/**************************************************************************** * 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 * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include /**************************************************************************** * 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[0] = 0; caps->ac_format[1] = 0; caps->ac_controls[0] = 0; caps->ac_controls[1] = 0; caps->ac_controls[2] = 0; caps->ac_controls[3] = 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[0] = AUDIO_TYPE_OUTPUT | AUDIO_TYPE_FEATURE | AUDIO_TYPE_PROCESSING; break; case AUDIO_FMT_MIDI: /* We only support Format 0 */ caps->ac_controls[0] = AUDIO_SUBFMT_END; break; default: caps->ac_controls[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[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[0] = AUDIO_FU_VOLUME | AUDIO_FU_BASS | AUDIO_FU_TREBLE; caps->ac_controls[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[0] = AUDIO_PU_STEREO_EXTENDER; break; case AUDIO_PU_STEREO_EXTENDER: /* Provide capabilities of our Stereo Extender */ caps->ac_controls[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 (*((uint16_t *)caps->ac_format)) { #ifndef CONFIG_AUDIO_EXCLUDE_VOLUME case AUDIO_FU_VOLUME: audvdbg(" Volume: %d\n", *(uint16_t *)caps->ac_controls); break; #endif /* CONFIG_AUDIO_EXCLUDE_VOLUME */ #ifndef CONFIG_AUDIO_EXCLUDE_TONE case AUDIO_FU_BASS: audvdbg(" Bass: %d\n", caps->ac_controls[0]); break; case AUDIO_FU_TREBLE: audvdbg(" Treble: %d\n", caps->ac_controls[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", *(uint16_t*)&ac_controls[0]); audvdbg(" Sample width: %u\n", ac_controls[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 */ 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) { /* Take a reference */ apb_reference(apb); 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; /* Release the reference and return success */ apb_free(apb); 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; }