1 files changed, 74 insertions, 0 deletions
diff --git a/src/snd_card_plugin.h b/src/snd_card_plugin.h
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+++ b/src/snd_card_plugin.h
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+/* snd_utils.h
+** Copyright (c) 2019, The Linux Foundation.
+**
+** Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above
+**     copyright notice, this list of conditions and the following
+**     disclaimer in the documentation and/or other materials provided
+**     with the distribution.
+**   * Neither the name of The Linux Foundation nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+** THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+** ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+** BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+** BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+** OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+** IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+**/
+
+#ifndef TINYALSA_SRC_SND_CARD_UTILS_H
+#define TINYALSA_SRC_SND_CARD_UTILS_H
+
+#include <tinyalsa/plugin.h>
+
+#include <dlfcn.h>
+
+/** Encapsulates the pcm device definition from
+ * the sound card definition configuration file.
+ */
+struct snd_node {
+    /** Pointer the card definition */
+    void *card_node;
+    /** Pointer to device definition, either PCM or MIXER device */
+    void *dev_node;
+    /** Pointer to the sound card parser library */
+    void *dl_hdl;
+    /** A pointer to the operations structure. */
+    const struct snd_node_ops* ops;
+};
+
+enum snd_node_type {
+    SND_NODE_TYPE_HW = 0,
+    SND_NODE_TYPE_PLUGIN,
+    SND_NODE_TYPE_INVALID,
+};
+
+enum {
+  NODE_PCM,
+  NODE_MIXER
+};
+
+struct snd_node *snd_utils_open_pcm(unsigned int card, unsigned int device);
+
+struct snd_node *snd_utils_open_mixer(unsigned int card);
+
+void snd_utils_close_dev_node(struct snd_node *node);
+
+enum snd_node_type snd_utils_get_node_type(struct snd_node *node);
+
+int snd_utils_get_int(struct snd_node *node, const char *prop, int *val);
+
+int snd_utils_get_str(struct snd_node *node, const char *prop, char **val);
+
+#endif /* end of TINYALSA_SRC_SND_CARD_UTILS_H */