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/******************************************************************************
Copyright (C) 2023 by Lain Bailey <lain@obsproject.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
******************************************************************************/
#include "obs-browser-source.hpp"
#if CHROME_VERSION_BUILD < 4103
void BrowserSource::EnumAudioStreams(obs_source_enum_proc_t cb, void *param)
{
std::lock_guard<std::mutex> lock(audio_sources_mutex);
for (obs_source_t *audio_source : audio_sources) {
cb(source, audio_source, param);
}
}
static inline void mix_audio(float *__restrict p_out,
const float *__restrict p_in, size_t pos,
size_t count)
{
float *__restrict out = p_out;
const float *__restrict in = p_in + pos;
const float *__restrict end = in + count;
while (in < end)
*out++ += *in++;
}
bool BrowserSource::AudioMix(uint64_t *ts_out,
struct audio_output_data *audio_output,
size_t channels, size_t sample_rate)
{
uint64_t timestamp = 0;
struct obs_source_audio_mix child_audio;
std::lock_guard<std::mutex> lock(audio_sources_mutex);
for (obs_source_t *s : audio_sources) {
if (!obs_source_audio_pending(s)) {
uint64_t source_ts = obs_source_get_audio_timestamp(s);
if (source_ts && (!timestamp || source_ts < timestamp))
timestamp = source_ts;
}
}
if (!timestamp)
return false;
for (obs_source_t *s : audio_sources) {
uint64_t source_ts;
size_t pos, count;
if (obs_source_audio_pending(s)) {
continue;
}
source_ts = obs_source_get_audio_timestamp(s);
if (!source_ts) {
continue;
}
pos = (size_t)ns_to_audio_frames(sample_rate,
source_ts - timestamp);
count = AUDIO_OUTPUT_FRAMES - pos;
obs_source_get_audio_mix(s, &child_audio);
for (size_t ch = 0; ch < channels; ch++) {
float *out = audio_output->data[ch];
float *in = child_audio.output[0].data[ch];
mix_audio(out, in, pos, count);
}
}
*ts_out = timestamp;
return true;
}
#endif
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