doc: add pw-v4l2.1 and spa-*.1

Add manpages for the remaining utilities without one.

doc/dox/programs/spa-resample.1.md

@@ -0,0 +1,47 @@
+\page page_man_spa-resample_1 spa-resample
+
+The PipeWire resampler debugging utility
+
+# SYNOPSIS
+
+**spa-resample** \[*OPTIONS*\] *INFILE* *OUTFILE*
+
+# DESCRIPTION
+
+Use the PipeWire resampler to resample input file to output file,
+following the given options.
+
+This is useful only for testing the resampler.
+
+# OPTIONS
+
+\par -r RATE | \--rate=RATE
+Output sample rate.
+
+\par -f FORMAT | \--format=FORMAT
+Output sample format (s8 | s16 | s32 | f32 | f64).
+
+\par -q QUALITY | \--quality=QUALITY
+Resampler output quality (0-14).
+
+\par -c FLAGS | \--cpuflags=FLAGS
+See \ref spa_cpu "spa/support/cpu.h".
+
+\par -h
+Show help.
+
+\par -v
+Verbose operation.
+
+# EXAMPLES
+
+**spa-resample** -r 48000 -f s32 in.wav out.wav
+
+# AUTHORS
+
+The PipeWire Developers <$(PACKAGE_BUGREPORT)>;
+PipeWire is available from <$(PACKAGE_URL)>
+
+# SEE ALSO
+
+\ref page_man_pipewire_1 "pipewire(1)"