ao_avfoundation: initial avfoundation ao support

DOCS/man/ao.rst

@@ -138,11 +138,21 @@ Available audio output drivers are:
         passthrough (even if the device reports it as supported). Use with
         extreme care.
 
-
 ``coreaudio_exclusive`` (macOS only)
     Native macOS audio output driver using direct device access and
     exclusive mode (bypasses the sound server).
 
+``avfoundation`` (macOS only)
+    Native macOS audio output driver using ``AVSampleBufferAudioRenderer``
+    in AVFoundation, which supports `spatial audio
+    <https://support.apple.com/en-us/HT211775>`_.
+
+    .. warning::
+
+        Turning on spatial audio may hang the playback
+        if mpv is not started out of the bundle,
+        though playback with spatial audio off always works.
+
 ``openal``
     OpenAL audio output driver.
 

audio/out/ao.c

@@ -40,6 +40,7 @@ extern const struct ao_driver audio_out_audiotrack;
 extern const struct ao_driver audio_out_audiounit;
 extern const struct ao_driver audio_out_coreaudio;
 extern const struct ao_driver audio_out_coreaudio_exclusive;
+extern const struct ao_driver audio_out_avfoundation;
 extern const struct ao_driver audio_out_rsound;
 extern const struct ao_driver audio_out_pipewire;
 extern const struct ao_driver audio_out_sndio;
@@ -65,6 +66,9 @@ static const struct ao_driver * const audio_out_drivers[] = {
 #if HAVE_COREAUDIO
     &audio_out_coreaudio,
 #endif
+#if HAVE_AVFOUNDATION
+    &audio_out_avfoundation,
+#endif
 #if HAVE_PIPEWIRE
     &audio_out_pipewire,
 #endif

audio/out/ao_avfoundation.m

@@ -0,0 +1,358 @@
+/*
+ * 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 "audio/format.h"
+#include "audio/out/ao_coreaudio_chmap.h"
+#include "audio/out/ao_coreaudio_utils.h"
+#include "common/common.h"
+#include "common/msg.h"
+#include "internal.h"
+#include "osdep/timer.h"
+#include "ta/ta_talloc.h"
+
+#import <AVFoundation/AVFoundation.h>
+#import <Foundation/Foundation.h>
+#import <CoreAudioTypes/CoreAudioTypes.h>
+#import <CoreFoundation/CoreFoundation.h>
+#import <CoreMedia/CoreMedia.h>
+
+
+@interface AVObserver : NSObject {
+    struct ao *ao;
+}
+- (void)handleRestartNotification:(NSNotification*)notification;
+@end
+
+struct priv {
+    AVSampleBufferAudioRenderer *renderer;
+    AVSampleBufferRenderSynchronizer *synchronizer;
+    dispatch_queue_t queue;
+    CMAudioFormatDescriptionRef format_description;
+    AVObserver *observer;
+    int64_t end_time_av;
+};
+
+static int64_t CMTimeGetNanoseconds(CMTime time)
+{
+    time = CMTimeConvertScale(time, 1000000000, kCMTimeRoundingMethod_Default);
+    return time.value;
+}
+
+static CMTime CMTimeFromNanoseconds(int64_t time)
+{
+    return CMTimeMake(time, 1000000000);
+}
+
+static void feed(struct ao *ao)
+{
+    struct priv *p = ao->priv;
+    int samplerate = ao->samplerate;
+    int sstride = ao->sstride;
+
+    CMBlockBufferRef block_buffer = NULL;
+    CMSampleBufferRef sample_buffer = NULL;
+    OSStatus err;
+
+    int request_sample_count = samplerate / 10;
+    int buffer_size = request_sample_count * sstride;
+    void *data[] = {CFAllocatorAllocate(NULL, buffer_size, 0)};
+
+    int64_t cur_time_av = CMTimeGetNanoseconds([p->synchronizer currentTime]);
+    int64_t cur_time_mp = mp_time_ns();
+    int64_t end_time_av = MPMAX(p->end_time_av, cur_time_av);
+    int64_t time_delta = CMTimeGetNanoseconds(CMTimeMake(request_sample_count, samplerate));
+    int real_sample_count = ao_read_data_nonblocking(ao, data, request_sample_count, end_time_av - cur_time_av + cur_time_mp + time_delta);
+    if (real_sample_count == 0) {
+        // avoid spinning by blocking the thread
+        mp_sleep_ns(10000000);
+        goto finish;
+    }
+
+    if ((err = CMBlockBufferCreateWithMemoryBlock(
+        NULL,
+        data[0],
+        buffer_size,
+        NULL,
+        NULL,
+        0,
+        real_sample_count * sstride,
+        0,
+        &block_buffer
+    )) != noErr) {
+        MP_FATAL(ao, "failed to create block buffer\n");
+        MP_VERBOSE(ao, "CMBlockBufferCreateWithMemoryBlock returned %d\n", err);
+        goto error;
+    }
+    data[0] = NULL;
+
+    CMSampleTimingInfo sample_timing_into[] = {(CMSampleTimingInfo) {
+        .duration = CMTimeMake(1, samplerate),
+        .presentationTimeStamp = CMTimeFromNanoseconds(end_time_av),
+        .decodeTimeStamp = kCMTimeInvalid
+    }};
+    size_t sample_size_array[] = {sstride};
+    if ((err = CMSampleBufferCreateReady(
+        NULL,
+        block_buffer,
+        p->format_description,
+        real_sample_count,
+        1,
+        sample_timing_into,
+        1,
+        sample_size_array,
+        &sample_buffer
+    )) != noErr) {
+        MP_FATAL(ao, "failed to create sample buffer\n");
+        MP_VERBOSE(ao, "CMSampleBufferCreateReady returned %d\n", err);
+        goto error;
+    }
+
+    [p->renderer enqueueSampleBuffer:sample_buffer];
+
+    time_delta = CMTimeGetNanoseconds(CMTimeMake(real_sample_count, samplerate));
+    p->end_time_av = end_time_av + time_delta;
+
+    goto finish;
+
+error:
+    ao_request_reload(ao);
+finish:
+    if (data[0]) CFAllocatorDeallocate(NULL, data[0]);
+    if (block_buffer) CFRelease(block_buffer);
+    if (sample_buffer) CFRelease(sample_buffer);
+}
+
+static void start(struct ao *ao)
+{
+    struct priv *p = ao->priv;
+
+    p->end_time_av = -1;
+    [p->synchronizer setRate:1];
+    [p->renderer requestMediaDataWhenReadyOnQueue:p->queue usingBlock:^{
+        feed(ao);
+    }];
+}
+
+static void stop(struct ao *ao)
+{
+    struct priv *p = ao->priv;
+
+    dispatch_sync(p->queue, ^{
+        [p->renderer stopRequestingMediaData];
+        [p->renderer flush];
+        [p->synchronizer setRate:0];
+    });
+}
+
+static int control(struct ao *ao, enum aocontrol cmd, void *arg)
+{
+    struct priv *p = ao->priv;
+
+    switch (cmd) {
+    case AOCONTROL_GET_MUTE:
+        *(bool*)arg = [p->renderer isMuted];
+        return CONTROL_OK;
+    case AOCONTROL_GET_VOLUME:
+        *(float*)arg = [p->renderer volume] * 100;
+        return CONTROL_OK;
+    case AOCONTROL_SET_MUTE:
+        [p->renderer setMuted:*(bool*)arg];
+        return CONTROL_OK;
+    case AOCONTROL_SET_VOLUME:
+        [p->renderer setVolume:*(float*)arg / 100];
+        return CONTROL_OK;
+    default:
+        return CONTROL_UNKNOWN;
+    }
+}
+
+@implementation AVObserver
+- (instancetype)initWithAO:(struct ao*)_ao {
+    self = [super init];
+    if (self) {
+        ao = _ao;
+    }
+    return self;
+}
+- (void)handleRestartNotification:(NSNotification*)notification {
+    char *name = cfstr_get_cstr((CFStringRef)notification.name);
+    MP_WARN(ao, "restarting due to system notification; this will cause desync\n");
+    MP_VERBOSE(ao, "notification name: %s\n", name);
+    talloc_free(name);
+    stop(ao);
+    start(ao);
+}
+@end
+
+static int init(struct ao *ao)
+{
+    struct priv *p = ao->priv;
+    AudioChannelLayout *layout = NULL;
+
+#if TARGET_OS_IPHONE
+    AVAudioSession *instance = AVAudioSession.sharedInstance;
+    NSInteger maxChannels = instance.maximumOutputNumberOfChannels;
+    NSInteger prefChannels = MIN(maxChannels, ao->channels.num);
+    [instance setCategory:AVAudioSessionCategoryPlayback error:nil];
+    [instance setMode:AVAudioSessionModeMoviePlayback error:nil];
+    [instance setActive:YES error:nil];
+    [instance setPreferredOutputNumberOfChannels:prefChannels error:nil];
+#endif
+
+    if ((p->renderer = [[AVSampleBufferAudioRenderer alloc] init]) == nil) {
+        MP_FATAL(ao, "failed to create audio renderer\n");
+        MP_VERBOSE(ao, "AVSampleBufferAudioRenderer failed to initialize\n");
+        goto error;
+    }
+    if ((p->synchronizer = [[AVSampleBufferRenderSynchronizer alloc] init]) == nil) {
+        MP_FATAL(ao, "failed to create rendering synchronizer\n");
+        MP_VERBOSE(ao, "AVSampleBufferRenderSynchronizer failed to initialize\n");
+        goto error;
+    }
+    if ((p->queue = dispatch_queue_create(
+        "avfoundation event",
+        dispatch_queue_attr_make_with_qos_class(DISPATCH_QUEUE_SERIAL, QOS_CLASS_USER_INTERACTIVE, 0)
+    )) == NULL) {
+        MP_FATAL(ao, "failed to create dispatch queue\n");
+        MP_VERBOSE(ao, "dispatch_queue_create failed\n");
+        goto error;
+    }
+
+    if (ao->device && ao->device[0]) {
+        [p->renderer setAudioOutputDeviceUniqueID:(NSString*)cfstr_from_cstr(ao->device)];
+    }
+
+    [p->synchronizer addRenderer:p->renderer];
+    if (@available(tvOS 14.5, iOS 14.5, macOS 11.3, *)) {
+        [p->synchronizer setDelaysRateChangeUntilHasSufficientMediaData:NO];
+    }
+
+    if (af_fmt_is_spdif(ao->format)) {
+        MP_FATAL(ao, "avfoundation does not support SPDIF\n");
+#if HAVE_COREAUDIO
+        MP_FATAL(ao, "please use coreaudio_exclusive instead\n");
+#endif
+        goto error;
+    }
+
+    // AVSampleBufferAudioRenderer only supports interleaved formats
+    ao->format = af_fmt_from_planar(ao->format);
+    if (af_fmt_is_planar(ao->format)) {
+        MP_FATAL(ao, "planar audio formats are unsupported\n");
+        goto error;
+    }
+
+    AudioStreamBasicDescription asbd;
+    ca_fill_asbd(ao, &asbd);
+    size_t layout_size = sizeof(AudioChannelLayout)
+                         + (ao->channels.num - 1) * sizeof(AudioChannelDescription);
+    layout = talloc_size(ao, layout_size);
+    layout->mChannelLayoutTag = kAudioChannelLayoutTag_UseChannelDescriptions;
+    layout->mNumberChannelDescriptions = ao->channels.num;
+    for (int i = 0; i < ao->channels.num; ++i) {
+        AudioChannelDescription *desc = layout->mChannelDescriptions + i;
+        desc->mChannelFlags = kAudioChannelFlags_AllOff;
+        desc->mChannelLabel = mp_speaker_id_to_ca_label(ao->channels.speaker[i]);
+    }
+
+    void *talloc_ctx = talloc_new(NULL);
+    AudioChannelLayout *std_layout = ca_find_standard_layout(talloc_ctx, layout);
+    memmove(layout, std_layout, sizeof(AudioChannelLayout));
+    talloc_free(talloc_ctx);
+    ca_log_layout(ao, MSGL_V, layout);
+
+    OSStatus err;
+    if ((err = CMAudioFormatDescriptionCreate(
+        NULL,
+        &asbd,
+        layout_size,
+        layout,
+        0,
+        NULL,
+        NULL,
+        &p->format_description
+    )) != noErr) {
+        MP_FATAL(ao, "failed to create audio format description\n");
+        MP_VERBOSE(ao, "CMAudioFormatDescriptionCreate returned %d\n", err);
+        goto error;
+    }
+    talloc_free(layout);
+    layout = NULL;
+
+    // AVSampleBufferAudioRenderer read ahead aggressively
+    ao->device_buffer = ao->samplerate * 2;
+
+    p->observer = [[AVObserver alloc] initWithAO:ao];
+    NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
+    [center addObserver:p->observer selector:@selector(handleRestartNotification:) name:AVSampleBufferAudioRendererOutputConfigurationDidChangeNotification object:p->renderer];
+    [center addObserver:p->observer selector:@selector(handleRestartNotification:) name:AVSampleBufferAudioRendererWasFlushedAutomaticallyNotification object:p->renderer];
+
+    return CONTROL_OK;
+
+error:
+    talloc_free(layout);
+    if (p->renderer) [p->renderer release];
+    if (p->synchronizer) [p->synchronizer release];
+    if (p->queue) dispatch_release(p->queue);
+    if (p->format_description) CFRelease(p->format_description);
+
+#if TARGET_OS_IPHONE
+    [AVAudioSession.sharedInstance setActive:NO
+        withOptions:AVAudioSessionSetActiveOptionNotifyOthersOnDeactivation
+        error:nil
+    ];
+#endif
+
+    return CONTROL_ERROR;
+}
+
+static void uninit(struct ao *ao)
+{
+    struct priv *p = ao->priv;
+
+    stop(ao);
+
+    [p->renderer release];
+    [p->synchronizer release];
+    dispatch_release(p->queue);
+    CFRelease(p->format_description);
+
+    [[NSNotificationCenter defaultCenter] removeObserver:p->observer];
+    [p->observer release];
+
+#if TARGET_OS_IPHONE
+    [AVAudioSession.sharedInstance setActive:NO
+        withOptions:AVAudioSessionSetActiveOptionNotifyOthersOnDeactivation
+        error:nil
+    ];
+#endif
+}
+
+#define OPT_BASE_STRUCT struct priv
+
+const struct ao_driver audio_out_avfoundation = {
+    .description    = "AVFoundation AVSampleBufferAudioRenderer",
+    .name           = "avfoundation",
+    .uninit         = uninit,
+    .init           = init,
+    .control        = control,
+    .reset          = stop,
+    .start          = start,
+    .list_devs      = ca_get_device_list,
+    .priv_size      = sizeof(struct priv),
+};

audio/out/ao_coreaudio_chmap.c

@@ -22,6 +22,7 @@
 #include "ao_coreaudio_utils.h"
 
 #include "ao_coreaudio_chmap.h"
+#include <CoreAudioTypes/CoreAudioTypes.h>
 
 static const int speaker_map[][2] = {
     { kAudioChannelLabel_Left,                 MP_SPEAKER_ID_FL   },
@@ -65,6 +66,119 @@ static const int speaker_map[][2] = {
     { 0,                                       -1                 },
 };
 
+static const AudioChannelLayoutTag std_layouts[] = {
+    (100U<<16) | 1, // kAudioChannelLayoutTag_Mono
+    (101U<<16) | 2, // kAudioChannelLayoutTag_Stereo
+    (102U<<16) | 2, // kAudioChannelLayoutTag_StereoHeadphones
+    (103U<<16) | 2, // kAudioChannelLayoutTag_MatrixStereo
+    (104U<<16) | 2, // kAudioChannelLayoutTag_MidSide
+    (105U<<16) | 2, // kAudioChannelLayoutTag_XY
+    (106U<<16) | 2, // kAudioChannelLayoutTag_Binaural
+    (107U<<16) | 4, // kAudioChannelLayoutTag_Ambisonic_B_Format
+    (108U<<16) | 4, // kAudioChannelLayoutTag_Quadraphonic
+    (109U<<16) | 5, // kAudioChannelLayoutTag_Pentagonal
+    (110U<<16) | 6, // kAudioChannelLayoutTag_Hexagonal
+    (111U<<16) | 8, // kAudioChannelLayoutTag_Octagonal
+    (112U<<16) | 8, // kAudioChannelLayoutTag_Cube
+    (113U<<16) | 3, // kAudioChannelLayoutTag_MPEG_3_0_A
+    (114U<<16) | 3, // kAudioChannelLayoutTag_MPEG_3_0_B
+    (115U<<16) | 4, // kAudioChannelLayoutTag_MPEG_4_0_A
+    (116U<<16) | 4, // kAudioChannelLayoutTag_MPEG_4_0_B
+    (117U<<16) | 5, // kAudioChannelLayoutTag_MPEG_5_0_A
+    (118U<<16) | 5, // kAudioChannelLayoutTag_MPEG_5_0_B
+    (119U<<16) | 5, // kAudioChannelLayoutTag_MPEG_5_0_C
+    (120U<<16) | 5, // kAudioChannelLayoutTag_MPEG_5_0_D
+    (121U<<16) | 6, // kAudioChannelLayoutTag_MPEG_5_1_A
+    (122U<<16) | 6, // kAudioChannelLayoutTag_MPEG_5_1_B
+    (123U<<16) | 6, // kAudioChannelLayoutTag_MPEG_5_1_C
+    (124U<<16) | 6, // kAudioChannelLayoutTag_MPEG_5_1_D
+    (125U<<16) | 7, // kAudioChannelLayoutTag_MPEG_6_1_A
+    (126U<<16) | 8, // kAudioChannelLayoutTag_MPEG_7_1_A
+    (127U<<16) | 8, // kAudioChannelLayoutTag_MPEG_7_1_B
+    (128U<<16) | 8, // kAudioChannelLayoutTag_MPEG_7_1_C
+    (129U<<16) | 8, // kAudioChannelLayoutTag_Emagic_Default_7_1
+    (130U<<16) | 8, // kAudioChannelLayoutTag_SMPTE_DTV
+    (131U<<16) | 3, // kAudioChannelLayoutTag_ITU_2_1
+    (132U<<16) | 4, // kAudioChannelLayoutTag_ITU_2_2
+    (133U<<16) | 3, // kAudioChannelLayoutTag_DVD_4
+    (134U<<16) | 4, // kAudioChannelLayoutTag_DVD_5
+    (135U<<16) | 5, // kAudioChannelLayoutTag_DVD_6
+    (136U<<16) | 4, // kAudioChannelLayoutTag_DVD_10
+    (137U<<16) | 5, // kAudioChannelLayoutTag_DVD_11
+    (138U<<16) | 5, // kAudioChannelLayoutTag_DVD_18
+    (139U<<16) | 6, // kAudioChannelLayoutTag_AudioUnit_6_0
+    (140U<<16) | 7, // kAudioChannelLayoutTag_AudioUnit_7_0
+    (148U<<16) | 7, // kAudioChannelLayoutTag_AudioUnit_7_0_Front
+    (141U<<16) | 6, // kAudioChannelLayoutTag_AAC_6_0
+    (142U<<16) | 7, // kAudioChannelLayoutTag_AAC_6_1
+    (143U<<16) | 7, // kAudioChannelLayoutTag_AAC_7_0
+    (183U<<16) | 8, // kAudioChannelLayoutTag_AAC_7_1_B
+    (184U<<16) | 8, // kAudioChannelLayoutTag_AAC_7_1_C
+    (144U<<16) | 8, // kAudioChannelLayoutTag_AAC_Octagonal
+    (145U<<16) | 16, // kAudioChannelLayoutTag_TMH_10_2_std
+    (146U<<16) | 21, // kAudioChannelLayoutTag_TMH_10_2_full
+    (149U<<16) | 2, // kAudioChannelLayoutTag_AC3_1_0_1
+    (150U<<16) | 3, // kAudioChannelLayoutTag_AC3_3_0
+    (151U<<16) | 4, // kAudioChannelLayoutTag_AC3_3_1
+    (152U<<16) | 4, // kAudioChannelLayoutTag_AC3_3_0_1
+    (153U<<16) | 4, // kAudioChannelLayoutTag_AC3_2_1_1
+    (154U<<16) | 5, // kAudioChannelLayoutTag_AC3_3_1_1
+    (155U<<16) | 6, // kAudioChannelLayoutTag_EAC_6_0_A
+    (156U<<16) | 7, // kAudioChannelLayoutTag_EAC_7_0_A
+    (157U<<16) | 7, // kAudioChannelLayoutTag_EAC3_6_1_A
+    (158U<<16) | 7, // kAudioChannelLayoutTag_EAC3_6_1_B
+    (159U<<16) | 7, // kAudioChannelLayoutTag_EAC3_6_1_C
+    (160U<<16) | 8, // kAudioChannelLayoutTag_EAC3_7_1_A
+    (161U<<16) | 8, // kAudioChannelLayoutTag_EAC3_7_1_B
+    (162U<<16) | 8, // kAudioChannelLayoutTag_EAC3_7_1_C
+    (163U<<16) | 8, // kAudioChannelLayoutTag_EAC3_7_1_D
+    (164U<<16) | 8, // kAudioChannelLayoutTag_EAC3_7_1_E
+    (165U<<16) | 8, // kAudioChannelLayoutTag_EAC3_7_1_F
+    (166U<<16) | 8, // kAudioChannelLayoutTag_EAC3_7_1_G
+    (167U<<16) | 8, // kAudioChannelLayoutTag_EAC3_7_1_H
+    (168U<<16) | 4, // kAudioChannelLayoutTag_DTS_3_1
+    (169U<<16) | 5, // kAudioChannelLayoutTag_DTS_4_1
+    (170U<<16) | 6, // kAudioChannelLayoutTag_DTS_6_0_A
+    (171U<<16) | 6, // kAudioChannelLayoutTag_DTS_6_0_B
+    (172U<<16) | 6, // kAudioChannelLayoutTag_DTS_6_0_C
+    (173U<<16) | 7, // kAudioChannelLayoutTag_DTS_6_1_A
+    (174U<<16) | 7, // kAudioChannelLayoutTag_DTS_6_1_B
+    (175U<<16) | 7, // kAudioChannelLayoutTag_DTS_6_1_C
+    (176U<<16) | 7, // kAudioChannelLayoutTag_DTS_7_0
+    (177U<<16) | 8, // kAudioChannelLayoutTag_DTS_7_1
+    (178U<<16) | 8, // kAudioChannelLayoutTag_DTS_8_0_A
+    (179U<<16) | 8, // kAudioChannelLayoutTag_DTS_8_0_B
+    (180U<<16) | 9, // kAudioChannelLayoutTag_DTS_8_1_A
+    (181U<<16) | 9, // kAudioChannelLayoutTag_DTS_8_1_B
+    (182U<<16) | 7, // kAudioChannelLayoutTag_DTS_6_1_D
+    (185U<<16) | 4, // kAudioChannelLayoutTag_WAVE_4_0_B
+    (186U<<16) | 5, // kAudioChannelLayoutTag_WAVE_5_0_B
+    (187U<<16) | 6, // kAudioChannelLayoutTag_WAVE_5_1_B
+    (188U<<16) | 7, // kAudioChannelLayoutTag_WAVE_6_1
+    (189U<<16) | 8, // kAudioChannelLayoutTag_WAVE_7_1
+    (194U<<16) | 8, // kAudioChannelLayoutTag_Atmos_5_1_2
+    (195U<<16) | 10, // kAudioChannelLayoutTag_Atmos_5_1_4
+    (196U<<16) | 10, // kAudioChannelLayoutTag_Atmos_7_1_2
+    (192U<<16) | 12, // kAudioChannelLayoutTag_Atmos_7_1_4
+    (193U<<16) | 16, // kAudioChannelLayoutTag_Atmos_9_1_6
+    (197U<<16) | 4, // kAudioChannelLayoutTag_Logic_4_0_C
+    (198U<<16) | 6, // kAudioChannelLayoutTag_Logic_6_0_B
+    (199U<<16) | 7, // kAudioChannelLayoutTag_Logic_6_1_B
+    (200U<<16) | 7, // kAudioChannelLayoutTag_Logic_6_1_D
+    (201U<<16) | 8, // kAudioChannelLayoutTag_Logic_7_1_B
+    (202U<<16) | 12, // kAudioChannelLayoutTag_Logic_Atmos_7_1_4_B
+    (203U<<16) | 14, // kAudioChannelLayoutTag_Logic_Atmos_7_1_6
+    (204U<<16) | 24, // kAudioChannelLayoutTag_CICP_13
+    (205U<<16) | 8, // kAudioChannelLayoutTag_CICP_14
+    (206U<<16) | 12, // kAudioChannelLayoutTag_CICP_15
+    (207U<<16) | 10, // kAudioChannelLayoutTag_CICP_16
+    (208U<<16) | 12, // kAudioChannelLayoutTag_CICP_17
+    (209U<<16) | 14, // kAudioChannelLayoutTag_CICP_18
+    (210U<<16) | 12, // kAudioChannelLayoutTag_CICP_19
+    (211U<<16) | 14, // kAudioChannelLayoutTag_CICP_20
+    kAudioChannelLayoutTag_Unknown
+};
+
 int ca_label_to_mp_speaker_id(AudioChannelLabel label)
 {
     for (int i = 0; speaker_map[i][1] >= 0; i++)
@@ -73,30 +187,48 @@ int ca_label_to_mp_speaker_id(AudioChannelLabel label)
     return -1;
 }
 
+AudioChannelLabel mp_speaker_id_to_ca_label(int speaker_id)
+{
+    for (int i = 0; speaker_map[i][1] >= 0; i++)
+        if (speaker_map[i][1] == speaker_id)
+            return speaker_map[i][0];
+    return -1; // kAudioChannelLabel_Unknown
+}
+
 #if HAVE_COREAUDIO
-static void ca_log_layout(struct ao *ao, int l, AudioChannelLayout *layout)
+void ca_log_layout(struct ao *ao, int l, AudioChannelLayout *layout)
 {
     if (!mp_msg_test(ao->log, l))
         return;
 
-    AudioChannelDescription *descs = layout->mChannelDescriptions;
+    AudioChannelLayoutTag tag = layout->mChannelLayoutTag;
+    mp_msg(ao->log, l, "audio channel layout: tag: <%u>", tag);
 
-    mp_msg(ao->log, l, "layout: tag: <%u>, bitmap: <%u>, "
+    if (tag == kAudioChannelLayoutTag_UseChannelDescriptions) {
-                       "descriptions <%u>\n",
+        AudioChannelDescription *descs = layout->mChannelDescriptions;
-                       (unsigned) layout->mChannelLayoutTag,
+        mp_msg(ao->log, l, ", descriptions <%u>\n",
-                       (unsigned) layout->mChannelBitmap,
+                           (unsigned) layout->mNumberChannelDescriptions);
-                       (unsigned) layout->mNumberChannelDescriptions);
 
-    for (int i = 0; i < layout->mNumberChannelDescriptions; i++) {
+        for (int i = 0; i < layout->mNumberChannelDescriptions; i++) {
-        AudioChannelDescription d = descs[i];
+            AudioChannelDescription d = descs[i];
-        mp_msg(ao->log, l, " - description %d: label <%u, %u>, "
+            mp_msg(ao->log, l, " - description %d: label <%u, %u>,  flags: <%u>",
-            " flags: <%u>, coords: <%f, %f, %f>\n", i,
+                i,
-            (unsigned) d.mChannelLabel,
+                (unsigned) d.mChannelLabel,
-            (unsigned) ca_label_to_mp_speaker_id(d.mChannelLabel),
+                (unsigned) ca_label_to_mp_speaker_id(d.mChannelLabel),
-            (unsigned) d.mChannelFlags,
+                (unsigned) d.mChannelFlags);
-            d.mCoordinates[0],
+            if (d.mChannelFlags != kAudioChannelFlags_AllOff) {
-            d.mCoordinates[1],
+                mp_msg(ao->log, l, ", coords: <%f, %f, %f>\n",
-            d.mCoordinates[2]);
+                    d.mCoordinates[0],
+                    d.mCoordinates[1],
+                    d.mCoordinates[2]);
+            } else {
+                mp_msg(ao->log, l, "\n");
+            }
+        }
+    } else if (tag == kAudioChannelLayoutTag_UseChannelBitmap) {
+        mp_msg(ao->log, l, ", bitmap <%u>\n", layout->mChannelBitmap);
+    } else {
+        mp_msg(ao->log, l, "\n");
     }
 }
 
@@ -117,7 +249,7 @@ static AudioChannelLayout *ca_layout_to_custom_layout(struct ao *ao,
             kAudioFormatProperty_ChannelLayoutForBitmap,
             sizeof(uint32_t), &l->mChannelBitmap, &psize);
         CHECK_CA_ERROR("failed to convert channel bitmap to descriptions (info)");
-        r = talloc_size(NULL, psize);
+        r = talloc_size(talloc_ctx, psize);
         err = AudioFormatGetProperty(
             kAudioFormatProperty_ChannelLayoutForBitmap,
             sizeof(uint32_t), &l->mChannelBitmap, &psize, r);
@@ -127,7 +259,7 @@ static AudioChannelLayout *ca_layout_to_custom_layout(struct ao *ao,
         err = AudioFormatGetPropertyInfo(
             kAudioFormatProperty_ChannelLayoutForTag,
             sizeof(AudioChannelLayoutTag), &l->mChannelLayoutTag, &psize);
-        r = talloc_size(NULL, psize);
+        r = talloc_size(talloc_ctx, psize);
         CHECK_CA_ERROR("failed to convert channel tag to descriptions (info)");
         err = AudioFormatGetProperty(
             kAudioFormatProperty_ChannelLayoutForTag,
@@ -135,14 +267,53 @@ static AudioChannelLayout *ca_layout_to_custom_layout(struct ao *ao,
         CHECK_CA_ERROR("failed to convert channel tag to descriptions (get)");
     }
 
-    MP_VERBOSE(ao, "converted input channel layout:\n");
+    if (ao) {
-    ca_log_layout(ao, MSGL_V, l);
+        MP_VERBOSE(ao, "converted input channel layout:\n");
+        ca_log_layout(ao, MSGL_V, l);
+    }
 
     return r;
 coreaudio_error:
     return NULL;
 }
 
+AudioChannelLayout *ca_find_standard_layout(void *talloc_ctx, AudioChannelLayout *l)
+{
+    if (l->mChannelLayoutTag != kAudioChannelLayoutTag_UseChannelDescriptions)
+        return l;
+
+    AudioChannelLayout *s = talloc_size(talloc_ctx, sizeof(AudioChannelLayout));
+
+    for (int i = 0; ; ++i) {
+        if ((s->mChannelLayoutTag = std_layouts[i]) == kAudioChannelLayoutTag_Unknown) {
+            s = NULL;
+            break;
+        }
+
+        AudioChannelLayout *r = ca_layout_to_custom_layout(NULL, talloc_ctx, s);
+
+        if (!r)
+            goto mismatch;
+        if (l->mNumberChannelDescriptions != r->mNumberChannelDescriptions)
+            goto mismatch;
+
+        for (int i = 0; i < l->mNumberChannelDescriptions; ++i) {
+            AudioChannelDescription *ld = l->mChannelDescriptions + i;
+            AudioChannelDescription *rd = r->mChannelDescriptions + i;
+            if (ld->mChannelLabel == rd->mChannelLabel)
+                continue;
+            // XXX: we cannot handle channels with coordinates
+            goto mismatch;
+        }
+
+        break;
+
+mismatch:;
+    }
+
+    return s ? s : l;
+}
+
 
 #define CHMAP(n, ...) &(struct mp_chmap) MP_CONCAT(MP_CHMAP, n) (__VA_ARGS__)
 

audio/out/ao_coreaudio_chmap.h

@@ -18,15 +18,22 @@
 #ifndef MPV_COREAUDIO_CHMAP_H
 #define MPV_COREAUDIO_CHMAP_H
 
+#include "config.h"
 #include <AudioToolbox/AudioToolbox.h>
 
-#include "config.h"
+#if HAVE_AVFOUNDATION || HAVE_AUDIOUNIT
+#undef HAVE_COREAUDIO
+#define HAVE_COREAUDIO 1
+#endif
 
 struct mp_chmap;
 
 int ca_label_to_mp_speaker_id(AudioChannelLabel label);
+AudioChannelLabel mp_speaker_id_to_ca_label(int speaker_id);
 
 #if HAVE_COREAUDIO
+AudioChannelLayout *ca_find_standard_layout(void *talloc_ctx, AudioChannelLayout *l);
+void ca_log_layout(struct ao *ao, int l, AudioChannelLayout *layout);
 bool ca_init_chmap(struct ao *ao, AudioDeviceID device);
 void ca_get_active_chmap(struct ao *ao, AudioDeviceID device, int channel_count,
                          struct mp_chmap *out_map);

audio/out/ao_coreaudio_properties.h

@@ -23,6 +23,11 @@
 
 #include "internal.h"
 
+#if HAVE_AVFOUNDATION || HAVE_AUDIOUNIT
+#undef HAVE_COREAUDIO
+#define HAVE_COREAUDIO 1
+#endif
+
 // CoreAudio names are way too verbose
 #define ca_sel    AudioObjectPropertySelector
 #define ca_scope  AudioObjectPropertyScope

audio/out/ao_coreaudio_utils.c

@@ -138,7 +138,8 @@ bool check_ca_st(struct ao *ao, int level, OSStatus code, const char *message)
 {
     if (code == noErr) return true;
 
-    mp_msg(ao->log, level, "%s (%s/%d)\n", message, mp_tag_str(code), (int)code);
+    if (ao)
+        mp_msg(ao->log, level, "%s (%s/%d)\n", message, mp_tag_str(code), (int)code);
 
     return false;
 }

audio/out/ao_coreaudio_utils.h

@@ -29,6 +29,11 @@
 #include "internal.h"
 #include "osdep/utils-mac.h"
 
+#if HAVE_AVFOUNDATION || HAVE_AUDIOUNIT
+#undef HAVE_COREAUDIO
+#define HAVE_COREAUDIO 1
+#endif
+
 bool check_ca_st(struct ao *ao, int level, OSStatus code, const char *message);
 
 #define CHECK_CA_ERROR_L(label, message) \

meson.build

@@ -799,6 +799,14 @@ if features['audiounit']
     sources += files('audio/out/ao_audiounit.m')
 endif
 
+avfoundation = dependency('appleframeworks', modules: ['CoreMedia', 'AVFoundation'],
+                          required: get_option('avfoundation'))
+features += {'avfoundation': avfoundation.found()}
+if features['avfoundation']
+    dependencies += avfoundation
+    sources += files('audio/out/ao_avfoundation.m')
+endif
+
 coreaudio = dependency('appleframeworks', modules: ['CoreFoundation', 'CoreAudio',
                        'AudioUnit', 'AudioToolbox'], required: get_option('coreaudio'))
 features += {'coreaudio': coreaudio.found()}
@@ -809,9 +817,10 @@ if features['coreaudio']
                      'audio/out/ao_coreaudio_properties.c')
 endif
 
-if features['audiounit'] or features['coreaudio']
+if features['audiounit'] or features['coreaudio'] or features['avfoundation']
     sources += files('audio/out/ao_coreaudio_chmap.c',
-                     'audio/out/ao_coreaudio_utils.c')
+                     'audio/out/ao_coreaudio_utils.c',
+                     'audio/out/ao_coreaudio_properties.c')
 endif
 
 jack_opt = get_option('jack').require(

meson_options.txt

@@ -43,6 +43,7 @@ option('zlib', type: 'feature', value: 'auto', description: 'zlib')
 option('alsa', type: 'feature', value: 'auto', description: 'ALSA audio output')
 option('audiounit', type: 'feature', value: 'auto', description: 'AudioUnit output (iOS)')
 option('coreaudio', type: 'feature', value: 'auto', description: 'CoreAudio audio output')
+option('avfoundation', type: 'feature', value: 'auto', description: 'AVFoundation audio output')
 option('jack', type: 'feature', value: 'auto', description: 'JACK audio output')
 option('openal', type: 'feature', value: 'disabled', description: 'OpenAL audio output')
 option('opensles', type: 'feature', value: 'auto', description: 'OpenSL ES audio output')