Add mode autodetection + update mode toggle to function as autodetect off/on

app/build.gradle

@@ -8,8 +8,8 @@ android {
         applicationId "org.cimbar.camerafilecopy"
         minSdkVersion 21
         targetSdkVersion 30
-        versionCode 13
-        versionName "0.6.0f"
+        versionCode 14
+        versionName "0.6.1"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
         externalNativeBuild {
             cmake {

app/src/cpp/cfc-cpp/MultiThreadedDecoder.h

@@ -15,8 +15,9 @@
 class MultiThreadedDecoder
 {
 public:
-	MultiThreadedDecoder(std::string data_path, bool legacy_mode);
+	MultiThreadedDecoder(std::string data_path, int mode_val);
 
+	inline static clock_t count = 0;
 	inline static clock_t bytes = 0;
 	inline static clock_t perfect = 0;
 	inline static clock_t decoded = 0;
@@ -29,7 +30,10 @@ class MultiThreadedDecoder
 
 	void stop();
 
-	bool legacy_mode() const;
+	int mode() const;
+	bool set_mode(int mode_val);
+	int detected_mode() const;
+
 	unsigned num_threads() const;
 	unsigned backlog() const;
 	unsigned files_in_flight() const;
@@ -41,21 +45,26 @@ class MultiThreadedDecoder
 	int do_extract(const cv::Mat& mat, cv::Mat& img);
 	void save(const cv::Mat& img);
 
+	static unsigned fountain_chunk_size(int mode_val);
+
 protected:
-	bool _legacyMode;
+	int _modeVal;
+	int _detectedMode;
+
 	Decoder _dec;
 	unsigned _numThreads;
 	turbo::thread_pool _pool;
 	concurrent_fountain_decoder_sink<cimbar::zstd_decompressor<std::ofstream>> _writer;
 	std::string _dataPath;
 };
 
-inline MultiThreadedDecoder::MultiThreadedDecoder(std::string data_path, bool legacy_mode)
-	: _legacyMode(legacy_mode)
-	, _dec(cimbar::Config::ecc_bytes(), cimbar::Config::color_bits(), legacy_mode? 0 : 1, legacy_mode)
+inline MultiThreadedDecoder::MultiThreadedDecoder(std::string data_path, int mode_val)
+	: _modeVal(mode_val)
+	, _detectedMode(0)
+	, _dec(cimbar::Config::ecc_bytes(), cimbar::Config::color_bits())
 	, _numThreads(std::max<int>(((int)std::thread::hardware_concurrency()/2), 1))
 	, _pool(_numThreads, 1)
-	, _writer(data_path, cimbar::Config::fountain_chunk_size(cimbar::Config::ecc_bytes(), cimbar::Config::symbol_bits() + cimbar::Config::color_bits(), legacy_mode))
+	, _writer(data_path, fountain_chunk_size(mode_val))
 	, _dataPath(data_path)
 {
 	FountainInit::init();
@@ -87,7 +96,9 @@ inline int MultiThreadedDecoder::do_extract(const cv::Mat& mat, cv::Mat& img)
 
 inline bool MultiThreadedDecoder::add(cv::Mat mat)
 {
-	return _pool.try_execute( [&, mat] () {
+    ++count;
+    bool legacy_mode = _modeVal == 4 or (_modeVal == 0 and count%2 == 0);
+    return _pool.try_execute( [&, mat, legacy_mode] () {
 		cv::Mat img;
 		int res = do_extract(mat, img);
 		if (res == Extractor::FAILURE)
@@ -96,12 +107,16 @@ inline bool MultiThreadedDecoder::add(cv::Mat mat)
 		// if extracted image is small, we'll need to run some filters on it
 		clock_t begin = clock();
 		bool should_preprocess = (res == Extractor::NEEDS_SHARPEN);
-		int color_correction = _legacyMode? 1 : 2;
-		unsigned decodeRes = _dec.decode_fountain(img, _writer, should_preprocess, color_correction);
+		int color_correction = legacy_mode? 1 : 2;
+		unsigned color_mode = legacy_mode? 0 : 1;
+		unsigned decodeRes = _dec.decode_fountain(img, _writer, color_mode, should_preprocess, color_correction);
 		bytes += decodeRes;
 		++decoded;
 		decodeTicks += clock() - begin;
 
+		if (decodeRes and _modeVal == 0)
+            _detectedMode = legacy_mode? 4 : 68;
+
 		if (decodeRes >= 6900)
 			++perfect;
 	} );
@@ -121,9 +136,35 @@ inline void MultiThreadedDecoder::stop()
 	_pool.stop();
 }
 
-inline bool MultiThreadedDecoder::legacy_mode() const
+unsigned MultiThreadedDecoder::fountain_chunk_size(int mode_val)
+{
+	return cimbar::Config::fountain_chunk_size(cimbar::Config::ecc_bytes(), cimbar::Config::symbol_bits() + cimbar::Config::color_bits(), mode_val==4);
+}
+
+inline int MultiThreadedDecoder::mode() const
+{
+	return _modeVal;
+}
+
+inline bool MultiThreadedDecoder::set_mode(int mode_val)
+{
+	if (_modeVal == mode_val)
+		return true;
+
+	if (mode_val != 0 and _writer.chunk_size() != fountain_chunk_size(mode_val))
+		return false; // if so, we need to reset to change it
+
+	// reset detectedMode iff we're switching back to autodetect
+	if (mode_val == 0)
+		_detectedMode = 0;
+
+	_modeVal = mode_val;
+	return true;
+}
+
+inline int MultiThreadedDecoder::detected_mode() const
 {
-	return _legacyMode;
+	return _detectedMode;
 }
 
 inline unsigned MultiThreadedDecoder::num_threads() const

app/src/cpp/cfc-cpp/jni.cpp

@@ -3,6 +3,7 @@
 #include "cimb_translator/CimbReader.h"
 #include "encoder/Decoder.h"
 #include "extractor/Scanner.h"
+#include "serialize/format.h"
 
 #include <jni.h>
 #include <android/log.h>
@@ -123,8 +124,8 @@ namespace {
 	void drawDebugInfo(cv::Mat& mat, MultiThreadedDecoder& proc)
 	{
 		std::stringstream sstop;
-		sstop << "cfc using " << proc.num_threads() << " thread(s). " << proc.legacy_mode() << "..." << proc.backlog() << "? ";
-		sstop << (MultiThreadedDecoder::bytes / std::max<double>(1, MultiThreadedDecoder::decoded)) << "b v0.6.0f";
+		sstop << "cfc using " << proc.num_threads() << " thread(s). " << proc.mode() << ":" << proc.detected_mode() << "..." << proc.backlog() << "? ";
+		sstop << (MultiThreadedDecoder::bytes / std::max<double>(1, MultiThreadedDecoder::decoded)) << "b v0.6.1";
 		std::stringstream ssmid;
 		ssmid << "#: " << MultiThreadedDecoder::perfect << " / " << MultiThreadedDecoder::decoded << " / " << MultiThreadedDecoder::scanned << " / " << _calls;
 		std::stringstream ssperf;
@@ -170,13 +171,12 @@ Java_org_cimbar_camerafilecopy_MainActivity_processImageJNI(JNIEnv *env, jobject
 	Mat &mat = *(Mat *) matAddr;
 	string dataPath = jstring_to_cppstr(env, dataPathObj);
 	int modeVal = (int)modeInt;
-	bool legacyMode = modeVal <= 8; // current scheme: old 4c = 4, old 8c = 8, new = bigger number
 
 	std::shared_ptr<MultiThreadedDecoder> proc;
 	{
 		std::lock_guard<std::mutex> lock(_mutex);
-		if (!_proc or _proc->legacy_mode() != legacyMode)
-			_proc = std::make_shared<MultiThreadedDecoder>(dataPath, legacyMode);
+		if (!_proc or !_proc->set_mode(modeVal))
+			_proc = std::make_shared<MultiThreadedDecoder>(dataPath, modeVal);
 		proc = _proc;
 	}
 
@@ -205,6 +205,9 @@ Java_org_cimbar_camerafilecopy_MainActivity_processImageJNI(JNIEnv *env, jobject
 
 	// return a decoded file to prompt the user to save it, if there is a new one
 	string result;
+	if (proc->detected_mode()) // repurpose str for special message passing
+		result = fmt::format("/{}", proc->detected_mode());
+
 	std::vector<string> all_decodes = proc->get_done();
 	for (string& s : all_decodes)
 		if (_completed.find(s) == _completed.end())

app/src/cpp/libcimbar/src/exe/cimbar/cimbar.cpp

@@ -119,7 +119,7 @@ int encode(const FilenameIterable& infiles, const std::string& outpath, int ecc,
 }
 
 template <typename FilenameIterable>
-int decode(const FilenameIterable& infiles, const std::function<int(cv::UMat, bool, int)>& decodefun, bool no_deskew, bool undistort, int preprocess, int color_correct)
+int decode(const FilenameIterable& infiles, const std::function<int(cv::UMat, unsigned, bool, int)>& decodefun, bool no_deskew, bool undistort, unsigned color_mode, int preprocess, int color_correct)
 {
 	int err = 0;
 	for (const string& inf : infiles)
@@ -152,7 +152,7 @@ int decode(const FilenameIterable& infiles, const std::function<int(cv::UMat, bo
 				shouldPreprocess = true;
 		}
 
-		int bytes = decodefun(img, shouldPreprocess, color_correct);
+		int bytes = decodefun(img, color_mode, shouldPreprocess, color_correct);
 		if (!bytes)
 			err |= 4;
 	}
@@ -162,10 +162,10 @@ int decode(const FilenameIterable& infiles, const std::function<int(cv::UMat, bo
 // see also "decodefun" for non-fountain decodes, defined as a lambda inline below.
 // this one needs its own function since it's a template (:
 template <typename SINK>
-std::function<int(cv::UMat,bool,int)> fountain_decode_fun(SINK& sink, Decoder& d)
+std::function<int(cv::UMat,unsigned,bool,int)> fountain_decode_fun(SINK& sink, Decoder& d)
 {
-	return [&sink, &d] (cv::UMat m, bool pre, int cc) {
-		return d.decode_fountain(m, sink, pre, cc);
+	return [&sink, &d] (cv::UMat m, unsigned cm, bool pre, int cc) {
+		return d.decode_fountain(m, sink, cm, pre, cc);
 	};
 }
 
@@ -247,8 +247,7 @@ int main(int argc, char** argv)
 	int preprocess = result["preprocess"].as<int>();
 
 	unsigned color_mode = legacy_mode? 0 : 1;
-	bool coupled = legacy_mode;
-	Decoder d(ecc, colorBits, color_mode, coupled);
+	Decoder d(ecc, colorBits);
 
 	if (no_fountain)
 	{
@@ -257,13 +256,13 @@ int main(int argc, char** argv)
 
 		// simpler encoding, just the basics + ECC. No compression, fountain codes, etc.
 		std::ofstream f(outpath);
-		std::function<int(cv::UMat,bool,int)> decodefun = [&f, &d] (cv::UMat m, bool pre, int cc) {
-			return d.decode(m, f, pre, cc);
+		std::function<int(cv::UMat,unsigned,bool,int)> decodefun = [&f, &d] (cv::UMat m, unsigned cm, bool pre, int cc) {
+			return d.decode(m, f, cm, pre, cc);
 		};
 		if (useStdin)
-			return decode(StdinLineReader(), decodefun, no_deskew, undistort, preprocess, color_correct);
+			return decode(StdinLineReader(), decodefun, no_deskew, undistort, color_mode, preprocess, color_correct);
 		else
-			return decode(infiles, decodefun, no_deskew, undistort, preprocess, color_correct);
+			return decode(infiles, decodefun, no_deskew, undistort, color_mode, preprocess, color_correct);
 	}
 
 	// else, the good stuff
@@ -273,16 +272,16 @@ int main(int argc, char** argv)
 	if (compressionLevel <= 0)
 	{
 		fountain_decoder_sink<std::ofstream> sink(outpath, chunkSize, true);
-		res = decode(infiles, fountain_decode_fun(sink, d), no_deskew, undistort, preprocess, color_correct);
+		res = decode(infiles, fountain_decode_fun(sink, d), no_deskew, undistort, color_mode, preprocess, color_correct);
 	}
 	else // default case, all bells and whistles
 	{
 		fountain_decoder_sink<cimbar::zstd_decompressor<std::ofstream>> sink(outpath, chunkSize, true);
 
 		if (useStdin)
-			res = decode(StdinLineReader(), fountain_decode_fun(sink, d), no_deskew, undistort, preprocess, color_correct);
+			res = decode(StdinLineReader(), fountain_decode_fun(sink, d), no_deskew, undistort, color_mode, preprocess, color_correct);
 		else
-			res = decode(infiles, fountain_decode_fun(sink, d), no_deskew, undistort, preprocess, color_correct);
+			res = decode(infiles, fountain_decode_fun(sink, d), no_deskew, undistort, color_mode, preprocess, color_correct);
 	}
 	if (not color_correction_file.empty())
 		d.save_ccm(color_correction_file);

app/src/cpp/libcimbar/src/exe/cimbar_recv/recv.cpp

@@ -70,6 +70,7 @@ int main(int argc, char** argv)
 		string mode = result["mode"].as<string>();
 		legacy_mode = (mode == "4c") or (mode == "4C");
 	}
+	unsigned color_mode = legacy_mode? 0 : 1;
 
 	unsigned fps = result["fps"].as<unsigned>();
 	if (fps == 0)
@@ -104,8 +105,7 @@ int main(int argc, char** argv)
 	window.auto_scale_to_window();
 
 	Extractor ext;
-	unsigned color_mode = legacy_mode? 0 : 1;
-	Decoder dec(-1, -1, color_mode, legacy_mode);
+	Decoder dec(-1, -1);
 
 	unsigned chunkSize = cimbar::Config::fountain_chunk_size(ecc, colorBits+cimbar::Config::symbol_bits(), legacy_mode);
 	fountain_decoder_sink<cimbar::zstd_decompressor<std::ofstream>> sink(outpath, chunkSize);
@@ -147,7 +147,7 @@ int main(int argc, char** argv)
 			shouldPreprocess = true;
 
 		// decode
-		int bytes = dec.decode_fountain(img, sink, shouldPreprocess);
+		int bytes = dec.decode_fountain(img, sink, color_mode, shouldPreprocess);
 		if (bytes > 0)
 			std::cerr << "got some bytes " << bytes << std::endl;
 	}

app/src/cpp/libcimbar/src/exe/cimbar_send/send.cpp

@@ -42,7 +42,7 @@ int main(int argc, char** argv)
 		("c,colorbits", "Color bits. [0-3]", cxxopts::value<int>()->default_value(turbo::str::str(colorBits)))
 		("e,ecc", "ECC level", cxxopts::value<unsigned>()->default_value(turbo::str::str(ecc)))
 		("f,fps", "Target FPS", cxxopts::value<unsigned>()->default_value(turbo::str::str(defaultFps)))
-		("m,mode", "Select a cimbar mode. B (the default) is new to 0.6.x. 4C is the 0.5.x config. [B,4C]", cxxopts::value<string>()->default_value("B"))
+		("m,mode", "Select a cimbar mode. B is new to 0.6.x. 4C is the 0.5.x config. [B,4C]", cxxopts::value<string>()->default_value("4C"))
 		("z,compression", "Compression level. 0 == no compression.", cxxopts::value<int>()->default_value(turbo::str::str(compressionLevel)))
 		("h,help", "Print usage")
 	;

app/src/cpp/libcimbar/src/lib/cimb_translator/CimbDecoder.cpp

@@ -54,11 +54,10 @@ namespace {
 	}
 }
 
-CimbDecoder::CimbDecoder(unsigned symbol_bits, unsigned color_bits, unsigned color_mode, bool dark, uchar ahashThreshold)
+CimbDecoder::CimbDecoder(unsigned symbol_bits, unsigned color_bits, bool dark, uchar ahashThreshold)
 	: _symbolBits(symbol_bits)
 	, _numSymbols(1 << symbol_bits)
 	, _numColors(1 << color_bits)
-	, _colorMode(color_mode)
 	, _dark(dark)
 	, _ahashThreshold(ahashThreshold)
 {
@@ -160,12 +159,12 @@ unsigned CimbDecoder::check_color_distance(std::tuple<uchar,uchar,uchar> a, std:
 	return color_diff(a, b);
 }
 
-std::tuple<uchar,uchar,uchar> CimbDecoder::get_color(int i) const
+std::tuple<uchar,uchar,uchar> CimbDecoder::get_color(int i, unsigned color_mode) const
 {
-	return cimbar::getColor(i, _numColors, _colorMode);
+	return cimbar::getColor(i, _numColors, color_mode);
 }
 
-unsigned CimbDecoder::get_best_color(float r, float g, float b) const
+unsigned CimbDecoder::get_best_color(float r, float g, float b, unsigned color_mode) const
 {
 	// transform color with ccm
 	if (internal_ccm().active())
@@ -188,7 +187,7 @@ unsigned CimbDecoder::get_best_color(float r, float g, float b) const
 	float best_distance = 1000000;
 	for (unsigned i = 0; i < _numColors; ++i)
 	{
-		std::tuple<uchar,uchar,uchar> candidate = get_color(i);
+		std::tuple<uchar,uchar,uchar> candidate = get_color(i, color_mode);
 		unsigned distance = check_color_distance(c, candidate);
 		if (distance < best_distance)
 		{
@@ -208,12 +207,12 @@ std::tuple<uchar,uchar,uchar> CimbDecoder::avg_color(const Cell& color_cell) con
 	return center.mean_rgb();
 }
 
-unsigned CimbDecoder::decode_color(const Cell& color_cell) const
+unsigned CimbDecoder::decode_color(const Cell& color_cell, unsigned color_mode) const
 {
 	if (_numColors <= 1)
 		return 0;
 	auto [r, g, b] = avg_color(color_cell);
-	return get_best_color(r, g, b);
+	return get_best_color(r, g, b, color_mode);
 }
 
 bool CimbDecoder::expects_binary_threshold() const

app/src/cpp/libcimbar/src/lib/cimb_translator/CimbDecoder.h

@@ -13,7 +13,7 @@
 class CimbDecoder
 {
 public:
-	CimbDecoder(unsigned symbol_bits, unsigned color_bits, unsigned color_mode=1, bool dark=true, uchar ahashThreshold=0);
+	CimbDecoder(unsigned symbol_bits, unsigned color_bits, bool dark=true, uchar ahashThreshold=0);
 
 	const color_correction& get_ccm() const;
 	void update_color_correction(cv::Matx<float, 3, 3>&& ccm);
@@ -22,10 +22,10 @@ class CimbDecoder
 	unsigned decode_symbol(const cv::Mat& cell, unsigned& drift_offset, unsigned& best_distance, unsigned cooldown=0xFF) const;
 	unsigned decode_symbol(const bitmatrix& cell, unsigned& drift_offset, unsigned& best_distance, unsigned cooldown=0xFF) const;
 
-	std::tuple<uchar,uchar,uchar> get_color(int i) const;
+	std::tuple<uchar,uchar,uchar> get_color(int i, unsigned color_mode) const;
 	std::tuple<uchar,uchar,uchar> avg_color(const Cell& color_cell) const;
-	unsigned get_best_color(float r, float g, float b) const;
-	unsigned decode_color(const Cell& cell) const;
+	unsigned get_best_color(float r, float g, float b, unsigned color_mode) const;
+	unsigned decode_color(const Cell& cell, unsigned color_mode) const;
 
 	bool expects_binary_threshold() const;
 	unsigned symbol_bits() const;
@@ -44,7 +44,6 @@ class CimbDecoder
 	unsigned _symbolBits;
 	unsigned _numSymbols;
 	unsigned _numColors;
-	unsigned _colorMode;
 	bool _dark;
 	uchar _ahashThreshold;
 };