vector<int32_t> converted_samples = convert_audio_to_fixed32(audio_frame.data + audio_offset, num_samples, audio_format, 2);
lock_guard<mutex> lock(card_mutex);
if (card->new_raw_audio.empty()) {
vector<int32_t> converted_samples = convert_audio_to_fixed32(audio_frame.data + audio_offset, num_samples, audio_format, 2);
lock_guard<mutex> lock(card_mutex);
if (card->new_raw_audio.empty()) {