添加rtthread相关代码

riscv/rtthread/components/drivers/audio/audio_pipe.h

@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2006-2023, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ */
+#ifndef __AUDIO_PIPE_H__
+#define __AUDIO_PIPE_H__
+
+/**
+ * Pipe Device
+ */
+#include <rtdevice.h>
+
+#ifndef RT_PIPE_BUFSZ
+#define PIPE_BUFSZ    512
+#else
+#define PIPE_BUFSZ    RT_PIPE_BUFSZ
+#endif
+
+/* portal device */
+struct rt_audio_portal_device
+{
+    struct rt_device parent;
+    struct rt_device *write_dev;
+    struct rt_device *read_dev;
+};
+
+enum rt_audio_pipe_flag
+{
+    /* both read and write won't block */
+    RT_PIPE_FLAG_NONBLOCK_RDWR = 0x00,
+    /* read would block */
+    RT_PIPE_FLAG_BLOCK_RD = 0x01,
+    /* write would block */
+    RT_PIPE_FLAG_BLOCK_WR = 0x02,
+    /* write to this pipe will discard some data when the pipe is full.
+     * When this flag is set, RT_PIPE_FLAG_BLOCK_WR will be ignored since write
+     * operation will always be success. */
+    RT_PIPE_FLAG_FORCE_WR = 0x04,
+};
+
+struct rt_audio_pipe
+{
+    struct rt_device parent;
+
+    /* ring buffer in pipe device */
+    struct rt_ringbuffer ringbuffer;
+
+    rt_int32_t flag;
+
+    /* suspended list */
+    rt_list_t suspended_read_list;
+    rt_list_t suspended_write_list;
+
+    struct rt_audio_portal_device *write_portal;
+    struct rt_audio_portal_device *read_portal;
+};
+
+#define PIPE_CTRL_GET_SPACE          0x14            /**< get the remaining size of a pipe device */
+
+rt_err_t rt_audio_pipe_init(struct rt_audio_pipe *pipe,
+                      const char *name,
+                      rt_int32_t flag,
+                      rt_uint8_t *buf,
+                      rt_size_t size);
+rt_err_t rt_audio_pipe_detach(struct rt_audio_pipe *pipe);
+#ifdef RT_USING_HEAP
+rt_err_t rt_audio_pipe_create(const char *name, rt_int32_t flag, rt_size_t size);
+void rt_audio_pipe_destroy(struct rt_audio_pipe *pipe);
+#endif /* RT_USING_HEAP */
+
+#endif /* __AUDIO_PIPE_H__ */