CN102355605A - Live time-shift processing method of IPTV (Internet Protocol Television) set-top box - Google Patents
Live time-shift processing method of IPTV (Internet Protocol Television) set-top box Download PDFInfo
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Abstract
The invention discloses a live time-shift processing method of an IPTV (Internet Protocol Television) set-top box. The method comprises the following steps: under a live time-shift mode, a playing terminal of the IPTV set-top box interacts with a time-shift server through a real time streaming protocol (RTSP) so as to obtain the live time-shift playing time range, and then the playing terminal calculates and displays the original live time and the current time-shift playing progress of the current time-shift playing content; and under a fast forward-fast backward mode of live time-shift, the playing terminal of the IPTV set-top box peels off filling data in media data released by the time-shift server and only transmits the valid media data into a hardware decoder. By adopting the method disclosed by the invention, the playing terminal of the IPTV set-top box can reflect the current time-shift playing progress truthfully during the live time-shift process, and image mosaic phenomenon can be effectively eliminated under the fast forward-fast backward mode of live time-shift, thus enhancing the use experience of a user.
Description
Technical field
The present invention relates to IPTV set-top box technique field, particularly relate to a kind of direct broadcast time-shift processing method of IPTV STB.
Background technology
IPTV (Intemet Protocol Television; Internet Protocol Television) is IPTV; Be to be transmission channel with the telecommunications broadband network; With the television set is playback terminal, to the technology that the domestic consumer provides the multiple interactive services that comprises television content, can watch through the mode of general television set+network machine top box.The main feature of IPTV is in its interactivity, has given the user with initiative, select program and broadcast mode by the user, and direct broadcast time-shift is the important featured function of IPTV.
Direct broadcast time-shift is based on a kind of personalized service of live telecast; Compare with conventional digital tv; Direct broadcast time-shift lets the user when watching live television programming, can realize the time-out of program and retreats, for the program that has broadcasted; In the direct broadcast time-shift broadcast scope that the time shift server is supported, can realize from the fast forwarding and fast rewinding of playback of random time point and various multiples.In the direct broadcast time-shift broadcast scope that the time shift server is supported, the constraint of the program log that the user is no longer fixed realizes the control fully that program is broadcasted.
But there are following two problems in IPTV STB playback terminal when realizing the direct broadcast time-shift function at present:
(1) because the direct broadcast time-shift decorum that is based on time shift server end buffer memory that the IPTV system adopts; Shifting state needed to obtain media data with the time shift server interaction when IPTV STB playback terminal got into; And can't be directly know that by media data direct broadcast time-shift plays the original live time of scope and current time shifting broadcasting content, cause IPTV STB playback terminal the time can't show the playing progress rate of current time shift under the shifting state in real time.
(2) under the IPTV direct broadcast time-shift fast forwarding and fast rewinding pattern; IPTV time shift server sends media data with the mode of key frame; And media data is packaged into after TS (Transport Stream the transmits stream) packet, by RTP (Real-time Transport Protocol; RTP) carry, the bag of each RTP (1500 byte) maximum can be held 7 TS bags (188 byte).Because platform side does not have separately the key frame media data under the fast forwarding and fast rewinding pattern to be encapsulated; So comprise the TS bag of frame of video start information not necessarily is exactly first TS bag of a RTP bag; Equally; The TS bag that comprises the frame of video end of data also is not necessarily last TS bag of a RTP bag, if give hardware decoder with such RTP bag data, will causing decoding perhaps, mosaic appears in decoded image.
Summary of the invention
The objective of the invention is in order to overcome the deficiency of above-mentioned background technology; A kind of direct broadcast time-shift processing method of IPTV STB is provided; Make IPTV STB playback terminal in the direct broadcast time-shift process, reflect current time shifting broadcasting progress in real time; And under the fast forwarding and fast rewinding pattern of direct broadcast time-shift, effectively eliminated the phenomenon of image mosaic, promoted user's experience.
The direct broadcast time-shift processing method of IPTV STB provided by the invention; May further comprise the steps: A, under the direct broadcast time-shift pattern; IPTV STB playback terminal and time shift server carry out alternately through real time streaming transport protocol RTSP; Obtain direct broadcast time-shift reproduction time scope, calculate and show the original live time and the current time shifting broadcasting progress of current time shifting broadcasting content; B, under the fast forwarding and fast rewinding pattern of direct broadcast time-shift, IPTV STB playback terminal is peeled off the padding data in the media data that the time shift server issues, and only the efficient media data is sent into hardware decoder.
In technique scheme; The process of obtaining direct broadcast time-shift reproduction time scope described in the steps A is following: IPTV STB playback terminal sends the request message that obtains direct broadcast time-shift reproduction time range parameter to the time shift server; The time shift server returns the response message that comprises the time range field, and IPTV STB playback terminal obtains direct broadcast time-shift reproduction time range parameter from the time range field of said response message.
In technique scheme; The STB of IPTV described in steps A playback terminal record gets into the local system time point T1 in the direct broadcast time-shift moment and the local system time T 2 of current time shift loca; Calculate local time shift duration Δ T; Combine time shifting broadcasting speed V again, calculate the original live time T of current time shifting broadcasting content.
In technique scheme, said local time shift duration Δ T=T2-T1, the original live time T of said current time shifting broadcasting content=T1+ Δ T*V=T1+ (T2-T1) * V.
In technique scheme, under fast-forward mode, said time shifting broadcasting speed V be on the occasion of, V is a negative value under backward mode, V is zero under park mode.
In technique scheme, according to the original live time T of said direct broadcast time-shift reproduction time scope and current time shifting broadcasting content, calculate and show current time shifting broadcasting progress in the steps A.
In technique scheme; Step B may further comprise the steps: B1, under the fast forwarding and fast rewinding pattern of direct broadcast time-shift; The header packet information of realtime transmission protocol RTP bag in the media data that IPTV STB playback terminal parsing time shift server issues; Judge the frame head, postamble or the frame data that comprise key frame in the said RTP bag, the row labels of going forward side by side; B2, analyze, search for the transmission stream TS data in this RTP bag, confirm and mark comprises the position of the TS bag of key frame frame head/postamble being labeled as the RTP bag that comprises key frame frame head/postamble; B3, peel off the filling TS data except that key frame, the efficient media data are sent into hardware decoder.
In technique scheme, the packet header of RTP described in step B1 bag is made up of 12 standard packet header bytes and 8 extension header bytes, and wherein, preceding 2 bits of the 19th byte are 00 o'clock, representes to comprise the key frame frame head in the TS data of back, said packet header; Preceding 2 bits of the 19th byte are 01 o'clock, and the data of representing back, said packet header are key frame frame data; Preceding 2 bits of the 19th byte are 10 o'clock, represent to comprise the key frame postamble in the TS data of back, said packet header.
In technique scheme; Among the step B2; For being labeled as the RTP bag that comprises the key frame frame head,, then confirm to comprise the key frame frame head in this TS bag if search sequence parameter set layer SPS initial code in certain TS bag therein; Be key frame data from this TS packet start in this RTP bag, write down the position, packet header of this TS bag; For being labeled as the RTP bag that comprises the key frame postamble, if search the frame initial code in the bag of TS therein, confirm that then the previous TS bag of this TS bag is the key frame postamble, write down the position, packet header of this TS bag.
In technique scheme, step B3 carries out by following three kinds of situation:
(1), gives hardware decoder with all media datas from the TS packet start at sequence parameter set layer SPS place in this RTP bag for the RTP bag that comprises the key frame frame head;
(2), give hardware decoder with TS bag and all media datas before thereof at key frame postamble place in this RTP bag for the RTP bag that comprises the key frame postamble;
(3), give hardware decoder with all media datas in this RTP bag for the RTP bag that only comprises the key frame frame data.
Compared with prior art, advantage of the present invention is following:
The present invention makes IPTV STB playback terminal in the direct broadcast time-shift process, reflect current time shifting broadcasting progress strictly according to the facts, and under direct broadcast time-shift fast forwarding and fast rewinding pattern, has eliminated the phenomenon of image mosaic effectively, has promoted user's experience.
Description of drawings
Fig. 1 is the flow chart that playback terminal upgrades the time shifting broadcasting progress in the embodiment of the invention.
Fig. 2 is that the flow chart that direct broadcast time-shift is play scope is obtained in playback terminal and time shift server interaction in the embodiment of the invention.
Fig. 3 is that playback terminal upgrades the flow chart that current time shift shows the time in the embodiment of the invention.
Fig. 4 is that playback terminal issues the flow chart that key frame data is obtained in search in the RTP bag from the time shift server in the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is made further detailed description.
The direct broadcast time-shift processing method of the IPTV STB that the embodiment of the invention provides may further comprise the steps:
A, under the direct broadcast time-shift pattern; IPTV STB playback terminal and time shift server carry out alternately through RTSP (Real Time Streaming Protocol real time streaming transport protocol); Obtain direct broadcast time-shift reproduction time scope, calculate and show the original live time T and the current time shifting broadcasting progress of current time shifting broadcasting content.
Referring to shown in Figure 1, the idiographic flow of steps A is following:
Step 101: under the direct broadcast time-shift pattern, IPTV STB playback terminal obtains direct broadcast time-shift reproduction time scope through carrying out the RTSP protocol interaction with the time shift server.
Step 102: record time shifting broadcasting duration; Calculate and show the original live time of current time shifting broadcasting content: IPTV STB playback terminal record gets into the local system time point T1 in the direct broadcast time-shift moment and the local system time T 2 of current time shift loca; Calculate local time shift duration Δ T=T2-T1, combine time shifting broadcasting speed V again, calculate the original live time T of current time shifting broadcasting content: T=T1+ Δ T*V=T1+ (T2-T1) * V; Under fast-forward mode; V be on the occasion of, V is a negative value under backward mode, V is zero under park mode.
Step 103:, calculate and demonstration direct broadcast time-shift playing progress rate according to the original live time of direct broadcast time-shift reproduction time scope and current time shifting broadcasting content.
Referring to shown in Figure 2, the detailed process of obtaining direct broadcast time-shift reproduction time scope is following:
Step 201:IPTV STB playback terminal sends the request message that obtains direct broadcast time-shift reproduction time range parameter to the time shift server;
Step 202: the time shift server returns the response message that comprises the time range field;
Step 203:IPTV STB playback terminal obtains direct broadcast time-shift reproduction time range parameter from the time range field of the response message received.
In embodiments of the present invention; IPTV STB playback terminal direct broadcast time-shift is play obtaining of scope need be by the GET_PARAMETER message of RTSP agreement; From time shift server acquisition time range parameter, the time range parameter is GET_PARAMETER critical field x-Timeshift_Range (telecommunications expansion).For example: x-Timeshift_Range:clock=20100318T021915.84Z-20100318T031 915.84Z; Be 3: 19: 15.84 on the 18th March of 2: 19 15.84 seconds to 2010 on the 18th March of 2010 Greenwich Mean Time, can know that the time shifting broadcasting scope is one hour.
Referring to shown in Figure 3, calculate and show that the idiographic flow of original live time T of current time shifting broadcasting content is following:
Step 301: record gets into direct broadcast time-shift local system time point T1 (for example 3:19) constantly, as time shift time started stStartTime.
Step 302: give current time shift with the time shift time started (being 3:19) as initial value and show time currentTime.
Step 303: judge whether IPTV STB playback terminal is in the direct broadcast time-shift pattern, if then forward step 304 to; Otherwise, forward step 307 to.
Step 304: after time shift continues a period of time, obtain the local system time stTimeNow of current time shift loca, i.e. T2 (for example 3:00).
Step 305: calculate local time shift duration Δ T: the difference differentTime of the local system time stTimeNow (being T2) of current time shift loca and time shift time started point stStartTime (being T1); Be local time shift duration Δ T, i.e. Δ T=T2-T1 (being 3:00-3:19).
Step 306: combine time shifting broadcasting speed V again, calculate the original live time T of current time shifting broadcasting content, current time shift shows time currentTime+=(differentTime* time shifting broadcasting speed); Be T=T1+ Δ T*V=T1+ (T2-T1) * V, under fast-forward mode, V be on the occasion of; V is a negative value under backward mode; 2 times of fast rewind downs for example, then original live time T=3:19+ (3:00-3:19) * (2)=2:41, V is zero under park mode.According to the original live time T of direct broadcast time-shift reproduction time scope and current time shifting broadcasting content, calculate and demonstration direct broadcast time-shift playing progress rate.
Step 307: the current time of returning direct broadcast time-shift.
B, under the fast forwarding and fast rewinding pattern of direct broadcast time-shift, IPTV STB playback terminal is peeled off the padding data in the media data that the time shift server issues, and only the efficient media data is sent into hardware decoder.
The idiographic flow of step B is following:
B1, under the fast forwarding and fast rewinding pattern of direct broadcast time-shift, IPTV STB playback terminal is resolved the header packet information of RTP bag in the media data that the time shift server issues, and judges the frame head, postamble or the frame data that comprise key frame in the RTP bag, the row labels of going forward side by side.
The media data that the time shift server issues in fast forwarding and fast rewinding is carried by RTP; And RTP packet header is made up of 20byte; Preceding 12byte is standard RTP head (referring to the definition of RFC1889), and back 8byte is that wherein the implication of the preceding 2bit of 19byte is following by the self-defining expansion of platform RTP head:
00: represent to comprise the key frame frame head in the TS data of this back, packet header;
01: the TS data of representing this back, packet header are key frame frame data;
10: represent to comprise the key frame postamble in the TS data of this back, packet header.
B2, analyze, search for the TS data in this RTP bag, confirm and mark comprises the position of the TS bag of key frame frame head/postamble being labeled as the RTP bag that comprises key frame frame head/postamble.For being labeled as the RTP bag that comprises the key frame frame head; If search SPS (Sequence Parameter Sets sequence parameter set layer) initial code in certain TS bag therein; Then confirm to comprise the key frame frame head in this TS bag; Be key frame data from this TS packet start in this RTP bag, write down the position, packet header of this TS bag; For being labeled as the RTP bag that comprises the key frame postamble, if search Slice (frame) initial code in certain TS bag therein, comprise the key frame postamble in the previous TS bag of then definite this TS bag, write down the position, packet header of this TS bag.
For coding (IPTV commonly used H.264 coding) H.264, need find sequence parameter set SPS to decode, the sequence parameter set followed be picture parameter set, be only the key frame frame head then.Initial code in the TS packet is made up of start code prefix (3bytes or 4bytes) and initial code value (1bytes).When in the TS packet, finding start code prefix 0,x00 00 01 (perhaps 0,x00 00 00 01), and the back 5bit of the back initial code value of closelying follow is 0x07, then found SPS, also just found the key frame frame head.When in the TS packet, finding start code prefix 0,x00 00 01 (perhaps 0,x00 00 00 01); And the 5bit of the initial code value that closely follow the back is the beginning that 0x01 then representes a useless frame; And the ending of key frame has also just been found in the end that begins to represent a key frame of a useless frame.
B3, peel off the filling TS data except that key frame, the efficient media data sent into hardware decoder, carry out by following three kinds of situation:
(1), gives hardware decoder with all media datas from the TS packet start at sequence parameter set layer SPS place in this RTP bag for the RTP bag that comprises the key frame frame head;
(2), give hardware decoder with TS bag and all media datas before thereof at key frame postamble place in this RTP bag for the RTP bag that comprises the key frame postamble;
(3), give hardware decoder with all media datas in this RTP bag for the RTP bag that only comprises the key frame frame data.
Referring to shown in Figure 4, the flow process that key frame data is obtained in playback terminal search from the RTP bag that the time shift server issues is following:
Step 401: receive a RTP bag.
Step 402: resolve and the preceding 2bit that judges 19byte in the RTP bag is 00,01 still be 10, if 00 (representing that this RTP comprises H.264 key frame frame head in wrapping) then forwarded step 403 to; If 01 (representing to comprise H.264 key frame frame data in this RTP bag) then forwarded step 405 to; If 10 (representing to comprise H.264 key frame postamble in this RTP bag) then forwarded step 406 to.
Step 403: search the H.264 key frame frame head of compressed bit stream, record comprises the TS bag position, packet header of sequence parameter set layer SPS.
Step 404: will comprise in the RTP bag of key frame frame head from media data and give hardware decoder from the TS packet start at sequence parameter set layer SPS place.
Step 405:, give hardware decoder with the whole media datas in this RTP bag to only comprising the RTP bag of key frame frame data.
Step 406: search the H.264 key frame postamble of compressed bit stream, record comprises the TS bag position, packet header of key frame postamble.
Step 407:, give hardware decoder with all media datas before the TS bag at key frame postamble place in this RTP bag to comprising the RTP bag of key frame postamble.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.The content of not doing in this specification to describe in detail belongs to this area professional and technical personnel's known prior art.
Claims (10)
1. the direct broadcast time-shift processing method of an IPTV STB is characterized in that may further comprise the steps:
A, under the direct broadcast time-shift pattern; IPTV STB playback terminal and time shift server carry out alternately through real time streaming transport protocol RTSP; Obtain direct broadcast time-shift reproduction time scope, calculate and show the original live time and the current time shifting broadcasting progress of current time shifting broadcasting content;
B, under the fast forwarding and fast rewinding pattern of direct broadcast time-shift, IPTV STB playback terminal is peeled off the padding data in the media data that the time shift server issues, and only the efficient media data is sent into hardware decoder.
2. the direct broadcast time-shift processing method of IPTV STB as claimed in claim 1; It is characterized in that: the process of obtaining direct broadcast time-shift reproduction time scope described in the steps A is following: IPTV STB playback terminal sends the request message that obtains direct broadcast time-shift reproduction time range parameter to the time shift server; The time shift server returns the response message that comprises the time range field, and IPTV STB playback terminal obtains direct broadcast time-shift reproduction time range parameter from the time range field of said response message.
3. the direct broadcast time-shift processing method of IPTV STB as claimed in claim 2; It is characterized in that: the STB of IPTV described in steps A playback terminal record gets into the local system time point T1 in the direct broadcast time-shift moment and the local system time T 2 of current time shift loca; Calculate local time shift duration Δ T; Combine time shifting broadcasting speed V again, calculate the original live time T of current time shifting broadcasting content.
4. the direct broadcast time-shift processing method of IPTV STB as claimed in claim 3 is characterized in that: said local time shift duration Δ T=T2-T1, the original live time T of said current time shifting broadcasting content=T1+ Δ T*V=T1+ (T2-T1) * V.
5. the direct broadcast time-shift processing method of IPTV STB as claimed in claim 4 is characterized in that: under fast-forward mode, said time shifting broadcasting speed V be on the occasion of, V is a negative value under backward mode, V is zero under park mode.
6. the direct broadcast time-shift processing method of IPTV STB as claimed in claim 4 is characterized in that: according to the original live time T of said direct broadcast time-shift reproduction time scope and current time shifting broadcasting content, calculate and show current time shifting broadcasting progress in the steps A.
7. like the direct broadcast time-shift processing method of each described IPTV STB of claim 1 to 6, it is characterized in that: step B may further comprise the steps:
B1, under the fast forwarding and fast rewinding pattern of direct broadcast time-shift; The header packet information of realtime transmission protocol RTP bag in the media data that IPTV STB playback terminal parsing time shift server issues; Judge the frame head, postamble or the frame data that comprise key frame in the said RTP bag, the row labels of going forward side by side;
B2, analyze, search for the transmission stream TS data in this RTP bag, confirm and mark comprises the position of the TS bag of key frame frame head/postamble being labeled as the RTP bag that comprises key frame frame head/postamble;
B3, peel off the filling TS data except that key frame, the efficient media data are sent into hardware decoder.
8. the direct broadcast time-shift processing method of IPTV STB as claimed in claim 7; It is characterized in that: the packet header of the bag of RTP described in the step B1 is made up of 12 standard packet header bytes and 8 extension header bytes; Preceding 2 bits of the 19th byte are 00 o'clock, represent to comprise the key frame frame head in the TS data of back, said packet header; Preceding 2 bits of the 19th byte are 01 o'clock, and the data of representing back, said packet header are key frame frame data; Preceding 2 bits of the 19th byte are 10 o'clock, represent to comprise the key frame postamble in the TS data of back, said packet header.
9. the direct broadcast time-shift processing method of IPTV STB as claimed in claim 8; It is characterized in that: among the step B2; For being labeled as the RTP bag that comprises the key frame frame head,, confirm that then this TS comprises the key frame frame head if search sequence parameter set layer SPS initial code in certain TS bag therein; Be key frame data from this TS packet start in this RTP bag, write down the position, packet header of this TS bag; For being labeled as the RTP bag that comprises the key frame postamble, if in the TS bag, search the frame initial code, confirm that then the previous TS bag of this TS bag is the key frame postamble, write down the position, packet header of this TS bag.
10. the direct broadcast time-shift processing method of IPTV STB as claimed in claim 9 is characterized in that: step B3 carries out by following three kinds of situation:
(1), gives hardware decoder with all media datas from the TS packet start at sequence parameter set layer SPS place in this RTP bag for the RTP bag that comprises the key frame frame head;
(2), give hardware decoder with TS bag and all media datas before thereof at key frame postamble place in this RTP bag for the RTP bag that comprises the key frame postamble;
(3), give hardware decoder with all media datas in this RTP bag for the RTP bag that only comprises the key frame frame data.
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| CN109348282A (en) * | 2018-11-19 | 2019-02-15 | 深圳市炬力北方微电子有限公司 | A kind of wireless method and device for throwing screen time delay of reduction |
| CN109660549A (en) * | 2018-12-29 | 2019-04-19 | 贵阳朗玛信息技术股份有限公司 | A kind of video requency frame data packet sending, receiving method and device |
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