1 files changed, 165 insertions, 0 deletions
diff --git a/nuttx/audio/buffer.c b/nuttx/audio/buffer.c
new file mode 100644
index 000000000..d6c6ac930
--- /dev/null
+++ b/nuttx/audio/buffer.c
@@ -0,0 +1,165 @@
+/****************************************************************************
+ * audio/buffer.c
+ *
+ *   Copyright (C) 2013 Ken Pettit. All rights reserved.
+ *   Author: Ken Pettit <pettitkd@gmail.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. Neither the name NuttX 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 BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <semaphore.h>
+#include <errno.h>
+#include <debug.h>
+
+#include <nuttx/kmalloc.h>
+#include <nuttx/audio.h>
+#include <nuttx/usb/audio.h>
+
+#if defined(CONFIG_AUDIO)
+
+/****************************************************************************
+ * Preprocessor Definitions
+ ****************************************************************************/
+
+/* Configuration ************************************************************/
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: apb_semtake
+ *
+ *       Take an Audio Pipeline Buffer.
+ *
+ ****************************************************************************/
+
+static void apb_semtake(sem_t *sem)
+{
+  /* Take the semaphore (perhaps waiting) */
+
+  while (sem_wait(sem) != 0)
+    {
+      /* The only case that an error should occr here is if
+       * the wait was awakened by a signal.
+       */
+
+      ASSERT(errno == EINTR);
+    }
+}
+
+/****************************************************************************
+ * Name: apb_semgive
+ ****************************************************************************/
+
+#define apb_semgive(s) sem_post(s)
+
+/****************************************************************************
+ * Name: apb_alloc
+ *
+ * Allocate an Audio Pipeline Buffer for use in the Audio sub-system.  This
+ * will perform the actual allocate based on buffer data format, number of
+ * channels, etc. and prepare the buffer for consumption.
+ *
+ ****************************************************************************/
+
+FAR struct ap_buffer_s *apb_alloc(int type, int sampleCount)
+{
+  /* TODO:  Implement the alloc logic */
+
+  return NULL;
+}
+
+/****************************************************************************
+ * Name: apb_prepare
+ *
+ * Prepare an AP Buffer for use in the Audio Pipeline.
+ *
+ ****************************************************************************/
+
+void apb_prepare(FAR struct ap_buffer_s *apb, int8_t allocmode, uint8_t format,
+    uint8_t subformat, apb_samp_t maxsamples)
+{
+  /* Perform a reference count decrement and possibly release the memory */
+
+}
+
+/****************************************************************************
+ * Name: apb_free
+ *
+ * Free's a previously allocated or referenced Audio Pipeline Buffer
+ *
+ ****************************************************************************/
+
+void apb_free(FAR struct ap_buffer_s *apb)
+{
+  /* Perform a reference count decrement and possibly release the memory */
+
+}
+
+/****************************************************************************
+ * Name: apb_reference
+ *
+ * Claim a reference to an Audio Pipeline Buffer.  Each call to apb_reference
+ * will increment the reference count and must have a matching apb_free
+ * call.  When the refcount decrements to zero, the buffer will be freed.
+ *
+ ****************************************************************************/
+
+void apb_reference(FAR struct ap_buffer_s *apb)
+{
+  /* TODO:  Implement the reference logic */
+}
+
+#endif /* CONFIG_AUDIO */
+