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48 lines
1.6 KiB
48 lines
1.6 KiB
7 years ago
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/*
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* Copyright 2012 Google Inc.
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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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*/
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#ifndef __FM_OP_KERNEL_H
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#define __FM_OP_KERNEL_H
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struct FmOpParams {
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int32_t level_in; // value to be computed (from level to gain[0])
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int32_t gain_out; // computed value (gain[1] to gain[0])
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int32_t freq;
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int32_t phase;
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};
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class FmOpKernel {
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public:
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// gain1 and gain2 represent linear step: gain for sample i is
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// gain1 + (1 + i) / 64 * (gain2 - gain1)
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// This is the basic FM operator. No feedback.
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static void compute(int32_t *output, const int32_t *input,
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int32_t phase0, int32_t freq,
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int32_t gain1, int32_t gain2, bool add);
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// This is a sine generator, no feedback.
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static void compute_pure(int32_t *output, int32_t phase0, int32_t freq,
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int32_t gain1, int32_t gain2, bool add);
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// One op with feedback, no add.
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static void compute_fb(int32_t *output, int32_t phase0, int32_t freq,
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int32_t gain1, int32_t gain2,
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int32_t *fb_buf, int fb_gain, bool add);
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};
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#endif
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