[vlc-devel] [PATCH] codec/audiotoolbox_midi: Add AudioToolbox MIDI decoder
Marvin Scholz
epirat07 at gmail.com
Tue Nov 28 13:30:27 CET 2017
On 28 Nov 2017, at 13:28, Thomas Guillem wrote:
> On Tue, Nov 28, 2017, at 13:16, Marvin Scholz wrote:
>> ---
>> configure.ac | 6 +
>> modules/codec/Makefile.am | 6 +
>> modules/codec/audiotoolbox_midi.c | 382
>> ++++++++++++++++++++++++++++++++++++++
>> 3 files changed, 394 insertions(+)
>> create mode 100644 modules/codec/audiotoolbox_midi.c
>>
>> diff --git a/configure.ac b/configure.ac
>> index c46819ff3d..785eea6cc3 100644
>> --- a/configure.ac
>> +++ b/configure.ac
>> @@ -3894,6 +3894,12 @@ AC_CHECK_HEADERS(VideoToolbox/VideoToolbox.h,
>> [
>> ])
>>
>> dnl
>> +dnl AudioToolbox MIDI plugin
>> +AC_CHECK_HEADERS([AudioToolbox/AudioToolbox.h], [
>> + VLC_ADD_PLUGIN([audiotoolboxmidi])
>> +])
>> +
>> +dnl
>> dnl ncurses module
>> dnl
>> AC_ARG_ENABLE(ncurses,
>> diff --git a/modules/codec/Makefile.am b/modules/codec/Makefile.am
>> index 075ee2a0e9..6a8a72019c 100644
>> --- a/modules/codec/Makefile.am
>> +++ b/modules/codec/Makefile.am
>> @@ -60,6 +60,12 @@ if HAVE_DARWIN
>> libfluidsynth_plugin_la_LDFLAGS +=
>> -Wl,-framework,CoreFoundation,-framework,CoreServices
>> endif
>>
>> +libaudiotoolboxmidi_plugin_la_SOURCES = codec/audiotoolbox_midi.c
>> +libaudiotoolboxmidi_plugin_la_LDFLAGS = $(AM_LDFLAGS) -rpath
>> '$(codecdir)'
>> +libaudiotoolboxmidi_plugin_la_LDFLAGS +=
>> -Wl,-framework,CoreFoundation,-framework,AudioUnit,-framework,AudioToolbox
>> +EXTRA_LTLIBRARIES += libaudiotoolboxmidi_plugin.la
>> +codec_LTLIBRARIES += $(LTLIBaudiotoolboxmidi)
>> +
>> liblpcm_plugin_la_SOURCES = codec/lpcm.c
>> codec_LTLIBRARIES += liblpcm_plugin.la
>>
>> diff --git a/modules/codec/audiotoolbox_midi.c
>> b/modules/codec/audiotoolbox_midi.c
>> new file mode 100644
>> index 0000000000..5a8547fce1
>> --- /dev/null
>> +++ b/modules/codec/audiotoolbox_midi.c
>> @@ -0,0 +1,382 @@
>> +/*****************************************************************************
>> + * audiotoolbox_midi.c: Software MIDI synthesizer using AudioToolbox
>> +
>> *****************************************************************************
>> + * Copyright (C) 2017 VLC authors and VideoLAN
>> + * $Id$
>> + *
>> + * Authors: Marvin Scholz <epirat07 at gmail dot com>
>> + *
>> + * Based on the fluidsynth module by Rémi Denis-Courmont
>> + *
>> + * This program is free software; you can redistribute it and/or
>> modify
>> it
>> + * under the terms of the GNU Lesser General Public License as
>> published
>> by
>> + * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
>> + *
>> + * You should have received a copy of the GNU Lesser 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.
>> +
>> *****************************************************************************/
>> +
>> +#ifdef HAVE_CONFIG_H
>> +# include "config.h"
>> +#endif
>> +
>> +#include <vlc_common.h>
>> +#include <vlc_plugin.h>
>> +#include <vlc_codec.h>
>> +#include <vlc_dialog.h>
>> +
>> +#include <CoreFoundation/CoreFoundation.h>
>> +#include <AudioUnit/AudioUnit.h>
>> +#include <AudioToolbox/AudioToolbox.h>
>> +
>> +#include <TargetConditionals.h>
>> +
>> +#ifndef require_noerr
>> +#define require_noerr(errorCode, exceptionLabel) \
>> +do { if ((errorCode) != noErr) goto exceptionLabel; \
>> +} while ( 0 )
>> +#endif
>> +
>> +#define SOUNDFONT_TEXT N_("Sound font file")
>> +#define SOUNDFONT_LONGTEXT N_( \
>> + "The Sound Font file (SF2/DLS) to use for synthesis.")
>> +
>> +static int Open (vlc_object_t *);
>> +static void Close (vlc_object_t *);
>> +
>> +#define CFG_PREFIX "aumidi-"
>> +
>> +vlc_module_begin()
>> + set_description(N_("AudioToolbox MIDI synthesizer"))
>> + set_capability("audio decoder", 100)
>> + set_shortname(N_("AUMIDI"))
>> + set_category(CAT_INPUT)
>> + set_subcategory(SUBCAT_INPUT_ACODEC)
>> + set_callbacks(Open, Close)
>> + add_loadfile(CFG_PREFIX "soundfont", "",
>> + SOUNDFONT_TEXT, SOUNDFONT_LONGTEXT, false)
>> +vlc_module_end()
>> +
>> +
>> +struct decoder_sys_t
>> +{
>> + AUGraph graph;
>> + AudioUnit synthUnit;
>> + AudioUnit outputUnit;
>> + date_t end_date;
>> +};
>> +
>> +static int DecodeBlock (decoder_t *p_dec, block_t *p_block);
>> +static void Flush (decoder_t *);
>> +
>> +/* MIDI constants */
>> +enum
>> +{
>> + kMidiMessage_NoteOff = 0x80,
>> + kMidiMessage_NoteOn = 0x90,
>> + kMidiMessage_PolyPressure = 0xA0,
>> + kMidiMessage_ControlChange = 0xB0,
>> + kMidiMessage_ProgramChange = 0xC0,
>> + kMidiMessage_ChannelPressure = 0xD0,
>> + kMidiMessage_PitchWheel = 0xE0,
>> + kMidiMessage_SysEx = 0xF0,
>> +
>> + kMidiMessage_BankMSBControl = 0,
>> + kMidiMessage_BankLSBControl = 32,
>> +
>> + /* Values for kMidiMessage_ControlChange */
>> + kMidiController_AllSoundOff = 0x78,
>> + kMidiController_ResetAllControllers = 0x79,
>> + kMidiController_AllNotesOff = 0x7B
>> +};
>> +
>> +static OSStatus CreateAUGraph(AUGraph *outGraph, AudioUnit
>> *outSynth,
>> AudioUnit *outOut)
>> +{
>> + OSStatus result;
>> +
>> + // AudioUnit nodes
>> + AUNode synthNode, limiterNode, outNode;
>> +
>> + AudioComponentDescription cd = {};
>> + cd.componentManufacturer = kAudioUnitManufacturer_Apple;
>> +
>> + require_noerr(result = NewAUGraph(outGraph), bailout);
>> +
>> + // Create/add the MIDI synthesizer node (DLS Synth)
>> + cd.componentType = kAudioUnitType_MusicDevice;
>> +
>> +#if TARGET_OS_IPHONE
>> + // On iOS/tvOS use MIDISynth, DLSSynth does not exist there
>> + cd.componentSubType = kAudioUnitSubType_MIDISynth;
>> +#else
>> + cd.componentSubType = kAudioUnitSubType_DLSSynth;
>> +#endif
>> +
>> + require_noerr(result = AUGraphAddNode(*outGraph, &cd,
>> &synthNode),
>> bailout);
>> +
>> + // Create/add the peak limiter node
>> + cd.componentType = kAudioUnitType_Effect;
>> + cd.componentSubType = kAudioUnitSubType_PeakLimiter;
>> + require_noerr(result = AUGraphAddNode(*outGraph, &cd,
>> &limiterNode),
>> bailout);
>> +
>> + // Create/add the output node (GenericOutput)
>> + cd.componentType = kAudioUnitType_Output;
>> + cd.componentSubType = kAudioUnitSubType_GenericOutput;
>> + require_noerr(result = AUGraphAddNode(*outGraph, &cd, &outNode),
>> bailout);
>> +
>> + require_noerr(result = AUGraphOpen(*outGraph), bailout);
>> +
>> + // Connect the synthesizer node to the limiter
>> + require_noerr(result = AUGraphConnectNodeInput(*outGraph,
>> synthNode,
>> 0, limiterNode, 0), bailout);
>> +
>> + // Connect the limiter node to the output
>> + require_noerr(result = AUGraphConnectNodeInput(*outGraph,
>> limiterNode, 0, outNode, 0), bailout);
>> +
>> + // Get reference to the synthesizer node
>> + require_noerr(result = AUGraphNodeInfo(*outGraph, synthNode, 0,
>> outSynth), bailout);
>> +
>> + // Get reference to the output node
>> + require_noerr(result = AUGraphNodeInfo(*outGraph, outNode, 0,
>> outOut), bailout);
>> +
>> +bailout:
>> + return result;
>> +}
>> +
>> +static int Open (vlc_object_t *p_this)
>> +{
>> + decoder_t *p_dec = (decoder_t *)p_this;
>> + OSStatus status = noErr;
>> +
>> + if (p_dec->fmt_in.i_codec != VLC_CODEC_MIDI)
>> + return VLC_EGENERIC;
>> +
>> + decoder_sys_t *p_sys = malloc(sizeof (*p_sys));
>> + if (unlikely(p_sys == NULL))
>> + return VLC_ENOMEM;
>> +
>> + status = CreateAUGraph(&p_sys->graph, &p_sys->synthUnit,
>> &p_sys->outputUnit);
>> + if (unlikely(status != noErr)) {
>> + msg_Err(p_dec, "failed to create audiograph (%i)", status);
>> + return VLC_EGENERIC;
>> + }
>> +
>> + // Set custom soundfont, if any specified
>> + char *sfPath = var_InheritString(p_dec, CFG_PREFIX "soundfont");
>> + if (sfPath != NULL) {
>> + msg_Dbg(p_dec, "using custom soundfont: '%s'", sfPath);
>> + CFURLRef url =
>> CFURLCreateFromFileSystemRepresentation(kCFAllocatorDefault,
>> + (const
>> UInt8 *)sfPath,
>> +
>> strlen(sfPath), false);
>> + if (unlikely(url == NULL))
>> + return VLC_ENOMEM;
>> +
>> + status = AudioUnitSetProperty(p_sys->synthUnit,
>> +
>> kMusicDeviceProperty_SoundBankURL,
>> + kAudioUnitScope_Global, 0,
>> + &url, sizeof(url));
>> + CFRelease(url);
>> + free(sfPath);
>> +
>> + if (status != noErr) {
>> + msg_Err(p_dec, "failed setting custom SoundFont for MIDI
>> synthesis (%i)", status);
>> + return VLC_EGENERIC;
>> + }
>> + } else {
>> + msg_Dbg(p_dec, "using default soundfont");
>> + }
>> +
>> + // Prepare AudioUnit output audio format info
>> + AudioStreamBasicDescription ASBD = {};
>> + size_t bytesPerSample = sizeof(Float32);
>> + ASBD.mFormatID = kAudioFormatLinearPCM;
>> + ASBD.mFormatFlags = kAudioFormatFlagIsFloat |
>> kAudioFormatFlagIsPacked;
>> + ASBD.mSampleRate = 44100;
>> + ASBD.mFramesPerPacket = 1;
>> + ASBD.mChannelsPerFrame = 2;
>> + ASBD.mBytesPerFrame = bytesPerSample * ASBD.mChannelsPerFrame;
>> + ASBD.mBytesPerPacket = ASBD.mBytesPerFrame *
>> ASBD.mFramesPerPacket;
>> + ASBD.mBitsPerChannel = 8 * bytesPerSample;
>> +
>> + // Set AudioUnit format
>> + status = AudioUnitSetProperty(p_sys->outputUnit,
>> + kAudioUnitProperty_StreamFormat,
>> + kAudioUnitScope_Output, 0, &ASBD,
>> +
>> sizeof(AudioStreamBasicDescription));
>> + if (unlikely(status != noErr)) {
>> + msg_Err(p_dec, "failed setting output format for output unit
>> (%i)", status);
>> + return VLC_EGENERIC;
>> + }
>> +
>> +
>> + // Prepare the AU
>> + status = AUGraphInitialize (p_sys->graph);
>> + if (unlikely(status != noErr)) {
>> + if (status == kAudioUnitErr_InvalidFile)
>> + msg_Err(p_dec, "failed initializing audiograph: invalid
>> soundfont file");
>> + else
>> + msg_Err(p_dec, "failed initializing audiograph (%i)",
>> status);
>> + return VLC_EGENERIC;
>> + }
>> +
>> + // Prepare MIDI soundbank
>> + MusicDeviceMIDIEvent(p_sys->synthUnit,
>> + kMidiMessage_ControlChange,
>> + kMidiMessage_BankMSBControl, 0, 0);
>> +
>> + // Start the AU
>> + status = AUGraphStart(p_sys->graph);
>> + if (unlikely(status != noErr)) {
>> + msg_Err(p_dec, "failed starting audiograph (%i)", status);
>> + return VLC_EGENERIC;
>> + }
>> +
>> + // Set VLC output audio format info
>> + p_dec->fmt_out.i_codec = VLC_CODEC_FL32;
>> + p_dec->fmt_out.audio.i_bitspersample = 32;
>> + p_dec->fmt_out.audio.i_rate = 44100;
>> + p_dec->fmt_out.audio.i_channels = 2;
>> + p_dec->fmt_out.audio.i_physical_channels = AOUT_CHAN_LEFT |
>> AOUT_CHAN_RIGHT;
>> +
>> + // Initialize date (for PTS)
>> + date_Init(&p_sys->end_date, p_dec->fmt_out.audio.i_rate, 1);
>> + date_Set(&p_sys->end_date, 0);
>> +
>> + p_dec->p_sys = p_sys;
>> + p_dec->pf_decode = DecodeBlock;
>> + p_dec->pf_flush = Flush;
>> + return VLC_SUCCESS;
>> +}
>> +
>> +
>> +static void Close (vlc_object_t *p_this)
>> +{
>> + decoder_sys_t *p_sys = ((decoder_t *)p_this)->p_sys;
>> +
>> + if (p_sys->graph) {
>> + AUGraphStop(p_sys->graph);
>> + DisposeAUGraph(p_sys->graph);
>> + }
>> + free(p_sys);
>> +}
>> +
>> +static void Flush (decoder_t *p_dec)
>> +{
>> + decoder_sys_t *p_sys = p_dec->p_sys;
>> +
>> + date_Set(&p_sys->end_date, VLC_TS_INVALID);
>> +
>> + // Turn all sound on all channels off
>> + // else 'old' notes could still be playing
>> + for (unsigned channel = 0; channel < 16; channel++) {
>> + MusicDeviceMIDIEvent(p_sys->synthUnit,
>> kMidiMessage_ControlChange | channel, kMidiController_AllSoundOff, 0,
>> 0);
>> + }
>> +}
>> +
>> +static int DecodeBlock (decoder_t *p_dec, block_t *p_block)
>> +{
>> + decoder_sys_t *p_sys = p_dec->p_sys;
>> + block_t *p_out = NULL;
>> + OSStatus status = noErr;
>> +
>> + if (p_block == NULL) /* No Drain */
>> + return VLCDEC_SUCCESS;
>> +
>> + if (p_block->i_flags &
>> (BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED)) {
>> + Flush(p_dec);
>> + if (p_block->i_flags & BLOCK_FLAG_CORRUPTED) {
>> + block_Release(p_block);
>> + return VLCDEC_SUCCESS;
>> + }
>> + }
>> +
>> + if (p_block->i_pts > VLC_TS_INVALID &&
>> !date_Get(&p_sys->end_date))
>> {
>> + date_Set(&p_sys->end_date, p_block->i_pts);
>> + } else if (p_block->i_pts < date_Get(&p_sys->end_date)) {
>> + msg_Warn(p_dec, "MIDI message in the past?");
>> + goto drop;
>> + }
>> +
>> + if (p_block->i_buffer < 1)
>> + goto drop;
>> +
>> + uint8_t event = p_block->p_buffer[0];
>> + uint8_t data1 = (p_block->i_buffer > 1) ? (p_block->p_buffer[1])
>> :
>> 0;
>> + uint8_t data2 = (p_block->i_buffer > 2) ? (p_block->p_buffer[2])
>> :
>> 0;
>> +
>> + switch (event & 0xF0)
>> + {
>> + case kMidiMessage_NoteOff:
>> + case kMidiMessage_NoteOn:
>> + case kMidiMessage_PolyPressure:
>> + case kMidiMessage_ControlChange:
>> + case kMidiMessage_ProgramChange:
>> + case kMidiMessage_ChannelPressure:
>> + case kMidiMessage_PitchWheel:
>> + MusicDeviceMIDIEvent(p_sys->synthUnit, event, data1,
>> data2,
>> 0);
>> + break;
>> +
>> + case kMidiMessage_SysEx:
>> + // SysEx not handled
>> + break;
>> +
>> + default:
>> + msg_Warn(p_dec, "unhandled MIDI event: %x", event &
>> 0xF0);
>> + break;
>> + }
>> +
>> + // Calculate frame count
>> + // Simplification of 44100 / 1000000
>> + // TODO: Allow other framerates
>> + unsigned frames =
>> + (p_block->i_pts - date_Get(&p_sys->end_date)) * 441 / 10000;
>> +
>> + if (frames == 0)
>> + goto drop;
>> +
>> + if (decoder_UpdateAudioFormat(p_dec))
>> + goto drop;
>
> If dec->fmt_out can be changed while decoding, you should put this
> code
> in the Open() function just after setting fmt_out.
>
>> +
>> + p_out = decoder_NewAudioBuffer(p_dec, frames);
>> + if (p_out == NULL)
>> + goto drop;
>> +
>> + p_out->i_pts = date_Get(&p_sys->end_date );
>> + p_out->i_length = date_Increment(&p_sys->end_date, frames)
>> + - p_out->i_pts;
>> +
>> + // Prepare Timestamp for the AudioUnit render call
>> + AudioTimeStamp timestamp = {};
>> + timestamp.mFlags = kAudioTimeStampWordClockTimeValid;
>> + timestamp.mWordClockTime = p_out->i_pts;
>> +
>> + // Prepare Buffer for the AudioUnit render call
>> + AudioBufferList bufferList;
>> + bufferList.mNumberBuffers = 1;
>> + bufferList.mBuffers[0].mNumberChannels = 2;
>> + bufferList.mBuffers[0].mDataByteSize = frames * sizeof(Float32)
>> * 2;
>> + bufferList.mBuffers[0].mData = p_out->p_buffer;
>> +
>> + status = AudioUnitRender(p_sys->outputUnit,
>> + NULL,
>> + ×tamp, 0,
>> + frames, &bufferList);
>> +
>> + if (status != noErr) {
>> + msg_Warn(p_dec, "rendering audio unit failed! (%i)",
>> status);
>> + block_Release(p_out);
>> + p_out = NULL;
>> + }
>> +
>> +drop:
>> + block_Release(p_block);
>> + if (p_out != NULL)
>> + decoder_QueueAudio(p_dec, p_out);
>> + return VLCDEC_SUCCESS;
>> +}
>> --
>> 2.13.6 (Apple Git-96)
>
> What happen for older ios/macos? Should you check for the presence of
> a
> audiotoolbox symbol in the open function ?
>
Audiotoolbox is ancient, as far as I know all of the functions I am
using
are at least available since OS X 10.5
>>
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