Christos Margiolis 1728d26682 sound: Implement AFMT_FLOAT support ... Even though the OSS manual [1] advises against using AFMT_FLOAT, there are applications that expect the sound driver to support it, and might not work properly without it. This patch adds AFMT_F32_LE|BE (as well as AFMT_FLOAT for OSS compatibility) in sys/soundcard.h and implements AFMT_F32_LE|BE <-> AFMT_S32_LE|BE conversion functions. As a result, applications can write/read floats to/from sound(4), but internally, because sound(4) works with integers, we convert floating point samples to integer ones, before doing any processing. The reason for encoding/decoding IEEE754s manually, instead of using fpu_kern(9), is that fpu_kern(9) is not supported by all architectures, and also introduces significant overhead. The IEEE754 encoding/decoding implementation has been written by Ariff Abdullah [2]. [1] http://manuals.opensound.com/developer/AFMT_FLOAT.html [2] https://people.freebsd.org/~ariff/utils/ieee754.c PR: 157050, 184380, 264973, 280612, 281390 Sponsored by: The FreeBSD Foundation MFC after: 1 week Reviewed by: emaste Differential Revision: https://reviews.freebsd.org/D47638 (cherry picked from commit e1bbaa71d62c8681a576f9f5bedf475c7541bd35)		2025-04-06 02:28:14 +02:00
..
Makefile	sound: Unit test the pcm sample read and write macros	2025-01-28 16:04:52 +02:00
pcm_read_write.c	sound: Implement AFMT_FLOAT support	2025-04-06 02:28:14 +02:00
sndstat.c