diff options
Diffstat (limited to 'tools/editor/plugins/sample_editor_plugin.cpp')
| -rw-r--r-- | tools/editor/plugins/sample_editor_plugin.cpp | 121 |
1 files changed, 120 insertions, 1 deletions
diff --git a/tools/editor/plugins/sample_editor_plugin.cpp b/tools/editor/plugins/sample_editor_plugin.cpp index 83adeee789..31fa7246ae 100644 --- a/tools/editor/plugins/sample_editor_plugin.cpp +++ b/tools/editor/plugins/sample_editor_plugin.cpp @@ -5,7 +5,7 @@ /* GODOT ENGINE */ /* http://www.godotengine.org */ /*************************************************************************/ -/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */ +/* Copyright (c) 2007-2015 Juan Linietsky, Ariel Manzur. */ /* */ /* Permission is hereby granted, free of charge, to any person obtaining */ /* a copy of this software and associated documentation files (the */ @@ -98,6 +98,125 @@ void SampleEditor::generate_preview_texture(const Ref<Sample>& p_sample,Ref<Imag if (p_sample->get_format()==Sample::FORMAT_IMA_ADPCM) { + struct IMA_ADPCM_State { + + int16_t step_index; + int32_t predictor; + /* values at loop point */ + int16_t loop_step_index; + int32_t loop_predictor; + int32_t last_nibble; + int32_t loop_pos; + int32_t window_ofs; + const uint8_t *ptr; + } ima_adpcm; + + ima_adpcm.step_index=0; + ima_adpcm.predictor=0; + ima_adpcm.loop_step_index=0; + ima_adpcm.loop_predictor=0; + ima_adpcm.last_nibble=-1; + ima_adpcm.loop_pos=0x7FFFFFFF; + ima_adpcm.window_ofs=0; + ima_adpcm.ptr=NULL; + + + for(int i=0;i<w;i++) { + + float max[2]={-1e10,-1e10}; + float min[2]={1e10,1e10}; + int from = i*len/w; + int to = (i+1)*len/w; + if (to>=len) + to=len-1; + + for(int j=from;j<to;j++) { + + while(j>ima_adpcm.last_nibble) { + + 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 + }; + + int16_t nibble,signed_nibble,diff,step; + + ima_adpcm.last_nibble++; + const uint8_t *src_ptr=sdata; + + nibble = (ima_adpcm.last_nibble&1)? + (src_ptr[ima_adpcm.last_nibble>>1]>>4):(src_ptr[ima_adpcm.last_nibble>>1]&0xF); + step=_ima_adpcm_step_table[ima_adpcm.step_index]; + + ima_adpcm.step_index += _ima_adpcm_index_table[nibble]; + if (ima_adpcm.step_index<0) + ima_adpcm.step_index=0; + if (ima_adpcm.step_index>88) + ima_adpcm.step_index=88; + + /* + signed_nibble = (nibble&7) * ((nibble&8)?-1:1); + diff = (2 * signed_nibble + 1) * step / 4; */ + + diff = step >> 3 ; + if (nibble & 1) + diff += step >> 2 ; + if (nibble & 2) + diff += step >> 1 ; + if (nibble & 4) + diff += step ; + if (nibble & 8) + diff = -diff ; + + ima_adpcm.predictor+=diff; + if (ima_adpcm.predictor<-0x8000) + ima_adpcm.predictor=-0x8000; + else if (ima_adpcm.predictor>0x7FFF) + ima_adpcm.predictor=0x7FFF; + + + /* store loop if there */ + if (ima_adpcm.last_nibble==ima_adpcm.loop_pos) { + + ima_adpcm.loop_step_index = ima_adpcm.step_index; + ima_adpcm.loop_predictor = ima_adpcm.predictor; + } + + } + + float v=ima_adpcm.predictor/32767.0; + if (v>max[0]) + max[0]=v; + if (v<min[0]) + min[0]=v; + } + + for(int j=0;j<h;j++) { + float v = (j/(float)h) * 2.0 - 1.0; + uint8_t* imgofs = &imgw[(j*w+i)*3]; + if (v>min[0] && v<max[0]) { + imgofs[0]=255; + imgofs[1]=150; + imgofs[2]=80; + } else { + imgofs[0]=0; + imgofs[1]=0; + imgofs[2]=0; + } + } + } } else { for(int i=0;i<w;i++) { // i trust gcc will optimize this loop |