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nuttx/drivers/audio/audio_null.c

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/****************************************************************************
* drivers/audio/audio_null.c
*
* A do-nothinig audio device driver to simplify testing of audio decoders.
*
* Copyright (C) 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 <sys/ioctl.h>
#include <stdint.h>
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <queue.h>
#include <debug.h>
#include <nuttx/kmalloc.h>
#include <nuttx/fs/fs.h>
#include <nuttx/fs/ioctl.h>
#include <nuttx/audio/audio.h>
#include <nuttx/audio/audio_null.h>
/****************************************************************************
* Private Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
struct null_dev_s
{
struct audio_lowerhalf_s dev; /* Audio lower half (this device) */
mqd_t mq; /* Message queue for receiving messages */
char mqname[16]; /* Our message queue name */
pthread_t threadid; /* ID of our thread */
#ifndef CONFIG_AUDIO_EXCLUDE_STOP
volatile bool terminate; /* True: request to terminate */
#endif
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int null_getcaps(FAR struct audio_lowerhalf_s *dev, int type,
FAR struct audio_caps_s *caps);
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int null_configure(FAR struct audio_lowerhalf_s *dev,
FAR void *session, FAR const struct audio_caps_s *caps);
#else
static int null_configure(FAR struct audio_lowerhalf_s *dev,
FAR const struct audio_caps_s *caps);
#endif
static int null_shutdown(FAR struct audio_lowerhalf_s *dev);
static void *null_workerthread(pthread_addr_t pvarg);
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int null_start(FAR struct audio_lowerhalf_s *dev,
FAR void *session);
#else
static int null_start(FAR struct audio_lowerhalf_s *dev);
#endif
#ifndef CONFIG_AUDIO_EXCLUDE_STOP
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int null_stop(FAR struct audio_lowerhalf_s *dev,
FAR void* session);
#else
static int null_stop(FAR struct audio_lowerhalf_s *dev);
#endif
#endif
#ifndef CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int null_pause(FAR struct audio_lowerhalf_s *dev,
FAR void* session);
static int null_resume(FAR struct audio_lowerhalf_s *dev,
FAR void* session);
#else
static int null_pause(FAR struct audio_lowerhalf_s *dev);
static int null_resume(FAR struct audio_lowerhalf_s *dev);
#endif
#endif
static int null_enqueuebuffer(FAR struct audio_lowerhalf_s *dev,
FAR struct ap_buffer_s *apb);
static int null_cancelbuffer(FAR struct audio_lowerhalf_s *dev,
FAR struct ap_buffer_s *apb);
static int null_ioctl(FAR struct audio_lowerhalf_s *dev, int cmd,
unsigned long arg);
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int null_reserve(FAR struct audio_lowerhalf_s *dev,
FAR void **session);
#else
static int null_reserve(FAR struct audio_lowerhalf_s *dev);
#endif
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int null_release(FAR struct audio_lowerhalf_s *dev,
FAR void *session);
#else
static int null_release(FAR struct audio_lowerhalf_s *dev);
#endif
/****************************************************************************
* Private Data
****************************************************************************/
static const struct audio_ops_s g_audioops =
{
null_getcaps, /* getcaps */
null_configure, /* configure */
null_shutdown, /* shutdown */
null_start, /* start */
#ifndef CONFIG_AUDIO_EXCLUDE_STOP
null_stop, /* stop */
#endif
#ifndef CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME
null_pause, /* pause */
null_resume, /* resume */
#endif
NULL, /* allocbuffer */
NULL, /* freebuffer */
null_enqueuebuffer, /* enqueue_buffer */
null_cancelbuffer, /* cancel_buffer */
null_ioctl, /* ioctl */
NULL, /* read */
NULL, /* write */
null_reserve, /* reserve */
null_release /* release */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: null_getcaps
*
* Description: Get the audio device capabilities
*
****************************************************************************/
static int null_getcaps(FAR struct audio_lowerhalf_s *dev, int type,
FAR struct audio_caps_s *caps)
{
audvdbg("type=%d\n", type);
/* Validate the structure */
DEBUGASSERT(caps->ac_len >= sizeof(struct audio_caps_s));
/* Fill in the caller's structure based on requested info */
caps->ac_format.hw = 0;
caps->ac_controls.w = 0;
switch (caps->ac_type)
{
/* Caller is querying for the types of units we support */
case AUDIO_TYPE_QUERY:
/* Provide our overall capabilities. The interfacing software
* must then call us back for specific info for each capability.
*/
caps->ac_channels = 2; /* Stereo output */
switch (caps->ac_subtype)
{
case AUDIO_TYPE_QUERY:
/* We don't decode any formats! Only something above us in
* the audio stream can perform decoding on our behalf.
*/
/* The types of audio units we implement */
caps->ac_controls.b[0] = AUDIO_TYPE_OUTPUT | AUDIO_TYPE_FEATURE |
AUDIO_TYPE_PROCESSING;
break;
case AUDIO_FMT_MIDI:
/* We only support Format 0 */
caps->ac_controls.b[0] = AUDIO_SUBFMT_END;
break;
default:
caps->ac_controls.b[0] = AUDIO_SUBFMT_END;
break;
}
break;
/* Provide capabilities of our OUTPUT unit */
case AUDIO_TYPE_OUTPUT:
caps->ac_channels = 2;
switch (caps->ac_subtype)
{
case AUDIO_TYPE_QUERY:
/* Report the Sample rates we support */
caps->ac_controls.b[0] = AUDIO_SAMP_RATE_8K | AUDIO_SAMP_RATE_11K |
AUDIO_SAMP_RATE_16K | AUDIO_SAMP_RATE_22K |
AUDIO_SAMP_RATE_32K | AUDIO_SAMP_RATE_44K |
AUDIO_SAMP_RATE_48K;
break;
case AUDIO_FMT_MP3:
case AUDIO_FMT_WMA:
case AUDIO_FMT_PCM:
break;
default:
break;
}
break;
/* Provide capabilities of our FEATURE units */
case AUDIO_TYPE_FEATURE:
/* If the sub-type is UNDEF, then report the Feature Units we support */
if (caps->ac_subtype == AUDIO_FU_UNDEF)
{
/* Fill in the ac_controls section with the Feature Units we have */
caps->ac_controls.b[0] = AUDIO_FU_VOLUME | AUDIO_FU_BASS | AUDIO_FU_TREBLE;
caps->ac_controls.b[1] = AUDIO_FU_BALANCE >> 8;
}
else
{
/* TODO: Do we need to provide specific info for the Feature Units,
* such as volume setting ranges, etc.?
*/
}
break;
/* Provide capabilities of our PROCESSING unit */
case AUDIO_TYPE_PROCESSING:
switch (caps->ac_subtype)
{
case AUDIO_PU_UNDEF:
/* Provide the type of Processing Units we support */
caps->ac_controls.b[0] = AUDIO_PU_STEREO_EXTENDER;
break;
case AUDIO_PU_STEREO_EXTENDER:
/* Provide capabilities of our Stereo Extender */
caps->ac_controls.b[0] = AUDIO_STEXT_ENABLE | AUDIO_STEXT_WIDTH;
break;
default:
/* Other types of processing uint we don't support */
break;
}
break;
/* All others we don't support */
default:
/* Zero out the fields to indicate no support */
caps->ac_subtype = 0;
caps->ac_channels = 0;
break;
}
/* Return the length of the audio_caps_s struct for validation of
* proper Audio device type.
*/
audvdbg("Return %d\n", caps->ac_len);
return caps->ac_len;
}
/****************************************************************************
* Name: null_configure
*
* Description:
* Configure the audio device for the specified mode of operation.
*
****************************************************************************/
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int null_configure(FAR struct audio_lowerhalf_s *dev,
FAR void *session,
FAR const struct audio_caps_s *caps)
#else
static int null_configure(FAR struct audio_lowerhalf_s *dev,
FAR const struct audio_caps_s *caps)
#endif
{
audvdbg("ac_type: %d\n", caps->ac_type);
/* Process the configure operation */
switch (caps->ac_type)
{
case AUDIO_TYPE_FEATURE:
audvdbg(" AUDIO_TYPE_FEATURE\n");
/* Process based on Feature Unit */
switch (caps->ac_format.hw)
{
#ifndef CONFIG_AUDIO_EXCLUDE_VOLUME
case AUDIO_FU_VOLUME:
audvdbg(" Volume: %d\n", caps->ac_controls.hw[0]);
break;
#endif /* CONFIG_AUDIO_EXCLUDE_VOLUME */
#ifndef CONFIG_AUDIO_EXCLUDE_TONE
case AUDIO_FU_BASS:
audvdbg(" Bass: %d\n", caps->ac_controls.b[0]);
break;
case AUDIO_FU_TREBLE:
audvdbg(" Treble: %d\n", caps->ac_controls.b[0]);
break;
#endif /* CONFIG_AUDIO_EXCLUDE_TONE */
default:
auddbg(" Unrecognized feature unit\n");
break;
}
break;
case AUDIO_TYPE_OUTPUT:
audvdbg(" AUDIO_TYPE_OUTPUT:\n");
audvdbg(" Number of channels: %u\n", caps->ac_channels);
audvdbg(" Sample rate: %u\n", caps->ac_controls.hw[0]);
audvdbg(" Sample width: %u\n", caps->ac_controls.b[2]);
break;
case AUDIO_TYPE_PROCESSING:
audvdbg(" AUDIO_TYPE_PROCESSING:\n");
break;
}
audvdbg("Return OK\n");
return OK;
}
/****************************************************************************
* Name: null_shutdown
*
* Description:
* Shutdown the driver and put it in the lowest power state possible.
*
****************************************************************************/
static int null_shutdown(FAR struct audio_lowerhalf_s *dev)
{
audvdbg("Return OK\n");
return OK;
}
/****************************************************************************
* Name: null_workerthread
*
* This is the thread that feeds data to the chip and keeps the audio
* stream going.
*
****************************************************************************/
static void *null_workerthread(pthread_addr_t pvarg)
{
FAR struct null_dev_s *priv = (struct null_dev_s *) pvarg;
struct audio_msg_s msg;
int msglen;
int prio;
audvdbg("Entry\n");
/* Loop as long as we are supposed to be running */
#ifndef CONFIG_AUDIO_EXCLUDE_STOP
while (!priv->terminate)
#else
for (;;)
#endif
{
/* Wait for messages from our message queue */
msglen = mq_receive(priv->mq, &msg, sizeof(msg), &prio);
/* Handle the case when we return with no message */
if (msglen < sizeof(struct audio_msg_s))
{
auddbg("ERROR: Message too small: %d\n", msglen);
continue;
}
/* Process the message */
switch (msg.msgId)
{
case AUDIO_MSG_DATA_REQUEST:
break;
#ifndef CONFIG_AUDIO_EXCLUDE_STOP
case AUDIO_MSG_STOP:
priv->terminate = true;
break;
#endif
case AUDIO_MSG_ENQUEUE:
break;
case AUDIO_MSG_COMPLETE:
break;
default:
auddbg("ERROR: Ignoring message ID %d\n", msg.msgId);
break;
}
}
/* Close the message queue */
mq_close(priv->mq);
mq_unlink(priv->mqname);
priv->mq = NULL;
/* Send an AUDIO_MSG_COMPLETE message to the client */
#ifdef CONFIG_AUDIO_MULTI_SESSION
priv->dev.upper(priv->dev.priv, AUDIO_CALLBACK_COMPLETE, NULL, OK, NULL);
#else
priv->dev.upper(priv->dev.priv, AUDIO_CALLBACK_COMPLETE, NULL, OK);
#endif
audvdbg("Exit\n");
return NULL;
}
/****************************************************************************
* Name: null_start
*
* Description:
* Start the configured operation (audio streaming, volume enabled, etc.).
*
****************************************************************************/
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int null_start(FAR struct audio_lowerhalf_s *dev, FAR void *session)
#else
static int null_start(FAR struct audio_lowerhalf_s *dev)
#endif
{
FAR struct null_dev_s *priv = (FAR struct null_dev_s *)dev;
struct sched_param sparam;
struct mq_attr attr;
pthread_attr_t tattr;
FAR void *value;
int ret;
audvdbg("Entry\n");
/* Create a message queue for the worker thread */
snprintf(priv->mqname, sizeof(priv->mqname), "/tmp/%X", priv);
attr.mq_maxmsg = 16;
attr.mq_msgsize = sizeof(struct audio_msg_s);
attr.mq_curmsgs = 0;
attr.mq_flags = 0;
priv->mq = mq_open(priv->mqname, O_RDWR | O_CREAT, 0644, &attr);
if (priv->mq == NULL)
{
/* Error creating message queue! */
auddbg("ERROR: Couldn't allocate message queue\n");
return -ENOMEM;
}
/* Join any old worker thread we had created to prevent a memory leak */
if (priv->threadid != 0)
{
audvdbg("Joining old thread\n");
pthread_join(priv->threadid, &value);
}
/* Start our thread for sending data to the device */
pthread_attr_init(&tattr);
sparam.sched_priority = sched_get_priority_max(SCHED_FIFO) - 3;
(void)pthread_attr_setschedparam(&tattr, &sparam);
(void)pthread_attr_setstacksize(&tattr, CONFIG_AUDIO_NULL_WORKER_STACKSIZE);
audvdbg("Starting worker thread\n");
ret = pthread_create(&priv->threadid, &tattr, null_workerthread,
(pthread_addr_t)priv);
if (ret != OK)
{
auddbg("ERROR: pthread_create failed: %d\n", ret);
}
else
{
pthread_setname_np(priv->threadid, "null audio");
audvdbg("Created worker thread\n");
}
audvdbg("Return %d\n", ret);
return ret;
}
/****************************************************************************
* Name: null_stop
*
* Description: Stop the configured operation (audio streaming, volume
* disabled, etc.).
*
****************************************************************************/
#ifndef CONFIG_AUDIO_EXCLUDE_STOP
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int null_stop(FAR struct audio_lowerhalf_s *dev, FAR void* session)
#else
static int null_stop(FAR struct audio_lowerhalf_s *dev)
#endif
{
FAR struct null_dev_s *priv = (FAR struct null_dev_s *)dev;
struct audio_msg_s term_msg;
FAR void *value;
/* Send a message to stop all audio streaming */
/* REVISIT: There should be a check to see if the worker thread is still
* running.
*/
term_msg.msgId = AUDIO_MSG_STOP;
term_msg.u.data = 0;
mq_send(priv->mq, &term_msg, sizeof(term_msg), CONFIG_AUDIO_NULL_MSG_PRIO);
/* Join the worker thread */
pthread_join(priv->threadid, &value);
priv->threadid = 0;
audvdbg("Return OK\n");
return OK;
}
#endif
/****************************************************************************
* Name: null_pause
*
* Description: Pauses the playback.
*
****************************************************************************/
#ifndef CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int null_pause(FAR struct audio_lowerhalf_s *dev, FAR void* session)
#else
static int null_pause(FAR struct audio_lowerhalf_s *dev)
#endif
{
audvdbg("Return OK\n");
return OK;
}
#endif /* CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME */
/****************************************************************************
* Name: null_resume
*
* Description: Resumes the playback.
*
****************************************************************************/
#ifndef CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int null_resume(FAR struct audio_lowerhalf_s *dev, FAR void* session)
#else
static int null_resume(FAR struct audio_lowerhalf_s *dev)
#endif
{
audvdbg("Return OK\n");
return OK;
}
#endif /* CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME */
/****************************************************************************
* Name: null_enqueuebuffer
*
* Description: Enqueue an Audio Pipeline Buffer for playback/ processing.
*
****************************************************************************/
static int null_enqueuebuffer(FAR struct audio_lowerhalf_s *dev,
FAR struct ap_buffer_s *apb)
{
FAR struct null_dev_s *priv = (FAR struct null_dev_s *)dev;
bool final;
audvdbg("apb=%p curbyte=%d nbytes=%d\n", apb, apb->curbyte, apb->nbytes);
/* Say that we consumed all of the data */
apb->curbyte = apb->nbytes;
/* Check if this was the last buffer in the stream */
done = ((apb->flags & AUDIO_APB_FINAL) != 0);
/* And return the buffer to the upper level */
DEBUGASSERT(priv && apb && priv->dev.upper);
/* The buffer belongs to to an upper level. Just forward the event to
* the next level up.
*/
#ifdef CONFIG_AUDIO_MULTI_SESSION
priv->dev.upper(priv->dev.priv, AUDIO_CALLBACK_DEQUEUE, apb, OK, NULL);
#else
priv->dev.upper(priv->dev.priv, AUDIO_CALLBACK_DEQUEUE, apb, OK);
#endif
/* Say we are done playing if this was the last buffer in the stream */
if (done)
{
#ifdef CONFIG_AUDIO_MULTI_SESSION
priv->dev.upper(priv->dev.priv, AUDIO_CALLBACK_COMPLETE, NULL, OK, NULL);
#else
priv->dev.upper(priv->dev.priv, AUDIO_CALLBACK_COMPLETE, NULL, OK);
#endif
}
audvdbg("Return OK\n");
return OK;
}
/****************************************************************************
* Name: null_cancelbuffer
*
* Description: Called when an enqueued buffer is being cancelled.
*
****************************************************************************/
static int null_cancelbuffer(FAR struct audio_lowerhalf_s *dev,
FAR struct ap_buffer_s *apb)
{
audvdbg("apb=%p curbyte=%d nbytes=%d, return OK\n",
apb, apb->curbyte, apb->nbytes);
return OK;
}
/****************************************************************************
* Name: null_ioctl
*
* Description: Perform a device ioctl
*
****************************************************************************/
static int null_ioctl(FAR struct audio_lowerhalf_s *dev, int cmd,
unsigned long arg)
{
#ifdef CONFIG_AUDIO_DRIVER_SPECIFIC_BUFFERS
FAR struct ap_buffer_info_s *bufinfo;
#endif
audvdbg("cmd=%d arg=%ld\n");
/* Deal with ioctls passed from the upper-half driver */
switch (cmd)
{
/* Check for AUDIOIOC_HWRESET ioctl. This ioctl is passed straight
* through from the upper-half audio driver.
*/
case AUDIOIOC_HWRESET:
{
audvdbg("AUDIOIOC_HWRESET:\n");
}
break;
/* Report our preferred buffer size and quantity */
#ifdef CONFIG_AUDIO_DRIVER_SPECIFIC_BUFFERS
case AUDIOIOC_GETBUFFERINFO:
{
audvdbg("AUDIOIOC_GETBUFFERINFO:\n");
bufinfo = (FAR struct ap_buffer_info_s *) arg;
bufinfo->buffer_size = CONFIG_AUDIO_NULL_BUFFER_SIZE;
bufinfo->nbuffers = CONFIG_AUDIO_NULL_NUM_BUFFERS;
}
break;
#endif
default:
break;
}
audvdbg("Return OK\n");
return OK;
}
/****************************************************************************
* Name: null_reserve
*
* Description: Reserves a session (the only one we have).
*
****************************************************************************/
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int null_reserve(FAR struct audio_lowerhalf_s *dev,
FAR void **session)
#else
static int null_reserve(FAR struct audio_lowerhalf_s *dev)
#endif
{
audvdbg("Return OK\n");
return OK;
}
/****************************************************************************
* Name: null_release
*
* Description: Releases the session (the only one we have).
*
****************************************************************************/
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int null_release(FAR struct audio_lowerhalf_s *dev,
FAR void *session)
#else
static int null_release(FAR struct audio_lowerhalf_s *dev)
#endif
{
FAR struct null_dev_s *priv = (FAR struct null_dev_s *)dev;
void *value;
/* Join any old worker thread we had created to prevent a memory leak */
if (priv->threadid != 0)
{
pthread_join(priv->threadid, &value);
priv->threadid = 0;
}
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: audio_null_initialize
*
* Description:
* Initialize the null audio device.
*
* Input Parameters:
* i2c - An I2C driver instance
* i2s - An I2S driver instance
* lower - Persistent board configuration data
*
* Returned Value:
* A new lower half audio interface for the NULL audio device is returned
* on success; NULL is returned on failure.
*
****************************************************************************/
FAR struct audio_lowerhalf_s *audio_null_initialize(void)
{
FAR struct null_dev_s *priv;
/* Allocate the null audio device structure */
priv = (FAR struct null_dev_s *)kzalloc(sizeof(struct null_dev_s));
if (priv)
{
/* Initialize the null audio device structure. Since we used kzalloc,
* only the non-zero elements of the structure need to be initialized.
*/
priv->dev.ops = &g_audioops;
return &priv->dev;
}
auddbg("ERROR: Failed to allocate null audio device\n");
return NULL;
}
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