--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/CSP2/CSP2_env/env-d9b9114564458d9d-741b3de822f2aaca6c6caa4325c4afce/include/alsa/pcm_extplug.h	Tue Mar 18 17:55:14 2025 -0400
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+/**
+ * \file include/pcm_extplug.h
+ * \brief External Filter-Plugin SDK
+ * \author Takashi Iwai <tiwai@suse.de>
+ * \date 2005
+ *
+ * External Filter-Plugin SDK
+ */
+
+/*
+ * ALSA external PCM plugin SDK (draft version)
+ *
+ * Copyright (c) 2005 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_EXTPLUG_H
+#define __ALSA_PCM_EXTPLUG_H
+
+/**
+ * \defgroup PCM_ExtPlug External Filter plugin SDK
+ * \ingroup Plugin_SDK
+ * See the \ref pcm page for more details.
+ * \{
+ */
+
+/** hw constraints for extplug */
+enum {
+	SND_PCM_EXTPLUG_HW_FORMAT,	/**< format */
+	SND_PCM_EXTPLUG_HW_CHANNELS,	/**< channels */
+	SND_PCM_EXTPLUG_HW_PARAMS	/**< max number of hw constraints */
+};
+	
+/** Handle of external filter plugin */
+typedef struct snd_pcm_extplug snd_pcm_extplug_t;
+/** Callback table of extplug */
+typedef struct snd_pcm_extplug_callback snd_pcm_extplug_callback_t;
+#ifdef DOC_HIDDEN
+/* redefine typedefs for stupid doxygen */
+typedef snd_pcm_extplug snd_pcm_extplug_t;
+typedef snd_pcm_extplug_callback snd_pcm_extplug_callback_t;
+#endif
+
+/*
+ * Protocol version
+ */
+#define SND_PCM_EXTPLUG_VERSION_MAJOR	1	/**< Protocol major version */
+#define SND_PCM_EXTPLUG_VERSION_MINOR	0	/**< Protocol minor version */
+#define SND_PCM_EXTPLUG_VERSION_TINY	2	/**< Protocol tiny version */
+/**
+ * Filter-plugin protocol version
+ */
+#define SND_PCM_EXTPLUG_VERSION		((SND_PCM_EXTPLUG_VERSION_MAJOR<<16) |\
+					 (SND_PCM_EXTPLUG_VERSION_MINOR<<8) |\
+					 (SND_PCM_EXTPLUG_VERSION_TINY))
+
+/** Handle of extplug */
+struct snd_pcm_extplug {
+	/**
+	 * protocol version; #SND_PCM_EXTPLUG_VERSION must be filled here
+	 * before calling #snd_pcm_extplug_create()
+	 */
+	unsigned int version;
+	/**
+	 * name of this plugin; must be filled before calling #snd_pcm_extplug_create()
+	 */
+	const char *name;
+	/**
+	 * callbacks of this plugin; must be filled before calling #snd_pcm_extplug_create()
+	 */
+	const snd_pcm_extplug_callback_t *callback;
+	/**
+	 * private data, which can be used freely in the driver callbacks
+	 */
+	void *private_data;
+	/**
+	 * PCM handle filled by #snd_pcm_extplug_create()
+	 */
+	snd_pcm_t *pcm;
+	/**
+	 * stream direction; read-only status
+	 */
+	snd_pcm_stream_t stream;
+	/**
+	 * format hw parameter; filled after hw_params is caled
+	 */
+	snd_pcm_format_t format;
+	/**
+	 * subformat hw parameter; filled after hw_params is caled
+	 */
+	snd_pcm_subformat_t subformat;
+	/**
+	 * channels hw parameter; filled after hw_params is caled
+	 */
+	unsigned int channels;
+	/**
+	 * rate hw parameter; filled after hw_params is caled
+	 */
+	unsigned int rate;
+	/**
+	 * slave_format hw parameter; filled after hw_params is caled
+	 */
+	snd_pcm_format_t slave_format;
+	/**
+	 * slave_subformat hw parameter; filled after hw_params is caled
+	 */
+	snd_pcm_subformat_t slave_subformat;
+	/**
+	 * slave_channels hw parameter; filled after hw_params is caled
+	 */
+	unsigned int slave_channels;
+};
+
+/** Callback table of extplug */
+struct snd_pcm_extplug_callback {
+	/**
+	 * transfer between source and destination; this is a required callback
+	 */
+	snd_pcm_sframes_t (*transfer)(snd_pcm_extplug_t *ext,
+				      const snd_pcm_channel_area_t *dst_areas,
+				      snd_pcm_uframes_t dst_offset,
+				      const snd_pcm_channel_area_t *src_areas,
+				      snd_pcm_uframes_t src_offset,
+				      snd_pcm_uframes_t size);
+	/**
+	 * close the PCM; optional
+	 */
+	int (*close)(snd_pcm_extplug_t *ext);
+	/**
+	 * hw_params; optional
+	 */
+	int (*hw_params)(snd_pcm_extplug_t *ext, snd_pcm_hw_params_t *params);
+	/**
+	 * hw_free; optional
+	 */
+	int (*hw_free)(snd_pcm_extplug_t *ext);
+	/**
+	 * dump; optional
+	 */
+	void (*dump)(snd_pcm_extplug_t *ext, snd_output_t *out);
+	/**
+	 * init; optional initialization called at prepare or reset
+	 */
+	int (*init)(snd_pcm_extplug_t *ext);
+	/**
+	 * query the channel maps; optional; since v1.0.2
+	 */
+	snd_pcm_chmap_query_t **(*query_chmaps)(snd_pcm_extplug_t *ext);
+	/**
+	 * get the channel map; optional; since v1.0.2
+	 */
+	snd_pcm_chmap_t *(*get_chmap)(snd_pcm_extplug_t *ext);
+	/**
+	 * set the channel map; optional; since v1.0.2
+	 */
+	int (*set_chmap)(snd_pcm_extplug_t *ext, const snd_pcm_chmap_t *map);
+};
+
+
+int snd_pcm_extplug_create(snd_pcm_extplug_t *ext, const char *name,
+			   snd_config_t *root, snd_config_t *slave_conf,
+			   snd_pcm_stream_t stream, int mode);
+int snd_pcm_extplug_delete(snd_pcm_extplug_t *ext);
+
+/* clear hw_parameter setting */
+void snd_pcm_extplug_params_reset(snd_pcm_extplug_t *ext);
+
+/* hw_parameter setting */
+int snd_pcm_extplug_set_param_list(snd_pcm_extplug_t *extplug, int type, unsigned int num_list, const unsigned int *list);
+int snd_pcm_extplug_set_param_minmax(snd_pcm_extplug_t *extplug, int type, unsigned int min, unsigned int max);
+int snd_pcm_extplug_set_slave_param_list(snd_pcm_extplug_t *extplug, int type, unsigned int num_list, const unsigned int *list);
+int snd_pcm_extplug_set_slave_param_minmax(snd_pcm_extplug_t *extplug, int type, unsigned int min, unsigned int max);
+int snd_pcm_extplug_set_param_link(snd_pcm_extplug_t *extplug, int type,
+				   int keep_link);
+
+/**
+ * set the parameter constraint with a single value
+ */
+static __inline__ int snd_pcm_extplug_set_param(snd_pcm_extplug_t *extplug, int type, unsigned int val)
+{
+	return snd_pcm_extplug_set_param_list(extplug, type, 1, &val);
+}
+
+/**
+ * set the parameter constraint for slave PCM with a single value
+ */
+static __inline__ int snd_pcm_extplug_set_slave_param(snd_pcm_extplug_t *extplug, int type, unsigned int val)
+{
+	return snd_pcm_extplug_set_slave_param_list(extplug, type, 1, &val);
+}
+
+/** \} */
+
+#endif /* __ALSA_PCM_EXTPLUG_H */