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diff --git a/README.md b/README.md new file mode 100644 index 0000000..ed9a663 --- /dev/null +++ b/README.md @@ -0,0 +1,57 @@ +S/PDIF tools +=========== + +These simple programs convert raw AC3 (Dolby Digital, A/52) and DTS streams +into WAV files containing the S/PDIF fake PCM encoding thereof. This means +that if such a .wav file is replayed correctly bit-by-bit via the S/PDIF +output of a device and supplied to a standards compliant decoder, it +will be recognized as a standards compliant AC3/DTS stream, +indistinguishable from a stream generated e.g. by a DVD player. + +This is useful to e.g. author CDs containing compressed multichannel +data (such as DTS encoded CDs that commercially available). +Take care: Playing back the files produced via speakers at high volume +may damage these or your hearing. + + +A note about coding style +------------------------- + +These sources are very old (from around 2006/2007) and show my coding +abilities back then when I started with C. I hope to clean this up +and modernize it at some point in the future. + + +ac32spdif +--------- + +This tool takes a raw .ac3 file and converts it into a .wav file of the +same sample rate containing one AC3 frame plus padding zeros for the +remaining time of that frame's time slot. + + +dts2spdif +--------- + +In a similar fashion, this tool translates a .dts file to a .wav file. +Currently it only supports 16 bit encapsulation, i.e. the data stream +is included in the .wav file 1:1. +The DTS specification also defines a 14 bit format for use with CDs +where there is a possibility that the data will be played back via +speakers in order to reduce the possibility of speaker/hearing damage +when the medium is played back without a DTS decoder. In this case, +only the lower 14 bits of a word would be used, with the high 2 bits +set to zero. This encoding may be added to dts2spdif later on. + + +License +------- + +As usual, this code comes with no warranty whatsoever. I am especially +not responsible if you blow up your speakers or ears using these tools. + +Do whatever you like with this code, but if you use it for your own +application I would appreciate an attribution note in the documentation. +Thanks! + + -- norly |