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win-asio: Add ASIO host for obs-studio #12733

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944c70e
win-asio: Add ASIO source & output
pkviet Oct 27, 2022
6fbedbb
UI: Add ASIO output frontend plugin
pkviet Mar 3, 2024
66f6585
libobs: Add ASIO monitoring track
pkviet Feb 20, 2024
bd21cce
libobs: Audio routing of MONITOR_ONLY sources
pkviet Jan 29, 2026
5536ddf
libobs: Don't silence the extra monitoring track for ASIO
pkviet Dec 10, 2025
245977f
win-asio: Enable monitoring track for output
pkviet Feb 20, 2024
3ed84be
UI: Add to Settings > Audio ASIO monitoring
pkviet May 18, 2025
0108b03
plugins: Enable extra ASIO monitoring track for transitions and slide…
pkviet Jan 16, 2026
f62b2d7
obs-transitions: Set tracks for stinger
pkviet Jan 31, 2026
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2 changes: 2 additions & 0 deletions frontend/data/locale/en-US.ini
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Expand Up @@ -1328,6 +1328,8 @@ Basic.Settings.Advanced.Video.HdrNominalPeakLevel="HDR Nominal Peak Level"
Basic.Settings.Advanced.Audio.MonitoringDevice="Monitoring Device"
Basic.Settings.Advanced.Audio.MonitoringDevice.Default="Default"
Basic.Settings.Advanced.Audio.DisableAudioDucking="Disable Windows audio ducking"
Basic.Settings.Advanced.Audio.AsioMonitoringDevice="ASIO Monitoring Device"
Basic.Settings.Audio.AsioMonitoring="Setup Panel"
Basic.Settings.Advanced.StreamDelay="Stream Delay"
Basic.Settings.Advanced.StreamDelay.Duration="Duration"
Basic.Settings.Advanced.StreamDelay.Preserve="Preserve cutoff point (increase delay) when reconnecting"
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6 changes: 6 additions & 0 deletions frontend/data/themes/Yami.obt
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Expand Up @@ -1477,6 +1477,12 @@ QPushButton::menu-indicator {
right: -2px;
}

QWidget QFormLayout > QToolButton#asioMonitoring {
min-width: 0px;
max-width: 16777215px;
text-align: center;
}

QToolButton {
border: 1px solid var(--button_border);
}
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24 changes: 24 additions & 0 deletions frontend/forms/OBSBasicSettings.ui
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Expand Up @@ -6327,6 +6327,29 @@
</property>
</widget>
</item>
<item row="3" column="0">
<widget class="QLabel" name="asioDeviceLabel">
<property name="text">
<string>Basic.Settings.Advanced.Audio.AsioMonitoringDevice</string>
</property>
<property name="buddy">
<cstring>asioMonitoring</cstring>
</property>
</widget>
</item>
<item row="3" column="1">
<widget class="QToolButton" name="asioMonitoring">
<property name="text">
<string>Basic.Settings.Audio.AsioMonitoring</string>
</property>
<property name="objectName">
<string>asioMonitoring</string>
</property>
<property name="sizePolicy">
<sizepolicy hsizetype="Minimum" vsizetype="Fixed"/>
</property>
</widget>
</item>
</layout>
</widget>
</item>
Expand Down Expand Up @@ -8955,6 +8978,7 @@
<tabstop>meterDecayRate</tabstop>
<tabstop>peakMeterType</tabstop>
<tabstop>monitoringDevice</tabstop>
<tabstop>asioMonitoring</tabstop>
<tabstop>disableAudioDucking</tabstop>
<tabstop>lowLatencyBuffering</tabstop>
<tabstop>baseResolution</tabstop>
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25 changes: 25 additions & 0 deletions frontend/settings/OBSBasicSettings.cpp
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Expand Up @@ -748,6 +748,14 @@ OBSBasicSettings::OBSBasicSettings(QWidget *parent)
FillAudioMonitoringDevices();
}

#ifdef _WIN32
connect(ui->asioMonitoring, &QPushButton::clicked, this, &OBSBasicSettings::AsioMonitoringShow);
ui->asioMonitoring->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed);
ui->formLayout_56->setAlignment(ui->asioMonitoring, Qt::AlignLeft);
#else
ui->asioMonitoring->hide();
ui->asioDeviceLabel->hide();
#endif
connect(ui->channelSetup, &QComboBox::currentIndexChanged, this, &OBSBasicSettings::SurroundWarning);
connect(ui->channelSetup, &QComboBox::currentIndexChanged, this, &OBSBasicSettings::SpeakerLayoutChanged);
connect(ui->lowLatencyBuffering, &QCheckBox::clicked, this, &OBSBasicSettings::LowLatencyBufferingChanged);
Expand Down Expand Up @@ -5545,6 +5553,23 @@ void OBSBasicSettings::SimpleRecordingEncoderChanged()
ui->simpleOutInfoLayout->addWidget(simpleOutRecWarning);
}

#ifdef _WIN32
void OBSBasicSettings::AsioMonitoringShow()
{
QList<QAction *> actions = main->ui->menuTools->actions();
QAction *asioAction = nullptr;
for (QAction *action : actions) {
if (action->objectName() == "asioOutputSetupAction") {
asioAction = action;
break;
}
}
if (asioAction) {
asioAction->trigger();
}
}
#endif

void OBSBasicSettings::SurroundWarning(int idx)
{
if (idx == lastChannelSetupIdx || idx == -1) {
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3 changes: 3 additions & 0 deletions frontend/settings/OBSBasicSettings.hpp
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Expand Up @@ -396,6 +396,9 @@ private slots:
void AudioChanged();
void AudioChangedRestart();
void ReloadAudioSources();
#ifdef _WIN32
void AsioMonitoringShow();
#endif
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pkviet marked this conversation as resolved.
void SurroundWarning(int idx);
void SpeakerLayoutChanged(int idx);
void LowLatencyBufferingChanged(bool checked);
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20 changes: 10 additions & 10 deletions libobs/media-io/audio-io.c
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Expand Up @@ -76,7 +76,7 @@ struct audio_output {
audio_input_callback_t input_cb;
void *input_param;
pthread_mutex_t input_mutex;
struct audio_mix mixes[MAX_AUDIO_MIXES];
struct audio_mix mixes[MAX_AUDIO_MIXES + MAX_AUDIO_MONITORING_MIXES];
};

/* ------------------------------------------------------------------------- */
Expand Down Expand Up @@ -133,7 +133,7 @@ static inline void clamp_audio_output(struct audio_output *audio, size_t bytes)
{
size_t float_size = bytes / sizeof(float);

for (size_t mix_idx = 0; mix_idx < MAX_AUDIO_MIXES; mix_idx++) {
for (size_t mix_idx = 0; mix_idx < (MAX_AUDIO_MIXES + MAX_AUDIO_MONITORING_MIXES); mix_idx++) {
struct audio_mix *mix = &audio->mixes[mix_idx];

/* do not process mixing if a specific mix is inactive */
Expand All @@ -160,7 +160,7 @@ static inline void clamp_audio_output(struct audio_output *audio, size_t bytes)
static void input_and_output(struct audio_output *audio, uint64_t audio_time, uint64_t prev_time)
{
size_t bytes = AUDIO_OUTPUT_FRAMES * audio->block_size;
struct audio_output_data data[MAX_AUDIO_MIXES];
struct audio_output_data data[MAX_AUDIO_MIXES + MAX_AUDIO_MONITORING_MIXES];
uint32_t active_mixes = 0;
uint64_t new_ts = 0;
bool success;
Expand All @@ -173,14 +173,14 @@ static void input_and_output(struct audio_output *audio, uint64_t audio_time, ui

/* get mixers */
pthread_mutex_lock(&audio->input_mutex);
for (size_t i = 0; i < MAX_AUDIO_MIXES; i++) {
for (size_t i = 0; i < (MAX_AUDIO_MIXES + MAX_AUDIO_MONITORING_MIXES); i++) {
if (audio->mixes[i].inputs.num)
active_mixes |= (1 << i);
}
pthread_mutex_unlock(&audio->input_mutex);

/* clear mix buffers */
for (size_t mix_idx = 0; mix_idx < MAX_AUDIO_MIXES; mix_idx++) {
for (size_t mix_idx = 0; mix_idx < (MAX_AUDIO_MIXES + MAX_AUDIO_MONITORING_MIXES); mix_idx++) {
struct audio_mix *mix = &audio->mixes[mix_idx];

memset(mix->buffer, 0, sizeof(mix->buffer));
Expand All @@ -198,7 +198,7 @@ static void input_and_output(struct audio_output *audio, uint64_t audio_time, ui
clamp_audio_output(audio, bytes);

/* output */
for (size_t i = 0; i < MAX_AUDIO_MIXES; i++)
for (size_t i = 0; i < (MAX_AUDIO_MIXES + MAX_AUDIO_MONITORING_MIXES); i++)
do_audio_output(audio, i, new_ts, AUDIO_OUTPUT_FRAMES);
}

Expand Down Expand Up @@ -291,7 +291,7 @@ bool audio_output_connect(audio_t *audio, size_t mi, const struct audio_convert_
{
bool success = false;

if (!audio || mi >= MAX_AUDIO_MIXES)
if (!audio || mi >= (MAX_AUDIO_MIXES + MAX_AUDIO_MONITORING_MIXES))
return false;

pthread_mutex_lock(&audio->input_mutex);
Expand Down Expand Up @@ -330,7 +330,7 @@ bool audio_output_connect(audio_t *audio, size_t mi, const struct audio_convert_

void audio_output_disconnect(audio_t *audio, size_t mix_idx, audio_output_callback_t callback, void *param)
{
if (!audio || mix_idx >= MAX_AUDIO_MIXES)
if (!audio || mix_idx >= (MAX_AUDIO_MIXES + MAX_AUDIO_MONITORING_MIXES))
return;

pthread_mutex_lock(&audio->input_mutex);
Expand Down Expand Up @@ -403,7 +403,7 @@ void audio_output_close(audio_t *audio)
pthread_mutex_destroy(&audio->input_mutex);
}

for (size_t mix_idx = 0; mix_idx < MAX_AUDIO_MIXES; mix_idx++) {
for (size_t mix_idx = 0; mix_idx < (MAX_AUDIO_MIXES + MAX_AUDIO_MONITORING_MIXES); mix_idx++) {
struct audio_mix *mix = &audio->mixes[mix_idx];

for (size_t i = 0; i < mix->inputs.num; i++)
Expand All @@ -424,7 +424,7 @@ bool audio_output_active(const audio_t *audio)
if (!audio)
return false;

for (size_t mix_idx = 0; mix_idx < MAX_AUDIO_MIXES; mix_idx++) {
for (size_t mix_idx = 0; mix_idx < (MAX_AUDIO_MIXES + MAX_AUDIO_MONITORING_MIXES); mix_idx++) {
const struct audio_mix *mix = &audio->mixes[mix_idx];

if (mix->inputs.num != 0)
Expand Down
9 changes: 8 additions & 1 deletion libobs/media-io/audio-io.h
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Expand Up @@ -24,13 +24,20 @@
#ifdef __cplusplus
extern "C" {
#endif
#ifdef _WIN32
// extra track for ASIO monitoring on windows only
#define MAX_AUDIO_MONITORING_MIXES 1
#else
#define MAX_AUDIO_MONITORING_MIXES 0
#endif
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pkviet marked this conversation as resolved.

#define MAX_AUDIO_MIXES 6

#define MAX_AUDIO_CHANNELS 8
#define MAX_DEVICE_INPUT_CHANNELS 64
#define AUDIO_OUTPUT_FRAMES 1024

#define TOTAL_AUDIO_SIZE (MAX_AUDIO_MIXES * MAX_AUDIO_CHANNELS * AUDIO_OUTPUT_FRAMES * sizeof(float))
#define TOTAL_AUDIO_SIZE ((MAX_AUDIO_MIXES + MAX_AUDIO_MONITORING_MIXES) * MAX_AUDIO_CHANNELS * AUDIO_OUTPUT_FRAMES * sizeof(float))

/*
* Base audio output component. Use this to create an audio output track
Expand Down
2 changes: 1 addition & 1 deletion libobs/obs-audio.c
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Expand Up @@ -104,7 +104,7 @@ static inline void mix_audio(struct audio_output_data *mixes, obs_source_t *sour
total_floats -= start_point;
}

for (size_t mix_idx = 0; mix_idx < MAX_AUDIO_MIXES; mix_idx++) {
for (size_t mix_idx = 0; mix_idx < (MAX_AUDIO_MIXES + MAX_AUDIO_MONITORING_MIXES); mix_idx++) {
for (size_t ch = 0; ch < channels; ch++) {
register float *mix = mixes[mix_idx].data[ch];
register float *aud = source->audio_output_buf[mix_idx][ch];
Expand Down
4 changes: 2 additions & 2 deletions libobs/obs-internal.h
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Expand Up @@ -868,7 +868,7 @@ struct obs_source {
struct deque audio_input_buf[MAX_AUDIO_CHANNELS];
size_t last_audio_input_buf_size;
DARRAY(struct audio_action) audio_actions;
float *audio_output_buf[MAX_AUDIO_MIXES][MAX_AUDIO_CHANNELS];
float *audio_output_buf[MAX_AUDIO_MIXES + MAX_AUDIO_MONITORING_MIXES][MAX_AUDIO_CHANNELS];
float *audio_mix_buf[MAX_AUDIO_CHANNELS];
struct resample_info sample_info;
audio_resampler_t *resampler;
Expand Down Expand Up @@ -1257,7 +1257,7 @@ struct obs_output {

struct pause_data pause;

struct deque audio_buffer[MAX_AUDIO_MIXES][MAX_AV_PLANES];
struct deque audio_buffer[MAX_AUDIO_MIXES + MAX_AUDIO_MONITORING_MIXES][MAX_AV_PLANES];
uint64_t audio_start_ts;
uint64_t video_start_ts;
size_t audio_size;
Expand Down
8 changes: 4 additions & 4 deletions libobs/obs-output.c
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Expand Up @@ -269,7 +269,7 @@ static inline void free_packets(struct obs_output *output)

static inline void clear_raw_audio_buffers(obs_output_t *output)
{
for (size_t i = 0; i < MAX_AUDIO_MIXES; i++) {
for (size_t i = 0; i < (MAX_AUDIO_MIXES + MAX_AUDIO_MONITORING_MIXES); i++) {
for (size_t j = 0; j < MAX_AV_PLANES; j++) {
deque_free(&output->audio_buffer[i][j]);
}
Expand Down Expand Up @@ -918,7 +918,7 @@ audio_t *obs_output_audio(const obs_output_t *output)

static inline size_t get_first_mixer(const obs_output_t *output)
{
for (size_t i = 0; i < MAX_AUDIO_MIXES; i++) {
for (size_t i = 0; i < (MAX_AUDIO_MIXES + MAX_AUDIO_MONITORING_MIXES); i++) {
if ((((size_t)1 << i) & output->mixer_mask) != 0) {
return i;
}
Expand Down Expand Up @@ -2448,7 +2448,7 @@ static inline void start_video_encoders(struct obs_output *output, encoded_callb
static inline void start_raw_audio(obs_output_t *output)
{
if (output->info.raw_audio2) {
for (int idx = 0; idx < MAX_AUDIO_MIXES; idx++) {
for (int idx = 0; idx < (MAX_AUDIO_MIXES + MAX_AUDIO_MONITORING_MIXES); idx++) {
if ((output->mixer_mask & ((size_t)1 << idx)) != 0) {
audio_output_connect(output->audio, idx, get_audio_conversion(output),
default_raw_audio_callback, output);
Expand Down Expand Up @@ -2824,7 +2824,7 @@ static inline void stop_video_encoders(obs_output_t *output, encoded_callback_t
static inline void stop_raw_audio(obs_output_t *output)
{
if (output->info.raw_audio2) {
for (int idx = 0; idx < MAX_AUDIO_MIXES; idx++) {
for (int idx = 0; idx < (MAX_AUDIO_MIXES + MAX_AUDIO_MONITORING_MIXES); idx++) {
if ((output->mixer_mask & ((size_t)1 << idx)) != 0) {
audio_output_disconnect(output->audio, idx, default_raw_audio_callback, output);
}
Expand Down
2 changes: 1 addition & 1 deletion libobs/obs-scene.c
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Expand Up @@ -1699,7 +1699,7 @@ static bool scene_audio_render(void *data, uint64_t *ts_out, struct obs_source_a
obs_source_get_audio_mix(source, &child_audio);

if (!source->audio_is_duplicated) {
for (size_t mix = 0; mix < MAX_AUDIO_MIXES; mix++) {
for (size_t mix = 0; mix < (MAX_AUDIO_MIXES + MAX_AUDIO_MONITORING_MIXES); mix++) {
if ((mixers & (1 << mix)) == 0)
continue;

Expand Down
2 changes: 1 addition & 1 deletion libobs/obs-source-transition.c
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Expand Up @@ -889,7 +889,7 @@ static void process_audio(obs_source_t *transition, obs_source_t *child, struct
if (pos > AUDIO_OUTPUT_FRAMES)
return;

for (size_t mix_idx = 0; mix_idx < MAX_AUDIO_MIXES; mix_idx++) {
for (size_t mix_idx = 0; mix_idx < (MAX_AUDIO_MIXES + MAX_AUDIO_MONITORING_MIXES); mix_idx++) {
struct audio_output_data *output = &audio->output[mix_idx];
struct audio_output_data *input = &child_audio.output[mix_idx];

Expand Down
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