BasebandProcessor interface change to pass references, not copies.

firmware/baseband/baseband_processor.cpp

@@ -59,7 +59,7 @@ void BasebandProcessor::update_spectrum() {
 	}
 }
 
-void BasebandProcessor::feed_channel_stats(const buffer_c16_t channel) {
+void BasebandProcessor::feed_channel_stats(const buffer_c16_t& channel) {
 	channel_stats.feed(
 		channel,
 		[this](const ChannelStatistics statistics) {
@@ -69,7 +69,7 @@ void BasebandProcessor::feed_channel_stats(const buffer_c16_t channel) {
 }
 
 void BasebandProcessor::feed_channel_spectrum(
-	const buffer_c16_t channel,
+	const buffer_c16_t& channel,
 	const uint32_t filter_pass_frequency,
 	const uint32_t filter_stop_frequency
 ) {
@@ -83,7 +83,7 @@ void BasebandProcessor::feed_channel_spectrum(
 	);
 }
 
-void BasebandProcessor::fill_audio_buffer(const buffer_s16_t audio) {
+void BasebandProcessor::fill_audio_buffer(const buffer_s16_t& audio) {
 	auto audio_buffer = audio::dma::tx_empty_buffer();;
 	for(size_t i=0; i<audio_buffer.count; i++) {
 		audio_buffer.p[i].left = audio_buffer.p[i].right = audio.p[i];
@@ -93,12 +93,12 @@ void BasebandProcessor::fill_audio_buffer(const buffer_s16_t audio) {
 	feed_audio_stats(audio);
 }
 
-void BasebandProcessor::post_channel_stats_message(const ChannelStatistics statistics) {
+void BasebandProcessor::post_channel_stats_message(const ChannelStatistics& statistics) {
 	channel_stats_message.statistics = statistics;
 	shared_memory.application_queue.push(channel_stats_message);
 }
 
-void BasebandProcessor::post_channel_spectrum_message(const buffer_c16_t data) {
+void BasebandProcessor::post_channel_spectrum_message(const buffer_c16_t& data) {
 	if( !channel_spectrum_request_update ) {
 		fft_swap(data, channel_spectrum);
 		channel_spectrum_sampling_rate = data.sampling_rate;
@@ -107,7 +107,7 @@ void BasebandProcessor::post_channel_spectrum_message(const buffer_c16_t data) {
 	}
 }
 
-void BasebandProcessor::feed_audio_stats(const buffer_s16_t audio) {
+void BasebandProcessor::feed_audio_stats(const buffer_s16_t& audio) {
 	audio_stats.feed(
 		audio,
 		[this](const AudioStatistics statistics) {
@@ -116,7 +116,7 @@ void BasebandProcessor::feed_audio_stats(const buffer_s16_t audio) {
 	);
 }
 
-void BasebandProcessor::post_audio_stats_message(const AudioStatistics statistics) {
+void BasebandProcessor::post_audio_stats_message(const AudioStatistics& statistics) {
 	audio_stats_message.statistics = statistics;
 	shared_memory.application_queue.push(audio_stats_message);
 }

firmware/baseband/baseband_processor.hpp

@@ -37,20 +37,20 @@ class BasebandProcessor {
 public:
 	virtual ~BasebandProcessor() = default;
 
-	virtual void execute(buffer_c8_t buffer) = 0;
+	virtual void execute(buffer_c8_t& buffer) = 0;
 
 	void update_spectrum();
 
 protected:
-	void feed_channel_stats(const buffer_c16_t channel);
+	void feed_channel_stats(const buffer_c16_t& channel);
 
 	void feed_channel_spectrum(
-		const buffer_c16_t channel,
+		const buffer_c16_t& channel,
 		const uint32_t filter_pass_frequency,
 		const uint32_t filter_stop_frequency
 	);
 
-	void fill_audio_buffer(const buffer_s16_t audio);
+	void fill_audio_buffer(const buffer_s16_t& audio);
 
 	volatile bool channel_spectrum_request_update { false };
 	std::array<std::complex<float>, 256> channel_spectrum;
@@ -67,10 +67,10 @@ private:
 	AudioStatsCollector audio_stats;
 	AudioStatisticsMessage audio_stats_message;
 
-	void post_channel_stats_message(const ChannelStatistics statistics);
-	void post_channel_spectrum_message(const buffer_c16_t data);
-	void feed_audio_stats(const buffer_s16_t audio);
-	void post_audio_stats_message(const AudioStatistics statistics);
+	void post_channel_stats_message(const ChannelStatistics& statistics);
+	void post_channel_spectrum_message(const buffer_c16_t& data);
+	void feed_audio_stats(const buffer_s16_t& audio);
+	void post_audio_stats_message(const AudioStatistics& statistics);
 };
 
 #endif/*__BASEBAND_PROCESSOR_H__*/

firmware/baseband/main.cpp

@@ -135,7 +135,7 @@ private:
 		while(true) {
 			// TODO: Place correct sampling rate into buffer returned here:
 			const auto buffer_tmp = baseband::dma::wait_for_rx_buffer();
-			const buffer_c8_t buffer {
+			buffer_c8_t buffer {
 				buffer_tmp.p, buffer_tmp.count, baseband_configuration.sampling_rate
 			};
 

firmware/baseband/proc_ais.cpp

@@ -26,7 +26,7 @@
 #include "i2s.hpp"
 using namespace lpc43xx;
 
-void AISProcessor::execute(buffer_c8_t buffer) {
+void AISProcessor::execute(buffer_c8_t& buffer) {
 	/* 2.4576MHz, 2048 samples */
 
 	auto decimator_out = decimator.execute(buffer);

firmware/baseband/proc_ais.hpp

@@ -42,7 +42,7 @@
 
 class AISProcessor : public BasebandProcessor {
 public:
-	void execute(buffer_c8_t buffer) override;
+	void execute(buffer_c8_t& buffer) override;
 
 private:
 	ChannelDecimator decimator { ChannelDecimator::DecimationFactor::By32 };

firmware/baseband/proc_am_audio.cpp

@@ -23,7 +23,7 @@
 
 #include <cstdint>
 
-void NarrowbandAMAudio::execute(buffer_c8_t buffer) {
+void NarrowbandAMAudio::execute(buffer_c8_t& buffer) {
 	auto decimator_out = decimator.execute(buffer);
 
 	const buffer_c16_t work_baseband_buffer {

firmware/baseband/proc_am_audio.hpp

@@ -38,7 +38,7 @@ public:
 		channel_filter.configure(channel_filter_taps.taps, 2);
 	}
 
-	void execute(buffer_c8_t buffer) override;
+	void execute(buffer_c8_t& buffer) override;
 
 private:
 	ChannelDecimator decimator;

firmware/baseband/proc_ert.cpp

@@ -41,7 +41,7 @@ float ERTProcessor::abs(const complex8_t& v) {
 	return std::sqrt(r2_i2);
 }
 
-void ERTProcessor::execute(buffer_c8_t buffer) {
+void ERTProcessor::execute(buffer_c8_t& buffer) {
 	/* 4.194304MHz, 2048 samples */
 	// auto decimator_out = decimator.execute(buffer);
 

firmware/baseband/proc_ert.hpp

@@ -50,7 +50,7 @@ constexpr size_t idm_payload_length_max { 1408 };
 
 class ERTProcessor : public BasebandProcessor {
 public:
-	void execute(buffer_c8_t buffer) override;
+	void execute(buffer_c8_t& buffer) override;
 
 private:
 	const uint32_t baseband_sampling_rate = 4194304;

firmware/baseband/proc_nfm_audio.cpp

@@ -24,7 +24,7 @@
 #include <cstdint>
 #include <cstddef>
 
-void NarrowbandFMAudio::execute(buffer_c8_t buffer) {
+void NarrowbandFMAudio::execute(buffer_c8_t& buffer) {
 	/* Called every 2048/3072000 second -- 1500Hz. */
 
 	auto decimator_out = decimator.execute(buffer);

firmware/baseband/proc_nfm_audio.hpp

@@ -39,7 +39,7 @@ public:
 		channel_filter.configure(channel_filter_taps.taps, 2);
 	}
 
-	void execute(buffer_c8_t buffer) override;
+	void execute(buffer_c8_t& buffer) override;
 
 private:
 	ChannelDecimator decimator;

firmware/baseband/proc_tpms.cpp

@@ -26,7 +26,7 @@
 #include "i2s.hpp"
 using namespace lpc43xx;
 
-void TPMSProcessor::execute(buffer_c8_t buffer) {
+void TPMSProcessor::execute(buffer_c8_t& buffer) {
 	/* 2.4576MHz, 2048 samples */
 
 	auto decimator_out = decimator.execute(buffer);

firmware/baseband/proc_tpms.hpp

@@ -50,7 +50,7 @@ constexpr std::array<std::complex<float>, 8> rect_taps_153k6_1t_p { {
 
 class TPMSProcessor : public BasebandProcessor {
 public:
-	void execute(buffer_c8_t buffer) override;
+	void execute(buffer_c8_t& buffer) override;
 
 private:
 	ChannelDecimator decimator { ChannelDecimator::DecimationFactor::By16 };

firmware/baseband/proc_wfm_audio.cpp

@@ -23,7 +23,7 @@
 
 #include <cstdint>
 
-void WidebandFMAudio::execute(buffer_c8_t buffer) {
+void WidebandFMAudio::execute(buffer_c8_t& buffer) {
 	auto decimator_out = decimator.execute(buffer);
 
 	const buffer_s16_t work_audio_buffer {

firmware/baseband/proc_wfm_audio.hpp

@@ -37,7 +37,7 @@ public:
 		decimator.set_decimation_factor(ChannelDecimator::DecimationFactor::By4);
 	}
 
-	void execute(buffer_c8_t buffer) override;
+	void execute(buffer_c8_t& buffer) override;
 
 private:
 	ChannelDecimator decimator;

firmware/baseband/proc_wideband_spectrum.cpp

@@ -33,7 +33,7 @@ using namespace lpc43xx;
 
 #include <array>
 
-void WidebandSpectrum::execute(buffer_c8_t buffer) {
+void WidebandSpectrum::execute(buffer_c8_t& buffer) {
 	// 2048 complex8_t samples per buffer.
 	// 102.4us per buffer. 20480 instruction cycles per buffer.
 

firmware/baseband/proc_wideband_spectrum.hpp

@@ -30,7 +30,7 @@
 
 class WidebandSpectrum : public BasebandProcessor {
 public:
-	void execute(buffer_c8_t buffer) override;
+	void execute(buffer_c8_t& buffer) override;
 
 private:
 	size_t sample_count = 0;