Moved audio/buffer.c to libc/audio/lib_buffer.c so that it can be shared betweent he OS and applications in a kernel build

ChangeLog

@@ -6020,3 +6020,8 @@
 	* drivers/audio/vs1053:  VS1053 worker thread stack size is now
 	  configurable and assigned a name via pthread_setname_np(). From Ken
 	  Pettit (2013-11-10).
+	* libc/audio/lib_buffer.c:  Moved audio/buffer/c to libc/audio/lib_buffer.c.
+	  This file was moved because it contains buffer management functions
+	  that must be available to audio applications.  If it was left in the
+	  audio/ directory then it would not be available to applications in the
+	  NuttX Kernel build (2013-11-10).

audio/Makefile

@@ -42,7 +42,7 @@ endif
 
 DEPPATH = --dep-path .
 ASRCS =
-CSRCS = audio.c buffer.c
+CSRCS = audio.c
 VPATH = .
 
 # Include support for various drivers.  Each Make.defs file will add its

audio/README.txt

@@ -21,13 +21,18 @@ layer for specific lower-half audio device drivers.
               drivers/audio subdirectory.  For each attached audio device, there
               will be an instance of this upper-half driver bound to the
               instance of the lower half driver context.
+  pcm.c     - Routines to manage PCM / WAV type data.  Currently just a placeholder.
+  README    - This file!
+
+Portions of the the audio system interface have application interfaces.  Those
+portions reside in the nuttx/libc/audio directory where the will be built for
+access by both OS driver logic and user application logic.  Those relevant
+files in nuttx/libc/audio include:
+
   buffer.c  - Routines to manage creattion and destruction of audio pipeline buffers
               (apb) used in the audio subsystem.  Audio pipeline buffers are passed
               between user applications and the audio drivers to deliver audio
               content for playback (or possibly recording in the future).
-  pcm.c     - Routines to manage PCM / WAV type data.  Currently just a placeholder.
-  README    - This file!
-
 
 Related Header Files
 ^^^^^^^^^^^^^^^^^^^^

libc/Makefile

@@ -73,6 +73,7 @@ include spawn/Make.defs
 include queue/Make.defs
 include wqueue/Make.defs
 include misc/Make.defs
+include audio/Make.defs
 
 BINDIR ?= bin
 

libc/README.txt

@@ -25,6 +25,7 @@ The files in the libc/ directory are organized (mostly) according which file
 in the include/ directory provides the prototype for library functions.  So
 we have:
 
+  audio     - This part of the audio system: nuttx/audio/audio.h
   libgen    - libgen.h
   fixedmath - fixedmath.h
   math      - math.h
@@ -44,7 +45,7 @@ There is also a misc/ subdirectory that contains various internal functions
 and interfaces from header files that are too few to warrant their own sub-
 directory:
 
- misc       - Nonstandard "glue" logic, debug.h, crc32.h, dirent.h
+  misc      - Nonstandard "glue" logic, debug.h, crc32.h, dirent.h
 
 Library Database
 ================

libc/audio/lib_buffer.c

@@ -1,5 +1,5 @@
 /****************************************************************************
- * audio/buffer.c
+ * libc/audio/lib_buffer.c
  *
  *   Copyright (C) 2013 Ken Pettit. All rights reserved.
  *   Author: Ken Pettit <pettitkd@gmail.com>
@@ -161,7 +161,6 @@ 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 */
-
 }
 
 /****************************************************************************
@@ -207,4 +206,3 @@ void apb_reference(FAR struct ap_buffer_s *apb)
 }
 
 #endif /* CONFIG_AUDIO */
-