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https://github.com/obsproject/obs-studio.git
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libobs: Add flag to force source audio to mono
This flag is actually useful under a number of circumstances, and has been requested a number of times.
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c431ac6aa5
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@ -1471,10 +1471,58 @@ static inline void copy_audio_data(obs_source_t *source,
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source->audio_storage_size = size;
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}
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/* TODO: SSE optimization */
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static void downmix_to_mono_planar(struct obs_source *source, uint32_t frames)
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{
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uint32_t channels = get_audio_channels(source->sample_info.speakers);
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const float channels_i = 1.0f / (float)channels;
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float **data = (float**)source->audio_data.data;
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for (uint32_t channel = 1; channel < channels; channel++) {
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for (uint32_t frame = 0; frame < frames; frame++)
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data[0][frame] += data[channel][frame];
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}
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for (uint32_t frame = 0; frame < frames; frame++)
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data[0][frame] *= channels_i;
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for (uint32_t channel = 1; channel < channels; channel++) {
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for (uint32_t frame = 0; frame < frames; frame++)
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data[channel][frame] = data[0][frame];
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}
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}
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static void downmix_to_mono_interleaved(struct obs_source *source,
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uint32_t frames)
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{
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uint32_t channels = get_audio_channels(source->sample_info.speakers);
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const float channels_i = 1.0f / (float)channels;
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float *data = (float*)source->audio_data.data[0];
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for (uint32_t frame = 0; frame < frames; frame++) {
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uint32_t pos = frame * channels;
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for (uint32_t channel = 1; channel < channels; channel++)
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data[pos] += data[pos + channel];
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}
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for (uint32_t frame = 0; frame < frames; frame++)
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data[frame * channels] *= channels_i;
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for (uint32_t frame = 0; frame < frames; frame++) {
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uint32_t pos = frame * channels;
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for (uint32_t channel = 1; channel < channels; channel++)
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data[pos + channel] = data[pos];
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}
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}
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/* resamples/remixes new audio to the designated main audio output format */
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static void process_audio(obs_source_t *source,
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const struct obs_source_audio *audio)
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{
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uint32_t frames = audio->frames;
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if (source->sample_info.samples_per_sec != audio->samples_per_sec ||
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source->sample_info.format != audio->format ||
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source->sample_info.speakers != audio->speakers)
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@ -1485,7 +1533,6 @@ static void process_audio(obs_source_t *source,
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if (source->resampler) {
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uint8_t *output[MAX_AV_PLANES];
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uint32_t frames;
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uint64_t offset;
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memset(output, 0, sizeof(output));
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@ -1500,6 +1547,13 @@ static void process_audio(obs_source_t *source,
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copy_audio_data(source, audio->data, audio->frames,
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audio->timestamp);
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}
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if ((source->flags & OBS_SOURCE_FLAG_FORCE_MONO) != 0) {
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if (is_audio_planar(source->sample_info.format))
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downmix_to_mono_planar(source, frames);
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else
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downmix_to_mono_interleaved(source, frames);
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}
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}
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void obs_source_output_audio(obs_source_t *source,
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@ -753,6 +753,8 @@ EXPORT void obs_source_load(obs_source_t *source);
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/** Specifies that async video frames should be played as soon as possible */
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#define OBS_SOURCE_FLAG_UNBUFFERED (1<<0)
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/** Specifies to force audio to mono */
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#define OBS_SOURCE_FLAG_FORCE_MONO (1<<1)
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/** Sets source flags. Note that these are different from the main output
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* flags. */
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