libaom: enable generation of linux/arm-neon config

Use run_perl.py from third_party/libvpx.

Document cmake_update.sh requirements, particularly:
* gcc-arm-linux-gnueabihf
* g++-arm-linux-gnueabihf

Bug: 783519
Change-Id: I091a60cd306e1bea63d4a8ab0b0caacb65ade464
Reviewed-on: https://chromium-review.googlesource.com/1062986
Reviewed-by: Johann Koenig <johannkoenig@google.com>
Commit-Queue: Johann Koenig <johannkoenig@google.com>
Cr-Commit-Position: refs/heads/master@{#559781}

AUTHORS

@@ -195,6 +195,7 @@ David Fox <david@davidjfox.com>
 David Futcher <david.mike.futcher@gmail.com>
 David Leen <davileen@amazon.com>
 David McAllister <mcdavid@amazon.com>
+David Michael Barr <david.barr@samsung.com>
 David Spellman <dspell@amazon.com>
 Dax Kelson <dkelson@gurulabs.com>
 Debashish Samantaray <d.samantaray@samsung.com>

third_party/libaom/BUILD.gn.cmake

@@ -206,7 +206,7 @@ if (enable_av1_decoder) {
 
   if (current_cpu == "arm") {
     if (cpu_arch_full == "arm-neon") {
-      arm_assembly_sources = libaom_srcs_arm_neon_assembly
+      arm_assembly_sources = aom_dsp_common_asm_neon
     } else if (cpu_arch_full == "arm-neon-cpu-detect") {
       arm_assembly_sources = libaom_srcs_arm_neon_cpu_detect_assembly
     } else {
@@ -217,7 +217,7 @@ if (enable_av1_decoder) {
   # Converts ARM assembly files to GAS style.
   if (current_cpu == "arm" && arm_assembly_sources != []) {
     action_foreach("convert_arm_assembly") {
-      script = "//third_party/libaom/run_perl.py"
+      script = "//third_party/libvpx/run_perl.py"
       sources = arm_assembly_sources
       gen_file =
           get_label_info("//third_party/libaom/source/libaom", "root_gen_dir") +
@@ -289,7 +289,17 @@ if (enable_av1_decoder) {
       sources = libaom_srcs_mips
     } else if (current_cpu == "arm") {
       if (arm_use_neon) {
-        sources = libaom_srcs_arm_neon
+        sources = aom_av1_common_sources
+        sources += aom_av1_decoder_sources
+        sources += aom_dsp_common_sources
+        sources += aom_dsp_decoder_sources
+        sources += aom_mem_sources
+        sources += aom_rtcd_sources
+        sources += aom_scale_sources
+        sources += aom_sources
+        sources += aom_util_sources
+        sources += aom_av1_common_intrin_neon
+        sources += aom_dsp_common_intrin_neon
       } else if (is_android) {
         sources = libaom_srcs_arm_neon_cpu_detect
       } else {

third_party/libaom/cmake_update.sh

@@ -12,6 +12,11 @@
 # Usage:
 # $ ./cmake_update.sh
 # Requirements:
+# - cmake3
+# - yasm or nasm
+# Toolchain for armv7:
+#  -gcc-arm-linux-gnueabihf
+#  -g++-arm-linux-gnueabihf
 # 32bit build environment for cmake. Including but potentially not limited to:
 #  -lib32gcc-7-dev
 #  -lib32stdc++-7-dev
@@ -184,4 +189,17 @@ rm "${CFG}/win/x64/aom_config.h.bak"
 egrep "#define [A-Z0-9_]+ [01]" "${CFG}/win/x64/aom_config.h" \
   | awk '{print "%define " $2 " " $3}' > "${CFG}/win/x64/aom_config.asm"
 
+cd ..
+rm -rf "${TMP}"
+mkdir "${TMP}"
+cd "${TMP}"
+
+echo "Generate linux/arm-neon config files."
+gen_config_files linux/arm-neon "${toolchain}/armv7-linux-gcc.cmake ${all_platforms}"
+rm -f "${CFG}/linux/arm-neon"/*
+# mkdir required only for initial commit
+mkdir -p "${CFG}/linux/arm-neon"
+cp aom_config.h aom_config.c aom_config.asm "${CFG}/linux/arm-neon/"
+gen_rtcd_header linux/arm-neon armv7
+
 clean