Add makefile for building libvpx for Android.

Android.mk file for using the Android NDK build
system to compile. Adds option for SDK path to
use the compiler that comes with android for testing
compiler compliance.

Change-Id: I5fd17cb76e3ed631758d3f392e62ae1a050d0d10

2 files changed, 241 insertions, 5 deletions

diff --git a/build/make/Android.mk b/build/make/Android.mk
new file mode 100644
index 000000000..9dbbac9b7
--- /dev/null
+++ b/build/make/Android.mk
@@ -0,0 +1,193 @@
+##
+##  Copyright (c) 2012 The WebM project authors. All Rights Reserved.
+##
+##  Use of this source code is governed by a BSD-style license
+##  that can be found in the LICENSE file in the root of the source
+##  tree. An additional intellectual property rights grant can be found
+##  in the file PATENTS.  All contributing project authors may
+##  be found in the AUTHORS file in the root of the source tree.
+##
+
+#
+# This file is to be used for compiling libvpx for Android using the NDK.
+# In an Android project place a libvpx checkout in the jni directory.
+# Run the configure script from the jni directory.  Base libvpx
+# encoder/decoder configuration will look similar to:
+# ./libvpx/configure --target=armv7-android-gcc --disable-examples \
+#                    --sdk-path=/opt/android-ndk-r6b/
+#
+# When targeting Android, realtime-only is enabled by default.  This can
+# be overridden by adding the command line flag:
+#  --disable-realtime-only
+#
+# This will create .mk files that contain variables that contain the
+# source files to compile.
+#
+# Place an Android.mk file in the jni directory that references the
+# Android.mk file in the libvpx directory:
+# LOCAL_PATH := $(call my-dir)
+# include $(CLEAR_VARS)
+# include libvpx/build/make/Android.mk
+#
+# There are currently two TARGET_ARCH_ABI targets for ARM.
+# armeabi and armeabi-v7a.  armeabi-v7a is selected by creating an
+# Application.mk in the jni directory that contains:
+# APP_ABI := armeabi-v7a
+#
+# To change to building armeabi, run ./libvpx/configure again, but with
+# --target=arm5te-android-gcc and and modify the Application.mk file to
+# set APP_ABI := armeabi
+#
+# Running ndk-build will build libvpx and include it in your project.
+#
+
+CONFIG_DIR := $(LOCAL_PATH)
+LIBVPX_PATH := $(LOCAL_PATH)/libvpx
+ASM_CNV_PATH_LOCAL := $(TARGET_ARCH_ABI)/ads2gas
+ASM_CNV_PATH := $(LOCAL_PATH)/$(ASM_CNV_PATH_LOCAL)
+
+# Makefiles created by the libvpx configure process
+# This will need to be fixed to handle x86.
+ifeq ($(TARGET_ARCH_ABI),armeabi-v7a)
+  include $(CONFIG_DIR)/libs-armv7-android-gcc.mk
+else
+  include $(CONFIG_DIR)/libs-armv5te-android-gcc.mk
+endif
+
+# Rule that is normally in Makefile created by libvpx
+# configure.  Used to filter out source files based on configuration.
+enabled=$(filter-out $($(1)-no),$($(1)-yes))
+
+# Override the relative path that is defined by the libvpx
+# configure process
+SRC_PATH_BARE := $(LIBVPX_PATH)
+
+# Include the list of files to be built
+include $(LIBVPX_PATH)/libs.mk
+
+# Want arm, not thumb, optimized
+LOCAL_ARM_MODE := arm
+LOCAL_CFLAGS := -O3
+
+# -----------------------------------------------------------------------------
+# Template  : asm_offsets_template
+# Arguments : 1: assembly offsets file to be created
+#             2: c file to base assembly offsets on
+# Returns   : None
+# Usage     : $(eval $(call asm_offsets_template,<asmfile>, <srcfile>
+# Rationale : Create offsets at compile time using for structures that are
+#             defined in c, but used in assembly functions.
+# -----------------------------------------------------------------------------
+define asm_offsets_template
+
+_SRC:=$(2)
+_OBJ:=$(ASM_CNV_PATH)/$$(notdir $(2)).S
+
+_FLAGS = $$($$(my)CFLAGS) \
+          $$(call get-src-file-target-cflags,$(2)) \
+          $$(call host-c-includes,$$(LOCAL_C_INCLUDES) $$(CONFIG_DIR)) \
+          $$(LOCAL_CFLAGS) \
+          $$(NDK_APP_CFLAGS) \
+          $$(call host-c-includes,$$($(my)C_INCLUDES)) \
+          -DINLINE_ASM \
+          -S \
+
+_TEXT = "Compile $$(call get-src-file-text,$(2))"
+_CC   = $$(TARGET_CC)
+
+$$(eval $$(call ev-build-file))
+
+$(1) : $$(_OBJ) $(2)
+	@mkdir -p $$(dir $$@)
+	@grep -w EQU $$< | tr -d '\#' | $(CONFIG_DIR)/$(ASM_CONVERSION) > $$@
+endef
+
+# Use ads2gas script to convert from RVCT format to GAS format.  This passes
+#  puts the processed file under $(ASM_CNV_PATH).  Local clean rule
+#  to handle removing these
+ASM_CNV_OFFSETS_DEPEND = $(ASM_CNV_PATH)/asm_com_offsets.asm
+ifeq ($(CONFIG_VP8_DECODER), yes)
+  ASM_CNV_OFFSETS_DEPEND += $(ASM_CNV_PATH)/asm_dec_offsets.asm
+endif
+ifeq ($(CONFIG_VP8_ENCODER), yes)
+  ASM_CNV_OFFSETS_DEPEND += $(ASM_CNV_PATH)/asm_enc_offsets.asm
+endif
+
+.PRECIOUS: %.asm.s
+$(ASM_CNV_PATH)/libvpx/%.asm.s: $(LIBVPX_PATH)/%.asm $(ASM_CNV_OFFSETS_DEPEND)
+	@mkdir -p $(dir $@)
+	@$(CONFIG_DIR)/$(ASM_CONVERSION) <$< > $@
+
+
+LOCAL_SRC_FILES += vpx_config.c
+
+# Remove duplicate entries
+CODEC_SRCS_UNIQUE = $(sort $(CODEC_SRCS))
+
+# Pull out C files.  vpx_config.c is in the immediate directory and
+# so it does not need libvpx/ prefixed like the rest of the source files.
+CODEC_SRCS_C = $(filter %.c, $(CODEC_SRCS_UNIQUE))
+LOCAL_CODEC_SRCS_C = $(filter-out vpx_config.c, $(CODEC_SRCS_C))
+
+LOCAL_SRC_FILES += $(foreach file, $(LOCAL_CODEC_SRCS_C), libvpx/$(file))
+
+# Pull out assembly files, splitting NEON from the rest.  This is
+# done to specify that the NEON assembly files use NEON assembler flags.
+CODEC_SRCS_ASM_ALL = $(filter %.asm.s, $(CODEC_SRCS_UNIQUE))
+CODEC_SRCS_ASM = $(foreach v, \
+                 $(CODEC_SRCS_ASM_ALL), \
+                 $(if $(findstring neon,$(v)),,$(v)))
+CODEC_SRCS_ASM_ADS2GAS = $(patsubst %.s, \
+                         $(ASM_CNV_PATH_LOCAL)/libvpx/%.s, \
+                         $(CODEC_SRCS_ASM))
+LOCAL_SRC_FILES += $(CODEC_SRCS_ASM_ADS2GAS)
+
+ifeq ($(TARGET_ARCH_ABI),armeabi-v7a)
+  CODEC_SRCS_ASM_NEON = $(foreach v, \
+                        $(CODEC_SRCS_ASM_ALL),\
+                        $(if $(findstring neon,$(v)),$(v),))
+  CODEC_SRCS_ASM_NEON_ADS2GAS = $(patsubst %.s, \
+                                $(ASM_CNV_PATH_LOCAL)/libvpx/%.s, \
+                                $(CODEC_SRCS_ASM_NEON))
+  LOCAL_SRC_FILES += $(patsubst %.s, \
+                     %.s.neon, \
+                     $(CODEC_SRCS_ASM_NEON_ADS2GAS))
+endif
+
+LOCAL_CFLAGS += \
+    -DHAVE_CONFIG_H=vpx_config.h \
+    -I$(LIBVPX_PATH) \
+    -I$(ASM_CNV_PATH)
+
+LOCAL_MODULE := libvpx
+
+LOCAL_LDLIBS := -llog
+
+LOCAL_STATIC_LIBRARIES := cpufeatures
+
+.PHONY: clean
+clean:
+	@echo "Clean: ads2gas files [$(TARGET_ARCH_ABI)]"
+	@$(RM) $(CODEC_SRCS_ASM_ADS2GAS) $(CODEC_SRCS_ASM_NEON_ADS2GAS)
+	@$(RM) $(patsubst %.asm, %.*, $(ASM_CNV_OFFSETS_DEPEND))
+	@$(RM) -r $(ASM_CNV_PATH)
+
+include $(BUILD_SHARED_LIBRARY)
+
+$(eval $(call asm_offsets_template,\
+    $(ASM_CNV_PATH)/asm_com_offsets.asm, \
+    $(LIBVPX_PATH)/vp8/common/asm_com_offsets.c))
+
+ifeq ($(CONFIG_VP8_DECODER), yes)
+  $(eval $(call asm_offsets_template,\
+    $(ASM_CNV_PATH)/asm_dec_offsets.asm, \
+    $(LIBVPX_PATH)/vp8/decoder/asm_dec_offsets.c))
+endif
+
+ifeq ($(CONFIG_VP8_ENCODER), yes)
+  $(eval $(call asm_offsets_template,\
+    $(ASM_CNV_PATH)/asm_enc_offsets.asm, \
+    $(LIBVPX_PATH)/vp8/encoder/asm_enc_offsets.c))
+endif
+
+$(call import-module,cpufeatures)
diff --git a/build/make/configure.sh b/build/make/configure.sh
index 6039a5066..cbf000b70 100755
--- a/build/make/configure.sh
+++ b/build/make/configure.sh
@@ -477,7 +477,11 @@ process_common_cmdline() {
         --libdir=*)
         libdir="${optval}"
         ;;
-        --libc|--as|--prefix|--libdir)
+        --sdk-path=*)
+        [ -d "${optval}" ] || die "Not a directory: ${optval}"
+        sdk_path="${optval}"
+        ;;
+        --libc|--as|--prefix|--libdir|--sdk-path)
         die "Option ${opt} requires argument"
         ;;
         --help|-h) show_help
@@ -728,8 +732,45 @@ process_common_toolchain() {
             disable multithread
             disable os_support
             ;;
+
+        android*)
+            SDK_PATH=${sdk_path}
+            COMPILER_LOCATION=`find "${SDK_PATH}" \
+                               -name "arm-linux-androideabi-gcc*" -print -quit`
+            TOOLCHAIN_PATH=${COMPILER_LOCATION%/*}/arm-linux-androideabi-
+            CC=${TOOLCHAIN_PATH}gcc
+            AR=${TOOLCHAIN_PATH}ar
+            LD=${TOOLCHAIN_PATH}gcc
+            AS=${TOOLCHAIN_PATH}as
+            STRIP=${TOOLCHAIN_PATH}strip
+            NM=${TOOLCHAIN_PATH}nm
+
+            if [ -z "${alt_libc}" ]; then
+                alt_libc=`find "${SDK_PATH}" -name arch-arm -print | \
+                          awk '{n = split($0,a,"/"); \
+                                split(a[n-1],b,"-"); \
+                                print $0 " " b[2]}' | \
+                          sort -g -k 2 | \
+                          awk '{ print $1 }' | tail -1`
+            fi
+
+            add_cflags "--sysroot=${alt_libc}"
+            add_ldflags "--sysroot=${alt_libc}"
+
+            enable pic
+            soft_enable realtime_only
+            if enabled armv7
+            then
+                enable runtime_cpu_detect
+            fi
+          ;;
+
         darwin*)
-            SDK_PATH=/Developer/Platforms/iPhoneOS.platform/Developer
+            if [ -z "${sdk_path}" ]; then
+                SDK_PATH=/Developer/Platforms/iPhoneOS.platform/Developer
+            else
+                SDK_PATH=${sdk_path}
+            fi
             TOOLCHAIN_PATH=${SDK_PATH}/usr/bin
             CC=${TOOLCHAIN_PATH}/gcc
             AR=${TOOLCHAIN_PATH}/ar
@@ -747,10 +788,11 @@ process_common_toolchain() {
             add_cflags -arch ${tgt_isa}
             add_ldflags -arch_only ${tgt_isa}
 
-            add_cflags  "-isysroot ${SDK_PATH}/SDKs/iPhoneOS5.0.sdk"
+            if [ -z "${alt_libc}" ]; then
+                alt_libc=${SDK_PATH}/SDKs/iPhoneOS5.0.sdk
+            fi
 
-            # This should be overridable
-            alt_libc=${SDK_PATH}/SDKs/iPhoneOS5.0.sdk
+            add_cflags  "-isysroot ${alt_libc}"
 
             # Add the paths for the alternate libc
             for d in usr/include; do
@@ -976,6 +1018,7 @@ EOF
     if enabled multithread; then
         case ${toolchain} in
             *-win*);;
+            *-android-gcc);;
             *) check_header pthread.h && add_extralibs -lpthread
         esac
     fi