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authorMax Kellermann <max@duempel.org>2012-03-20 01:01:12 +0100
committerMax Kellermann <max@duempel.org>2012-03-22 01:14:51 +0100
commit81208d78acb260c7c2e6debc765042dd5e98f862 (patch)
tree32993048254599ac9d5dfb26a0ac182863d5db73 /src/pcm_dsd_usb.h
parentda8b01771ff425dd30dca1cb8a8fe943d2ecc90b (diff)
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pcm_dsd: implement DSD to 24 bit USB conversion
Implements the dCS suggested standard: http://www.dcsltd.co.uk/page/assets/DSDoverUSB.pdf
Diffstat (limited to 'src/pcm_dsd_usb.h')
-rw-r--r--src/pcm_dsd_usb.h41
1 files changed, 41 insertions, 0 deletions
diff --git a/src/pcm_dsd_usb.h b/src/pcm_dsd_usb.h
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+/*
+ * 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 <stdbool.h>
+#include <stdint.h>
+#include <stddef.h>
+
+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