soxr

README.md

@@ -14,8 +14,7 @@ backends:
 - libao
 - libFLAC
 - mpg123
-- FFmpeg libraries, including libavutil, libavcodec, libavformat and
-  libswresample
+- FFmpeg libraries, including libavutil, libavcodec and libavformat
 
 For encoding, also install:
 
@@ -23,10 +22,10 @@ For encoding, also install:
 - libopus
 - libogg
 - TagLib with the C binding, usually provided as `taglib` / `taglib_c`
+- libsoxr, used by `resampler.rkt` and encoder-side PCM sample-rate conversion
 
 The Opus encoder backend uses libopusenc directly.  The FLAC encoder backend
-uses libFLAC directly.  FLAC sample-rate conversion uses the existing FFmpeg
-swresample layer.  Metadata and cover-art copying use the TagLib wrapper; the
+uses libFLAC directly.  FLAC sample-rate conversion uses `resampler.rkt`, backed by libsoxr.  Metadata and cover-art copying use the TagLib wrapper; the
 public `taglib.rkt` API also supports read-write tag editing.
 
 
@@ -43,7 +42,7 @@ sudo apt install \
   ffmpeg \
   libavutil-dev libavcodec-dev libavformat-dev libswresample-dev \
   libogg-dev libopus-dev libopusenc-dev libopusfile-dev \
-  libtag1-dev
+  libsoxr-dev libtag1-dev
 ```
 
 For Opus encoding, `libopusenc-dev` is required.  For Opus decoding through
@@ -60,6 +59,7 @@ brew install mpg123
 brew install ffmpeg
 brew install opus
 brew install libopusenc
+brew install libsoxr
 brew install taglib
 ```