JP4207556B2 - Playback apparatus and method, and program - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a playback apparatus and method, and a program, and more particularly, to a playback apparatus and method, and a program that can appropriately perform playlist playback.
[0002]
[Prior art]
FIG. 1 shows an example of the configuration of a conventional editing apparatus 2 that performs playlist reproduction on content (for example, video data) recorded on a randomly accessible optical disc 1 (see, for example, Patent Document 1). ).
[0003]
Here, the playlist playback is the ID of the file storing the video data to be played back, the edit point information indicating the start point X and the end point Y of the video data to be played back, as shown in FIG. Based on a playlist in which the playback order is set, the video data set there is played according to the playback order.
[0004]
That is, in the case of the example of FIG. 2, as shown in FIG. 3, the video data F1-2 of the start point X1 to the end point Y1 of the content stored in the file F1 to the file F3 recorded on the optical disc 1, Video data F2-2 from start point X2 to end point Y2, video data F3-1 from start point X3 to end point Y3, and video data F3-4 from start point X4 to end point Y4 are video data F1-2, The video data F3-1, video data F2-2, and video data F3-4 are reproduced in this order.
[0005]
In the following, data reproduced by play list reproduction (in the example of FIGS. 2 and 3, video data F1-2, video data F3-1, video data F2-2, and video data F3-4) are appropriately stored. This is referred to as data to be edited.
[0006]
The configuration of the editing device 2 will be described. The drive 11 seeks an optical pickup (not shown) onto the optical disc 1 under the control of the control unit 14, reads the editing target data recorded therein, and supplies the read editing target data to the buffer memory 12. To do.
[0007]
The buffer memory 12 stores data to be edited from the drive 11.
[0008]
The signal processing unit 13 includes an MPEG (Moving Picture Experts Group) decoder, a video output interface, and the like. Under the control of the control unit 14, the data to be edited is read out from the buffer memory 12 and decoded. The video signal is output to the display device 3. The display device 3 displays an image corresponding to the input video signal.
[0009]
The drive 11 reads the data to be edited from the optical disk 1 and supplies it to the buffer memory 12 at a predetermined reading rate Rr. The signal processor 13 reads the data to be edited from the buffer memory 12 and Reproduction output is performed at a predetermined reproduction rate Rp. Further, the reading rate Rr is assumed to be larger than the reproduction rate Rp.
[0010]
For example, the control unit 14 stores a playlist created by the user operating the user interface 15, and performs playlist playback according to the playlist.
[0011]
FIG. 4 shows a trajectory of the data amount of the data to be edited read from the optical disc 1 (solid line Lr in the figure) when the editing apparatus 2 (control unit 14) reproduces the playlist according to the playlist of FIG. The locus of the data amount of the edit target data decoded and output (dotted line Lp in the figure) is shown.
[0012]
According to the solid line Lr, the video data F1-2, video data F3-1, video data F2-2, and video data F3-4 are read in time Tr1, Tr2, Tr3, Tr4, respectively. . The seek from the position where the video data F1-2 is recorded to the position where the video data F3-1 is recorded, and the video data F2-2 are recorded from the position where the video data F3-1 is recorded. The seek to the position and the seek from the position where the video data F2-2 is recorded to the position where the video data F3-4 is recorded take time Ts1, Ts2, and Ts3, respectively.
[0013]
That is, the video data F3-1 and the video data F2-2 have a small amount of data, and a long time is required for seeking to the position where the video data F2-2 and the video data F3-4 to be reproduced next are recorded. Therefore, since the data to be edited on the playlist to be continuously played back is recorded separately, the data amount is obtained by dividing the read time Tr and the seek time Ts by the total time. As shown in FIG. 5, the substantial reading rate (hereinafter referred to as a substantial reading rate) Rq is smaller than the reproduction rate Rp.
[0014]
[Problems to be solved by the invention]
By the way, when there is data to be edited, such as the video data F3-1 and the video data F2-2, where the substantial reading rate Rq is smaller than the reproduction rate Rp, the reproduction output in the conventional playlist reproduction is indicated by the dotted line Lp in FIG. As shown, it is interrupted and cannot be performed continuously.
[0015]
In the example of FIG. 4, since the reproduction output of the video data F1-2 and the video data F3-1 is completed at time Tp1 (since the buffer memory 12 becomes empty), the video data F2-2 to be reproduced next Reproduction output is interrupted only for the time Tw1 until the storage in the buffer memory 12 is started. Thereafter, the reproduction output of the video data F2-2 is started, but the reproduction output is completed at time Tp2, so this time until the storage of the video data F3-4 to be reproduced and output next is started. Reproduction output is interrupted for the time Tw2.
[0016]
As described above, in the playlist reproduction in the conventional editing device 2, when there is data to be edited in which the substantial read rate Rq is smaller than the reproduction rate Rp, the reproduction output is not continuously performed, and the playlist reproduction is appropriately performed. I could not.
[0017]
The present invention has been made in view of such a situation, and makes it possible to appropriately perform playlist reproduction.
[0018]
[Patent Document 1]
JP 11-146330 A
[0019]
[Means for Solving the Problems]
  The playback apparatus according to the present invention eliminates the interruption of playback at the playback rate because there is no editing target data read from the storage medium.One or morePre-reading means for reading the data to be edited from the recording medium and storing it in the storage medium before the playback at the playback rate is started, and after the data to be edited is stored in the storage medium by the pre-reading means, the storage medium by the pre-reading means The data to be edited that has not been stored in the storage medium is read from the recording medium at the reading rate and stored in the storage medium, and the data to be edited is stored in the storage medium by the pre-reading means. Reproduction means for reading out and reproducing the data to be edited stored in the storage medium at the reproduction rate in the order set in the playlist after the storage in the storage medium is started.The pre-reading means adds the time required for reading at the reading rate among the plurality of data to be edited and the time required for seeking to the position where the next data to be edited is recorded. As editing target data to be read from the recording medium and stored in the storage medium before the reproduction at the playback rate is started from the editing target data having a small actual reading rate determined based on the time and the data amount of the editing target data selectIt is characterized by that.
[0020]
  It is determined whether or not the data amount of the data to be edited selected by the prefetching means is equal to or greater than the limit storage capacity of the buffer memory, and when it is determined that the data amount is equal to or greater than the limit storage capacity of the buffer memory, An information output means for outputting information indicating that the data to be edited cannot be normally reproduced can be further provided.
[0021]
The pre-reading means or reading means can read continuously edited data to be edited from the data set in the playlist as one data to be edited and store it in the storage medium.
[0022]
  The reproduction method according to the present invention eliminates the interruption of reproduction at the reproduction rate because there is no editing target data read from the storage medium.One or moreBefore the reproduction at the reproduction rate is started, the editing target data is read from the recording medium and stored in the storage medium. After the editing target data is stored in the storage medium by the processing of the prefetching step, Data to be edited that has not been stored in the storage medium in the process is read from the recording medium at the reading rate and stored in the storage medium, and the data to be edited is stored in the storage medium in the process of the pre-reading step and read. A reproduction step of reading and reproducing the editing target data stored in the storage medium in the order set in the playlist at the playback rate after the storage of the editing target data in the storage medium by the processing of the step is started. WhenIn the process of the prefetch step, the time required for reading when reading at the reading rate and the time required for seeking to the position where the next data to be read is recorded are included in the processing of the prefetch step. Data to be edited that is read from the recording medium and stored in the storage medium before the reproduction at the reproduction rate is started from the data to be edited having a small actual reading rate determined based on the added time and the data amount of the data to be edited. Choose asIt is characterized by that.
[0023]
  According to the program of the present invention, since there is no editing target data read from the storage medium, the playback at the playback rate is not interrupted.One or moreThe data to be edited is stored in the storage medium by the pre-reading control step for controlling reading from the recording medium and storage in the storage medium before the playback at the playback rate is started, and the processing of the pre-reading control step. A read control step for controlling reading of the data to be edited, which has not been stored in the storage medium in the process of the prefetch control step, from the recording medium at the read rate and storage in the storage medium; After the edit target data is stored in the storage medium by the processing and the storage of the edit target data in the storage medium by the process of the reading control step is started, the edit target data stored in the storage medium is stored in the playlist. A playback control step for controlling reading and playback at a playback rate in a set order; andIn the process of the prefetch control step, among the plurality of edit target data, the time required for reading when read at the read rate, the time required for seeking to the position where the next read target edit data is recorded, To be read from the recording medium and stored in the storage medium before the reproduction at the reproduction rate is started from the editing target data having a small actual reading rate determined based on the amount of time and the data amount of the editing target data Select as dataIt is characterized by that.
[0024]
  In the playback apparatus and method and the program of the present invention, since there is no editing target data read from the storage medium, playback at the playback rate is not interrupted.One or moreThe editing target data is read from the recording medium and stored in the storage medium before the playback at the playback rate is started, and the editing target data is not stored in the storage medium after the editing target data is stored in the storage medium. Is read from the recording medium at the reading rate and stored in the storage medium, the editing target data is stored in the storage medium, and the storage of the other editing target data in the storage medium is started. The stored data to be edited is read and reproduced at the reproduction rate in the order set in the playlist. Also,Of the multiple edit target data, the time taken to read when read at the read rate and the time taken to seek to the position where the next read target edit data is recorded, and the edit target data Is selected as data to be edited and read from a recording medium and stored in a storage medium before reproduction at the reproduction rate is started.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 6 shows a configuration example of the editing apparatus 21 to which the present invention is applied. That is, the editing device 21 is provided with a control unit 31 instead of the control unit 14 of the editing device 2 of FIG. Other parts are the same as those in the editing apparatus 2 of FIG.
[0026]
Here, as shown in FIG. 7, the ID of the file on the optical disc 1 in which the edit target data is stored, the time code Cb indicating the start point and the end point of the edit target data, and the reproduction of the time code Cb. The video data of the time codes Cb1 to Ce1 of the contents (for example, video) stored in the files F11 to F13 as shown in FIG. F11-2, video data F12-2 of time codes Cb2 to Ce2, video data F13-1 of time codes Cb3 to Ce3, and video data F13-4 of time codes Cb4 to Ce4 are referred to as video data F11-2 (hereinafter referred to as “F11-2”). Editing target segment SG1), video data F13-1 (hereinafter referred to as editing target) Of the editing device 21 when reproducing in the order of video data F12-2 (hereinafter referred to as an editing target segment SG3) and video data F13-4 (hereinafter referred to as an editing target segment SG4). An outline of the operation will be described.
[0027]
When the editing target segments SG1 to SG4 are reproduced in the conventional manner, the continuity of reproduction output is not ensured as shown in FIG. Therefore, the editing device 21 edits reading from the optical disc 1 of the editing target segments SG2 and SG3 among the editing target segments SG1 to SG4, for example, as shown in FIG. 10, where the actual reading rate Rq is smaller than the reproduction rate Rp. Prior to reproduction output of the target segment SG (prefetching). Specifically, as indicated by the solid line Lr in FIG. 11, after prefetching the editing target segments SG2 and SG3 from time t1, reproduction output of the editing target segment SG is started from time t5 as indicated by the dotted line Lp. .
[0028]
That is, the buffer memory 12 stores in advance data that does not become empty even when the reproduction output is started and the editing target segment SG is read at the reproduction rate Rp (data for which reproduction output is not interrupted). Therefore, as shown by the dotted line Lp in FIG. 11, the playlist reproduction is continuously performed. Further, prefetching reduces the number of times of reading of the editing target segment SG after the start of reproduction output (since the number of seeks is reduced), so that the load on the control unit 31 can be reduced.
[0029]
Next, a process of selecting a prefetched edit target segment (hereinafter referred to as a prefetch target segment) SG will be described with reference to the flowchart of FIG.
[0030]
In step S11, the control unit 31 of the editing device 21 calculates a time Tr required for reading the editing target segment SG set in the playlist PL and a time Ts required for seeking.
[0031]
In the case of the playlist PL of FIG. 7, the editing target segment SG2 is recorded from the time Tr11 to Tr14 (FIG. 9) required to read each of the editing target segments SG1 to SG4 and the position where the editing target segment SG1 is recorded. Time Ts11 required to seek to the position where the edit target segment SG2 is recorded, Time Ts12 required to seek from the position where the edit target segment SG3 is recorded to the position where the edit target segment SG3 is recorded, and the position where the edit target segment SG3 is recorded Each time Ts13 required to seek to the position where the edit target segment SG4 is recorded is calculated.
[0032]
Note that the recording area (extent in the case of UDF (Universal Disk Format)) in which the editing target segment SG is recorded is managed by an allocation descriptor. FIG. 13 shows a recording area of video data stored in the file F11. For example, the recording area of the editing target segment SG1 (video data F11-2) has an extent length of 3 and an extent pointer of 152. Is set in the allocation descriptor. That is, since the position of the editing target segment SG on the optical disc 1 can be detected by referring to the allocation descriptor, the seek time Ts is calculated based on the position of the editing target segment SG detected from the allocation descriptor.
[0033]
Note that the most time-consuming seek time Ts and average seek time Ts are times corresponding to the reproduction rate Rp. For example, as shown in FIG. 14, when the reproduction rate Rp is 36 Mbps, the seek time (worst seek time) that takes the longest is 250 msec, and the average seek time Ts is 220 msec. When the playback rate Rp is 72 Mbps, the worst seek time Ts is 680 msec, and the average seek time Ts is 570 msec.
[0034]
Further, for example, as shown in FIG. 15, the playback rate Rp is 11 Mbps at the DVD 1 × speed, 36 Mbps at the 1 × blue laser disc, and 72 Mbps at the 2 × blue laser disc. is there.
[0035]
The reading rate Rr is a value corresponding to the compression method. For example, as shown in FIG. 16, when conforming to the IMX50 standard, it is 50 Mbps or 56 Mbps, and when conforming to the DV25 standard, it is 25 Mbps or 28 Mbps.
[0036]
Returning to FIG. 12, in step S12, the control unit 31 does not pre-read the editing target segment SG that is not set as the pre-read target segment SG, and plays it back in the order of the playlist PL. It is determined whether or not it can be secured. If it is determined that it cannot be secured, the process proceeds to step S13.
[0037]
In this case, none of the editing target segments SG1 to SG4 is set as the prefetch target segment SG, and when these are reproduced as they are, the continuity of the reproduction output can be ensured as shown in FIG. Since this is not possible, the process proceeds to step S13.
[0038]
In the case of this example, as shown in FIG. 11, the reading of the editing target segment SG (SG1) other than the prefetching target segment SG and the reproduction output of the editing target segment SG stored in the buffer memory 12 are performed almost simultaneously. (Time t5).
[0039]
In step S <b> 13, the control unit 31 selects an editing target segment SG that is not set as the prefetching target segment SG and has the smallest effective reading rate Rq.
[0040]
In this case, the edit target segment SG2 is selected from the edit target segments SG1 to SG4.
[0041]
Next, in step S14, the control unit 31 calculates the total data amount of the editing target segment SG selected in step S13 (the processing in steps S12 to S15 is determined as YES in step S16 described later). The total amount of data of the plurality of editing target segments SG selected in step S13 is then calculated). Then, the control unit 31 determines whether or not the calculated total data amount is smaller than the limit storage capacity BL of the buffer memory 12, and if it is determined that the total data amount is less than the limit storage capacity BL, the process proceeds to step S15, and in step S13 The selected editing target segment SG is set as the prefetch target segment SG.
[0042]
In this case, only the editing target segment SG2 is selected in step S13, and the amount of data is smaller than the limit storage capacity BL of the buffer memory 12, so the process proceeds to step S15, where the editing target segment SG2 is the same as the prefetch target segment SG. Is done.
[0043]
Next, in step S16, the control unit 31 determines whether or not pre-reading is necessary for all the editing target segments SG in step S13, and unedited editing target segments SG still remain. If it is determined that there is, the process returns to step 12.
[0044]
In this case, for the editing target segments SG1, SG3, SG4, the necessity of prefetching has not been confirmed yet, and the process returns to step S12. According to this example, the processing after step S12 will be described again. In step S12, only the editing target segment SG2 that was set as the prefetching target segment SG in the previous step S15 is prefetched, and the other editing target segments SG1, SG3, SG4 are processed. When the reproduction is output without prefetching, it is determined whether or not the continuity of the reproduction output is ensured. In this case, as shown in FIG. 17, the reproduction output is interrupted at time t31, and the continuity of the reproduction output is not ensured, so the process proceeds to step S13.
[0045]
In step S13, the edit target segment SG3 having the smallest substantial read rate Rq is selected from the edit target segments SG1, SG3, and SG4 that are not set as the prefetch target segment SG.
[0046]
In step S14, it is determined whether or not the total data amount V obtained by adding the data amounts of the editing target segments SG2 and SG3 is smaller than the limit storage capacity BL of the buffer memory 12. In this case, since the total data amount V of the edit target segments SG2 and SG3 is smaller than the limit storage capacity BL of the buffer memory 12 as shown in FIG. 11, the process proceeds to step S15. In step S15, the edit target segment SG3 is set as the prefetch target segment SG.
[0047]
In step S16, for the editing target segments SG1 and SG4, the necessity for prefetching has not yet been confirmed, so a NO determination is made and the process returns to step S12. Next, the processing after step S12 will be described. In step S12, only the editing target segments SG2 and SG3 that were set as the prefetching segment SG in the previous step S15 are prefetched, and the other editing target segments SG1 and SG4 are prefetched. In the case where the reproduction output is performed without any change, the continuity of the reproduction output is ensured as shown in FIG. 11, so that a determination of YES is made and the process ends. That is, in the event of playlist reproduction based on the playlist PL of FIG. 7, the editing target segments SG2 and SG3 are set as prefetch target segments SG.
[0048]
If it is determined in step S14 that the total data amount of the editing target segment SG selected in step S13 is greater than or equal to the limit storage capacity BL of the buffer memory 12, prefetching is performed to ensure the continuity of the reproduction output. Since it is impossible to prefetch all the necessary editing target segments SG, the control unit 31 presents to the user via the user interface 15 in step S17 that, for example, continuity of reproduction output cannot be secured, Thereafter, the process is terminated.
[0049]
As described above, the prefetch target segment is selected.
[0050]
In the above, as shown in FIG. 11, the reading of the editing target segment SG other than the prefetching target segment SG and the reproduction output of the editing target segment SG stored in the buffer memory 12 are performed almost simultaneously. (Time t5), as shown in FIG. 18, the reproduction output of the editing target segment SG starts from the reading of the editing target segment SG other than the prefetching target segment SG (time t41), and from the time t42 when a predetermined time has elapsed. It may be started.
[0051]
In this case, as shown in FIG. 18, even if only the editing target segment SG2 is prefetched and the other editing target segments SG1, S3, S4 are reproduced and output without prefetching, the continuity of the reproduction output is ensured. Therefore, only the editing target segment SG2 is prefetched.
[0052]
In the above description, reading is performed for each editing target segment SG. However, as shown in FIGS. 19 and 20, a plurality of editing target segments SG that are continuously played back are referred to as one segment (hereinafter referred to as a combined segment). Can be read.
[0053]
As shown in FIG. 20, when the combined segment is convex downward, it is necessary to calculate the actual reading rate Rq in consideration of the transmission delay SD.
[0054]
Next, the procedure of reading the segment to be edited and its reproduction output will be described with reference to the flowchart of FIG.
[0055]
In step S <b> 21, the control unit 31 of the editing device 21 controls the drive 11 to read the editing target segment SG that has been set as the prefetching target segment SG as described above from the optical disc 1 and store it in the buffer memory 12. .
[0056]
In the case of play list reproduction by the play list PL of FIG. 7, as shown in FIG. 11, reading of the segment to be edited SG2 is started at time t1, and is completed at time t2. After that, the edit target segment SG3 is sought to the position where it is recorded, and from time t3, reading of the edit target segment SG3 is started and completed at time t4. After that, the edit target segment SG1 is seeked to the position where it is recorded.
[0057]
Next, in step S22, the control unit 31 controls the drive 11 to start reading the editing target segment SG that has not been read in step S21 (the editing target segment SG other than the prefetch target segment SG), and the signal The processing unit 13 is controlled to start reproduction output of the editing target segment SG stored in the buffer memory 12.
[0058]
As a result, as indicated by the solid line Lr in FIG. 11, reading of the editing target segment SG1 is started from time t5 and seek to the position where the editing target segment SG4 is recorded (time t9). Reading of SG4 is started.
[0059]
On the other hand, as shown by the dotted line Lp in FIG. 11, the reproduction output of the editing target segment SG1 is from the time when reading of the editing target segment SG1 is started (time t5). Is started) (after being stored in the buffer memory 12), and thereafter the reproduction target segments SG2, SG3, SG4 are reproduced and output without interruption.
[0060]
Next, in step S23, the control unit 31 determines whether or not data corresponding to the limit storage capacity BL is accumulated in the buffer memory 12, and if it is determined that not enough data is accumulated, the control unit 31 proceeds to step S24. move on.
[0061]
In step S24, the control unit 31 determines whether or not the playlist reproduction should be terminated (whether all the editing target segments SG set in the playlist PL have been reproduced or whether a reproduction termination command has been issued). ), The process returns to step S23.
[0062]
If it is determined in step S23 that data for the limit storage capacity BL has been accumulated, the process proceeds to step S25, where the control unit 31 controls the drive 11 to change the reading rate Rr to the same rate as the reproduction rate Rp. To do. As a result, data exceeding the limit storage capacity BL is not accumulated in the buffer memory 12.
[0063]
For example, as indicated by the solid line Lr in FIG. 11, at time t6, data for the limit storage capacity BL is accumulated in the buffer memory 12, and at this time, the reading rate Rr is changed to the same rate as the reproduction rate Rp. The
[0064]
Note that the reading rate Rr is changed at the reading rate Rr only for a minimum time T so that the actual reading rate Rq becomes the same rate as the reproduction rate Rp, as shown in FIG. 22 in which the frame W in FIG. 11 is enlarged. This is performed by repeating the operation of stopping reading for a predetermined time after reading.
[0065]
Returning to FIG. 21, in step S26, the control unit 31 waits until the data amount of the data stored in the buffer memory 12 becomes smaller than the limit storage capacity BL. 11 to return the reading rate Rr to the original rate.
[0066]
For example, as indicated by the solid line Lr in FIG. 11, the data amount (BL ′) of the data stored in the buffer memory 12 is smaller than the limit storage capacity BL at time t7, so that the reading rate Rr is Return to the original rate. That is, after that, reading of the edit target segment SG4 (video data F13-4) starting from time t9 is performed at the original reading rate Rr.
[0067]
Thereafter, the processing returns to step S23, and the subsequent processing is performed. If it is determined in step S24 that the playlist reproduction should be terminated, the control unit 31 terminates the process.
[0068]
Play list reproduction is performed as described above.
[0069]
The series of processes described above can be realized by hardware, but can also be realized by software. When a series of processing is realized by software, a program constituting the software is installed in a computer, and the program is executed by the computer, whereby the editing device 31 described above is functionally realized.
[0070]
FIG. 23 is a block diagram illustrating a configuration of an embodiment of a computer 101 that functions as the editing device 31 described above. An input / output interface 116 is connected to a CPU (Central Processing Unit) 111 via a bus 115, and the CPU 111 receives commands from an input unit 118 such as a keyboard and a mouse via the input / output interface 116. When input, it is stored in a recording medium such as a ROM (Read Only Memory) 112, a hard disk 114, or a magnetic disk 131, an optical disk 132, a magneto-optical disk 133, or a semiconductor memory 134 attached to the drive 120, for example. The program is loaded into a RAM (Random Access Memory) 113 and executed. Thereby, the various processes described above are performed. Further, the CPU 111 outputs the processing result to the output unit 117 such as an LCD (Liquid Crystal Display) via the input / output interface 116 as necessary. The program is stored in advance in the hard disk 114 or ROM 112 and provided to the user integrally with the computer 101, or provided as a package medium such as the magnetic disk 131, the optical disk 132, the magneto-optical disk 133, or the semiconductor memory 134. Or can be provided to the hard disk 114 via the communication unit 119 from a satellite, a network, or the like.
[0071]
In the present specification, the step of describing the program provided by the recording medium is not limited to the processing performed in chronological order according to the described order, but is not necessarily performed in chronological order. It also includes processes that are executed individually.
[0072]
【The invention's effect】
According to the present invention, playlist reproduction can be performed appropriately.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration example of a conventional editing apparatus.
FIG. 2 is a diagram illustrating an example of a playlist.
FIG. 3 is a diagram for explaining conventional playlist reproduction;
FIG. 4 is another diagram for explaining conventional playlist reproduction;
FIG. 5 is a diagram for explaining a substantial reading rate.
FIG. 6 is a block diagram illustrating a configuration example of an editing apparatus to which the present invention is applied.
FIG. 7 is a diagram illustrating another example of a play list.
8 is a diagram for explaining playlist reproduction using the present invention based on the playlist shown in FIG. 7; FIG.
FIG. 9 is a diagram for explaining conventional playlist reproduction based on the playlist of FIG. 7;
FIG. 10 is another diagram for explaining a substantial reading rate.
11 is another diagram for explaining playlist reproduction using the present invention based on the playlist of FIG. 7; FIG.
FIG. 12 is a flowchart illustrating processing for selecting a prefetch target segment.
FIG. 13 is a diagram illustrating segments.
FIG. 14 is a diagram illustrating an example of seek time.
FIG. 15 is a diagram illustrating an example of a playback rate.
FIG. 16 is a diagram illustrating an example of a reading rate.
FIG. 17 is another diagram for explaining playlist reproduction using the present invention based on the playlist of FIG. 7;
FIG. 18 is another diagram for explaining playlist reproduction using the present invention based on the playlist of FIG. 7;
FIG. 19 is a diagram for explaining a coupling segment;
FIG. 20 is a diagram illustrating another coupling segment.
FIG. 21 is a flowchart illustrating playback output processing.
22 is an enlarged view of a range W in FIG. 21. FIG.
23 is a block diagram illustrating a configuration example of a computer 101. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Optical disk, 3 Display apparatus, 11 Drive, 12 Buffer memory, 13 Signal processing part, 15, User interface, 21 Editing apparatus, 31 Control part

Claims (5)

A plurality of editing target data set in a playback order in a playlist are read from a randomly accessible recording medium at a predetermined reading rate, stored in a storage medium, and the editing stored in the storage medium In a playback apparatus that reads out and plays back target data from the storage medium at a predetermined playback rate in the order set in the playlist,
Before the playback at the playback rate is started, the recording of one or more pieces of the editing target data corresponding to the playback rate at which the playback rate is not interrupted due to the absence of the editing target data read from the storage medium. Prefetching means for reading from a medium and storing it in the storage medium;
After the editing target data is stored in the storage medium by the pre-reading unit, the editing target data that has not been stored in the storage medium by the pre-reading unit is read from the recording medium at the reading rate. Reading means to memorize,
The editing target data stored in the storage medium after the editing target data is stored in the storage medium by the pre-reading unit, and after the reading unit starts storing the editing target data in the storage medium Reproducing means for reading out and reproducing data at the reproduction rate in the order set in the playlist ,
The pre-reading means includes a time required for reading at a reading rate among a plurality of the data to be edited, and a time required for seeking to a position where the data to be edited to be read next is recorded. Before the reproduction at the reproduction rate is started from the editing target data having a small substantial reading rate determined based on the added time and the data amount of the editing target data, the data is read from the recording medium and stored in the storage medium. A reproducing apparatus that selects the data to be edited to be stored . It is determined whether or not the data amount of the data to be edited selected by the prefetching means is greater than or equal to the limit storage capacity of the buffer memory, and the data amount is determined to be greater than or equal to the limit storage capacity of the buffer memory. The information output means for outputting information indicating that the editing target data is not normally reproduced.
The playback apparatus according to claim 1. The pre-reading unit or the reading unit reads, from the recording medium, data that is continuously reproduced from the editing target data set in the playlist as one editing target data and stores the data in the storage medium. The playback apparatus according to claim 1, wherein: A plurality of editing target data set in a playback order in a playlist are read from a randomly accessible recording medium at a predetermined reading rate, stored in a storage medium, and the editing stored in the storage medium In a playback method of a playback device that reads out and plays back target data from the storage medium at a predetermined playback rate in the order set in the playlist,
Before the playback at the playback rate is started, the recording of one or more pieces of the editing target data corresponding to the playback rate at which the playback rate is not interrupted due to the absence of the editing target data read from the storage medium. A prefetching step of reading from the medium and storing it in the storage medium;
After the editing target data is stored in the storage medium in the prefetching step process, the editing target data that has not been stored in the storage medium in the prefetching process is read from the recording medium at the reading rate. A reading step of storing in the storage medium with:
The editing target data is stored in the storage medium in the pre-reading step process, and the editing target data is started to be stored in the storage medium by the reading step process, and then stored in the storage medium. The edit target data is
A playback step of reading and playing back at the playback rate in the order set in the playlist ;
In the process of the prefetching step, among the plurality of editing target data, a time required for reading when read at the reading rate and a time required for seeking to a position where the data to be read next read is recorded Is read from the recording medium before the reproduction at the reproduction rate is started from the data to be edited having a small actual reading rate determined based on the amount of time and the data amount of the data to be edited. A reproduction method comprising selecting the data to be edited stored in a medium . A plurality of editing target data set in a playback order in a playlist are read from a randomly accessible recording medium at a predetermined reading rate, stored in a storage medium, and the editing stored in the storage medium A program for reading out and reproducing target data from the storage medium at a predetermined reproduction rate in the order set in the playlist,
The recording before the reproduction at the reproduction rate is started with respect to one or a plurality of the pieces of editing object data for which the reproduction at the reproduction rate is not interrupted by the absence of the editing object data read from the storage medium A prefetch control step for controlling reading from the medium and storage in the storage medium;
After the editing target data is stored in the storage medium in the prefetch control step processing, the editing target data that has not been stored in the storage medium in the prefetch control step processing from the recording medium. A reading control step for controlling reading at a reading rate and storage in the storage medium;
The edit target data is stored in the storage medium in the process of the prefetch control step, and the storage of the edit target data in the storage medium by the process of the read control step is started, and then stored in the storage medium. A reproduction control step for controlling reading and reproduction at the reproduction rate in the order set in the playlist of the data to be edited ,
In the pre-reading control step, of the plurality of editing target data, it takes time to read when reading at the reading rate and seeks to a position where the next editing target data to be read is recorded. Before the reproduction at the reproduction rate is started from the editing target data having a small substantial reading rate determined based on the time obtained by adding the time and the data amount of the editing target data, the reading is performed from the recording medium. A program for causing a computer to execute a process of selecting data to be edited stored in a storage medium .

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