mirror of
https://github.com/earlephilhower/libmad-8266.git
synced 2026-03-13 09:31:41 +08:00
dfcbff04e4
LIBMAD needs lots of memory for constants and internal variables, with both heap and stack really tight. Move all constants I can into PROGMEM, disable Layer-I and Layer-II decoders, move some things from the stack to heap, change some structures from char/short to ints to allow for PROGMEM easy access, and finally add a simple testbed. Tested with Newcleus' Jam On It, has 3K heap free. Needs memory optimization as well.
100 lines
2.3 KiB
C++
100 lines
2.3 KiB
C++
/*
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AudioFileSourcePROGMEM
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Store a "file" as a PROGMEM array and use it as audio source data
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Copyright (C) 2017 Earle F. Philhower, III
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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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#include "AudioFileSourcePROGMEM.h"
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AudioFileSourcePROGMEM::AudioFileSourcePROGMEM()
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{
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opened = false;
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progmemData = NULL;
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progmemLen = 0;
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filePointer = 0;
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}
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AudioFileSourcePROGMEM::AudioFileSourcePROGMEM(const void *data, uint32_t len)
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{
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open(data, len);
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}
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AudioFileSourcePROGMEM::~AudioFileSourcePROGMEM()
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{
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}
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bool AudioFileSourcePROGMEM::open(const void *data, uint32_t len)
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{
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if (!data || !len) return false;
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opened = true;
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progmemData = data;
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progmemLen = len;
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filePointer = 0;
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return true;
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}
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uint32_t AudioFileSourcePROGMEM::getSize()
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{
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if (!opened) return 0;
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return progmemLen;
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}
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bool AudioFileSourcePROGMEM::isOpen()
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{
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return opened;
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}
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bool AudioFileSourcePROGMEM::close()
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{
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opened = false;
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progmemData = NULL;
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progmemLen = 0;
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filePointer = 0;
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return true;
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}
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bool AudioFileSourcePROGMEM::seek(int32_t pos, int dir)
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{
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if (!opened) return false;
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uint32_t newPtr;
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switch (dir) {
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case SEEK_SET: newPtr = pos; break;
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case SEEK_CUR: newPtr = filePointer + pos; break;
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case SEEK_END: newPtr = progmemLen - pos; break;
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default: return false;
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}
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if (newPtr > progmemLen) return false;
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filePointer = newPtr;
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return true;
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}
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uint32_t AudioFileSourcePROGMEM::read(void *data, uint32_t len)
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{
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if (!opened) return 0;
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if (filePointer >= progmemLen) return 0;
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uint32_t toRead = progmemLen - filePointer;
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if (toRead > len) toRead = len;
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memcpy_P(data, reinterpret_cast<const uint8_t*>(progmemData)+filePointer, toRead);
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filePointer += toRead;
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return toRead;
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}
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