JP4226956B2 - Content data transmission method and terminal device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a moving picture recording / reproducing apparatus having a moving picture recording function, wherein content data reproduced in the moving picture recording / reproducing apparatus is encoded to an external terminal having an external reproduction processing function. Content data that can be sent as content data corresponding to parameters Send Method and Terminal Relates to the device.
[0002]
[Prior art]
It is possible to record compressed data by encoding moving image data or transmit it to other terminal devices. As the encoding format, various formats suitable for each application have been proposed, and there are various obstacles in smoothly transmitting image data between different formats. In particular, encoding formats that can be used in mobile terminals are restricted from the viewpoint of display screen size, processing capability, and low power. In addition, with the advent of streaming video data services and the like, there has been a situation where it is not always necessary to hold content data in a mobile terminal.
[0003]
In a moving image playback / transfer apparatus that transfers image data to a conventional mobile terminal (external terminal), there is one type of recording medium and one type of encoding parameter (encoding format) set during moving image recording (playback). Even when the encoded data is sent to the terminal, most of them send data encoded by the same encoding parameter setting. In this case, it is necessary for the external terminal to convert the received encoded data into an encoding format that can be handled by the external terminal, and there is a problem that a burden related to the conversion process increases.
[0004]
Some video playback / transfer devices can be connected to another data conversion device or data conversion adapter to transfer data as encoded data that matches the encoding format of the external terminal. In general, the data receiver converts the data into a convenient form.
[0005]
Furthermore, in the conventional video playback / transfer device, even for those that can support multiple types of encoding formats, it is a format for inquiring from the external terminal side the data format that can be sent by the video playback / transfer device side as a sender, The external terminal is burdened with a lot of processing load (see, for example, Patent Document 1).
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-152307 (page 10, FIG. 1)
[0007]
[Problems to be solved by the invention]
In a conventional video playback / transfer apparatus, when encoded data is sent to an external terminal having different playback restrictions, the data is not necessarily reproducible on the external terminal of the receiver. It was not limited.
[0008]
In particular, mobile communication terminals and the like are greatly restricted by the amount of data, video display screen size, encoding method, and the like compared to stationary devices.
[0009]
Therefore, the problem to be solved by the present invention is not the encoding parameters of the device itself that records and reproduces the content data, but the content data according to the appropriate encoding parameters in response to data acquisition requests from other external terminals. Can be generated and sent as encoded data Content data transmission method and terminal Is to provide a device.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, the present invention In the content transmission method of recording and holding the first content data obtained by encoding the video signal and / or the audio signal in the first encoding format in the recording medium, and transmitting the content data to the external terminal, the recording medium When a data acquisition request is received from an external terminal for the first content data recorded and held in the file, it accompanies the data acquisition request The second encoding parameter The first received and recorded on the recording medium Content data Decoding using the first encoding format, First encoding format Decrypt with Turned into Content data The above Second encoding parameter Are encoded again with the second encoding format included to generate second content data, and for each fragment length specified in the second encoding parameter, the second content data Content data Above Request data acquisition Departure To the external terminal Send To do.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described with reference to the drawings. Terminal device (hereinafter referred to as content data playback / transfer device) The embodiment will be described in detail.
[0012]
With reference to FIG. 2, the content data composed of the content data reproducing / transferring device 1 and the mobile communication terminal (external terminal) 3 according to the present invention. Send The relationship of the system devices will be described. This content data Send The system connects, for example, a content data reproducing / transferring device 1 placed in a house and an external mobile communication terminal 3 via a network 5 including a base station 51, a network server 52, and a mobile communication device data server 53. Configured.
[0013]
Normally, content data suitable for the mobile communication terminal 3 is supplied to the mobile communication terminal 3 by the dedicated mobile communication device data server 53. However, when the content data stored in the content data playback / transfer device 1 is received and played back on the Internet or the like with the content data playback / transfer device 1 that is a network home appliance, the data is brought as it is. In this case, there are many cases where data in a format that cannot be handled by the mobile communication terminal 3 comes. In addition, the mobile communication terminal 3 is unlikely to be restricted in the future due to the nature of the product.
[0014]
Therefore, in the present invention, the content data playback / transfer apparatus 1 receives a recording parameter (second encoding parameter) value sent from the mobile communication terminal 3 in a format that can be handled in the terminal itself, and the designated recording parameter (first recording parameter). 2), the content is re-encoded according to the second encoding parameter), and newly generated re-encoded content data is transmitted. At this time, the second encoding parameter designated by the mobile communication terminal 3 is transmitted separately from the data recording parameter (first encoding parameter) held in the content data reproduction / transfer apparatus 1. Treat as a dedicated recording parameter.
[0015]
As a result, it is possible to prevent an unnecessary increase in the data capacity in the content data playback / transfer apparatus 1, and the external mobile communication terminal 3 has a function as a content previewer in the content data playback / transfer apparatus 1. Can be given.
[0016]
The outline of the configuration of the content data reproducing / transferring apparatus 1 according to the present invention will be described with reference to the block diagram of FIG. The content data reproducing / transferring device 1 includes a receiving unit 11, a content data re-encoding unit 12, a transmitting unit 13, a storage unit 14, and a reproducing unit 15, in addition to the units included in a normal moving image recording / reproducing apparatus. It is comprised.
[0017]
The receiving means 11 is a means for receiving a data acquisition request from the external terminal 3, and includes a parameter (second encoding parameter) for re-encoding content data accompanying the data acquisition request, a variable speed reproduction data request, A second encoding parameter receiving unit 111 that acquires data such as a fragment length is included.
[0018]
The content data re-encoding unit 12 is encoded with the recording parameter (first encoding parameter) for the content data reproducing / transferring device retrieved from the recording unit 14 and reproduced by the content data designated by the external terminal 3 An AV separation unit 121 that separates audio data and moving image data from the first content data, and audio data decoding that decodes the audio data using a recording parameter (first encoding parameter) for the content data reproduction / transfer device , The moving image data decoding unit 123 for decoding moving image data using the recording parameters for the content data reproducing / transferring device, and the recording parameter (the first parameter specified by the external terminal 3) Audio data re-encoding unit 124 for re-encoding with the second encoding parameter) and decoded moving image data The moving image data re-encoding unit 125 that re-encodes with the second encoding parameter designated from the external terminal 3, and the AV that multiplexes the re-encoded audio data and moving image data and outputs it as the second content data A multiplex unit 126 is included.
[0019]
That is, the content data re-encoding unit 12 temporarily decodes the first content data encoded with the first encoding parameter reproduced from the storage unit 14 and the second encoding parameter designated by the external terminal 3. Is encoded again and output as second content data.
[0020]
The content data re-encoding unit 12 is operable with any one of a plurality of encoding parameters, decodes the first content data reproduced by the reproducing unit 15 with the first encoding parameter, and decodes the decoded content data. Is re-encoded with the second encoding parameter received from the external terminal 3 to generate second content data, and the reproduction means 15 treats the variable-speed reproduction content data that has been subjected to variable-speed reproduction as a normal speed, as the second content data. It has a function of generating the second content data by encoding again with the encoding parameter.
[0021]
The transmission means 13 is means for sending the second content data to the external terminal 3, and has a fragment monitoring unit 131, and is based on the fragment length acquired from the second encoding parameter attached to the data acquisition request. The second content data fragment is monitored, and streaming type data transmission is performed in which the second content data is sequentially transmitted to the external terminal 3 for each predetermined fragment length.
[0022]
The storage means 14 is means for storing the first content data encoded with the first encoding parameter.
[0023]
The reproduction unit 15 is a unit that searches and reproduces the content data in the storage unit 14 based on the reproduction designation data designated by the data acquisition request from the external terminal 3, and the second encoding parameter designated by the external terminal 3 Is a means for performing variable speed reproduction of designated content data at a designated reproduction speed.
[0024]
The processing at the time of data acquisition request in the content data playback / transfer apparatus 1 having the above configuration will be described with reference to the flowchart of FIG. The receiving unit 11 receives a data acquisition request specifying content data to be reproduced from the external terminal 3 (S100), and the second encoding parameter receiving unit 111 acquires a second encoding parameter associated therewith (S100). S101). Data such as an encoding format, a bit rate, and a frame rate at the time of content recording / playback is acquired by the second encoding parameter. The acquired second encoding parameter is set for content data transfer processing (S102).
[0025]
Subsequently, processing for starting the content data reproduction operation and starting the content data transfer operation (content data re-encoding operation) is performed (S103), and the operation for reproducing the content data designated by the data acquisition request is started and reproduced. The reproduced content data is decoded with the first encoding parameter, and the decoded content data is re-encoded with the second encoding parameter (S104).
[0026]
A content data transfer operation is performed on the re-encoded content data re-encoded with the second encoding parameter for each data encoding unit designated in advance by the second encoding parameter, and is sent to the external terminal 3. Then, re-encoded content data for the data encoding unit is sent (S105).
[0027]
Subsequently, it is determined whether or not an instruction to end data transmission has been received by determining whether or not to end the data transmission (S106). If no end instruction has been received, the content data transfer in the processing step S104 is performed in order to start the subsequent content data transfer operation. Proceed to the processing stage of the operation. If it is determined in the end instruction determination in the processing step S106 that an end instruction has been entered, the process proceeds to end, and the data transmission process ends (S107).
[0028]
In this way, in accordance with the data acquisition request from the external terminal 3, re-encoded content data encoded in a format suitable for the playback function of the external terminal 3 based on the designated second encoding parameter is transmitted. It is possible to perform the decoding (reproduction) processing of the re-encoded content data on the external terminal 3 side.
[0029]
Here, a configuration example of the encoding parameter is shown in FIG. FIG. 4 (a) is an example of the first or second encoding parameter, and shows each internal element constituting the first or second encoding parameter set T100.
[0030]
The first or second encoding parameter set T100 includes a file format T01 which is an AV multiplexed format, a fragment interval T02 indicating the length of a fragment serving as a basic unit of data transmission, audio (Audio) data and video (Video). AV interleave interval T03, which is a basic unit for combining data, Video encoding format T04, image size T05, which is the size of an image to be encoded, frame rate T06, which is a video update frequency, and encoding bits of a video elementary stream Video bit rate T07 which is a rate, Intra frame interval T08 indicating the interval of video frames in which intra-frame encoding is performed, Audio encoding format T09, Audio sampling frequency T10, Mono Le / stereo is an encoding bit rate of the channel mode T11, Audio elementary stream is specified, such is composed of Audio bitrate T12.
[0031]
On the other hand, as a specific example of the second encoding parameter setting at the time of data request from the external terminal 3, that is, the mobile communication terminal, the second encoding parameter set as shown in FIG. There is T110.
[0032]
That is, the second encoding parameter T110 on the external terminal 3 side is the MP4 file format for the file format T01, 5 seconds for the fragment interval T02, 1 second for the AV interleave interval T03, and MPEG-4 Visual SimpleProfile for the Video encoding format T04. @ LEVEL1, image size T05 is horizontal 176 x vertical 144, frame rate T06 is 15 fps, video bit rate T07 is 64 kbps, Intra frame interval T08 is 1 second, Audio encoding format T09 is MPEG-4 AAC LC Profile, Audio sampling The frequency T10 is 22.05 kHz, and the channel mode T11 that is designated as monaural / stereo is stereo, and the audio bit rate T12 is 6. It is set in kbps.
[0033]
In this way, there is a restriction on the reproducible content on the mobile communication terminal 3 side, and it is impossible to replay the content acquired on the mobile communication terminal 3 side unless the content according to this is received. Become.
[0034]
Furthermore, a specific example of the first encoding parameter setting on the content data playback / transfer apparatus 1 side as a sender and the second encoding parameter at the time of data request from the mobile communication terminal 3 which is the data conversion destination FIG. 5 shows a comparison with a specific example of the setting, and FIG. 5A shows an example of setting the first encoding parameter T120 on the content data playback / transfer apparatus 1 side (original data side). FIG. 5B shows a setting example of the second encoding parameter T130 on the mobile communication terminal 3 side. In this example, the second encoding parameter T130 on the mobile communication terminal 3 side is the same as the example of the second encoding parameter set T110 illustrated in FIG. 4B.
[0035]
The first encoding parameter T120 (FIG. 5 (a)) on the content data playback / transfer apparatus 1 side is assumed to encode SDTV broadcast level video with normal NTSC video data as input, and the file format T01. MPEG-2TS, no fragment interval T02, AV interleave interval T03 is variable, Video encoding format T04 is MPEG-2 MainProfile @ Main Level, image size T05 is horizontal 640 × vertical 480, frame rate T06 is 29.97 fps, Video bit rate T07 is 11 Mbps, Intra frame interval T08 is 0.5 seconds, Audio encoding format T09 is MPEG-1 Audio Layer 2, and Audio sampling frequency T10 is 44.1 kHz. Nerumodo T11 stereo, Audio bitrate T12 is set to 384 kbps.
[0036]
In this way, when content data recorded / held in the content data playback / transfer apparatus 1 is requested from an external mobile communication terminal 3 and is desired to be viewed, data conversion is necessary, Since the mobile communication terminal 3 is not always the same, the second encoding parameter T130 as shown in FIG. 5 (b) is sent and the data according to it is configured. Then, the process to send becomes effective.
[0037]
An example of setting the data transmission unit according to the value of the fragment interval T02 transmitted from an external portable communication terminal is also conceivable.
[0038]
FIG. 6 shows an example of the processing flow in that case. When the data acquisition request from the external terminal 3 arrives, a data acquisition request reception process (S100) is performed. Subsequently, the second encoding parameter acquisition process (S101) allows the encoding format and bit rate at the time of moving image recording. The second encoding parameter containing data such as the frame rate is acquired.
[0039]
In the second encoding parameter setting process (S102), the second encoding parameter is set for the content data transfer process.
[0040]
Subsequently, the content data reproduction operation for reproducing the content data requested by the data acquisition request is started by the content data reproduction operation start / content data transfer operation start processing (S103). A content data transfer operation of decoding certain playback content data using the first decoding parameter, re-encoding the decoded content data using the second encoding parameter, and sending the decoded content data to the external terminal 3 is started.
[0041]
A content data transfer operation process (S104) is performed for each fragment unit by setting the second encoding parameter, and it is determined whether re-encoded data for the fragment unit is generated (S108). When the re-encoded data is generated, the re-encoded data for the fragment unit is transmitted in the generated content data transmission process (S109).
[0042]
If re-encoded data for the fragment unit has not been generated, the process proceeds to the next process.
[0043]
Subsequent to the processing step S108 or the processing step S109, it is determined by an end instruction determination process whether or not a data transmission end instruction has been entered (S110). In order to enter, the process proceeds to the content data transfer process in the process step S104. If it is determined in the end instruction determination process step S106 that an end instruction has been entered, the process proceeds to process end S111, and the content data transfer process ends.
[0044]
In this way, in accordance with the data request from the external terminal 3, based on the second encoding parameter specified by the external terminal 3, the re-encoded content data suitable for the playback function of the external terminal 3 is specified. It is transmitted for each unit, and the re-encoded content data can be smoothly decoded (reproduced) on the external terminal 3 side.
[0045]
Here, an example in which the processing flow described so far is expressed by a flow of comparison between the processing on the content data reproduction / transfer device 1 side and the processing on the external mobile communication terminal 3 side is shown in FIG. It explains using.
[0046]
A data acquisition request (content request) is transmitted from the external mobile communication terminal 3 side to the content data reproduction / transfer apparatus 1 (S200), and a second encoding parameter is transmitted to the content data reproduction / transfer apparatus 1 side. (S201).
[0047]
The content data playback / transfer apparatus 1 side receives the data acquisition request (S202), and further receives the second encoding parameter (S203). Subsequently, the content designated by the data acquisition request is searched from the storage unit 14 (S204).
[0048]
After searching for the designated content, the reproduction of the designated content is started (S205), the reproduced content is decoded with the first encoding parameter, and the decoded content data is re-encoded according to the second encoding parameter. The re-encoding process is started (S206). Re-encoded content data for the transmission unit is generated (S207), and the re-encoded content data for the transmission unit is transmitted to the external mobile communication terminal 3 (S208). On the external mobile communication terminal 3 side, the re-encoded content data is received (S209), the re-encoded content data for the transmission unit is acquired, and is set in a state where it can be decoded (reproduced).
[0049]
Re-encoded content data acquisition and re-encoded content on the mobile communication terminal 3 side are continuously performed by repeating the processing steps S207 and S208 on the content data reproduction / transfer apparatus 1 side and the processing step S209 on the mobile communication terminal 3 side. Data is decoded (reproduced).
[0050]
When the re-encoded content transfer of the specified content is completed, the content data playback / transfer apparatus 1 ends the data transmission process of the specified content (S210), and the notification of the completion of the encoded data transmission is sent to the mobile communication terminal 3 (S211), the mobile communication terminal 3 that has received the encoded data transmission completion notification executes content data reception completion processing, and ends a series of data acquisition / decoding (playback) processing (S212). ).
[0051]
By such processing on the content data playback / transfer device 1 side and processing on the external mobile communication terminal 3 side, video content playback on the external mobile communication terminal becomes possible, and on the content data playback / transfer device 1 side, It is not necessary to prepare a plurality of the same source content in any encoding format, and the content can be transmitted according to the processing performance of the mobile communication terminal 3 that has requested the data. On the mobile communication terminal 3 side, The function as a previewer of the content data reproducing / transferring apparatus 1 is satisfied.
[0052]
FIG. 8 is an example in which the transmission unit of the re-encoded content data is the fragment unit in the example of FIG. 7, and the specified fragment unit instead of the processing step S207 for generating the re-encoded content data for the transmission unit. Processing for generating re-encoded data (S213), processing for transmitting re-encoded data for a specified fragment unit (S214) instead of transmission processing step S208 for re-encoded data for a transmission unit, content data This is a processing flow in which a reception process (S215) of partial content data for a specified fragment unit is provided instead of the reception process step S209.
[0053]
By such processing on the content data playback / transfer device 1 side and processing on the external mobile communication terminal 3 side, streaming playback can be performed by transmitting video content in units of fragments in the external mobile communication terminal 3. On the mobile communication terminal 3 side, the function as a previewer of the content data reproduction / transfer apparatus 1 is satisfied.
[0054]
For the example of FIG. 6, the processing flow of the content data playback / transfer apparatus 1 when an instruction to change the playback mode is received from the external mobile communication terminal 3 that issued the content data request at the time of data transmission is shown. This is the example of FIG.
[0055]
Upon receipt of the data acquisition request from the external terminal 3, a data acquisition request reception process is performed (FIG. 6, S100). Subsequently, the second encoding parameter is received, and the encoding format at the time of recording content data, Data such as a bit rate and a frame rate is acquired (S101 in FIG. 6). In the second encoding parameter setting process, the second encoding parameter is set for the content data transfer process (FIG. 6, S102).
[0056]
Subsequently, a content data playback operation of the content data requested by the data acquisition request is started by the content data playback operation start / content data transfer operation start processing S103, and the playback content data played back by the content data playback operation is started. Is decoded with the first encoding parameter to obtain decoded content data, the decoded content data is re-encoded with the second encoding parameter to be re-encoded content data, and the re-encoded content data is The content data transfer operation to be transmitted is started according to the second encoding parameter setting.
[0057]
For each fragment unit, content data transfer processing S104 is performed by setting the second encoding parameter, and it is determined in processing step S108 whether or not re-encoded content data for the fragment unit has been generated. When encoded content data has been generated, re-encoded content data for each fragment is transmitted in the re-encoded content data transmission process S109.
[0058]
If re-encoded data for the fragment unit has not been generated, the process proceeds to the next process.
[0059]
Subsequent to the processing step S108 or the processing step S109, it is determined in the determination S216 whether or not a reproduction mode change instruction is input from the external terminal 3, and if the reproduction mode change instruction is not input, the processing step S110 is continued as it is. move on. If it is determined in the playback mode change instruction determination S216 that a playback mode change instruction has been entered, a content data playback mode change S217 is performed, and content data playback processing is performed in a new playback mode.
[0060]
Subsequent to the processing step S216 or the processing step S217, it is determined in the end instruction determination S110 whether or not a data transmission end instruction has been input. If no end instruction has been input, in order to enter the subsequent content data transfer operation, The process proceeds to the content data transfer operation S104. If it is determined in the end instruction determination S106 that an end instruction has been entered, the process proceeds to a process end S111 to end the data transmission process.
[0061]
With reference to FIG. 10, a description will be given of a mechanism for reconstructing moving image content data when a double-speed (fast forward) reproduction is instructed as a reproduction mode.
[0062]
The decrypted content data T150 obtained by decoding (decoding) the moving image content data T140 originally stored on the content data reproduction / transfer device 1 side is obtained, and the decrypted content data T150 is further input as the data. Re-encoded content data T160 that has been re-encoded according to the second encoding parameter designated from the external mobile communication terminal 3 that has requested it. Toss To be reconfigured.
[0063]
The moving image content data T140 is reproduced with double speed (fast forward) handling, and one skipped decoding result becomes the decoded content data T150 to be re-encoded. In the example of the decoded content data T150, the odd-numbered frame of the decoding result is the decoded content data T150 to be re-encoded. On the other hand, in the re-encoding, the decoded content data T150 is re-encoded as normal speed handling, and re-encoded content data T160 is generated.
[0064]
In this way, the content data recorded / held in the content data playback / transfer device 1 can be sent out from the external mobile communication terminal 3 according to the request, and for variable speed playback such as double speed (fast forward) playback. However, the data can be transmitted to the external mobile communication terminal 3 by the normal streaming playback device, and it is not necessary to provide an extra variation of the playback processing device on the external mobile communication terminal 3 side.
[0065]
Here, the processing flow in the case where an instruction for changing the playback mode (variable playback: double speed playback), which has been described so far, is given, is the processing on the content data playback / transfer device 1 side and external mobile communication. An example expressed by a flow of comparison with the processing on the terminal 3 side is shown in FIG.
[0066]
In accordance with the content request, re-encoded content data for the designated fragment unit is generated from the external mobile communication terminal 3 side (S213), and the re-encoded content data for the designated fragment unit is transmitted (S214). . The external mobile communication terminal 3 side receives the re-encoded content data for the designated fragment unit (S215), thereby acquiring and reproducing the re-encoded content data for the transmission unit.
[0067]
Here, a playback mode change request (S218) and a designated playback mode (S219) for requesting a change of the playback mode are sent from the external mobile communication terminal 3 side to the content data playback / transfer device 1 side to play back the content data. The transfer device 1 performs a reproduction mode change request reception process (S220) and a designated reproduction mode reception process (S221), and then starts variable speed reproduction according to the designated reproduction mode (S222).
[0068]
Thereafter, the reproduction process generates re-encoded content data for the designated fragment unit (S213) while moving according to the designated reproduction mode, and re-encoded content data for the designated fragment unit. Transmission (S214) is performed. On the external mobile communication terminal 3 side, the re-encoded content data for the transmission unit is acquired and reproduced by receiving the partial content data for the designated fragment unit (S215).
[0069]
In this way, even when a variable speed playback (double speed playback) designation is received from the external terminal 3, the moving image content can be reconstructed and transmitted according to the designation. In addition, the receiving external terminal 3 only has a normal streaming playback function, and as a way of viewing the content during playback, it corresponds to variable speed playback.
[0070]
With reference to FIG. 12, a description will be given of a mechanism for reconstructing content data in the case where 1 / 2-speed (slow) playback is instructed as a playback mode.
[0071]
The encoded content data T140 originally stored on the content data playback / transfer apparatus 1 side is played back at 1/2 times speed and decoded to obtain 1/2 times speed playback decoded content data T170. Re-encoded content data T180 is obtained by re-encoding the 2 × speed playback decoded content data again according to the second encoding parameter designated from the external mobile communication terminal 3 that has requested the data.
[0072]
The encoded content data T140 is decoded and played back at 1/2 times speed (slow), and 1/2 times speed playback decoded content data T170 that is a target of re-encoding of the decoding result is generated. In the example of 1/2 times speed playback decoded content data T170, the 1/2 times speed (slow) decoding result is decoded content data after decoding to be re-encoded. On the other hand, in the re-encoding process, the half-speed playback decoded content data T170 is re-encoded with the second encoding parameter as normal speed handling, and re-encoded content data T180 is generated.
[0073]
In this way, the moving image content recorded / held in the content data playback / transfer device 1 can be transmitted from the external portable communication terminal 3 according to the request, and further, variable speed playback such as ½ speed (slow) playback. On the other hand, it is possible to transmit data to the external mobile communication terminal 3 by the normal streaming playback mechanism, and it is necessary to provide an extra variation of the playback processing mechanism on the external mobile communication terminal 3 side. Absent.
[0074]
In the above description, the content data stored in the content data reproducing / transferring device has been described in general. However, when moving image data composed of image data and audio data is targeted as content data, the present invention provides: It is extremely effective.
[0075]
【The invention's effect】
In accordance with the present invention, content data that can determine and select a suitable encoding format in response to a data request from another external terminal and appropriately transmit the encoded data Transmission method and terminal An apparatus can be provided.
[Brief description of the drawings]
FIG. 1 is a block diagram for explaining an outline of a configuration of a content data reproduction / transfer apparatus according to the present invention.
FIG. 2 is a diagram for explaining the relationship between devices constituting a content data reproduction / transfer system according to the present invention.
FIG. 3 shows an example of a processing flow in the content data reproduction / transfer apparatus of the present invention.
FIG. 4 is an example of a second encoding parameter specified from an external terminal in the present invention.
FIG. 5 shows an example of a comparison between a first encoding parameter originally used in the content data reproducing / transferring apparatus and a second encoding parameter designated from the external terminal 3 in the present invention.
FIG. 6 shows another example of the processing flow in the content data playback / transfer apparatus of the present invention.
FIG. 7 shows an example of data exchange between the content data reproducing / transferring device and an external portable communication terminal in the present invention.
FIG. 8 shows another example of data exchange between the content data reproducing / transferring device and the external portable communication terminal in the present invention.
FIG. 9 shows an example of a processing flow in the content data playback / transfer apparatus 1 of the present invention.
FIG. 10 shows an example of how video content data is reconstructed when double-speed playback is specified in the present invention.
FIG. 11 shows another example of data exchange between the content data reproducing / transferring device and the external portable communication terminal in the present invention.
FIG. 12 shows an example of how video content data is reconstructed when slow playback is specified in the present invention.
[Explanation of symbols]
1 Content data playback / transfer equipment
11 Receiving means
111 2nd encoding parameter receiving part
12 Content data re-encoding means
121 AV separation unit
122 Voice data decoding unit
123 Video data decoder
124 Voice data re-encoding unit
125 Video data re-encoding unit
126 AV multiplexing section
13 Transmission means
131 Fragment monitor
14 Storage means
15 Reproduction means (various speed reproduction)
3 Mobile communication terminal (external terminal)
5 Communication network
51 base station
52 Network server
53 Data Server

Claims (6)

In a content data transmission method of recording and holding first content data obtained by encoding a video signal and / or an audio signal in a first encoding format in a recording medium and transmitting the content data to an external terminal ,
The relative said recorded held in the recording medium the first content data, when the data acquisition request comes from the external terminal receives a second encoding parameters associated with the data acquisition request,
The first content data recorded held in the recording medium and decrypted by using the first encoding format, the content data decoded by the first coding format, the second encoding parameter Re-encoding with the second encoding format included in the to generate second content data,
A content data transmission method, comprising: sequentially transmitting the second content data to an external terminal that has issued the data acquisition request for each fragment length specified in the second encoding parameter . The content data transmission method according to claim 1, wherein the content data is moving image data . 3. The content data transmission method according to claim 1, wherein the second encoding parameter includes data indicating an AV interleaving interval that is a unit for combining a video signal and an audio signal . Storage means for storing first content data encoded in a first encoding format;
Receiving means for receiving a data acquisition request from an external terminal and a second encoding parameter associated therewith;
Reproduction means for reproducing the first content data from the storage means;
The first content data that is enabled and operable in any one of a plurality of encoding formats is decoded in the first encoding format, and the decoded content data is converted into the second encoding parameter received from the external terminal. Content data re-encoding means for re-encoding in the included second encoding format to generate second content data;
Transmission means for sequentially transmitting the second content data to the external terminal that has issued the data acquisition request for each fragment length specified in the second encoding parameter.
A terminal device that stores content data and transmits the content data in response to a data acquisition request from an external terminal. The receiving means has a function of receiving a second encoding parameter and a variable speed reproduction data request accompanying a data acquisition request;
The reproduction means has a function of performing variable-speed reproduction of the first content based on the variable-speed reproduction data request;
The content data re-encoding means treats the variable speed playback content data decoded in the first encoding format as a normal speed and re-encodes in the second encoding format to generate second content data. The terminal device according to claim 4, wherein the terminal device has a function of: 6. The terminal apparatus according to claim 4, wherein the second coding parameter includes data indicating an AV interleave interval, which is a unit for combining a video signal and an audio signal .

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