1# lws minimal raw audio 2 3This demonstrates operating ALSA playback and capture using the lws event loop 4via raw file descriptors. 5 6You need the lws cmake option `-DLWS_WITH_ALSA=1` 7 8This example opens the default ALSA playback and capture devices and pipes the 9capture data into the playback with something over 1s delay via a ringbuffer. 10 11ALSA doesn't really lend itself to direct use with event loops... this example 12uses the capture channel which does create POLLIN normally as the timesource 13for the playback as well; they're both set to 16000Hz sample rate. 14 15## build 16 17``` 18 $ cmake . && make 19``` 20 21## usage 22 23``` 24 $ ./lws-minimal-raw-audio 25[2019/10/14 18:58:49:3288] U: LWS minimal raw audio 26[2019/10/14 18:58:50:3438] N: LWS_CALLBACK_RAW_ADOPT_FILE 27[2019/10/14 18:58:50:3455] N: LWS_CALLBACK_RAW_ADOPT_FILE 28[2019/10/14 18:58:50:4764] N: LWS_CALLBACK_RAW_RX_FILE: 2062 samples 29[2019/10/14 18:58:50:6132] N: LWS_CALLBACK_RAW_RX_FILE: 2205 samples 30[2019/10/14 18:58:50:7592] N: LWS_CALLBACK_RAW_RX_FILE: 2328 samples 31... 32^C[2019/10/14 18:58:56:8460] N: LWS_CALLBACK_RAW_CLOSE_FILE 33[2019/10/14 18:58:56:8461] N: LWS_CALLBACK_RAW_CLOSE_FILE 34[2019/10/14 18:58:56:8461] N: LWS_CALLBACK_PROTOCOL_DESTROY 35$ 36 37``` 38