CN105049881A - Method and system for fast forward and fast backward play based on streaming media server - Google Patents
Method and system for fast forward and fast backward play based on streaming media server Download PDFInfo
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- CN105049881A CN105049881A CN201410722841.3A CN201410722841A CN105049881A CN 105049881 A CN105049881 A CN 105049881A CN 201410722841 A CN201410722841 A CN 201410722841A CN 105049881 A CN105049881 A CN 105049881A
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Abstract
The invention discloses a method and system for fast forward and fast backward play based on a streaming media server, and relates to the field of streaming media systems. The method includes the following steps of, based on the information of an IDR keyframe of a media file, establishing frame index information; extracting the IDR keyframe of the media file and constituting a speed multiplication file; when a user needs to play media content at a normal speed, playing the media file in accordance with the code rate of the media file; when the user needs to play the media content at a fast forward speed, playing the speed multiplication file in a front to back order; when the user needs to play the media content at a fast backward speed, playing the speed multiplication file in a back to front order. The method and system herein occupy small storage space, and can implement fast forward and fast backward play with a small amount of extra storage overhead and disk bandwidth. The method and system not only is efficient in reading the speed multiplication file and easy to use, but also does not influence user experience, and thus satisfies user needs.
Description
Technical field
The present invention relates to stream media system field, be specifically related to a kind of method and system realizing fast forwarding and fast rewinding broadcasting based on streaming media server.
Background technology
A kind of brand-new technology that the multiple interactive services comprising Digital Television is provided to user of IPTV (IPTV).Along with the development of society, the userbase of IPTV increases gradually, and the media content of IPTV is more and more abundanter, and IPTV is with the speed increment of the about order of magnitude that rises every year.Support that in order to make IPTV fast forwarding and fast rewinding is play, the media content of injection can generate and store the speed file (2x, 4x, 8x, 16x, 32x, 64x speed file of such as F.F. ,-the 2x ,-4x of rewind ,-8x ,-16x ,-32x ,-64x speed file) of various speed (x) by IPTV server.The impact of file on disk I/O (input/output interface) of different speed is identical, when user asks the media content playing required speed, plays the media file of corresponding speed.
Store the media file that needs to support F.F. and rewind, need the storage area (F.F. file and rewind file) taking 2 times.In order to save the storage area of IPTV server, IPTV takes out frame and plays media file from media content, realizes with this result of broadcast being issued to fast forwarding and fast rewinding in the situation not generating speed file.
When taking out frame broadcasting media file according to disk order from media content, because the media content read only has small part to be IDR (IntermediateDataRate, middle data rate) key frame, so the speed of playback of media files is higher, when disk reads, data waste is larger, and the IO bandwidth taking disk is also higher; And then making CACHE (cache memory) hit rate lower (server finds the probability of useful data at CACHE), the reading efficiency of system is lower, is not easy to people and uses.
Meanwhile, from media content, take out frame according to disk order play media file, realize fast forwarding and fast rewinding, not only can waste disk I/O in a large number, and the concurrent stream of a small amount of fast forwarding and fast rewinding can only be supported.If take out frame not in accordance with disk order to play media file, according to frame, byte offset place in media file starts the data reading frame sign, the operating process on software simulating relatively more multiple (often reading frame has disk I/O request once at least).The IOPS (Input/OutputOperationsPerSecond, the i.e. number of times carrying out read-write operation per second) of disk is difficult to the demand meeting user.
Summary of the invention
For the defect existed in prior art, the object of the present invention is to provide a kind of method and system realizing fast forwarding and fast rewinding broadcasting based on streaming media server.The storage area that the present invention takies is less, with a small amount of extra storage expense and Disk bandwidth, can realize the result of broadcast of fast forwarding and fast rewinding, the efficiency not only reading speed file is higher, use more convenient, and can not Consumer's Experience be affected, the demand of user can be met.
For reaching above object, the method realizing fast forwarding and fast rewinding broadcasting based on streaming media server provided by the invention, comprises the following steps:
A, to inject before streaming media server at media file, media file is resolved, obtains the information of all middle data rate IDR key frames in media file; The information of IDR key frame comprises IDR key frame size, IDR key frame relative to the byte offset of media file beginning, and the information according to all IDR key frames sets up frame index information;
B, foundation order according to IDR key frame in frame index information, travel through all IDR key frames, from the 0th s, at interval of 2 IDR key frames, extract 1 IDR key frame, by all IDR key frames of extraction formation speed files; The byte offset of each IDR key frame in record speed multiplay file in frame index information; Media file and speed file are injected into streaming media server, frame index information is saved to database;
C, when user need according to normal speed forward media content time, according to media file code check play media file;
When user needs the speed playing media content to be converted to fast forward speed by normal speed, search in frame index information and locate the byte place IDR key frame play; Using the IDR key frame of first in speed file after current I DR key frame as broadcasting frame, in frame index information, search the byte offset of current broadcasting frame; According to order from front to back, read from the byte offset of current broadcasting frame and play speed file;
When user needs the speed playing media content to be converted to rewind speeds by normal speed, search in frame index information and locate the byte place IDR key frame play; Using the IDR key frame of first in speed file before current I DR key frame as broadcasting frame, in frame index information, search the byte offset of current broadcasting frame; According to order from back to front, read from the byte offset of current broadcasting frame and play speed file.
On the basis of technique scheme, step C is further comprising the steps of: when user needs the speed of the media content of broadcasting to be converted to rewind speeds by fast forward speed, using first IDR key frame before the IDR key frame play in speed file as playing frame, according to order from front to back, read from current broadcasting frame and play the IDR key frame speed file.
On the basis of technique scheme, step C is further comprising the steps of: when user needs the speed of the media content of broadcasting to be converted to fast forward speed by rewind speeds, using first IDR key frame after the IDR key frame play in speed file as playing frame, according to order from front to back, read from current broadcasting frame and play the IDR key frame speed file.
On the basis of technique scheme, step C is further comprising the steps of: when user needs the speed of the media content of broadcasting be converted to normal speed by fast forward speed or be converted to normal speed by rewind speeds, in speed file, search the IDR key frame at the byte place of playing, search in frame index information and locate the byte offset of current I DR key frame relative to media file beginning; According to order from front to back, read from current byte skew and play media file.
On the basis of technique scheme, when user needs to play media content according to the speed of F.F. 32 times, after broadcasting frame in speed file, at interval of 1 IDR key frame, extract 1 IDR key frame as broadcasting frame, according to order from front to back, read and play frame, broadcasting speed is 3 frames per second;
When user needs to play media content according to the speed of rewind 32 times, before broadcasting frame in speed file, at interval of 1 IDR Key Frame Extraction, 1 IDR key frame as broadcasting frame, according to order from back to front, read and play frame, broadcasting speed is 3 frames per second.
On the basis of technique scheme, when user needs to play media content according to the speed of F.F. 16 times, after broadcasting frame in speed file, at interval of 2 IDR Key Frame Extractions, 1 IDR key frame as broadcasting frame, according to order from front to back, read and play frame, broadcasting speed is 3 frames per second;
When user needs to play media content according to the speed of rewind 16 times, after broadcasting frame in speed file, at interval of 2 IDR Key Frame Extractions, 1 IDR key frame as broadcasting frame, according to order from back to front, read and play frame, broadcasting speed is 3 frames per second.
On the basis of technique scheme, when user needs to play media content according to the speed of F.F. 8 times or rewind 8 times, broadcasting speed is 3 frames per second, and broadcasting code check is 786432bps.
On the basis of technique scheme, when user needs to play media content according to the speed of F.F. 4 times or rewind 4 times, broadcasting speed is 3 frames per second, and broadcasting code check is 393216bps.
On the basis of technique scheme, when user needs to play media content according to the speed of F.F. 2 times or rewind 2 times, broadcasting speed is 3 frames per second, and broadcasting code check is 196608bps.
Realize the system realizing fast forwarding and fast rewinding broadcasting based on streaming media server of said method, comprise frame index information and set up module, speed file creation module and file playing module;
Described index information set up module for: inject before streaming media server at media file, media file resolved, obtains the information of all middle data rate IDR key frames in media file; The information of IDR key frame comprises IDR key frame size, IDR key frame relative to the byte offset of media file beginning, and the information according to all IDR key frames sets up frame index information; Speed document creation signal is sent to speed file creation module;
Described speed file creation module is used for: after receiving speed document creation signal, according to the foundation order of IDR key frame in frame index information, travel through all IDR key frames, from the 0th, at interval of 2 IDR key frames, extract 1 IDR key frame, all IDR key frames extracted are formed speed file; The byte offset of each IDR key frame in record speed multiplay file in frame index information; Media file and speed file are injected into streaming media server, frame index information is saved to database; File play signal is sent to file playing module;
Described file playing module is used for: after receiving file play signal, when user needs according to normal speed forward media content, plays media file according to the code check of media file;
When user needs the speed playing media content to be converted to fast forward speed by normal speed, search in frame index information and locate the byte place IDR key frame play; Using the IDR key frame of first in speed file after current I DR key frame as broadcasting frame, in frame index information, search the byte offset of current broadcasting frame; According to order from front to back, read from the byte offset of current broadcasting frame and play speed file;
When user needs the speed playing media content to be converted to rewind speeds by normal speed, search in frame index information and locate the byte place IDR key frame play; Using the IDR key frame of first in speed file before current I DR key frame as broadcasting frame, in frame index information, search the byte offset of current broadcasting frame; According to order from back to front, read from the byte offset of current broadcasting frame and play speed file.
Compared with prior art, the invention has the advantages that:
(1) the present invention can by the IDR key frame write speed file in media file, all speed result of broadcast (fast forwarding and fast rewinding 32 times, 16 times, 8 times, 4 times and 2 times) is realized according to 1 speed file, realize compared with speed plays with prior art by multiple speed file, speed file of the present invention only has 1, and the storage area taken is less.
(2) the present invention is by the IDR key frame in media file from the 0th, at interval of 2 IDR key frames, extracts in 1 IDR key frame write speed file; The capacity of speed file is less (only having at most 1/8 of media file), and the storage overhead of speed file is lower.Therefore, the present invention with a small amount of extra storage expense and Disk bandwidth, can realize the result of broadcast of fast forwarding and fast rewinding, can not affect Consumer's Experience, is convenient to people and uses.
(3) when the present invention plays media content according to high speed (F.F. or rewind 16 times, F.F. or rewind 32 times), at interval of 2 or 3 IDR key frames in speed file, 1 IDR key frame is extracted as broadcasting frame.With in prior art at great majority be non-IDR key frame media file in extract compared with IDR key frame, speed file of the present invention is only containing IDR key frame, and the reading efficiency of speed file is higher, uses more convenient, quick.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
The method realizing fast forwarding and fast rewinding broadcasting based on streaming media server in the embodiment of the present invention, comprises the following steps:
S1: before media file injects streaming media server, media file is resolved, obtains the information of all IDR in media file (IntermediateDataRate, middle data rate) key frame; The information of IDR key frame comprises IDR key frame size, IDR key frame relative to the byte offset of media file beginning, and the information according to all IDR key frames sets up frame index information.
S2: according to the foundation order of IDR key frame in frame index information, travel through all IDR key frames, from the 0th, at interval of 2 IDR key frames, extract 1 IDR key frame, all IDR key frames extracted are formed speed file; The byte offset of each IDR key frame in record speed multiplay file in frame index information.
S3: media file and speed file are injected into streaming media server, frame index information is saved to database.
S4: when user needs according to normal speed forward media content, plays media file according to the code check of media file.
S5: when user needs the speed playing media content to be converted to fast forward speed by normal speed, search in frame index information and locate the byte place IDR key frame play.Using the IDR key frame of first in speed file after current I DR key frame as broadcasting frame, in frame index information, search the byte offset of current broadcasting frame; According to order from front to back, read from the byte offset of current broadcasting frame and play speed file.
S6: when user needs the speed playing media content to be converted to rewind speeds by normal speed, search in frame index information and locate the byte place IDR key frame play.Using the IDR key frame of first in speed file before current I DR key frame as broadcasting frame, in frame index information, search the byte offset of current broadcasting frame; According to order from back to front, read from the byte offset of current broadcasting frame and play speed file.
S7: when user needs the speed of the media content of broadcasting to be converted to rewind speeds by fast forward speed, using first IDR key frame before the IDR key frame play in speed file as playing frame, according to order from front to back, read from current broadcasting frame and play the IDR key frame speed file.
S8: when user needs the speed of the media content of broadcasting to be converted to fast forward speed by rewind speeds, using first IDR key frame after the IDR key frame play in speed file as playing frame, according to order from front to back, read from current broadcasting frame and play the IDR key frame speed file.
S9: when user needs the speed of the media content of broadcasting be converted to normal speed by fast forward speed or be converted to normal speed by rewind speeds, in speed file, search the IDR key frame at the byte place of playing, search in frame index information and locate the byte offset of current I DR key frame relative to media file beginning; According to order from front to back, read from current byte skew and play media file.
In step S5 ~ S8, when user needs to play media content according to the speed of F.F. 32 times, after broadcasting frame in speed file, at interval of 1 IDR key frame, extract 1 IDR key frame as broadcasting frame, according to order from front to back, read and play frame, broadcasting speed is 3 frames per second.
When user needs to play media content according to the speed of rewind 32 times, before broadcasting frame in speed file, at interval of 1 IDR Key Frame Extraction, 1 IDR key frame as broadcasting frame, according to order from back to front, read and play frame, broadcasting speed is 3 frames per second.
When user needs to play media content according to the speed of F.F. 16 times, after broadcasting frame in speed file, at interval of 2 IDR Key Frame Extractions, 1 IDR key frame as broadcasting frame, according to order from front to back, read and play frame, broadcasting speed is 3 frames per second.
When user needs to play media content according to the speed of rewind 16 times, after broadcasting frame in speed file, at interval of 2 IDR Key Frame Extractions, 1 IDR key frame as broadcasting frame, according to order from back to front, read and play frame, broadcasting speed is 3 frames per second.
When user needs to play media content according to the speed of F.F. 8 times or rewind 8 times, broadcasting speed is 3 frames per second, and broadcasting code check is 786432bps.
When user needs to play media content according to the speed of F.F. 4 times or rewind 4 times, broadcasting speed is 3 frames per second, and broadcasting code check is 393216bps.
When user needs to play media content according to the speed of F.F. 2 times or rewind 2 times, broadcasting speed is 3 frames per second, and broadcasting code check is 196608bps.
The system realizing fast forwarding and fast rewinding broadcasting based on streaming media server realizing said method in the embodiment of the present invention, comprises frame index information and sets up module, speed file creation module and file playing module.
Index information set up module for: inject before streaming media server at media file, media file resolved, obtains the information of all middle data rate IDR key frames in media file; The information of IDR key frame comprises IDR key frame size, IDR key frame relative to the byte offset of media file beginning, and the information according to all IDR key frames sets up frame index information; Speed document creation signal is sent to speed file creation module.
Speed file creation module is used for: after receiving speed document creation signal, according to the foundation order of IDR key frame in frame index information, travel through all IDR key frames, from the 0th, at interval of 2 IDR key frames, extract 1 IDR key frame, all IDR key frames extracted are formed speed file; The byte offset of each IDR key frame in record speed multiplay file in frame index information; Media file and speed file are injected into streaming media server, frame index information is saved to database; File play signal is sent to file playing module.
File playing module is used for: after receiving file play signal, when user needs according to normal speed forward media content, plays media file according to the code check of media file.
When user needs the speed playing media content to be converted to fast forward speed by normal speed, search in frame index information and locate the byte place IDR key frame play; Using the IDR key frame of first in speed file after current I DR key frame as broadcasting frame, in frame index information, search the byte offset of current broadcasting frame; According to order from front to back, read from the byte offset of current broadcasting frame and play speed file.
When user needs the speed playing media content to be converted to rewind speeds by normal speed, search in frame index information and locate the byte place IDR key frame play; Using the IDR key frame of first in speed file before current I DR key frame as broadcasting frame, in frame index information, search the byte offset of current broadcasting frame; According to order from back to front, read from the byte offset of current broadcasting frame and play speed file.
The present invention is not limited to above-mentioned execution mode, and for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications are also considered as within protection scope of the present invention.The content be not described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (10)
1. realize a method for fast forwarding and fast rewinding broadcasting based on streaming media server, it is characterized in that, comprise the following steps:
A, to inject before streaming media server at media file, media file is resolved, obtains the information of all middle data rate IDR key frames in media file; The information of IDR key frame comprises IDR key frame size, IDR key frame relative to the byte offset of media file beginning, and the information according to all IDR key frames sets up frame index information;
B, foundation order according to IDR key frame in frame index information, travel through all IDR key frames, from the 0th s, at interval of 2 IDR key frames, extract 1 IDR key frame, by all IDR key frames of extraction formation speed files; The byte offset of each IDR key frame in record speed multiplay file in frame index information; Media file and speed file are injected into streaming media server, frame index information is saved to database;
C, when user need according to normal speed forward media content time, according to media file code check play media file;
When user needs the speed playing media content to be converted to fast forward speed by normal speed, search in frame index information and locate the byte place IDR key frame play; Using the IDR key frame of first in speed file after current I DR key frame as broadcasting frame, in frame index information, search the byte offset of current broadcasting frame; According to order from front to back, read from the byte offset of current broadcasting frame and play speed file;
When user needs the speed playing media content to be converted to rewind speeds by normal speed, search in frame index information and locate the byte place IDR key frame play; Using the IDR key frame of first in speed file before current I DR key frame as broadcasting frame, in frame index information, search the byte offset of current broadcasting frame; According to order from back to front, read from the byte offset of current broadcasting frame and play speed file.
2. the method for fast forwarding and fast rewinding broadcasting is realized as claimed in claim 1 based on streaming media server, it is characterized in that, step C is further comprising the steps of: when user needs the speed of the media content of broadcasting to be converted to rewind speeds by fast forward speed, using first IDR key frame before the IDR key frame play in speed file as playing frame, according to order from front to back, read from current broadcasting frame and play the IDR key frame speed file.
3. the method for fast forwarding and fast rewinding broadcasting is realized as claimed in claim 1 based on streaming media server, it is characterized in that, step C is further comprising the steps of: when user needs the speed of the media content of broadcasting to be converted to fast forward speed by rewind speeds, using first IDR key frame after the IDR key frame play in speed file as playing frame, according to order from front to back, read from current broadcasting frame and play the IDR key frame speed file.
4. the method for fast forwarding and fast rewinding broadcasting is realized as claimed in claim 1 based on streaming media server, it is characterized in that, step C is further comprising the steps of: when user needs the speed of the media content of broadcasting be converted to normal speed by fast forward speed or be converted to normal speed by rewind speeds, in speed file, search the IDR key frame at the byte place of playing, search in frame index information and locate the byte offset of current I DR key frame relative to media file beginning; According to order from front to back, read from current byte skew and play media file.
5. the method realizing fast forwarding and fast rewinding broadcasting based on streaming media server as described in any one of Claims 1-4, it is characterized in that: when user's needs play media content according to the speed of F.F. 32 times, after broadcasting frame in speed file, at interval of 1 IDR key frame, extract 1 IDR key frame as broadcasting frame, according to order from front to back, read and play frame, broadcasting speed is 3 frames per second;
When user needs to play media content according to the speed of rewind 32 times, before broadcasting frame in speed file, at interval of 1 IDR Key Frame Extraction, 1 IDR key frame as broadcasting frame, according to order from back to front, read and play frame, broadcasting speed is 3 frames per second.
6. the method realizing fast forwarding and fast rewinding broadcasting based on streaming media server as described in any one of Claims 1-4, it is characterized in that: when user's needs play media content according to the speed of F.F. 16 times, after broadcasting frame in speed file, at interval of 2 IDR Key Frame Extractions, 1 IDR key frame as broadcasting frame, according to order from front to back, read and play frame, broadcasting speed is 3 frames per second;
When user needs to play media content according to the speed of rewind 16 times, after broadcasting frame in speed file, at interval of 2 IDR Key Frame Extractions, 1 IDR key frame as broadcasting frame, according to order from back to front, read and play frame, broadcasting speed is 3 frames per second.
7. the method realizing fast forwarding and fast rewinding broadcasting based on streaming media server as described in any one of Claims 1-4, it is characterized in that: when user's needs play media content according to the speed of F.F. 8 times or rewind 8 times, broadcasting speed is 3 frames per second, and broadcasting code check is 786432bps.
8. the method realizing fast forwarding and fast rewinding broadcasting based on streaming media server as described in any one of Claims 1-4, it is characterized in that: when user's needs play media content according to the speed of F.F. 4 times or rewind 4 times, broadcasting speed is 3 frames per second, and broadcasting code check is 393216bps.
9. the method realizing fast forwarding and fast rewinding broadcasting based on streaming media server as described in any one of Claims 1-4, it is characterized in that: when user's needs play media content according to the speed of F.F. 2 times or rewind 2 times, broadcasting speed is 3 frames per second, and broadcasting code check is 196608bps.
10. realize the system realizing fast forwarding and fast rewinding broadcasting based on streaming media server of method described in any one of claim 1 to 9, it is characterized in that: comprise frame index information and set up module, speed file creation module and file playing module;
Described index information set up module for: inject before streaming media server at media file, media file resolved, obtains the information of all middle data rate IDR key frames in media file; The information of IDR key frame comprises IDR key frame size, IDR key frame relative to the byte offset of media file beginning, and the information according to all IDR key frames sets up frame index information; Speed document creation signal is sent to speed file creation module;
Described speed file creation module is used for: after receiving speed document creation signal, according to the foundation order of IDR key frame in frame index information, travel through all IDR key frames, from the 0th, at interval of 2 IDR key frames, extract 1 IDR key frame, all IDR key frames extracted are formed speed file; The byte offset of each IDR key frame in record speed multiplay file in frame index information; Media file and speed file are injected into streaming media server, frame index information is saved to database; File play signal is sent to file playing module;
Described file playing module is used for: after receiving file play signal, when user needs according to normal speed forward media content, plays media file according to the code check of media file;
When user needs the speed playing media content to be converted to fast forward speed by normal speed, search in frame index information and locate the byte place IDR key frame play; Using the IDR key frame of first in speed file after current I DR key frame as broadcasting frame, in frame index information, search the byte offset of current broadcasting frame; According to order from front to back, read from the byte offset of current broadcasting frame and play speed file;
When user needs the speed playing media content to be converted to rewind speeds by normal speed, search in frame index information and locate the byte place IDR key frame play; Using the IDR key frame of first in speed file before current I DR key frame as broadcasting frame, in frame index information, search the byte offset of current broadcasting frame; According to order from back to front, read from the byte offset of current broadcasting frame and play speed file.
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