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openmax-hacks

Clone of webrtc OpenMAX DL

This is a clone of WebRTC's OpenMAX DL for personal hacking. No guarantees that this is up-to-date or even compatible with WebRTC's version.

How to Use

While the code can be used independently, this repo assumes that it is checked out inside a Chromium tree. In particular it should be cloned in the third_party directory.

Thus

cd $CHROMIUM/src/third_party
mv openmax_dl openmax_dl-save
git clone https://github.com/rtoy/openmax-hacks.git openmax_dl

Moving openmax_dl directory out of the way isn't ideal, but for now, this is the easiest way to get things going

Building

Use

cd $CHROMIUM/src
# Fill in gn args
# I'm using
# target_os = "android"
# target_cpu = "arm"
# is_debug = false
gn args out/Release
ninja -C out/Release test_float_fft test_float_rfft test_fft_time

This creates timing tests for the OpenMAX DL routines. You can add the following flags to the gyp_chromium command line to enable tests with other FFTs:

(Not all platforms support all of these options, but these should all work on an arm7 with NEON.)

Other useful options:

  • target_arch=arm64 to create an arm64 build. (Default is arm.)
  • -Dne10_arm64_inline_asm enables inline assembly for Ne10 arm64 builds.

Instead of test_fft_time.gyp, you can also use test_fft.gyp. The difference is that test_fft_time.gyp builds test_fft_time to do timing tests for various FFTs. test_fft.gyp builds a set of test programs for testing the FFTs available in OpenMAX DL.

Running

Once test_fft_time has been built, you can run it on an Android device as follows:

adb push out/Release/test_fft_time /data/local/tmp
adb shell /data/local/tmp/test_fft_time -h

where directory /data/local/tmp seems like a general available suitable directory that can be used for installing the executable. If this doesn't work, find some other directory, or maybe try adb root first.

The -h option prints out a help message. Choose the appropriate set of options for the test that you want to run. In particular -v0 produces a brief output that is suitable for pasting into a spreadsheet. Large values for -v will produce increasingly verbose output that might be useful for debugging.