not change existing bluetooth; The non-audio data that in the bluetooth playing audio-fequency data, will transmit is embedded in the SBC packets of audio data, and is encapsulated as the SBC packet, and the non-audio data that embeds is extracted in the SBC packet at the bluetooth receiving terminal and to get final product; So; Can enjoy the bluetooth high quality audio conscientiously simultaneously easily, and for example show non-audio data such as the lyrics synchronously, and further enrich the experience of listening to that the user uses bluetooth.
The foregoing description is illustrative principle of the present invention and effect thereof only, but not is used to limit the present invention.Any be familiar with this technological personage all can be under spirit of the present invention and category, the foregoing description is modified or is changed.Therefore, have common knowledge the knowledgeable in the affiliated such as technical field, must contain by claim of the present invention not breaking away from all equivalence modifications of being accomplished under disclosed spirit and the technological thought or changing.
Claims (5)
1. non-audio data transmission method based on the A2DP agreement; It is applied in supports bluetooth approach to carry out between the transmitting terminal and receiving terminal of audio data transmission; And said voice data is the SBC packets of audio data that encapsulates according to the SBC standard; It is characterized in that said non-audio data transmission method based on the A2DP agreement comprises:
At said transmitting terminal, non-audio data is embedded in the packet header or the bag tail of said SBC packets of audio data, and is encapsulated as the SBC packet;
At said transmitting terminal, after the normal pairing of bluetooth of transmitting terminal and receiving terminal, said SBC packet is carried out the wireless transmit transmission through said A2DP agreement through bluetooth;
At said receiving terminal, receive said SBC packet through bluetooth through said A2DP agreement; And
At said receiving terminal, the resolution rules that foundation one is preset is isolated SBC packets of audio data and non-audio data in the SBC packet that is received.
2. the non-audio data transmission method based on the A2DP agreement according to claim 1 is characterized in that: the bag tail that non-audio data is embedded in said SBC packets of audio data only is suitable under the situation that said SBC packets of audio data sound intermediate frequency data do not take fully.
3. the non-audio data transmission method based on the A2DP agreement according to claim 1 is characterized in that: said SBC packets of audio data comprises with the information of sync byte as first byte.
4. the non-audio data transmission method based on the A2DP agreement according to claim 1 is characterized in that: said non-audio data is handled the data that do not comprise sync byte that obtain for protecting through bluetooth SBC code stream synchronization mechanism.
5. the non-audio data transmission method based on the A2DP agreement according to claim 3; It is characterized in that: said preset resolution rules is for parsing the SBC packets of audio data according to said first byte information and said SBC standard, and what do not parse then is non-audio data.
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