CN1933575A - Video recording method for photographic hand-held equipment - Google Patents
Video recording method for photographic hand-held equipment Download PDFInfo
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- CN1933575A CN1933575A CN 200610062912 CN200610062912A CN1933575A CN 1933575 A CN1933575 A CN 1933575A CN 200610062912 CN200610062912 CN 200610062912 CN 200610062912 A CN200610062912 A CN 200610062912A CN 1933575 A CN1933575 A CN 1933575A
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- 230000003139 buffering effect Effects 0.000 claims description 101
- 239000011121 hardwood Substances 0.000 claims description 22
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Abstract
A video recording method of hand shooting device includes applying two audio / video data buffer regions once from system RAM storage, placing audio / video data into the first audio / video data buffer region when audio / video recording is carried out, interchanging flag of the first and the second audio / video data buffer regions when the first audio / video data buffer region is full in order to use the first said region to store audio / video data continuously and write data in the second said region into flash storage for utilizing audio / video data buffer region in system RAM cyclically.
Description
[technical field]
The present invention relates to a kind of kinescope method, kinescope method when relating in particular to a kind of handheld device with camera function unlimited.
[background technology]
The handheld device of band camera function has mobile phone capable of taking pictures and PDA etc., and the principle of its photograph is basic identical.The disposal ability of these band camera function handheld devices generally a little less than, so whole hardware plan mostly is greatly: handheld device master chip+front end image processing chip (Backend IC)+imageing sensor (Sensor).Wherein Backend IC finishes the collection and the Jpeg compression of Sensor data.In order to make handheld device not only have camera function but also can to realize video recording, occurred using Motion Jpeg form to realize the technology of recording a video.Use the shortcoming of Motion Jpeg video recording to be, can't the synchronous recording audio file.The video recording of general Motion Jpeg is directly controlled by backend IC internal hardware, RAM among the Backend IC can only be used for keeping in all Motion Jpeg data, the handheld device end can not be controlled this RAM, this RAM can not be recycling, caused video time to be subjected to the size restriction of backend IC internal RAM, so can't realize video recording when unlimited.And Backend IC only comprises video processing unit, does not comprise audio treatment unit, and this has caused Voice ﹠ Video can't carry out synchronously again.
[summary of the invention]
The technical problem to be solved in the present invention provides a kind of photographic hand-held equipment under the prerequisite that does not increase the Mpeg4 compression chip, realizes the method for unlimited time video recording.
The technical problem that the present invention further will solve provides a kind of photographic hand-held equipment under the prerequisite that does not increase the Mpeg4 compression chip, realizes the method for audio-visual synchronized video recording.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is, a kind of kinescope method of photographic hand-held equipment, photographic hand-held equipment comprises handheld device master chip, front end image processing chip, imageing sensor, flash memory and the RAM of system memory, and described kinescope method may further comprise the steps:
Record the identical audio, video data buffering area of 2 sizes of disposable application in the RAM of system memory before 101. carry out audio frequency and video, the first audio, video data buffering area is used for keeping in the audio frequency and video data recording, and the second audio, video data buffering area is used for writing the audio frequency and video data recording to the flash memory;
102. carrying out when audio frequency and video record, audio, video data is put into the first audio, video data buffering area, when this buffering area is filled with, the first audio, video data buffering area is indicated with the exchange of the second audio, video data buffering area, the first audio, video data buffering area behind the exchange sign continues to deposit in the audio, video data of recording, the data of the second audio, video data buffering area behind the exchange sign write the flash memory, form recycling of the RAM of system memory middle pitch video data buffer.
The kinescope method of above-described a kind of photographic hand-held equipment, preferably further comprising the steps of: 201. carry out audio frequency and video sets up 2 files before recording in the flash memory, one is AVI audio, video data file, and another is an AVI data directory file;
202. in step 101, apply in the audio frequency and video data recording buffering area, apply for that 2 sizes are identical, and than the little index data buffering area of audio, video data buffering area, be used for keeping in the audio frequency and video index data, the first index data buffering area is used for keeping in index data, and the second index data buffering area is used for writing index data to the flash memory;
203. when every hardwood video data acquiring was finished, the voice data that this section recorded in the period formed a hardwood voice data simultaneously, and voice data and video data are inserted hardwood at interval, was temporarily stored in the first audio, video data buffering area;
204. calculate and generate the audio frequency and video index data according to every hardwood audio, video data size;
205. index data is put into the first index data buffering area, when this buffering area is filled with, the first index data buffering area is indicated with the exchange of the second index data buffering area, the first index data buffering area behind the exchange sign continues to deposit in the index data of recording, the data of the second index data buffering area behind the exchange sign write the flash memory, and the index data buffering area recycles in the formation RAM of the system memory;
206. when the data of the second audio, video data buffering area behind step 102 exchange sign write the flash memory, the audio, video data in the buffering area was saved in the AVI audio, video data file of flash memory;
207. when the data of the second index data buffering area behind step 205 exchange sign write the flash memory, the index data in the buffering area was saved in the AVI data directory file of flash memory;
208.203 the step cycle to 207 is carried out, video data is pressed the collection of timer interrupt timing, adopts constant video hardwood rate, and voice data uses the fixed rate collection;
209. record finish after, merge AVI audio, video data file and AVI data directory file, and generate the AVI head, form final AVI audio/video file.
The kinescope method of above-described a kind of photographic hand-held equipment, when being easy to act as most audio, video data recording and finishing, before carry out step 206, the Synchronous Processing buffered data is till writing all buffered datas AVI audio, video data file and AVI data directory file.
The present invention compared with prior art, taken into full account the slow shortcoming of flash memory (nand flash) writing rate, adopted the double buffering technology, preserve the video recording data in real time, improved the efficient of flash operation, video time can not be subjected to the restriction of backend IC internal RAM size, uses until exhausted up to the memory space of flash, thereby realizes recording function when unlimited.
Mentioned two RAM before and after this paper, the RAM among the above-mentioned backend IC is the ram space of photograph device, and this RAM is used for keeping in the data of taking pictures, and extracts for program.System RAM is the internal memory (embedded OS uses RAM more, Radom access memory) in the handheld device operating system, and this RAM generally is by embedded OS management, the space that can apply for dynamically and discharge.
Two avi files of the present invention such as further use are recorded the data and the index file of avi file simultaneously respectively, not only saved memory headroom, improved the efficient of algorithm, and adopting audio video interleaved is that container intersects record audio and video data synchronously, guarantee the Voice ﹠ Video data synchronization, can realize audio-visual synchronized video recording.
[description of drawings]
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Fig. 1 is the flow chart that the kinescope method audio frequency and video of a kind of photographic hand-held equipment of the present invention are recorded start-up course.
Fig. 2 is the flow chart of the kinescope method audio frequency and video recording process of a kind of photographic hand-held equipment of the present invention.
Fig. 3 is the flow chart that the kinescope method audio frequency and video of a kind of photographic hand-held equipment of the present invention are recorded terminal procedure.
The kinescope method audio frequency and video of a kind of photographic hand-held equipment of Fig. 4 the present invention are recorded the flow chart of background process process.
[embodiment]
The embodiment of the kinescope method of a kind of photographic hand-held equipment of the present invention can comprise 4 processes, i.e. start-up course, recording process, background process process and terminal procedure.
1. start-up course as shown in Figure 1.Whether system at first can satisfy the needs of recording in the space of check system RAM memory and flash memory when audio frequency and video were recorded start-up course and begun, and as for not, just finished start-up course, as for being, just set up avi file and buffering is regional:
Set up 2 files in the flash memory, one is used for preserving AVI video data and voice data, and another is an AVI data directory file.
The identical audio, video data buffering area of 2 sizes of disposable application in the RAM of system memory, the first audio, video data buffering area are used for keeping in the audio frequency and video data recording, and the second audio, video data buffering area is used for writing the audio frequency and video data recording to the flash memory.Simultaneously, apply for that 2 sizes are identical, and the index data buffering area littler than audio, video data buffering area, be used for keeping in the audio frequency and video index data, the first index data buffering area is used for keeping in index data, and the second index data buffering area is used for writing index data to the flash memory.
Just start the Voice ﹠ Video collection after finishing above-mentioned steps, and start the timer of audio frequency and video recording process, finish start-up course.
2. the audio frequency and video recording process as shown in Figure 2.
The audio frequency and video recording process is the process of a circulation, and circulation is adopted constant video hardwood rate by the timer interruption controls in the process of recording, and the method that voice data uses fixed rate to gather is gathered all voice datas.To check all whether the space of flash memory is sufficient during each circulation beginning,, just enter process ends and handle, as for being just to continue recording process as for not.
Video data in the collection present image transducer and the voice data in the audio buffer.When carrying out audio-video collection, record when finishing when every hardwood video data, the voice data that this section recorded in the period forms a hardwood voice data simultaneously, and voice data and video data are inserted hardwood at interval.
Above-mentioned audio buffer is a region of memory that is about the 40k size, writes data for the audio recording unit and uses.Program can read the audio recording data from this buffering area, and this buffering area can recycle simultaneously.About recycling of audio frequency buffering, multiple implementation method is also arranged, because audio buffer is a prior art, do not go through its specific implementation method here.
Check whether the first audio, video data buffering area is filled with, as be not filled with, deposit the audio, video data of having gathered in first audio, video data buffering area; Be filled with as the first audio, video data buffering area, just the first audio, video data buffering area is indicated both changing roles with the exchange of the second audio, video data buffering area.Simultaneously, send to the backstage processing procedure and write buffering message.And the audio, video data that will gather deposits the first audio, video data buffering area (the former second audio, video data buffering area) after exchange indicates in.
When audio, video data is preserved, use the data variable of the overall situation to calculate and generate the audio frequency and video index information according to every hardwood audio, video data size.When the index data here generates, be to have considered a reservation AVI space, and calculate and obtain behind the current position of recording hardwood; AVI zone that the space is a fixed size wherein, for example size can be 512 fixing bytes.
The same audio, video data of the way to play for time of audio frequency and video index data.Current formation index data is put into first index data buffering area, when this buffering area is filled with, the first index data buffering area is indicated with the exchange of the second index data buffering area.First index data buffering area behind the exchange sign continues to deposit in current index data, the data of the second index data buffering area behind the exchange sign are used for writing the flash memory in the background process process, and the index data buffering area recycles in the formation RAM of the system memory.
3. audio frequency and video are recorded the background process process as shown in Figure 4.
The background process process is controlled by background thread, when background thread is received the message of main thread, at first judges whether write buffering message.
If write buffering message, just the data with the second audio, video data buffering area write in the AVI audio, video data file of flash memory; The index data of the second index data buffering area is written in the AVI data directory file of flash memory, finishes the background process process.
If not writing buffering message, judge to be end again, if end, just the total data with the second audio, video data buffering area and the second index data buffering area writes the flash memory, removes the main thread obstruction after finishing and finishes the background process process.
4. audio frequency and video are recorded terminal procedure as shown in Figure 3.
Entering terminal procedure has multiple reason, initiatively finishes video recording as the user; Handheld device is carried out other operations, as mobile phone transmitting-receiving note, receives calls; Also can in recording process, enter by the system discovery inadequate resource.
Enter after the terminal procedure system at first the stop timing device interrupt and close the audio-video collection unit; Task sends end backward then, and block oneself, wait for the data in the background process buffering area, when the background process thread writes file with all buffered datas, after removing the main thread obstruction, terminal procedure merges AVI audio, video data file and AVI data directory file, and generates the AVI head, forms final AVI audio/video file.
Present embodiment has following characteristics:
1. utilize the AVI form as carrier, video adopts the jpeg form, and audio frequency adopts PCM form or AMR form, in the video process, to video time without limits, preserves the video recording data in real time, uses until exhausted up to memory space.
2. before the video recording beginning, set up two files respectively, one is the AVI data file, is used for preserving AVI video data and voice data, reserves the space of AVI head in the AVI data file, and another is the AVI index file, is used for preserving the AVI data directory.AVI index file and AVI data file are upgraded in video process simultaneously.When video recording is finished, two files are carried out merging, obtain final AVI audio/video file.
3. carry out audio frequency and video and record four identical buffering areas of disposable application two big two little difference before, wherein two big buffering areas are used for cushioning the audio frequency and video data recording, and two minibuffer districts are used for cushioning the audio frequency and video index data.
4. video data is taked to use timing acquiring, video acquisition circulates, and each timer carries out when triggering, and audio recording continues.When video acquisition, from audio buffer, obtain data.Do not adjust video hardwood rate in the process of recording, the strategy that voice data uses fixed rate to gather, gathering all voice datas is benchmark with the video data, when preserving every hardwood video data, extract the data of audio buffer simultaneously, audio, video data is carried out intermittently inserted hardwood.
5. carrying out when audio frequency and video record, recording when finishing when every hardwood video data, the voice data that this section recorded in the period forms a hardwood voice data simultaneously, and voice data and video data are inserted hardwood at interval, is saved at last in the AVI data file.
6. carrying out when audio frequency and video record, earlier data are put into buffering area, after buffering area has been expired, use the thread of a low priority data of buffering area to be write on the backstage, and use another buffering to continue the audio frequency and video recording process simultaneously, form the recycling of buffering.The same data division of the way to play for time of audio frequency and video index, and index calculates generation simultaneously when audio frequency and video are recorded.The position of index data indication should be to reserve AVI space, and calculate when and recording location after obtain.
7. when audio, video data recording is finished, need the Synchronous Processing buffered data, main thread is finished to record and block self, till background thread writes file with all buffered datas.
8. record finish after, merge AVI data file and AVI index file, and generate the AVI head, form final audio/video file.
9. the flash that use consider that as memory device the writing rate of flash device is relatively slow more in the handheld device, and the flash write operation is used circulation double buffering mechanism, reduce the consuming time of write operation, reach higher efficient.But method herein not only is applicable to nand flash, and is equally suitable to other storage medium.
10. the size of above-mentioned buffering area is decided by concrete handheld device, and in general minimum the wanting of buffering area can be preserved about 1 second audio, video data or index.The purpose that adopts buffering area is the number of times that reduces in order to try one's best the operation of storage medium, thereby improves the efficient of written document, if buffering area is too small, can't well achieve the goal, otherwise, if buffering area is excessive, also nonsensical to improving program efficiency, wasted memory headroom on the contrary.Concrete buffer size is selected, and decide according to system situation.As certain model mobile phone capable of taking pictures is the built-in nand flash of 60M memory space, and the system RAM memory size used of video recording is about 220K. and wherein cushions and be 2X100K in two blocks of data districts, and two blocks of index buffering areas are 2X10K.
Claims (3)
1. the kinescope method of a photographic hand-held equipment, photographic hand-held equipment comprises handheld device master chip, front end image processing chip, imageing sensor, flash memory and the RAM of system memory, it is characterized in that described kinescope method may further comprise the steps:
Record the identical audio, video data buffering area of 2 sizes of disposable application in the RAM of system memory before 101. carry out audio frequency and video, the first audio, video data buffering area is used for keeping in the audio frequency and video data recording, and the second audio, video data buffering area is used for writing the audio frequency and video data recording to the flash memory;
102. carrying out when audio frequency and video record, audio, video data is put into first audio, video data buffering area, when this buffering area is filled with, the first audio, video data buffering area is indicated with the exchange of the second audio, video data buffering area, first audio, video data buffering area behind the exchange sign continues to deposit in the audio, video data of recording, the data of the second audio, video data buffering area behind the exchange sign write the flash memory, form recycling of the RAM of system memory middle pitch video data buffer.
2. the kinescope method of a kind of photographic hand-held equipment according to claim 1 is characterized in that, and is further comprising the steps of:
Set up 2 files 201. carry out audio frequency and video before recording in the flash memory, one is AVI audio, video data file, and another is an AVI data directory file;
202. in step 101, apply in the audio frequency and video data recording buffering area, apply for that 2 sizes are identical, and than the little index data buffering area of audio, video data buffering area, be used for keeping in the audio frequency and video index data, the first index data buffering area is used for keeping in index data, and the second index data buffering area is used for writing index data to the flash memory;
203. when every hardwood video data acquiring was finished, the voice data that this section recorded in the period formed a hardwood voice data simultaneously, and voice data and video data are inserted hardwood at interval, was temporarily stored in first audio, video data buffering area;
204. calculate and generate the audio frequency and video index data according to every hardwood audio, video data size;
205. index data is put into first index data buffering area, when this buffering area is filled with, the first index data buffering area is indicated with the exchange of the second index data buffering area, first index data buffering area behind the exchange sign continues to deposit in the index data of recording, the data of the second index data buffering area behind the exchange sign write the flash memory, and the index data buffering area recycles in the formation RAM of the system memory;
206. when the data of the second audio, video data buffering area behind step 102 exchange sign write the flash memory, the audio, video data in the buffering area was saved in the AVI audio, video data file of flash memory;
207. when the data of the second index data buffering area behind step 205 exchange sign write the flash memory, the index data in the buffering area was saved in the AVI data directory file of flash memory;
208.203 the step cycle to 207 is carried out, video data is pressed the collection of timer interrupt timing, adopts constant video hardwood rate, and voice data uses the fixed rate collection;
209. record finish after, merge AVI audio, video data file and AVI data directory file, and generate the AVI head, form final AVI audio/video file.
3. the kinescope method of a kind of photographic hand-held equipment according to claim 2, it is characterized in that, when audio, video data recording is finished, carry out step 206 before, the Synchronous Processing buffered data is till writing all buffered datas AVI audio, video data file and AVI data directory file.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102117328A (en) * | 2011-03-03 | 2011-07-06 | 重庆国虹科技发展有限公司 | Recording data rapid storage method in Android system |
| CN103647937A (en) * | 2013-11-21 | 2014-03-19 | 北京环境特性研究所 | An image tracking system and an image data processing method thereof |
| CN103813121A (en) * | 2014-02-18 | 2014-05-21 | 厦门美图之家科技有限公司 | Method and apparatus for recording video |
| CN101645967B (en) * | 2009-05-14 | 2015-03-04 | 上海闻泰电子科技有限公司 | Mobile terminal for processing multimedia data in user-defined format and realization method thereof |
| CN105872425A (en) * | 2016-04-29 | 2016-08-17 | 乐视控股（北京）有限公司 | Storing method and device for video file |
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| CN108053821A (en) * | 2017-12-12 | 2018-05-18 | 腾讯科技（深圳）有限公司 | The method and apparatus for generating voice data |
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| US4843466A (en) * | 1988-04-27 | 1989-06-27 | Universal Video Communications Corp. | Method and system for decompressing color video slope encoded data |
| CN100349442C (en) * | 2004-05-28 | 2007-11-14 | 中兴通讯股份有限公司 | Ping pong buffer device |
| CN100481125C (en) * | 2005-08-26 | 2009-04-22 | 北京中星微电子有限公司 | Apparatus and method for pre-storage processing before image data compression |
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| CN102117328A (en) * | 2011-03-03 | 2011-07-06 | 重庆国虹科技发展有限公司 | Recording data rapid storage method in Android system |
| CN102117328B (en) * | 2011-03-03 | 2013-08-14 | 重庆国虹科技发展有限公司 | Recording data rapid storage method in Android system |
| CN103647937A (en) * | 2013-11-21 | 2014-03-19 | 北京环境特性研究所 | An image tracking system and an image data processing method thereof |
| CN103813121A (en) * | 2014-02-18 | 2014-05-21 | 厦门美图之家科技有限公司 | Method and apparatus for recording video |
| CN105872425A (en) * | 2016-04-29 | 2016-08-17 | 乐视控股（北京）有限公司 | Storing method and device for video file |
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| CN107040832A (en) * | 2017-04-22 | 2017-08-11 | 广州市比丽普电子有限公司 | A kind of handheld terminal formula microphone system based on Bluetooth technology |
| CN107465875A (en) * | 2017-09-13 | 2017-12-12 | 北京元心科技有限公司 | Camera preview data cache method and device |
| CN108053821A (en) * | 2017-12-12 | 2018-05-18 | 腾讯科技（深圳）有限公司 | The method and apparatus for generating voice data |
| US10747659B2 (en) | 2018-02-06 | 2020-08-18 | Western Digital Technologies, Inc. | Flash fast program mode for high definition video recording and high resolution camera burst mode recording |
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