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Add custom audio track selection (pick any subset of tracks 1-6) #185

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Add custom audio track selection (pick any subset of tracks 1-6) #185

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e015d67
Add custom audio track selection (pick any subset of tracks 1-6)
ilyambr Jul 22, 2026
b49f12b
Name custom audio tracks 'Track N' in the output file instead of leav…
ilyambr Aug 1, 2026
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1 change: 1 addition & 0 deletions data/locale/en-US.ini
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,7 @@ SourceRecordEnable="Source Record Enable"
SourceRecordDisable="Source Record Disable"
AudioTrack="Audio Track"
Track="Track"
Custom="Custom"
Background="Background"
BackgroundColor="Background Color"
MaxSeconds="Maximum Seconds"
Expand Down
71 changes: 65 additions & 6 deletions source-record.c
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,8 @@
#define OUTPUT_MODE_STREAMING_OR_RECORDING 4
#define OUTPUT_MODE_VIRTUAL_CAMERA 5

#define AUDIO_TRACK_CUSTOM -2

#define BACKGROUND_CHANNEL 0
#define SOURCE_CHANNEL 1

Expand Down Expand Up @@ -48,6 +50,7 @@ struct source_record_filter_context {
obs_hotkey_id splitHotkey;
obs_hotkey_id chapterHotkey;
int audio_track;
uint32_t audio_track_mask;
obs_weak_source_t *audio_source;
bool closing;
bool exiting;
Expand Down Expand Up @@ -747,6 +750,18 @@ static void set_encoder_defaults(obs_data_t *settings)
}
}

static uint32_t get_audio_track_mask(obs_data_t *settings)
{
uint32_t mask = 0;
char name[16];
for (int i = 0; i < MAX_AUDIO_MIXES; i++) {
snprintf(name, sizeof(name), "audio_track_%d", i + 1);
if (obs_data_get_bool(settings, name))
mask |= (1u << i);
}
return mask;
}

static void update_encoder(struct source_record_filter_context *filter, obs_data_t *settings)
{
const char *enc_id = get_encoder_id(settings);
Expand Down Expand Up @@ -792,13 +807,17 @@ static void update_encoder(struct source_record_filter_context *filter, obs_data
obs_encoder_update(filter->encoder, settings);
}
const int audio_track = obs_data_get_bool(settings, "different_audio") ? (int)obs_data_get_int(settings, "audio_track") : 0;
const uint32_t audio_track_mask = audio_track == AUDIO_TRACK_CUSTOM ? get_audio_track_mask(settings) : 0;
const bool uses_master_audio = audio_track > 0 || audio_track == -1 || audio_track == AUDIO_TRACK_CUSTOM;
const bool used_master_audio =
filter->audio_track > 0 || filter->audio_track == -1 || filter->audio_track == AUDIO_TRACK_CUSTOM;
if (filter->closing) {
if (filter->audio_track == 0 && filter->audio_output) {
if (!used_master_audio && filter->audio_output) {
audio_output_close(filter->audio_output);
filter->audio_output = NULL;
}
} else if (!filter->audio_output) {
if (audio_track > 0 || audio_track == -1) {
if (uses_master_audio) {
filter->audio_output = obs_get_audio();
} else {
struct audio_output_info oi = {0};
Expand All @@ -810,10 +829,10 @@ static void update_encoder(struct source_record_filter_context *filter, obs_data
oi.input_callback = audio_input_callback;
audio_output_open(&filter->audio_output, &oi);
}
} else if (audio_track > 0 && filter->audio_track == 0) {
} else if (uses_master_audio && !used_master_audio) {
audio_output_close(filter->audio_output);
filter->audio_output = obs_get_audio();
} else if (audio_track == 0 && filter->audio_track > 0) {
} else if (!uses_master_audio && used_master_audio) {
filter->audio_output = NULL;
struct audio_output_info oi = {0};
oi.name = obs_source_get_name(filter->source);
Expand All @@ -825,7 +844,8 @@ static void update_encoder(struct source_record_filter_context *filter, obs_data
audio_output_open(&filter->audio_output, &oi);
}

if (!filter->audioEncoder[0] || filter->audio_track != audio_track) {
if (!filter->audioEncoder[0] || filter->audio_track != audio_track ||
(audio_track == AUDIO_TRACK_CUSTOM && filter->audio_track_mask != audio_track_mask)) {
for (int i = 0; i < MAX_AUDIO_MIXES; i++) {
if (!filter->audioEncoder[i])
continue;
Expand All @@ -847,10 +867,22 @@ static void update_encoder(struct source_record_filter_context *filter, obs_data
struct dstr name;
dstr_init(&name);
for (int i = 0; i < MAX_AUDIO_MIXES; i++) {
dstr_printf(&name, "%s track %d", obs_source_get_name(filter->source), i + 1);
dstr_printf(&name, "%s %d", obs_module_text("Track"), i + 1);
filter->audioEncoder[i] = obs_audio_encoder_create(enc_id, name.array, audio_settings, i, NULL);
}
dstr_free(&name);
} else if (audio_track == AUDIO_TRACK_CUSTOM) {
struct dstr name;
dstr_init(&name);
int out_idx = 0;
for (int i = 0; i < MAX_AUDIO_MIXES; i++) {
if ((audio_track_mask & (1u << i)) == 0)
continue;
dstr_printf(&name, "%s %d", obs_module_text("Track"), i + 1);
filter->audioEncoder[out_idx] = obs_audio_encoder_create(enc_id, name.array, audio_settings, i, NULL);
out_idx++;
}
dstr_free(&name);
} else {
filter->audioEncoder[0] =
obs_audio_encoder_create(enc_id, obs_source_get_name(filter->source), audio_settings, 0, NULL);
Expand All @@ -869,6 +901,7 @@ static void update_encoder(struct source_record_filter_context *filter, obs_data
}
}
filter->audio_track = audio_track;
filter->audio_track_mask = audio_track_mask;
}

static void source_record_filter_update(void *data, obs_data_t *settings)
Expand Down Expand Up @@ -1621,6 +1654,21 @@ static bool encoder_changed(void *data, obs_properties_t *props, obs_property_t
return true;
}

static bool audio_track_changed(void *data, obs_properties_t *props, obs_property_t *property, obs_data_t *settings)
{
UNUSED_PARAMETER(data);
UNUSED_PARAMETER(property);
const bool custom = obs_data_get_int(settings, "audio_track") == AUDIO_TRACK_CUSTOM;
char prop_name[16];
for (int i = 1; i <= MAX_AUDIO_MIXES; i++) {
snprintf(prop_name, sizeof(prop_name), "audio_track_%d", i);
obs_property_t *track_check = obs_properties_get(props, prop_name);
if (track_check)
obs_property_set_visible(track_check, custom);
}
return true;
}

static bool list_add_audio_sources(void *data, obs_source_t *source)
{
obs_property_t *p = data;
Expand Down Expand Up @@ -1751,6 +1799,17 @@ static obs_properties_t *source_record_filter_properties(void *data)
snprintf(buffer, 64, "%s %i", track, i);
obs_property_list_add_int(p, buffer, i);
}
obs_property_list_add_int(p, obs_module_text("Custom"), AUDIO_TRACK_CUSTOM);
obs_property_set_modified_callback2(p, audio_track_changed, data);

for (int i = 1; i <= MAX_AUDIO_MIXES; i++) {
char prop_name[16];
snprintf(prop_name, sizeof(prop_name), "audio_track_%d", i);
char buffer[64];
snprintf(buffer, 64, "%s %i", track, i);
obs_property_t *track_check = obs_properties_add_bool(audio, prop_name, buffer);
obs_property_set_visible(track_check, false);
}

p = obs_properties_add_list(audio, "audio_source", obs_module_text("Source"), OBS_COMBO_TYPE_EDITABLE,
OBS_COMBO_FORMAT_STRING);
Expand Down