류종택의 프로그래밍 강의실

libs.zip

jstring
Java_ryulib_ffmpeg_FFMpeg_getStreamInformation(JNIEnv* env, jclass clazz, jint handle)
{
	FFmpegHandle *pHandle = (FFmpegHandle *) handle;

	char videoInformation[512];
	avcodec_string(videoInformation, sizeof(videoInformation), pHandle->pVideoCtx, 0);

	char audioInformation[512];
	avcodec_string(audioInformation, sizeof(audioInformation), pHandle->pAudioCtx, 0);

	char result[1024 * 4];

	sprintf(result,
		"%s\n%s",
		videoInformation, audioInformation
	);

    return (*env)->NewStringUTF(env, result);
}

package ryulib.ffmpeg;

import android.graphics.Bitmap;

public class FFMpeg {
	
	static {
		System.loadLibrary("ffmpeg");	
		System.loadLibrary("ryumpeg");	
	}
	
	public static final int Error_General = -1;
	public static final int Error_Can_Not_Open_File = -2;
	public static final int Error_Can_Not_Find_StreamInfo = -3;
	public static final int Error_Can_Not_Find_VidoeStream = -4;
	public static final int Error_Can_Not_Find_AudioStream = -5;
	public static final int Error_Can_Not_Open_VideoCodec = -6;
	public static final int Error_Can_Not_Open_AudioCodec = -7;
	
	public static final int UnknownPacket = 0;
	public static final int VideoPacket = 1;
	public static final int AudioPacket = 2;
	
	public static native String getDebugString();		
	
	// openFile(), closeFile(), start(), stop(): Main Thread에서 실행합니다.
	// start(), stop(): Thread-safe 합니다.
	
	// TODO : 파일이 없을 경우 어플리케이션이 죽음
	public static native int openFile(String fileName);
	public static native void closeHandle(int handle);
	
	public static native String getStreamInformation(int handle);	
	 
	// openFile() 호출 시, 내부에서 start()를 호출한 상태가 된다.
	public static native void start(int handle);
	public static native void stop(int handle);
	
	public static native int readFrameToBuffer(int handle);
	
	public static native byte[] getAudioData(int handle);
	public static native int getVideoData(int handle, Bitmap bitmap);

	public static native int getAudioPacketCount(int handle);
	public static native int getVideoPacketCount(int handle);
	
	// seekByTime(), rewindByTime(), forwardByTime(), readAudioPacket(): 동일한 쓰레드에서 사용되야 합니다. 
	
	public static native boolean seekByTime(int handle, int ms);
	public static native boolean rewindByTime(int handle, int ms);
	public static native boolean forwardByTime(int handle, int ms);

	public static native int getDuration(int handle);
	public static native int getPosition(int handle);	
	public static native int getVideoWidth(int handle);
	public static native int getVideoHeight(int handle);
	public static native int getSampleRate(int handle);
	public static native int getChannels(int handle);

}

jni.pdf

libffmpeg.zip

• Cygwin에서 작업하는 것보다는 우분투에서 작업하는 것이 더 쉽더군요. Cygwin에서 작업하다가 몇 일 더 까먹었습니다.

• 우분투에 Z Lib를 설치하고 나서 재부팅하면 우분투가 부팅이 안되는 에러가 발생하였습니다.
   http://ryulib.tistory.com/119 를 참고하시기 바랍니다.

• 우분투에 기본적인 개발환경을 세팅한 VMware 이미지는, http://ryulib.tistory.com/122 를 참고하시기 바랍니다. 

• 윈도우 환경에서도 작업하기 위해서 제가 지원받은 PC가 내문서 등이 E: 드라이브로 설정되어 있었습니다.  이렇게 되면 Android 에뮬레이터가 실행되지 않는 에러가 발생합니다.  이클립스 및 안드로이드 SDK 문제인가 하고 계속 재 설치하느라, 몇 일 고생했습니다.  (일본 지진의 영향인지, 구글이 너무 느려서 다운로드 중 파일이 손상된 것인가 의심하느라)
  해당 에러 메시지를 구글에서 검색하시면 몇 가지 해결책이 나옵니다.  
  (저는 윈도우를 다시 설치하는 쪽으로..)  

• NDK를 이용해서 FFmpeg을 컴파일하는 방법은 아래의 링크를 참고하세요.  일단 컴파일은 되지만 파일 사이즈가 위에서 언급한 것처럼 너무 작고 사용할 수 없는 결과물 입니다.  
  http://androidcore.com/android-programming-tutorials/641-how-to-compile-ffmpeg-on-android.html

Create a new project, make jni folder, then download and extract ffmpeg, rename ffmpeg folder to ffmpeg.

Make a new config.sh in ffmpeg, notice a bout PREBUILT path and PLATFORM:

#!/bin/bash

PREBUILT=/home/abitno/Android/android-ndk-r4/build/prebuilt/linux-x86/arm-eabi-4.4.0
PLATFORM=/home/abitno/Android/android-ndk-r4/build/platforms/android-8/arch-arm

./configure --target-os=linux \
	--arch=arm \
	--enable-version3 \
	--enable-gpl \
	--enable-nonfree \
	--disable-stripping \
	--disable-ffmpeg \
	--disable-ffplay \
	--disable-ffserver \
	--disable-ffprobe \
	--disable-encoders \
	--disable-muxers \
	--disable-devices \
	--disable-protocols \
	--enable-protocol=file \
	--enable-avfilter \
	--disable-network \
	--disable-mpegaudio-hp \
	--disable-avdevice \
	--enable-cross-compile \
	--cc=$PREBUILT/bin/arm-eabi-gcc \
	--cross-prefix=$PREBUILT/bin/arm-eabi- \
	--nm=$PREBUILT/bin/arm-eabi-nm \
	--extra-cflags="-fPIC -DANDROID" \
	--disable-asm \
	--enable-neon \
	--enable-armv5te \
	--extra-ldflags="-Wl,-T,$PREBUILT/arm-eabi/lib/ldscripts/armelf.x -Wl,-rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -nostdlib $PREBUILT/lib/gcc/arm-eabi/4.4.0/crtbegin.o $PREBUILT/lib/gcc/arm-eabi/4.4.0/crtend.o -lc -lm -ldl"

Then change mode config.sh and run

chmod +x config.sh
./config.sh

When config is completed, open config.h, find:

#define restrict restrict

replace by

#define restrict

Open libavutil/libm.h, remove static keyword in all function declaration.

Open Makefile in libavcodec, libavfilter, libavformat, libavutil, libpostproc and libswscale and remove two lines:

include $(SUBDIR)../subdir.mak
include $(SUBDIR)../config.mak

add new av.mk file in ffmpeg folder:

# LOCAL_PATH is one of libavutil, libavcodec, libavformat, or libswscale

#include $(LOCAL_PATH)/../config-$(TARGET_ARCH).mak
include $(LOCAL_PATH)/../config.mak

OBJS :=
OBJS-yes :=
MMX-OBJS-yes :=
include $(LOCAL_PATH)/Makefile

# collect objects
OBJS-$(HAVE_MMX) += $(MMX-OBJS-yes)
OBJS += $(OBJS-yes)

FFNAME := lib$(NAME)
FFLIBS := $(foreach,NAME,$(FFLIBS),lib$(NAME))
FFCFLAGS  = -DHAVE_AV_CONFIG_H -Wno-sign-compare -Wno-switch -Wno-pointer-sign
FFCFLAGS += -DTARGET_CONFIG=\"config-$(TARGET_ARCH).h\"

ALL_S_FILES := $(wildcard $(LOCAL_PATH)/$(TARGET_ARCH)/*.S)
ALL_S_FILES := $(addprefix $(TARGET_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))
else
C_OBJS := $(OBJS)
S_OBJS :=
endif

C_FILES := $(patsubst %.o,%.c,$(C_OBJS))
S_FILES := $(patsubst %.o,%.S,$(S_OBJS))

FFFILES := $(sort $(S_FILES)) $(sort $(C_FILES))

Create Android.mk in jni folder:

include $(all-subdir-makefiles)

Create Android.mk in ffmpeg folder:

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_STATIC_LIBRARIES := libavformat libavcodec libavutil libpostproc libswscale
LOCAL_MODULE := ffmpeg
include $(BUILD_SHARED_LIBRARY)
include $(call all-makefiles-under,$(LOCAL_PATH))

libavformat/Android.mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
include $(LOCAL_PATH)/../av.mk
LOCAL_SRC_FILES := $(FFFILES)
LOCAL_C_INCLUDES :=		\
	$(LOCAL_PATH)		\
	$(LOCAL_PATH)/..
LOCAL_CFLAGS += $(FFCFLAGS)
LOCAL_CFLAGS += -include "string.h" -Dipv6mr_interface=ipv6mr_ifindex
LOCAL_LDLIBS := -lz
LOCAL_STATIC_LIBRARIES := $(FFLIBS)
LOCAL_MODULE := $(FFNAME)
include $(BUILD_STATIC_LIBRARY)

libavcodec/Android.mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
include $(LOCAL_PATH)/../av.mk
LOCAL_SRC_FILES := $(FFFILES)
LOCAL_C_INCLUDES :=		\
	$(LOCAL_PATH)		\
	$(LOCAL_PATH)/..
LOCAL_CFLAGS += $(FFCFLAGS)
LOCAL_LDLIBS := -lz
LOCAL_STATIC_LIBRARIES := $(FFLIBS)
LOCAL_MODULE := $(FFNAME)
include $(BUILD_STATIC_LIBRARY)

libavfilter, libavutil, libpostproc and libswscale / Android.mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
include $(LOCAL_PATH)/../av.mk
LOCAL_SRC_FILES := $(FFFILES)
LOCAL_C_INCLUDES :=		\
	$(LOCAL_PATH)		\
	$(LOCAL_PATH)/..
LOCAL_CFLAGS += $(FFCFLAGS)
LOCAL_STATIC_LIBRARIES := $(FFLIBS)
LOCAL_MODULE := $(FFNAME)
include $(BUILD_STATIC_LIBRARY)

now, just go to jni folder and type ndk-build, then you will have ffmpeg.so

Source: http://abitno.me/compile-ffmpeg-android-ndk

Edit: if you need a reference:

http://rockplayer.freecoder.org/download/rockplayer_ffmpeg.zip