shithub: openh264

Download patch

ref: 522639f7682c3a0e5d7cffbb792390281fcd1479
parent: bee0d7d23030ab8c493640bb9fef3d73670f9320
author: Brion Vibber <[email protected]>
date: Thu Jul 2 08:24:32 EDT 2015

Allow compilation to JavaScript via emscripten

Currently the emscripten JavaScript environment for C/C++ programs
cannot do multithreading, and doesn't have a sysctl implementation
to get hardware CPU count. Hardcode to 1.

Using the Linux OS settings works, so not adding a platform file.

To build with emscripten (tested 1.30.0):

  emmake make OS=emscripten ARCH=asmjs

The resulting libopenh264.so is LLVM bitcode which can be further
linked into an emscripten project for final JavaScript output.

--- a/CONTRIBUTORS

+++ b/CONTRIBUTORS

@@ -30,6 +30,7 @@

 Sawyer Shan

 Siping Tao

 Martin Storsjö

+Brion Vibber

 James Wang

 Juanny Wang

 Zhiliang Wang

--- a/codec/common/src/WelsThreadLib.cpp

+++ b/codec/common/src/WelsThreadLib.cpp

@@ -483,6 +483,12 @@

   return WELS_THREAD_ERROR_OK;

+#elif defined(__EMSCRIPTEN__)

+

+  // There is not yet a way to determine CPU count in emscripten JS environment.

+  pInfo->ProcessorCount = 1;

+  return WELS_THREAD_ERROR_OK;

+

 #else

   size_t len = sizeof (pInfo->ProcessorCount);