diff options
Diffstat (limited to 'editor/import/resource_importer_wav.h')
| -rw-r--r-- | editor/import/resource_importer_wav.h | 113 |
1 files changed, 112 insertions, 1 deletions
diff --git a/editor/import/resource_importer_wav.h b/editor/import/resource_importer_wav.h index cfce5a31ee..f78ab09e9b 100644 --- a/editor/import/resource_importer_wav.h +++ b/editor/import/resource_importer_wav.h @@ -48,7 +48,118 @@ public: 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; - void _compress_ima_adpcm(const Vector<float> &p_data, PoolVector<uint8_t> &dst_data); + 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 = NULL); |