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-rw-r--r--src/pcm/Volume.cxx189
1 files changed, 189 insertions, 0 deletions
diff --git a/src/pcm/Volume.cxx b/src/pcm/Volume.cxx
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index 000000000..b12d8fd41
--- /dev/null
+++ b/src/pcm/Volume.cxx
@@ -0,0 +1,189 @@
+/*
+ * Copyright (C) 2003-2014 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 "Volume.hxx"
+#include "Domain.hxx"
+#include "PcmUtils.hxx"
+#include "Traits.hxx"
+#include "util/ConstBuffer.hxx"
+#include "util/Error.hxx"
+
+#include "PcmDither.cxx" // including the .cxx file to get inlined templates
+
+#include <stdint.h>
+#include <string.h>
+
+template<SampleFormat F, class Traits=SampleTraits<F>>
+static inline typename Traits::value_type
+pcm_volume_sample(PcmDither &dither,
+ typename Traits::value_type _sample,
+ int volume)
+{
+ typename Traits::long_type sample(_sample);
+
+ return dither.DitherShift<typename Traits::long_type,
+ Traits::BITS + PCM_VOLUME_BITS,
+ Traits::BITS>(sample * volume);
+}
+
+template<SampleFormat F, class Traits=SampleTraits<F>>
+static void
+pcm_volume_change(PcmDither &dither,
+ typename Traits::pointer_type dest,
+ typename Traits::const_pointer_type src,
+ size_t n,
+ int volume)
+{
+ for (size_t i = 0; i != n; ++i)
+ dest[i] = pcm_volume_sample<F, Traits>(dither, src[i], volume);
+}
+
+static void
+pcm_volume_change_8(PcmDither &dither,
+ int8_t *dest, const int8_t *src, size_t n,
+ int volume)
+{
+ pcm_volume_change<SampleFormat::S8>(dither, dest, src, n, volume);
+}
+
+static void
+pcm_volume_change_16(PcmDither &dither,
+ int16_t *dest, const int16_t *src, size_t n,
+ int volume)
+{
+ pcm_volume_change<SampleFormat::S16>(dither, dest, src, n, volume);
+}
+
+static void
+pcm_volume_change_24(PcmDither &dither,
+ int32_t *dest, const int32_t *src, size_t n,
+ int volume)
+{
+ pcm_volume_change<SampleFormat::S24_P32>(dither, dest, src, n,
+ volume);
+}
+
+static void
+pcm_volume_change_32(PcmDither &dither,
+ int32_t *dest, const int32_t *src, size_t n,
+ int volume)
+{
+ pcm_volume_change<SampleFormat::S32>(dither, dest, src, n, volume);
+}
+
+static void
+pcm_volume_change_float(float *dest, const float *src, size_t n,
+ float volume)
+{
+ for (size_t i = 0; i != n; ++i)
+ dest[i] = src[i] * volume;
+}
+
+bool
+PcmVolume::Open(SampleFormat _format, Error &error)
+{
+ assert(format == SampleFormat::UNDEFINED);
+
+ switch (_format) {
+ case SampleFormat::UNDEFINED:
+ error.Format(pcm_domain,
+ "Software volume for %s is not implemented",
+ sample_format_to_string(_format));
+ return false;
+
+ case SampleFormat::S8:
+ case SampleFormat::S16:
+ case SampleFormat::S24_P32:
+ case SampleFormat::S32:
+ case SampleFormat::FLOAT:
+ break;
+
+ case SampleFormat::DSD:
+ // TODO: implement this; currently, it's a no-op
+ break;
+ }
+
+ format = _format;
+ return true;
+}
+
+ConstBuffer<void>
+PcmVolume::Apply(ConstBuffer<void> src)
+{
+ if (volume == PCM_VOLUME_1)
+ return src;
+
+ void *data = buffer.Get(src.size);
+
+ if (volume == 0) {
+ /* optimized special case: 0% volume = memset(0) */
+ /* TODO: is this valid for all sample formats? What
+ about floating point? */
+ memset(data, 0, src.size);
+ return { data, src.size };
+ }
+
+ switch (format) {
+ case SampleFormat::UNDEFINED:
+ assert(false);
+ gcc_unreachable();
+
+ case SampleFormat::S8:
+ pcm_volume_change_8(dither, (int8_t *)data,
+ (const int8_t *)src.data,
+ src.size / sizeof(int8_t),
+ volume);
+ break;
+
+ case SampleFormat::S16:
+ pcm_volume_change_16(dither, (int16_t *)data,
+ (const int16_t *)src.data,
+ src.size / sizeof(int16_t),
+ volume);
+ break;
+
+ case SampleFormat::S24_P32:
+ pcm_volume_change_24(dither, (int32_t *)data,
+ (const int32_t *)src.data,
+ src.size / sizeof(int32_t),
+ volume);
+ break;
+
+ case SampleFormat::S32:
+ pcm_volume_change_32(dither, (int32_t *)data,
+ (const int32_t *)src.data,
+ src.size / sizeof(int32_t),
+ volume);
+ break;
+
+ case SampleFormat::FLOAT:
+ pcm_volume_change_float((float *)data,
+ (const float *)src.data,
+ src.size / sizeof(float),
+ pcm_volume_to_float(volume));
+ break;
+
+ case SampleFormat::DSD:
+ // TODO: implement this; currently, it's a no-op
+ return src;
+ }
+
+ return { data, src.size };
+}