Built SDL2_image and _mixer static
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347
libsdl2_mixer/native_midi/native_midi_macosx.c
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347
libsdl2_mixer/native_midi/native_midi_macosx.c
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/*
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native_midi_macosx: Native Midi support on Mac OS X for the SDL_mixer library
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Copyright (C) 2009 Ryan C. Gordon <icculus@icculus.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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/* This is Mac OS X only, using Core MIDI.
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Mac OS 9 support via QuickTime is in native_midi_mac.c */
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#include "SDL_config.h"
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#if __MACOSX__
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#include <CoreServices/CoreServices.h> /* ComponentDescription */
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#include <AudioUnit/AudioUnit.h>
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#include <AudioToolbox/AudioToolbox.h>
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#include <AvailabilityMacros.h>
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#include "SDL_endian.h"
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#include "../SDL_mixer.h"
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#include "../mixer.h"
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#include "native_midi.h"
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/* Native Midi song */
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struct _NativeMidiSong
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{
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MusicPlayer player;
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MusicSequence sequence;
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MusicTimeStamp endTime;
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AudioUnit audiounit;
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int loops;
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};
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static NativeMidiSong *currentsong = NULL;
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static int latched_volume = MIX_MAX_VOLUME;
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static OSStatus
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GetSequenceLength(MusicSequence sequence, MusicTimeStamp *_sequenceLength)
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{
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// http://lists.apple.com/archives/Coreaudio-api/2003/Jul/msg00370.html
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// figure out sequence length
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UInt32 ntracks, i;
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MusicTimeStamp sequenceLength = 0;
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OSStatus err;
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err = MusicSequenceGetTrackCount(sequence, &ntracks);
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if (err != noErr)
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return err;
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for (i = 0; i < ntracks; ++i)
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{
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MusicTrack track;
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MusicTimeStamp tracklen = 0;
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UInt32 tracklenlen = sizeof (tracklen);
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err = MusicSequenceGetIndTrack(sequence, i, &track);
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if (err != noErr)
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return err;
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err = MusicTrackGetProperty(track, kSequenceTrackProperty_TrackLength,
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&tracklen, &tracklenlen);
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if (err != noErr)
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return err;
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if (sequenceLength < tracklen)
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sequenceLength = tracklen;
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}
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*_sequenceLength = sequenceLength;
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return noErr;
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}
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/* we're looking for the sequence output audiounit. */
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static OSStatus
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GetSequenceAudioUnit(MusicSequence sequence, AudioUnit *aunit)
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{
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AUGraph graph;
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UInt32 nodecount, i;
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OSStatus err;
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err = MusicSequenceGetAUGraph(sequence, &graph);
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if (err != noErr)
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return err;
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err = AUGraphGetNodeCount(graph, &nodecount);
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if (err != noErr)
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return err;
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for (i = 0; i < nodecount; i++) {
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AUNode node;
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if (AUGraphGetIndNode(graph, i, &node) != noErr)
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continue; /* better luck next time. */
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#if MAC_OS_X_VERSION_MIN_REQUIRED < 1050 /* this is deprecated, but works back to 10.0 */
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{
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struct ComponentDescription desc;
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UInt32 classdatasize = 0;
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void *classdata = NULL;
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err = AUGraphGetNodeInfo(graph, node, &desc, &classdatasize,
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&classdata, aunit);
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if (err != noErr)
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continue;
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else if (desc.componentType != kAudioUnitType_Output)
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continue;
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else if (desc.componentSubType != kAudioUnitSubType_DefaultOutput)
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continue;
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}
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#else /* not deprecated, but requires 10.5 or later */
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{
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# if !defined(AUDIO_UNIT_VERSION) || ((AUDIO_UNIT_VERSION + 0) < 1060)
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/* AUGraphAddNode () is changed to take an AudioComponentDescription*
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* desc parameter instead of a ComponentDescription* in the 10.6 SDK.
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* AudioComponentDescription is in 10.6 or newer, but it is actually
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* the same as struct ComponentDescription with 20 bytes of size and
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* the same offsets of all members, therefore, is binary compatible. */
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# define AudioComponentDescription ComponentDescription
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# endif
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AudioComponentDescription desc;
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if (AUGraphNodeInfo(graph, node, &desc, aunit) != noErr)
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continue;
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else if (desc.componentType != kAudioUnitType_Output)
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continue;
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else if (desc.componentSubType != kAudioUnitSubType_DefaultOutput)
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continue;
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}
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#endif
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return noErr; /* found it! */
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}
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return kAUGraphErr_NodeNotFound;
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}
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int native_midi_detect(void)
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{
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return 1; /* always available. */
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}
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NativeMidiSong *native_midi_loadsong_RW(SDL_RWops *src, int freesrc)
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{
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NativeMidiSong *retval = NULL;
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void *buf = NULL;
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Sint64 len = 0;
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CFDataRef data = NULL;
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if (SDL_RWseek(src, 0, RW_SEEK_END) < 0)
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goto fail;
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len = SDL_RWtell(src);
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if (len < 0)
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goto fail;
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if (SDL_RWseek(src, 0, RW_SEEK_SET) < 0)
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goto fail;
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buf = malloc(len);
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if (buf == NULL)
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goto fail;
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if (SDL_RWread(src, buf, len, 1) != 1)
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goto fail;
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retval = malloc(sizeof(NativeMidiSong));
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if (retval == NULL)
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goto fail;
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memset(retval, '\0', sizeof (*retval));
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if (NewMusicPlayer(&retval->player) != noErr)
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goto fail;
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if (NewMusicSequence(&retval->sequence) != noErr)
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goto fail;
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data = CFDataCreate(NULL, (const UInt8 *) buf, len);
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if (data == NULL)
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goto fail;
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free(buf);
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buf = NULL;
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#if MAC_OS_X_VERSION_MIN_REQUIRED < 1050
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/* MusicSequenceLoadSMFData() (avail. in 10.2, no 64 bit) is
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* equivalent to calling MusicSequenceLoadSMFDataWithFlags()
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* with a flags value of 0 (avail. in 10.3, avail. 64 bit).
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* So, we use MusicSequenceLoadSMFData() for powerpc versions
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* but the *WithFlags() on intel which require 10.4 anyway. */
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# if defined(__ppc__) || defined(__POWERPC__)
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if (MusicSequenceLoadSMFData(song->sequence, data) != noErr)
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goto fail;
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# else
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if (MusicSequenceLoadSMFDataWithFlags(retval->sequence, data, 0) != noErr)
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goto fail;
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# endif
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#else /* MusicSequenceFileLoadData() requires 10.5 or later. */
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if (MusicSequenceFileLoadData(retval->sequence, data, 0, 0) != noErr)
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goto fail;
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#endif
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CFRelease(data);
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data = NULL;
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if (GetSequenceLength(retval->sequence, &retval->endTime) != noErr)
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goto fail;
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if (MusicPlayerSetSequence(retval->player, retval->sequence) != noErr)
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goto fail;
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if (freesrc)
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SDL_RWclose(src);
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return retval;
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fail:
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if (retval) {
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if (retval->sequence)
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DisposeMusicSequence(retval->sequence);
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if (retval->player)
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DisposeMusicPlayer(retval->player);
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free(retval);
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}
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if (data)
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CFRelease(data);
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if (buf)
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free(buf);
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return NULL;
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}
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void native_midi_freesong(NativeMidiSong *song)
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{
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if (song != NULL) {
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if (currentsong == song)
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currentsong = NULL;
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MusicPlayerStop(song->player);
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DisposeMusicSequence(song->sequence);
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DisposeMusicPlayer(song->player);
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free(song);
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}
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}
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void native_midi_start(NativeMidiSong *song, int loops)
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{
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int vol;
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if (song == NULL)
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return;
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SDL_PauseAudio(1);
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Mix_UnlockAudio();
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if (currentsong)
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MusicPlayerStop(currentsong->player);
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currentsong = song;
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currentsong->loops = loops;
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MusicPlayerPreroll(song->player);
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MusicPlayerSetTime(song->player, 0);
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MusicPlayerStart(song->player);
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GetSequenceAudioUnit(song->sequence, &song->audiounit);
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vol = latched_volume;
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latched_volume++; /* just make this not match. */
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native_midi_setvolume(vol);
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Mix_LockAudio();
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SDL_PauseAudio(0);
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}
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void native_midi_pause(void)
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{
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}
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void native_midi_resume(void)
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{
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}
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void native_midi_stop(void)
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{
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if (currentsong) {
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SDL_PauseAudio(1);
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Mix_UnlockAudio();
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MusicPlayerStop(currentsong->player);
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currentsong = NULL;
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Mix_LockAudio();
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SDL_PauseAudio(0);
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}
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}
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int native_midi_active(void)
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{
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MusicTimeStamp currentTime = 0;
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if (currentsong == NULL)
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return 0;
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MusicPlayerGetTime(currentsong->player, ¤tTime);
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if ((currentTime < currentsong->endTime) ||
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(currentTime >= kMusicTimeStamp_EndOfTrack)) {
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return 1;
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} else if (currentsong->loops) {
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--currentsong->loops;
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MusicPlayerSetTime(currentsong->player, 0);
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return 1;
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}
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return 0;
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}
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void native_midi_setvolume(int volume)
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{
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if (latched_volume == volume)
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return;
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latched_volume = volume;
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if ((currentsong) && (currentsong->audiounit)) {
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const float floatvol = ((float) volume) / ((float) MIX_MAX_VOLUME);
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AudioUnitSetParameter(currentsong->audiounit, kHALOutputParam_Volume,
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kAudioUnitScope_Global, 0, floatvol, 0);
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}
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}
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const char *native_midi_error(void)
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{
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return ""; /* !!! FIXME */
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}
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#endif /* Mac OS X native MIDI support */
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