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b3131fdfdd
Establish a new distributed CMake architecture with CMake code related to a source directory moving to be in the subdir in its own CMakeLists.txt. In particular, there's now one in ./lib which calls through to ones further down the directory tree like ./lib/plat/xxx, ./lib/roles/xxx etc. This cuts the main CMakelists.txt from 98KB -> 33KB, about a 66% reduction, and it's much easier to maintain sub-CMakeLists.txt that are in the same directory as the sources they manage, and conceal all the details that that level. Child CMakelists.txt become responsible for: - include_directories() definition (this is not supported by CMake directly, it passes it back up via PARENT_SCOPE vars in helper macros) - Addition child CMakeLists.txt inclusion, for example toplevel -> role -> role subdir - Source file addition to the build - Dependent library path resolution... this is now a private thing in the child CMakeLists.txt, it just passes back any adaptations to include_directories() and the LIB_LIST without filling the parent namespace with the details |
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| audio.c | ||
| CMakeLists.txt | ||
| README.md | ||
lws minimal raw audio
This demonstrates operating ALSA playback and capture using the lws event loop via raw file descriptors.
You need the lws cmake option -DLWS_WITH_ALSA=1
This example opens the default ALSA playback and capture devices and pipes the capture data into the playback with something over 1s delay via a ringbuffer.
ALSA doesn't really lend itself to direct use with event loops... this example uses the capture channel which does create POLLIN normally as the timesource for the playback as well; they're both set to 16000Hz sample rate.
build
$ cmake . && make
usage
$ ./lws-minimal-raw-audio
[2019/10/14 18:58:49:3288] U: LWS minimal raw audio
[2019/10/14 18:58:50:3438] N: LWS_CALLBACK_RAW_ADOPT_FILE
[2019/10/14 18:58:50:3455] N: LWS_CALLBACK_RAW_ADOPT_FILE
[2019/10/14 18:58:50:4764] N: LWS_CALLBACK_RAW_RX_FILE: 2062 samples
[2019/10/14 18:58:50:6132] N: LWS_CALLBACK_RAW_RX_FILE: 2205 samples
[2019/10/14 18:58:50:7592] N: LWS_CALLBACK_RAW_RX_FILE: 2328 samples
...
^C[2019/10/14 18:58:56:8460] N: LWS_CALLBACK_RAW_CLOSE_FILE
[2019/10/14 18:58:56:8461] N: LWS_CALLBACK_RAW_CLOSE_FILE
[2019/10/14 18:58:56:8461] N: LWS_CALLBACK_PROTOCOL_DESTROY
$