mayhem-firmware/firmware/application/audio_thread.hpp

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/*
* Copyright (C) 2016 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __AUDIO_THREAD_H__
#define __AUDIO_THREAD_H__
#include "ch.h"
#include "file.hpp"
#include "event_m0.hpp"
#include "portapack_shared_memory.hpp"
#include "hackrf_gpio.hpp"
using namespace hackrf::one;
#include <cstring>
class StreamOutput {
public:
StreamOutput(
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FIFO<uint8_t>* const fifo
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) : fifo { fifo }
{
}
size_t available() {
return fifo->len();
}
size_t read(void* const data, const size_t length) {
return fifo->out(reinterpret_cast<uint8_t*>(data), length);
}
private:
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FIFO<uint8_t>* const fifo;
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};
class AudioThread {
public:
AudioThread(
std::string file_path
) : write_buffer { std::make_unique<std::array<uint8_t, write_size>>() }
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{
if( !file.open_for_append(file_path) ) {
return;
}
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// Need significant stack for FATFS
thread = chThdCreateFromHeap(NULL, 1024, NORMALPRIO + 10, AudioThread::static_fn, this);
}
~AudioThread() {
chThdTerminate(thread);
chEvtSignal(thread, EVT_FIFO_HIGHWATER);
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const auto success = chThdWait(thread);
if( !success ) {
led_tx.on();
}
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}
static void check_fifo_isr() {
if( (shared_memory.FIFO_HACK != nullptr) && (thread != nullptr) ) {
auto fifo = reinterpret_cast<FIFO<uint8_t>*>(shared_memory.FIFO_HACK);
if( fifo->len() >= write_size ) {
chEvtSignalI(thread, EVT_FIFO_HIGHWATER);
}
}
}
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private:
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static constexpr size_t write_size = 4096;
static constexpr eventmask_t EVT_FIFO_HIGHWATER = 1;
std::unique_ptr<std::array<uint8_t, write_size>> write_buffer;
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File file;
static Thread* thread;
static msg_t static_fn(void* arg) {
auto obj = static_cast<AudioThread*>(arg);
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return obj->run();
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}
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msg_t run() {
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auto fifo = reinterpret_cast<FIFO<uint8_t>*>(shared_memory.FIFO_HACK);
if( !fifo ) {
return false;
}
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StreamOutput stream { fifo };
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while( !chThdShouldTerminate() ) {
chEvtWaitAny(EVT_FIFO_HIGHWATER);
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while( stream.available() >= write_buffer->size() ) {
if( !transfer(stream, write_buffer.get()) ) {
return false;
}
}
}
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return true;
}
bool transfer(StreamOutput& stream, std::array<uint8_t, write_size>* const write_buffer) {
bool success = false;
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led_usb.on();
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const auto bytes_to_write = stream.read(write_buffer->data(), write_buffer->size());
if( bytes_to_write == write_buffer->size() ) {
if( file.write(write_buffer->data(), write_buffer->size()) ) {
success = true;
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}
}
led_usb.off();
return success;
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}
};
#endif/*__AUDIO_THREAD_H__*/