ffmpeg移植Android方法以及常見(jiàn)問(wèn)題匯總

1、ffmpeg移植Android方法以及常見(jiàn)問(wèn)題匯總：在ffmpeg官網(wǎng)下載源碼包，比如ffmpeg-2.3。在ffmpeg目錄下增加Android.mk和av.mkconfig.sh三個(gè)文件。config.sh用于配置ffmpeg環(huán)境腳本，可鍵入#!/bin/shPREBUILT=.android-ndk-r7b/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86PLATFORM=.android-ndk-r7b/platforms/android-14/arch-armexportTMPDIR=./tmp./configure-

2、target-os=linux-arch=arm-enable-cross-compile-cc=$PREBUILT/bin/arm-linux-androideabi-gcc-4.4.3-cross-prefix=$PREBUILT/bin/arm-linux-androideabi-nm=$PREBUILT/bin/arm-linux-androideabi-nm-extra-cflags=-fPIC-DANDROID-enable-static-disable-shared-disable-asm-disable-yasm-extra-ldflags=-Wl,-T,$PREBUILT/a

3、rm-linux-androideabi/lib/ldscripts/armelf_linux_eabi.x-Wl,-rpath-link=$PLATFORM/usr/lib-L$PLATFORM/usr/lib-nostdlib$PREBUILT/lib/gcc/arm-linux-androideabi/4.4.3/crtbegin.o$PREBUILT/lib/gcc/arm-linux-androideabi/4.4.3/crtend.o-lc-lm-ldlPREBUILT、PLATFORM、TMPDIR是需要修改的，配置自己的ndk路徑，通常這一步出錯(cuò)概率極高。TMPDIR路徑一定要

4、存在且可以訪問(wèn)。常見(jiàn)錯(cuò)誤：armlinuxandroideabigccisunabletocreateanexecutablefile，000tmp文件沒(méi)有設(shè)置。UnknownCcompiler/toolchains/armlinuxandroideabi4.4.3/prebuilt/windows/bin/armlinuxandroideabigcc,000NDK配置錯(cuò)誤。./config.sh:line8:arch:commandnotfound,./configure每一個(gè)參數(shù)后的轉(zhuǎn)行符號(hào)，注意后面不要有空格符，另外也有可能是字符格式錯(cuò)誤，要轉(zhuǎn)為unix,在vim里:setff二unix

5、保存退出。否則腳本執(zhí)行失敗。cc、一crossprefix、一nm、一extraldflags注意配置路徑要正確，否則腳本執(zhí)行失敗。./configure是配置ffmpeg選項(xiàng)的，可以按個(gè)人需求添加刪減，不贅述。執(zhí)行該腳本，如果正確，大約數(shù)分鐘后執(zhí)行結(jié)束，會(huì)自動(dòng)生成config.h和config.mak。如果執(zhí)行出錯(cuò)，一般是配置問(wèn)題。av.mk文件鍵入include$(LOCAL_PATH)/./config.makOBJS:=OBJS-yes:=MMX-OBJS-yes:=include$(LOCAL_PATH)/Makefile#collectobjectsOBJS-$(HAVE_MMX)

6、+=$(MMX-OBJS-yes)OBJS+=$(OBJS-yes)FFNAME:=lib$(NAME)FFLIBS:=$(foreach,NAME,$(FFLIBS),lib$(NAME)FFCFLAGS=-DHAVE_AV_CONFIG_H-Wno-sign-compare-Wno-switch-Wno-pointer-signFFCFLAGS+=-DTARGET_CONFIG=config-$(TARGET_ARCH).hALL_S_FILES:=$(wildcard$(LOCAL_PATH)/$(TARGET_ARCH)/*.S)ALL_S_FILES:=$(addprefix$(TA

7、RGET_ARCH)/,$(notdir$(ALL_S_FILES)ifneq($(ALL_S_FILES),)ALL_S_OBJS:=$(patsubst%.S,%.o,$(ALL_S_FILES)C_OBJS:=$(filter-out$(ALL_S_OBJS),$(OBJS)S_OBJS:=$(filter$(ALL_S_OBJS),$(OBJS)elseC_OBJS:=$(OBJS)S_OBJS:=endifC_FILES:=$(patsubst%.o,%.c,$(C_OBJS)S_FILES:=$(patsubst%.o,%.S,$(S_OBJS)FFFILES:=$(sort$(S

8、_FILES)$(sort$(C_FILES)即可。在需要編譯的目錄(不同版本ffmpeg有區(qū)別)，比如在libavcodec、ibavdevice、libavfilter、libavformat、libavutil、libpostproc、libswscale、libswresample目錄下分別放入一個(gè)Android.mk別放入一個(gè)Android.mk文件，鍵入LOCAL_PATH:=$(callmy-dir)include$(CLEAR_VARS)include$(LOCAL_PATH)/./av.mkLOCAL_SRC_FILES:=$(FFFILES)LOCAL_C_INCLUDES

9、:=$(LOCAL_PATH)$(LOCAL_PATH)/.LOCAL_CFLAGS+=$(FFCFLAGS)LOCAL_STATIC_LIBRARIES:=$(FFLIBS)LOCAL_MODULE:=$(FFNAME)include$(BUILD_STATIC_LIBRARY)即可，這幾個(gè)目錄下的Android.mk是一樣的。也可以自己配置L0CAL_M0DULE和L0CAL_STATIC_LIBRARIES,不過(guò)上述腳本配置簡(jiǎn)單。然后刪除libavcodec、ibavdevice、libavfilter、libavformat、libavutil、libpostproc、libswsca

10、le、libswresample目錄下的Makefile中的include$(SUBDIR)./config.mak和include$(SUBDIR)./subdir.mak，后者在2.3版本中并不存在，確保自己的Makefile000D2句就可以了。5.編寫(xiě)Android.mk，放置ffmpeg根目錄，即av.mk、config.sh同級(jí)目錄這里有2個(gè)，一個(gè)是用于編譯libffmpeg.so的腳本，如下：L0CAL_PATH:=$(callmy-dir)include$(CLEAR_VARS)L0CAL_STATIC_LIBRARIES:=libavformatlibavcodeclibav

11、utillibpostproclibswscalelibavfilterlibavdeviceL0CAL_M0DULE_TAGS:=optionalL0CAL_M0DULE:=libffmpeginclude$(BUILD_SHARED_LIBRARY)include$(callall-makefiles-under,$(L0CAL_PATH)也可以寫(xiě)一個(gè)生產(chǎn)ffmpeg的執(zhí)行文件的mk腳本：L0CAL_PATH:=$(callmy-dir)include$(CLEAR_VARS)LOCAL_MODULE_TAGS:=optionalLOCAL_PRELINK_MODULE:=falseLOC

12、AL_SRC_FILES:=cmdutils.cffmpeg.cffmpeg_opt.cffmpeg_filter.cLOCAL_SHARED_LIBRARIES:=libffmpegLOCAL_MODULE:=ffmpeg#include$(BUILD_SHARED_LIBRARY)include$(BUILD_EXECUTABLE)include$(callall-makefiles-under,$(LOCAL_PATH)cmdutils.c和ffmpeg.c,編譯后其中，LOCAL_SRC_FILEScmdutils.c和ffmpeg.c,編譯后6.常用的移植修改和編譯報(bào)錯(cuò)因?yàn)槭且浦?，?/p>

13、以有些文件必須修改才能編譯通過(guò)，對(duì)config.h修改：老的ffmpeg是將#definerestrictrestrict改為#definerestrict新版本是#defineav_restrictav_restrict改為#defineav_restrict將ffmpeg/libavutil/libm.h中所有static的函數(shù)刪除。然后編譯，如果報(bào)錯(cuò)/works/workspace/android-console/jni/ffmpeg.c:3636:19:error:storagesizeofrusageisntknown/works/workspace/android-console/

14、jni/ffmpeg.c:3638:15:error:RUSAGE_SELFundeclared(firstuseinthisfunction)將config.h中#defineHAVE_GETRUSAGE1修改為#defineHAVE_GETRUSAGE0報(bào)錯(cuò)/works/workspace/android-console/jni/cmdutils.c:270:19:error:storagesizeofrlisntknown/works/workspace/android-console/jni/cmdutils.c:271:19:error:RLIMIT_CPUundeclared(fi

15、rstuseinthisfunction)將config.h中#defineHAVE_SETRLIMIT1修改為#defineHAVE_SETRLIMIT0報(bào)錯(cuò)/works/workspace/android-console/jni/cmdutils.c:41:21:fatalerror:version.h:Nosuchfileordirectory在在ffmpeg根目錄下運(yùn)行./version.sh.version.h報(bào)錯(cuò)android-ndk-r8d/build/core/build-binary.mk:41:*targetfilecleanhasboth:and:entries.Stop.把libavfilter目錄中的Makefile末尾的clean命令注釋掉報(bào)錯(cuò)./platforms/android-18/arch-arm/usr/include/stdlib.h:54:14:error:expectedidentifieror(beforevoid./platforms/android-18/arch-arm/usr/inc