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/*
* This file is part of OpenTTD.
* OpenTTD 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, version 2.
* OpenTTD 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file cocoa_m.cpp
* @brief MIDI music player for MacOS X using CoreAudio.
*/
#ifdef WITH_COCOA
#include "../stdafx.h"
#include "../os/macosx/macos.h"
#include "cocoa_m.h"
#include "midifile.hpp"
#include "../debug.h"
#include "../base_media_base.h"
#include <CoreServices/CoreServices.h>
#include <AudioUnit/AudioUnit.h>
#include <AudioToolbox/AudioToolbox.h>
#include "../safeguards.h"
#if !defined(HAVE_OSX_1011_SDK)
#define kMusicSequenceFile_AnyType 0
#endif
static FMusicDriver_Cocoa iFMusicDriver_Cocoa;
static MusicPlayer _player = nullptr;
static MusicSequence _sequence = nullptr;
static MusicTimeStamp _seq_length = 0;
static bool _playing = false;
static byte _volume = 127;
/** Set the volume of the current sequence. */
static void DoSetVolume()
{
if (_sequence == nullptr) return;
AUGraph graph;
MusicSequenceGetAUGraph(_sequence, &graph);
AudioUnit output_unit = nullptr;
/* Get output audio unit */
UInt32 node_count = 0;
AUGraphGetNodeCount(graph, &node_count);
for (UInt32 i = 0; i < node_count; i++) {
AUNode node;
AUGraphGetIndNode(graph, i, &node);
AudioUnit unit;
AudioComponentDescription desc;
AUGraphNodeInfo(graph, node, &desc, &unit);
if (desc.componentType == kAudioUnitType_Output) {
output_unit = unit;
break;
}
}
if (output_unit == nullptr) {
DEBUG(driver, 1, "cocoa_m: Failed to get output node to set volume");
return;
}
Float32 vol = _volume / 127.0f; // 0 - +127 -> 0.0 - 1.0
AudioUnitSetParameter(output_unit, kHALOutputParam_Volume, kAudioUnitScope_Global, 0, vol, 0);
}
/**
* Initialized the MIDI player, including QuickTime initialization.
*/
const char *MusicDriver_Cocoa::Start(const char * const *parm)
{
if (NewMusicPlayer(&_player) != noErr) return "failed to create music player";
return nullptr;
}
/**
* Checks whether the player is active.
*/
bool MusicDriver_Cocoa::IsSongPlaying()
{
if (!_playing) return false;
MusicTimeStamp time = 0;
MusicPlayerGetTime(_player, &time);
return time < _seq_length;
}
/**
* Stops the MIDI player.
*/
void MusicDriver_Cocoa::Stop()
{
if (_player != nullptr) DisposeMusicPlayer(_player);
if (_sequence != nullptr) DisposeMusicSequence(_sequence);
}
/**
* Starts playing a new song.
*
* @param song Description of music to load and play
*/
void MusicDriver_Cocoa::PlaySong(const MusicSongInfo &song)
{
std::string filename = MidiFile::GetSMFFile(song);
DEBUG(driver, 2, "cocoa_m: trying to play '%s'", filename.c_str());
this->StopSong();
if (_sequence != nullptr) {
DisposeMusicSequence(_sequence);
_sequence = nullptr;
}
if (filename.empty()) return;
if (NewMusicSequence(&_sequence) != noErr) {
DEBUG(driver, 0, "cocoa_m: Failed to create music sequence");
return;
}
const char *os_file = OTTD2FS(filename.c_str());
CFAutoRelease<CFURLRef> url(CFURLCreateFromFileSystemRepresentation(kCFAllocatorDefault, (const UInt8*)os_file, strlen(os_file), false));
if (MusicSequenceFileLoad(_sequence, url.get(), kMusicSequenceFile_AnyType, 0) != noErr) {
DEBUG(driver, 0, "cocoa_m: Failed to load MIDI file");
return;
}
/* Construct audio graph */
AUGraph graph = nullptr;
MusicSequenceGetAUGraph(_sequence, &graph);
AUGraphOpen(graph);
if (AUGraphInitialize(graph) != noErr) {
DEBUG(driver, 0, "cocoa_m: Failed to initialize AU graph");
return;
}
/* Figure out sequence length */
UInt32 num_tracks;
MusicSequenceGetTrackCount(_sequence, &num_tracks);
_seq_length = 0;
for (UInt32 i = 0; i < num_tracks; i++) {
MusicTrack track = nullptr;
MusicTimeStamp track_length = 0;
UInt32 prop_size = sizeof(MusicTimeStamp);
MusicSequenceGetIndTrack(_sequence, i, &track);
MusicTrackGetProperty(track, kSequenceTrackProperty_TrackLength, &track_length, &prop_size);
if (track_length > _seq_length) _seq_length = track_length;
}
/* Add 8 beats for reverb/long note release */
_seq_length += 8;
DoSetVolume();
MusicPlayerSetSequence(_player, _sequence);
MusicPlayerPreroll(_player);
if (MusicPlayerStart(_player) != noErr) return;
_playing = true;
DEBUG(driver, 3, "cocoa_m: playing '%s'", filename.c_str());
}
/**
* Stops playing the current song, if the player is active.
*/
void MusicDriver_Cocoa::StopSong()
{
MusicPlayerStop(_player);
MusicPlayerSetSequence(_player, nullptr);
_playing = false;
}
/**
* Changes the playing volume of the MIDI player.
*
* @param vol The desired volume, range of the value is @c 0-127
*/
void MusicDriver_Cocoa::SetVolume(byte vol)
{
_volume = vol;
DoSetVolume();
}
#endif /* WITH_COCOA */
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