1vpx Multi-Format Codec SDK 2README - 19 May 2010 3 4Welcome to the WebM VP8 Codec SDK! 5 6COMPILING THE APPLICATIONS/LIBRARIES: 7 The build system used is similar to autotools. Building generally consists of 8 "configuring" with your desired build options, then using GNU make to build 9 the application. 10 11 1. Prerequisites 12 13 * All x86 targets require the Yasm[1] assembler be installed. 14 * All Windows builds require that Cygwin[2] be installed. 15 * Building the documentation requires PHP[3] and Doxygen[4]. If you do not 16 have these packages, you must pass --disable-install-docs to the 17 configure script. 18 19 [1]: http://www.tortall.net/projects/yasm 20 [2]: http://www.cygwin.com 21 [3]: http://php.net 22 [4]: http://www.doxygen.org 23 24 2. Out-of-tree builds 25 Out of tree builds are a supported method of building the application. For 26 an out of tree build, the source tree is kept separate from the object 27 files produced during compilation. For instance: 28 29 $ mkdir build 30 $ cd build 31 $ ../libvpx/configure <options> 32 $ make 33 34 3. Configuration options 35 The 'configure' script supports a number of options. The --help option can be 36 used to get a list of supported options: 37 $ ../libvpx/configure --help 38 39 4. Cross development 40 For cross development, the most notable option is the --target option. The 41 most up-to-date list of supported targets can be found at the bottom of the 42 --help output of the configure script. As of this writing, the list of 43 available targets is: 44 45 armv5te-linux-rvct 46 armv5te-linux-gcc 47 armv5te-symbian-gcc 48 armv6-darwin-gcc 49 armv6-linux-rvct 50 armv6-linux-gcc 51 armv6-symbian-gcc 52 iwmmxt-linux-rvct 53 iwmmxt-linux-gcc 54 iwmmxt2-linux-rvct 55 iwmmxt2-linux-gcc 56 armv7-linux-rvct 57 armv7-linux-gcc 58 mips32-linux-gcc 59 ppc32-darwin8-gcc 60 ppc32-darwin9-gcc 61 ppc64-darwin8-gcc 62 ppc64-darwin9-gcc 63 ppc64-linux-gcc 64 x86-darwin8-gcc 65 x86-darwin8-icc 66 x86-darwin9-gcc 67 x86-darwin9-icc 68 x86-linux-gcc 69 x86-linux-icc 70 x86-solaris-gcc 71 x86-win32-vs7 72 x86-win32-vs8 73 x86_64-darwin9-gcc 74 x86_64-linux-gcc 75 x86_64-solaris-gcc 76 x86_64-win64-vs8 77 universal-darwin8-gcc 78 universal-darwin9-gcc 79 generic-gnu 80 81 The generic-gnu target, in conjunction with the CROSS environment variable, 82 can be used to cross compile architectures that aren't explicitly listed, if 83 the toolchain is a cross GNU (gcc/binutils) toolchain. Other POSIX toolchains 84 will likely work as well. For instance, to build using the mipsel-linux-uclibc 85 toolchain, the following command could be used (note, POSIX SH syntax, adapt 86 to your shell as necessary): 87 88 $ CROSS=mipsel-linux-uclibc- ../libvpx/configure 89 90 In addition, the executables to be invoked can be overridden by specifying the 91 environment variables: CC, AR, LD, AS, STRIP, NM. Additional flags can be 92 passed to these executables with CFLAGS, LDFLAGS, and ASFLAGS. 93 94 5. Configuration errors 95 If the configuration step fails, the first step is to look in the error log. 96 This defaults to config.err. This should give a good indication of what went 97 wrong. If not, contact us for support. 98 99SUPPORT 100 This library is an open source project supported by its community. Please 101 please email webm-users@webmproject.org for help. 102 103