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Correct MD5 sum calculation for non-whole byte bit depths #193

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merged 1 commit into from Dec 22, 2022
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Correct MD5 sum calculation for non-whole byte bit depths #193

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2 changes: 1 addition & 1 deletion flac.md
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Expand Up @@ -228,7 +228,7 @@ FLAC specifies a minimum block size of 16 and a maximum block size of 65535, mea

The sample rate MUST NOT be 0 when the FLAC file contains audio. A sample rate of 0 MAY be used when non-audio is represented. This is useful if data is encoded that is not along a time axis, or when the sample rate of the data lies outside the range that FLAC can represent in the streaminfo metadata block. In case a sample rate of 0 is used it is RECOMMENDED to store the meaning of the encoded content in a Vorbis comment field or an application metadata block. This document does not define such metadata.

The MD5 signature is made by performing an MD5 transformation on the samples of all channels interleaved, represented in signed, little-endian form. This interleaving is on a per-sample basis, so for a stereo file this means first the first sample of the first channel, then the first sample of the second channel, then the second sample of the first channel etc. Before performing the MD5 transformation, all samples must be byte-aligned. So, in case the bit depth is not a whole number of bytes, additional zero bits are inserted at the most-significant position until each sample representation is a whole number of bytes.
The MD5 signature is made by performing an MD5 transformation on the samples of all channels interleaved, represented in signed, little-endian form. This interleaving is on a per-sample basis, so for a stereo file this means first the first sample of the first channel, then the first sample of the second channel, then the second sample of the first channel etc. Before performing the MD5 transformation, all samples must be byte-aligned. In case the bit depth is not a whole number of bytes, the value of each sample is sign extended to the next whole number of bytes.

## Padding

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