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apache / nuttx / a18aebc2c6d3cee8dfc33e08b2d3d05836fc9afc / . / audio / audio_comp.c
blob: d9957da3131c45e0a67d8415ce4a391130ee2442 [file] [log] [blame]
/****************************************************************************
* audio/audio_comp.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <stdarg.h>
#include <nuttx/audio/audio.h>
#include <nuttx/audio/audio_comp.h>
#include <nuttx/kmalloc.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/* This structure describes the internal state of the audio composite */
struct audio_comp_priv_s
{
/* This is is our appearance to the outside world. This *MUST* be the
* first element of the structure so that we can freely cast between
* types struct audio_lowerhalf and struct audio_comp_dev_s.
*/
struct audio_lowerhalf_s export;
/* This is the contained, low-level audio device array and count. */
FAR struct audio_lowerhalf_s **lower;
int count;
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int audio_comp_getcaps(FAR struct audio_lowerhalf_s *dev, int type,
FAR struct audio_caps_s *caps);
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int audio_comp_configure(FAR struct audio_lowerhalf_s *dev,
FAR void *session,
FAR const struct audio_caps_s *caps);
#else
static int audio_comp_configure(FAR struct audio_lowerhalf_s *dev,
FAR const struct audio_caps_s *caps);
#endif
static int audio_comp_shutdown(FAR struct audio_lowerhalf_s *dev);
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int audio_comp_start(FAR struct audio_lowerhalf_s *dev,
FAR void *session);
#else
static int audio_comp_start(FAR struct audio_lowerhalf_s *dev);
#endif
#ifndef CONFIG_AUDIO_EXCLUDE_STOP
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int audio_comp_stop(FAR struct audio_lowerhalf_s *dev,
FAR void *session);
#else
static int audio_comp_stop(FAR struct audio_lowerhalf_s *dev);
#endif
#endif
#ifndef CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int audio_comp_pause(FAR struct audio_lowerhalf_s *dev,
FAR void *session);
static int audio_comp_resume(FAR struct audio_lowerhalf_s *dev,
FAR void *session);
#else
static int audio_comp_pause(FAR struct audio_lowerhalf_s *dev);
static int audio_comp_resume(FAR struct audio_lowerhalf_s *dev);
#endif
#endif
static int audio_comp_allocbuffer(FAR struct audio_lowerhalf_s *dev,
FAR struct audio_buf_desc_s *bufdesc);
static int audio_comp_freebuffer(FAR struct audio_lowerhalf_s *dev,
FAR struct audio_buf_desc_s *bufdesc);
static int audio_comp_enqueuebuffer(FAR struct audio_lowerhalf_s *dev,
FAR struct ap_buffer_s *apb);
static int audio_comp_cancelbuffer(FAR struct audio_lowerhalf_s *dev,
FAR struct ap_buffer_s *apb);
static int audio_comp_ioctl(FAR struct audio_lowerhalf_s *dev, int cmd,
unsigned long arg);
static int audio_comp_read(FAR struct audio_lowerhalf_s *dev,
FAR char *buffer, size_t buflen);
static int audio_comp_write(FAR struct audio_lowerhalf_s *dev,
FAR const char *buffer, size_t buflen);
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int audio_comp_reserve(FAR struct audio_lowerhalf_s *dev,
FAR void **session);
#else
static int audio_comp_reserve(FAR struct audio_lowerhalf_s *dev);
#endif
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int audio_comp_release(FAR struct audio_lowerhalf_s *dev,
FAR void *session);
#else
static int audio_comp_release(FAR struct audio_lowerhalf_s *dev);
#endif
#ifdef CONFIG_AUDIO_MULTI_SESSION
static void audio_comp_callback(FAR void *arg, uint16_t reason,
FAR struct ap_buffer_s *apb,
uint16_t status,
FAR void *session);
#else
static void audio_comp_callback(FAR void *arg, uint16_t reason,
FAR struct ap_buffer_s *apb,
uint16_t status);
#endif
/****************************************************************************
* Private Data
****************************************************************************/
static const struct audio_ops_s g_audio_comp_ops =
{
audio_comp_getcaps, /* getcaps */
audio_comp_configure, /* configure */
audio_comp_shutdown, /* shutdown */
audio_comp_start, /* start */
#ifndef CONFIG_AUDIO_EXCLUDE_STOP
audio_comp_stop, /* stop */
#endif
#ifndef CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME
audio_comp_pause, /* pause */
audio_comp_resume, /* resume */
#endif
audio_comp_allocbuffer, /* allocbuffer */
audio_comp_freebuffer, /* freebuffer */
audio_comp_enqueuebuffer, /* enqueue_buffer */
audio_comp_cancelbuffer, /* cancel_buffer */
audio_comp_ioctl, /* ioctl */
audio_comp_read, /* read */
audio_comp_write, /* write */
audio_comp_reserve, /* reserve */
audio_comp_release /* release */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: audio_comp_getcaps
*
* Description: Get the audio device capabilities
*
****************************************************************************/
static int audio_comp_getcaps(FAR struct audio_lowerhalf_s *dev, int type,
FAR struct audio_caps_s *caps)
{
FAR struct audio_comp_priv_s *priv = (FAR struct audio_comp_priv_s *)dev;
FAR struct audio_lowerhalf_s **lower = priv->lower;
int ret = -ENOTTY;
int max = UINT8_MAX;
int min = 0;
int i;
caps->ac_channels = UINT8_MAX;
caps->ac_format.hw = UINT16_MAX;
caps->ac_controls.w = UINT32_MAX;
for (i = 0; i < priv->count; i++)
{
if (lower[i]->ops->getcaps)
{
FAR struct audio_caps_s dup = *caps;
int tmp = lower[i]->ops->getcaps(lower[i], type, &dup);
if (tmp == -ENOTTY)
{
continue;
}
ret = tmp;
if (ret < 0)
{
break;
}
if (max > (dup.ac_channels & 0x0f))
{
max = dup.ac_channels & 0x0f;
}
if (min < (dup.ac_channels & 0xf0))
{
min = dup.ac_channels & 0xf0;
}
caps->ac_format.hw &= dup.ac_format.hw;
caps->ac_controls.w &= dup.ac_controls.w;
}
}
caps->ac_channels = max | min;
return ret;
}
/****************************************************************************
* Name: audio_comp_configure
*
* Description:
* Configure the audio device for the specified mode of operation.
*
****************************************************************************/
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int audio_comp_configure(FAR struct audio_lowerhalf_s *dev,
FAR void *session,
FAR const struct audio_caps_s *caps)
#else
static int audio_comp_configure(FAR struct audio_lowerhalf_s *dev,
FAR const struct audio_caps_s *caps)
#endif
{
FAR struct audio_comp_priv_s *priv = (FAR struct audio_comp_priv_s *)dev;
FAR struct audio_lowerhalf_s **lower = priv->lower;
#ifdef CONFIG_AUDIO_MULTI_SESSION
FAR void **sess = session;
#endif
int ret = -ENOTTY;
int i;
for (i = 0; i < priv->count; i++)
{
if (lower[i]->ops->configure)
{
#ifdef CONFIG_AUDIO_MULTI_SESSION
int tmp = lower[i]->ops->configure(lower[i], sess[i], caps);
#else
int tmp = lower[i]->ops->configure(lower[i], caps);
#endif
if (tmp == -ENOTTY)
{
continue;
}
ret = tmp;
if (ret < 0)
{
break;
}
}
}
return ret;
}
/****************************************************************************
* Name: audio_comp_shutdown
*
* Description:
* Shutdown the driver and put it in the lowest power state possible.
*
****************************************************************************/
static int audio_comp_shutdown(FAR struct audio_lowerhalf_s *dev)
{
FAR struct audio_comp_priv_s *priv = (FAR struct audio_comp_priv_s *)dev;
FAR struct audio_lowerhalf_s **lower = priv->lower;
int ret = -ENOTTY;
int i;
for (i = priv->count - 1; i >= 0; i--)
{
if (lower[i]->ops->shutdown)
{
int tmp = lower[i]->ops->shutdown(lower[i]);
if (tmp == -ENOTTY)
{
continue;
}
if (tmp < 0 || ret == -ENOTTY || ret >= 0)
{
ret = tmp;
}
}
}
return ret;
}
/****************************************************************************
* Name: audio_comp_start
*
* Description:
* Start the configured operation (audio streaming, volume enabled, etc.).
*
****************************************************************************/
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int audio_comp_start(FAR struct audio_lowerhalf_s *dev,
FAR void *session)
#else
static int audio_comp_start(FAR struct audio_lowerhalf_s *dev)
#endif
{
FAR struct audio_comp_priv_s *priv = (FAR struct audio_comp_priv_s *)dev;
FAR struct audio_lowerhalf_s **lower = priv->lower;
#ifdef CONFIG_AUDIO_MULTI_SESSION
FAR void **sess = session;
#endif
int ret = -ENOTTY;
int i;
for (i = 0; i < priv->count; i++)
{
if (lower[i]->ops->start)
{
#ifdef CONFIG_AUDIO_MULTI_SESSION
int tmp = lower[i]->ops->start(lower[i], sess[i]);
#else
int tmp = lower[i]->ops->start(lower[i]);
#endif
if (tmp == -ENOTTY)
{
continue;
}
ret = tmp;
if (ret >= 0)
{
continue;
}
while (--i >= 0)
{
if (lower[i]->ops->stop)
{
#ifdef CONFIG_AUDIO_MULTI_SESSION
lower[i]->ops->stop(lower[i], sess[i]);
#else
lower[i]->ops->stop(lower[i]);
#endif
}
}
break;
}
}
return ret;
}
/****************************************************************************
* Name: audio_comp_stop
*
* Description: Stop the configured operation (audio streaming, volume
* disabled, etc.).
*
****************************************************************************/
#ifndef CONFIG_AUDIO_EXCLUDE_STOP
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int audio_comp_stop(FAR struct audio_lowerhalf_s *dev,
FAR void *session)
#else
static int audio_comp_stop(FAR struct audio_lowerhalf_s *dev)
#endif
{
FAR struct audio_comp_priv_s *priv = (FAR struct audio_comp_priv_s *)dev;
FAR struct audio_lowerhalf_s **lower = priv->lower;
#ifdef CONFIG_AUDIO_MULTI_SESSION
FAR void **sess = session;
#endif
int ret = -ENOTTY;
int i;
for (i = priv->count - 1; i >= 0; i--)
{
if (lower[i]->ops->stop)
{
#ifdef CONFIG_AUDIO_MULTI_SESSION
int tmp = lower[i]->ops->stop(lower[i], sess[i]);
#else
int tmp = lower[i]->ops->stop(lower[i]);
#endif
if (tmp == -ENOTTY)
{
continue;
}
if (tmp < 0 || ret == -ENOTTY || ret >= 0)
{
ret = tmp;
}
}
}
return ret;
}
#endif
/****************************************************************************
* Name: audio_comp_pause
*
* Description: Pauses the playback.
*
****************************************************************************/
#ifndef CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int audio_comp_pause(FAR struct audio_lowerhalf_s *dev,
FAR void *session)
#else
static int audio_comp_pause(FAR struct audio_lowerhalf_s *dev)
#endif
{
FAR struct audio_comp_priv_s *priv = (FAR struct audio_comp_priv_s *)dev;
FAR struct audio_lowerhalf_s **lower = priv->lower;
#ifdef CONFIG_AUDIO_MULTI_SESSION
FAR void **sess = session;
#endif
int ret = -ENOTTY;
int i;
for (i = priv->count - 1; i >= 0; i--)
{
if (lower[i]->ops->pause)
{
#ifdef CONFIG_AUDIO_MULTI_SESSION
int tmp = lower[i]->ops->pause(lower[i], sess[i]);
#else
int tmp = lower[i]->ops->pause(lower[i]);
#endif
if (tmp == -ENOTTY)
{
continue;
}
if (tmp < 0 || ret == -ENOTTY || ret >= 0)
{
ret = tmp;
}
}
}
return ret;
}
#endif /* CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME */
/****************************************************************************
* Name: audio_comp_resume
*
* Description: Resumes the playback.
*
****************************************************************************/
#ifndef CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int audio_comp_resume(FAR struct audio_lowerhalf_s *dev,
FAR void *session)
#else
static int audio_comp_resume(FAR struct audio_lowerhalf_s *dev)
#endif
{
FAR struct audio_comp_priv_s *priv = (FAR struct audio_comp_priv_s *)dev;
FAR struct audio_lowerhalf_s **lower = priv->lower;
#ifdef CONFIG_AUDIO_MULTI_SESSION
FAR void **sess = session;
#endif
int ret = -ENOTTY;
int i;
for (i = 0; i < priv->count; i++)
{
if (lower[i]->ops->resume)
{
#ifdef CONFIG_AUDIO_MULTI_SESSION
int tmp = lower[i]->ops->resume(lower[i], sess[i]);
#else
int tmp = lower[i]->ops->resume(lower[i]);
#endif
if (tmp == -ENOTTY)
{
continue;
}
ret = tmp;
if (ret >= 0)
{
continue;
}
while (--i >= 0)
{
if (lower[i]->ops->pause)
{
#ifdef CONFIG_AUDIO_MULTI_SESSION
lower[i]->ops->pause(lower[i], sess[i]);
#else
lower[i]->ops->pause(lower[i]);
#endif
}
}
break;
}
}
return ret;
}
#endif /* CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME */
/****************************************************************************
* Name: audio_comp_allocbuffer
*
* Description: Allocate an audio pipeline buffer.
*
****************************************************************************/
static int audio_comp_allocbuffer(FAR struct audio_lowerhalf_s *dev,
FAR struct audio_buf_desc_s *bufdesc)
{
FAR struct audio_comp_priv_s *priv = (FAR struct audio_comp_priv_s *)dev;
FAR struct audio_lowerhalf_s **lower = priv->lower;
int ret = -ENOTTY;
int i;
for (i = 0; i < priv->count; i++)
{
if (lower[i]->ops->allocbuffer)
{
ret = lower[i]->ops->allocbuffer(lower[i], bufdesc);
if (ret != -ENOTTY)
{
break;
}
}
}
if (ret == -ENOTTY)
{
ret = apb_alloc(bufdesc);
}
return ret;
}
/****************************************************************************
* Name: audio_comp_freebuffer
*
* Description: Free an audio pipeline buffer.
*
****************************************************************************/
static int audio_comp_freebuffer(FAR struct audio_lowerhalf_s *dev,
FAR struct audio_buf_desc_s *bufdesc)
{
FAR struct audio_comp_priv_s *priv = (FAR struct audio_comp_priv_s *)dev;
FAR struct audio_lowerhalf_s **lower = priv->lower;
int ret = -ENOTTY;
int i;
for (i = 0; i < priv->count; i++)
{
if (lower[i]->ops->freebuffer)
{
ret = lower[i]->ops->freebuffer(lower[i], bufdesc);
if (ret != -ENOTTY)
{
break;
}
}
}
if (ret == -ENOTTY)
{
apb_free(bufdesc->u.buffer);
ret = sizeof(*bufdesc);
}
return ret;
}
/****************************************************************************
* Name: audio_comp_enqueuebuffer
*
* Description: Enqueue an Audio Pipeline Buffer for playback/ processing.
*
****************************************************************************/
static int audio_comp_enqueuebuffer(FAR struct audio_lowerhalf_s *dev,
FAR struct ap_buffer_s *apb)
{
FAR struct audio_comp_priv_s *priv = (FAR struct audio_comp_priv_s *)dev;
FAR struct audio_lowerhalf_s **lower = priv->lower;
int ret = -ENOTTY;
int i;
for (i = 0; i < priv->count; i++)
{
if (lower[i]->ops->enqueuebuffer)
{
ret = lower[i]->ops->enqueuebuffer(lower[i], apb);
if (ret != -ENOTTY)
{
break;
}
}
}
return ret;
}
/****************************************************************************
* Name: audio_comp_cancelbuffer
*
* Description: Called when an enqueued buffer is being cancelled.
*
****************************************************************************/
static int audio_comp_cancelbuffer(FAR struct audio_lowerhalf_s *dev,
FAR struct ap_buffer_s *apb)
{
FAR struct audio_comp_priv_s *priv = (FAR struct audio_comp_priv_s *)dev;
FAR struct audio_lowerhalf_s **lower = priv->lower;
int ret = -ENOTTY;
int i;
for (i = 0; i < priv->count; i++)
{
if (lower[i]->ops->cancelbuffer)
{
ret = lower[i]->ops->cancelbuffer(lower[i], apb);
if (ret != -ENOTTY)
{
break;
}
}
}
return ret;
}
/****************************************************************************
* Name: audio_comp_ioctl
*
* Description: Perform a device ioctl
*
****************************************************************************/
static int audio_comp_ioctl(FAR struct audio_lowerhalf_s *dev, int cmd,
unsigned long arg)
{
FAR struct audio_comp_priv_s *priv = (FAR struct audio_comp_priv_s *)dev;
FAR struct audio_lowerhalf_s **lower = priv->lower;
int ret = -ENOTTY;
int i;
for (i = 0; i < priv->count; i++)
{
if (lower[i]->ops->ioctl)
{
int tmp = lower[i]->ops->ioctl(lower[i], cmd, arg);
if (tmp == -ENOTTY)
{
continue;
}
ret = tmp;
if (ret < 0)
{
break;
}
}
}
return ret;
}
/****************************************************************************
* Name: audio_comp_read
*
* Description: Lower-half logic for read commands.
*
****************************************************************************/
static int audio_comp_read(FAR struct audio_lowerhalf_s *dev,
FAR char *buffer, size_t buflen)
{
FAR struct audio_comp_priv_s *priv = (FAR struct audio_comp_priv_s *)dev;
FAR struct audio_lowerhalf_s **lower = priv->lower;
int ret = -ENOTTY;
int i;
for (i = 0; i < priv->count; i++)
{
if (lower[i]->ops->read)
{
ret = lower[i]->ops->read(lower[i], buffer, buflen);
if (ret != -ENOTTY)
{
break;
}
}
}
return ret;
}
/****************************************************************************
* Name: audio_comp_write
*
* Description: Lower-half logic for write commands.
*
****************************************************************************/
static int audio_comp_write(FAR struct audio_lowerhalf_s *dev,
FAR const char *buffer, size_t buflen)
{
FAR struct audio_comp_priv_s *priv = (FAR struct audio_comp_priv_s *)dev;
FAR struct audio_lowerhalf_s **lower = priv->lower;
int ret = -ENOTTY;
int i;
for (i = 0; i < priv->count; i++)
{
if (lower[i]->ops->write)
{
ret = lower[i]->ops->write(lower[i], buffer, buflen);
if (ret != -ENOTTY)
{
break;
}
}
}
return ret;
}
/****************************************************************************
* Name: audio_comp_reserve
*
* Description: Reserves a session.
*
****************************************************************************/
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int audio_comp_reserve(FAR struct audio_lowerhalf_s *dev,
FAR void **session)
#else
static int audio_comp_reserve(FAR struct audio_lowerhalf_s *dev)
#endif
{
FAR struct audio_comp_priv_s *priv = (FAR struct audio_comp_priv_s *)dev;
FAR struct audio_lowerhalf_s **lower = priv->lower;
#ifdef CONFIG_AUDIO_MULTI_SESSION
FAR void **sess;
#endif
int ret = OK;
int i;
#ifdef CONFIG_AUDIO_MULTI_SESSION
sess = kmm_calloc(priv->count, sizeof(*sess));
if (sess == NULL)
{
return -ENOMEM;
}
#endif
for (i = 0; i < priv->count; i++)
{
if (lower[i]->ops->reserve)
{
#ifdef CONFIG_AUDIO_MULTI_SESSION
int tmp = lower[i]->ops->reserve(lower[i], &sess[i]);
#else
int tmp = lower[i]->ops->reserve(lower[i]);
#endif
if (tmp == -ENOTTY)
{
continue;
}
ret = tmp;
if (ret >= 0)
{
continue;
}
while (--i >= 0)
{
if (lower[i]->ops->release)
{
#ifdef CONFIG_AUDIO_MULTI_SESSION
lower[i]->ops->release(lower[i], sess[i]);
#else
lower[i]->ops->release(lower[i]);
#endif
}
}
#ifdef CONFIG_AUDIO_MULTI_SESSION
kmm_free(sess);
sess = NULL;
#endif
break;
}
}
#ifdef CONFIG_AUDIO_MULTI_SESSION
*session = sess;
#endif
return ret;
}
/****************************************************************************
* Name: audio_comp_release
*
* Description: Releases the session.
*
****************************************************************************/
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int audio_comp_release(FAR struct audio_lowerhalf_s *dev,
FAR void *session)
#else
static int audio_comp_release(FAR struct audio_lowerhalf_s *dev)
#endif
{
FAR struct audio_comp_priv_s *priv = (FAR struct audio_comp_priv_s *)dev;
FAR struct audio_lowerhalf_s **lower = priv->lower;
#ifdef CONFIG_AUDIO_MULTI_SESSION
FAR void **sess = session;
#endif
int ret = OK;
int i;
for (i = priv->count - 1; i >= 0; i--)
{
if (lower[i]->ops->release)
{
#ifdef CONFIG_AUDIO_MULTI_SESSION
int tmp = lower[i]->ops->release(lower[i], sess[i]);
#else
int tmp = lower[i]->ops->release(lower[i]);
#endif
if (tmp == -ENOTTY)
{
continue;
}
if (tmp < 0 || ret >= 0)
{
ret = tmp;
}
}
}
#ifdef CONFIG_AUDIO_MULTI_SESSION
kmm_free(sess);
#endif
return ret;
}
/****************************************************************************
* Name: audio_comp_callback
*
* Description:
* Lower-to-upper level callback for buffer dequeueing.
*
* Input Parameters:
* arg - The value of the 'priv' field from audio_lowerhalf_s.
*
* Returned Value:
* None
*
****************************************************************************/
#ifdef CONFIG_AUDIO_MULTI_SESSION
static void audio_comp_callback(FAR void *arg, uint16_t reason,
FAR struct ap_buffer_s *apb, uint16_t status,
FAR void *session)
#else
static void audio_comp_callback(FAR void *arg, uint16_t reason,
FAR struct ap_buffer_s *apb, uint16_t status)
#endif
{
FAR struct audio_comp_priv_s *priv = arg;
#ifdef CONFIG_AUDIO_MULTI_SESSION
priv->export.upper(priv->export.priv, reason, apb, status, session);
#else
priv->export.upper(priv->export.priv, reason, apb, status);
#endif
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: audio_comp_initialize
*
* Description:
* Initialize the composite audio device.
*
* Input Parameters:
* name - The name of the audio device.
* ... - The list of the lower half audio driver.
*
* Returned Value:
* struct audio_lowerhalf_s* on success; NULL on failure.
*
* Note
* The variable argument list must be NULL terminated.
*
****************************************************************************/
FAR struct audio_lowerhalf_s *audio_comp_initialize(FAR const char *name,
...)
{
FAR struct audio_comp_priv_s *priv;
va_list ap;
int ret = -ENOMEM;
int i;
priv = kmm_zalloc(sizeof(struct audio_comp_priv_s));
if (priv == NULL)
{
return NULL;
}
priv->export.ops = &g_audio_comp_ops;
va_start(ap, name);
while (va_arg(ap, FAR struct audio_lowerhalf_s *))
{
priv->count++;
}
va_end(ap);
priv->lower = kmm_calloc(priv->count,
sizeof(FAR struct audio_lowerhalf_s *));
if (priv->lower == NULL)
{
goto free_priv;
}
va_start(ap, name);
for (i = 0; i < priv->count; i++)
{
FAR struct audio_lowerhalf_s *tmp;
tmp = va_arg(ap, FAR struct audio_lowerhalf_s *);
tmp->upper = audio_comp_callback;
tmp->priv = priv;
priv->lower[i] = tmp;
}
va_end(ap);
if (name != NULL)
{
ret = audio_register(name, &priv->export);
if (ret < 0)
{
goto free_lower;
}
}
return &priv->export;
free_lower:
kmm_free(priv->lower);
free_priv:
kmm_free(priv);
return NULL;
}