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obs-filters: Add comments to noise suppression filter

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These comments have been added to clean up the code and make it more
clear of what the code is doing.  The code felt a bit messy, and this
should help prevent the original author of the noise suppression filter
from being lost in case he decides to modify/improve the filter.
This commit is contained in:
jp9000
2016-07-26 05:06:26 -07:00
parent 6fcb5372e9
commit 71dc8d6407
1 changed files with 18 additions and 3 deletions
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plugins/obs-filters/noise-suppress-filter.c
+18 -3
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@@ -206,28 +206,40 @@ static struct obs_audio_data *noise_suppress_filter_audio(void *data,
if (!ng->states[0])
return audio;
/* -----------------------------------------------
* if timestamp has dramatically changed, consider it a new stream of
* audio data. clear all circular buffers to prevent old audio data
* from being processed as part of the new data. */
if (ng->last_timestamp) {
int64_t diff = llabs((int64_t)ng->last_timestamp -
(int64_t)audio->timestamp);
/* if timestamp has dramatically changed, reset audio data */
if (diff > 1000000000LL)
reset_data(ng);
}
ng->last_timestamp = audio->timestamp;
/* -----------------------------------------------
* push audio packet info (timestamp/frame count) to info circlebuf */
info.frames = audio->frames;
info.timestamp = audio->timestamp;
circlebuf_push_back(&ng->info_buffer, &info, sizeof(info));
ng->last_timestamp = audio->timestamp;
/* -----------------------------------------------
* push back current audio data to input circlebuf */
for (size_t i = 0; i < ng->channels; i++)
circlebuf_push_back(&ng->input_buffers[i], audio->data[i],
audio->frames * sizeof(float));
/* -----------------------------------------------
* pop/process each 10ms segments, push back to output circlebuf */
while (ng->input_buffers[0].size >= segment_size)
process(ng);
/* -----------------------------------------------
* peek front of info circlebuf, check to see if we have enough to
* pop the expected packet size, if not, return null */
memset(&info, 0, sizeof(info));
circlebuf_peek_front(&ng->info_buffer, &info, sizeof(info));
out_size = info.frames * sizeof(float);
@@ -235,6 +247,9 @@ static struct obs_audio_data *noise_suppress_filter_audio(void *data,
if (ng->output_buffers[0].size < out_size)
return NULL;
/* -----------------------------------------------
* if there's enough audio data buffered in the output circlebuf,
* pop and return a packet */
circlebuf_pop_front(&ng->info_buffer, NULL, sizeof(info));
da_resize(ng->output_data, out_size * ng->channels);