CN1870742A - Format conversion method of multimedia data - Google Patents
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- CN1870742A CN1870742A CN 200510034970 CN200510034970A CN1870742A CN 1870742 A CN1870742 A CN 1870742A CN 200510034970 CN200510034970 CN 200510034970 CN 200510034970 A CN200510034970 A CN 200510034970A CN 1870742 A CN1870742 A CN 1870742A
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Abstract
This invention provides a format conversion method for multimedia data, which converts MPEG video data to real time flow media data of H263 Baseline data, G711 or AMR data. By this invention, VCD and DVD media data with the most popularized materials at present can be converted to audio and video data formats needed by color ringing service to spread the selection of materials for color ringing services.
Description
Technical field
The invention belongs to digital processing field, relate in particular to the method that the MPEG audio, video data is converted to the real time flow medium formatted data.
Background technology
Ring Back Tone service is a kind of audible ringing tone service of personalization, utilizes the customization music tone ringer to replace the ring-back tone of traditional dullness.For the wideband multimedia terminal, as video telephone, 3G (Third Generation, 3-G (Generation Three mobile communication system)) portable terminal etc. when supporting CRBT, multimedia video data that can also the explicit user customization.
Radio phone terminal and 3G mobile all require to support the video encoding standard of H263 Baseline at present, and other video standards are option.The voice data standard of Ring Back Tone service is then disperseed relatively, as G711 form, AMR (Adaptive Multi Rate, adaptive multi-rate) form etc.
Because it is at present few based on the video data of H263, voice data based on G711 or AMR form is also few, therefore the material of Multimedia Ring Back Tone service is selected very limited, and VCD (Video CD, CD-Video) and DVD (Digital Video Disc, Digital video disc) MPEG (Moving PictureExpert Group such as, Motion Picture Experts Group) sound of form, video media-data is then very universal, and the audio frequency and video form that therefore mpeg data being converted to Multimedia Ring Back Tone service needs can solve the material of existing Multimedia Ring Back Tone service and select limited problem.
Summary of the invention
The objective of the invention is to mpeg data is converted to sound, the video formatted data of Multimedia Ring Back Tone service needs, the material that solves existing Multimedia Ring Back Tone service is selected limited problem.
In order to realize goal of the invention, the invention provides a kind of format conversion method of multi-medium data, described method comprises the steps:
A. carry out following operation, the MPEG video data is converted to H263 Baseline data;
A1. from the MPEG code stream, extract video data;
A2. be source images with described video data decoding;
A3. described source images is carried out H263 Baseline form coding;
B. carry out following operation, the mpeg audio data are converted to G711 or AMR data;
B1. from the MPEG code stream, extract voice data;
B2. described voice data is decoded as the dual track pcm stream;
B3. described pcm stream is converted to audio code stream;
B4. with described audio code stream boil down to G711 or AMR form;
C. with described H263 Baseline data and G711 or the processing of AMR data mixing, generate the real time flow medium data.
Described steps A 2 further comprises the steps:
A21. judging whether described video data has error code, is execution in step A22 then, otherwise execution in step A23;
A22. described video data is carried out error code correction;
A23. with described video data decoding complete source images yuv format data.
Described steps A 3 further comprises the steps:
A31. need judging whether frequency hopping to handle, is execution in step A1 then, otherwise execution in step A32;
A32. judging whether needs the changing image size, is execution in step A33 then, otherwise execution in step A34;
A33. the image size is carried out conversion;
A34. determine type of coding and quantizing factor;
A35. described source images is encoded to H263 Baseline form code stream;
A36. preserve after described H263 Baseline code stream being added the self-defined statistical information of these frame data.
Described step B3 further comprises the steps:
B31. described dual track pcm stream being carried out audio mixing handles;
B32. the code stream behind the described audio mixing is carried out low-pass filtering treatment;
B33. carry out the audio code stream after the described low-pass filtering treatment down-sampled.
Described step C further comprises the steps:
C1. read H263 Baseline video data;
C2. judge whether the video data processing finishes, and is then to finish, otherwise execution in step C3;
C3. judging whether this video data is first frame data, is execution in step C4 then, otherwise execution in step C5;
C4. the GOB information of counting with frame frequency, every frame writes the first frame mixed code stream;
C5. deposit frame head statistical information, frame data in mixed code stream;
C6. calculate this frame corresponding audio data length;
C7 reads the voice data of corresponding length and puts into mixed code stream.
Further object of the present invention is the MPEG video data is converted to the video formatted data that Multimedia Ring Back Tone service needs, and the video material that solves existing Multimedia Ring Back Tone service is selected limited problem.
In order to realize goal of the invention, the invention provides a kind of format conversion method of multimedia video data, described method comprises the steps:
A. extract the mpeg format video data;
B. be source images with described video data decoding;
C. described source images is carried out H263 Baseline form coding.
Described step B comprises the steps:
B1. judging whether described video data has error code, is execution in step B2 then, otherwise execution in step B3;
B2. described video data is carried out error code correction;
B3. with described video data decoding complete source images yuv format data.
Described step C comprises the steps:
C1. need judging whether frequency hopping to handle, is execution in step A then, otherwise execution in step C2;
C2. judging whether needs the changing image size, is execution in step C3 then, otherwise execution in step C4;
C3. the image size is carried out conversion;
C4. determine type of coding and quantizing factor;
C5. described source images is encoded to H263 Baseline form code stream;
C6. preserve after described H263 Baseline form code stream being added the self-defined statistical information of these frame data.
One object of the present invention also is the mpeg audio data are converted to the audio format data that Multimedia Ring Back Tone service needs, and the audio material that solves existing Multimedia Ring Back Tone service is selected limited problem.
In order to realize goal of the invention, the invention provides a kind of format conversion method of multimedia audio data, described method comprises the steps:
B1. from the MPEG code stream, extract voice data;
B2. described voice data is decoded as the dual track pcm stream;
B3. described pcm stream is converted to audio code stream;
B4. with described audio code stream boil down to G711 or AMR form;
Described step B3 comprises the steps:
B31. described dual track pcm stream is carried out audio mixing;
B32. the code stream behind the described audio mixing is carried out low-pass filtering treatment;
B33. carry out the audio code stream after the described low-pass filtering treatment down-sampled.
By the present invention, can with present material the most widely VCD, DVD media data be converted to sound, the video data format that Ring Back Tone service needs, the material that has solved existing Multimedia Ring Back Tone service is selected limited problem.
Description of drawings
Fig. 1 is the realization flow figure that among the present invention mpeg data is converted to the real time flow medium formatted data;
Fig. 2 is the realization flow figure that among the present invention the MPEG video data is converted to H263 Baseline data format;
Fig. 3 is the realization flow figure that among the present invention the mpeg audio data is converted to G711 or AMR data format;
Fig. 4 handles the realization flow figure that generates the stream media format data with H263 Baseline data and G7I1 or AMR data mixing among the present invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Because MPEG-1, the data of MPEG-2 form are to play fixed standard for storage file, its file format is based on whole file and is played and formulates under the prerequisite that device arranges fully, and the desired data format of Multimedia Ring Back Tone service is used for real-time broadcast, requirement is not done buffer memory and is play-overed under the situation that does not have the overall data content, so just need be with MPEG-1, the audio, video data of MPEG-2 form generates according to the form of real time flow medium class file, adopt H263 Baseline form for voice data, voice data for fixing video terminal adopts the G711 form, and adopt the AMR form for the voice data of 3G mobile, to support the application of present most of terminals.
Fig. 1 shows the flow process with the multi-medium data changing into stream medium data format of mpeg format:
Among the step S101, the video data of mpeg format is converted to the video data of H263 Baseline form;
Among the step S102, the voice data of mpeg format is converted to the voice data of G711 form or AMR form;
Among the step S103, with the voice data of the video data of described H263 form and described G711 form or AMR form look, the audio code stream mixed processing, thereby generate the real time flow medium data.
In said process, step S101 and S102 do not have absolute precedence, only for convenience of description, can certainly carry out the format conversion of voice data earlier, perhaps sound, video data are carried out format conversion simultaneously.
For the MPEG video data, at first be complete source images yuv data with decoding video stream, i.e. the yuv format data of 4:2:0, decode procedure is followed ISO/IEC11172,13818 video concerned standard, and the present invention quotes at this, repeats no more.If it is damaged to find that video code flow has in the decode procedure, scratch as video disc and the situation that mess code etc. can cause the mpeg decoder abnormal work to occur, then can do the damage compensation; If damage is relatively serious then directly with this frame and deleted by its frame of video that influences, and writes down affected video frame number, in order to the stationary problem of later processed voice, video.
Then, the source images of decoded yuv format is carried out H263 Baseline form coding, cataloged procedure is followed H.263 standard of ITU-T Recommendation, and the present invention quotes at this, repeats no more.
In cataloged procedure, at different application, need do different sampling processing to source images, as source images is CIF (Common Intermediate Format, general intermediate medium form) form, its resolution is 352 * 288, then at QCIF (quarter CIF, / 4th general intermediate medium forms) Video Applications of form is carried out sub-sampling with source images and is obtained encoding behind the image of 176 * 144 sizes; If for the Video Applications of CIF form, then directly source images being encoded according to the CIF form gets final product.
For different bandwidth demands, then in the H263 cataloged procedure, adopt the method for variable frame frequency and change quantized value size to come adaptive bandwidth requirement, can guarantee at the video quality that has under the bandwidth constraint condition like this.Do not having under the situation of bandwidth constraints, the H263 video coding can adopt fixedly frame frequency, code stream form as frame rate such as 25fps, 30fps, but under the situation of limited bandwidth system, if also keep same frame rate, the bandwidth that then every frame can allow will be very limited, so just must adopt very large quantizing factor to carry out the quantification treatment of this frame coding, thereby cause the serious decline of each frame of video quality, reduce the frame number of actual coding for this reason by frame-skipping, make the quality of frame of video of actual coding significantly to improve.
In the H263 video coding process, in order to improve the ability of the anti-error code of video code flow, the quantity that increases the I frame is a kind of effective method.The I frame has only carried out intraframe coding, and is not related with other frame of video, so just makes its influence that can not be subjected to other frame of video, makes its antijamming capability improve greatly.But because the I frame does not utilize the redundant information of interframe to encode, often the data code flow of I frame is comparatively huge, like this under the situation of limited bandwidth system, the time of transmission I frame is just longer, the big large time delay of time of the feasible transmission of result next frame, thereby allow the recipient feel beating of video frame frequency significantly, animation is sympathetic apparent in view, therefore the present invention adopts bigger quantizing factor to the I frame, effectively reduce the size of I frame, thereby make picture comparatively continuous, and the P frame that occurs continuously behind the I frame has video quality preferably, can compensate the I frame rapidly owing to the decrease in image quality that adopts the relatively largeization factor to bring.
Fig. 2 shows the realization flow that the data of MPEG-1, MPEG-2 form is converted to H263 Baseline formatted data.
Step S201 extracts one-frame video data;
Step S202 has judged whether error code, and then execution in step S203 is arranged; Otherwise execution in step S204;
Step S203 carries out error code correction or damage compensation;
Step S204 forms complete source images yuv data with the video code flow decoding;
Step S205 determines according to bandwidth whether the needs frame-skipping is handled, and then changes step S201 if desired over to, otherwise continues step S206;
Step S206 need to judge whether the changing image size, if desired, and execution in step S207 then, otherwise direct execution in step S208;
Step S207 carries out size conversion to source image data;
Step S208 determines this frame type of coding, promptly is I frame or P frame, and determines quantizing factor according to bandwidth requirement, and wherein the span of quantizing factor is 1～31;
Step S209 is encoded to H263 form code stream with these frame data;
Step S210, H263 code stream deposit after adding the self-defined statistical information of these frame data, and self-defined statistical information comprises the data word joint number of each GOB (Groups Of Blocks, piece group) in the byte number, frame of video of every frame video data;
Step S211 judges whether to also have or also need handle next frame, then change step S201 if desired over to, otherwise the video data processing finishes.
For the mpeg audio data, at first the audio stream with MPEG-1 or MPEG-2 is decoded as stereophony PCM (pulse-code modulation, Pulse Code Modulation) code stream, and decode procedure is followed ISO/IEC11172,13818 audio frequency relevant criterion, the present invention quotes at this, repeats no more.
Then, the dual track pcm stream is carried out audio mixing.Code stream behind the audio mixing obtains the audio code stream of a radio-frequency component below 4000Hz through being the fertile low pass filter Filtering Processing now of second order Bart of 3400Hz by frequency, the aliasing effect that can prevent from when down-sampled like this to be produced.
Then, will carry out down-sampledly through the audio code stream that low pass filter is handled, be 44100SPS for MPEG-1 audio code stream sample rate, then has more sample rate to select for the sample rate of MPEG-2 audio frequency, obtains the audio code stream of 8000SPS.
At last, the audio code stream that 8000SPS is down-sampled (16bits/Sample) is converted to the compressed format of G711 A rule or u rule, and transfer process is followed G.711 standard of ITU-T Recommendation, and the present invention quotes at this, repeats no more.For mobile application such as 3G, can be with down-sampled audio code stream boil down to AMR form, processing procedure is followed GSM AMR standard, and the present invention quotes at this, repeats no more.
Fig. 3 shows the realization flow that the mpeg audio data is converted to G711 form or AMR form:
Step S301 extracts voice data from the MPEG code stream;
Step S302 is decoded as dual track PCM data with audio code stream, 44100 sample rate 16bits precision;
Step S303, low pass filter filtering;
Step S304, it is down-sampled that the PCM data are carried out 8000SPS;
Step S305 carries out G711 or AMR coding with the down-sampled data that obtain;
Step S306 deposits coded audio data;
Step S307, whether the audio data processing finishes, if do not have, then changes step S301 over to, otherwise finishes.
Sound, video code flow for above acquisition obtain mixed code stream according to following form:
First frame data format:
| Title | Frame frequency | The GOB number | Frame head length | First GOB length | Second GOB length | … | Video data | Audio frequency length | Voice data |
| Length (BYTE) | 1 | 1 | 1 | 2 | 2 | Each GOB length summation | This frame diaphone audio data length (2BYTES) | Concrete voice data |
Second frame and subsequent frame form:
| Title | Frame head length | First GOB length | Second GOB length | … | Video data | Audio frequency length | Voice data |
| Length (BYTE) | 1 | 2 | 2 | Each GOB length summation | This frame diaphone audio data length (2BYTES) | Concrete voice data |
In the present invention, the media data that above-mentioned process is converted to, audio code stream is strictly play equably according to the speed of 8000SPS when playing, video code flow is then determined reproduction time according to TR (time reference value) value of every frame in the H263 code stream that generates, also be that audio frequency must be uniformly-spaced at the uniform velocity to play, and video is because the difference of video frame size, therefore the interval of TR is also inhomogeneous under the situation of bandwidth constraints, the frequency of occurrences of frame of video also changes during broadcast, but through the processing of algorithm, this inhomogeneities most of occasion people observe to come out basically.
Fig. 4 shows the handling process of audio frequency and video mixed code stream:
Among the step S401, read H263 Baseline video data;
Among the step S402, judge whether the video data processing finishes, and is then to finish, otherwise execution in step S403;
Among the step S403, judging whether this video data is first frame data, is execution in step S404 then, otherwise execution in step S405;
Among the step S404, the video informations such as GOB number of frame frequency, every frame are write the first frame mixed code stream;
Among the step S405, deposit frame head statistical information, these frame data in mixed code stream;
Among the step S406, calculate this frame corresponding audio data length;
Among the step S407, read the voice data of corresponding length and put into mixed code stream;
Among the step S408, the stream medium data after the mixed processing is preserved.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1, a kind of format conversion method of multi-medium data is characterized in that, described method comprises the steps:
A. carry out following operation, the MPEG video data is converted to H263 Baseline data;
A1. from the MPEG code stream, extract video data;
A2. be source images with described video data decoding;
A3. described source images is carried out H263 Baseline form coding;
B. carry out following operation, the mpeg audio data are converted to G711 or AMR data;
B1. from the MPEG code stream, extract voice data;
B2. described voice data is decoded as the dual track pcm stream;
B3. described pcm stream is converted to audio code stream;
B4. with described audio code stream boil down to G711 or AMR form;
C. with described H263 Baseline data and G711 or the processing of AMR data mixing, generate the real time flow medium data.
2, the format conversion method of multi-medium data as claimed in claim 1 is characterized in that, described steps A 2 further comprises the steps:
A21. judging whether described video data has error code, is execution in step A22 then, otherwise execution in step A23;
A22. described video data is carried out error code correction;
A23. with described video data decoding complete source images yuv format data.
3, the format conversion method of multi-medium data as claimed in claim 1 is characterized in that, described steps A 3 further comprises the steps:
A31. need judging whether frequency hopping to handle, is execution in step A1 then, otherwise execution in step A32;
A32. judging whether needs the changing image size, is execution in step A33 then, otherwise execution in step A34;
A33. the image size is carried out conversion;
A34. determine type of coding and quantizing factor;
A35. described source images is encoded to H263 Baseline form code stream;
A36. preserve after described H263 Baseline code stream being added the self-defined statistical information of these frame data.
4, the format conversion method of multi-medium data as claimed in claim 1 is characterized in that, described step B3 further comprises the steps:
B31. described dual track pcm stream being carried out audio mixing handles;
B32. the code stream behind the described audio mixing is carried out low-pass filtering treatment;
B33. carry out the audio code stream after the described low-pass filtering treatment down-sampled.
5, the format conversion method of multi-medium data as claimed in claim 1 is characterized in that, described step C further comprises the steps:
C1. read H263 Baseline video data;
C2. judge whether the video data processing finishes, and is then to finish, otherwise execution in step C3;
C3. judging whether this video data is first frame data, is execution in step C4 then, otherwise execution in step C5;
C4. the GOB information of counting with frame frequency, every frame writes the first frame mixed code stream;
C5. deposit frame head statistical information, frame data in mixed code stream;
C6. calculate this frame corresponding audio data length;
C7. read the voice data of corresponding length and put into mixed code stream.
6, a kind of format conversion method of multimedia video data is characterized in that, described method comprises the steps:
A. extract the mpeg format video data;
B. be source images with described video data decoding;
C. described source images is carried out H263 Baseline form coding.
7, the format conversion method of multimedia video data as claimed in claim 6 is characterized in that, described step B comprises the steps:
B1. judging whether described video data has error code, is execution in step B2 then, otherwise execution in step B3;
B2. described video data is carried out error code correction;
B3. with described video data decoding complete source images yuv format data.
8, the format conversion method of multimedia video data as claimed in claim 6 is characterized in that, described step C comprises the steps:
C1. need judging whether frequency hopping to handle, is execution in step A then, otherwise execution in step C2;
C2. judging whether needs the changing image size, is execution in step C3 then, otherwise execution in step C4;
C3. the image size is carried out conversion;
C4. determine type of coding and quantizing factor;
C5. described source images is encoded to H263 Baseline form code stream;
C6. preserve after described H263 Baseline form code stream being added the self-defined statistical information of these frame data.
9, a kind of format conversion method of multimedia audio data is characterized in that, described method comprises the steps:
B1. from the MPEG code stream, extract voice data;
B2. described voice data is decoded as the dual track pcm stream;
B3. described pcm stream is converted to audio code stream;
B4. with described audio code stream boil down to G711 or AMR form;
10, the format conversion method of multi-medium data as claimed in claim 9 is characterized in that, described step B3 further comprises the steps:
B31. described dual track pcm stream is carried out audio mixing;
B32. the code stream behind the described audio mixing is carried out low-pass filtering treatment;
B33. carry out the audio code stream after the described low-pass filtering treatment down-sampled.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102244788A (en) * | 2010-05-10 | 2011-11-16 | 索尼公司 | Information processing method, information processing device, scene metadata extraction device, loss recovery information generation device, and programs |
| CN102547432A (en) * | 2010-12-16 | 2012-07-04 | 中国移动通信集团广东有限公司 | Information processing system, method for processing multimedia information and system |
| CN102685469A (en) * | 2012-05-04 | 2012-09-19 | 北京航空航天大学 | Audio-video transmission code stream framing method based on moving picture experts group-2 (MPEG-2) advanced audio coding (AAC) and H.264 |
| CN113365108A (en) * | 2021-05-26 | 2021-09-07 | 联通沃音乐文化有限公司 | Audio and video transcoding system and method based on color ring back tone |
-
2005
- 2005-05-28 CN CN 200510034970 patent/CN1870742A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102244788A (en) * | 2010-05-10 | 2011-11-16 | 索尼公司 | Information processing method, information processing device, scene metadata extraction device, loss recovery information generation device, and programs |
| CN102244788B (en) * | 2010-05-10 | 2015-11-25 | 索尼公司 | Information processing method, information processor and loss recovery information generation device |
| CN102547432A (en) * | 2010-12-16 | 2012-07-04 | 中国移动通信集团广东有限公司 | Information processing system, method for processing multimedia information and system |
| CN102547432B (en) * | 2010-12-16 | 2015-07-29 | 中国移动通信集团广东有限公司 | Information processing system, method for processing multimedia information and system |
| CN102685469A (en) * | 2012-05-04 | 2012-09-19 | 北京航空航天大学 | Audio-video transmission code stream framing method based on moving picture experts group-2 (MPEG-2) advanced audio coding (AAC) and H.264 |
| CN113365108A (en) * | 2021-05-26 | 2021-09-07 | 联通沃音乐文化有限公司 | Audio and video transcoding system and method based on color ring back tone |
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