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837b405624
nuttx-apps/system/nxrecorder/nxrecorder.c
Xiang Xiao 837b405624 Change all files come from Xiaomi/Pinecone to Apache License 2.0 
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
2020-08-23 15:44:32 -06:00

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/****************************************************************************
* apps/system/nxrecorder/nxrecorder.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 <nuttx/config.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
#include <dirent.h>
#include <debug.h>
#include <nuttx/audio/audio.h>
#include "system/nxrecorder.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define NXRECORDER_STATE_IDLE 0
#define NXRECORDER_STATE_RECORDING 1
#define NXRECORDER_STATE_PAUSED 2
#ifndef CONFIG_NXRECORDER_MSG_PRIO
# define CONFIG_NXRECORDER_MSG_PRIO 1
#endif
#ifndef CONFIG_NXRECORDER_RECORDTHREAD_STACKSIZE
# define CONFIG_NXRECORDER_RECORDTHREAD_STACKSIZE 1500
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: nxrecorder_opendevice
*
* nxrecorder_opendevice() either searches the Audio system for a device
* that is compatible with the specified audio format and opens it, or
* tries to open the device if specified and validates that it supports
* the requested format.
*
* Return:
* OK if compatible device opened
* -ENODEV if no compatible device opened.
* -ENOENT if device couldn't be opened.
*
****************************************************************************/
static int nxrecorder_opendevice(FAR struct nxrecorder_s *precorder)
{
/* If we have a device, then open it */
if (precorder->device[0] != '\0')
{
/* Use the saved prefformat to test if the requested
* format is specified by the device
*/
/* Device supports the format. Open the device file. */
precorder->dev_fd = open(precorder->device, O_RDWR);
if (precorder->dev_fd == -1)
{
int errcode = errno;
DEBUGASSERT(errcode > 0);
auderr("ERROR: Failed to open %s: %d\n", -errcode);
UNUSED(errcode);
return -ENOENT;
}
return OK;
}
/* Device not found */
auderr("ERROR: Device not found\n");
precorder->dev_fd = -1;
return -ENODEV;
}
/****************************************************************************
* Name: nxrecorder_writebuffer
*
* Write the next block of data to the pcm raw data file into the specified
* buffer.
*
****************************************************************************/
static int nxrecorder_writebuffer(FAR struct nxrecorder_s *precorder,
FAR struct ap_buffer_s *apb)
{
int ret;
/* Validate the file is still open. It will be closed automatically when
* we encounter the end of file (or, perhaps, a write error that we cannot
* handle.
*/
if (precorder->fd == -1)
{
/* Return -ENODATA to indicate that there is nothing more to write to
* the file.
*/
return -ENODATA;
}
/* Write data to the file. */
ret = write(precorder->fd, apb->samp, apb->nbytes);
if (ret < 0)
{
return ret;
}
apb->curbyte = 0;
apb->flags = 0;
/* Return OK to indicate that the buffer should be passed through to the
* audio device. This does not necessarily indicate that data was written
* correctly.
*/
return OK;
}
/****************************************************************************
* Name: nxrecorder_enqueuebuffer
*
* Description:
* Enqueue the audio buffer in the downstream device. Normally we are
* called with a buffer of data to be enqueued in the audio stream.
*
* Be we may also receive an empty length buffer (with only the
* AUDIO_APB_FINAL set) in the event of certain write error occurs or in
* the event that the file was an exact multiple of the nmaxbytes size of
* the audio buffer.
* In that latter case, we have an end of file with no bytes written.
*
* These infrequent zero length buffers have to be passed through because
* the include the AUDIO_APB_FINAL flag that is needed to terminate the
* audio stream.
*
****************************************************************************/
static int nxrecorder_enqueuebuffer(FAR struct nxrecorder_s *precorder,
FAR struct ap_buffer_s *apb)
{
struct audio_buf_desc_s bufdesc;
int ret;
/* Now enqueue the buffer with the audio device. If the number of
* bytes in the file happens to be an exact multiple of the audio
* buffer size, then we will receive the last buffer size = 0. We
* encode this buffer also so the audio system knows its the end of
* the file and can do proper clean-up.
*/
apb->nbytes = apb->nmaxbytes;
#ifdef CONFIG_AUDIO_MULTI_SESSION
bufdesc.session = precorder->session;
#endif
bufdesc.numbytes = apb->nbytes;
bufdesc.u.buffer = apb;
ret = ioctl(precorder->dev_fd, AUDIOIOC_ENQUEUEBUFFER,
(unsigned long)&bufdesc);
if (ret < 0)
{
int errcode = errno;
DEBUGASSERT(errcode > 0);
auderr("ERROR: AUDIOIOC_ENQUEUEBUFFER ioctl failed: %d\n", errcode);
return -errcode;
}
/* Return OK to indicate that we successfully write data to the file
* (and we are not yet at the end of file)
*/
return OK;
}
/****************************************************************************
* Name: nxrecorder_thread_recordthread
*
* This is the thread that write the audio file file and enqueues /
* dequeues buffers from the selected and opened audio device.
*
****************************************************************************/
static void *nxrecorder_recordthread(pthread_addr_t pvarg)
{
struct nxrecorder_s *precorder = (struct nxrecorder_s *) pvarg;
struct audio_msg_s msg;
struct audio_buf_desc_s buf_desc;
ssize_t size;
bool running = true;
bool streaming = true;
bool failed = false;
struct ap_buffer_info_s buf_info;
FAR struct ap_buffer_s **pbuffers;
unsigned int prio;
#ifdef CONFIG_DEBUG_FEATURES
int outstanding = 0;
#endif
int x;
int ret;
audinfo("Entry\n");
/* Query the audio device for it's preferred buffer size / qty */
if ((ret = ioctl(precorder->dev_fd, AUDIOIOC_GETBUFFERINFO,
(unsigned long) &buf_info)) != OK)
{
/* Driver doesn't report it's buffer size. Use our default. */
buf_info.buffer_size = CONFIG_AUDIO_BUFFER_NUMBYTES;
buf_info.nbuffers = CONFIG_AUDIO_NUM_BUFFERS;
}
/* Create array of pointers to buffers */
pbuffers = (FAR struct ap_buffer_s **) malloc(buf_info.nbuffers *
sizeof(FAR void *));
if (pbuffers == NULL)
{
/* Error allocating memory for buffer storage! */
ret = -ENOMEM;
running = false;
goto err_out;
}
/* Create our audio pipeline buffers to use for queueing up data */
for (x = 0; x < buf_info.nbuffers; x++)
{
pbuffers[x] = NULL;
}
for (x = 0; x < buf_info.nbuffers; x++)
{
/* Fill in the buffer descriptor struct to issue an alloc request */
#ifdef CONFIG_AUDIO_MULTI_SESSION
buf_desc.session = precorder->session;
#endif
buf_desc.numbytes = buf_info.buffer_size;
buf_desc.u.pbuffer = &pbuffers[x];
ret = ioctl(precorder->dev_fd, AUDIOIOC_ALLOCBUFFER,
(unsigned long) &buf_desc);
if (ret != sizeof(buf_desc))
{
/* Buffer alloc Operation not supported or error allocating! */
auderr("ERROR: Could not allocate buffer %d\n", x);
running = false;
goto err_out;
}
}
/* Fill up the pipeline with enqueued buffers */
for (x = 0; x < buf_info.nbuffers; x++)
{
/* Write the next buffer of data */
ret = nxrecorder_enqueuebuffer(precorder, pbuffers[x]);
if (ret != OK)
{
/* Failed to enqueue the buffer. The driver is not happy with
* the buffer. Perhaps a encoder has detected something that it
* does not like in the stream and has stopped streaming. This
* would happen normally if we send a file in the incorrect format
* to an audio encoder.
*
* We must stop streaming as gracefully as possible. Close the
* file so that no further data is written.
*/
close(precorder->fd);
precorder->fd = -1;
/* We are no longer streaming data to the file. Be we will
* need to wait for any outstanding buffers to be recovered. We
* also still expect the audio driver to send a AUDIO_MSG_COMPLETE
* message after all queued buffers have been returned.
*/
streaming = false;
failed = true;
break;
}
#ifdef CONFIG_DEBUG_FEATURES
else
{
/* The audio driver has one more buffer */
outstanding++;
}
#endif
}
audinfo("%d buffers queued, running=%d streaming=%d\n",
x, running, streaming);
/* Start the audio device */
if (running && !failed)
{
#ifdef CONFIG_AUDIO_MULTI_SESSION
ret = ioctl(precorder->dev_fd, AUDIOIOC_START,
(unsigned long) precorder->session);
#else
ret = ioctl(precorder->dev_fd, AUDIOIOC_START, 0);
#endif
if (ret < 0)
{
/* Error starting the audio stream! We need to continue running
* in order to recover the audio buffers that have already been
* queued.
*/
failed = true;
}
}
if (running && !failed)
{
/* Indicate we are recording a file */
precorder->state = NXRECORDER_STATE_RECORDING;
}
/* Loop until we specifically break. running == true means that we are
* still looping waiting for the recordback to complete. All of the file
* data may have been sent (if streaming == false), but the recordback is
* not complete until we get the AUDIO_MSG_COMPLETE (or AUDIO_MSG_STOP)
* message
*
* The normal protocol for streaming errors detected by the audio driver
* is as follows:
*
* (1) The audio driver will indicated the error by returning a negated
* error value when the next buffer is enqueued. The upper level
* then knows that this buffer was not queue.
* (2) The audio driver must return all queued buffers using the
* AUDIO_MSG_DEQUEUE message, and
* (3) Terminate recording by sending the AUDIO_MSG_COMPLETE message.
*/
audinfo("%s\n", running ? "Recording..." : "Not running");
while (running)
{
/* Wait for a signal either from the Audio driver that it needs
* additional buffer data, or from a user-space signal to pause,
* stop, etc.
*/
size = mq_receive(precorder->mq, (FAR char *)&msg, sizeof(msg), &prio);
/* Validate a message was received */
if (size != sizeof(msg))
{
/* Interrupted by a signal? What to do? */
continue;
}
/* Perform operation based on message id */
switch (msg.msg_id)
{
/* An audio buffer is being dequeued by the driver */
case AUDIO_MSG_DEQUEUE:
#ifdef CONFIG_DEBUG_FEATURES
/* Make sure that we believe that the audio driver has at
* least one buffer.
*/
DEBUGASSERT(msg.u.ptr && outstanding > 0);
outstanding--;
#endif
/* Write data to the file directly into this buffer and
* re-enqueue it. streaming == true means that we have
* not yet hit the end-of-file.
*/
if (streaming)
{
/* Write the next buffer of data */
ret = nxrecorder_writebuffer(precorder, msg.u.ptr);
if (ret != OK)
{
/* Out of data. Stay in the loop until the device sends
* us a COMPLETE message, but stop trying to record more
* data.
*/
streaming = false;
}
/* Enqueue buffer by sending it to the audio driver */
else
{
ret = nxrecorder_enqueuebuffer(precorder, msg.u.ptr);
if (ret != OK)
{
/* There is some issue from the audio driver.
* Perhaps a problem in the file format?
*
* We must stop streaming as gracefully as possible.
* Close the file so that no further data is written.
*/
close(precorder->fd);
precorder->fd = -1;
/* Stop streaming and wait for buffers to be
* returned and to receive the AUDIO_MSG_COMPLETE
* indication.
*/
streaming = false;
failed = true;
}
#ifdef CONFIG_DEBUG_FEATURES
else
{
/* The audio driver has one more buffer */
outstanding++;
}
#endif
}
}
break;
/* Someone wants to stop the recordback. */
case AUDIO_MSG_STOP:
/* Send a stop message to the device */
audinfo("Stopping! outstanding=%d\n", outstanding);
#ifdef CONFIG_AUDIO_MULTI_SESSION
ioctl(precorder->dev_fd, AUDIOIOC_STOP,
(unsigned long) precorder->session);
#else
ioctl(precorder->dev_fd, AUDIOIOC_STOP, 0);
#endif
/* Stay in the running loop (without sending more data).
* we will need to recover our audio buffers. We will
* loop until AUDIO_MSG_COMPLETE is received.
*/
streaming = false;
break;
/* Message indicating the recordback is complete */
case AUDIO_MSG_COMPLETE:
audinfo("Record complete. outstanding=%d\n", outstanding);
running = false;
break;
/* Unknown / unsupported message ID */
default:
break;
}
}
/* Release our audio buffers and unregister / release the device */
err_out:
audinfo("Clean-up and exit\n");
if (pbuffers != NULL)
{
audinfo("Freeing buffers\n");
for (x = 0; x < buf_info.nbuffers; x++)
{
/* Fill in the buffer descriptor struct to issue a free request */
if (pbuffers[x] != NULL)
{
#ifdef CONFIG_AUDIO_MULTI_SESSION
buf_desc.session = pplayer->session;
#endif
buf_desc.u.buffer = pbuffers[x];
ioctl(precorder->dev_fd,
AUDIOIOC_FREEBUFFER,
(unsigned long) &buf_desc);
}
}
/* Free the pointers to the buffers */
free(pbuffers);
}
/* Unregister the message queue and release the session */
ioctl(precorder->dev_fd,
AUDIOIOC_UNREGISTERMQ,
(unsigned long) precorder->mq);
#ifdef CONFIG_AUDIO_MULTI_SESSION
ioctl(precorder->dev_fd,
AUDIOIOC_RELEASE,
(unsigned long) precorder->session);
#else
ioctl(precorder->dev_fd,
AUDIOIOC_RELEASE,
0);
#endif
/* Cleanup */
while (sem_wait(&precorder->sem) < 0)
{
}
/* Close the files */
if (0 < precorder->fd)
{
close(precorder->fd); /* Close the file */
precorder->fd = -1; /* Clear out the FD */
}
close(precorder->dev_fd); /* Close the device */
precorder->dev_fd = -1; /* Mark device as closed */
mq_close(precorder->mq); /* Close the message queue */
mq_unlink(precorder->mqname); /* Unlink the message queue */
precorder->state = NXRECORDER_STATE_IDLE; /* Go to IDLE */
sem_post(&precorder->sem); /* Release the semaphore */
/* The record thread is done with the context. Release it, which may
* actually cause the context to be freed if the creator has already
* abandoned (released) the context too.
*/
nxrecorder_release(precorder);
audinfo("Exit\n");
return NULL;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nxrecorder_pause
*
* nxrecorder_pause() pauses recordback without cancelling it.
*
****************************************************************************/
#ifndef CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME
int nxrecorder_pause(FAR struct nxrecorder_s *precorder)
{
int ret = OK;
if (precorder->state == NXRECORDER_STATE_RECORDING)
{
#ifdef CONFIG_AUDIO_MULTI_SESSION
ret = ioctl(precorder->dev_fd, AUDIOIOC_PAUSE,
(unsigned long) precorder->session);
#else
ret = ioctl(precorder->dev_fd, AUDIOIOC_PAUSE, 0);
#endif
if (ret == OK)
{
precorder->state = NXRECORDER_STATE_PAUSED;
}
}
return ret;
}
#endif /* CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME */
/****************************************************************************
* Name: nxrecorder_resume
*
* nxrecorder_resume() resumes recordback after a pause operation.
*
****************************************************************************/
#ifndef CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME
int nxrecorder_resume(FAR struct nxrecorder_s *precorder)
{
int ret = OK;
if (precorder->state == NXRECORDER_STATE_PAUSED)
{
#ifdef CONFIG_AUDIO_MULTI_SESSION
ret = ioctl(precorder->dev_fd, AUDIOIOC_RESUME,
(unsigned long) precorder->session);
#else
ret = ioctl(precorder->dev_fd, AUDIOIOC_RESUME, 0);
#endif
if (ret == OK)
{
precorder->state = NXRECORDER_STATE_RECORDING;
}
}
return ret;
}
#endif /* CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME */
/****************************************************************************
* Name: nxrecorder_setdevice
*
* nxrecorder_setdevice() sets the audio device to use with the provided
* nxrecorder context.
*
****************************************************************************/
int nxrecorder_setdevice(FAR struct nxrecorder_s *precorder,
FAR const char *pdevice)
{
int temp_fd;
DEBUGASSERT(precorder != NULL);
DEBUGASSERT(pdevice != NULL);
/* Try to open the device */
temp_fd = open(pdevice, O_RDWR);
if (temp_fd == -1)
{
/* Error opening the device */
return -ENOENT;
}
close(temp_fd);
/* Save the path and format capabilities of the device */
strncpy(precorder->device, pdevice, sizeof(precorder->device));
return OK;
}
/****************************************************************************
* Name: nxrecorder_stop
*
* nxrecorder_stop() stops the current recordback and closes the file and
* the associated device.
*
* Input:
* precorder Pointer to the initialized MRecorder context
*
****************************************************************************/
#ifndef CONFIG_AUDIO_EXCLUDE_STOP
int nxrecorder_stop(FAR struct nxrecorder_s *precorder)
{
struct audio_msg_s term_msg;
FAR void *value;
DEBUGASSERT(precorder != NULL);
/* Validate we are not in IDLE state */
sem_wait(&precorder->sem); /* Get the semaphore */
if (precorder->state == NXRECORDER_STATE_IDLE)
{
sem_post(&precorder->sem); /* Release the semaphore */
return OK;
}
sem_post(&precorder->sem);
/* Notify the recordback thread that it needs to cancel the recordback */
term_msg.msg_id = AUDIO_MSG_STOP;
term_msg.u.data = 0;
mq_send(precorder->mq, (FAR const char *)&term_msg, sizeof(term_msg),
CONFIG_NXRECORDER_MSG_PRIO);
/* Join the thread. The thread will do all the cleanup. */
pthread_join(precorder->record_id, &value);
precorder->record_id = 0;
return OK;
}
#endif /* CONFIG_AUDIO_EXCLUDE_STOP */
/****************************************************************************
* Name: nxrecorder_recordraw
*
* nxrecorder_recordraw() tries to record the raw data file using the Audio
* system. If a device is specified, it will try to use that
* device.
* Input:
* precorder Pointer to the initialized MRecorder context
* pfilename Pointer to the filename to record
* nchannels channel num
* bpsampe bit width
* samprate sample rate
*
* Returns:
* OK File is being recorded
* -EBUSY The media device is busy
* -ENOSYS The media file is an unsupported type
* -ENODEV No audio device suitable to record the media type
* -ENOENT The media file was not found
*
****************************************************************************/
int nxrecorder_recordraw(FAR struct nxrecorder_s *precorder,
FAR const char *pfilename, uint8_t nchannels,
uint8_t bpsamp, uint32_t samprate)
{
struct mq_attr attr;
struct sched_param sparam;
pthread_attr_t tattr;
struct audio_caps_desc_s cap_desc;
FAR void *value;
int ret;
DEBUGASSERT(precorder != NULL);
DEBUGASSERT(pfilename != NULL);
if (precorder->state != NXRECORDER_STATE_IDLE)
{
return -EBUSY;
}
audinfo("==============================\n");
audinfo("Recording file %s\n", pfilename);
audinfo("==============================\n");
/* Test that the specified file exists */
if ((precorder->fd = open(pfilename, O_WRONLY | O_CREAT | O_TRUNC)) == -1)
{
/* File not found. Test if its in the mediadir */
auderr("ERROR: Could not open %s\n", pfilename);
return -ENOENT;
}
/* Try to open the device */
ret = nxrecorder_opendevice(precorder);
if (ret < 0)
{
/* Error opening the device */
auderr("ERROR: nxrecorder_opendevice failed: %d\n", ret);
goto err_out_nodev;
}
/* Try to reserve the device */
#ifdef CONFIG_AUDIO_MULTI_SESSION
ret = ioctl(precorder->dev_fd, AUDIOIOC_RESERVE,
(unsigned long)&precorder->session);
#else
ret = ioctl(precorder->dev_fd, AUDIOIOC_RESERVE, 0);
#endif
if (ret < 0)
{
/* Device is busy or error */
auderr("ERROR: Failed to reserve device: %d\n", ret);
ret = -errno;
goto err_out;
}
#ifdef CONFIG_AUDIO_MULTI_SESSION
cap_desc.session = precorder->session;
#endif
cap_desc.caps.ac_len = sizeof(struct audio_caps_s);
cap_desc.caps.ac_type = AUDIO_TYPE_INPUT;
cap_desc.caps.ac_channels = nchannels ? nchannels : 2;
cap_desc.caps.ac_controls.hw[0] = samprate ? samprate : 48000;
cap_desc.caps.ac_controls.b[3] = samprate >> 16;
cap_desc.caps.ac_controls.b[2] = bpsamp ? bpsamp : 16;
ret = ioctl(precorder->dev_fd, AUDIOIOC_CONFIGURE,
(unsigned long)&cap_desc);
if (ret < 0)
{
ret = -errno;
goto err_out;
}
/* Create a message queue for the recordthread */
attr.mq_maxmsg = 16;
attr.mq_msgsize = sizeof(struct audio_msg_s);
attr.mq_curmsgs = 0;
attr.mq_flags = 0;
snprintf(precorder->mqname, sizeof(precorder->mqname), "/tmp/%0lx",
(unsigned long)((uintptr_t)precorder));
precorder->mq = mq_open(precorder->mqname, O_RDWR | O_CREAT, 0644, &attr);
if (precorder->mq == NULL)
{
/* Unable to open message queue! */
ret = -errno;
auderr("ERROR: mq_open failed: %d\n", ret);
goto err_out;
}
/* Register our message queue with the audio device */
ioctl(precorder->dev_fd,
AUDIOIOC_REGISTERMQ,
(unsigned long)precorder->mq);
/* Check if there was a previous thread and join it if there was
* to perform clean-up.
*/
if (precorder->record_id != 0)
{
pthread_join(precorder->record_id, &value);
}
/* Start the recordfile thread to stream the media file to the
* audio device.
*/
pthread_attr_init(&tattr);
sparam.sched_priority = sched_get_priority_max(SCHED_FIFO) - 9;
pthread_attr_setschedparam(&tattr, &sparam);
pthread_attr_setstacksize(&tattr,
CONFIG_NXRECORDER_RECORDTHREAD_STACKSIZE);
/* Add a reference count to the recorder for the thread and start the
* thread. We increment for the thread to avoid thread start-up
* race conditions.
*/
nxrecorder_reference(precorder);
ret = pthread_create(&precorder->record_id,
&tattr,
nxrecorder_recordthread,
(pthread_addr_t) precorder);
if (ret != OK)
{
auderr("ERROR: Failed to create recordthread: %d\n", ret);
goto err_out;
}
/* Name the thread */
pthread_setname_np(precorder->record_id, "recordthread");
return OK;
err_out:
close(precorder->dev_fd);
precorder->dev_fd = -1;
err_out_nodev:
if (0 < precorder->fd)
{
close(precorder->fd);
precorder->fd = -1;
}
return ret;
}
/****************************************************************************
* Name: nxrecorder_create
*
* nxrecorder_create() allocates and initializes a nxrecorder context for
* use by further nxrecorder operations. This routine must be called
* before to perform the create for proper reference counting.
*
* Input Parameters: None
*
* Returned values:
* Pointer to the created context or NULL if there was an error.
*
****************************************************************************/
FAR struct nxrecorder_s *nxrecorder_create(void)
{
FAR struct nxrecorder_s *precorder;
/* Allocate the memory */
precorder = (FAR struct nxrecorder_s *) malloc(
sizeof(struct nxrecorder_s));
if (precorder == NULL)
{
return NULL;
}
/* Initialize the context data */
precorder->state = NXRECORDER_STATE_IDLE;
precorder->dev_fd = -1;
precorder->fd = -1;
precorder->device[0] = '\0';
precorder->mq = NULL;
precorder->record_id = 0;
precorder->crefs = 1;
#ifdef CONFIG_AUDIO_MULTI_SESSION
precorder->session = NULL;
#endif
sem_init(&precorder->sem, 0, 1);
return precorder;
}
/****************************************************************************
* Name: nxrecorder_release
*
* nxrecorder_release() reduces the reference count by one and if it
* reaches zero, frees the context.
*
* Input Parameters:
* precorder Pointer to the NxRecorder context
*
* Returned values: None
*
****************************************************************************/
void nxrecorder_release(FAR struct nxrecorder_s *precorder)
{
int refcount;
FAR void *value;
/* Grab the semaphore */
while (sem_wait(&precorder->sem) < 0)
{
int errcode = errno;
DEBUGASSERT(errcode > 0);
if (errcode != EINTR)
{
auderr("ERROR: sem_wait failed: %d\n", errcode);
return;
}
}
/* Check if there was a previous thread and join it if there was */
if (precorder->record_id != 0)
{
sem_post(&precorder->sem);
pthread_join(precorder->record_id, &value);
precorder->record_id = 0;
while (sem_wait(&precorder->sem) < 0)
{
int errcode = errno;
DEBUGASSERT(errcode > 0);
if (errcode != EINTR)
{
auderr("ERROR: sem_wait failed: %d\n", errcode);
return;
}
}
}
/* Reduce the reference count */
refcount = precorder->crefs--;
sem_post(&precorder->sem);
/* If the ref count *was* one, then free the context */
if (refcount == 1)
{
free(precorder);
}
}
/****************************************************************************
* Name: nxrecorder_reference
*
* nxrecorder_reference() increments the reference count by one.
*
* Input Parameters:
* precorder Pointer to the NxRecorder context
*
* Returned values: None
*
****************************************************************************/
void nxrecorder_reference(FAR struct nxrecorder_s *precorder)
{
/* Grab the semaphore */
while (sem_wait(&precorder->sem) < 0)
{
int errcode = errno;
DEBUGASSERT(errcode > 0);
if (errcode != EINTR)
{
auderr("ERROR: sem_wait failed: %d\n", errcode);
return;
}
}
/* Increment the reference count */
precorder->crefs++;
sem_post(&precorder->sem);
}
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