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Diffstat (limited to 'engines/teenagent/music.cpp')
| -rw-r--r-- | engines/teenagent/music.cpp | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/engines/teenagent/music.cpp b/engines/teenagent/music.cpp new file mode 100644 index 0000000000..ba902e571a --- /dev/null +++ b/engines/teenagent/music.cpp @@ -0,0 +1,162 @@ +/* ScummVM - Graphic Adventure Engine + * + * ScummVM is the legal property of its developers, whose names + * are too numerous to list here. Please refer to the COPYRIGHT + * file distributed with this source distribution. + * + * 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 + * of the License, 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; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * $URL: https://www.switchlink.se/svn/teen/old_engine/music.cpp $ + * $Id: music.cpp 121 2009-08-02 20:04:53Z megath $ + * + */ + +#include "music.h" +#include "resources.h" + +using namespace TeenAgent; + +static uint32 noteToPeriod[3][12] = { + {855, 807, 761, 720, 678, 640, 604, 569, 537, 508, 480, 453}, + {428, 404, 381, 360, 338, 320, 301, 285, 269, 254, 239, 226}, + {214, 201, 189, 179, 170, 160, 151, 143, 135, 127, 120, 113} +}; + +MusicPlayer::MusicPlayer() : Paula(false, 44100, 5000), _id(0) { +} + +MusicPlayer::~MusicPlayer() { +} + +bool MusicPlayer::load(int id) { + Resources * res = Resources::instance(); + + Common::SeekableReadStream *stream = res->mmm.getStream(id); + if (stream == NULL) + return false; + + char header[4]; + stream->read(header, 4); + //check header? + + memset(_samples, 0, sizeof(_samples)); + + // Load the samples + + sampleCount = stream->readByte(); + + debug(0, "sampleCount = %d", sampleCount); + + for (byte currSample = 0; currSample < sampleCount; currSample++) { + byte sample = stream->readByte(); + + // Load the sample data + byte sampleResource = ((sample >> 4) & 0x0F) * 10 + (sample & 0x0F); + debug(0, "currSample = %d, sample = 0x%02x, resource: %d", currSample, sample, sampleResource); + uint32 sampleSize = res->sam_mmm.get_size(sampleResource); + Common::SeekableReadStream *in = res->sam_mmm.getStream(sampleResource); + + if (in == 0) { + warning("load: invalid sample %d (0x%02x)", sample, sample); + _samples[sample].data = NULL; + _samples[sample].size = 0; + continue; + } + + byte *sampleData = new byte[sampleSize]; + in->read(sampleData, sampleSize); + + // Convert the sample from signed to unsigned + for (uint32 i = 0; i < sampleSize; i++) + *sampleData ^= 0x80; + + delete _samples[sample].data; + _samples[sample].data = sampleData; + _samples[sample].size = sampleSize; + } + + // Load the music data + + _rows.clear(); + + Row row; + row.channels[0].sample = 0; + row.channels[1].sample = 0; + row.channels[2].sample = 0; + + row.channels[0].volume = 64; + row.channels[1].volume = 64; + row.channels[2].volume = 64; + + while (!stream->eos()) { + + byte cmd = stream->readByte(); + + if ((cmd & 0xF0) == 0x50) { + row.channels[(cmd & 0x0F) - 1].sample = stream->readByte(); + } else if ((cmd & 0xF0) == 0x40) { + row.channels[(cmd & 0x0F) - 1].volume = (stream->readByte() + 1) * 2; + } else { + row.channels[0].note = cmd; + row.channels[1].note = stream->readByte(); + row.channels[2].note = stream->readByte(); + _rows.push_back(row); + } + + } + _currRow = 0; + _id = id; + return true; +} + +void MusicPlayer::start() { + _currRow = 0; + startPaula(); +} + +void MusicPlayer::stop() { + stopPaula(); +} + +void MusicPlayer::interrupt() { + _currRow %= _rows.size(); + + Row *row = &_rows[_currRow]; + for (int chn = 0; chn < 3; ++chn) { + setChannelVolume(chn, row->channels[chn].volume); + + //debug(0, "row->channels[%d].volume = %d", chn, row->channels[chn].volume); + + byte sample = (row->channels[chn].sample); + if (row->channels[chn].note != 0 && sample != 0) { + + //debug(0, "row->channels[%d].note = %d", chn, row->channels[chn].note); + //debug(0, "row->channels[%d].sample = %d", chn, row->channels[chn].sample); + + byte note = row->channels[chn].note; + if (_samples[sample].size == 0) { + warning("interrupt: invalid sample %u (0x%02x)", sample, sample); + continue; + } + + setChannelData(chn, (const int8*)_samples[sample].data, NULL, _samples[sample].size, 0); + setChannelPeriod(chn, noteToPeriod[((note >> 4) & 0x0F) - 1][(note & 0x0F)]); + } + } + + //debug(0, "------------------------------------------------"); + + ++_currRow; +} |