view doc/PCM-file-formats @ 146:0fa0cd251a31

gsmefr-dec-parse: use factored-out ETSI bit reader
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 14 Dec 2022 08:05:08 +0000
parents 195911f2211c
children a217a6eacbad
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What file format should be used for 16-bit PCM sample recordings?  The first
(in the order of development) group of utilities in the present package that
need to read and write such files are gsm[e]fr-encode and gsm[e]fr-decode,
designed to mirror amrnb-enc and amrnb-dec from opencore-amr FOSS package;
these utilities read and write WAV files and even use WAV reading and writing
functions copied from opencore-amrnb test code.

However, as I (Mother Mychaela) keep developing more tools, my use cases become
more diverse: in some use cases WAV is most convenient (e.g., when playing or
recording with SoX tools), but in other use cases a raw sample file without any
header is much more convenient.  To address this diversity of use cases, a pair
of conversion utilities have been written:

pcm16-raw2wav converts from raw format to WAV
pcm16-wav2raw converts from WAV to raw format

Both utilities take a mandatory command line argument specifying the endian
order for the raw format - there is no default.