Add AudioRecordQueue (work in progress)

Audio.h

 #include "play_queue.h"
 #include "play_sd_raw.h"
 #include "play_sd_wav.h"
+#include "record_queue.h"
 #include "synth_tonesweep.h"
 #include "synth_sine.h"
 #include "synth_waveform.h"

gui/list.html

 
 
 
+<script type="text/javascript">
+	RED.nodes.registerType('AudioRecordQueue',{
+	shortName: "queue",
+		inputs:1,
+		outputs:0,
+		category: 'record-function',
+		color:"#E6E0F8",
+		icon: "arrow-in.png"
+	});
+</script>
+<script type="text/x-red" data-help-name="AudioRecordQueue">
+	<h3>Summary</h3>
+	<p>Record audio data by sending to the Arduino sketch.  This object allows
+		sketch code to receive audio packets.</p>
+	<h3>Audio Connections</h3>
+	<table class=doc align=center cellpadding=3>
+		<tr class=top><th>Port</th><th>Purpose</th></tr>
+		<tr class=odd><td align=center>In 0</td><td>Sound To Access</td></tr>
+	</table>
+	<h3>Functions</h3>
+	<p class=func><span class=keyword>available</span>();</p>
+	<p class=desc>Returns the number of audio packets available to read.
+	</p>
+	<p class=func><span class=keyword>readBuffer</span>();</p>
+	<p class=desc>Read a single audio packet.  A pointer to a 128 sample
+		array of 16 bit integers is returned.  NULL is returned if no packets
+		are available.
+	</p>
+	<p class=func><span class=keyword>freeBuffer</span>();</p>
+	<p class=desc>Release the memory from the previously read packet returned
+		from readBuffer().  Only a single packet at a time may be read, and
+		each packet must be freed with this function, to return the memory to
+		the audio library.
+	</p>
+	<h3>Notes</h3>
+	<p>TODO: many caveats....</p>
+	<p>
+		Up to 52 packets may be queued by this object, which allows approximately
+		150 ms of audio to be held in the queue, to allow time for the Arduino
+		sketch to write data to media or do other high-latency tasks.
+
+The actual packets are taken
+		from the pool created by AudioMemory().
+	</p>
+</script>
+<script type="text/x-red" data-template-name="AudioRecordQueue">
+	<div class="form-row">
+		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
+		<input type="text" id="node-input-name" placeholder="Name">
+	</div>
+</script>
+
+
+
+
+
 <script type="text/javascript">
 	RED.nodes.registerType('AudioSynthWaveformSine',{
 	shortName: "sine",

record_queue.cpp

+/* Audio Library for Teensy 3.X
+ * Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com
+ *
+ * Development of this audio library was funded by PJRC.COM, LLC by sales of
+ * Teensy and Audio Adaptor boards.  Please support PJRC's efforts to develop
+ * open source software by purchasing Teensy or other PJRC products.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice, development funding notice, and this permission
+ * notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "record_queue.h"
+#include "utility/dspinst.h"
+
+
+int AudioRecordQueue::available(void)
+{
+	uint32_t h, t;
+
+	h = head;
+	t = tail;
+	if (h > t) return h - t;
+	return 53 + h - t;
+}
+
+
+int16_t * AudioRecordQueue::readBuffer(void)
+{
+	audio_block_t *block;
+	uint32_t t;
+
+	if (userblock) return NULL;
+	t = tail;
+	if (t == head) return NULL;
+	if (++t >= 53) t = 0;
+	userblock = queue[t];
+	tail = t;
+	return userblock->data;
+}
+
+void AudioRecordQueue::freeBuffer(void)
+{
+	if (userblock == NULL) return;
+	release(userblock);
+	userblock = NULL;
+}
+
+void AudioRecordQueue::update(void)
+{
+	audio_block_t *block;
+	uint32_t h;
+
+	block = receiveReadOnly();
+	if (!block) return;
+	h = head + 1;
+	if (h >= 53) h = 0;
+	if (h == tail) {
+		release(block);
+	} else {
+		queue[h] = block;
+		head = h;
+	}
+}
+
+

record_queue.h

+/* Audio Library for Teensy 3.X
+ * Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com
+ *
+ * Development of this audio library was funded by PJRC.COM, LLC by sales of
+ * Teensy and Audio Adaptor boards.  Please support PJRC's efforts to develop
+ * open source software by purchasing Teensy or other PJRC products.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice, development funding notice, and this permission
+ * notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef record_queue_h_
+#define record_queue_h_
+
+#include "AudioStream.h"
+
+class AudioRecordQueue : public AudioStream
+{
+public:
+	AudioRecordQueue(void) : AudioStream(0, NULL),
+		userblock(NULL), head(0), tail(0) { }
+	int available(void);
+	int16_t * readBuffer(void);
+	void freeBuffer(void);
+	virtual void update(void);
+private:
+	audio_block_t *inputQueueArray[1];
+	audio_block_t *queue[53];
+	audio_block_t *userblock;
+	volatile uint8_t head, tail;
+};
+
+#endif