[pkgsrc/trunk]: pkgsrc/audio Import audio/alac from wip

[js <js%pkgsrc.org@localhost>]

details:   https://anonhg.NetBSD.org/pkgsrc/rev/12bd10914989
branches:  trunk
changeset: 429027:12bd10914989
user:      js <js%pkgsrc.org@localhost>
date:      Tue Apr 14 22:33:14 2020 +0000

description:
Import audio/alac from wip

A basic decoder for Apple Lossless Audio Codec files.

diffstat:

 audio/Makefile      |   3 ++-
 audio/alac/DESCR    |  21 +++++++++++++++++++++
 audio/alac/Makefile |  21 +++++++++++++++++++++
 audio/alac/PLIST    |   2 ++
 audio/alac/distinfo |   6 ++++++
 5 files changed, 52 insertions(+), 1 deletions(-)

diffs (83 lines):

diff -r b819b4ec1e70 -r 12bd10914989 audio/Makefile
--- a/audio/Makefile    Tue Apr 14 22:14:09 2020 +0000
+++ b/audio/Makefile    Tue Apr 14 22:33:14 2020 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: Makefile,v 1.593 2020/04/14 04:36:39 tpaul Exp $
+# $NetBSD: Makefile,v 1.594 2020/04/14 22:33:14 js Exp $
 #
 
 COMMENT=       Audio tools
@@ -12,6 +12,7 @@
 SUBDIR+=       adplug
 SUBDIR+=       aeneas
 SUBDIR+=       aiomixer
+SUBDIR+=       alac
 SUBDIR+=       alacconvert
 SUBDIR+=       alsa-lib
 SUBDIR+=       alsa-plugins-oss
diff -r b819b4ec1e70 -r 12bd10914989 audio/alac/DESCR
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/audio/alac/DESCR  Tue Apr 14 22:33:14 2020 +0000
@@ -0,0 +1,21 @@
+Located here is a basic decoder for Apple Lossless Audio Codec files
+(ALAC). ALAC is a proprietary lossless audio compression scheme. Apple
+never released any documents on the format.
+What I provide here is a C implementation of a decoder, written from
+reverse engineering the file format. It turns out that most of the
+algorithms in the codec are fairly well known. ALAC uses an adaptive FIR
+prediction algorithm and stores the error values using a modified rice
+or golumb algorithm. Further details are in alac.c.
+
+Although an encoder is not provided, by using the decoder as a sort of
+specification it should be fairly trivial to write an encoder. By
+exploiting other lossless audio encoders, such as FLAC, the task will be
+much easier. Although one wouldn't be able to copy the compression
+algorithms verbatim, as adaptive compression is used in ALAC and not in
+FLAC. There are, however, a bunch of academic papers on the issue.
+
+The program located here will not be able to handle all ALAC files, it
+can only handle mono or stereo files. ALAC allows up to 8 channels. It
+should be trivial to finish the implementation once I find files that I
+can test it with. The ALAC decoder supports both 16 and 24 bit sample
+sizes.
diff -r b819b4ec1e70 -r 12bd10914989 audio/alac/Makefile
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/audio/alac/Makefile       Tue Apr 14 22:33:14 2020 +0000
@@ -0,0 +1,21 @@
+# $NetBSD: Makefile,v 1.1 2020/04/14 22:33:14 js Exp $
+
+DISTNAME=      alac_decoder-0.2.0
+CATEGORIES=    audio
+MASTER_SITES=  https://web.archive.org/web/20150510210401if_/http://craz.net/programs/itunes/files/
+EXTRACT_SUFX=  .tgz
+
+MAINTAINER=    js%pkgsrc.org@localhost
+HOMEPAGE=      https://web.archive.org/web/20150319040222/craz.net/programs/itunes/alac.html
+COMMENT=       Basic decoder for Apple Lossless Audio Codec files (ALAC)
+LICENSE=       mit
+
+WRKSRC=                ${WRKDIR}/alac_decoder
+BUILD_TARGET=  alac
+
+INSTALLATION_DIRS+=    bin
+
+do-install:
+       ${INSTALL_PROGRAM} ${WRKSRC}/alac ${DESTDIR}${PREFIX}/bin/alac
+
+.include "../../mk/bsd.pkg.mk"
diff -r b819b4ec1e70 -r 12bd10914989 audio/alac/PLIST
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/audio/alac/PLIST  Tue Apr 14 22:33:14 2020 +0000
@@ -0,0 +1,2 @@
+@comment $NetBSD: PLIST,v 1.1 2020/04/14 22:33:14 js Exp $
+bin/alac
diff -r b819b4ec1e70 -r 12bd10914989 audio/alac/distinfo
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/audio/alac/distinfo       Tue Apr 14 22:33:14 2020 +0000
@@ -0,0 +1,6 @@
+$NetBSD: distinfo,v 1.1 2020/04/14 22:33:14 js Exp $
+
+SHA1 (alac_decoder-0.2.0.tgz) = a620f6293ef2d9490927d21ec341bbeff13eabe8
+RMD160 (alac_decoder-0.2.0.tgz) = 72664dff4eeff6e484314f625f74337e60ba39fb
+SHA512 (alac_decoder-0.2.0.tgz) = 4b37d4fe37681bfccaa4a27fbaf11eb2a1fba5f14e77d219a6d9814ff44d1168534d05eb19443dd2fd11e6fcdf4da3a22e3f3c79314cb7a6767c152351b13e29
+Size (alac_decoder-0.2.0.tgz) = 19019 bytes