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Diffstat (limited to 'engines/sci/sound/drivers/amiga.cpp')
| -rw-r--r-- | engines/sci/sound/drivers/amiga.cpp | 676 |
1 files changed, 676 insertions, 0 deletions
diff --git a/engines/sci/sound/drivers/amiga.cpp b/engines/sci/sound/drivers/amiga.cpp new file mode 100644 index 0000000000..1dca092cc2 --- /dev/null +++ b/engines/sci/sound/drivers/amiga.cpp @@ -0,0 +1,676 @@ +/* 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 "sound/softsynth/emumidi.h" +#include "sci/sound/drivers/mididriver.h" + +#include "common/file.h" +#include "common/frac.h" +#include "common/util.h" + +namespace Sci { + +/* #define DEBUG */ + +// Frequencies for every note +// FIXME Store only one octave +static const int freq_table[] = { + 58, 62, 65, 69, 73, 78, 82, 87, + 92, 98, 104, 110, 117, 124, 131, 139, + 147, 156, 165, 175, 185, 196, 208, 220, + 234, 248, 262, 278, 294, 312, 331, 350, + 371, 393, 417, 441, 468, 496, 525, 556, + 589, 625, 662, 701, 743, 787, 834, 883, + 936, 992, 1051, 1113, 1179, 1250, 1324, 1403, + 1486, 1574, 1668, 1767, 1872, 1984, 2102, 2227, + 2359, 2500, 2648, 2806, 2973, 3149, 3337, 3535, + 3745, 3968, 4204, 4454, 4719, 5000, 5297, 5612, + 5946, 6299, 6674, 7071, 7491, 7937, 8408, 8908, + 9438, 10000, 10594, 11224, 11892, 12599, 13348, 14142, + 14983, 15874, 16817, 17817, 18877, 20000, 21189, 22449, + 23784, 25198, 26696, 28284, 29966, 31748, 33635, 35635, + 37754, 40000, 42378, 44898, 47568, 50396, 53393, 56568, + 59932, 63496, 67271, 71271, 75509, 80000, 84757, 89796 +}; + +class MidiDriver_Amiga : public MidiDriver_Emulated { +public: + enum { + kVoices = 4 + }; + + MidiDriver_Amiga(Audio::Mixer *mixer) : MidiDriver_Emulated(mixer), _playSwitch(true), _masterVolume(15) { } + virtual ~MidiDriver_Amiga() { } + + // MidiDriver + int open(); + void close(); + void send(uint32 b); + MidiChannel *allocateChannel() { return NULL; } + MidiChannel *getPercussionChannel() { return NULL; } + + // AudioStream + bool isStereo() const { return true; } + int getRate() const { return _mixer->getOutputRate(); } + + // MidiDriver_Emulated + void generateSamples(int16 *buf, int len); + + void setVolume(byte volume); + void playSwitch(bool play); + virtual uint32 property(int prop, uint32 param); + +private: + enum { + kModeLoop = 1 << 0, // Instrument looping flag + kModePitch = 1 << 1 // Instrument pitch changes flag + }; + + enum { + kChannels = 10, + kBaseFreq = 20000, // Samplerate of the instrument bank + kPanLeft = 91, + kPanRight = 164 + }; + + struct Channel { + int instrument; + int volume; + int pan; + }; + + struct Envelope { + int length; // Phase period length in samples + int delta; // Velocity delta per period + int target; // Target velocity + }; + + struct Voice { + int instrument; + int note; + int note_velocity; + int velocity; + int envelope; + int envelope_samples; // Number of samples till next envelope event + int decay; + int looping; + int hw_channel; + frac_t offset; + frac_t rate; + }; + + struct Instrument { + char name[30]; + int mode; + int size; // Size of non-looping part in bytes + int loop_size; // Starting offset and size of loop in bytes + int transpose; // Transpose value in semitones + Envelope envelope[4]; // Envelope + int8 *samples; + int8 *loop; + }; + + struct Bank { + char name[30]; + uint size; + Instrument *instruments[256]; + }; + + bool _playSwitch; + int _masterVolume; + int _frequency; + Envelope _envDecay; + Bank _bank; // Instrument bank + + Channel _channels[MIDI_CHANNELS]; + /* Internal channels */ + Voice _voices[kChannels]; + + void setEnvelope(Voice *channel, Envelope *envelope, int phase); + int interpolate(int8 *samples, frac_t offset); + void playInstrument(int16 *dest, Voice *channel, int count); + void changeInstrument(int channel, int instrument); + void stopChannel(int ch); + void stopNote(int ch, int note); + void startNote(int ch, int note, int velocity); + Instrument *readInstrument(Common::File &file, int *id); +}; + +void MidiDriver_Amiga::setEnvelope(Voice *channel, Envelope *envelope, int phase) { + channel->envelope = phase; + channel->envelope_samples = envelope[phase].length; + + if (phase == 0) + channel->velocity = channel->note_velocity / 2; + else + channel->velocity = envelope[phase - 1].target; +} + +int MidiDriver_Amiga::interpolate(int8 *samples, frac_t offset) { + int x = fracToInt(offset); + int diff = (samples[x + 1] - samples[x]) << 8; + + return (samples[x] << 8) + fracToInt(diff * (offset & FRAC_LO_MASK)); +} + +void MidiDriver_Amiga::playInstrument(int16 *dest, Voice *channel, int count) { + int index = 0; + int vol = _channels[channel->hw_channel].volume; + Instrument *instrument = _bank.instruments[channel->instrument]; + + while (1) { + /* Available source samples until end of segment */ + frac_t lin_avail; + int seg_end, rem, i, amount; + int8 *samples; + + if (channel->looping) { + samples = instrument->loop; + seg_end = instrument->loop_size; + } else { + samples = instrument->samples; + seg_end = instrument->size; + } + + lin_avail = intToFrac(seg_end) - channel->offset; + + rem = count - index; + + /* Amount of destination samples that we will compute this iteration */ + amount = lin_avail / channel->rate; + + if (lin_avail % channel->rate) + amount++; + + if (amount > rem) + amount = rem; + + /* Stop at next envelope event */ + if ((channel->envelope_samples != -1) && (amount > channel->envelope_samples)) + amount = channel->envelope_samples; + + for (i = 0; i < amount; i++) { + dest[index++] = interpolate(samples, channel->offset) * channel->velocity / 64 * channel->note_velocity * vol / (127 * 127); + channel->offset += channel->rate; + } + + if (channel->envelope_samples != -1) + channel->envelope_samples -= amount; + + if (channel->envelope_samples == 0) { + Envelope *envelope; + int delta, target, velocity; + + if (channel->decay) + envelope = &_envDecay; + else + envelope = &instrument->envelope[channel->envelope]; + + delta = envelope->delta; + target = envelope->target; + velocity = channel->velocity - envelope->delta; + + /* Check whether we have reached the velocity target for the current phase */ + if ((delta >= 0 && velocity <= target) || (delta < 0 && velocity >= target)) { + channel->velocity = target; + + /* Stop note after velocity has dropped to 0 */ + if (target == 0) { + channel->note = -1; + break; + } else + switch (channel->envelope) { + case 0: + case 2: + /* Go to next phase */ + setEnvelope(channel, instrument->envelope, channel->envelope + 1); + break; + case 1: + case 3: + /* Stop envelope */ + channel->envelope_samples = -1; + break; + } + } else { + /* We haven't reached the target yet */ + channel->envelope_samples = envelope->length; + channel->velocity = velocity; + } + } + + if (index == count) + break; + + if (fracToInt(channel->offset) >= seg_end) { + if (instrument->mode & kModeLoop) { + /* Loop the samples */ + channel->offset -= intToFrac(seg_end); + channel->looping = 1; + } else { + /* All samples have been played */ + channel->note = -1; + break; + } + } + } +} + +void MidiDriver_Amiga::changeInstrument(int channel, int instrument) { +#ifdef DEBUG + if (_bank.instruments[instrument]) + printf("[sfx:seq:amiga] Setting channel %i to \"%s\" (%i)\n", channel, _bank.instruments[instrument]->name, instrument); + else + warning("[sfx:seq:amiga] instrument %i does not exist (channel %i)", instrument, channel); +#endif + _channels[channel].instrument = instrument; +} + +void MidiDriver_Amiga::stopChannel(int ch) { + int i; + + /* Start decay phase for note on this hw channel, if any */ + for (i = 0; i < kChannels; i++) + if (_voices[i].note != -1 && _voices[i].hw_channel == ch && !_voices[i].decay) { + /* Trigger fast decay envelope */ + _voices[i].decay = 1; + _voices[i].envelope_samples = _envDecay.length; + break; + } +} + +void MidiDriver_Amiga::stopNote(int ch, int note) { + int channel; + Instrument *instrument; + + for (channel = 0; channel < kChannels; channel++) + if (_voices[channel].note == note && _voices[channel].hw_channel == ch && !_voices[channel].decay) + break; + + if (channel == kChannels) { +#ifdef DEBUG + warning("[sfx:seq:amiga] cannot stop note %i on channel %i", note, ch); +#endif + return; + } + + instrument = _bank.instruments[_voices[channel].instrument]; + + /* Start the envelope phases for note-off if looping is on and envelope is enabled */ + if ((instrument->mode & kModeLoop) && (instrument->envelope[0].length != 0)) + setEnvelope(&_voices[channel], instrument->envelope, 2); +} + +void MidiDriver_Amiga::startNote(int ch, int note, int velocity) { + Instrument *instrument; + int channel; + + if (_channels[ch].instrument < 0 || _channels[ch].instrument > 255) { + warning("[sfx:seq:amiga] invalid instrument %i on channel %i", _channels[ch].instrument, ch); + return; + } + + instrument = _bank.instruments[_channels[ch].instrument]; + + if (!instrument) { + warning("[sfx:seq:amiga] instrument %i does not exist", _channels[ch].instrument); + return; + } + + for (channel = 0; channel < kChannels; channel++) + if (_voices[channel].note == -1) + break; + + if (channel == kChannels) { + warning("[sfx:seq:amiga] could not find a free channel"); + return; + } + + stopChannel(ch); + + if (instrument->mode & kModePitch) { + int fnote = note + instrument->transpose; + + if (fnote < 0 || fnote > 127) { + warning("[sfx:seq:amiga] illegal note %i\n", fnote); + return; + } + + /* Compute rate for note */ + _voices[channel].rate = doubleToFrac(freq_table[fnote] / (double) _frequency); + } else + _voices[channel].rate = doubleToFrac(kBaseFreq / (double) _frequency); + + _voices[channel].instrument = _channels[ch].instrument; + _voices[channel].note = note; + _voices[channel].note_velocity = velocity; + + if ((instrument->mode & kModeLoop) && (instrument->envelope[0].length != 0)) + setEnvelope(&_voices[channel], instrument->envelope, 0); + else { + _voices[channel].velocity = 64; + _voices[channel].envelope_samples = -1; + } + + _voices[channel].offset = 0; + _voices[channel].hw_channel = ch; + _voices[channel].decay = 0; + _voices[channel].looping = 0; +} + +MidiDriver_Amiga::Instrument *MidiDriver_Amiga::readInstrument(Common::File &file, int *id) { + Instrument *instrument; + byte header[61]; + int size; + int seg_size[3]; + int loop_offset; + int i; + + if (file.read(header, 61) < 61) { + warning("[sfx:seq:amiga] failed to read instrument header"); + return NULL; + } + + instrument = new Instrument; + + seg_size[0] = READ_BE_UINT16(header + 35) * 2; + seg_size[1] = READ_BE_UINT16(header + 41) * 2; + seg_size[2] = READ_BE_UINT16(header + 47) * 2; + + instrument->mode = header[33]; + instrument->transpose = (int8) header[34]; + for (i = 0; i < 4; i++) { + int length = (int8) header[49 + i]; + + if (length == 0 && i > 0) + length = 256; + + instrument->envelope[i].length = length * _frequency / 60; + instrument->envelope[i].delta = (int8)header[53 + i]; + instrument->envelope[i].target = header[57 + i]; + } + /* Final target must be 0 */ + instrument->envelope[3].target = 0; + + loop_offset = READ_BE_UINT32(header + 37) & ~1; + size = seg_size[0] + seg_size[1] + seg_size[2]; + + *id = READ_BE_UINT16(header); + + strncpy(instrument->name, (char *) header + 2, 29); + instrument->name[29] = 0; +#ifdef DEBUG + printf("[sfx:seq:amiga] Reading instrument %i: \"%s\" (%i bytes)\n", + *id, instrument->name, size); + printf(" Mode: %02x\n", instrument->mode); + printf(" Looping: %s\n", instrument->mode & kModeLoop ? "on" : "off"); + printf(" Pitch changes: %s\n", instrument->mode & kModePitch ? "on" : "off"); + printf(" Segment sizes: %i %i %i\n", seg_size[0], seg_size[1], seg_size[2]); + printf(" Segment offsets: 0 %i %i\n", loop_offset, read_int32(header + 43)); +#endif + instrument->samples = (int8 *) malloc(size + 1); + if (file.read(instrument->samples, size) < (unsigned int)size) { + warning("[sfx:seq:amiga] failed to read instrument samples"); + free(instrument->samples); + delete instrument; + return NULL; + } + + if (instrument->mode & kModeLoop) { + if (loop_offset + seg_size[1] > size) { +#ifdef DEBUG + warning("[sfx:seq:amiga] looping samples extend %i bytes past end of sample block", + loop_offset + seg_size[1] - size); +#endif + seg_size[1] = size - loop_offset; + } + + if (seg_size[1] < 0) { + warning("[sfx:seq:amiga] invalid looping point"); + free(instrument->samples); + delete instrument; + return NULL; + } + + instrument->size = seg_size[0]; + instrument->loop_size = seg_size[1]; + + instrument->loop = (int8*)malloc(instrument->loop_size + 1); + memcpy(instrument->loop, instrument->samples + loop_offset, instrument->loop_size); + + instrument->samples[instrument->size] = instrument->loop[0]; + instrument->loop[instrument->loop_size] = instrument->loop[0]; + } else { + instrument->loop = NULL; + instrument->size = size; + instrument->samples[instrument->size] = 0; + } + + return instrument; +} + +uint32 MidiDriver_Amiga::property(int prop, uint32 param) { + switch(prop) { + case MIDI_PROP_MASTER_VOLUME: + if (param != 0xffff) + _masterVolume = param; + return _masterVolume; + default: + break; + } + return 0; +} + +int MidiDriver_Amiga::open() { + _frequency = _mixer->getOutputRate(); + _envDecay.length = _frequency / (32 * 64); + _envDecay.delta = 1; + _envDecay.target = 0; + + Common::File file; + byte header[40]; + + if (!file.open("bank.001")) { + warning("[sfx:seq:amiga] file bank.001 not found"); + return Common::kUnknownError; + } + + if (file.read(header, 40) < 40) { + warning("[sfx:seq:amiga] failed to read header of file bank.001"); + return Common::kUnknownError; + } + + for (uint i = 0; i < 256; i++) + _bank.instruments[i] = NULL; + + for (uint i = 0; i < kChannels; i++) { + _voices[i].note = -1; + _voices[i].hw_channel = 0; + } + + for (uint i = 0; i < MIDI_CHANNELS; i++) { + _channels[i].instrument = -1; + _channels[i].volume = 127; + _channels[i].pan = (i % 4 == 0 || i % 4 == 3 ? kPanLeft : kPanRight); + } + + _bank.size = READ_BE_UINT16(header + 38); + strncpy(_bank.name, (char *) header + 8, 29); + _bank.name[29] = 0; +#ifdef DEBUG + printf("[sfx:seq:amiga] Reading %i instruments from bank \"%s\"\n", _bank.size, _bank.name); +#endif + + for (uint i = 0; i < _bank.size; i++) { + int id; + Instrument *instrument = readInstrument(file, &id); + + if (!instrument) { + warning("[sfx:seq:amiga] failed to read bank.001"); + return Common::kUnknownError; + } + + if (id < 0 || id > 255) { + warning("[sfx:seq:amiga] Error: instrument ID out of bounds"); + return Common::kUnknownError; + } + + _bank.instruments[id] = instrument; + } + + MidiDriver_Emulated::open(); + + _mixer->playInputStream(Audio::Mixer::kPlainSoundType, &_mixerSoundHandle, this, -1, _mixer->kMaxChannelVolume, 0, DisposeAfterUse::NO); + + return Common::kNoError; +} + +void MidiDriver_Amiga::close() { + _mixer->stopHandle(_mixerSoundHandle); + + for (uint i = 0; i < _bank.size; i++) { + if (_bank.instruments[i]) { + if (_bank.instruments[i]->loop) + free(_bank.instruments[i]->loop); + free(_bank.instruments[i]->samples); + delete _bank.instruments[i]; + } + } +} + +void MidiDriver_Amiga::playSwitch(bool play) { + _playSwitch = play; +} + +void MidiDriver_Amiga::setVolume(byte volume_) { + _masterVolume = volume_; +} + +void MidiDriver_Amiga::send(uint32 b) { + byte command = b & 0xf0; + byte channel = b & 0xf; + byte op1 = (b >> 8) & 0xff; + byte op2 = (b >> 16) & 0xff; + + switch (command) { + case 0x80: + stopNote(channel, op1); + break; + case 0x90: + if (op2 > 0) + startNote(channel, op1, op2); + else + stopNote(channel, op1); + break; + case 0xb0: + switch (op1) { + case 0x07: + _channels[channel].volume = op2; + break; + case 0x0a: +#ifdef DEBUG + warning("[sfx:seq:amiga] ignoring pan 0x%02x event for channel %i", op2, channel); +#endif + break; + case 0x7b: + stopChannel(channel); + break; + default: + warning("[sfx:seq:amiga] unknown control event 0x%02x", op1); + } + break; + case 0xc0: + changeInstrument(channel, op1); + break; + default: + warning("[sfx:seq:amiga] unknown event %02x", command); + } +} + +void MidiDriver_Amiga::generateSamples(int16 *data, int len) { + if (len == 0) + return; + + int16 *buffers = (int16*)malloc(len * 2 * kChannels); + + memset(buffers, 0, len * 2 * kChannels); + + /* Generate samples for all notes */ + for (int i = 0; i < kChannels; i++) + if (_voices[i].note >= 0) + playInstrument(buffers + i * len, &_voices[i], len); + + if (isStereo()) { + for (int j = 0; j < len; j++) { + int mixedl = 0, mixedr = 0; + + /* Mix and pan */ + for (int i = 0; i < kChannels; i++) { + mixedl += buffers[i * len + j] * (256 - _channels[_voices[i].hw_channel].pan); + mixedr += buffers[i * len + j] * _channels[_voices[i].hw_channel].pan; + } + + /* Adjust volume */ + data[2 * j] = mixedl * _masterVolume >> 13; + data[2 * j + 1] = mixedr * _masterVolume >> 13; + } + } else { + for (int j = 0; j < len; j++) { + int mixed = 0; + + /* Mix */ + for (int i = 0; i < kChannels; i++) + mixed += buffers[i * len + j]; + + /* Adjust volume */ + data[j] = mixed * _masterVolume >> 6; + } + } + + free(buffers); +} + +class MidiPlayer_Amiga : public MidiPlayer { +public: + MidiPlayer_Amiga() { _driver = new MidiDriver_Amiga(g_system->getMixer()); } + byte getPlayId(SciVersion soundVersion); + int getPolyphony() const { return MidiDriver_Amiga::kVoices; } + bool hasRhythmChannel() const { return false; } + void setVolume(byte volume) { static_cast<MidiDriver_Amiga *>(_driver)->setVolume(volume); } + void playSwitch(bool play) { static_cast<MidiDriver_Amiga *>(_driver)->playSwitch(play); } + void loadInstrument(int idx, byte *data); +}; + +MidiPlayer *MidiPlayer_Amiga_create() { + return new MidiPlayer_Amiga(); +} + +byte MidiPlayer_Amiga::getPlayId(SciVersion soundVersion) { + if (soundVersion != SCI_VERSION_0_LATE) + error("Amiga sound support not available for this SCI version"); + + return 0x40; +} + +} // End of namespace Sci |