mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-20 23:17:42 +00:00
77 lines
2.4 KiB
C++
77 lines
2.4 KiB
C++
/*
|
|
* 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.
|
|
*/
|
|
|
|
#include "stream_input.hpp"
|
|
|
|
#include "lpc43xx_cpp.hpp"
|
|
using namespace lpc43xx;
|
|
|
|
StreamInput::StreamInput(CaptureConfig* const config) :
|
|
fifo_buffers_empty { buffers_empty.data(), buffer_count_max_log2 },
|
|
fifo_buffers_full { buffers_full.data(), buffer_count_max_log2 },
|
|
config { config },
|
|
data { std::make_unique<uint8_t[]>(config->write_size * config->buffer_count) }
|
|
{
|
|
config->fifo_buffers_empty = &fifo_buffers_empty;
|
|
config->fifo_buffers_full = &fifo_buffers_full;
|
|
|
|
for(size_t i=0; i<config->buffer_count; i++) {
|
|
buffers[i] = { &(data.get()[i * config->write_size]), config->write_size };
|
|
fifo_buffers_empty.in(&buffers[i]);
|
|
}
|
|
}
|
|
|
|
size_t StreamInput::write(const void* const data, const size_t length) {
|
|
const uint8_t* p = static_cast<const uint8_t*>(data);
|
|
size_t written = 0;
|
|
|
|
while( written < length ) {
|
|
if( !active_buffer ) {
|
|
// We need an empty buffer...
|
|
if( !fifo_buffers_empty.out(active_buffer) ) {
|
|
// ...but none are available. Samples were dropped.
|
|
break;
|
|
}
|
|
}
|
|
|
|
const auto remaining = length - written;
|
|
written += active_buffer->write(&p[written], remaining);
|
|
|
|
if( active_buffer->is_full() ) {
|
|
if( !fifo_buffers_full.in(active_buffer) ) {
|
|
// FIFO is full of buffers, there's no place for this one.
|
|
// Bail out of the loop, and try submitting the buffer in the
|
|
// next pass.
|
|
// This should never happen if the number of buffers is less
|
|
// than the capacity of the FIFO.
|
|
break;
|
|
}
|
|
active_buffer = nullptr;
|
|
creg::m4txevent::assert_event();
|
|
}
|
|
}
|
|
|
|
config->baseband_bytes_received += length;
|
|
config->baseband_bytes_dropped += (length - written);
|
|
|
|
return written;
|
|
}
|