JP2014093733A - Video distribution device, video reproduction device, video distribution program, and video reproduction program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform reverse reproduction of streaming distributed video without adding additional information to a bit stream.SOLUTION: Provided is a video reproduction device for performing streaming reproduction of video information distributed from a video distribution device according to a distribution request, the video reproduction device comprising: means for transmitting, upon receiving an instruction for reverse reproduction, a distribution request for reverse distribution and reproduction time information to the video distribution device; means for receiving, in order, GOP information and coded data in 1 GOP units distributed according to the distribution request; and means for storing, on the basis of GOP information allowing to discriminate coded data in 1 GOP units, the received coded data in 1 GOP units in a ring buffer classified into current GOP and future GOP in order of past reproduction time, and while shifting the coded data in 1 GOP units stored in the ring buffer to the future direction in GOP units, decoding the coded data in 1 GOP units stored in the current GOP of the ring buffer, thereby reverse-reproducing video information.

Description

  The present invention relates to a video distribution device, a video reproduction device, a video distribution program, and a video reproduction program.

  Conventionally, there has been known a decoding device capable of performing encoding processing on video data and audio data, further multiplexing, streaming distribution of the multiplexed encoded data, and reverse reproduction of the video distributed in streaming. (For example, refer to Patent Document 1). In this decoding apparatus, three entry points (position information of I picture) are recorded in the bit stream in the forward direction and the backward direction, respectively, and the first and second entry points are extracted, and in the reverse direction One of the first or second entry points is accessed, the accessed frame is decoded, and control is performed so that the already decoded image is displayed until the next frame to be displayed is decoded.

Japanese Patent No. 3491365

  However, in the decoding device described in Patent Document 1, three entry points (position information of I picture) in the forward direction and the backward direction must be explicitly included in the bitstream. There is a problem of not becoming. The decoding device described in Patent Document 1 performs reverse playback and reverse frame skip playback of an image stored on a local disk, and performs reverse playback and reverse frame reception while receiving video stream-distributed from a distribution server. There is also a problem that it cannot be applied to feed and replay.

  The present invention has been made in view of such circumstances, and a video distribution apparatus, a video reproduction apparatus, and a video distribution capable of controlling reproduction of streaming distribution video without newly adding additional information to the bitstream. An object is to provide a program and a video reproduction program.

  The present invention relates to a video distribution apparatus that distributes video information in response to a request from a video reproduction apparatus that performs streaming reproduction of received video information, and receiving means that receives the distribution request and reproduction time information from the video reproduction apparatus; The received distribution request is analyzed, and when the distribution request is reverse distribution, an instruction to read out encoded data in the past direction is output in units of 1 GOP from the beginning of the GOP of the reproduction time based on the received reproduction time information. A request content analyzing means that inputs the read instruction, reads the encoded data in the past direction from the head of the GOP of the instructed reproduction time in units of 1 GOP, and identifies the read 1 GOP encoded data Reproduction data storage means for generating information and outputting the generated GOP information and the read encoded data in units of 1 GOP; Serial GOP information and the encoded data of the 1GOP units comprising: a transmitting means for transmitting to the image reproducing device.

  The present invention relates to a video distribution apparatus that distributes video information in response to a request from a video reproduction apparatus that performs streaming reproduction of received video information, and receiving means that receives the distribution request and reproduction time information from the video reproduction apparatus; The received distribution request is analyzed, and when the distribution request is sequential distribution, an instruction to read the encoded data in the future direction is output in units of 1 GOP from the beginning of the GOP of the reproduction time based on the received reproduction time information. A request content analyzing means that inputs the read instruction, reads the encoded data in the future direction in units of 1 GOP from the head of the GOP of the instructed reproduction time, and identifies the read 1 GOP encoded data Reproduction data storage means for generating information and outputting the generated GOP information and the read encoded data in units of 1 GOP; Serial GOP information and the encoded data of the 1GOP units comprising: a transmitting means for transmitting to the image reproducing device.

  The present invention is characterized in that the transmission means transmits the GOP information and the encoded data in units of 1 GOP at an over rate than the distribution rate of the encoded data.

  The present invention is a video reproduction device for streaming reproduction of video information distributed from a video distribution device in response to a distribution request. When a reverse reproduction instruction is received, a reverse distribution distribution request and reproduction time information are provided. Transmission means for transmitting to the video distribution apparatus, reception means for sequentially receiving GOP information distributed in response to the distribution request and encoded data in 1 GOP units, and encoded data in 1 GOP units can be identified Based on the GOP information, the received encoded data in units of 1 GOP is stored in a ring buffer classified into a past GOP, a current GOP, and a future GOP in the order of playback time, and stored in the ring buffer. 1 GOP stored in the current GOP of the ring buffer while shifting the encoded data of 1 GOP unit in the GOP unit in the future direction Characterized by comprising a reproducing means for reverse playback of the video information by decoding the encoded data of the unit.

  The present invention is characterized in that the reproduction time information is determined based on the number of the past GOPs and the presence / absence of the encoded data by checking the presence / absence of the encoded data stored in the ring buffer of the past GOP. And

  The present invention is a video reproduction device for streaming reproduction of video information distributed from a video distribution device in response to a distribution request. When a sequential reproduction instruction is received, a sequential distribution distribution request and reproduction time information are transmitted. Transmission means for transmitting to the video distribution apparatus, reception means for sequentially receiving GOP information distributed in response to the distribution request and encoded data in 1 GOP units, and encoded data in 1 GOP units can be identified Based on the GOP information, the received encoded data in units of 1 GOP is stored in a ring buffer classified into a past GOP, a current GOP, and a future GOP in the order of playback time, and stored in the ring buffer. 1 GOP stored in the current GOP of the ring buffer while shifting the encoded data of 1 GOP unit in the past in GOP units Characterized by comprising a reproducing means for sequentially reproducing the video information by decoding the encoded data of the unit.

  The present invention is characterized in that the reproduction time information is determined based on the number of the future GOP and the presence / absence of the encoded data by checking the presence / absence of the encoded data stored in a ring buffer of the future GOP. And

  The present invention is a video distribution program for causing a computer to function as the video distribution apparatus.

  The present invention is a video playback program for causing a computer to function as the video playback device.

  According to the present invention, it is possible to control the reproduction of streaming distribution video without newly adding additional information to the bitstream.

It is a block diagram which shows the structure of one Embodiment of this invention. It is explanatory drawing which shows the operation | movement of the ring buffer shift of a reproduction | regeneration start. It is explanatory drawing which shows the operation | movement of the ring buffer shift at the time of forward reproduction. It is explanatory drawing which shows the operation | movement of the ring buffer shift at the time of transfer from forward reproduction to reverse reproduction. It is explanatory drawing which shows the operation | movement of the ring buffer shift of reverse reproduction. It is explanatory drawing which shows the processing operation of forward reproduction. It is explanatory drawing which shows the processing operation at the time of transfer from forward reproduction to reverse reproduction. It is explanatory drawing which shows the processing operation | movement of reverse reproduction. It is explanatory drawing which shows the processing operation | movement of reverse reproduction. It is explanatory drawing which shows the processing operation | movement of reverse delivery in the delivery server. It is explanatory drawing which shows the processing operation at the time of transfer from reverse reproduction to forward reproduction. It is explanatory drawing which shows the processing operation of forward reproduction. It is explanatory drawing which shows the processing operation | movement of the sequential delivery in the delivery server 2. FIG. It is explanatory drawing which shows the processing operation | movement of the ring buffer shift of jump reproduction | regeneration. It is explanatory drawing which shows the processing operation | movement of the ring buffer shift of jump reproduction | regeneration. It is explanatory drawing which shows a video reproduction | regeneration direction. 3 is a diagram illustrating a configuration of an operation unit 15. FIG.

  Hereinafter, a video distribution apparatus and a video reproduction apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the embodiment. In this figure, reference numeral 1 denotes a playback terminal that functions as a video playback device. Reference numeral 2 denotes a distribution server that functions as a video distribution apparatus. Reference numeral 3 denotes a network that connects the playback terminal 1 and the distribution server 2 so that information communication is possible.

  The playback terminal 1 includes a transmission unit 11, a reception unit 12, a bidirectional buffer control unit 13, a video output unit 14, an operation unit 15, a decoding unit 16, a decoder unit 17, a decoded image control unit 18, and a decoded image buffer unit 19. . The transmission unit 11 transmits to the distribution server 2 a reverse distribution request or a forward distribution request and reproduction time information indicating where the distribution server distributes from the reproduction time. The receiving unit 12 receives video information distributed from the distribution server 2.

  The bi-directional buffer control unit 13 sends a reverse delivery request or forward delivery request and reproduction time information indicating where the distribution server 2 should deliver from the reproduction time to the transmission unit 11. In addition, the bidirectional buffer control unit 13 receives GOP (Group Of Picture) information distributed from the distribution server 2 and 1 GOP encoded data in this order. In addition, the bidirectional buffer control unit 13 manages encoded data in units of 1 GOP based on GOP information, and creates a ring buffer composed of a plurality of GOPs arranged in order of reproduction time. Further, the bidirectional buffer control unit 13 sends the encoded data of the ring buffer to the decoder unit 17.

  The video output unit 14 includes a display device that displays video and a speaker that emits audio in order to reproduce the video and audio distributed from the distribution server 2. The operation unit 15 performs an operation for the video viewer to view the video. The operation unit 15 performs forward playback, forward frame advance playback, reverse playback, and reverse frame forward playback by operations such as pressing a button. As shown in FIG. 16, forward playback is playback from the current playback time toward the future. On the other hand, reverse playback is playback from the current playback direction toward the past. FIG. 16 is an explanatory diagram showing the video playback direction.

  The reproduction operation includes the following operations. (1) Each time a reverse frame advance button is pressed, reverse frame playback is performed frame by frame. (2) When the reverse playback button is pressed once, playback is continuously performed in units of one frame (15 frames / sec) toward the past playback time. (3) Slow playback (slower than 15 frames / sec) is played back in units of one frame toward the past playback time by pressing the reverse slow playback button once. (4) Each time the forward frame advance button is pressed, the forward frame is reproduced frame by frame. (5) When the forward playback button is pressed once, playback is continued in units of one frame (15 frames / sec) toward the future of the playback time. (6) Slow playback (slower than 15 frames / sec) is played back in units of one frame toward the future of the playback time when the forward slow playback button is pressed once. In addition, the operation unit 15 notifies the bidirectional buffer control unit 13 and the decoded image control unit 18 of an instruction for performing reverse reproduction or forward reproduction. FIG. 17 shows an example of each operation button of the operation unit 15.

  The decoding unit 16 decodes the encoded data received by the receiving unit 12. The decoder unit 17 has a buffer capacity capable of temporarily storing at least 1 GOP decoded video / audio, decodes encoded data received from the ring buffer in units of 1 GOP, and decodes the decoded video / audio to the decoded image buffer unit 19. Send audio. The decoded image control unit 18 controls the decoded image. The decoded image buffer unit 19 has a capacity (1 GOP + X frame) larger than 1 GOP to prevent the buffer from overflowing, and sends video / audio to the video output unit 14 in the forward playback direction or the reverse playback direction to output the video. The video / audio is not deleted immediately after transmission to the unit 14. The video output unit 14 reproduces the video / audio received from the decode buffer unit 19. Moreover, it is not always necessary to reproduce the sound.

  The distribution server 2 includes a reception unit 21, a request content analysis unit 22, a reproduction data storage unit 23, and a transmission unit 24. The receiving unit 21 receives a request from the playback terminal 1 and sends it to the request content analyzing unit 22. The request content analysis unit 22 analyzes the request content and, when the request is reverse delivery, the encoded data is transmitted in the past direction of the reproduction time in units of 1 GOP from the top of the GOP of the reproduction time requested to the reproduction data storage unit 23. A read instruction is issued. Further, the request content analysis unit 22 analyzes the request content, and when the request is forward delivery, the reproduction data storage unit 23 instructs the reproduction data storage unit 23 to read out the encoded data from the beginning of the GOP of the reproduction time requested to the future. put out.

  When receiving the reverse delivery instruction from the request content analysis unit 22, the reproduction data storage unit 23 reads the encoded data in the past direction of the reproduction time in units of 1 GOP from the beginning of the GOP of the reproduction time requested for distribution. GOP information including information such as the playback time of 1 GOP is created and sent to the transmission unit 24 in the order of GOP information and 1 GOP encoded data. Also, upon receiving an order delivery instruction from the request content analysis unit 22, the reproduction data storage unit 23 reads the encoded data in the future direction of the reproduction time in units of 1 GOP from the beginning of the GOP of the reproduction time requested for distribution, Further, GOP information containing information such as reproduction time is created for each GOP, and the GOP information and 1 GOP encoded data are sent to the transmission unit in this order.

  The transmission unit 24 distributes the GOP information and the 1GOP encoded data in an overrate manner to the requesting playback terminal 1 in accordance with the distribution rate of the encoded data. Since the distribution flow control is performed between the transmission unit 24 of the distribution server 2 and the reception unit 12 of the reproduction terminal 1, the buffer of the bidirectional buffer control unit 13 of the reproduction terminal 1 does not overflow even in the case of overrate distribution. . Here, 1 GOP is 0.5 seconds and 15 frames / sec, but this is not a limitation.

  Next, with reference to FIG. 2, the operation of the ring buffer shift for starting reproduction will be described. FIG. 2 is an explanatory diagram showing a ring buffer shift operation for starting reproduction. The bidirectional buffer control unit 13 manages encoded data by GOP and creates a ring buffer composed of a plurality of GOPs. Ring buffer creation is determined by the number of GOPs in the ring buffer. The ring buffer is classified as past GOP (hereinafter referred to as past), current GOP (hereinafter referred to as current), and future GOP (hereinafter referred to as future), and a GOP whose playback time has returned from the current playback time is played back from the past or current playback time. The GOP where time has advanced is assumed to be the future. There is not necessarily one at the present, one at the past, and one at the future, but may be plural. The past and future numbers may not be the same.

  Here, it is assumed that the ring buffer is composed of five GOPs of the past 2, the present 1, and the future 2. At the start of reproduction, the received encoded data is put in the current position, and the current encoded data is transmitted to the decoder unit 17. First, at the start of reproduction, the encoded data (0-0.5 seconds) is inserted into the current A1 (FIG. 2 (1)), and the encoded data of the current A1 is transmitted to the decoder unit 17. The playback is started in order (from 0 seconds). Next, when all the encoded data (0-0.5 seconds) of the current A1 is completely transmitted to the decoder unit 17, the GOP is shifted by 1 GOP to the past. The encoded data (0.5-1.0 seconds) is put in the current A2 (FIG. 2 (2)), and the encoded data (0.5-1.0 seconds) of the current A2 is transmitted to the decoder unit 17.

  Next, referring to FIG. 3, the operation of the ring buffer shift for forward reproduction will be described. FIG. 3 is an explanatory diagram showing the ring buffer shift operation during forward playback. First, when transmission of all the current A2 encoded data (0.5 to 1.0 seconds) to the decoder unit 17 is completed, a 1 GOP shift is performed to the past. The encoded data (1.0-1.5 seconds) is entered in the current A3 (FIG. 3 (1)), and the encoded data (1.0-1.5 seconds) of the current A3 is transmitted to the decoder unit 17.

  Next, when transmission of all the current A3 encoded data (1.0-1.5 seconds) to the decoder unit 17 is completed, the data is shifted by 1 GOP to the past. Since there are two past GOPs, A1 (0-0.5 seconds) is deleted when one shifts to the past. The encoded data (1.5-2.0 seconds) is put into A4 (FIG. 3 (2)), and the A4 current encoded data (1.5-2.0 seconds) is transmitted to the decoder unit 17.

  Next, with reference to FIG. 4, the operation of the ring buffer shift when shifting from forward playback to reverse playback will be described. FIG. 4 is an explanatory diagram showing the ring buffer shift operation when shifting from forward playback to reverse playback. First, it is assumed that forward reproduction is continuously performed and reverse reproduction is requested at the current time A10 (4.5-5.0 seconds) of the ring buffer (FIG. 4 (1)). Although the past is 2GOP, the presence or absence of encoded data is confirmed in the past 2GOP. In this example, since 2GOP contains encoded data, the current A10 4.5 seconds to 3GOP past 3.0 seconds (reproduction) Request reverse delivery from time information). The presence / absence of encoded data included in the past GOP is confirmed, and reproduction time information is determined based on the number of past GOPs and the presence / absence of encoded data.

  Next, when transmission of all the encoded data (4.5-5.0 seconds) of the current A10 to the decoder unit 17 is completed, the current A10 (4.5-5.0 seconds) is set to the future, and the past A9 (4. 0-4.5) currently shifts past A8 (3.5-4.0) by 1 GOP to the past. Then, the encoded data (3.0-3.5 seconds) received by reverse delivery is put in the past C1 (FIG. 4 (2)), and the encoded data (4.0-4.5) of the current A9 is decoded. To the unit 17.

  Next, the reverse reproduction ring buffer shift operation will be described with reference to FIG. FIG. 5 is an explanatory diagram showing the ring buffer shift operation for reverse reproduction. First, when all the encoded data (4.0-4.5 seconds) of the current A9 is transmitted to the decoder unit 17, the current A9 (4.0-4.5 seconds) is set to the future, and the past A8 (3.5 -4.0) to the right, the past C1 (3.0 to 3.5 seconds) to the past, and the future A10 (4.5 to 5.0 seconds) to the future by 1 GOP. Then, the encoded data (2.5-3.0 seconds) received by reverse delivery is put in the past C2 (FIG. 5 (1)), and the current A8 encoded data (3.5-4.0 seconds) is stored. The data is transmitted to the decoder unit 17.

  Next, when transmission of all the current encoded data A8 (3.5-4.0 seconds) to the decoder unit 17 is completed, the current A8 (3.5-4.0 seconds) is set to the future, and the past C1 (3. 0 to 3.5 seconds), the past C2 (2.5 to 3.0 seconds) to the past, and the future A9 (4.0 to 4.5 seconds) to the future. Since there are two future GOPs, A10 (4.5-5.0 seconds) is deleted when shifting to the future. Subsequently, the encoded data (2.0 to 2.5 seconds) received by reverse delivery is put in the past C3 (FIG. 5 (2)), and the encoded data of the current C1 (3.0 to 3.5 seconds). Is transmitted to the decoder unit 17.

  Next, with reference to FIG. 6, the processing operation for forward reproduction will be described. FIG. 6 is an explanatory diagram showing the processing operation for forward playback. Here, it is assumed that the ring buffer includes three GOPs of the past GOP1, the current GOP1, and the future GOP1. First, the bidirectional buffer control unit 13 sends the current A10 (4.5-5.0 seconds) of the ring buffer to the decoder unit 17 ((1) in FIG. 6). Next, the decoder unit 17 receives and decodes the encoded data of the current A10 (4.5-5.0 seconds), and sends the decoded video / audio to the decoded image buffer unit 19 ((2) in FIG. 6). .

  Next, the decoded image buffer unit 19 receives the video / audio from the first 4.5 seconds of A10 from the decoder unit 17 while deleting the video / audio A9 that has already been sent to the video output unit. Then, the decoded image buffer unit 19 sends the video / audio to the video output unit 14 in the forward direction of the reproduction time. The video / audio transmitted to the video output unit 14 is not immediately deleted ((3) in FIG. 6). Next, the video output unit 14 reproduces the video / audio received from the decoded image buffer unit 19 ((4) in FIG. 6). Audio does not necessarily have to be played back.

  Next, with reference to FIG. 7, a processing operation for shifting from forward reproduction (processing operation shown in FIG. 6) to reverse reproduction will be described. FIG. 7 is an explanatory diagram showing a processing operation when shifting from forward playback to reverse playback. When the reverse frame advance button is pressed from the forward reproduction, the operation unit 15 notifies the bidirectional buffer control unit 13 and the decoded image control unit 18 of the reverse reproduction instruction (FIG. 7 (1)). When receiving the reverse playback instruction from the operation unit 15, the decoded image control unit 18 sends an instruction to the decoder unit 17 to stop the transmission of video / audio to the decoded image buffer unit 19 ((2) in FIG. 7). In response, one decoded image buffer unit is added. The decoded image buffer unit used in the forward reproduction is referred to as a decoded image buffer unit 19-A, and the newly added decoded image buffer unit is referred to as a decoded image buffer unit 19-B.

  Next, when the bi-directional buffer control unit 13 receives an instruction for reverse reproduction from the operation unit 15, the reverse distribution request and the ring buffer of the reproduction time information (FIG. 6) indicating where the distribution server 2 should distribute from the reproduction time. The XGOP past (here, the past encoded data is one and the past A9 exists, so the reproduction time is 3.5 seconds) from the current A10 (4.5-5.0 seconds) is sent to the transmission unit 11 (FIG. 7 (3)). If the past is 2GOP and there is encoded data for both 2GOPs, the time information is 3.0 seconds. The presence / absence of encoded data included in the past GOP is confirmed, and reproduction time information is determined based on the number of past GOPs and the presence / absence of encoded data. In addition, the bidirectional buffer control unit 13 deletes encoded data other than the ring buffer. And the transmission part 11 sends a reverse delivery request | requirement and reproduction | regeneration time information (3.5 second) to the delivery server 2 (FIG. 7 (4)). The reverse delivery request and the reproduction time information are sent to the delivery server 2 only once for the first time.

  Next, when receiving the reverse frame playback request from the decoded image control unit 18, the decoded image buffer unit 19-A lastly sends the forward output to the video output unit 14 in accordance with the timing (for example, 4.8 seconds). Then, video / audio is sent to the video output unit 14 frame by frame in the direction of the past playback time (FIG. 7 (5)). In the case of a reverse playback request, video / audio is sent to the video output unit 14 continuously in the past playback time direction in units of one frame.

  Next, the video output unit 14 reproduces the video / audio received from the decoded image buffer unit 19-A (FIG. 7 (6)). Even if the playback is reversed from the forward playback, the reverse frame playback is performed for each frame without skipping the playback time from the forward playback time (4.8 seconds). Audio does not necessarily have to be played back.

  Next, while reproducing the decoded image buffer unit 19-A, the decoded image control unit 18 instructs the decoder unit 17 to delete the decoded video / audio remaining in the decoder unit 17 (FIG. 7 (7)). Further, an instruction to send the next decoded video / audio is sent to another decoded image buffer unit 19-B.

  Next, while playing back the decoded image buffer unit 19-A, the bidirectional buffer control unit 13 receives the encoded data that has been reversely distributed, shifted A10 to the future, and A9 to the present, and reversely distributed. The encoded data (3.5-4.0 seconds) is entered in the past C1. The bidirectional buffer control unit 13 receives the GOP information and manages the encoded data in units of 1 GOP ((8) in FIG. 7). Then, the bidirectional buffer control unit 13 sends the encoded data (4.0-4.5 seconds) of the current A9 in the ring buffer to the decoder unit 17 ((9) in FIG. 7). In response, the decoder unit 17 receives and decodes the encoded data of A9 (4.0-4.5 seconds) (FIG. 7 (10)). The decoded video / audio is sent to the decoded image buffer unit 19-B.

  Next, when the decoded image control unit 18 receives the reverse frame reproduction request from the operation unit 15 after the reproduction of the decoded image buffer unit 19-A is finished, the reproduction time is decoded every frame according to the timing. An instruction to send the video / audio to the video output unit 14 is given to the decoded image buffer unit 19-B from the continuation of the playback time of the buffer unit 19-A (4.3 seconds) toward the past playback time direction ( FIG. 7 (11)). In the case of a reverse playback request, an instruction to send video / audio to the video output unit 14 is issued continuously in units of one frame in the past playback time direction.

  Next, when the decoded image buffer unit 19-B receives the reverse frame reproduction request from the decoded image control unit 18, the decoded image buffer unit 19-A reproduces the decoded image buffer unit 19-A for each frame in accordance with the timing. Video / audio is sent to the video output unit 14 from the continuation of time (4.3 seconds) toward the past playback time direction (FIG. 7 (12)). In the case of a reverse playback request, video / audio is sent to the video output unit 14 continuously in the past playback time direction in units of one frame.

  Next, the video output unit 14 reproduces the video / audio received from the decoded image buffer unit 19-B (FIG. 7 (13)). Even if the playback is in the reverse direction, the playback time is not skipped from the time of forward playback (4.3 seconds), and reverse frame-by-frame playback is performed frame by frame from forward playback. In the case of a reverse playback request, playback is performed continuously in the past playback time direction in units of one frame. Audio does not necessarily have to be played back.

  Next, with reference to FIG. 8, the reverse playback processing operation following the processing operation shown in FIG. 7 will be described. FIG. 8 is an explanatory diagram showing the processing operation of reverse playback. The decoded image control unit 18 instructs the decoder unit 17 to send the next decoded video / audio to the decoded image buffer unit 19-A while reproducing the decoded image buffer unit 19-B. Then, an instruction to delete the video / audio of the decoded image buffer unit 19-A is sent ((1) in FIG. 8).

  Next, when the bi-directional buffer control unit 13 finishes sending all the encoded data of the current A9 of the ring buffer (FIG. 7) to the decoder unit 17, the ring buffer A9 is shifted to the future and C1 is shifted to the present, and is reversely distributed. The encoded data (3.0-3.5 seconds) is put into C2. The bidirectional buffer control unit 13 receives the GOP information and manages the encoded data in units of 1 GOP ((2) in FIG. 8).

  Next, the bidirectional buffer control unit 13 sends the encoded data (3.5-4.0 seconds) of the current C1 in the ring buffer to the decoder unit 17 ((3) in FIG. 8). In response to this, the decoder unit 17 receives and decodes the encoded data C1 (3.5-4.0 seconds). The decoded video / audio is sent to the decoded image buffer unit 19-A (FIG. 8 (4)).

  Next, when the decoding of the decoded image buffer unit 19-B is finished, the decoded image control unit 18 receives a reverse frame reproduction request from the operation unit 15, and in the past reproduction time direction every frame in accordance with the timing. An instruction to send video / audio to the video output unit 14 is sent to the decoded image buffer unit 19-A (FIG. 8 (5)). In the case of a reverse playback request, an instruction to send video / audio to the video output unit 14 is issued continuously in units of one frame in the past playback time direction.

  Next, when receiving the reverse frame playback request from the decoded image control unit 18, the decoded image buffer unit 19-A outputs video / audio to the past playback time direction for each frame in accordance with the timing. 14 That is, every time the reverse frame advance button is pressed on the operation unit 15, reverse frame reproduction is performed for each frame ((6) in FIG. 8). In the case of a reverse playback request, video / audio is sent to the video output unit 14 continuously in the past playback time direction in units of one frame.

  Next, the video output unit 14 reproduces the video / audio received from the decoded image buffer unit 19-A (FIG. 8 (7)). In the case of a reverse playback request, playback is performed continuously in the past playback time direction in units of one frame. Audio does not necessarily have to be played back.

  Next, with reference to FIG. 9, the reverse playback processing operation following the processing operation shown in FIG. 8 will be described. FIG. 9 is an explanatory diagram showing a reverse playback processing operation. The decoded image control unit 18 instructs the decoder unit 17 to send the next decoded image to the decoded image buffer unit 19-B while reproducing the video of the decoded image buffer unit 19-A. An instruction to delete the video / audio in the decoded image buffer unit 19-B is sent (FIG. 9 (1)).

  Next, when the bi-directional buffer control unit 13 finishes sending the current C1 encoded data (FIG. 8) to the decoder unit 17, the C1 is shifted to the future and the C2 is shifted to the present, and the reversely distributed encoded data (2. 5-3.0 seconds) into C3. The bidirectional buffer control unit 13 receives the GOP information and manages the encoded data in units of 1 GOP ((2) in FIG. 9).

  Next, the bidirectional buffer control unit 13 sends the C2 current encoded data (3.0 to 3.5 seconds) of the ring buffer to the decoder unit 17 ((3) in FIG. 9). In response to this, the decoder unit 17 receives and decodes the encoded data C2 (3.0 to 3.5 seconds). Then, the decoded video / audio is sent to the decoded image buffer unit 19-B (FIG. 9 (4)).

  Next, when the decoded image buffer unit 19-A finishes reproduction, the decoded image control unit 18 receives a reverse frame reproduction request from the operation unit 15, and in the past reproduction time direction for each frame according to the timing. An instruction to send video / audio to the video output unit 14 is issued to the decoded image buffer unit 19-B (FIG. 9 (5)). In the case of a reverse playback request, an instruction to send video / audio to the video output unit 14 is issued continuously in units of one frame in the past playback time direction.

  Next, when the decoded image buffer unit 19-B receives the reverse frame playback request from the decoded image control unit 18, the video output unit 14 outputs video / audio in the past playback time direction for each frame in accordance with the timing. Send to. That is, every time the reverse frame advance button is pressed on the operation unit 15, reverse frame reproduction is performed frame by frame (FIG. 9 (6)). In the case of a reverse playback request, video / audio is sent to the video output unit 14 continuously in the past playback time direction in units of one frame.

  Next, the video output unit 14 reproduces the video / audio received from the decoded image buffer unit 19-B (FIG. 9 (7)). In the case of a reverse playback request, playback is performed continuously in the past playback time direction in units of one frame. Audio does not necessarily have to be played back.

  Next, the reverse delivery processing operation in the delivery server 2 will be described with reference to FIG. FIG. 10 is an explanatory diagram showing a reverse delivery processing operation. First, the receiving unit 21 receives a request from the playback terminal 1 and sends it to the request content analyzing unit 22 (FIG. 10 (1)). When the request content analysis unit 22 analyzes the request content and receives a reverse delivery request, the request content analysis unit 22 encodes the playback time back in the past in units of 1 GOP from the beginning of the GOP of the playback time requested to the playback data storage unit 23. Is instructed to read (FIG. 10 (2)).

  Next, when the reproduction data storage unit 23 receives the reverse distribution instruction from the request content analysis unit 22, the reproduction data storage unit 23 starts 1 GOP from the beginning (3.5 seconds) of the GOP of the reproduction time requested for distribution (eg, 3.5 seconds). Read the encoded data. Next, 1 GOP encoded data is read from the head (3.0 seconds) of the GOP that is backed by 1 GOP from the currently read GOP (FIG. 10 (3)). In this way, the encoded data is read in the past direction in units of 1 GOP. Further, the reproduction data storage unit 23 creates GOP information including information such as the reproduction time of this GOP before transmitting 1 GOP encoded data to the transmission unit 24, and GOP information (denoted as information in FIG. 10). 1 GOP encoded data is sent to the transmission unit 24 in the order.

  Next, the transmission unit 24 distributes the GOP information and 1 GOP encoded data to the requesting playback terminal 1 at an over-rate from the encoded data distribution rate (FIG. 10 (4)). The encoded data may be only multiplexed data obtained by performing compression processing on moving image data and audio data, or moving image data obtained by performing compression processing. Then, reverse distribution is performed until the distribution server 2 receives a forward distribution request from the reproduction terminal 1.

  In addition, when jumping to another playback time during playback and playing back, if the jump destination is 9.3 seconds, the playback time information requested for distribution is 9.3 seconds, and the playback data storage unit 23 The encoded data is read from the head (9.0 seconds) of this GOP.

  Next, a processing operation for shifting from reverse reproduction to forward reproduction will be described with reference to FIG. FIG. 11 is an explanatory diagram showing a processing operation for shifting from reverse reproduction to forward reproduction. Here, it is assumed that the ring buffer includes three GOPs of the past GOP1, the current GOP1, and the future GOP1. First, when the forward frame advance button is pressed from reverse playback, the operation unit 15 notifies the bidirectional buffer control unit 13 and the decoded image control unit 18 of an instruction to perform forward playback (FIG. 11 (1)).

  Next, when the decoded image control unit 18 receives forward reproduction from the operation unit 15, the decoded image control unit 18 sends an instruction to the decoder unit 17 to stop transmission of video / audio to the decoded image buffer unit 19-B used for reverse reproduction. (FIG. 11 (2)). Further, the decoded image buffer unit 19-B (in the case of the decoded image buffer unit 19-A) is different from the decoded image buffer unit 19-B (which may be the decoded image buffer unit 19-A) used in the reverse reproduction. The name change is notified to the decoded image buffer unit 19. Further, the decoded image buffer unit 19-A is deleted. In the case of sequential playback, the decoded image buffer unit 19 is set to one.

  Next, when receiving the forward playback from the operation unit 15, the bidirectional buffer control unit 13 receives the forward delivery request and the playback time information indicating where the delivery server 2 should deliver from the playback time (current C2 of the ring buffer in FIG. 11). 3.0 to 3.5 seconds) to the XGOP future (here, reproduction time: 4.0 seconds since the future encoded data C1 exists) is sent to the transmission unit 11 ((3) in FIG. 11). When the future is 2GOP and there is encoded data for both 2GOP, the time information is 4.5 seconds. The presence / absence of encoded data contained in the future GOP is confirmed, and reproduction time information is determined based on the number of future GOPs and the presence / absence of encoded data. In addition, the bidirectional buffer control unit 13 deletes encoded data other than the ring buffer.

  Next, the transmission unit 11 sends a sequential distribution request and reproduction time information (4.0 seconds) to the distribution server 2 (FIG. 11 (4)). The forward distribution request and the reproduction time information are sent to the distribution server 2 only once for the first time.

  Next, when the decoded image control unit 18 receives a forward frame reproduction request from the operation unit 15 to the decoded image buffer unit 19 used in reverse reproduction, the decoded image control unit 18 finally outputs video in reverse reproduction according to the timing. An instruction to send video / audio to the video output unit 14 in the future reproduction time direction is issued every frame from the time (for example, 3.2 seconds) sent to the unit 14 (FIG. 11 (5)). In the case of a forward reproduction request, an instruction to send video / audio to the video output unit 14 is issued continuously in units of one frame toward the future reproduction time direction.

  Next, when receiving the forward frame playback request from the decoded image control unit 18, the decoded image buffer unit 19 starts from the time (3.2 seconds) last sent to the video output unit 14 by reverse playback in accordance with the timing. Video / audio is sent to the video output unit 14 in the future reproduction time direction for each frame (FIG. 11 (6)). Even if the playback direction is reversed, the playback time does not skip and the frames are played back in order for each frame. In the case of a forward playback request, video / audio is sent to the video output unit 14 continuously in the direction of the future playback time in units of one frame.

  Next, the video output unit 14 reproduces the video / audio received from the decoded image buffer unit 19 (FIG. 11 (7)). In the case of a forward playback request, playback is performed continuously in the future playback time direction in units of one frame. Audio does not necessarily have to be played back.

  Next, with reference to FIG. 12, a processing operation for shifting from reverse playback to forward playback following the processing operation shown in FIG. 11 will be described. FIG. 12 is an explanatory diagram showing a processing operation for shifting from reverse playback to forward playback. First, while reproducing the video of the decoded image buffer unit 19, when the bidirectional buffer control unit 13 finishes sending all the encoded data (FIG. 11) of the current C2 from the ring buffer to the decoder unit 17, the bidirectional buffer control unit 13 C3 is deleted, C2 is shifted to the past, C1 is shifted to the present, and the encoded data (4.0-4.5 seconds) distributed in order is put into B1. The bidirectional buffer control unit 13 receives the GOP information and manages the encoded data in units of 1 GOP (FIG. 12 (1)).

  Next, the bidirectional buffer control unit 13 sends the encoded data (3.5-4.0 seconds) of the current C1 in the ring buffer to the decoder unit 17 ((2) in FIG. 12). In response to this, the decoder unit 17 receives and decodes the encoded data of C1 (3.5-4.0 seconds). The decoded video / audio is sent to the decoded image buffer unit 19 (FIG. 12 (3)).

  Next, the decoded image buffer unit 19 receives the video / audio from the first 3.5 seconds of C1 from the decoder unit 17 while deleting the reproduced video / audio C2. When a forward frame playback request is received from the decoded image control unit 18, video / audio is sent to the video output unit 14 in the future playback time direction frame by frame in accordance with the timing (FIG. 12 (4)). That is, every time the forward frame advance button is pressed on the operation unit 15, the forward frame reproduction is performed for each frame. In the case of a forward playback request, video / audio is sent to the video output unit 14 continuously in the direction of the future playback time in units of one frame.

  Next, the video output unit 14 reproduces the video / audio received from the decoded image buffer unit 19 (FIG. 12 (5)). In the case of a forward playback request, playback is performed continuously in the future playback time direction in units of one frame. Audio does not necessarily have to be played back.

  Next, with reference to FIG. 13, the processing operation of the sequential distribution in the distribution server 2 will be described. FIG. 13 is an explanatory diagram showing a processing operation of sequential distribution in the distribution server 2. First, the receiving unit 21 receives a request from the playback terminal 1 and sends it to the request content analyzing unit 22 (FIG. 13 (1)). When the request content analysis unit 22 analyzes the request content and receives the sequential delivery request, the request content analysis unit 22 encodes the playback time toward the future in units of 1 GOP from the beginning of the GOP of the playback time requested to the playback data storage unit 23. Is instructed to read (FIG. 13 (2)).

  Next, when the reproduction data storage unit 23 receives an order distribution instruction from the request content analysis unit 22, the reproduction data storage unit 23 encodes the code from the beginning (4.0 seconds) of the GOP of the reproduction time requested for distribution (eg, 4.0 seconds). Read data. Subsequently, the reproduction data storage unit 23 creates GOP information including information such as the reproduction time of 1 GOP, and sends it to the transmission unit 24 in the order of GOP information and 1 GOP encoded data ((3) in FIG. 13).

  Next, the transmission unit 24 distributes the GOP information and the 1GOP encoded data to the requesting playback terminal 1 at an over-rate from the encoded data distribution rate (FIG. 13 (4)). The encoded data may be only multiplexed data obtained by performing compression processing on moving image data and audio data, or moving image data obtained by performing compression processing. Thus, the distribution is in order until the distribution server 2 receives the reverse distribution request from the reproduction terminal 1.

  In addition, when jumping to another playback time during playback and playing back, if the jump destination is 9.3 seconds, the playback time information requested for distribution is 9.3 seconds, and the playback data storage unit 23 The encoded data is read from the head (9.0 seconds) of this GOP.

  Next, with reference to FIG. 14, the processing operation of the jump buffer ring buffer shift will be described. FIG. 14 is an explanatory diagram showing a ring buffer shift processing operation for jump reproduction. FIG. 14 shows an example in which jump playback is performed during forward playback, and reverse playback is started immediately after jump playback. Jump playback is playback from the playback time currently being viewed to the past or future, and the playback terminal 1 sends the playback time information of the jump destination to the distribution server 2. When a jump reproduction request is made, only reproduction time information is sent to the distribution server 2, and reverse distribution or forward distribution is continued as it is. As shown in FIG. 17, the operation unit 15 performs jump playback and playback by clicking with a mouse or the like in the past or future direction from the playback time currently displayed on the seek bar that displays the progress of playback on the operation unit 15. to understand. The operation unit 15 notifies the bidirectional buffer control unit 13 and the decoded image control unit 18 of jump reproduction and reproduction time information. In addition, the operation unit 15 sends the playback time information of the jump destination to the transmission unit 11. The transmission unit 11 sends the reproduction time information of the jump destination to the distribution server 2. When the receiving unit 21 receives the reproduction time information from the transmission unit 11, and the request analysis unit 22 receives the reproduction time information from the reception unit 21, the request analysis unit 22 sends the requested reproduction time information to the reproduction data storage unit 23 from the top of the GOP of the requested reproduction time information. Give instructions to read. The reproduction data storage unit 23 continues reverse distribution or forward distribution, and after reading out the currently read GOP, from the beginning of the GOP at the requested reproduction time toward the past direction or the future direction. read out. The method for reading the encoded data, GOP information creation, GOP information, distribution of the encoded data, and reception method are the same. In the case of jump reproduction, all the encoded data of the bidirectional buffer control unit 13 are once deleted. Here, it is assumed that the ring buffer includes five GOPs of the past GOP2, the current GOP1, and the future GOP2. When receiving the jump reproduction, the decoded image control unit 18 instructs the decoded image buffer unit 19 to stop transmission of the video / audio to the video output unit 14 and to delete the video / audio from the decoded image buffer unit 19. Also, the decoder unit 17 is instructed to the decoded image buffer unit 19 to stop transmission of video / audio and to delete video / audio remaining in the decoder unit 17.

  When the bidirectional buffer control unit 13 receives the encoded data of the jump destination playback time, it enters the encoded data of the jump destination (9.0 to 9.5 seconds) into the current A1 (FIG. 14 (1)). The encoded data of current A1 is transmitted to the decoder unit 17. When reverse playback is requested when the encoded data at the jump destination is currently A1 (9.0 to 9.5 seconds), the past is 2 GOP. In this example, the presence or absence of encoded data is confirmed in the past 2 GOP. Since both 2GOPs are empty, reverse delivery is requested from 9.0 seconds of the current A1 to 8.5 seconds (playback time information) 1 GOP past. The presence / absence of encoded data included in the past GOP is confirmed, and reproduction time information is determined based on the number of past GOPs and the presence / absence of encoded data.

  When transmission of all the encoded data (9.0 to 9.5 seconds) of the current A1 to the decoder unit 17 is completed, the data is shifted to the future and encoded data for reverse delivery (8.5 to 9.0 seconds) Is stored in C1 (FIG. 14 (2)), and the encoded data (8.5-9.0 seconds) of the current C1 is transmitted to the decoder unit 17. The decoder unit 17 sends the decoded C1 video / audio to another newly added decoded image buffer unit 19-B. Since reverse playback is the same as the processing operation shown in FIGS. 4, 5, and 7 to 10, detailed description thereof is omitted here. In the ring buffer shift, reverse-distributed encoded data is put into the current GOP while shifting by 1 GOP in the future direction. The bidirectional buffer control unit 13 receives GOP information and manages encoded data in units of 1 GOP.

  Next, with reference to FIG. 15, the processing operation of the jump buffer ring buffer shift will be described. FIG. 15 is an explanatory diagram illustrating the ring buffer shift processing operation for jump reproduction. FIG. 15 shows an example in which jump playback is performed during reverse playback and transition to forward playback is performed immediately after jump playback.

  When receiving the jump playback, the decoded image control unit 18 transmits the video / audio to the video output unit 14 to the decoded image buffer unit 19-A (which may be 19-B) currently used in reverse playback. Instruct to stop and delete video / audio. Also, the decoder unit 17 stops the transmission of video / audio to the decoded image buffer unit 19-A (which may be 19-B) currently used in reverse reproduction and the video / audio remaining in the decoder unit 17 Give instructions to delete audio.

  When the bi-directional buffer control unit 13 receives the encoded data of the jump destination reproduction time, the bi-directional buffer control unit 13 puts the encoded data (4.0-4.5 seconds) of the jump destination into the current A1 (FIG. 15 (1)). The encoded data of current A1 is transmitted to the decoder unit 17. When forward playback is requested at the time of the jump destination encoded data currently A1 (4.0-4.5 seconds), the future is 2GOP, but the future 2GOP is checked for the presence of encoded data. Since both 2GOPs are empty, a request for forward delivery from the current A1 4.0 seconds to 1GOP future 4.5 seconds (reproduction time information) is requested. The presence / absence of encoded data contained in the future GOP is confirmed, and reproduction time information is determined based on the number of future GOPs and the presence / absence of encoded data.

  When transmission of all the current A1 encoded data (4.0-4.5 seconds) to the decoder unit 17 is completed, the data is shifted by one to the past, and sequentially distributed encoded data (4.5-5.0 seconds). Is stored in B1 (FIG. 15 (2)), and the encoded data (4.5-5.0 seconds) of the current B1 is transmitted to the decoder unit 17. The decoder unit 17 sends the decoded video / audio to the decoded image buffer unit 19-A (which may be 19-B) that is currently used for reverse playback. The decoded image buffer unit 19-A (which may be 19-B) currently used in reverse reproduction is left, and one of the decoded image buffer units 19-A or 19-B is deleted. In the case of sequential playback, the decoded image buffer unit 19 is set to one. Since the forward reproduction is the same as the processing operation shown in FIGS. 2, 3, 6, 11, 12, and 13, detailed description thereof is omitted here. In the ring buffer shift, encoded data for forward delivery is put into the current GOP while shifting by 1 GOP in the past direction.

  As described above, the playback terminal 1 sends the playback time information to the delivery server 2 in order to perform reverse playback, reverse playback, and reverse frame advance playback without interruption while receiving encoded data by stream delivery. In the case of a reverse distribution request, the distribution server 2 distributes the GOP information in the order of GOP information and 1 GOP encoded data from the GOP for the requested reproduction time in the GOP unit in the past reproduction direction. To do. The playback terminal 1 receives the GOP information distributed from the distribution server 2 in the order of 1 GOP encoded data. The bidirectional buffer control unit 13 receives GOP information and manages encoded data in units of 1 GOP. At least three GOPs are managed as a ring buffer in order from the past of the playback time, and 3 GOPs are classified as past GOP, current GOP, and future GOP in order of playback time. The encoded data requested for reverse delivery is put in the ring buffer, 1 GOP encoded data of the current GOP in the ring buffer is decoded, at least two decoded image buffers are prepared, and these decoded image buffers are controlled and reproduced in the reverse direction. . In the case of reverse reproduction, the presence / absence of encoded data included in the past GOP is confirmed, and reproduction time information indicating where the distribution server 2 should perform distribution is determined based on the number of past GOPs and the presence / absence of encoded data. .

  Also, in order to perform forward playback, forward playback, and forward frame advance playback without interrupting playback while receiving encoded data by stream delivery, the playback terminal 1 gives playback time information to the delivery server 2 in order. In the case of a sequential distribution request, the distribution server 2 distributes GOP information and 1 GOP encoded data from the GOP for the requested reproduction time toward the future reproduction direction in GOP units. The playback terminal 1 receives the GOP information distributed from the distribution server 2 in the order of 1 GOP encoded data. The bidirectional buffer control unit 13 receives GOP information and manages encoded data in units of 1 GOP. At least three GOPs are managed as a ring buffer in order from the past of the playback time, and 3 GOPs are classified as past GOP, current GOP, and future GOP in order of playback time. The encoded data requested for forward distribution is put in the ring buffer, 1 GOP encoded data of the current GOP in the ring buffer is decoded, at least one decoded image buffer is prepared, and this decoded image buffer is controlled and reproduced in the forward direction. In the case of forward reproduction, the presence / absence of encoded data contained in the future GOP is confirmed, and the reproduction time information indicating where the distribution server should perform distribution is determined according to the number of future GOPs and the presence / absence of encoded data.

  Also, when the playback direction is reversed from forward playback to reverse playback and from reverse playback to forward playback, the playback is performed at an over-rate rather than the delivery rate of the encoded data in order to prevent the playback from being interrupted.

  In the case of reverse reproduction, the reproduction terminal 1 requests the distribution server 2 to perform reverse distribution, and the distribution server 2 distributes the encoded data in the past direction in units of GOPs, and the reproduction terminal 1 receives the received encoding. Data is managed in GOP units, and at least three GOPs are managed as a ring buffer in order from the past playback time, the current 1 GOP encoded data in the ring buffer is decoded, and at least two decoded image buffers are prepared. By controlling the decoded image buffer, all pictures including I picture, P picture, and B picture can be played from sequential playback to reverse frame advance playback and reverse feed playback without interruption even in stream distribution. Become.

  In the case of forward playback, the playback terminal 1 requests the delivery server 2 for forward delivery, and the delivery server 2 delivers encoded data in the future direction in GOP units at an over rate. Encoded data is managed in GOP units, and at least three GOPs are managed as a ring buffer in order from the past of the reproduction time, the current 1 GOP encoded data in the ring buffer is decoded, and at least one decoded image buffer is prepared By controlling the decoded image buffer, all pictures including I picture, P picture, and B picture can be played from reverse playback to forward frame advance playback and forward playback without any interruption in the video even in stream distribution. .

  A program for realizing the function of the processing unit in FIG. 1 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed to execute video distribution processing and Video playback processing may be performed. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer system” includes a WWW system having a homepage providing environment (or display environment). The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Further, the “computer-readable recording medium” refers to a volatile memory (RAM) in a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In addition, those holding programs for a certain period of time are also included.

  The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, what is called a difference file (difference program) may be sufficient.

  As mentioned above, although embodiment of this invention has been described with reference to drawings, the said embodiment is only the illustration of this invention, and it is clear that this invention is not limited to the said embodiment. is there. Accordingly, additions, omissions, substitutions, and other changes of the components may be made without departing from the technical idea and scope of the present invention.

  When streaming video, it is indispensable to respond to a change request from forward playback to reverse playback and from reverse playback to forward playback without adding additional information to the bitstream by processing in GOP units. Can be used for various purposes.

  DESCRIPTION OF SYMBOLS 1 ... Reproduction terminal (video reproduction apparatus), 11 ... Transmission part, 12 ... Reception part, 13 ... Bidirectional buffer control part, 14 ... Video output part, 15 ... Operation part, DESCRIPTION OF SYMBOLS 16 ... Decoding part, 17 ... Decoder part, 18 ... Decoded image control part, 19 ... Decoded image buffer part, 2 ... Distribution server (video distribution apparatus), 21 ... Receiving part , 22 ... request content analysis unit, 23 ... reproduction data storage unit, 24 ... transmission unit, 3 ... network

Claims (9)

A video delivery device for delivering video information in response to a request from a video playback device for streaming playback of received video information,
Receiving means for receiving a distribution request and playback time information from the video playback device;
The received distribution request is analyzed, and when the distribution request is reverse distribution, an instruction to read out encoded data in the past direction is output in units of 1 GOP from the beginning of the GOP of the reproduction time based on the received reproduction time information. Request content analysis means,
The read instruction is input, and the encoded data is read in the past direction in units of 1 GOP from the beginning of the GOP of the specified reproduction time, and GOP information that can identify the read 1 GOP encoded data is created and created Reproduction data storage means for outputting the GOP information and the read encoded data in units of 1 GOP;
A video distribution apparatus comprising: transmission means for transmitting the GOP information and the encoded data in units of 1 GOP to the video reproduction apparatus. A video delivery device for delivering video information in response to a request from a video playback device for streaming playback of received video information,
Receiving means for receiving a distribution request and playback time information from the video playback device;
The received distribution request is analyzed, and when the distribution request is sequential distribution, an instruction to read out encoded data in the future direction is output in units of 1 GOP from the top of the GOP of the reproduction time based on the received reproduction time information. Request content analysis means,
The read instruction is input, the encoded data is read in the future direction in units of 1 GOP from the beginning of the GOP of the instructed reproduction time, and GOP information that can identify the read 1 GOP encoded data is created and created Reproduction data storage means for outputting the GOP information and the read encoded data in units of 1 GOP;
A video distribution apparatus comprising: transmission means for transmitting the GOP information and the encoded data in units of 1 GOP to the video reproduction apparatus. The transmission means includes
The video distribution apparatus according to claim 1 or 2, wherein the GOP information and the encoded data in units of 1 GOP are transmitted at an over rate than a distribution rate of the encoded data. A video playback device for streaming playback of video information distributed from a video distribution device in response to a distribution request,
A transmission means for transmitting a reverse delivery request and playback time information to the video delivery device when receiving a reverse playback instruction;
Receiving means for sequentially receiving GOP information distributed in response to the distribution request and encoded data in units of 1 GOP;
Based on the GOP information that can identify the encoded data of 1 GOP unit, the received encoded data of 1 GOP unit is stored in a ring buffer classified as a past GOP, a current GOP, and a future GOP. The encoded data of 1 GOP unit stored in the current GOP of the ring buffer is decoded while shifting the encoded data of 1 GOP unit stored in the ring buffer in the future in GOP units in the future direction. And a playback means for playing back the video information in reverse.   The reproduction time information is determined based on the number of the past GOP and the presence / absence of the encoded data by checking the presence / absence of the encoded data stored in a ring buffer of the past GOP. 5. The video playback device according to 4. A video playback device for streaming playback of video information distributed from a video distribution device in response to a distribution request,
A transmission means for transmitting a distribution request for sequential distribution and reproduction time information to the video distribution apparatus when receiving an instruction for sequential reproduction;
Receiving means for sequentially receiving GOP information distributed in response to the distribution request and encoded data in units of 1 GOP;
Based on the GOP information that can identify the encoded data of 1 GOP unit, the received encoded data of 1 GOP unit is stored in a ring buffer classified as a past GOP, a current GOP, and a future GOP. The encoded data of 1 GOP unit stored in the ring buffer is decoded while the encoded data of 1 GOP unit stored in the ring buffer is shifted in GOP units in the past in the past. And a reproducing means for sequentially reproducing the video information.   The reproduction time information is determined based on the number of the future GOP and the presence / absence of the encoded data by checking the presence / absence of the encoded data stored in a ring buffer of the future GOP. 6. The video reproduction device according to 6.   The video delivery program for functioning a computer as a video delivery apparatus of any one of Claim 1 to 3.   A video playback program for causing a computer to function as the video playback device according to any one of claims 4 to 7.

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