how to compile ffmpeg with neon support?

[smallrui]

hi,
how to compile ffmpeg with neon support?

[Zoran Angelov]

You can try with this one http://bambuser.com/opensource but you need to manually add features as you need because by default there is very few enabled. Look inside the build.sh there is armv6, armv7a and armv7a+neon configure arguments. I'm using armv6 only, have not tried to build armv7a+neon yet.

On Wed, Sep 7, 2011 at 9:16 AM, smallrui <isma...@gmail.com> wrote:

hi,
how to compile ffmpeg with neon support?

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[smallrui]

hi, thanks for your reply.

when i compile follow your suggestion.but it cause an error.

Compile thumb : avcodec <= dsputil.c
/tmp/ccQYYjME.s: Assembler messages:
/tmp/ccQYYjME.s:24484: Error: thumb conditional instruction not in IT
block
/tmp/ccQYYjME.s:24485: Error: thumb conditional instruction not in IT
block
/tmp/ccQYYjME.s:24487: Error: thumb conditional instruction not in IT
block
/tmp/ccQYYjME.s:24489: Error: thumb conditional instruction not in IT
block
/tmp/ccQYYjME.s:24581: Error: thumb conditional instruction not in IT
block
/tmp/ccQYYjME.s:24582: Error: thumb conditional instruction not in IT
block
/tmp/ccQYYjME.s:24584: Error: thumb conditional instruction not in IT
block
/tmp/ccQYYjME.s:24586: Error: thumb conditional instruction not in IT
block

i found that says theirs seems have a bug in dsputil.c, but i am not
very confirm
whether their is a bug and how to solve the bug.
https://bugs.launchpad.net/gcc-linaro/+bug/666183

can you take some times to test whether can compile with the neon
support for me?
thanks a lot.

On 9月7日, 下午10时13分, Zoran Angelov <bald...@gmail.com> wrote:
> You can try with this onehttp://bambuser.com/opensourcebut you need to

[Zoran Angelov]

Hi,

i tried and successfully build the ffmpeg with neon support.

I had to add "--enable-memalign-hack" in order build to succeed.

Also note that i was using ndk-r6b (latest) under cygwin ( make=3.81 ).

I'm attaching my build.sh that will only build ffmpeg with neon ( ... for version in neon; do ... ).

Lately with newer ndk's i'm experiencing difficulties with path under cygwin, so i had to modify configure script to adjust temporary directory with cygpath, also attached.

Try with my build.sh first, and use my configure script only if you experience similar difficulties under cygwin (because it fixes $TMPDIR only with cygpath ).

2011/9/8 smallrui <isma...@gmail.com>

[Zoran Angelov]

BTW which version of ndk you were using ?

2011/9/8 Zoran Angelov <bal...@gmail.com>

[Smallrui]

hi, it works, nice!!! it can directly build the library and auto copy
the header to the include folder, that's great!!

but!!, when i linked the static library into my workspace it said
"undefined reference to....".

i have copy the source code from havlenapetr's prject("https://
github.com/havlenapetr/FFMpeg").
it works well in armeabi but cannot build with neon supported.

so i copy that static neon library replace default libffmpeg and
created a Android.mk like
=====================================
LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
LOCAL_MODULE := libavcodec
LOCAL_SRC_FILES := libavcodec.a
include $(PREBUILT_STATIC_LIBRARY)
=====================================
with the default configure also follows havlenapetr's project.
but it errors with follows "undefined reference to...".

BTW, i am using NDK r5b now and ffmpeg version 0.6.3.
anyway can compile with havlenapetr's project directly or how to fix
the errors above?

thanks.

On 9月9日, 上午5时17分, Zoran Angelov <bald...@gmail.com> wrote:
> BTW which version of ndk you were using ?
>

> 2011/9/8 Zoran Angelov <bald...@gmail.com>

>
>
>
>
>
>
>
> > Hi,
> > i tried and successfully build the ffmpeg with neon support.
> > I had to add "--enable-memalign-hack" in order build to succeed.
> > Also note that i was using ndk-r6b (latest) under cygwin ( make=3.81 ).
> > I'm attaching my build.sh that will only build ffmpeg with neon ( ... for
> > version in neon; do ... ).
> > Lately with newer ndk's i'm experiencing difficulties with path under
> > cygwin, so i had to modify configure script to adjust temporary directory
> > with cygpath, also attached.
>
> > Try with my build.sh first, and use my configure script only if you
> > experience similar difficulties under cygwin (because it fixes $TMPDIR only
> > with cygpath ).
>

> > 2011/9/8 smallrui <ismall...@gmail.com>

> >> > You can try with this onehttp://bambuser.com/opensourcebutyou need to

[Zoran Angelov]

You need to link against all static libraries that your code depends on directly and libraries that ffmpeg libraries depends on.

So you should hava something like this ( Android.mk ):

LOCAL_PATH := $(call my-dir)

FFMPEG_DIR := <your ffmpeg dir>

ifeq ($(TARGET_ARCH_ABI), armeabi)

FFMPEG_DIR := $(FFMPEG_DIR)/armeabi

else

ifeq ($(TARGET_ARCH_ABI), armeabi-v7a)

FFMPEG_DIR := $(FFMPEG_DIR)/armeabi-v7a

endif

endif

#ifeq ($(HOST_OS), windows)

# FFMPEG_DIR := $(shell cygpath -m $(FFMPEG_DIR))

#endif

include $(CLEAR_VARS)

LOCAL_MODULE := libavcodec

LOCAL_SRC_FILES := $(FFMPEG_DIR)/lib/$(LOCAL_MODULE).a

LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/$(FFMPEG_DIR)/include

include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE := libavcore

LOCAL_SRC_FILES := $(FFMPEG_DIR)/lib/$(LOCAL_MODULE).a

LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/$(FFMPEG_DIR)/include

include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE := libavdevice

LOCAL_SRC_FILES := $(FFMPEG_DIR)/lib/$(LOCAL_MODULE).a

LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/$(FFMPEG_DIR)/include

include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE := libavfilter

LOCAL_SRC_FILES := $(FFMPEG_DIR)/lib/$(LOCAL_MODULE).a

LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/$(FFMPEG_DIR)/include

include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE := libavformat

LOCAL_SRC_FILES := $(FFMPEG_DIR)/lib/$(LOCAL_MODULE).a

LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/$(FFMPEG_DIR)/include

include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE := libavutil

LOCAL_SRC_FILES := $(FFMPEG_DIR)/lib/$(LOCAL_MODULE).a

LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/$(FFMPEG_DIR)/include

include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE := libswscale

LOCAL_SRC_FILES := $(FFMPEG_DIR)/lib/$(LOCAL_MODULE).a

LOCAL_EXPORT_C_INCLUDES := $(FFMPEG_DIR)/include

include $(PREBUILT_STATIC_LIBRARY)

# yours module definition :

include $(CLEAR_VARS)

....

LOCAL_LDFLAGS     :=  -llog -lz -ldl

LOCAL_STATIC_LIBRARIES := libavformat libavcodec libswscale libavcore libavutil

....

2011/9/13 Smallrui <isma...@gmail.com>

[smallrui]

hi, i have do other trouble things these days, but i still have the
trouble in ffmpeg neon or vfp support.
when i add a flag to Android.mk with "LOCAL_ARM_MODE := arm"
it can be build ok!!!, but it shows the same errors like

SharedLibrary : libffmpeg_jni.so
E:/android-ndk-r5c/havlenapetr/obj/local/armeabi-v7a/
libavcodec.a(dcadsp.o): In
function `ff_dcadsp_init':
E:/android-ndk-r5c/havlenapetr/jni/libffmpeg/libavcodec/dcadsp.c:50:
undefined r
eference to `ff_dcadsp_init_arm'
E:/android-ndk-r5c/havlenapetr/obj/local/armeabi-v7a/
libavcodec.a(dsputil.o): In
function `dsputil_init':
E:/android-ndk-r5c/havlenapetr/jni/libffmpeg/libavcodec/dsputil.c:
4521: undefine
d reference to `dsputil_init_arm'
E:/android-ndk-r5c/havlenapetr/obj/local/armeabi-v7a/
libavcodec.a(fft.o): In fun
ction `ff_fft_init':
E:/android-ndk-r5c/havlenapetr/jni/libffmpeg/libavcodec/fft.c:113:
undefined ref
erence to `ff_fft_init_arm'
E:/android-ndk-r5c/havlenapetr/obj/local/armeabi-v7a/
libavcodec.a(h264dsp.o): In
function `ff_h264dsp_init':
E:/android-ndk-r5c/havlenapetr/jni/libffmpeg/libavcodec/h264dsp.c:317:
undefined
reference to `ff_h264dsp_init_arm'
E:/android-ndk-r5c/havlenapetr/obj/local/armeabi-v7a/
libavcodec.a(h264pred.o): I
n function `ff_h264_pred_init':
E:/android-ndk-r5c/havlenapetr/jni/libffmpeg/libavcodec/h264pred.c:
1176: undefin
ed reference to `ff_h264_pred_init_arm'
E:/android-ndk-r5c/havlenapetr/obj/local/armeabi-v7a/
libavcodec.a(mpegvideo.o):
In function `ff_dct_common_init':
E:/android-ndk-r5c/havlenapetr/jni/libffmpeg/libavcodec/mpegvideo.c:
174: undefin
ed reference to `MPV_common_init_arm'



i saw that in "libffmpeg/libavcodec/arm" folder
the makefile says

OBJS-$(CONFIG_H264DSP) += arm/
h264dsp_init_arm.o \
arm/
h264pred_init_arm.o \

i have already defined the CONFIG_H264DSP macro both in config.h and
config.mak
but their also have undefined reference......
BTW, i found their is nothing .o file in the arm folders.

who to build such like"h264dsp_neon.S"files that can be linked by
ffmpeg?

my apology, but really need your help, thanks.

> 2011/9/13 Smallrui <ismall...@gmail.com>

[smallrui]

attache my project.

http://uploading.com/files/fc43f9a4/havlenapetr.7z/

[smallrui]

anybody can help me?thanks

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