A method comprising identifying a sample rate of received audio content, receiving a conversion sample rate, and converting the received audio content to the received conversion sample rate. Wherein the conversion comprises utilizing a repeating sequence of packets where all but one of the packets of each sequence are truncated to a whole number of samples, while the remaining packet is rounded up to the next whole number of samples if the conversion fails to resolve packet size to a whole number.

A method for upsampling a digital audio signal is described. The method includes receiving a first digital audio signal including samples and having a first sampling rate. The method also includes outputting at least one sample from the first digital audio signal as part of a second digital audio signal, the second digital audio signal having a desired second sampling rate, the second sampling rate being higher than the first sampling rate. The method also includes incrementing a counter for each sample from the first digital audio signal that is output as part of the second digital audio signal. The method also includes, when the counter exceeds a threshold number, inserting at least one synthetic sample as part of the second digital audio signal. The method also includes repeating the outputting, incrementing, and inserting until all the samples in the first digital audio signal have been output.

A method of generating a filter graph of a development project is presented comprising identifying a plurality of source clips comprising the development project, wherein each source clip represents an access to a source, and combining two or more accesses for two or more source clips into a single access if the two or more source clips satisfy one or more criteria.

A sample rate conversion is accomplished by presenting to a numerically controlled oscillator (NCO) register a clock input at the desired output rate; first-modifying the NCO register contents responsive to a first factor; determining when the first modified NCO register contents are in a predetermined range and in response to the first modified NCO register contents not being in the predetermined range, presenting the first modified NCO register contents to the input of the NCO register; second-modifying, responsive to a second factor, the first modified NCO register contents when the first modified NCO register contents are within the predetermined range and presenting it to the input of the NCO register; and fetching samples, in response to the first-modified NCO register contents being in the predetermined range and interpolating them to produce a resultant sample value at the output rate, and in response to the contents not being in the predetermined range to interpolate the previous sample to produce a resultant sample value at the output rate.

Methods and systems for processing media content are described. In one embodiment, a software-implemented matrix switch is used in connection with multi-media editing software that enables users build or define their own editing multi-media editing projects that incorporate multiple different user-selected clips into an integrated project. Flexibility and efficiency can be provided through the use of a composite or composition which is a representation of an editing project as a single track. Editing projects can have one or more tracks, and each track can be associated with one or more data stream sources that can have effects or transitions applied on them. Compositions can be nested inside one another and provide an economical way for complex editing manipulations to take place.