1 files changed, 164 insertions, 0 deletions
diff --git a/src/pcm/pcm_resample.h b/src/pcm/pcm_resample.h
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+/*
+ * 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