godot/editor/import/resource_importer_wav.h

/*************************************************************************/
/*  resource_importer_wav.h                                              */
/*************************************************************************/
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
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#ifndef RESOURCEIMPORTWAV_H
#define RESOURCEIMPORTWAV_H

#include "core/io/resource_importer.h"

class ResourceImporterWAV : public ResourceImporter {
	GDCLASS(ResourceImporterWAV, ResourceImporter);

public:
	virtual String get_importer_name() const;
	virtual String get_visible_name() const;
	virtual void get_recognized_extensions(List<String> *p_extensions) const;
	virtual String get_save_extension() const;
	virtual String get_resource_type() const;

	virtual int get_preset_count() const;
	virtual String get_preset_name(int p_idx) const;

	virtual void get_import_options(List<ImportOption> *r_options, int p_preset = 0) const;
	virtual bool get_option_visibility(const String &p_option, const Map<StringName, Variant> &p_options) const;

	static void _compress_ima_adpcm(const Vector<float> &p_data, PoolVector<uint8_t> &dst_data) {
		/*p_sample_data->data = (void*)malloc(len);
		xm_s8 *dataptr=(xm_s8*)p_sample_data->data;*/

		static const int16_t _ima_adpcm_step_table[89] = {
			7, 8, 9, 10, 11, 12, 13, 14, 16, 17,
			19, 21, 23, 25, 28, 31, 34, 37, 41, 45,
			50, 55, 60, 66, 73, 80, 88, 97, 107, 118,
			130, 143, 157, 173, 190, 209, 230, 253, 279, 307,
			337, 371, 408, 449, 494, 544, 598, 658, 724, 796,
			876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066,
			2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358,
			5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,
			15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767
		};

		static const int8_t _ima_adpcm_index_table[16] = {
			-1, -1, -1, -1, 2, 4, 6, 8,
			-1, -1, -1, -1, 2, 4, 6, 8
		};

		int datalen = p_data.size();
		int datamax = datalen;
		if (datalen & 1) {
			datalen++;
		}

		dst_data.resize(datalen / 2 + 4);
		PoolVector<uint8_t>::Write w = dst_data.write();

		int i, step_idx = 0, prev = 0;
		uint8_t *out = w.ptr();
		//int16_t xm_prev=0;
		const float *in = p_data.ptr();

		/* initial value is zero */
		*(out++) = 0;
		*(out++) = 0;
		/* Table index initial value */
		*(out++) = 0;
		/* unused */
		*(out++) = 0;

		for (i = 0; i < datalen; i++) {
			int step, diff, vpdiff, mask;
			uint8_t nibble;
			int16_t xm_sample;

			if (i >= datamax) {
				xm_sample = 0;
			} else {
				xm_sample = CLAMP(in[i] * 32767.0, -32768, 32767);
				/*
				if (xm_sample==32767 || xm_sample==-32768)
					printf("clippy!\n",xm_sample);
				*/
			}

			//xm_sample=xm_sample+xm_prev;
			//xm_prev=xm_sample;

			diff = (int)xm_sample - prev;

			nibble = 0;
			step = _ima_adpcm_step_table[step_idx];
			vpdiff = step >> 3;
			if (diff < 0) {
				nibble = 8;
				diff = -diff;
			}
			mask = 4;
			while (mask) {
				if (diff >= step) {
					nibble |= mask;
					diff -= step;
					vpdiff += step;
				}

				step >>= 1;
				mask >>= 1;
			};

			if (nibble & 8) {
				prev -= vpdiff;
			} else {
				prev += vpdiff;
			}

			if (prev > 32767) {
				//printf("%i,xms %i, prev %i,diff %i, vpdiff %i, clip up %i\n",i,xm_sample,prev,diff,vpdiff,prev);
				prev = 32767;
			} else if (prev < -32768) {
				//printf("%i,xms %i, prev %i,diff %i, vpdiff %i, clip down %i\n",i,xm_sample,prev,diff,vpdiff,prev);
				prev = -32768;
			}

			step_idx += _ima_adpcm_index_table[nibble];
			if (step_idx < 0) {
				step_idx = 0;
			} else if (step_idx > 88) {
				step_idx = 88;
			}

			if (i & 1) {
				*out |= nibble << 4;
				out++;
			} else {
				*out = nibble;
			}
			/*dataptr[i]=prev>>8;*/
		}
	}

	virtual Error import(const String &p_source_file, const String &p_save_path, const Map<StringName, Variant> &p_options, List<String> *r_platform_variants, List<String> *r_gen_files = nullptr, Variant *r_metadata = nullptr);

	ResourceImporterWAV();
};

#endif // RESOURCEIMPORTWAV_H