From 81208d78acb260c7c2e6debc765042dd5e98f862 Mon Sep 17 00:00:00 2001 From: Max Kellermann Date: Tue, 20 Mar 2012 01:01:12 +0100 Subject: pcm_dsd: implement DSD to 24 bit USB conversion Implements the dCS suggested standard: http://www.dcsltd.co.uk/page/assets/DSDoverUSB.pdf --- src/pcm_dsd_usb.h | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 src/pcm_dsd_usb.h (limited to 'src/pcm_dsd_usb.h') diff --git a/src/pcm_dsd_usb.h b/src/pcm_dsd_usb.h new file mode 100644 index 00000000..3e7ad8fa --- /dev/null +++ b/src/pcm_dsd_usb.h @@ -0,0 +1,41 @@ +/* + * Copyright (C) 2003-2012 The Music Player Daemon Project + * http://www.musicpd.org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#ifndef MPD_PCM_DSD_USB_H +#define MPD_PCM_DSD_USB_H + +#include "check.h" + +#include +#include +#include + +struct pcm_buffer; + +/** + * Pack DSD 1 bit samples into (padded) 24 bit PCM samples for + * playback over USB, according to the dCS suggested standard: + * http://www.dcsltd.co.uk/page/assets/DSDoverUSB.pdf + */ +const uint32_t * +pcm_dsd_to_usb(struct pcm_buffer *buffer, unsigned channels, + const uint8_t *src, size_t src_size, + size_t *dest_size_r); + +#endif -- cgit v1.2.3