mirror of
https://github.com/hajimehoshi/ebiten.git
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49 lines
1.6 KiB
Go
49 lines
1.6 KiB
Go
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// Copyright 2017 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build !js
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package mp3
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// #include "pdmp3.h"
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//
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// extern unsigned hsynth_init, synth_init;
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// extern t_mpeg1_main_data g_main_data;
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// extern t_mpeg1_side_info g_side_info;
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import "C"
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var store = [2][32][18]float32{}
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//export L3_Hybrid_Synthesis
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func L3_Hybrid_Synthesis(gr C.unsigned, ch C.unsigned) {
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for sb := 0; sb < 32; sb++ { /* Loop through all 32 subbands */
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/* Determine blocktype for this subband */
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bt := 0
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if (C.g_side_info.win_switch_flag[gr][ch] == 1) &&
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(C.g_side_info.mixed_block_flag[gr][ch] == 1) && (sb < 2) {
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bt = int(C.g_side_info.block_type[gr][ch])
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}
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/* Do the inverse modified DCT and windowing */
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in := make([]float32, 18)
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for i := range in {
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in[i] = float32(C.g_main_data.is[gr][ch][sb*18+i])
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}
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rawout := imdctWin(in, bt)
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for i := 0; i < 18; i++ { /* Overlapp add with stored vector into main_data vector */
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C.g_main_data.is[gr][ch][sb*18+i] = C.float(rawout[i] + store[ch][sb][i])
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store[ch][sb][i] = rawout[i+18]
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}
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}
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}
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