Methods and systems for providing file data for a media file
A method of providing file data for a media file of a pre-determined format from a file system comprising a file record database and a data store, wherein the media file corresponds to a programme consisting of a plurality of segments, and wherein the segments included in the programme are dynamically determined. The method comprising the steps of receiving details of the programme including the duration of the programme, and determining the layout of the media file in the pre-determined format from the received details of the programme, the layout including locations for essence data within the file. A file record for the media file in the file record database is then created. In response to a request for the location of essence data within the file, a location given by determined layout of the media file is returned. Further, in response to an instruction that a segment is to be included in the programme, essence data corresponding to the contents of the segment is obtained. Then, in response to a request for a portion of essence data from the media file corresponding to a time period of the programme, essence data derived from the received essence data according to the determined layout of the media file is returned.
1. A file system for providing file data for a media file having a predetermined format, the file system comprising:
a data store storing essence data;
a memory; and
a processor configured to implement instructions on the memory so as to provide a media manager that:
determines the predetermined format of the media file, which corresponds to a program comprising a plurality of segments;
calculates a maximum segment length for the program based on the predetermined format of the media file;
determines, prior to the essence data making up the media file being available, a layout of the media file in the predetermined format based on a time duration of the program and the maximum segment length, with the layout defining at least one location for the essence data within the media file;
in response to a request for the at least one location of the essence data within the media file, returns a location for the essence data defined by the determined layout of the media file;
in response to an instruction that a respective segment among the plurality of segments is to be included in the program, obtains the essence data from the data store that corresponds to contents of the respective segment; and
returns the essence data based on the determined layout of the media file in response to a request for a portion of the essence data from the media file.
2. The file system according to claim 1 , wherein the media manager determines the predetermined format of the media file based on an index that provides a mapping of time ranges for the plurality of segments for the program.
3. The file system according to claim 1 , wherein the predetermined format of the media file defines the plurality of segments of the essence data located at pre-declared locations within the media file, and the media manager determines the layout of the media file based on calculated locations of each segment of the media file to have the maximum segment length.
4. The file system according to claim 1 , wherein the media manager delays the return of the essence data to vary a speed at which the file system provides the essence data.
5. The file system according to claim 1 , wherein the media manager receives an instruction that a segment is to be included in the program and obtains the essence data for the segment that is derived from the received essence data by omitting, duplicating and/or interpolating frames of the received essence data.
6. The file system according to claim 1 , wherein the media manager determines the layout of the media file based on time offsets and byte offsets for frames of image data within the media file.
7. A file system for providing file data for a media file having a predetermined format, the file system comprising:
a data store storing essence data;
a memory; and
a processor configured to implement instructions on the memory so as to provide a media manager that:
determines the predetermined format of the media file for a program that includes a plurality of segments;
determines, prior to the essence data making up the media file being available, a layout of the media file in the predetermined format based on a time duration of the program, with the layout defining at least one location for the essence data in the media file;
in response to a request for the at least one location of the essence data, returns a location for the essence data defined by the determined layout of the media file;
in response to an instruction that a respective segment among the plurality of segments is to be included in the program, obtains the essence data from the data store that corresponds to the respective segment; and
in response to a request for a portion of the essence data from the media file, determines the essence data based on the determined layout of the media file.
8. The file system according to claim 7 , wherein the media manager determines the predetermined format of the media file based on an index that provides a mapping of time ranges for the plurality of segments for the program.
9. The file system according to claim 7 , wherein the processor is further configured to implement instructions to provide the media manager that:
calculates a maximum segment length for the program based on the predetermined format of the media file,
wherein the predetermined format of the media file defines the plurality of segments of the essence data located at pre-declared locations within the media file, and the media manager determines the layout of the media file based on calculated locations of each segment of the media file to have the maximum segment length.
10. The file system according to claim 7 , wherein the media manager delays the return of the essence data to vary a speed at which the file system provides the essence data.
11. The file system according to claim 7 , wherein the media manager receives an instruction that a segment is to be included in the program and obtains the essence data for the segment that is derived from the received essence data by omitting, duplicating and/or interpolating frames of the received essence data.
12. The file system according to claim 7 , wherein the media manager determines the layout of the media file based on time offsets and byte offsets for frames of image data within the media file.
13. A system for providing file data for a media file having a predetermined format, the system comprising:
a memory; and
a processor configured to implement instructions on the memory so as to a file system that:
determines, based on an index that provides a mapping of time ranges for a plurality of segments for a program, the predetermined format of the media file for the program that includes a plurality of segments;
calculates a maximum segment length for the program based on the predetermined format of the media file;
determines, prior to essence data making up the media file being available, a layout of the media file in the predetermined format and based on a time duration of the program and the calculated maximum segment length, with the layout defining at least one location for the essence data in the media file;
in response to a request for the at least one location of the essence data, returns a location for the essence data to be included in the media file and that is defined by the determined layout of the media file;
in response to an instruction that a respective segment is to be included in the plurality of segments for the program, obtains the essence data from a data store that corresponds to the respective segment; and
in response to a request for a portion of the essence data from the media file, returns the essence data based on the determined layout of the media file.
14. The file system according to claim 13 , wherein the predetermined format of the media file defines the plurality of segments of the essence data located at pre-declared locations within the media file, and the processor determines the layout of the media file based on calculated locations of each segment of the media file to have the maximum segment length.
15. The file system according to claim 13 , wherein the processor delays the return of the essence data to vary a speed at which the file system provides the essence data.
16. The file system according to claim 13 , wherein the processor receives an instruction that a segment is to be included in the program and obtains is configured to obtain the essence data for the segment that is derived from the received essence data by omitting, duplicating and/or interpolating frames of the received essence data.
17. The file system according to claim 13 , wherein the processor determines the layout of the media file based on time offsets and byte offsets for frames of image data within the media file.