ffmpeg库文件在android平台的使用

[zxg2006]

千辛万苦编译出libffmpeg.so（http://www.cnblogs.com/scottwong/archive/2010/12/17/1909455.html，边调边修改），再按照这位大牛的方法（http://tq09931.iteye.com/blog/1011895），也把第一个ffmpeg函数给运行起来了，可是要用到其他的函数就头大了，都是undefined！
C文件：

/*
 * Copyright (C) 2009 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
#include <string.h>
#include <jni.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef __cplusplus
extern "C" {
#endif

#include <ffmpeg/libavcodec/avcodec.h>
//#include <ffmpeg/libavformat/avformat.h>
//#include <ffmpeg/libavutil/avutil.h>


#define PI 3.14159265358979323846

#ifdef HAVE_AV_CONFIG_H
#undef HAVE_AV_CONFIG_H
#endif


//#include "avcodec.h"
//#include "define.h"

//#define INBUF_SIZE 4096

struct AVCodec *codec=NULL;			  // Codec
struct AVCodecContext *c=NULL;		  // Codec Context
struct AVFrame *picture=NULL;		  // Frame	
 AVPacket avpkt;
		
int iWidth=0;
int iHeight=0;
	
int *colortab=NULL;
int *u_b_tab=NULL;
int *u_g_tab=NULL;
int *v_g_tab=NULL;
int *v_r_tab=NULL;

//short *tmp_pic=NULL;

unsigned int *rgb_2_pix=NULL;
unsigned int *r_2_pix=NULL;
unsigned int *g_2_pix=NULL;
unsigned int *b_2_pix=NULL;
		
void DeleteYUVTab()
{
//	av_free(tmp_pic);
	
	av_free(colortab);
	av_free(rgb_2_pix);
}

void CreateYUVTab_16()
{
	int i;
	int u, v;
	
//	tmp_pic = (short*)av_malloc(iWidth*iHeight*2); // 缓存 iWidth * iHeight * 16bits

	colortab = (int *)av_malloc(4*256*sizeof(int));
	u_b_tab = &colortab[0*256];
	u_g_tab = &colortab[1*256];
	v_g_tab = &colortab[2*256];
	v_r_tab = &colortab[3*256];

	for (i=0; i<256; i++)
	{
		u = v = (i-128);

		u_b_tab[i] = (int) ( 1.772 * u);
		u_g_tab[i] = (int) ( 0.34414 * u);
		v_g_tab[i] = (int) ( 0.71414 * v); 
		v_r_tab[i] = (int) ( 1.402 * v);
	}

	rgb_2_pix = (unsigned int *)av_malloc(3*768*sizeof(unsigned int));

	r_2_pix = &rgb_2_pix[0*768];
	g_2_pix = &rgb_2_pix[1*768];
	b_2_pix = &rgb_2_pix[2*768];

	for(i=0; i<256; i++)
	{
		r_2_pix[i] = 0;
		g_2_pix[i] = 0;
		b_2_pix[i] = 0;
	}

	for(i=0; i<256; i++)
	{
		r_2_pix[i+256] = (i & 0xF8) << 8;
		g_2_pix[i+256] = (i & 0xFC) << 3;
		b_2_pix[i+256] = (i ) >> 3;
	}

	for(i=0; i<256; i++)
	{
		r_2_pix[i+512] = 0xF8 << 8;
		g_2_pix[i+512] = 0xFC << 3;
		b_2_pix[i+512] = 0x1F;
	}

	r_2_pix += 256;
	g_2_pix += 256;
	b_2_pix += 256;
}

void DisplayYUV_16(unsigned int *pdst1, unsigned char *y, unsigned char *u, unsigned char *v, int width, int height, int src_ystride, int src_uvstride, int dst_ystride)
{
	int i, j;
	int r, g, b, rgb;

	int yy, ub, ug, vg, vr;

	unsigned char* yoff;
	unsigned char* uoff;
	unsigned char* voff;
	
	unsigned int* pdst=pdst1;

	int width2 = width/2;
	int height2 = height/2;
	
	if(width2>iWidth/2)
	{
		width2=iWidth/2;

		y+=(width-iWidth)/4*2;
		u+=(width-iWidth)/4;
		v+=(width-iWidth)/4;
	}
	if(height2>iHeight)
		height2=iHeight;

	//LOGD("height2....%d",height2);
	for(j=0; j<height2; j++) // 一次2x2共四个像素
	{
		yoff = y + j * 2 * src_ystride;
		uoff = u + j * src_uvstride;
		voff = v + j * src_uvstride;

		for(i=0; i<width2; i++)
		{
			yy  = *(yoff+(i<<1));
			ub = u_b_tab[*(uoff+i)];
			ug = u_g_tab[*(uoff+i)];
			vg = v_g_tab[*(voff+i)];
			vr = v_r_tab[*(voff+i)];

			b = yy + ub;
			g = yy - ug - vg;
			r = yy + vr;

			rgb = r_2_pix[r] + g_2_pix[g] + b_2_pix[b];

			yy = *(yoff+(i<<1)+1);
			b = yy + ub;
			g = yy - ug - vg;
			r = yy + vr;

			pdst[(j*dst_ystride+i)] = (rgb)+((r_2_pix[r] + g_2_pix[g] + b_2_pix[b])<<16);

			yy = *(yoff+(i<<1)+src_ystride);
			b = yy + ub;
			g = yy - ug - vg;
			r = yy + vr;

			rgb = r_2_pix[r] + g_2_pix[g] + b_2_pix[b];

			yy = *(yoff+(i<<1)+src_ystride+1);
			b = yy + ub;
			g = yy - ug - vg;
			r = yy + vr;

			pdst [((2*j+1)*dst_ystride+i*2)>>1] = (rgb)+((r_2_pix[r] + g_2_pix[g] + b_2_pix[b])<<16);
		}
	}
}

//====================================================

jint Java_com_watch_VView_InitDecoder(JNIEnv* env, jobject thiz, jint width, jint height)
{
	iWidth = width;
	iHeight = height;
   

    av_init_packet(&avpkt);

    /* set end of buffer to 0 (this ensures that no overreading happens for damaged mpeg streams) */
    //memset(inbuf + INBUF_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);

    printf("Video decoding\n");

    /* find the mpeg1 video decoder */
    codec = avcodec_find_decoder(CODEC_ID_H264);
    if (!codec) {
        fprintf(stderr, "codec not found\n");
        return 0;//exit(1);
    }

    c= avcodec_alloc_context();
    picture= avcodec_alloc_frame();

    if(codec->capabilities&CODEC_CAP_TRUNCATED)
        c->flags|= CODEC_FLAG_TRUNCATED; /* we do not send complete frames */
	 /* For some codecs, such as msmpeg4 and mpeg4, width and height
       MUST be initialized there because this information is not
       available in the bitstream. */

    /* open it */
    if (avcodec_open(c, codec) < 0) {
        fprintf(stderr, "could not open codec\n");
        //exit(1);
        return 0;
    }
	return 1;
}

/*
 * Class:     h264_com_VView
 * Method:    UninitDecoder
 * Signature: ()I
 */
jint Java_com_watch_VView_UninitDecoder(JNIEnv* env, jobject thiz)
{
	//LOGD("UninitDecoder");
	if(c)
	{
		decode_end(c);
	    free(c->priv_data);

		free(c);
		c = NULL;
	}

	if(picture)
	{
		free(picture);
		picture = NULL;
	}
	avcodec_close(c);
	    av_free(c);
	    av_free(picture);
	DeleteYUVTab();
	
	return 1;	
}

/*
 * Class:     h264_com_VView
 * Method:    DecoderNal
 * Signature: ([B[I)I
 */
jint Java_com_watch_VView_DecoderNal(JNIEnv* env, jobject thiz, jbyteArray in, jint nalLen, jbyteArray out)
{
	int i;
	int imod;
	int got_picture;

	jbyte * Buf = (jbyte*)(*env)->GetByteArrayElements(env, in, 0);
	jbyte * Pixel= (jbyte*)(*env)->GetByteArrayElements(env, out, 0);
	//avpkt.size = nalLen;
	//avpkt.data = Buf;
	//int consumed_bytes = avcodec_decode_video2(c, picture, &got_picture, &avpkt);// nalLen); 
	int consumed_bytes = avcodec_decode_video(c, picture, &got_picture, Buf, nalLen); 
	
	//LOGD("decode_frame");
	if(consumed_bytes > 0)
	{
		DisplayYUV_16((int*)Pixel, picture->data[0], picture->data[1], picture->data[2], c->width, c->height, picture->linesize[0], picture->linesize[1], iWidth);	
/*
		for(i=0; i<c->height; i++)
			fwrite(picture->data[0] + i * picture->linesize[0], 1, c->width, outf);

		for(i=0; i<c->height/2; i++)
			fwrite(picture->data[1] + i * picture->linesize[1], 1, c->width/2, outf);

		for(i=0; i<c->height/2; i++)
			fwrite(picture->data[2] + i * picture->linesize[2], 1, c->width/2, outf);
// */
	}
	//LOGD("DisplayYUV_16");
    (*env)->ReleaseByteArrayElements(env, in, Buf, 0);    
    (*env)->ReleaseByteArrayElements(env, out, Pixel, 0); 

	return consumed_bytes;	
}
#ifdef __cplusplus
}
#endif

[zxg2006]

发现了！LOCAL_LDLIBS:=-L$(SYSROOT)/usr/lib -llog覆盖LOCAL_LDLIBS := -lffmpeg 了！！！

[zxg2006]

E:/zxg/workstation/androidApplication/WacthLogin/obj/local/armeabi/objs/H264Android/H264Android.o: In function `Java_com_watch_VView_DecoderNal':
E:/zxg/workstation/androidApplication/WacthLogin/jni/H264Android.c:285: undefined reference to `avcodec_decode_video'
E:/zxg/workstation/androidApplication/WacthLogin/obj/local/armeabi/objs/H264Android/H264Android.o: In function `DeleteYUVTab':
E:/zxg/workstation/androidApplication/WacthLogin/jni/H264Android.c:68: undefined reference to `av_free'
E:/zxg/workstation/androidApplication/WacthLogin/jni/H264Android.c:69: undefined reference to `av_free'
E:/zxg/workstation/androidApplication/WacthLogin/obj/local/armeabi/objs/H264Android/H264Android.o: In function `Java_com_watch_VView_UninitDecoder':
E:/zxg/workstation/androidApplication/WacthLogin/jni/H264Android.c:249: undefined reference to `decode_end'
E:/zxg/workstation/androidApplication/WacthLogin/jni/H264Android.c:261: undefined reference to `avcodec_close'
E:/zxg/workstation/androidApplication/WacthLogin/jni/H264Android.c:262: undefined reference to `av_free'
E:/zxg/workstation/androidApplication/WacthLogin/jni/H264Android.c:263: undefined reference to `av_free'
E:/zxg/workstation/androidApplication/WacthLogin/obj/local/armeabi/objs/H264Android/H264Android.o: In function `Java_com_watch_VView_InitDecoder':
E:/zxg/workstation/androidApplication/WacthLogin/jni/H264Android.c:207: undefined reference to `av_init_packet'
E:/zxg/workstation/androidApplication/WacthLogin/jni/H264Android.c:215: undefined reference to `avcodec_find_decoder'
E:/zxg/workstation/androidApplication/WacthLogin/jni/H264Android.c:221: undefined reference to `avcodec_alloc_context'
E:/zxg/workstation/androidApplication/WacthLogin/jni/H264Android.c:222: undefined reference to `avcodec_alloc_frame's definition or declaration, which is pr
E:/zxg/workstation/androidApplication/WacthLogin/jni/H264Android.c:231: undefined reference to `avcodec_open'
E:/zxg/workstation/androidApplication/WacthLogin/jni/H264Android.c:231: undefined reference to `avcodec_open'ecContext' declared inside parameter list
E:/zxg/workstation/androidApplication/WacthLogin/obj/local/armeabi/objs/H264Android/H264Android.o: In function `CreateYUVTab_16':inside parameter list
E:/zxg/workstation/androidApplication/WacthLogin/jni/H264Android.c:79: undefined reference to `av_malloc'VCodecContext' declared inside parameter list
E:/zxg/workstation/androidApplication/WacthLogin/jni/H264Android.c:95: undefined reference to `av_malloc'VCodecContext' declared inside parameter list
collect2: ld returned 1 exit statuson/WacthLogin/jni/ffmpeg/libavcodec/avcodec.h:1826: warning: 'struct AVCodecContext' declared inside parameter list
/cygdrive/d/android-sdk-windows/ndk/android-ndk-r5/build/core/build-binary.mk:266: recipe for target `/cygdrive/e/zxg/workstation/androidApplication/WacthLo
obj/local/armeabi/libH264Android.so' failedLogin/jni/ffmpeg/libavcodec/avcodec.h:2091: warning: 'struct AVCodecContext' declared inside parameter list
make: *** [/cygdrive/e/zxg/workstation/androidApplication/WacthLogin/obj/local/armeabi/libH264Android.so] Error 1ntext' declared inside parameter list
E:/zxg/workstation/androidApplication/WacthLogin/jni/ffmpeg/libavcodec/avcodec.h:3341: warning: 'struct AVCodecContext' declared inside parameter list

网上有朋友提到版本问题，试了几个版本了，不行。我的so文件是ffmpeg0.6.3 + ndk r5 在ubuntu下编译的，所以在jni中放入的也是ffmpeg0.6.3的源码，请教各位这是啥情况呢？可以应对？

[rightorwrong]

首先，你贴的c文件是jni部分，用ffmpeg0.6.3 + ndk r5 编译
然后java部分用loadlibrary加载这个编译出来的so文件，当然也要加载上ffmpeg的so

只要jni部分能编译出so文件，java部分在loadlibrary所需要的so，不会出现你那样的问题

最大可能就是你用错了

[zxg2006]

[Quote=引用 2 楼 的回复:]
首先，你贴的c文件是jni部分，用ffmpeg0.6.3 + ndk r5 编译
然后java部分用loadlibrary加载这个编译出来的so文件，当然也要加载上ffmpeg的so

只要jni部分能编译出so文件，java部分在loadlibrary所需要的so，不会出现你那样的问题

最大可能就是你用错了
[/Quote]
我的用法是：
1、先ffmpeg0.6.3 + ndk r5 在ubuntu下编译出的so文件，
2、按照网上方法，把这个so文件放在ndk的libs文件夹下，
3、然后在自己的工程中编写jni文件，
4、把ffmpeg源码也放到了jni文件夹下，
5、修改android.mk文件，添加libffmpeg.so的库路径，
6、在jni文件中包含要调用的函数所在的h文件，
7、调用函数。。。
请问是这样用吗？
我这样来调用avcodec_version()都是可以的。
不知道是不是源码版本上的问题？
avcodec_decode_video2是avcodec_decode_video 的新版本用法？

Android.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
PATH_TO_FFMPEG_SOURCE:=$(LOCAL_PATH)/ffmpeg   
LOCAL_C_INCLUDES += $(PATH_TO_FFMPEG_SOURCE)   
LOCAL_LDLIBS := -lffmpeg   
LOCAL_MODULE    := H264Android
LOCAL_SRC_FILES := H264Android.c

LOCAL_LDLIBS:=-L$(SYSROOT)/usr/lib -llog
include $(BUILD_SHARED_LIBRARY)

[jj100432177]

你好 我也将ffmpeg 打了个 .so的包
但是不知道里面都有什么函数，
我想把 yuv420 的数据流 保存成视频，都需要做什么操作，或者有什么参考资料吗？


知道的话 告诉下吧， 弄了几天了， 还没头绪， 谢谢了