120 lines
3.3 KiB
C++
120 lines
3.3 KiB
C++
/*
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AudioFileSourceFunction
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Audio ouptut generator which can generate WAV file data from function
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Copyright (C) 2021 Hideaki Tai
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _AUDIOFILESOURCEFUNCTION_H
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#define _AUDIOFILESOURCEFUNCTION_H
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#include <Arduino.h>
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#include <vector>
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#include <functional>
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#include "AudioFileSource.h"
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class AudioFileSourceFunction : public AudioFileSource {
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union WavHeader {
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struct {
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// RIFF chunk
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struct {
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char chunk_id[4]; // "RIFF"
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uint32_t chunk_size; // 4 + (8 + sizeof(format_chunk)(16)) + (8 + sizeof(data_chunk))
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char format[4]; // "WAVE"
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} riff;
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// format chunk
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struct {
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char chunk_id[4]; // "fmt "
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uint32_t chunk_size; // 16
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uint16_t format_tag; // 1: PCM
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uint16_t channels; // 1: MONO, 2: STEREO
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uint32_t sample_per_sec; // 8000, 11025, 22050, 44100, 48000
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uint32_t avg_bytes_per_sec; // sample_per_sec * channels * bits_per_sample / 8
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uint16_t block_align; // channels * bits_per_sample / 8
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uint16_t bits_per_sample; // 8, 16, 32
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} format;
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// data chunk
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struct {
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char chunk_id[4]; // "data"
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uint32_t chunk_size; // num_samples * channels * bytes_per_sample
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// audio data follows here...
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} data;
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};
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uint8_t bytes[44];
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} wav_header;
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union Uint8AndInt8 {
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int8_t i;
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uint8_t u;
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};
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union Uint8AndInt16 {
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int16_t i;
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uint8_t u[2];
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};
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union Uint8AndInt32 {
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int32_t i;
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uint8_t u[4];
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};
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using callback_t = std::function<float(float)>;
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std::vector<callback_t> funcs;
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uint32_t pos;
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uint32_t size;
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bool is_ready;
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bool is_unique;
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public:
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AudioFileSourceFunction(float sec, uint16_t channels = 1, uint32_t sample_per_sec = 8000, uint16_t bits_per_sample = 16);
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virtual ~AudioFileSourceFunction() override;
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template <typename F, typename... Fs>
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bool addAudioGenerators(const F& f, Fs&&... fs) {
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funcs.emplace_back(f);
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return addAudioGenerators(std::forward<Fs>(fs)...);
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}
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bool addAudioGenerators() {
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funcs.shrink_to_fit();
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if (funcs.size() == 1) {
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is_ready = true;
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is_unique = true;
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return true;
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} else if (funcs.size() == wav_header.format.channels) {
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is_ready = true;
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is_unique = false;
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return true;
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} else {
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is_ready = false;
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is_unique = false;
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funcs.clear();
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return false;
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}
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}
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virtual uint32_t read(void* data, uint32_t len) override;
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virtual bool seek(int32_t pos, int dir) override;
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virtual bool close() override;
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virtual bool isOpen() override;
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virtual uint32_t getSize() override;
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virtual uint32_t getPos() override;
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};
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#endif // _AUDIOFILESOURCEFUNCTION_H
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