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/* 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.
*
* $URL$
* $Id$
*
*/
#include "teenagent/music.h"
#include "teenagent/resources.h"
namespace TeenAgent {
static const 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() {
if (_rows.empty())
return;
_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;
}
} // End of namespace TeenAgent
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