libvpx: Add VP9 decoder.

source/libvpx/configure

 #!/bin/bash
 ##
 ##  configure
 ##
 ##  This script is the front-end to the build system. It provides a similar
 ##  interface to standard configure scripts with some extra bits for dealing
 ##  with toolchains that differ from the standard POSIX interface and
 ##  for extracting subsets of the source tree. In theory, reusable parts
 ##  of this script were intended to live in build/make/configure.sh,
 ##  but in practice, the line is pretty blurry.
@@ skipping 16 matching lines @@
   --libc=PATH                     path to alternate libc
   --as={yasm|nasm|auto}           use specified assembler [auto, yasm preferred]
   --sdk-path=PATH                 path to root of sdk (iOS, android builds only)
   ${toggle_fast_unaligned}        don't use unaligned accesses, even when
                                   supported by hardware [auto]
   ${toggle_codec_srcs}            in/exclude codec library source code
   ${toggle_debug_libs}            in/exclude debug version of libraries
   ${toggle_md5}                   support for output of checksum data
   ${toggle_static_msvcrt}         use static MSVCRT (VS builds only)
   ${toggle_vp8}                   VP8 codec support
+  ${toggle_vp9}                   VP9 codec support
   ${toggle_internal_stats}        output of encoder internal stats for debug, if supported (encoders)
   ${toggle_mem_tracker}           track memory usage
   ${toggle_postproc}              postprocessing
   ${toggle_multithread}           multithreaded encoding and decoding
   ${toggle_spatial_resampling}    spatial sampling (scaling) support
   ${toggle_realtime_only}         enable this option while building for real-time encoding
   ${toggle_onthefly_bitpacking}   enable on-the-fly bitpacking in real-time encoding
   ${toggle_error_concealment}     enable this option to get a decoder which is able to conceal losses
   ${toggle_runtime_cpu_detect}    runtime cpu detection
   ${toggle_shared}                shared library support
@@ skipping 122 matching lines @@
 enable static
 enable optimizations
 enable fast_unaligned #allow unaligned accesses, if supported by hw
 enable md5
 enable spatial_resampling
 enable multithread
 enable os_support
 enable temporal_denoising
 
 [ -d ${source_path}/../include ] && enable alt_tree_layout
-for d in vp8; do
+for d in vp8 vp9; do
     [ -d ${source_path}/${d} ] && disable alt_tree_layout;
 done
 
 if ! enabled alt_tree_layout; then
 # development environment
 [ -d ${source_path}/vp8 ] && CODECS="${CODECS} vp8_encoder vp8_decoder"
+[ -d ${source_path}/vp9 ] && CODECS="${CODECS} vp9_encoder vp9_decoder"
 else
 # customer environment
 [ -f ${source_path}/../include/vpx/vp8cx.h ] && CODECS="${CODECS} vp8_encoder"
 [ -f ${source_path}/../include/vpx/vp8dx.h ] && CODECS="${CODECS} vp8_decoder"
+[ -f ${source_path}/../include/vpx/vp9cx.h ] && CODECS="${CODECS} vp9_encoder"
+[ -f ${source_path}/../include/vpx/vp9dx.h ] && CODECS="${CODECS} vp9_decoder"
 [ -f ${source_path}/../include/vpx/vp8cx.h ] || disable vp8_encoder
 [ -f ${source_path}/../include/vpx/vp8dx.h ] || disable vp8_decoder
+[ -f ${source_path}/../include/vpx/vp9cx.h ] || disable vp9_encoder
+[ -f ${source_path}/../include/vpx/vp9dx.h ] || disable vp9_decoder
 
 [ -f ${source_path}/../lib/*/*mt.lib ] && soft_enable static_msvcrt
 fi
 
 CODECS="$(echo ${CODECS} | tr ' ' '\n')"
 CODEC_FAMILIES="$(for c in ${CODECS}; do echo ${c%_*}; done | sort | uniq)"
 
 ARCH_LIST="
     arm
     mips
@@ skipping 21 matching lines @@
 "
 HAVE_LIST="
     ${ARCH_EXT_LIST}
     vpx_ports
     stdint_h
     alt_tree_layout
     pthread_h
     sys_mman_h
     unistd_h
 "
+EXPERIMENT_LIST="
+    csm
+    comp_intra_pred
+    superblocks
+    pred_filter
+    lossless
+    subpelrefmv
+    new_mvref
+    implicit_segmentation
+    newbintramodes
+    comp_interintra_pred
+"
 CONFIG_LIST="
     external_build
     install_docs
     install_bins
     install_libs
     install_srcs
     debug
     gprof
     gcov
     rvct
@@ skipping 26 matching lines @@
     onthefly_bitpacking
     error_concealment
     shared
     static
     small
     postproc_visualizer
     os_support
     unit_tests
     multi_res_encoding
     temporal_denoising
+    experimental
+    ${EXPERIMENT_LIST}
 "
 CMDLINE_SELECT="
+    external_build
     extra_warnings
     werror
     install_docs
     install_bins
     install_libs
     install_srcs
     debug
     gprof
     gcov
     pic
@@ skipping 24 matching lines @@
     realtime_only
     onthefly_bitpacking
     error_concealment
     shared
     static
     small
     postproc_visualizer
     unit_tests
     multi_res_encoding
     temporal_denoising
+    experimental
 "
 
 process_cmdline() {
     for opt do
         optval="${opt#*=}"
         case "$opt" in
         --disable-codecs) for c in ${CODECS}; do disable $c; done ;;
+        --enable-?*|--disable-?*)
+        eval `echo "$opt" | sed 's/--/action=/;s/-/ option=/;s/-/_/g'`
+        if echo "${EXPERIMENT_LIST}" | grep "^ *$option\$" >/dev/null; then
+            if enabled experimental; then
+                $action $option
+            else
+                log_echo "Ignoring $opt -- not in experimental mode."
+            fi
+        else
+            process_common_cmdline $opt
+        fi
+        ;;
         *) process_common_cmdline "$opt"
         ;;
         esac
     done
 }
 
 post_process_cmdline() {
     local c
 
     # If the codec family is disabled, disable all components of that family.
@@ skipping 115 matching lines @@
         # here rather than at option parse time because the target auto-detect
         # magic happens after the command line has been parsed.
         if ! enabled linux; then
             if enabled gnu; then
                 echo "--enable-shared is only supported on ELF; assuming this is OK"
             else
                 die "--enable-shared only supported on ELF for now"
             fi
         fi
     fi
-    if [ -z "$CC" ]; then
+    if [ -z "$CC" ] || enabled external_build; then
         echo "Bypassing toolchain for environment detection."
         enable external_build
         check_header() {
             log fake_check_header "$@"
             header=$1
             shift
             var=`echo $header | sed 's/[^A-Za-z0-9_]/_/g'`
             disable $var
+            # Headers common to all environments
             case $header in
                 stdio.h)
                     true;
                 ;;
                 *)
                     local result=false
                     for d in "$@"; do
                         [ -f "${d##-I}/$header" ] && result=true && break
                     done
                     ${result:-true}
             esac && enable $var
+
+            # Specialize windows and POSIX environments.
+            case $toolchain in
+                *-win*-*)
+                    case $header-$toolchain in
+                        stdint*-gcc) true;;
+                        *) false;;
+                    esac && enable $var
+                    ;;
+                *)
+                    case $header in
+                        stdint.h) true;;
+                        pthread.h) true;;
+                        sys/mman.h) true;;
+                        unistd.h) true;;
+                        *) false;;
+                    esac && enable $var
+            esac
+            enabled $var
         }
         check_ld() {
             true
         }
     fi
     check_header stdio.h || die "Unable to invoke compiler: ${CC} ${CFLAGS}"
     check_ld <<EOF || die "Toolchain is unable to link executables"
 int main(void) {return 0;}
 EOF
     # check system headers
     check_header stdint.h
     check_header pthread.h
     check_header sys/mman.h
+    check_header unistd.h # for sysconf(3) and friends.
 
     check_header vpx/vpx_integer.h -I${source_path} && enable vpx_ports
 }
 
 process_toolchain() {
     process_common_toolchain
 
     # Handle universal binaries for this architecture
     case $toolchain in
         universal-darwin*)
@@ skipping 20 matching lines @@
 
     # Enable some useful compiler flags
     if enabled gcc; then
         enabled werror && check_add_cflags -Werror
         check_add_cflags -Wall
         check_add_cflags -Wdeclaration-after-statement
         check_add_cflags -Wdisabled-optimization
         check_add_cflags -Wpointer-arith
         check_add_cflags -Wtype-limits
         check_add_cflags -Wcast-qual
+        check_add_cflags -Wvla
         check_add_cflags -Wimplicit-function-declaration
         check_add_cflags -Wuninitialized
         check_add_cflags -Wunused-variable
         check_add_cflags -Wunused-but-set-variable
         enabled extra_warnings || check_add_cflags -Wno-unused-function
     fi
 
     if enabled icc; then
         enabled werror && check_add_cflags -Werror
         check_add_cflags -Wall
@@ skipping 66 matching lines @@
 ##
 ## END APPLICATION SPECIFIC CONFIGURATION
 ##
 CONFIGURE_ARGS="$@"
 process "$@"
 print_webm_license ${BUILD_PFX}vpx_config.c "/*" " */"
 cat <<EOF >> ${BUILD_PFX}vpx_config.c
 static const char* const cfg = "$CONFIGURE_ARGS";
 const char *vpx_codec_build_config(void) {return cfg;}
 EOF