--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/foosdk/sdk/foobar2000/SDK/audio_chunk_channel_config.cpp	Mon Jan 05 02:15:46 2026 -0500
@@ -0,0 +1,233 @@
+#include "foobar2000-sdk-pch.h"
+#include "audio_chunk.h"
+
+#ifdef _WIN32
+#include <ks.h>
+#include <ksmedia.h>
+
+#if 0
+#define SPEAKER_FRONT_LEFT             0x1
+#define SPEAKER_FRONT_RIGHT            0x2
+#define SPEAKER_FRONT_CENTER           0x4
+#define SPEAKER_LOW_FREQUENCY          0x8
+#define SPEAKER_BACK_LEFT              0x10
+#define SPEAKER_BACK_RIGHT             0x20
+#define SPEAKER_FRONT_LEFT_OF_CENTER   0x40
+#define SPEAKER_FRONT_RIGHT_OF_CENTER  0x80
+#define SPEAKER_BACK_CENTER            0x100
+#define SPEAKER_SIDE_LEFT              0x200
+#define SPEAKER_SIDE_RIGHT             0x400
+#define SPEAKER_TOP_CENTER             0x800
+#define SPEAKER_TOP_FRONT_LEFT         0x1000
+#define SPEAKER_TOP_FRONT_CENTER       0x2000
+#define SPEAKER_TOP_FRONT_RIGHT        0x4000
+#define SPEAKER_TOP_BACK_LEFT          0x8000
+#define SPEAKER_TOP_BACK_CENTER        0x10000
+#define SPEAKER_TOP_BACK_RIGHT         0x20000
+
+static struct {DWORD m_wfx; unsigned m_native; } const g_translation_table[] =
+{
+	{SPEAKER_FRONT_LEFT,			audio_chunk::channel_front_left},
+	{SPEAKER_FRONT_RIGHT,			audio_chunk::channel_front_right},
+	{SPEAKER_FRONT_CENTER,			audio_chunk::channel_front_center},
+	{SPEAKER_LOW_FREQUENCY,			audio_chunk::channel_lfe},
+	{SPEAKER_BACK_LEFT,				audio_chunk::channel_back_left},
+	{SPEAKER_BACK_RIGHT,			audio_chunk::channel_back_right},
+	{SPEAKER_FRONT_LEFT_OF_CENTER,	audio_chunk::channel_front_center_left},
+	{SPEAKER_FRONT_RIGHT_OF_CENTER,	audio_chunk::channel_front_center_right},
+	{SPEAKER_BACK_CENTER,			audio_chunk::channel_back_center},
+	{SPEAKER_SIDE_LEFT,				audio_chunk::channel_side_left},
+	{SPEAKER_SIDE_RIGHT,			audio_chunk::channel_side_right},
+	{SPEAKER_TOP_CENTER,			audio_chunk::channel_top_center},
+	{SPEAKER_TOP_FRONT_LEFT,		audio_chunk::channel_top_front_left},
+	{SPEAKER_TOP_FRONT_CENTER,		audio_chunk::channel_top_front_center},
+	{SPEAKER_TOP_FRONT_RIGHT,		audio_chunk::channel_top_front_right},
+	{SPEAKER_TOP_BACK_LEFT,			audio_chunk::channel_top_back_left},
+	{SPEAKER_TOP_BACK_CENTER,		audio_chunk::channel_top_back_center},
+	{SPEAKER_TOP_BACK_RIGHT,		audio_chunk::channel_top_back_right},
+};
+
+#endif
+#endif
+
+
+
+static constexpr unsigned g_audio_channel_config_table[] = 
+{
+	0,
+	audio_chunk::channel_config_mono,
+	audio_chunk::channel_config_stereo,
+	audio_chunk::channel_front_left | audio_chunk::channel_front_right | audio_chunk::channel_lfe,
+	audio_chunk::channel_front_left | audio_chunk::channel_front_right | audio_chunk::channel_back_left | audio_chunk::channel_back_right,
+	audio_chunk::channel_front_left | audio_chunk::channel_front_right | audio_chunk::channel_back_left | audio_chunk::channel_back_right | audio_chunk::channel_lfe,
+	audio_chunk::channel_config_5point1,
+	audio_chunk::channel_config_5point1_side | audio_chunk::channel_back_center,
+	audio_chunk::channel_config_7point1,
+	0,
+	audio_chunk::channel_config_7point1 | audio_chunk::channel_front_center_right | audio_chunk::channel_front_center_left,
+};
+
+unsigned audio_chunk::g_guess_channel_config(unsigned count)
+{
+	if (count == 0) return 0;
+	if (count > 32) throw exception_io_data();
+	unsigned ret = 0;
+	if (count < PFC_TABSIZE(g_audio_channel_config_table)) ret = g_audio_channel_config_table[count];
+	if (ret == 0) {
+		// Warning: 1u<<32u behaves stupidly
+		ret = (unsigned)( (1ull << count) - 1 );
+	}
+	PFC_ASSERT(g_count_channels(ret) == count);
+	return ret;	
+}
+
+unsigned audio_chunk::g_guess_channel_config_xiph(unsigned count) {
+	switch (count) {
+	case 3:
+		return audio_chunk::channel_front_left | audio_chunk::channel_front_center | audio_chunk::channel_front_right;
+	case 5:
+		return audio_chunk::channel_front_left | audio_chunk::channel_front_center | audio_chunk::channel_front_right | audio_chunk::channel_back_left | audio_chunk::channel_back_right;
+	case 7:
+		return audio_chunk::channel_config_5point1 | audio_chunk::channel_back_center;
+	default:
+		return g_guess_channel_config(count);
+	}	
+}
+
+unsigned audio_chunk::g_channel_index_from_flag(unsigned p_config,unsigned p_flag) {
+	if (p_config & p_flag) {
+		unsigned index = 0;
+
+		for (unsigned walk = 0; walk < 32; walk++) {
+			unsigned query = 1 << walk;
+			if (p_flag & query) return index;
+			if (p_config & query) index++;
+		}
+	}
+	return (unsigned)(-1);
+}
+
+unsigned audio_chunk::g_extract_channel_flag(unsigned p_config,unsigned p_index)
+{
+	unsigned toskip = p_index;
+	unsigned flag = 1;
+	while(flag)
+	{
+		if (p_config & flag)
+		{
+			if (toskip == 0) break;
+			toskip--;
+		}
+		flag <<= 1;
+	}
+	return flag;
+}
+
+
+static const char * const chanNames[] = {
+	"FL", //channel_front_left			= 1<<0,
+	"FR", //channel_front_right			= 1<<1,
+	"FC", //channel_front_center		= 1<<2,
+	"LFE", //channel_lfe					= 1<<3,
+	"BL", //channel_back_left			= 1<<4,
+	"BR", //channel_back_right			= 1<<5,
+	"FCL", //channel_front_center_left	= 1<<6,
+	"FCR", //channel_front_center_right	= 1<<7,
+	"BC", //channel_back_center			= 1<<8,
+	"SL", //channel_side_left			= 1<<9,
+	"SR", //channel_side_right			= 1<<10,
+	"TC", //channel_top_center			= 1<<11,
+	"TFL", //channel_top_front_left		= 1<<12,
+	"TFC", //channel_top_front_center	= 1<<13,
+	"TFR", //channel_top_front_right		= 1<<14,
+	"TBL", //channel_top_back_left		= 1<<15,
+	"TBC", //channel_top_back_center		= 1<<16,
+	"TBR", //channel_top_back_right		= 1<<17,
+};
+
+unsigned audio_chunk::g_find_channel_idx(unsigned p_flag) {
+	unsigned rv = 0;
+	if ((p_flag & 0xFFFF) == 0) {
+		rv += 16; p_flag >>= 16;
+	}
+	if ((p_flag & 0xFF) == 0) {
+		rv += 8; p_flag >>= 8;
+	}
+	if ((p_flag & 0xF) == 0) {
+		rv += 4; p_flag >>= 4;
+	}
+	if ((p_flag & 0x3) == 0) {
+		rv += 2; p_flag >>= 2;
+	}
+	if ((p_flag & 0x1) == 0) {
+		rv += 1; p_flag >>= 1;
+	}
+	PFC_ASSERT( p_flag & 1 );
+	return rv;
+}
+
+const char * audio_chunk::g_channel_name(unsigned p_flag) {
+	return g_channel_name_byidx(g_find_channel_idx(p_flag));
+}
+
+const char * audio_chunk::g_channel_name_byidx(unsigned p_index) {
+	if (p_index < PFC_TABSIZE(chanNames)) return chanNames[p_index];
+	else return "?";
+}
+
+pfc::string8 audio_chunk::g_formatChannelMaskDesc(unsigned flags) {
+	pfc::string8 temp; g_formatChannelMaskDesc(flags, temp); return temp;
+}
+void audio_chunk::g_formatChannelMaskDesc(unsigned flags, pfc::string_base & out) {
+	out.reset();
+	unsigned idx = 0;
+	while(flags) {
+		if (flags & 1) {
+			if (!out.is_empty()) out << " ";
+			out << g_channel_name_byidx(idx);
+		}
+		flags >>= 1;
+		++idx;
+	}
+}
+
+namespace {
+	struct maskDesc_t {
+		const char* name;
+		unsigned mask;
+	};
+	static constexpr maskDesc_t maskDesc[] = {
+		{"mono", audio_chunk::channel_config_mono},
+		{"stereo", audio_chunk::channel_config_stereo},
+		{"stereo (rear)", audio_chunk::channel_back_left | audio_chunk::channel_back_right},
+		{"stereo (side)", audio_chunk::channel_side_left | audio_chunk::channel_side_right},
+		{"2.1", audio_chunk::channel_config_2point1},
+		{"3.0", audio_chunk::channel_config_3point0},
+		{"4.0", audio_chunk::channel_config_4point0},
+		{"4.1", audio_chunk::channel_config_4point1},
+		{"5.0", audio_chunk::channel_config_5point0},
+		{"5.1", audio_chunk::channel_config_5point1},
+		{"5.1 (side)", audio_chunk::channel_config_5point1_side},
+		{"6.1", audio_chunk::channel_config_5point1 | audio_chunk::channel_back_center},
+		{"6.1 (side)", audio_chunk::channel_config_5point1_side | audio_chunk::channel_back_center},
+		{"7.1", audio_chunk::channel_config_7point1},
+	};
+}
+
+const char* audio_chunk::g_channelMaskName(unsigned flags) {
+	for (auto& walk : maskDesc) {
+		if (flags == walk.mask) return walk.name;
+	}
+	return nullptr;
+}
+
+static_assert( pfc::countBits32(audio_chunk::channel_config_mono) == 1 );
+static_assert( pfc::countBits32(audio_chunk::channel_config_stereo) == 2 );
+static_assert( pfc::countBits32(audio_chunk::channel_config_4point0) == 4 );
+static_assert( pfc::countBits32(audio_chunk::channel_config_4point0_side) == 4 );
+static_assert( pfc::countBits32(audio_chunk::channel_config_4point1) == 5 );
+static_assert( pfc::countBits32(audio_chunk::channel_config_5point0) == 5 );
+static_assert( pfc::countBits32(audio_chunk::channel_config_5point1) == 6 );
+static_assert( pfc::countBits32(audio_chunk::channel_config_5point1_side) == 6 );
+static_assert( pfc::countBits32(audio_chunk::channel_config_6point0) == 6);
+static_assert( pfc::countBits32(audio_chunk::channel_config_7point1) == 8 );