pcm_resample: convert to C++

1 files changed, 138 insertions, 0 deletions

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