mpv/audio/out/ao_audiounit.m

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/*
* This file is part of mpv.
*
* mpv 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.
*
* mpv 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 mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include "ao.h"
#include "internal.h"
#include "audio/format.h"
#include "osdep/timer.h"
#include "options/m_option.h"
#include "common/msg.h"
#include "ao_coreaudio_utils.h"
#include "ao_coreaudio_chmap.h"
#import <AudioUnit/AudioUnit.h>
#import <CoreAudio/CoreAudioTypes.h>
#import <AudioToolbox/AudioToolbox.h>
#import <AVFoundation/AVFoundation.h>
#import <mach/mach_time.h>
struct priv {
AudioUnit audio_unit;
double device_latency;
};
static OSStatus au_get_ary(AudioUnit unit, AudioUnitPropertyID inID, AudioUnitScope inScope, AudioUnitElement inElement, void **data, UInt32 *outDataSize)
{
OSStatus err;
err = AudioUnitGetPropertyInfo(unit, inID, inScope, inElement, outDataSize, NULL);
CHECK_CA_ERROR_SILENT_L(coreaudio_error);
*data = talloc_zero_size(NULL, *outDataSize);
err = AudioUnitGetProperty(unit, inID, inScope, inElement, *data, outDataSize);
CHECK_CA_ERROR_SILENT_L(coreaudio_error_free);
return err;
coreaudio_error_free:
talloc_free(*data);
coreaudio_error:
return err;
}
static AudioChannelLayout *convert_layout(AudioChannelLayout *layout, UInt32* size)
{
AudioChannelLayoutTag tag = layout->mChannelLayoutTag;
AudioChannelLayout *new_layout;
if (tag == kAudioChannelLayoutTag_UseChannelDescriptions)
return layout;
else if (tag == kAudioChannelLayoutTag_UseChannelBitmap)
AudioFormatGetPropertyInfo(kAudioFormatProperty_ChannelLayoutForBitmap,
sizeof(UInt32), &layout->mChannelBitmap, size);
else
AudioFormatGetPropertyInfo(kAudioFormatProperty_ChannelLayoutForTag,
sizeof(AudioChannelLayoutTag), &tag, size);
new_layout = talloc_zero_size(NULL, *size);
if (!new_layout) {
talloc_free(layout);
return NULL;
}
if (tag == kAudioChannelLayoutTag_UseChannelBitmap)
AudioFormatGetProperty(kAudioFormatProperty_ChannelLayoutForBitmap,
sizeof(UInt32), &layout->mChannelBitmap, size, new_layout);
else
AudioFormatGetProperty(kAudioFormatProperty_ChannelLayoutForTag,
sizeof(AudioChannelLayoutTag), &tag, size, new_layout);
new_layout->mChannelLayoutTag = kAudioChannelLayoutTag_UseChannelDescriptions;
talloc_free(layout);
return new_layout;
}
static OSStatus render_cb_lpcm(void *ctx, AudioUnitRenderActionFlags *aflags,
const AudioTimeStamp *ts, UInt32 bus,
UInt32 frames, AudioBufferList *buffer_list)
{
struct ao *ao = ctx;
struct priv *p = ao->priv;
void *planes[MP_NUM_CHANNELS] = {0};
for (int n = 0; n < ao->num_planes; n++)
planes[n] = buffer_list->mBuffers[n].mData;
int64_t end = mp_time_ns();
end += MP_TIME_S_TO_NS(p->device_latency);
end += ca_get_latency(ts) + ca_frames_to_ns(ao, frames);
ao_read_data(ao, planes, frames, end);
return noErr;
}
static bool init_audiounit(struct ao *ao)
{
AudioStreamBasicDescription asbd;
OSStatus err;
uint32_t size;
AudioChannelLayout *layout = NULL;
struct priv *p = ao->priv;
AVAudioSession *instance = AVAudioSession.sharedInstance;
AVAudioSessionPortDescription *port = nil;
NSInteger maxChannels = instance.maximumOutputNumberOfChannels;
NSInteger prefChannels = MIN(maxChannels, ao->channels.num);
MP_VERBOSE(ao, "max channels: %ld, requested: %d\n", maxChannels, (int)ao->channels.num);
[instance setCategory:AVAudioSessionCategoryPlayback error:nil];
[instance setMode:AVAudioSessionModeMoviePlayback error:nil];
[instance setActive:YES error:nil];
[instance setPreferredOutputNumberOfChannels:prefChannels error:nil];
AudioComponentDescription desc = (AudioComponentDescription) {
.componentType = kAudioUnitType_Output,
.componentSubType = kAudioUnitSubType_RemoteIO,
.componentManufacturer = kAudioUnitManufacturer_Apple,
.componentFlags = 0,
.componentFlagsMask = 0,
};
AudioComponent comp = AudioComponentFindNext(NULL, &desc);
if (comp == NULL) {
MP_ERR(ao, "unable to find audio component\n");
goto coreaudio_error;
}
err = AudioComponentInstanceNew(comp, &(p->audio_unit));
CHECK_CA_ERROR("unable to open audio component");
err = AudioUnitInitialize(p->audio_unit);
CHECK_CA_ERROR_L(coreaudio_error_component,
"unable to initialize audio unit");
err = au_get_ary(p->audio_unit, kAudioUnitProperty_AudioChannelLayout, kAudioUnitScope_Output,
0, (void**)&layout, &size);
CHECK_CA_ERROR_L(coreaudio_error_audiounit,
"unable to retrieve audio unit channel layout");
MP_VERBOSE(ao, "AU channel layout tag: %x (%x)\n", layout->mChannelLayoutTag, layout->mChannelBitmap);
layout = convert_layout(layout, &size);
if (!layout) {
MP_ERR(ao, "unable to convert channel layout to list format\n");
goto coreaudio_error_audiounit;
}
for (UInt32 i = 0; i < layout->mNumberChannelDescriptions; i++) {
MP_VERBOSE(ao, "channel map: %i: %u\n", i, layout->mChannelDescriptions[i].mChannelLabel);
}
if (af_fmt_is_spdif(ao->format) || instance.outputNumberOfChannels <= 2) {
ao->channels = (struct mp_chmap)MP_CHMAP_INIT_STEREO;
MP_VERBOSE(ao, "using stereo output\n");
} else {
ao->channels.num = (uint8_t)layout->mNumberChannelDescriptions;
for (UInt32 i = 0; i < layout->mNumberChannelDescriptions; i++) {
ao->channels.speaker[i] =
ca_label_to_mp_speaker_id(layout->mChannelDescriptions[i].mChannelLabel);
}
MP_VERBOSE(ao, "using standard channel mapping\n");
}
ca_fill_asbd(ao, &asbd);
size = sizeof(AudioStreamBasicDescription);
err = AudioUnitSetProperty(p->audio_unit,
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input, 0, &asbd, size);
CHECK_CA_ERROR_L(coreaudio_error_audiounit,
"unable to set the input format on the audio unit");
AURenderCallbackStruct render_cb = (AURenderCallbackStruct) {
.inputProc = render_cb_lpcm,
.inputProcRefCon = ao,
};
err = AudioUnitSetProperty(p->audio_unit,
kAudioUnitProperty_SetRenderCallback,
kAudioUnitScope_Input, 0, &render_cb,
sizeof(AURenderCallbackStruct));
CHECK_CA_ERROR_L(coreaudio_error_audiounit,
"unable to set render callback on audio unit");
talloc_free(layout);
return true;
coreaudio_error_audiounit:
AudioUnitUninitialize(p->audio_unit);
coreaudio_error_component:
AudioComponentInstanceDispose(p->audio_unit);
coreaudio_error:
talloc_free(layout);
return false;
}
static void stop(struct ao *ao)
{
struct priv *p = ao->priv;
OSStatus err = AudioOutputUnitStop(p->audio_unit);
CHECK_CA_WARN("can't stop audio unit");
}
static void start(struct ao *ao)
{
struct priv *p = ao->priv;
AVAudioSession *instance = AVAudioSession.sharedInstance;
p->device_latency = [instance outputLatency];
OSStatus err = AudioOutputUnitStart(p->audio_unit);
CHECK_CA_WARN("can't start audio unit");
}
static void uninit(struct ao *ao)
{
struct priv *p = ao->priv;
AudioOutputUnitStop(p->audio_unit);
AudioUnitUninitialize(p->audio_unit);
AudioComponentInstanceDispose(p->audio_unit);
[AVAudioSession.sharedInstance
setActive:NO
withOptions:AVAudioSessionSetActiveOptionNotifyOthersOnDeactivation
error:nil];
}
static int init(struct ao *ao)
{
if (!init_audiounit(ao))
goto coreaudio_error;
return CONTROL_OK;
coreaudio_error:
return CONTROL_ERROR;
}
#define OPT_BASE_STRUCT struct priv
const struct ao_driver audio_out_audiounit = {
.description = "AudioUnit (iOS)",
.name = "audiounit",
.uninit = uninit,
.init = init,
.reset = stop,
.start = start,
.priv_size = sizeof(struct priv),
};