pcm_resample: convert to C++

9 files changed, 261 insertions, 316 deletions

diff --git a/src/Main.cxx b/src/Main.cxx
index aa0a687fd..ff957c1ee 100644
--- a/src/Main.cxx
+++ b/src/Main.cxx
@@ -53,11 +53,11 @@
 #include "ZeroconfGlue.hxx"
 #include "DecoderList.hxx"
 #include "AudioConfig.hxx"
+#include "pcm/PcmResample.hxx"
 
 extern "C" {
 #include "daemon.h"
 #include "stats.h"
-#include "pcm/pcm_resample.h"
 }
 
 #include "mpd_error.h"
diff --git a/src/pcm/PcmConvert.cxx b/src/pcm/PcmConvert.cxx
index 0a3fa6816..d280101b5 100644
--- a/src/pcm/PcmConvert.cxx
+++ b/src/pcm/PcmConvert.cxx
@@ -34,16 +34,12 @@
 
 PcmConvert::PcmConvert()
 {
-	pcm_resample_init(&resample);
-
 	pcm_buffer_init(&format_buffer);
 	pcm_buffer_init(&channels_buffer);
 }
 
 PcmConvert::~PcmConvert()
 {
-	pcm_resample_deinit(&resample);
-
 	pcm_buffer_deinit(&format_buffer);
 	pcm_buffer_deinit(&channels_buffer);
 }
@@ -52,7 +48,7 @@ void
 PcmConvert::Reset()
 {
 	dsd.Reset();
-	pcm_resample_reset(&resample);
+	resampler.Reset();
 }
 
 inline const int16_t *
@@ -93,11 +89,10 @@ PcmConvert::Convert16(const audio_format *src_format,
 	}
 
 	if (src_format->sample_rate != dest_format->sample_rate) {
-		buf = pcm_resample_16(&resample,
-				      dest_format->channels,
-				      src_format->sample_rate, buf, len,
-				      dest_format->sample_rate, &len,
-				      error_r);
+		buf = resampler.Resample16(dest_format->channels,
+					   src_format->sample_rate, buf, len,
+					   dest_format->sample_rate, &len,
+					   error_r);
 		if (buf == NULL)
 			return NULL;
 	}
@@ -143,11 +138,10 @@ PcmConvert::Convert24(const audio_format *src_format,
 	}
 
 	if (src_format->sample_rate != dest_format->sample_rate) {
-		buf = pcm_resample_24(&resample,
-				      dest_format->channels,
-				      src_format->sample_rate, buf, len,
-				      dest_format->sample_rate, &len,
-				      error_r);
+		buf = resampler.Resample24(dest_format->channels,
+					   src_format->sample_rate, buf, len,
+					   dest_format->sample_rate, &len,
+					   error_r);
 		if (buf == NULL)
 			return NULL;
 	}
@@ -193,11 +187,10 @@ PcmConvert::Convert32(const audio_format *src_format,
 	}
 
 	if (src_format->sample_rate != dest_format->sample_rate) {
-		buf = pcm_resample_32(&resample,
-				      dest_format->channels,
-				      src_format->sample_rate, buf, len,
-				      dest_format->sample_rate, &len,
-				      error_r);
+		buf = resampler.Resample32(dest_format->channels,
+					   src_format->sample_rate, buf, len,
+					   dest_format->sample_rate, &len,
+					   error_r);
 		if (buf == NULL)
 			return buf;
 	}
@@ -250,12 +243,11 @@ PcmConvert::ConvertFloat(const audio_format *src_format,
 	   libsamplerate */
 
 	if (src_format->sample_rate != dest_format->sample_rate) {
-		buffer = pcm_resample_float(&resample,
-					    dest_format->channels,
-					    src_format->sample_rate,
-					    buffer, size,
-					    dest_format->sample_rate, &size,
-					    error_r);
+		buffer = resampler.ResampleFloat(dest_format->channels,
+						 src_format->sample_rate,
+						 buffer, size,
+						 dest_format->sample_rate,
+						 &size, error_r);
 		if (buffer == NULL)
 			return NULL;
 	}
diff --git a/src/pcm/PcmConvert.hxx b/src/pcm/PcmConvert.hxx
index 62f67ed8e..1635a90c3 100644
--- a/src/pcm/PcmConvert.hxx
+++ b/src/pcm/PcmConvert.hxx
@@ -22,9 +22,9 @@
 
 #include "PcmDither.hxx"
 #include "PcmDsd.hxx"
+#include "PcmResample.hxx"
 
 extern "C" {
-#include "pcm_resample.h"
 #include "pcm_buffer.h"
 }
 
@@ -40,7 +40,7 @@ struct audio_format;
 class PcmConvert {
 	PcmDsd dsd;
 
-	struct pcm_resample_state resample;
+	PcmResampler resampler;
 
 	PcmDither dither;
 
diff --git a/src/pcm/pcm_resample.c b/src/pcm/PcmResample.cxx
index 4bc057a7e..60265380e 100644
--- a/src/pcm/pcm_resample.c
+++ b/src/pcm/PcmResample.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2011 The Music Player Daemon Project
+ * 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
@@ -18,7 +18,7 @@
  */
 
 #include "config.h"
-#include "pcm_resample_internal.h"
+#include "PcmResampleInternal.hxx"
 
 #ifdef HAVE_LIBSAMPLERATE
 #include "conf.h"
@@ -56,47 +56,43 @@ pcm_resample_global_init(GError **error_r)
 #endif
 }
 
-void pcm_resample_init(struct pcm_resample_state *state)
+PcmResampler::PcmResampler()
 {
 #ifdef HAVE_LIBSAMPLERATE
 	if (pcm_resample_lsr_enabled())
-		pcm_resample_lsr_init(state);
+		pcm_resample_lsr_init(this);
 	else
 #endif
-		pcm_resample_fallback_init(state);
+		pcm_resample_fallback_init(this);
 }
 
-void pcm_resample_deinit(struct pcm_resample_state *state)
+PcmResampler::~PcmResampler()
 {
 #ifdef HAVE_LIBSAMPLERATE
 	if (pcm_resample_lsr_enabled())
-		pcm_resample_lsr_deinit(state);
+		pcm_resample_lsr_deinit(this);
 	else
 #endif
-		pcm_resample_fallback_deinit(state);
+		pcm_resample_fallback_deinit(this);
 }
 
 void
-pcm_resample_reset(struct pcm_resample_state *state)
+PcmResampler::Reset()
 {
 #ifdef HAVE_LIBSAMPLERATE
-	pcm_resample_lsr_reset(state);
-#else
-	(void)state;
+	pcm_resample_lsr_reset(this);
 #endif
 }
 
 const float *
-pcm_resample_float(struct pcm_resample_state *state,
-		   unsigned channels,
-		   unsigned src_rate,
-		   const float *src_buffer, size_t src_size,
-		   unsigned dest_rate, size_t *dest_size_r,
-		   GError **error_r)
+PcmResampler::ResampleFloat(unsigned channels, unsigned src_rate,
+			    const float *src_buffer, size_t src_size,
+			    unsigned dest_rate, size_t *dest_size_r,
+			    GError **error_r)
 {
 #ifdef HAVE_LIBSAMPLERATE
 	if (pcm_resample_lsr_enabled())
-		return pcm_resample_lsr_float(state, channels,
+		return pcm_resample_lsr_float(this, channels,
 					      src_rate, src_buffer, src_size,
 					      dest_rate, dest_size_r,
 					      error_r);
@@ -108,22 +104,21 @@ pcm_resample_float(struct pcm_resample_state *state,
 	   not do any math on the sample values, so this hack is
 	   possible: */
 	return (const float *)
-		pcm_resample_fallback_32(state, channels,
+		pcm_resample_fallback_32(this, channels,
 					 src_rate, (const int32_t *)src_buffer,
 					 src_size,
 					 dest_rate, dest_size_r);
 }
 
 const int16_t *
-pcm_resample_16(struct pcm_resample_state *state,
-		unsigned channels,
-		unsigned src_rate, const int16_t *src_buffer, size_t src_size,
-		unsigned dest_rate, size_t *dest_size_r,
-		GError **error_r)
+PcmResampler::Resample16(unsigned channels,
+			 unsigned src_rate, const int16_t *src_buffer, size_t src_size,
+			 unsigned dest_rate, size_t *dest_size_r,
+			 GError **error_r)
 {
 #ifdef HAVE_LIBSAMPLERATE
 	if (pcm_resample_lsr_enabled())
-		return pcm_resample_lsr_16(state, channels,
+		return pcm_resample_lsr_16(this, channels,
 					   src_rate, src_buffer, src_size,
 					   dest_rate, dest_size_r,
 					   error_r);
@@ -131,21 +126,20 @@ pcm_resample_16(struct pcm_resample_state *state,
 	(void)error_r;
 #endif
 
-	return pcm_resample_fallback_16(state, channels,
+	return pcm_resample_fallback_16(this, channels,
 					src_rate, src_buffer, src_size,
 					dest_rate, dest_size_r);
 }
 
 const int32_t *
-pcm_resample_32(struct pcm_resample_state *state,
-		unsigned channels,
-		unsigned src_rate, const int32_t *src_buffer, size_t src_size,
-		unsigned dest_rate, size_t *dest_size_r,
-		GError **error_r)
+PcmResampler::Resample32(unsigned channels, unsigned src_rate,
+			 const int32_t *src_buffer, size_t src_size,
+			 unsigned dest_rate, size_t *dest_size_r,
+			 GError **error_r)
 {
 #ifdef HAVE_LIBSAMPLERATE
 	if (pcm_resample_lsr_enabled())
-		return pcm_resample_lsr_32(state, channels,
+		return pcm_resample_lsr_32(this, channels,
 					   src_rate, src_buffer, src_size,
 					   dest_rate, dest_size_r,
 					   error_r);
@@ -153,7 +147,7 @@ pcm_resample_32(struct pcm_resample_state *state,
 	(void)error_r;
 #endif
 
-	return pcm_resample_fallback_32(state, channels,
+	return pcm_resample_fallback_32(this, channels,
 					src_rate, src_buffer, src_size,
 					dest_rate, dest_size_r);
 }
diff --git a/src/pcm/PcmResample.hxx b/src/pcm/PcmResample.hxx
new file mode 100644
index 000000000..6aaa75014
--- /dev/null
+++ b/src/pcm/PcmResample.hxx
@@ -0,0 +1,138 @@
+/*
+ * 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_RESAMPLE_HXX
+#define MPD_PCM_RESAMPLE_HXX
+
+#include "check.h"
+#include "pcm_buffer.h"
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdbool.h>
+
+#ifdef HAVE_LIBSAMPLERATE
+#include <samplerate.h>
+#endif
+
+/**
+ * This object is statically allocated (within another struct), and
+ * holds buffer allocations and the state for the resampler.
+ */
+struct PcmResampler {
+#ifdef HAVE_LIBSAMPLERATE
+	SRC_STATE *state;
+	SRC_DATA data;
+
+	struct pcm_buffer in, out;
+
+	struct {
+		unsigned src_rate;
+		unsigned dest_rate;
+		unsigned channels;
+	} prev;
+
+	int error;
+#endif
+
+	struct pcm_buffer buffer;
+
+	PcmResampler();
+	~PcmResampler();
+
+	/**
+	 * @see pcm_convert_reset()
+	 */
+	void Reset();
+
+	/**
+	 * Resamples 32 bit float data.
+	 *
+	 * @param channels the number of channels
+	 * @param src_rate the source sample rate
+	 * @param src the source PCM buffer
+	 * @param src_size the size of #src in bytes
+	 * @param dest_rate the requested destination sample rate
+	 * @param dest_size_r returns the number of bytes of the destination buffer
+	 * @return the destination buffer
+	 */
+	const float *ResampleFloat(unsigned channels, unsigned src_rate,
+				   const float *src_buffer, size_t src_size,
+				   unsigned dest_rate, size_t *dest_size_r,
+				   GError **error_r);
+
+	/**
+	 * Resamples 16 bit PCM data.
+	 *
+	 * @param channels the number of channels
+	 * @param src_rate the source sample rate
+	 * @param src the source PCM buffer
+	 * @param src_size the size of #src in bytes
+	 * @param dest_rate the requested destination sample rate
+	 * @param dest_size_r returns the number of bytes of the destination buffer
+	 * @return the destination buffer
+	 */
+	const int16_t *Resample16(unsigned channels, unsigned src_rate,
+				  const int16_t *src_buffer, size_t src_size,
+				  unsigned dest_rate, size_t *dest_size_r,
+				  GError **error_r);
+
+	/**
+	 * Resamples 32 bit PCM data.
+	 *
+	 * @param channels the number of channels
+	 * @param src_rate the source sample rate
+	 * @param src the source PCM buffer
+	 * @param src_size the size of #src in bytes
+	 * @param dest_rate the requested destination sample rate
+	 * @param dest_size_r returns the number of bytes of the destination buffer
+	 * @return the destination buffer
+	 */
+	const int32_t *Resample32(unsigned channels, unsigned src_rate,
+				  const int32_t *src_buffer, size_t src_size,
+				  unsigned dest_rate, size_t *dest_size_r,
+				  GError **error_r);
+
+	/**
+	 * Resamples 24 bit PCM data.
+	 *
+	 * @param channels the number of channels
+	 * @param src_rate the source sample rate
+	 * @param src the source PCM buffer
+	 * @param src_size the size of #src in bytes
+	 * @param dest_rate the requested destination sample rate
+	 * @param dest_size_r returns the number of bytes of the destination buffer
+	 * @return the destination buffer
+	 */
+	const int32_t *Resample24(unsigned channels, unsigned src_rate,
+				  const int32_t *src_buffer, size_t src_size,
+				  unsigned dest_rate, size_t *dest_size_r,
+				  GError **error_r)
+	{
+		/* reuse the 32 bit code - the resampler code doesn't care if
+		   the upper 8 bits are actually used */
+		return Resample32(channels, src_rate, src_buffer, src_size,
+				  dest_rate, dest_size_r, error_r);
+	}
+};
+
+bool
+pcm_resample_global_init(GError **error_r);
+
+#endif
diff --git a/src/pcm/pcm_resample_fallback.c b/src/pcm/PcmResampleFallback.cxx
index 1d1dfdf59..724894366 100644
--- a/src/pcm/pcm_resample_fallback.c
+++ b/src/pcm/PcmResampleFallback.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2011 The Music Player Daemon Project
+ * 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
@@ -18,52 +18,53 @@
  */
 
 #include "config.h"
-#include "pcm_resample_internal.h"
+#include "PcmResampleInternal.hxx"
 
 #include <assert.h>
 
 void
-pcm_resample_fallback_init(struct pcm_resample_state *state)
+pcm_resample_fallback_init(PcmResampler *state)
 {
 	pcm_buffer_init(&state->buffer);
 }
 
 void
-pcm_resample_fallback_deinit(struct pcm_resample_state *state)
+pcm_resample_fallback_deinit(PcmResampler *state)
 {
 	pcm_buffer_deinit(&state->buffer);
 }
 
 /* resampling code blatantly ripped from ESD */
 const int16_t *
-pcm_resample_fallback_16(struct pcm_resample_state *state,
+pcm_resample_fallback_16(PcmResampler *state,
 			 unsigned channels,
 			 unsigned src_rate,
 			 const int16_t *src_buffer, size_t src_size,
 			 unsigned dest_rate,
 			 size_t *dest_size_r)
 {
-	unsigned src_pos, dest_pos = 0;
+	unsigned dest_pos = 0;
 	unsigned src_frames = src_size / channels / sizeof(*src_buffer);
 	unsigned dest_frames =
 		(src_frames * dest_rate + src_rate - 1) / src_rate;
 	unsigned dest_samples = dest_frames * channels;
 	size_t dest_size = dest_samples * sizeof(*src_buffer);
-	int16_t *dest_buffer = pcm_buffer_get(&state->buffer, dest_size);
+	int16_t *dest_buffer = (int16_t *)
+		pcm_buffer_get(&state->buffer, dest_size);
 
 	assert((src_size % (sizeof(*src_buffer) * channels)) == 0);
 
 	switch (channels) {
 	case 1:
 		while (dest_pos < dest_samples) {
-			src_pos = dest_pos * src_rate / dest_rate;
+			unsigned src_pos = dest_pos * src_rate / dest_rate;
 
 			dest_buffer[dest_pos++] = src_buffer[src_pos];
 		}
 		break;
 	case 2:
 		while (dest_pos < dest_samples) {
-			src_pos = dest_pos * src_rate / dest_rate;
+			unsigned src_pos = dest_pos * src_rate / dest_rate;
 			src_pos &= ~1;
 
 			dest_buffer[dest_pos++] = src_buffer[src_pos];
@@ -77,34 +78,35 @@ pcm_resample_fallback_16(struct pcm_resample_state *state,
 }
 
 const int32_t *
-pcm_resample_fallback_32(struct pcm_resample_state *state,
+pcm_resample_fallback_32(PcmResampler *state,
 			 unsigned channels,
 			 unsigned src_rate,
 			 const int32_t *src_buffer, size_t src_size,
 			 unsigned dest_rate,
 			 size_t *dest_size_r)
 {
-	unsigned src_pos, dest_pos = 0;
+	unsigned dest_pos = 0;
 	unsigned src_frames = src_size / channels / sizeof(*src_buffer);
 	unsigned dest_frames =
 		(src_frames * dest_rate + src_rate - 1) / src_rate;
 	unsigned dest_samples = dest_frames * channels;
 	size_t dest_size = dest_samples * sizeof(*src_buffer);
-	int32_t *dest_buffer = pcm_buffer_get(&state->buffer, dest_size);
+	int32_t *dest_buffer = (int32_t *)
+		pcm_buffer_get(&state->buffer, dest_size);
 
 	assert((src_size % (sizeof(*src_buffer) * channels)) == 0);
 
 	switch (channels) {
 	case 1:
 		while (dest_pos < dest_samples) {
-			src_pos = dest_pos * src_rate / dest_rate;
+			unsigned src_pos = dest_pos * src_rate / dest_rate;
 
 			dest_buffer[dest_pos++] = src_buffer[src_pos];
 		}
 		break;
 	case 2:
 		while (dest_pos < dest_samples) {
-			src_pos = dest_pos * src_rate / dest_rate;
+			unsigned src_pos = dest_pos * src_rate / dest_rate;
 			src_pos &= ~1;
 
 			dest_buffer[dest_pos++] = src_buffer[src_pos];
diff --git a/src/pcm/pcm_resample_internal.h b/src/pcm/PcmResampleInternal.hxx
index a0e108d4b..bae69fab4 100644
--- a/src/pcm/pcm_resample_internal.h
+++ b/src/pcm/PcmResampleInternal.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2011 The Music Player Daemon Project
+ * 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
@@ -24,11 +24,11 @@
  * of this header is somewhat unrelated to it.
  */
 
-#ifndef MPD_PCM_RESAMPLE_INTERNAL_H
-#define MPD_PCM_RESAMPLE_INTERNAL_H
+#ifndef MPD_PCM_RESAMPLE_INTERNAL_HXX
+#define MPD_PCM_RESAMPLE_INTERNAL_HXX
 
 #include "check.h"
-#include "pcm_resample.h"
+#include "PcmResample.hxx"
 
 #ifdef HAVE_LIBSAMPLERATE
 
@@ -36,16 +36,16 @@ bool
 pcm_resample_lsr_global_init(const char *converter, GError **error_r);
 
 void
-pcm_resample_lsr_init(struct pcm_resample_state *state);
+pcm_resample_lsr_init(PcmResampler *state);
 
 void
-pcm_resample_lsr_deinit(struct pcm_resample_state *state);
+pcm_resample_lsr_deinit(PcmResampler *state);
 
 void
-pcm_resample_lsr_reset(struct pcm_resample_state *state);
+pcm_resample_lsr_reset(PcmResampler *state);
 
 const float *
-pcm_resample_lsr_float(struct pcm_resample_state *state,
+pcm_resample_lsr_float(PcmResampler *state,
 		       unsigned channels,
 		       unsigned src_rate,
 		       const float *src_buffer, size_t src_size,
@@ -53,7 +53,7 @@ pcm_resample_lsr_float(struct pcm_resample_state *state,
 		       GError **error_r);
 
 const int16_t *
-pcm_resample_lsr_16(struct pcm_resample_state *state,
+pcm_resample_lsr_16(PcmResampler *state,
 		    unsigned channels,
 		    unsigned src_rate,
 		    const int16_t *src_buffer, size_t src_size,
@@ -61,7 +61,7 @@ pcm_resample_lsr_16(struct pcm_resample_state *state,
 		    GError **error_r);
 
 const int32_t *
-pcm_resample_lsr_32(struct pcm_resample_state *state,
+pcm_resample_lsr_32(PcmResampler *state,
 		    unsigned channels,
 		    unsigned src_rate,
 		    const int32_t *src_buffer,
@@ -72,13 +72,13 @@ pcm_resample_lsr_32(struct pcm_resample_state *state,
 #endif
 
 void
-pcm_resample_fallback_init(struct pcm_resample_state *state);
+pcm_resample_fallback_init(PcmResampler *state);
 
 void
-pcm_resample_fallback_deinit(struct pcm_resample_state *state);
+pcm_resample_fallback_deinit(PcmResampler *state);
 
 const int16_t *
-pcm_resample_fallback_16(struct pcm_resample_state *state,
+pcm_resample_fallback_16(PcmResampler *state,
 			 unsigned channels,
 			 unsigned src_rate,
 			 const int16_t *src_buffer, size_t src_size,
@@ -86,7 +86,7 @@ pcm_resample_fallback_16(struct pcm_resample_state *state,
 			 size_t *dest_size_r);
 
 const int32_t *
-pcm_resample_fallback_32(struct pcm_resample_state *state,
+pcm_resample_fallback_32(PcmResampler *state,
 			 unsigned channels,
 			 unsigned src_rate,
 			 const int32_t *src_buffer,
diff --git a/src/pcm/pcm_resample_libsamplerate.c b/src/pcm/PcmResampleLibsamplerate.cxx
index f957e5155..532c79c8d 100644
--- a/src/pcm/pcm_resample_libsamplerate.c
+++ b/src/pcm/PcmResampleLibsamplerate.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2011 The Music Player Daemon Project
+ * 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
@@ -18,7 +18,7 @@
  */
 
 #include "config.h"
-#include "pcm_resample_internal.h"
+#include "PcmResampleInternal.hxx"
 #include "conf.h"
 
 #include <glib.h>
@@ -41,14 +41,14 @@ libsamplerate_quark(void)
 static bool
 lsr_parse_converter(const char *s)
 {
-	assert(s != NULL);
+	assert(s != nullptr);
 
 	if (*s == 0)
 		return true;
 
 	char *endptr;
 	long l = strtol(s, &endptr, 10);
-	if (*endptr == 0 && src_get_name(l) != NULL) {
+	if (*endptr == 0 && src_get_name(l) != nullptr) {
 		lsr_converter = l;
 		return true;
 	}
@@ -56,7 +56,7 @@ lsr_parse_converter(const char *s)
 	size_t length = strlen(s);
 	for (int i = 0;; ++i) {
 		const char *name = src_get_name(i);
-		if (name == NULL)
+		if (name == nullptr)
 			break;
 
 		if (g_ascii_strncasecmp(s, name, length) == 0) {
@@ -84,7 +84,7 @@ pcm_resample_lsr_global_init(const char *converter, GError **error_r)
 }
 
 void
-pcm_resample_lsr_init(struct pcm_resample_state *state)
+pcm_resample_lsr_init(PcmResampler *state)
 {
 	memset(state, 0, sizeof(*state));
 
@@ -94,9 +94,9 @@ pcm_resample_lsr_init(struct pcm_resample_state *state)
 }
 
 void
-pcm_resample_lsr_deinit(struct pcm_resample_state *state)
+pcm_resample_lsr_deinit(PcmResampler *state)
 {
-	if (state->state != NULL)
+	if (state->state != nullptr)
 		state->state = src_delete(state->state);
 
 	pcm_buffer_deinit(&state->in);
@@ -105,20 +105,17 @@ pcm_resample_lsr_deinit(struct pcm_resample_state *state)
 }
 
 void
-pcm_resample_lsr_reset(struct pcm_resample_state *state)
+pcm_resample_lsr_reset(PcmResampler *state)
 {
-	if (state->state != NULL)
+	if (state->state != nullptr)
 		src_reset(state->state);
 }
 
 static bool
-pcm_resample_set(struct pcm_resample_state *state,
+pcm_resample_set(PcmResampler *state,
 		 unsigned channels, unsigned src_rate, unsigned dest_rate,
 		 GError **error_r)
 {
-	int error;
-	SRC_DATA *data = &state->data;
-
 	/* (re)set the state/ratio if the in or out format changed */
 	if (channels == state->prev.channels &&
 	    src_rate == state->prev.src_rate &&
@@ -133,6 +130,7 @@ pcm_resample_set(struct pcm_resample_state *state,
 	if (state->state)
 		state->state = src_delete(state->state);
 
+	int error;
 	state->state = src_new(lsr_converter, channels, &error);
 	if (!state->state) {
 		g_set_error(error_r, libsamplerate_quark(), state->error,
@@ -141,6 +139,7 @@ pcm_resample_set(struct pcm_resample_state *state,
 		return false;
 	}
 
+	SRC_DATA *data = &state->data;
 	data->src_ratio = (double)dest_rate / (double)src_rate;
 	g_debug("setting samplerate conversion ratio to %.2lf",
 		data->src_ratio);
@@ -150,7 +149,7 @@ pcm_resample_set(struct pcm_resample_state *state,
 }
 
 static bool
-lsr_process(struct pcm_resample_state *state, GError **error_r)
+lsr_process(PcmResampler *state, GError **error_r)
 {
 	if (state->error == 0)
 		state->error = src_process(state->state, &state->data);
@@ -164,39 +163,31 @@ lsr_process(struct pcm_resample_state *state, GError **error_r)
 	return true;
 }
 
-static float *
-deconst_float_buffer(const float *in)
-{
-	union {
-		const float *in;
-		float *out;
-	} u = { .in = in };
-	return u.out;
-}
-
 const float *
-pcm_resample_lsr_float(struct pcm_resample_state *state,
+pcm_resample_lsr_float(PcmResampler *state,
 		       unsigned channels,
 		       unsigned src_rate,
 		       const float *src_buffer, size_t src_size,
 		       unsigned dest_rate, size_t *dest_size_r,
 		       GError **error_r)
 {
+	SRC_DATA *data = &state->data;
+
 	assert((src_size % (sizeof(*src_buffer) * channels)) == 0);
 
 	if (!pcm_resample_set(state, channels, src_rate, dest_rate, error_r))
-		return NULL;
+		return nullptr;
+
 
-	SRC_DATA *data = &state->data;
 	data->input_frames = src_size / sizeof(*src_buffer) / channels;
-	data->data_in = deconst_float_buffer(src_buffer);
+	data->data_in = const_cast<float *>(src_buffer);
 
 	data->output_frames = (src_size * dest_rate + src_rate - 1) / src_rate;
 	size_t data_out_size = data->output_frames * sizeof(float) * channels;
-	data->data_out = pcm_buffer_get(&state->out, data_out_size);
+	data->data_out = (float *)pcm_buffer_get(&state->out, data_out_size);
 
 	if (!lsr_process(state, error_r))
-		return NULL;
+		return nullptr;
 
 	*dest_size_r = data->output_frames_gen *
 		sizeof(*data->data_out) * channels;
@@ -204,43 +195,39 @@ pcm_resample_lsr_float(struct pcm_resample_state *state,
 }
 
 const int16_t *
-pcm_resample_lsr_16(struct pcm_resample_state *state,
+pcm_resample_lsr_16(PcmResampler *state,
 		    unsigned channels,
 		    unsigned src_rate,
 		    const int16_t *src_buffer, size_t src_size,
 		    unsigned dest_rate, size_t *dest_size_r,
 		    GError **error_r)
 {
-	bool success;
 	SRC_DATA *data = &state->data;
-	size_t data_in_size;
-	size_t data_out_size;
-	int16_t *dest_buffer;
 
 	assert((src_size % (sizeof(*src_buffer) * channels)) == 0);
 
-	success = pcm_resample_set(state, channels, src_rate, dest_rate,
-				   error_r);
-	if (!success)
-		return NULL;
+	if (!pcm_resample_set(state, channels, src_rate, dest_rate,
+			      error_r))
+		return nullptr;
 
 	data->input_frames = src_size / sizeof(*src_buffer) / channels;
-	data_in_size = data->input_frames * sizeof(float) * channels;
-	data->data_in = pcm_buffer_get(&state->in, data_in_size);
+	size_t data_in_size = data->input_frames * sizeof(float) * channels;
+	data->data_in = (float *)pcm_buffer_get(&state->in, data_in_size);
 
 	data->output_frames = (src_size * dest_rate + src_rate - 1) / src_rate;
-	data_out_size = data->output_frames * sizeof(float) * channels;
-	data->data_out = pcm_buffer_get(&state->out, data_out_size);
+	size_t data_out_size = data->output_frames * sizeof(float) * channels;
+	data->data_out = (float *)pcm_buffer_get(&state->out, data_out_size);
 
 	src_short_to_float_array(src_buffer, data->data_in,
 				 data->input_frames * channels);
 
 	if (!lsr_process(state, error_r))
-		return NULL;
+		return nullptr;
 
+	int16_t *dest_buffer;
 	*dest_size_r = data->output_frames_gen *
 		sizeof(*dest_buffer) * channels;
-	dest_buffer = pcm_buffer_get(&state->buffer, *dest_size_r);
+	dest_buffer = (int16_t *)pcm_buffer_get(&state->buffer, *dest_size_r);
 	src_float_to_short_array(data->data_out, dest_buffer,
 				 data->output_frames_gen * channels);
 
@@ -268,43 +255,39 @@ src_float_to_int_array (const float *in, int *out, int len)
 #endif
 
 const int32_t *
-pcm_resample_lsr_32(struct pcm_resample_state *state,
+pcm_resample_lsr_32(PcmResampler *state,
 		    unsigned channels,
 		    unsigned src_rate,
 		    const int32_t *src_buffer, size_t src_size,
 		    unsigned dest_rate, size_t *dest_size_r,
 		    GError **error_r)
 {
-	bool success;
 	SRC_DATA *data = &state->data;
-	size_t data_in_size;
-	size_t data_out_size;
-	int32_t *dest_buffer;
 
 	assert((src_size % (sizeof(*src_buffer) * channels)) == 0);
 
-	success = pcm_resample_set(state, channels, src_rate, dest_rate,
-				   error_r);
-	if (!success)
-		return NULL;
+	if (!pcm_resample_set(state, channels, src_rate, dest_rate,
+			      error_r))
+		return nullptr;
 
 	data->input_frames = src_size / sizeof(*src_buffer) / channels;
-	data_in_size = data->input_frames * sizeof(float) * channels;
-	data->data_in = pcm_buffer_get(&state->in, data_in_size);
+	size_t data_in_size = data->input_frames * sizeof(float) * channels;
+	data->data_in = (float *)pcm_buffer_get(&state->in, data_in_size);
 
 	data->output_frames = (src_size * dest_rate + src_rate - 1) / src_rate;
-	data_out_size = data->output_frames * sizeof(float) * channels;
-	data->data_out = pcm_buffer_get(&state->out, data_out_size);
+	size_t data_out_size = data->output_frames * sizeof(float) * channels;
+	data->data_out = (float *)pcm_buffer_get(&state->out, data_out_size);
 
 	src_int_to_float_array(src_buffer, data->data_in,
 			       data->input_frames * channels);
 
 	if (!lsr_process(state, error_r))
-		return NULL;
+		return nullptr;
 
+	int32_t *dest_buffer;
 	*dest_size_r = data->output_frames_gen *
 		sizeof(*dest_buffer) * channels;
-	dest_buffer = pcm_buffer_get(&state->buffer, *dest_size_r);
+	dest_buffer = (int32_t *)pcm_buffer_get(&state->buffer, *dest_size_r);
 	src_float_to_int_array(data->data_out, dest_buffer,
 			       data->output_frames_gen * channels);
 
diff --git a/src/pcm/pcm_resample.h b/src/pcm/pcm_resample.h
deleted file mode 100644
index a49a24142..000000000
--- a/src/pcm/pcm_resample.h
+++ /dev/null
@@ -1,164 +0,0 @@
-/*
- * Copyright (C) 2003-2011 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_RESAMPLE_H
-#define MPD_PCM_RESAMPLE_H
-
-#include "check.h"
-#include "pcm_buffer.h"
-
-#include <stdint.h>
-#include <stddef.h>
-#include <stdbool.h>
-
-#ifdef HAVE_LIBSAMPLERATE
-#include <samplerate.h>
-#endif
-
-/**
- * This object is statically allocated (within another struct), and
- * holds buffer allocations and the state for the resampler.
- */
-struct pcm_resample_state {
-#ifdef HAVE_LIBSAMPLERATE
-	SRC_STATE *state;
-	SRC_DATA data;
-
-	struct pcm_buffer in, out;
-
-	struct {
-		unsigned src_rate;
-		unsigned dest_rate;
-		unsigned channels;
-	} prev;
-
-	int error;
-#endif
-
-	struct pcm_buffer buffer;
-};
-
-bool
-pcm_resample_global_init(GError **error_r);
-
-/**
- * Initializes a pcm_resample_state object.
- */
-void pcm_resample_init(struct pcm_resample_state *state);
-
-/**
- * Deinitializes a pcm_resample_state object and frees allocated
- * memory.
- */
-void pcm_resample_deinit(struct pcm_resample_state *state);
-
-/**
- * @see pcm_convert_reset()
- */
-void
-pcm_resample_reset(struct pcm_resample_state *state);
-
-/**
- * Resamples 32 bit float data.
- *
- * @param state an initialized pcm_resample_state object
- * @param channels the number of channels
- * @param src_rate the source sample rate
- * @param src the source PCM buffer
- * @param src_size the size of #src in bytes
- * @param dest_rate the requested destination sample rate
- * @param dest_size_r returns the number of bytes of the destination buffer
- * @return the destination buffer
- */
-const float *
-pcm_resample_float(struct pcm_resample_state *state,
-		   unsigned channels,
-		   unsigned src_rate,
-		   const float *src_buffer, size_t src_size,
-		   unsigned dest_rate, size_t *dest_size_r,
-		   GError **error_r);
-
-/**
- * Resamples 16 bit PCM data.
- *
- * @param state an initialized pcm_resample_state object
- * @param channels the number of channels
- * @param src_rate the source sample rate
- * @param src the source PCM buffer
- * @param src_size the size of #src in bytes
- * @param dest_rate the requested destination sample rate
- * @param dest_size_r returns the number of bytes of the destination buffer
- * @return the destination buffer
- */
-const int16_t *
-pcm_resample_16(struct pcm_resample_state *state,
-		unsigned channels,
-		unsigned src_rate,
-		const int16_t *src_buffer, size_t src_size,
-		unsigned dest_rate, size_t *dest_size_r,
-		GError **error_r);
-
-/**
- * Resamples 32 bit PCM data.
- *
- * @param state an initialized pcm_resample_state object
- * @param channels the number of channels
- * @param src_rate the source sample rate
- * @param src the source PCM buffer
- * @param src_size the size of #src in bytes
- * @param dest_rate the requested destination sample rate
- * @param dest_size_r returns the number of bytes of the destination buffer
- * @return the destination buffer
- */
-const int32_t *
-pcm_resample_32(struct pcm_resample_state *state,
-		unsigned channels,
-		unsigned src_rate,
-		const int32_t *src_buffer, size_t src_size,
-		unsigned dest_rate, size_t *dest_size_r,
-		GError **error_r);
-
-/**
- * Resamples 24 bit PCM data.
- *
- * @param state an initialized pcm_resample_state object
- * @param channels the number of channels
- * @param src_rate the source sample rate
- * @param src the source PCM buffer
- * @param src_size the size of #src in bytes
- * @param dest_rate the requested destination sample rate
- * @param dest_size_r returns the number of bytes of the destination buffer
- * @return the destination buffer
- */
-static inline const int32_t *
-pcm_resample_24(struct pcm_resample_state *state,
-		unsigned channels,
-		unsigned src_rate,
-		const int32_t *src_buffer, size_t src_size,
-		unsigned dest_rate, size_t *dest_size_r,
-		GError **error_r)
-{
-	/* reuse the 32 bit code - the resampler code doesn't care if
-	   the upper 8 bits are actually used */
-	return pcm_resample_32(state, channels,
-			       src_rate, src_buffer, src_size,
-			       dest_rate, dest_size_r, error_r);
-}
-
-#endif