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-rw-r--r--src/pcm/Order.cxx135
-rw-r--r--src/pcm/Order.hxx37
-rw-r--r--src/pcm/PcmExport.cxx9
-rw-r--r--src/pcm/PcmExport.hxx18
4 files changed, 199 insertions, 0 deletions
diff --git a/src/pcm/Order.cxx b/src/pcm/Order.cxx
new file mode 100644
index 000000000..470f9d119
--- /dev/null
+++ b/src/pcm/Order.cxx
@@ -0,0 +1,135 @@
+/*
+ * Copyright (C) 2003-2015 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.
+ */
+
+#include "config.h"
+#include "Order.hxx"
+#include "PcmBuffer.hxx"
+#include "util/ConstBuffer.hxx"
+
+template<typename V>
+struct TwoPointers {
+ V *dest;
+ const V *src;
+
+ TwoPointers<V> &CopyOne() {
+ *dest++ = *src++;
+ return *this;
+ }
+
+ TwoPointers<V> &CopyTwo() {
+ return CopyOne().CopyOne();
+ }
+
+ TwoPointers<V> &SwapTwoPairs() {
+ *dest++ = src[2];
+ *dest++ = src[3];
+ *dest++ = src[0];
+ *dest++ = src[1];
+ src += 4;
+ return *this;
+ }
+
+ TwoPointers<V> &ToAlsa51() {
+ return CopyTwo() // left+right
+ .SwapTwoPairs(); // center, LFE, surround left+right
+ }
+
+ TwoPointers<V> &ToAlsa71() {
+ return ToAlsa51()
+ .CopyTwo(); // side left+right
+ }
+};
+
+template<typename V>
+static void
+ToAlsaChannelOrder51(V *dest, const V *src, size_t n)
+{
+ TwoPointers<V> p{dest, src};
+ for (size_t i = 0; i != n; ++i)
+ p.ToAlsa51();
+}
+
+template<typename V>
+static inline ConstBuffer<V>
+ToAlsaChannelOrder51(PcmBuffer &buffer, ConstBuffer<V> src)
+{
+ auto dest = buffer.GetT<V>(src.size);
+ ToAlsaChannelOrder51(dest, src.data, src.size / 6);
+ return { dest, src.size };
+}
+
+template<typename V>
+static void
+ToAlsaChannelOrder71(V *dest, const V *src, size_t n)
+{
+ TwoPointers<V> p{dest, src};
+ for (size_t i = 0; i != n; ++i)
+ p.ToAlsa71();
+}
+
+template<typename V>
+static inline ConstBuffer<V>
+ToAlsaChannelOrder71(PcmBuffer &buffer, ConstBuffer<V> src)
+{
+ auto dest = buffer.GetT<V>(src.size);
+ ToAlsaChannelOrder71(dest, src.data, src.size / 6);
+ return { dest, src.size };
+}
+
+template<typename V>
+static ConstBuffer<V>
+ToAlsaChannelOrderT(PcmBuffer &buffer, ConstBuffer<V> src, unsigned channels)
+{
+ switch (channels) {
+ case 6: // 5.1
+ return ToAlsaChannelOrder51(buffer, src);
+
+ case 8: // 7.1
+ return ToAlsaChannelOrder71(buffer, src);
+
+ default:
+ return src;
+ }
+}
+
+ConstBuffer<void>
+ToAlsaChannelOrder(PcmBuffer &buffer, ConstBuffer<void> src,
+ SampleFormat sample_format, unsigned channels)
+{
+ switch (sample_format) {
+ case SampleFormat::UNDEFINED:
+ case SampleFormat::S8:
+ case SampleFormat::DSD:
+ return src;
+
+ case SampleFormat::S16:
+ return ToAlsaChannelOrderT(buffer,
+ ConstBuffer<int16_t>::FromVoid(src),
+ channels).ToVoid();
+
+ case SampleFormat::S24_P32:
+ case SampleFormat::S32:
+ case SampleFormat::FLOAT:
+ return ToAlsaChannelOrderT(buffer,
+ ConstBuffer<int32_t>::FromVoid(src),
+ channels).ToVoid();
+ }
+
+ gcc_unreachable();
+}
diff --git a/src/pcm/Order.hxx b/src/pcm/Order.hxx
new file mode 100644
index 000000000..14bfa2382
--- /dev/null
+++ b/src/pcm/Order.hxx
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2003-2015 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_ORDER_HXX
+#define MPD_PCM_ORDER_HXX
+
+#include "check.h"
+#include "AudioFormat.hxx"
+
+class PcmBuffer;
+template<typename T> struct ConstBuffer;
+
+/**
+ * Convert the given buffer from FLAC channel order
+ * (https://xiph.org/flac/format.html) to ALSA channel order.
+ */
+ConstBuffer<void>
+ToAlsaChannelOrder(PcmBuffer &buffer, ConstBuffer<void> src,
+ SampleFormat sample_format, unsigned channels);
+
+#endif
diff --git a/src/pcm/PcmExport.cxx b/src/pcm/PcmExport.cxx
index af2eb7d9f..0bf4f8be8 100644
--- a/src/pcm/PcmExport.cxx
+++ b/src/pcm/PcmExport.cxx
@@ -19,6 +19,7 @@
#include "config.h"
#include "PcmExport.hxx"
+#include "Order.hxx"
#include "PcmDop.hxx"
#include "PcmPack.hxx"
#include "util/ByteReverse.hxx"
@@ -28,12 +29,16 @@
void
PcmExport::Open(SampleFormat sample_format, unsigned _channels,
+ bool _alsa_channel_order,
bool _dop, bool _shift8, bool _pack, bool _reverse_endian)
{
assert(audio_valid_sample_format(sample_format));
assert(!_dop || audio_valid_channel_count(_channels));
channels = _channels;
+ alsa_channel_order = _alsa_channel_order
+ ? sample_format
+ : SampleFormat::UNDEFINED;
dop = _dop && sample_format == SampleFormat::DSD;
if (dop)
/* after the conversion to DoP, the DSD
@@ -77,6 +82,10 @@ PcmExport::GetFrameSize(const AudioFormat &audio_format) const
ConstBuffer<void>
PcmExport::Export(ConstBuffer<void> data)
{
+ if (alsa_channel_order != SampleFormat::UNDEFINED)
+ data = ToAlsaChannelOrder(order_buffer, data,
+ alsa_channel_order, channels);
+
if (dop)
data = pcm_dsd_to_dop(dop_buffer, channels,
ConstBuffer<uint8_t>::FromVoid(data))
diff --git a/src/pcm/PcmExport.hxx b/src/pcm/PcmExport.hxx
index 7265ca07d..aafa1cea0 100644
--- a/src/pcm/PcmExport.hxx
+++ b/src/pcm/PcmExport.hxx
@@ -34,6 +34,13 @@ template<typename T> struct ConstBuffer;
*/
struct PcmExport {
/**
+ * This buffer is used to reorder channels.
+ *
+ * @see #alsa_channel_order
+ */
+ PcmBuffer order_buffer;
+
+ /**
* The buffer is used to convert DSD samples to the
* DoP format.
*
@@ -61,6 +68,16 @@ struct PcmExport {
uint8_t channels;
/**
+ * Convert the given buffer from FLAC channel order to ALSA
+ * channel order using ToAlsaChannelOrder()?
+ *
+ * If this value is SampleFormat::UNDEFINED, then no channel
+ * reordering is applied, otherwise this is the input sample
+ * format.
+ */
+ SampleFormat alsa_channel_order;
+
+ /**
* Convert DSD to DSD-over-PCM (DoP)? Input format must be
* SampleFormat::DSD and output format must be
* SampleFormat::S24_P32.
@@ -96,6 +113,7 @@ struct PcmExport {
* @param channels the number of channels; ignored unless dop is set
*/
void Open(SampleFormat sample_format, unsigned channels,
+ bool _alsa_channel_order,
bool dop, bool shift8, bool pack, bool reverse_endian);
/**
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-26 13:46:48 +0000