78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
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/*
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* Copyright (C) 2016 Jared Boone, ShareBrained Technology, Inc.
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* Copyright (C) 2016 Furrtek
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*
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* This file is part of PortaPack.
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*
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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 2, or (at your option)
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* any later version.
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*
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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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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#include "stream_output.hpp"
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#include "lpc43xx_cpp.hpp"
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using namespace lpc43xx;
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StreamOutput::StreamOutput(ReplayConfig* const config) :
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fifo_buffers_empty { buffers_empty.data(), buffer_count_max_log2 },
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fifo_buffers_full { buffers_full.data(), buffer_count_max_log2 },
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config { config },
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data { std::make_unique<uint8_t[]>(config->read_size * config->buffer_count) }
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{
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config->fifo_buffers_empty = &fifo_buffers_empty;
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config->fifo_buffers_full = &fifo_buffers_full;
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for(size_t i=0; i<config->buffer_count; i++) {
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// Set buffers to point consecutively in previously allocated unique_ptr "data"
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buffers[i] = { &(data.get()[i * config->read_size]), config->read_size };
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// Put all buffer pointers in the "empty buffer" FIFO
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fifo_buffers_empty.in(&buffers[i]);
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}
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}
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size_t StreamOutput::read(void* const data, const size_t length) {
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uint8_t* p = static_cast<uint8_t*>(data);
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size_t read = 0;
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while( read < length ) {
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if( !active_buffer ) {
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// We need a full buffer...
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if( !fifo_buffers_full.out(active_buffer) ) {
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// ...but none are available. Hole in transmission (inform app and stop ?)
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break;
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}
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}
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const auto remaining = length - read;
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read += active_buffer->read(&p[read], remaining);
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if( active_buffer->is_empty() ) {
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if( !fifo_buffers_empty.in(active_buffer) ) {
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// Empty buffers FIFO is already full.
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// This should never happen if the number of buffers is less
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// than the capacity of the FIFO.
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break;
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}
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// Tell M0 (IRQ) that a buffer has been consumed.
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active_buffer = nullptr;
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creg::m4txevent::assert_event();
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}
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}
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config->baseband_bytes_received += length;
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return read;
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}
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