Digital data insertion apparatus and methods for use with compressed audio/video data
Methods and apparatus for transmitting audience measurement data or interactive data via a compressed data bitstream are disclosed. Example methods disclosed herein include eliminating a first type of data within a compressed data bitstream, and packing a second type of data within the compressed data bitstream to occupy a first location within the compressed data bitstream from which the first type of data is eliminated. Disclosed example methods also include inserting at least one of audience measurement data or interactive data in a second location within the compressed data bitstream that is expanded as a result of the packing of the second type of data to form a modified compressed data bitstream, and transmitting the modified compressed data bitstream.
1. A method comprising:
eliminating, by executing an instruction with at least one processor, a first type of data within a compressed data bitstream;
packing, by executing an instruction with the at least one processor, a second type of data within the compressed data bitstream to occupy a first location within the compressed data bitstream from which the first type of data is eliminated, the packing of the second type of data within the compressed data bitstream including shifting the second type of data within data frames of the compressed data bitstream to increase an available space at a second location within the compressed data bitstream;
inserting, by executing an instruction with the at least one processor, at least one of audience measurement data or interactive data in the available space at the second location within the compressed data bitstream that is increased as a result of the shifting of the second type of data to form a modified compressed data bitstream; and
transmitting, by executing an instruction with the at least one processor, the modified compressed data bitstream.
2. A method comprising:
eliminating, by executing an instruction with at least one processor, a first type of data within a compressed data bitstream;
packing, by executing an instruction with the at least one processor, a second type of data within the compressed data bitstream to occupy a first location within the compressed data bitstream from which the first type of data is eliminated;
inserting, by executing an instruction with the at least one processor, at least one of audience measurement data or interactive data in a second location within the compressed data bitstream that is expanded as a result of the packing of the second type of data to form a first modified compressed data bitstream;
multiplexing, by executing an instruction with the at least one processor, a group of modified compressed data bitstreams into a transport stream, the group of modified compressed data bitstreams including the first modified compressed data bitstream;
modulating, by executing an instruction with the at least one processor, the transport stream; and
transmitting, by executing an instruction with the at least one processor, the transport stream.
3. The method of claim 1 , wherein the compressed data bitstream includes at least one of an audio program or a video program.
4. The method of claim 1 , wherein the first type of data includes a skip byte, and the available space at the second location corresponds to an auxiliary data field.
5. The method of claim 1 , wherein the second type of data includes compressed audio data associated with compressed video data.
6. The method of claim 1 , wherein the compressed data bitstream is compliant with an AC-3 format.
7. The method of claim 6 , further including re-computing cyclical redundancy check values for respective AC-3 frames of the compressed data bitstream after inserting the at least one of the audience measurement data or the interactive data in the second location.
8. A system for transmitting audience measurement data, the system comprising:
memory including computer readable instructions; and
a processor to execute the instructions to at least:
eliminate a first type of data within a compressed data bitstream;
shift a second type of data within data frames of the compressed data bitstream and pack the second type of data within the compressed data bitstream to occupy a first location within the compressed data bitstream from which the first type of data is eliminated, the shift of the second type of data within the data frames of the compressed data bitstream to increase an available space at a second location within the compressed data bitstream;
insert at least one of audience measurement data or interactive data in the available space at the second location within the compressed data bitstream that is increased as a result of the shift of the second type of data to form a modified compressed data bitstream; and
transmit the modified compressed data bitstream.
9. A system for transmitting audience measurement data, the system comprising:
memory including computer readable instructions; and
a processor to execute the instructions to at least:
eliminate a first type of data within a compressed data bitstream;
pack a second type of data within the compressed data bitstream to occupy a first location within the compressed data bitstream from which the first type of data is eliminated;
insert at least one of audience measurement data or interactive data in a second location within the compressed data bitstream that is expanded as a result of the packing of the second type of data to form a first modified compressed data bitstream;
multiplex a group of modified compressed data bitstreams into a transport stream, the group of modified compressed data bitstreams including the first modified compressed data bitstream;
modulate the transport stream; and
transmit the transport stream.
10. The system of claim 8 , wherein the compressed data bitstream includes at least one of an audio program or a video program.
11. The system of claim 8 , wherein the first type of data includes a skip byte, and the available space at the second location corresponds to an auxiliary data field.
12. The system of claim 8 , wherein the second type of data includes compressed audio data associated with compressed video data.
13. The system of claim 8 , wherein the compressed data bitstream is compliant with an AC-3 format.
14. The system of claim 13 , wherein the processor is to re-compute cyclical redundancy check values for respective AC-3 frames of the compressed data bitstream after inserting the at least one of the audience measurement data or the interactive data in the second location.
15. At least one computer readable storage device or storage disc comprising instructions that, when executed, cause a machine to at least:
eliminate a first type of data within a compressed data bitstream;
shift a second type of data within data frames of the compressed data bitstream and pack the second type of data within the compressed data bitstream to occupy a first location within the compressed data bitstream from which the first type of data is eliminated, the shift of the second type of data within the data frames of the compressed data bitstream to increase an available space at a second location within the compressed data bitstream;
insert at least one of audience measurement data or interactive data in the second location within the compressed data bitstream that is increased as a result of the shift of the second type of data to form a modified compressed data bitstream; and
transmit the modified compressed data bitstream.
16. At least one computer readable storage device or storage disc comprising instructions that, when executed, cause a machine to at least:
eliminate a first type of data within a compressed data bitstream;
pack a second type of data within the compressed data bitstream to occupy a first location within the compressed data bitstream from which the first type of data is eliminated;
insert at least one of audience measurement data or interactive data in a second location within the compressed data bitstream that is expanded as a result of the packing of the second type of data to form a first modified compressed data bitstream;
multiplex a group of modified compressed data bitstreams into a transport stream, the group of modified compressed data bitstreams including the first modified compressed data bitstream;
modulate the transport stream; and
transmit the transport stream.
17. The at least one computer readable storage device or storage disc of claim 15 , wherein the compressed data bitstream includes at least one of an audio program or a video program.
18. The at least one computer readable storage device or storage disc of claim 15 , wherein the first type of data includes a skip byte, the second type of data includes compressed audio data associated with compressed video content and the available space at the second location corresponds to an auxiliary data field.
19. The at least one computer readable storage device or storage disc of claim 15 , wherein the compressed data bitstream is compliant with an AC-3 format.
20. The at least one computer readable storage device or storage disc of claim 19 , wherein the instructions, when executed, cause the machine to re-compute cyclical redundancy check values for respective AC-3 frames of the compressed data bitstream after inserting the at least one of the audience measurement data or the interactive data in the second location.