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Add new framework for the PCM decoder. It is now a 'front end' for lower-level drivers like the WM8904 that performs the PCM decoding from end

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Gregory Nutt
2014-07-22 11:54:13 -06:00
parent 8548c64915
commit a4dcd690bb
9 changed files with 720 additions and 85 deletions
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audio/Makefile
+1 -1
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@@ -50,7 +50,7 @@ VPATH = .
# the appropriate paths to the VPATH variable
ifeq ($(CONFIG_AUDIO_FORMAT_PCM),y)
CSRCS += pcm.c
CSRCS += pcm_decode.c
endif
AOBJS = $(ASRCS:.S=$(OBJEXT))
audio/README.txt
+6 -6
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@@ -17,12 +17,12 @@ This directory holds the NuttX audio subsystem upper-half. The upper-half provi
a common interface for applications to interface with and also defines a bind
layer for specific lower-half audio device drivers.
audio.c - The upper-half driver that binds to a lower-half driver from the
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!
audio.c - The upper-half driver that binds to a lower-half driver from the
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_decode.c - Routines to decode PCM / WAV type data.
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
audio/pcm.c
-94
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@@ -1,94 +0,0 @@
/****************************************************************************
* audio/pcm.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/audio.h>
#if defined(CONFIG_AUDIO) && defined(CONFIG_AUDIO_FORMAT_PCM)
/****************************************************************************
* Preprocessor Definitions
****************************************************************************/
/* Configuration ************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Variables
****************************************************************************/
/****************************************************************************
* Public Variables
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: audio_pcm_init
*
* Initialized the Audio PCM library.
*
****************************************************************************/
int audio_pcm_initialize(void)
{
/* Initialze the Audio PCM routines */
return OK;
}
#endif /* CONFIG_AUDIO && CONFIG_AUDIO_FORMAT_PCM */
audio/pcm_decode.c
+564
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