CN102264004A - Method and device for preventing deficiency of key frame from causing seek incapability - Google Patents
Method and device for preventing deficiency of key frame from causing seek incapability Download PDFInfo
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- CN102264004A CN102264004A CN2011102239808A CN201110223980A CN102264004A CN 102264004 A CN102264004 A CN 102264004A CN 2011102239808 A CN2011102239808 A CN 2011102239808A CN 201110223980 A CN201110223980 A CN 201110223980A CN 102264004 A CN102264004 A CN 102264004A
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Abstract
The invention discloses a method and a device for preventing the deficiency of a key frame from causing seek incapability. The method comprises the following steps of: when a seek operation is performed on the frame data of a media audio and video file, acquiring a previous key frame of a sought time point according to the sought time point; starting reading a file stream from the position of the previous key frame, and transmitting the read file stream to a decoder for decoding; judging whether a time point of the decoded frame data reaches the sought time point or not, and if the time point of the decoded frame data is judged to be before the sought time point, discarding the frame data; and if the time point of the decoded frame data is judged to reach the sought time point, playing and displaying the decoded data. Therefore, the problem that a certain time point cannot be accurately sought and positioned when a certain audio and video file is played can be solved.
Description
Technical field
The present invention relates to the media file process field, in particular a kind of method and device that prevents key frame disappearance and can not seek.
Background technology
At present there are media files such as a lot of AVI, MKV the market, is doing the seek(redirect) in the operation, all be according to the key frame location, according to the incidental file location information of key frame, carry out the seek location.Because in the time of coding, (key frame is equivalent to the original painting in the 2 D animation to the audio-video document key frame that has, refer to residing that frame of key operations in role or object of which movement or the variation) fewer, cause when doing the seek operation, can not be well carry out seek according to one second one second step (stepping), but middle floating of similar several seconds even tens seconds arranged, can not accurate in locating in the time of seek want to determine the video pictures seen to the user.
Reason according to key frame position location data is: in MPEG(Moving Pictures Experts Group/Motin Pictures Experts Group, dynamic image expert group) coding process in, the partial video frame sequence is collapsed into the I frame; Part is compressed into the P frame; Also have part to be compressed into the B frame.Wherein, the I frame is to come the in-frame encoding picture of compressed transmission data amount by removing the image space redundant information as far as possible, and the reference point as random access is key frame; The P frame is to come the coded image of compressed transmission data amount by front in the abundant reduction image sequence time redundancy information of coded frame, by in the P of its front frame or the prediction of I frame, also is predictive frame; The B frame be both considered and the sequence of source images front coded frame, also take into account the sequence of source images back the time redundancy information between the coded frame come the coded image of compressed transmission data amount, also be bi-directional predicted frames.
In the time of the decoder decode data key frame must be arranged, if there is not key frame, have only P, B frame, decoder can not decode data.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
The technical problem to be solved in the present invention is, at the above-mentioned defective of prior art, provides a kind of method and device that prevents the key frame disappearance and can not seek, and it solves some audio-video document when playing, and accurately seek navigates to problem sometime.
The technical scheme that technical solution problem of the present invention is adopted is as follows:
A kind of method that prevents key frame disappearance and can not seek wherein, comprising:
A, when the frame data of medium audio-video document are carried out the seek operation, according to seek to time point obtain the preceding key frame of this seek time point;
B, begin to read document flow, and send the document flow that this reads to decoder decode from the position of this preceding key frame;
C, judge whether the time point of decoded frame data arrives the time point of seek, before the time point of the time point of judging decoded frame data, then these frame data are abandoned at seek;
D, when the time point of judging decoded frame data arrives the time point of seek, then decoded data are play demonstration.
The described method that prevents key frame disappearance and can not seek, wherein, described step B specifically comprises:
B1, according to the preceding key frame that gets access to, obtain the positional information of this preceding key frame;
B2, according to should before the positional information of key frame, read the document flow that position from then on begins, and send the document flow that this reads to decoder decode.
The described method that prevents key frame disappearance and can not seek, described step C also comprises: carry out data sync by synchronizing thread, before the time point of the time point of judging decoded frame data at seek, then by synchronizing thread these frame data are abandoned.
The described method that prevents key frame disappearance and can not seek, described key frame be for influence the frame data of picture image parameter, described before key frame be that position on time shaft is positioned at before the seek time point and near the key frame of seek time point.
The described method that prevents key frame disappearance and can not seek is characterized in that described audio-video document is avi file or MKV file.
The described method that prevents key frame disappearance and can not seek, wherein, described step C also comprises: carry out data sync by synchronizing thread, before the time point of the time point of judging decoded frame data at seek, then by synchronizing thread these frame data are abandoned.
The described method that prevents key frame disappearance and can not seek, wherein, described key frame is for influencing the frame data of picture image parameter; Key frame is positioned at before the seek time point for position on time shaft and near the key frame of seek time point before described.
A kind of device that prevents key frame disappearance and can not seek wherein, comprising:
Before the key frame acquisition module, when being used for frame data to the medium audio-video document and carrying out the seek operation, according to seek to time point obtain the preceding key frame of this seek time point;
Read and delivery module, be used for beginning to read document flow, and send the document flow that this reads to decoder decode from the position of this preceding key frame;
Judge module is used to judge whether the time point of decoded frame data arrives the time point of seek, before the time point of the time point of judging decoded frame data at seek, then these frame data is abandoned;
Playing module is used for the time point as the time point arrival seek that judges decoded frame data, then decoded data is play demonstration.
The described device that prevents key frame disappearance and can not seek, wherein, described reading with delivery module comprises:
The positional information extraction unit is used for obtaining the positional information of this preceding key frame according to the preceding key frame that gets access to;
Reading unit, be used for according to should before the positional information of key frame, read the document flow that position from then on begins;
Delivery unit is used for sending this document flow that reads to decoder decode.
The described device that prevents key frame disappearance and can not seek, described judge module comprises:
Lock unit is used for carrying out data sync by synchronizing thread, before the time point of the time point of judging decoded frame data at seek, then by synchronizing thread these frame data is abandoned.
The described device that prevents key frame disappearance and can not seek, described key frame is for influencing the frame data of picture image parameter; Before key frame be positioned at before the seek time point for position on time shaft and near the key frame of seek time point.
The described device that prevents key frame disappearance and can not seek, described audio-video document is avi file or MKV file.
Method and the device that prevents key frame disappearance and can not seek provided by the present invention, owing to adopted file according to seek position, key frame location, at first according to the time point of wanting seek to arrive, navigate to preceding key frame near this time point, obtain the document location at this key frame place, play according to this positional information.Because the positional information of this moment is not the positional information of actual that time point that will play, so after the data with the beginning of this positional information send decoder decode to, decoded data are not shown at once, but carry out data sync by synchronizing thread, carry out synchronously according to the time point of wanting seek, if these frame data are before wanting the time point of seek, directly decoded data are abandoned, up to these frame data are time points of wanting the seek location, this moment decoded data are shown, can navigate to the audio frequency and video time point that to play at seek accurately; It can accurate in locating arrive the video pictures of user's redirect in the seek operation.
Description of drawings
Fig. 1 is that the present invention prevents key frame disappearance and the flow chart of a kind of embodiment of method that can not seek.
Fig. 2 is that the present invention prevents key frame disappearance and the theory diagram of a kind of embodiment of device that can not seek.
Fig. 3 is that the present invention prevents key frame disappearance and reading and the inner theory diagram of delivery module in can not the device of seek.
Embodiment
A kind of method and device that prevents key frame disappearance and can not seek provided by the present invention, clearer, clear and definite for making purpose of the present invention, technical scheme and advantage, below develop simultaneously with reference to accompanying drawing that the present invention is described in more detail for embodiment.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.
A kind of method that prevents the key frame disappearance and can not seek that the embodiment of the invention provides as shown in Figure 1, mainly may further comprise the steps:
Step S110, when the frame data of medium audio-video document are carried out the seek operation, according to seek to time point obtain the preceding key frame of this seek time point.This step is specially: carry out seek when operation at the frame data to the medium audio-video document, at first obtain the seek time point, obtain according to the seek time point and be positioned at before the seek time point and near the key frame of seek time point.During playing audio-video document, the user can operate (skip operation) broadcast point is jumped to the optional position that the user likes by seek.Wherein, key frame is for influence the frame data of picture image parameter, and preceding key frame is that the position on time shaft is positioned at before the seek time point and near the key frame of seek time point.Audio-video document such as AVI(Audio Video Interleaved, the Audio Video Interleaved form) file or MKV file, MKV is not a kind of compressed format, but a kind of media file of Matroska, Matroska is a kind of new multimedia encapsulation format, also claims multimedia container (Multimedia Container).
Step S120, begin to read document flow, and send the document flow that this reads to decoder decode from the position of this preceding key frame.
This step is specially: according to the preceding key frame that gets access to, obtain the positional information of this preceding key frame; According to the positional information of this preceding key frame, read the document flow that position from then on begins, and send the document flow that this reads to decoder, decoder carries out continuous decoding to the document flow that reads.Enter step S130 then.
Step S130, judge whether the time point of decoded frame data arrives the time point of seek, before the time point of the time point of judging decoded frame data, then these frame data are abandoned at seek;
For example, carry out data sync, before the time point of the time point of judging decoded frame data, then these frame data are abandoned by synchronizing thread at seek by synchronizing thread.
The document location at preceding key frame place by obtaining the seek time point in the present embodiment, because the positional information of the seek time point that the positional information of preceding key frame is not an actual needs to be play, so after in the past the document flow that begins of key frame positional information sends decoder to and decodes, decoded data are not shown at once, but carry out data sync by synchronizing thread, carry out synchronously according to the time point of wanting seek, if these frame data before the seek time point, directly abandon decoded data.Continue then to decode, enter step S140 up to the time point arrival seek of the frame data of decoding time point.
Step S140, when the time point of judging decoded frame data arrives the time point of seek, then decoded data are play demonstration.Are time points of wanting the seek location up to decoded frame data promptly, normally play demonstration with decoded data this moment.
Therefore the embodiment of the invention a kind of prevents the key frame disappearance and method that can not seek, and it can accurately navigate to the audio frequency and video time point that will play by seek.
Based on the foregoing description, the embodiment of the invention also provides a kind of device that prevents key frame disappearance and can not seek, as shown in Figure 2, mainly comprises:
Before key frame acquisition module 210, when being used for frame data to the medium audio-video document and carrying out the seek operation, according to seek to time point obtain the preceding key frame of this seek time point; Specifically as described in the above-mentioned step S110.Wherein, described seek is operating as skip operation.
Read and delivery module 220, be used for beginning to read document flow, and send the document flow that this reads to decoder 250 decodings from the position of this preceding key frame; Specifically as described in the above-mentioned step S120.
Wherein, as shown in Figure 3, read with delivery module 220 and comprise:
Positional information extraction unit 221 is used for obtaining the positional information of this preceding key frame according to the preceding key frame that gets access to;
Wherein, described judge module 230 comprises: lock unit, be used for carrying out data sync by synchronizing thread, and before the time point of the time point of judging decoded frame data, then these frame data are abandoned by synchronizing thread at seek.
In sum, method and the device that prevents key frame disappearance and can not seek provided by the present invention, owing to adopted file according to seek position, key frame location, at first according to the time point of wanting seek to arrive, navigate to preceding key frame near this time point, obtain the document location at this key frame place, play according to this positional information.Because the positional information of this moment is not the positional information of actual that time point that will play, so after the data with the beginning of this positional information send decoder decode to, decoded data are not shown at once, but carry out data sync by synchronizing thread, carry out synchronously according to the time point of wanting seek, if these frame data are before wanting the time point of seek, directly decoded data are abandoned, up to these frame data are time points of wanting the seek location, this moment decoded data are shown, can navigate to the audio frequency and video time point that to play at seek accurately.
Should be understood that application of the present invention is not limited to above-mentioned giving an example, for those of ordinary skills, can be improved according to the above description or conversion that all these improvement and conversion all should belong to the protection range of claims of the present invention.
Claims (10)
1. a method that prevents key frame disappearance and can not seek is characterized in that, comprising:
A, when the frame data of medium audio-video document are carried out the seek operation, according to seek to time point obtain the preceding key frame of this seek time point;
B, begin to read document flow, and send the document flow that this reads to decoder decode from the position of this preceding key frame;
C, judge whether the time point of decoded frame data arrives the time point of seek, before the time point of the time point of judging decoded frame data, then these frame data are abandoned at seek;
D, when the time point of judging decoded frame data arrives the time point of seek, then decoded data are play demonstration.
2. according to the described method that prevents key frame disappearance and can not seek of claim 1, it is characterized in that described step B specifically comprises:
B1, according to the preceding key frame that gets access to, obtain the positional information of this preceding key frame;
B2, according to should before the positional information of key frame, read the document flow that position from then on begins, and send the document flow that this reads to decoder decode.
3. according to the described method that prevents key frame disappearance and can not seek of claim 1, it is characterized in that, described step C also comprises: carry out data sync by synchronizing thread, before the time point of the time point of judging decoded frame data, then these frame data are abandoned by synchronizing thread at seek.
4. according to the described method that prevents key frame disappearance and can not seek of claim 1, it is characterized in that, described key frame is for influence the frame data of picture image parameter, described before key frame be that position on time shaft is positioned at before the seek time point and near the key frame of seek time point.
5. according to the described method that prevents key frame disappearance and can not seek of claim 1, it is characterized in that described audio-video document is avi file or MKV file.
6. a device that prevents key frame disappearance and can not seek is characterized in that, comprising:
Before the key frame acquisition module, when being used for frame data to the medium audio-video document and carrying out the seek operation, according to seek to time point obtain the preceding key frame of this seek time point;
Read and delivery module, be used for beginning to read document flow, and send the document flow that this reads to decoder decode from the position of this preceding key frame;
Judge module is used to judge whether the time point of decoded frame data arrives the time point of seek, before the time point of the time point of judging decoded frame data at seek, then these frame data is abandoned;
Playing module is used for the time point as the time point arrival seek that judges decoded frame data, then decoded data is play demonstration.
7. according to the described device that prevents key frame disappearance and can not seek of claim 6, it is characterized in that described reading with delivery module comprises:
The positional information extraction unit is used for obtaining the positional information of this preceding key frame according to the preceding key frame that gets access to;
Reading unit, be used for according to should before the positional information of key frame, read the document flow that position from then on begins;
Delivery unit is used for sending this document flow that reads to decoder decode.
8. according to the described device that prevents key frame disappearance and can not seek of claim 6, it is characterized in that described judge module comprises:
Lock unit is used for carrying out data sync by synchronizing thread, before the time point of the time point of judging decoded frame data at seek, then by synchronizing thread these frame data is abandoned.
9. according to the described device that prevents key frame disappearance and can not seek of claim 6, it is characterized in that described key frame is for influencing the frame data of picture image parameter; Key frame is positioned at before the seek time point for position on time shaft and near the key frame of seek time point before described.
10. according to the described method that prevents key frame disappearance and can not seek of claim 6, it is characterized in that described audio-video document is avi file or MKV file.
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