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audioutils/fmsynth: Add FM synthesizer library
Add simple FM synthesizer library in audioutils. (cherry picked from commit 40c506f)
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| # | ||
| # For a description of the syntax of this configuration file, | ||
| # see the file kconfig-language.txt in the NuttX tools repository. | ||
| # | ||
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| config AUDIOUTILS_FMSYNTH_LIB | ||
| bool "FM Synthesizer Library" | ||
| default n | ||
| ---help--- | ||
| Enable support for the FM Synthesizer library. |
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| ############################################################################ | ||
| # apps/audioutils/fmsynth/Make.defs | ||
| # | ||
| # Licensed to the Apache Software Foundation (ASF) under one or more | ||
| # contributor license agreements. See the NOTICE file distributed with | ||
| # this work for additional information regarding copyright ownership. The | ||
| # ASF licenses this file to you under the Apache License, Version 2.0 (the | ||
| # "License"); you may not use this file except in compliance with the | ||
| # License. You may obtain a copy of the License at | ||
| # | ||
| # http://www.apache.org/licenses/LICENSE-2.0 | ||
| # | ||
| # Unless required by applicable law or agreed to in writing, software | ||
| # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | ||
| # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the | ||
| # License for the specific language governing permissions and limitations | ||
| # under the License. | ||
| # | ||
| ############################################################################ | ||
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| ifeq ($(CONFIG_AUDIOUTILS_FMSYNTH_LIB),y) | ||
| CONFIGURED_APPS += $(APPDIR)/audioutils/fmsynth | ||
| endif |
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| ############################################################################ | ||
| # apps/audioutils/fmsynth/Makefile | ||
| # | ||
| # Licensed to the Apache Software Foundation (ASF) under one or more | ||
| # contributor license agreements. See the NOTICE file distributed with | ||
| # this work for additional information regarding copyright ownership. The | ||
| # ASF licenses this file to you under the Apache License, Version 2.0 (the | ||
| # "License"); you may not use this file except in compliance with the | ||
| # License. You may obtain a copy of the License at | ||
| # | ||
| # http://www.apache.org/licenses/LICENSE-2.0 | ||
| # | ||
| # Unless required by applicable law or agreed to in writing, software | ||
| # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | ||
| # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the | ||
| # License for the specific language governing permissions and limitations | ||
| # under the License. | ||
| # | ||
| ############################################################################ | ||
|
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| include $(APPDIR)/Make.defs | ||
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| CSRCS = fmsynth.c fmsynth_eg.c fmsynth_op.c | ||
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| include $(APPDIR)/Application.mk |
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| /**************************************************************************** | ||
| * apps/audioutils/fmsynth/fmsynth.c | ||
| * | ||
| * Licensed to the Apache Software Foundation (ASF) under one or more | ||
| * contributor license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright ownership. The | ||
| * ASF licenses this file to you under the Apache License, Version 2.0 (the | ||
| * "License"); you may not use this file except in compliance with the | ||
| * License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | ||
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the | ||
| * License for the specific language governing permissions and limitations | ||
| * under the License. | ||
| * | ||
| ****************************************************************************/ | ||
|
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| /**************************************************************************** | ||
| * Included Files | ||
| ****************************************************************************/ | ||
|
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| #include <stdlib.h> | ||
| #include <audioutils/fmsynth.h> | ||
|
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| /**************************************************************************** | ||
| * Pre-processor Definitions | ||
| ****************************************************************************/ | ||
|
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| #define WRAP_ROUND_TIME_SEC (10) | ||
|
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| /**************************************************************************** | ||
| * Private Data | ||
| ****************************************************************************/ | ||
|
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| static int max_phase_time; | ||
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| /**************************************************************************** | ||
| * Private Functions | ||
| ****************************************************************************/ | ||
|
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| /**************************************************************************** | ||
| * name: fetch_feedback | ||
| ****************************************************************************/ | ||
|
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| static void fetch_feedback(FAR fmsynth_op_t *ops) | ||
| { | ||
| while (ops != NULL) | ||
| { | ||
| fmsynthop_update_feedback(ops); | ||
| ops = ops->parallelop; | ||
| } | ||
| } | ||
|
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| /**************************************************************************** | ||
| * name: update_phase | ||
| ****************************************************************************/ | ||
|
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| static void update_phase(FAR fmsynth_sound_t *snd) | ||
| { | ||
| snd->phase_time++; | ||
| if (snd->phase_time >= max_phase_time) | ||
| { | ||
| snd->phase_time = 0; | ||
| } | ||
| } | ||
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| /**************************************************************************** | ||
| * name: sound_modulate | ||
| ****************************************************************************/ | ||
|
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| static int sound_modulate(FAR fmsynth_sound_t *snd) | ||
| { | ||
| int out = 0; | ||
| FAR fmsynth_op_t *op; | ||
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| if (snd->operators == NULL) | ||
| { | ||
| return out; | ||
| } | ||
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| fetch_feedback(snd->operators); | ||
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| for (op = snd->operators; op != NULL; op = op->parallelop) | ||
| { | ||
| out += fmsynthop_operate(op, snd->phase_time); | ||
| } | ||
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| update_phase(snd); | ||
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| return out * snd->volume / FMSYNTH_MAX_VOLUME; | ||
| } | ||
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| /**************************************************************************** | ||
| * Public Functions | ||
| ****************************************************************************/ | ||
|
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| /**************************************************************************** | ||
| * name: fmsynth_initialize | ||
| ****************************************************************************/ | ||
|
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| int fmsynth_initialize(int fs) | ||
| { | ||
| max_phase_time = fs * WRAP_ROUND_TIME_SEC; | ||
| return fmsynthop_set_samplerate(fs); | ||
| } | ||
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| /**************************************************************************** | ||
| * name: fmsynthsnd_create | ||
| ****************************************************************************/ | ||
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| FAR fmsynth_sound_t *fmsynthsnd_create(void) | ||
| { | ||
| FAR fmsynth_sound_t *ret; | ||
| ret = (FAR fmsynth_sound_t *)malloc(sizeof(fmsynth_sound_t)); | ||
| if (ret) | ||
| { | ||
| ret->phase_time = 0; | ||
| ret->volume = FMSYNTH_MAX_VOLUME; | ||
| ret->operators = NULL; | ||
| ret->next_sound = NULL; | ||
| } | ||
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| return ret; | ||
| } | ||
|
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| /**************************************************************************** | ||
| * name: fmsynthsnd_delete | ||
| ****************************************************************************/ | ||
|
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| void fmsynthsnd_delete(FAR fmsynth_sound_t *snd) | ||
| { | ||
| if (snd != NULL) | ||
| { | ||
| free(snd); | ||
| } | ||
| } | ||
|
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| /**************************************************************************** | ||
| * name: fmsynthsnd_set_operator | ||
| ****************************************************************************/ | ||
|
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| int fmsynthsnd_set_operator(FAR fmsynth_sound_t *snd, FAR fmsynth_op_t *op) | ||
| { | ||
| snd->operators = op; | ||
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| return OK; | ||
| } | ||
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| /**************************************************************************** | ||
| * name: fmsynthsnd_set_soundfreq | ||
| ****************************************************************************/ | ||
|
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| void fmsynthsnd_set_soundfreq(FAR fmsynth_sound_t *snd, float freq) | ||
| { | ||
| FAR fmsynth_op_t *op; | ||
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| for (op = snd->operators; op != NULL; op = op->parallelop) | ||
| { | ||
| fmsynthop_set_soundfreq(op, freq); | ||
| fmsynthop_start(op); | ||
| } | ||
| } | ||
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| /**************************************************************************** | ||
| * name: fmsynthsnd_set_volume | ||
| ****************************************************************************/ | ||
|
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| void fmsynthsnd_set_volume(FAR fmsynth_sound_t *snd, float vol) | ||
| { | ||
| snd->volume = vol * FMSYNTH_MAX_VOLUME; | ||
| } | ||
|
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| /**************************************************************************** | ||
| * name: fmsynthsnd_add_subsound | ||
| ****************************************************************************/ | ||
|
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| int fmsynthsnd_add_subsound(FAR fmsynth_sound_t *top, | ||
| FAR fmsynth_sound_t *sub) | ||
| { | ||
| FAR fmsynth_sound_t *s = top; | ||
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| if (!top || !sub) | ||
| { | ||
| return ERROR; | ||
| } | ||
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| for (s = top; s->next_sound; s = s->next_sound); | ||
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| s->next_sound = sub; | ||
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| return OK; | ||
| } | ||
|
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| /**************************************************************************** | ||
| * name: fmsynth_rendering | ||
| ****************************************************************************/ | ||
|
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| int fmsynth_rendering(FAR fmsynth_sound_t *snd, | ||
| FAR int16_t *sample, int sample_num, int chnum, | ||
| fmsynth_tickcb_t cb, unsigned long cbarg) | ||
| { | ||
| int i; | ||
| int ch; | ||
| int out; | ||
| FAR fmsynth_sound_t *itr; | ||
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| for (i = 0; i < sample_num; i += chnum) | ||
| { | ||
| out = 0; | ||
| for (itr = snd; itr != NULL; itr = itr->next_sound) | ||
| { | ||
| out = out + sound_modulate(itr); | ||
| } | ||
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| for (ch = 0; ch < chnum; ch++) | ||
| { | ||
| *sample++ = (int16_t)out; | ||
| } | ||
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| if (cb != NULL) | ||
| { | ||
| cb(cbarg); | ||
| } | ||
| } | ||
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| if (i > sample_num) | ||
| { | ||
| i -= chnum; | ||
| } | ||
|
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| /* Return total bytes stored in the buffer */ | ||
|
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| return i * sizeof(int16_t); | ||
| } |
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