--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/CSP2/CSP2_env/env-d9b9114564458d9d-741b3de822f2aaca6c6caa4325c4afce/include/alsa/pcm_rate.h	Tue Mar 18 17:55:14 2025 -0400
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+/**
+ * \file include/pcm_rate.h
+ * \brief External Rate-Converter-Plugin SDK
+ * \author Takashi Iwai <tiwai@suse.de>
+ * \date 2006
+ *
+ * External Rate-Converter-Plugin SDK
+ */
+
+/*
+ * ALSA external PCM rate-converter plugin SDK (draft version)
+ *
+ * Copyright (c) 2006 Takashi Iwai <tiwai@suse.de>
+ *
+ *   This library is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU Lesser General Public License as
+ *   published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
+ *
+ *   You should have received a copy of the GNU Lesser General Public
+ *   License along with this library; if not, write to the Free Software
+ *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#ifndef __ALSA_PCM_RATE_H
+#define __ALSA_PCM_RATE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Protocol version
+ */
+#define SND_PCM_RATE_PLUGIN_VERSION	0x010002
+
+/** hw_params information for a single side */
+typedef struct snd_pcm_rate_side_info {
+	snd_pcm_format_t format;
+	unsigned int rate;
+	snd_pcm_uframes_t buffer_size;
+	snd_pcm_uframes_t period_size;
+} snd_pcm_rate_side_info_t;
+
+/** hw_params information */
+typedef struct snd_pcm_rate_info {
+	struct snd_pcm_rate_side_info in;
+	struct snd_pcm_rate_side_info out;
+	unsigned int channels;
+} snd_pcm_rate_info_t;
+
+/** Callback table of rate-converter */
+typedef struct snd_pcm_rate_ops {
+	/**
+	 * close the converter; optional
+	 */
+	void (*close)(void *obj);
+	/**
+	 * initialize the converter, called at hw_params
+	 */
+	int (*init)(void *obj, snd_pcm_rate_info_t *info);
+	/**
+	 * free the converter; optional
+	 */
+	void (*free)(void *obj);
+	/**
+	 * reset the converter, called at prepare; optional
+	 */
+	void (*reset)(void *obj);
+	/**
+	 * adjust the pitch, called at sw_params; optional
+	 */
+	int (*adjust_pitch)(void *obj, snd_pcm_rate_info_t *info);
+	/**
+	 * convert the data
+	 */
+	void (*convert)(void *obj,
+			const snd_pcm_channel_area_t *dst_areas,
+			snd_pcm_uframes_t dst_offset, unsigned int dst_frames,
+			const snd_pcm_channel_area_t *src_areas,
+			snd_pcm_uframes_t src_offset, unsigned int src_frames);
+	/**
+	 * convert an s16 interleaved-data array; exclusive with convert
+	 */
+	void (*convert_s16)(void *obj, int16_t *dst, unsigned int dst_frames,
+			    const int16_t *src, unsigned int src_frames);
+	/**
+	 * compute the frame size for input
+	 */
+	snd_pcm_uframes_t (*input_frames)(void *obj, snd_pcm_uframes_t frames);
+	/**
+	 * compute the frame size for output
+	 */
+	snd_pcm_uframes_t (*output_frames)(void *obj, snd_pcm_uframes_t frames);
+	/**
+	 * the protocol version the plugin supports;
+	 * new field since version 0x010002
+	 */
+	unsigned int version;
+	/**
+	 * return the supported min / max sample rates;
+	 * new ops since version 0x010002
+	 */
+	int (*get_supported_rates)(void *obj, unsigned int *rate_min,
+				   unsigned int *rate_max);
+	/**
+	 * show some status messages for verbose mode;
+	 * new ops since version 0x010002
+	 */
+	void (*dump)(void *obj, snd_output_t *out);
+} snd_pcm_rate_ops_t;
+
+/** open function type */
+typedef int (*snd_pcm_rate_open_func_t)(unsigned int version, void **objp,
+					snd_pcm_rate_ops_t *opsp);
+
+typedef int (*snd_pcm_rate_open_conf_func_t)(unsigned int version, void **objp,
+					snd_pcm_rate_ops_t *opsp, const snd_config_t *conf);
+
+/**
+ * Define the object entry for external PCM rate-converter plugins
+ */
+#define SND_PCM_RATE_PLUGIN_ENTRY(name) _snd_pcm_rate_##name##_open
+#define SND_PCM_RATE_PLUGIN_CONF_ENTRY(name) _snd_pcm_rate_##name##_open_conf
+
+#ifndef DOC_HIDDEN
+/* old rate_ops for protocol version 0x010001 */
+typedef struct snd_pcm_rate_old_ops {
+	void (*close)(void *obj);
+	int (*init)(void *obj, snd_pcm_rate_info_t *info);
+	void (*free)(void *obj);
+	void (*reset)(void *obj);
+	int (*adjust_pitch)(void *obj, snd_pcm_rate_info_t *info);
+	void (*convert)(void *obj,
+			const snd_pcm_channel_area_t *dst_areas,
+			snd_pcm_uframes_t dst_offset, unsigned int dst_frames,
+			const snd_pcm_channel_area_t *src_areas,
+			snd_pcm_uframes_t src_offset, unsigned int src_frames);
+	void (*convert_s16)(void *obj, int16_t *dst, unsigned int dst_frames,
+			    const int16_t *src, unsigned int src_frames);
+	snd_pcm_uframes_t (*input_frames)(void *obj, snd_pcm_uframes_t frames);
+	snd_pcm_uframes_t (*output_frames)(void *obj, snd_pcm_uframes_t frames);
+} snd_pcm_rate_old_ops_t;
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __ALSA_PCM_RATE_H */