1 files changed, 97 insertions, 0 deletions
diff --git a/src/pcm/PcmChannels.hxx b/src/pcm/PcmChannels.hxx
new file mode 100644
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+++ b/src/pcm/PcmChannels.hxx
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+/*
+ * Copyright (C) 2003-2013 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_CHANNELS_HXX
+#define MPD_PCM_CHANNELS_HXX
+
+#include <stdint.h>
+#include <stddef.h>
+
+struct PcmBuffer;
+
+/**
+ * Changes the number of channels in 16 bit PCM data.
+ *
+ * @param buffer the destination pcm_buffer object
+ * @param dest_channels the number of channels requested
+ * @param src_channels the number of channels in the source buffer
+ * @param src the source PCM buffer
+ * @param src_size the number of bytes in #src
+ * @param dest_size_r returns the number of bytes of the destination buffer
+ * @return the destination buffer
+ */
+const int16_t *
+pcm_convert_channels_16(PcmBuffer &buffer,
+			unsigned dest_channels,
+			unsigned src_channels, const int16_t *src,
+			size_t src_size, size_t *dest_size_r);
+
+/**
+ * Changes the number of channels in 24 bit PCM data (aligned at 32
+ * bit boundaries).
+ *
+ * @param buffer the destination pcm_buffer object
+ * @param dest_channels the number of channels requested
+ * @param src_channels the number of channels in the source buffer
+ * @param src the source PCM buffer
+ * @param src_size the number of bytes in #src
+ * @param dest_size_r returns the number of bytes of the destination buffer
+ * @return the destination buffer
+ */
+const int32_t *
+pcm_convert_channels_24(PcmBuffer &buffer,
+			unsigned dest_channels,
+			unsigned src_channels, const int32_t *src,
+			size_t src_size, size_t *dest_size_r);
+
+/**
+ * Changes the number of channels in 32 bit PCM data.
+ *
+ * @param buffer the destination pcm_buffer object
+ * @param dest_channels the number of channels requested
+ * @param src_channels the number of channels in the source buffer
+ * @param src the source PCM buffer
+ * @param src_size the number of bytes in #src
+ * @param dest_size_r returns the number of bytes of the destination buffer
+ * @return the destination buffer
+ */
+const int32_t *
+pcm_convert_channels_32(PcmBuffer &buffer,
+			unsigned dest_channels,
+			unsigned src_channels, const int32_t *src,
+			size_t src_size, size_t *dest_size_r);
+
+/**
+ * Changes the number of channels in 32 bit float PCM data.
+ *
+ * @param buffer the destination pcm_buffer object
+ * @param dest_channels the number of channels requested
+ * @param src_channels the number of channels in the source buffer
+ * @param src the source PCM buffer
+ * @param src_size the number of bytes in #src
+ * @param dest_size_r returns the number of bytes of the destination buffer
+ * @return the destination buffer
+ */
+const float *
+pcm_convert_channels_float(PcmBuffer &buffer,
+			   unsigned dest_channels,
+			   unsigned src_channels, const float *src,
+			   size_t src_size, size_t *dest_size_r);
+
+#endif