1 README - 26 January 2017
3 Welcome to the WebM VP8/VP9 Codec SDK!
5 COMPILING THE APPLICATIONS/LIBRARIES:
6 The build system used is similar to autotools. Building generally consists of
7 "configuring" with your desired build options, then using GNU make to build
12 * All x86 targets require the Yasm[1] assembler be installed.
13 * All Windows builds require that Cygwin[2] be installed.
14 * Building the documentation requires Doxygen[3]. If you do not
15 have this package, the install-docs option will be disabled.
16 * Downloading the data for the unit tests requires curl[4] and sha1sum.
17 sha1sum is provided via the GNU coreutils, installed by default on
18 many *nix platforms, as well as MinGW and Cygwin. If coreutils is not
19 available, a compatible version of sha1sum can be built from
20 source[5]. These requirements are optional if not running the unit
23 [1]: http://www.tortall.net/projects/yasm
24 [2]: http://www.cygwin.com
25 [3]: http://www.doxygen.org
26 [4]: http://curl.haxx.se
27 [5]: http://www.microbrew.org/tools/md5sha1sum/
30 Out of tree builds are a supported method of building the application. For
31 an out of tree build, the source tree is kept separate from the object
32 files produced during compilation. For instance:
36 $ ../libvpx/configure <options>
39 3. Configuration options
40 The 'configure' script supports a number of options. The --help option can be
41 used to get a list of supported options:
42 $ ../libvpx/configure --help
45 For cross development, the most notable option is the --target option. The
46 most up-to-date list of supported targets can be found at the bottom of the
47 --help output of the configure script. As of this writing, the list of
79 x86-iphonesimulator-gcc
99 x86_64-iphonesimulator-gcc
111 The generic-gnu target, in conjunction with the CROSS environment variable,
112 can be used to cross compile architectures that aren't explicitly listed, if
113 the toolchain is a cross GNU (gcc/binutils) toolchain. Other POSIX toolchains
114 will likely work as well. For instance, to build using the mipsel-linux-uclibc
115 toolchain, the following command could be used (note, POSIX SH syntax, adapt
116 to your shell as necessary):
118 $ CROSS=mipsel-linux-uclibc- ../libvpx/configure
120 In addition, the executables to be invoked can be overridden by specifying the
121 environment variables: CC, AR, LD, AS, STRIP, NM. Additional flags can be
122 passed to these executables with CFLAGS, LDFLAGS, and ASFLAGS.
124 5. Configuration errors
125 If the configuration step fails, the first step is to look in the error log.
126 This defaults to config.log. This should give a good indication of what went
127 wrong. If not, contact us for support.
129 VP8/VP9 TEST VECTORS:
130 The test vectors can be downloaded and verified using the build system after
131 running configure. To specify an alternate directory the
132 LIBVPX_TEST_DATA_PATH environment variable can be used.
134 $ ./configure --enable-unit-tests
135 $ LIBVPX_TEST_DATA_PATH=../libvpx-test-data make testdata
138 The coding style used by this project is enforced with clang-format using the
139 configuration contained in the .clang-format file in the root of the
142 Before pushing changes for review you can format your code with:
143 # Apply clang-format to modified .c, .h and .cc files
144 $ clang-format -i --style=file \
145 $(git diff --name-only --diff-filter=ACMR '*.[hc]' '*.cc')
147 Check the .clang-format file for the version used to generate it if there is
148 any difference between your local formatting and the review system.
150 See also: http://clang.llvm.org/docs/ClangFormat.html
153 This library is an open source project supported by its community. Please
154 email webm-discuss@webmproject.org for help.