Semi-naive audio recording to SD card.

firmware/baseband/audio_output.cpp

@@ -83,15 +83,21 @@ void AudioOutput::on_block(
 		}
 	}
 
-	fill_audio_buffer(audio);
+	fill_audio_buffer(audio, audio_present);
 }
 
-void AudioOutput::fill_audio_buffer(const buffer_f32_t& audio) {
+void AudioOutput::fill_audio_buffer(const buffer_f32_t& audio, const bool send_to_fifo) {
+	std::array<int16_t, 32> audio_int;
+
 	auto audio_buffer = audio::dma::tx_empty_buffer();
 	for(size_t i=0; i<audio_buffer.count; i++) {
 		const int32_t sample_int = audio.p[i] * k;
 		const int32_t sample_saturated = __SSAT(sample_int, 16);
 		audio_buffer.p[i].left = audio_buffer.p[i].right = sample_saturated;
+		audio_int[i] = sample_saturated;
+	}
+	if( send_to_fifo ) {
+		stream.write(audio_int.data(), audio_int.size() * sizeof(int16_t));
 	}
 
 	feed_audio_stats(audio);

firmware/baseband/audio_output.hpp

@@ -27,6 +27,7 @@
 #include "dsp_iir.hpp"
 #include "dsp_squelch.hpp"
 
+#include "stream_input.hpp"
 #include "block_decimator.hpp"
 #include "audio_stats_collector.hpp"
 
@@ -53,12 +54,14 @@ private:
 	IIRBiquadFilter deemph;
 	FMSquelch squelch;
 
+	StreamInput stream;
+
 	AudioStatsCollector audio_stats;
 
 	uint64_t audio_present_history = 0;
 
 	void on_block(const buffer_f32_t& audio);
-	void fill_audio_buffer(const buffer_f32_t& audio);
+	void fill_audio_buffer(const buffer_f32_t& audio, const bool send_to_fifo);
 	void feed_audio_stats(const buffer_f32_t& audio);
 };
 

firmware/baseband/stream_input.hpp

@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2016 Jared Boone, ShareBrained Technology, Inc.
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __STREAM_INPUT_H__
+#define __STREAM_INPUT_H__
+
+#include "portapack_shared_memory.hpp"
+
+#include "fifo.hpp"
+
+#include <cstdint>
+#include <cstddef>
+#include <memory>
+
+class StreamInput {
+public:
+	StreamInput() : fifo { std::make_unique<FIFO<uint8_t, 13>>() }
+	{
+		// TODO: Send stream creation message.
+		shared_memory.FIFO_HACK = fifo.get();
+	}
+
+	~StreamInput() {
+		// TODO: Send stream distruction message.
+		shared_memory.FIFO_HACK = nullptr;
+	}
+
+	size_t write(const void* const data, const size_t length) {
+		return fifo->in(reinterpret_cast<const uint8_t*>(data), length);
+	}
+
+private:
+	std::unique_ptr<FIFO<uint8_t, 13>> fifo;
+};
+
+#endif/*__STREAM_INPUT_H__*/