CN102082633A - Method and device for positioning adaptive multi-rate (AMR) frame header, and player - Google Patents
Method and device for positioning adaptive multi-rate (AMR) frame header, and player Download PDFInfo
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Abstract
The embodiment of the invention discloses a method and a device for positioning an adaptive multi-rate (AMR) frame header, and a player and belongs to the field of AMR coding. The method comprises the following steps of: reading one byte of an AMR file randomly; judging whether bits identifying a frame type specified by an AMR standard in the read byte are the frame type specified by the AMR standard or not; and if the bits identifying the frame type specified by the AMR standard in the read byte are the frame type specified by the AMR standard, determining that the byte is the frame header. The device comprises a reading module, a judgment module and a positioning module. The player comprises a processor. According to the steps of the method, the frame header can be positioned from any position of the AMR file; the player adopting the frame header positioning technology can be played from any position; and the user experience is good.
Description
Technical field
The present invention relates to AMR (Adaptive Multi-Rate, adaptive multi-rate) coding field, the method and apparatus and the player of particularly a kind of AMR frame head location.
Background technology
AMR is by 3GPP (The Third Generation Partnership Project, third generation partner program) is absorbed as standard, be mainly used in following WCDMA (Wideband Code Division Multiple Access, Wideband Code Division Multiple Access (WCDMA)) mobile communication system.
The AMR file comprises file header and the unfixed frame of some length, and a frame comprises the frame head of a byte and the frame data of respective length.The universal search algorithm needs locating frame head, must begin locating frame head from file header at present, and detailed process comprises:
Read the file header of AMR file, first byte after the file header is a frame head, reads this frame head, and determines frame length according to the frame type of this frame head, reads the frame data with the corresponding length of this frame type, and frame data are decoded.
In realizing process of the present invention, the inventor finds that there is following problem at least in prior art:
Existing AMR frame head targeting scheme must begin locating frame head from the file header of AMR file, if from the optional position of AMR file, and then can not locating frame head.
Summary of the invention
For the optional position from the AMR file begins to carry out the frame head location, the embodiment of the invention provides the method and apparatus and the player of a kind of AMR frame head location.Described technical scheme is as follows:
The method of a kind of AMR frame head location, described method comprises:
Read byte in the adaptive multi-rate AMR file arbitrarily;
Judge in the byte that reads whether the position of the identification frames type of AMR standard code is the frame type of AMR standard code;
If the frame type of AMR standard code determines that described byte is a frame head.
The device of a kind of AMR frame head location, described device comprises:
Read module is used for reading arbitrarily byte of adaptive multi-rate AMR file;
Judge module is used for judging the byte that reads, and whether the position of the identification frames type of AMR standard code is the frame type of AMR standard code;
Locating module is used for if the frame type of AMR standard code determines that described byte is a frame head.
A kind of player, described player comprises processor, is used for
Read byte in the adaptive multi-rate AMR file arbitrarily;
Judge in the byte that reads whether the position of the identification frames type of AMR standard code is the frame type of AMR standard code;
If the frame type of AMR standard code determines that described byte is a frame head.
The beneficial effect that the technical scheme that the embodiment of the invention provides is brought is: by reading byte in the AMR file arbitrarily, whether the position of judging the identification frames type of AMR standard code in the byte that reads is the frame type of AMR standard code, if the frame type of AMR standard code, determine that this byte is a frame head, thereby realized that beginning to carry out frame head from the optional position of AMR file locatees.
Description of drawings
Fig. 1 is the method flow diagram of the AMR frame head location that provides in the embodiment of the invention 1;
Fig. 2 is the method flow diagram of the AMR frame head location that provides in the embodiment of the invention 2;
Fig. 3 is the apparatus structure schematic diagram of the AMR frame head location that provides in the embodiment of the invention 3;
Fig. 4 is another structural representation of device of the AMR frame head location that provides in the embodiment of the invention 3;
Fig. 5 is the player structural representation that provides in the embodiment of the invention 4.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
Embodiment 1
Referring to Fig. 1, present embodiment provides the method for a kind of AMR frame head location, comprising:
101: read byte in the AMR file arbitrarily;
Wherein, a byte comprises 8 bit positions.
102: judge in the byte that reads whether the position of the identification frames type of AMR standard code is the frame type of AMR standard code;
Wherein, the position of the identification frames type of AMR standard code at present comprises 4 bit positions, and referring to table 1, the 4-7 position of little-endian in the frame head binary representation (table 1 underscore sign) is the position of the identification frames type of AMR standard code.
103: if the frame type of AMR standard code determines that this byte is a frame head.
Further, the method for this AMR frame head location also comprises: read the AMR standard code and the hardwood data corresponding length of this hardwood type.
Further, read arbitrarily in the AMR file before the byte, natural number q=0 can also be set, q represents to be used for the number of frames of AMR frame head location, and then this step specifically comprises:
If the frame type of AMR standard code increases by 1 with q; Judge whether q reaches preset value,, determine that byte is a frame head if q reaches preset value.If q does not reach preset value, read the next bytes AMR standard code and the frame data corresponding length of frame type; Execution in step 102 once more.
Q can be any natural number, when q=1,, determine that then this byte is a frame head as long as judged result once is to be the frame type of AMR standard code, thereby finish the frame head location, but the accuracy of location is lower, during q=2, just can reach 75% accuracy, during q=3, just can reach 87.5% accuracy, during q=4, just can reach the accuracy more than 93%, during q=5, just can reach the accuracy more than 96%, q is big more, and the number of frames that is used for AMR frame head location is many more, also promptly the number of times of location is many more continuously, the frame head correct localization is high more, and therefore, the q when practical application in general 3 to 5 scopes can meet the demands.
Present embodiment is by reading byte in the AMR file arbitrarily, whether the position of judging the identification frames type of AMR standard code in the byte that reads is the frame type of AMR standard code, if the frame type of AMR standard code, determine that this byte is a frame head, thereby realized that beginning to carry out frame head from the optional position of AMR file locatees, further, the player of using this frame head location technology can begin from the optional position to play, user experience is good, and can improve the accuracy of frame head location by a plurality of frames are judged continuously.
Embodiment 2
Present embodiment improves based on embodiment 1, and referring to Fig. 2, the method for a kind of AMR frame head location that present embodiment provides comprises:
201: natural number p=0 is set, natural number q=0;
Wherein, p represents that the position of the identification frames type of AMR standard code from the byte that the AMR file reads is not the byte quantity of the frame type of AMR standard code.Q represents to be used for the number of frames of AMR frame head location.
202: read byte in the AMR file arbitrarily;
Wherein, the AMR file comprises file header and the unfixed frame of some length, and a frame comprises the frame head of a byte and the frame data of respective length, and corresponding, frame length is the byte quantity that comprises a frame of frame head and frame data.Concrete, referring to table 1, the AMR standard is supported 8 kinds of frames, the 4-7 position of little-endian in the frame head binary representation (table 1 underscore sign) is the position of the identification frames type of AMR standard code, the frame length of dissimilar frame correspondences frame sign in other words is different, for example, the maximum frame size of AMR standard support is 32, i.e. the frame length of frame type 0111 correspondence.
Table 1
203: judge in the byte that reads whether the position of the identification frames type of AMR standard code is the frame type of AMR standard code;
Concrete, if judged result is to be the frame type of AMR standard code, execution in step 204, if judged result is to be not the frame type of AMR standard code, execution in step 207;
204:, q is increased by 1 if judged result is to be the frame type of AMR standard code;
205: judge whether q reaches preset value;
Concrete, if q reaches preset value, determine that this byte is a frame head, finish the frame head location, flow process finishes; If q does not reach preset value, execution in step 206.
Further, q can be any natural number, when q=1, as long as judged result once is to be the frame type of AMR standard code, determine that then this byte is a frame head, thereby finish the frame head location, but the accuracy of location is lower, during q=2, just can reach 75% accuracy, during q=3, just can reach 87.5% accuracy, during q=4, just can reach the accuracy more than 93%, during q=5, just can reach the accuracy more than 96%, q is big more, the number of frames that is used for AMR frame head location is many more, and also promptly the number of times of location is many more continuously, and the frame head correct localization is high more, therefore, the q in general 3 to 5 scopes can meet the demands when practical application.
206: read the next bytes AMR standard code and the frame data corresponding length of this frame type, and execution in step 203 once more;
Further, can also read the AMR standard code and the frame data corresponding length of this frame type, and with the frame data decoding of reading.
207:, p is increased by 1, and read the next byte that this reads byte arbitrarily if judged result is provided with q=0 for being not the frame type of AMR standard code;
208: judge the maximum frame size whether p supports smaller or equal to the AMR standard, if, execution in step 203, if not, frame head location mistake, flow process finishes;
Wherein, the maximum frame size of AMR standard support is 32 at present.
Present embodiment is by reading byte in the AMR file arbitrarily, whether the position of judging the identification frames type of AMR standard code in the byte that reads is the frame type of AMR standard code, if the frame type of AMR standard code, determine that this byte is a frame head, thereby realized that beginning to carry out frame head from the optional position of AMR file locatees, further, the player of using this frame head location technology can begin from the optional position to play, user experience is good, and can improve the accuracy of frame head location by a plurality of frames are judged continuously.
Embodiment 3
Referring to Fig. 3, present embodiment provides the device of a kind of AMR frame head location, comprising:
Read module 301 is used for reading arbitrarily byte of adaptive multi-rate AMR file;
Judge module 302 is used for judging the byte that reads, and whether the position of the identification frames type of AMR standard code is the frame type of AMR standard code;
Locating module 303 is used for if the frame type of AMR standard code determines that this byte is a frame head.
Further, referring to Fig. 4, this device also comprises:
First is provided with module 304, is used to carry out before the read module 301, and natural number q=0 is set, and q represents to be used for the number of frames of AMR frame head location;
Locating module 303 specifically is used for if the frame type of AMR standard code increases by 1 with q; Judge whether q reaches preset value,, determine that this byte is a frame head if q reaches preset value.
Q can be any natural number, when q=1,, determine that then this byte is a frame head as long as judged result once is to be the frame type of AMR standard code, thereby finish the frame head location, but the accuracy of location is lower, during q=2, just can reach 75% accuracy, during q=3, just can reach 87.5% accuracy, during q=4, just can reach the accuracy more than 93%, during q=5, just can reach the accuracy more than 96%, q is big more, and the number of frames that is used for AMR frame head location is many more, also promptly the number of times of location is many more continuously, the frame head correct localization is high more, and therefore, the q when practical application in general 3 to 5 scopes can meet the demands.
Further, this device also comprises:
The circulation module is used to judge whether q reaches after the preset value, if q does not reach preset value, reads the next bytes AMR standard code and the frame data corresponding length of this frame type; Carry out judge module 302 once more.
Further, this device also comprises:
Second is provided with module 305, is used to carry out before the read module 301, and natural number p=0 is set, and p represents that the position of the identification frames type of AMR standard code from the byte that the AMR file reads is not the byte quantity of the frame type of AMR standard code;
Second judge module 306 is used to carry out after the judge module 302, if not the frame type of AMR standard code, natural number q=0 is set, and q represents to be used for the number of frames of AMR frame head location, and p is increased by 1, and reads the next byte that this reads byte arbitrarily; Judge the maximum frame size whether p supports smaller or equal to the AMR standard, if the maximum frame size that p supports smaller or equal to the AMR standard is carried out judge module 302 again, if the maximum frame size that p supports greater than the AMR standard, frame head location mistake.
The device that present embodiment provides specifically can be player or the processor that is built in player, belongs to same design with square embodiment, and its specific implementation process sees method embodiment for details, repeats no more here.
Present embodiment is by reading byte in the AMR file arbitrarily, whether the position of judging the identification frames type of AMR standard code in the byte that reads is the frame type of AMR standard code, if the frame type of AMR standard code, determine that this byte is a frame head, thereby realized that beginning to carry out frame head from the optional position of AMR file locatees, further, the player of using this frame head location technology can begin from the optional position to play, user experience is good, and can improve the accuracy of frame head location by a plurality of frames are judged continuously.
Embodiment 4
Referring to Fig. 5, present embodiment provides a kind of player, and this player comprises processor 401, is used for
Read byte in the adaptive multi-rate AMR file arbitrarily;
Judge in the byte that reads whether the position of the identification frames type of AMR standard code is the frame type of AMR standard code;
If the frame type of AMR standard code determines that byte is a frame head.
Further, processor 401 also is used for
Read arbitrarily in the adaptive multi-rate AMR file before the byte, natural number q=0 is set, q represents to be used for the number of frames of AMR frame head location;
If the frame type of AMR standard code determines that byte is that frame head comprises:
If the frame type of AMR standard code increases by 1 with q;
Judge whether q reaches preset value,, determine that byte is a frame head if q reaches preset value;
If q does not reach preset value, read the next bytes AMR standard code and the frame data corresponding length of frame type;
Whether the position of carrying out the identification frames type of judging AMR standard code in the byte that reads once more is the step of the frame type of AMR standard code.
Q can be any natural number, when q=1,, determine that then this byte is a frame head as long as judged result once is to be the frame type of AMR standard code, thereby finish the frame head location, but the accuracy of location is lower, during q=2, just can reach 75% accuracy, during q=3, just can reach 87.5% accuracy, during q=4, just can reach the accuracy more than 93%, during q=5, just can reach the accuracy more than 96%, q is big more, and the number of frames that is used for AMR frame head location is many more, also promptly the number of times of location is many more continuously, the frame head correct localization is high more, and therefore, the q when practical application in general 3 to 5 scopes can meet the demands.
Further, processor 401 also is used for
Read arbitrarily in the AMR file before the byte, natural number p=0 is set, p represents that the position of the identification frames type of AMR standard code from the byte that the AMR file reads is not the byte quantity of the frame type of AMR standard code;
Whether the position of judging the identification frames type of AMR standard code in the byte read is to comprise after the frame type of AMR standard code:
If the position of the identification frames type of AMR standard code in the byte that reads is not the frame type of AMR standard code, natural number q=0 is set, q represents to be used for the number of frames of AMR frame head location, and p is increased by 1, and reads the next byte that reads byte arbitrarily;
Judge the maximum frame size whether p supports smaller or equal to the AMR standard, if the maximum frame size that p supports smaller or equal to the AMR standard, whether the position of carrying out the identification frames type of judging AMR standard code in the byte that reads is the step of the frame type of AMR standard code, if the maximum frame size that p supports greater than the AMR standard, frame head location mistake.
Player that present embodiment provides and method embodiment belong to same design, and its specific implementation process sees method embodiment for details, repeats no more here.
The player that present embodiment provides, its processor is by reading byte in the AMR file arbitrarily, whether the position of judging the identification frames type of AMR standard code in the byte that reads is the frame type of AMR standard code, if the frame type of AMR standard code, determine that this byte is a frame head, realized that beginning to carry out frame head from the optional position of AMR file locatees, thereby can begin from the optional position to play, user experience is good, and can improve the accuracy of frame head location by a plurality of frames are judged continuously.
All or part of content in the technical scheme that above embodiment provides can realize that its software program is stored in the storage medium that can read by software programming, storage medium for example: the hard disk in the computer, CD or floppy disk.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. the method for AMR frame head location is characterized in that described method comprises:
Read byte in the adaptive multi-rate AMR file arbitrarily;
Judge in the byte that reads whether the position of the identification frames type of AMR standard code is the frame type of AMR standard code;
If the frame type of AMR standard code determines that described byte is a frame head.
2. method according to claim 1 is characterized in that, described reading arbitrarily in the adaptive multi-rate AMR file comprises before a byte:
Natural number q=0 is set, and q represents to be used for the number of frames of AMR frame head location;
Described if the frame type of AMR standard code determines that described byte is a frame head, comprising:
If the frame type of AMR standard code increases by 1 with q;
Judge whether q reaches preset value,, determine that described byte is a frame head if q reaches preset value.
3. method according to claim 2 is characterized in that, the described q of judgement comprises after whether reaching preset value:
If q does not reach preset value, read the next bytes AMR standard code and the frame data corresponding length of described frame type;
Whether the position of carrying out the identification frames type of AMR standard code in the byte that described judgement reads is the step of the frame type of AMR standard code.
4. method according to claim 1 is characterized in that, described reading arbitrarily in the AMR file comprises before a byte:
Natural number p=0 is set, and p represents that the position of the identification frames type of AMR standard code from the byte that the AMR file reads is not the byte quantity of the frame type of AMR standard code;
In the byte that described judgement is read, whether the position of the identification frames type of AMR standard code is to comprise after the frame type of AMR standard code:
If not the frame type of AMR standard code, natural number q=0 is set, q represents to be used for the number of frames of AMR frame head location, and p is increased by 1, and reads the described next byte that reads byte arbitrarily;
Judge the maximum frame size whether p supports smaller or equal to the AMR standard, if the maximum frame size that p supports smaller or equal to the AMR standard, whether the position of carrying out the identification frames type of AMR standard code in the byte that described judgement reads is the step of the frame type of AMR standard code, if the maximum frame size that p supports greater than the AMR standard, frame head location mistake.
5. the device of AMR frame head location is characterized in that described device comprises:
Read module is used for reading arbitrarily byte of adaptive multi-rate AMR file;
Judge module is used for judging the byte that reads, and whether the position of the identification frames type of AMR standard code is the frame type of AMR standard code;
Locating module is used for if the frame type of AMR standard code determines that described byte is a frame head.
6. device according to claim 5 is characterized in that, described device also comprises:
First is provided with module, is used to carry out before the described read module, and natural number q=0 is set, and q represents to be used for the number of frames of AMR frame head location;
Described locating module specifically is used for if the frame type of AMR standard code increases by 1 with q; Judge whether q reaches preset value,, determine that described byte is a frame head if q reaches preset value.
7. device according to claim 6 is characterized in that, described device also comprises:
The circulation module is used to judge whether q reaches after the preset value, if q does not reach preset value, reads the next bytes AMR standard code and the frame data corresponding length of described frame type; Carry out described judge module once more.
8. device according to claim 5 is characterized in that, described device also comprises:
Second is provided with module, is used to carry out before the described read module, and natural number p=0 is set, and p represents that the position of the identification frames type of AMR standard code from the byte that the AMR file reads is not the byte quantity of the frame type of AMR standard code;
Second judge module is used to carry out after the described judge module, if not the frame type of AMR standard code, natural number q=0 is set, and q represents to be used for the number of frames of AMR frame head location, and p is increased by 1, and reads the described next byte that reads byte arbitrarily; Judge the maximum frame size whether p supports smaller or equal to the AMR standard, if the maximum frame size that p supports smaller or equal to the AMR standard is carried out described judge module again, if the maximum frame size that p supports greater than the AMR standard, frame head location mistake.
9. a player is characterized in that, described player comprises processor, is used for
Read byte in the adaptive multi-rate AMR file arbitrarily;
Judge in the byte that reads whether the position of the identification frames type of AMR standard code is the frame type of AMR standard code;
If the frame type of AMR standard code determines that described byte is a frame head.
10. player according to claim 9 is characterized in that described processor also is used for
Described reading arbitrarily in the adaptive multi-rate AMR file before the byte is provided with natural number q=0, and q represents to be used for the number of frames of AMR frame head location;
Described if the frame type of AMR standard code determines that described byte is that frame head comprises:
If the frame type of AMR standard code increases by 1 with q;
Judge whether q reaches preset value,, determine that described byte is a frame head if q reaches preset value;
If q does not reach preset value, read the next bytes AMR standard code and the frame data corresponding length of described frame type;
Whether the position of carrying out the identification frames type of AMR standard code in the byte that described judgement reads once more is the step of the frame type of AMR standard code.
11. player according to claim 9 is characterized in that, described processor also is used for
Described reading arbitrarily in the AMR file before the byte is provided with natural number p=0, and p represents that the position of the identification frames type of AMR standard code from the byte that the AMR file reads is not the byte quantity of the frame type of AMR standard code;
Whether the position of the identification frames type of AMR standard code in the byte that described judgement is read is to comprise after the frame type of AMR standard code:
If the position of the identification frames type of AMR standard code in the byte that reads is not the frame type of AMR standard code, natural number q=0 is set, q represents to be used for the number of frames of AMR frame head location, and p is increased by 1, and reads the described next byte that reads byte arbitrarily;
Judge the maximum frame size whether p supports smaller or equal to the AMR standard, if the maximum frame size that p supports smaller or equal to the AMR standard, whether the position of carrying out the identification frames type of AMR standard code in the byte that described judgement reads is the step of the frame type of AMR standard code, if the maximum frame size that p supports greater than the AMR standard, frame head location mistake.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010613720.7A CN102082633B (en) | 2010-12-27 | 2010-12-27 | Method and device for positioning adaptive multi-rate (AMR) frame header, and player |
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| CN201010613720.7A CN102082633B (en) | 2010-12-27 | 2010-12-27 | Method and device for positioning adaptive multi-rate (AMR) frame header, and player |
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Cited By (1)
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| CN106095910A (en) * | 2016-06-08 | 2016-11-09 | 广东欧珀移动通信有限公司 | The label information analytic method of a kind of audio file, device and terminal |
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| CN101107781A (en) * | 2004-10-22 | 2008-01-16 | 马维尔国际贸易有限公司 | Encoding and error correction system for enhanced performance of legacy communications networks |
| CN101814973A (en) * | 2010-01-29 | 2010-08-25 | 深圳市融创天下科技发展有限公司 | RTP rapid packet accumulation method based on AMR audio frame |
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| US20050226227A1 (en) * | 2004-04-12 | 2005-10-13 | Samsung Electronics Co., Ltd. | Apparatus and method for processing voice packet data in a mobile communication system providing voice service using packet network |
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| CN1964250A (en) * | 2006-11-23 | 2007-05-16 | 华为技术有限公司 | Data frame type identification method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106095910B (en) * | 2016-06-08 | 2018-01-19 | 广东欧珀移动通信有限公司 | Label information analytic method, device and the terminal of a kind of audio file |
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| CN102082633B (en) | 2014-04-16 |
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