如何在Android用FFmpeg解码图像_百度知道
如何在Android用FFmpeg解码图像
libavcodec/log2_tab.oCC
libavutil/log2_tab.oCC
libswresample/log2_tab.oAR
libavcodec/libavcodec.aLD
libavutil/libavutil.so.52AR
libavutil/libavutil.aAR
libswresample/libswresample.aLD
libavcodec/libavcodec.so.55LD
libswresample/libswresample.so.0LD
libswscale/libswscale.so.2LD
libavformat/libavformat.so.55INSTALL
libavformat/libavformat.aINSTALL
libavformat/libavformat.soSTRIP
install-libavformat-sharedINSTALL
libavcodec/libavcodec.aINSTALL
libavcodec/libavcodec.soSTRIP
install-libavcodec-sharedINSTALL
libswresample/libswresample.aINSTALL
libswresample/libswresample.soSTRIP
install-libswresample-sharedINSTALL
libswscale/libswscale.aINSTALL
libswscale/libswscale.soSTRIP
install-libswscale-sharedINSTALL
libavutil/libavutil.aINSTALL
libavutil/libavutil.soSTRIP
install-libavutil-sharedINSTALL
libavformat/avformat.hINSTALL
libavformat/avio.hINSTALL
libavformat/version.hINSTALL
libavformat/libavformat.pcINSTALL
libavcodec/avcodec.hINSTALL
libavcodec/avfft.hINSTALL
libavcodec/dxva2.hINSTALL
libavcodec/old_codec_ids.hINSTALL
libavcodec/vaapi.hINSTALL
libavcodec/vda.hINSTALL
libavcodec/vdpau.hINSTALL
libavcodec/version.hINSTALL
libavcodec/xvmc.hINSTALL
libavcodec/libavcodec.pcINSTALL
libswresample/swresample.hINSTALL
libswresample/version.hINSTALL
libswresample/libswresample.pcINSTALL
libswscale/swscale.hINSTALL
libswscale/version.hINSTALL
libswscale/libswscale.pcINSTALL
libavutil/adler32.hINSTALL
libavutil/aes.hINSTALL
libavutil/attributes.hINSTALL
libavutil/audio_fifo.hINSTALL
libavutil/audioconvert.hINSTALL
libavutil/avassert.hINSTALL
libavutil/avstring.hINSTALL
libavutil/avutil.hINSTALL
libavutil/base64.hINSTALL
libavutil/blowfish.hINSTALL
libavutil/bprint.hINSTALL
libavutil/bswap.hINSTALL
libavutil/buffer.hINSTALL
libavutil/channel_layout.hINSTALL
libavutil/common.hINSTALL
libavutil/cpu.hINSTALL
libavutil/crc.hINSTALL
libavutil/error.hINSTALL
libavutil/eval.hINSTALL
libavutil/fifo.hINSTALL
libavutil/file.hINSTALL
libavutil/frame.hINSTALL
libavutil/hmac.hINSTALL
libavutil/imgutils.hINSTALL
libavutil/intfloat.hINSTALL
libavutil/intfloat_readwrite.hINSTALL
libavutil/intreadwrite.hINSTALL
libavutil/lfg.hINSTALL
libavutil/log.hINSTALL
libavutil/mathematics.hINSTALL
libavutil/md5.hINSTALL
libavutil/mem.hINSTALL
libavutil/murmur3.hINSTALL
libavutil/dict.hINSTALL
libavutil/old_pix_fmts.hINSTALL
libavutil/opt.hINSTALL
libavutil/parseutils.hINSTALL
libavutil/pixdesc.hINSTALL
libavutil/pixfmt.hINSTALL
libavutil/random_seed.hINSTALL
libavutil/rational.hINSTALL
libavutil/ripemd.hINSTALL
libavutil/samplefmt.hINSTALL
libavutil/sha.hINSTALL
libavutil/sha512.hINSTALL
libavutil/time.hINSTALL
libavutil/timecode.hINSTALL
libavutil/timestamp.hINSTALL
libavutil/version.hINSTALL
libavutil/xtea.hINSTALL
libavutil/lzo.hINSTALL
libavutil/avconfig.hINSTALL
libavutil/libavutil.pc link ffmpeg.二、新建一个Android工程，在工程目录下新建一个jni文件夹，在文件夹下新建一个ffmpeg文件夹，用来放ffmpeg相关的头文件。在ffmpeg文件夹下新建Android.mk文件用来预先加载ffmpeg动态库。Android.mk文件内容如下： LOCAL_PATH := $(call my-dir)include $(CLEAR_VARS)LOCAL_MODULE := ffmpegLOCAL_SRC_FILES := /path/to/build/output/libffmpeg.soinclude $(PREBUILT_SHARED_LIBRARY)三、在jni下新建Android.mk文件和Application.mk两个文件用来指定编译的顺序和编译的平台以及对应的cpu指令集。 Application.mkAPP_ABI := armeabiAPP_PLATFORM := android-9Android.mkinclude $(call all-subdir-makefiles)四、编写JNI文件，用来绑定java文件与.c文件的交互，文件内容如下：/* * ffmpeg_jni.c * *
Created on: Sep 1, 2014 *
Author: clarck */#include &stdlib.h&#include &string.h&#include &stdio.h&#include &jni.h&#include &../include/ffmpeg_logger.h&#include &../include/ffmpeg.h&// 指定要注册的类，对应完整的java类名#define JNIREG_CLASS &com/clarck/android/ffmpeg/MainActivity&JNIEXPORT void JNICALL native_setDataSource(JNIEnv *env, jclass classzz, jstring path) {
char *filepath = ffmpeg_jstringTostr(env, path);
ffmpeg_setDataSource(filepath);}//Java和JNI函数的绑定static JNINativeMethod method_table[] = {
{ &setDataSource&, &(Ljava/lang/S)V&, native_setDataSource }};//注册native方法到java中static int registerNativeMethods(JNIEnv *env, const char *className,
JNINativeMethod *gMethods, int numMethods) {
clazz = (*env)-&FindClass(env, className);
if (clazz == NULL) {
return JNI_FALSE;
if ((*env)-&RegisterNatives(env, clazz, gMethods, numMethods) & 0) {
return JNI_FALSE;
return JNI_TRUE;}//调用注册方法int register_ndk_load(JNIEnv *env) {
return registerNativeMethods(env, JNIREG_CLASS, method_table,
(int) (sizeof(method_table) / sizeof(method_table[0])));}JNIEXPORT jint JNI_OnLoad(JavaVM *vm, void *reserved) {
JNIEnv *env = NULL;
jint result = -1;
if ((*vm)-&GetEnv(vm, (void**)&env, JNI_VERSION_1_6) != JNI_OK) {
register_ndk_load(env);
//返回JNI的版本
return JNI_VERSION_1_6;}五、编写ffmpeg调用函数，内容如下：/* * ffmpeg.c * *
Created on: Sep 1, 2014 *
Author: clarck */#include &jni.h&#include &android/native_window_jni.h&#include &../include/ffmpeg.h&#include &../include/ffmpeg_logger.h&#include &../ffmpeg/include/libavcodec/avcodec.h&#include &../ffmpeg/include/libavformat/avformat.h&#include &../ffmpeg/include/libavutil/pixfmt.h&#include &../ffmpeg/include/libswscale/swscale.h&char* ffmpeg_jstringTostr(JNIEnv* env, jstring jstr) {
char* pStr = NULL;
jclass jstrObj = (*env)-&FindClass(env, &java/lang/String&);
jstring encode = (*env)-&NewStringUTF(env, &utf-8&);
jmethodID methodId = (*env)-&GetMethodID(env, jstrObj, &getBytes&,
&(Ljava/lang/S)[B&);
jbyteArray byteArray = (jbyteArray) (*env)-&CallObjectMethod(env, jstr,
methodId, encode);
jsize strLen = (*env)-&GetArrayLength(env, byteArray);
jbyte *jBuf = (*env)-&GetByteArrayElements(env, byteArray, JNI_FALSE);
if (jBuf & 0) {
pStr = (char*) malloc(strLen + 1);
if (!pStr) {
return NULL ;
memcpy(pStr, jBuf, strLen);
pStr[strLen] = 0;
(*env)-&ReleaseByteArrayElements(env, byteArray, jBuf, 0);
return pS}void ffmpeg_setDataSource(char *file_path) {
LOGI(&ffmpeg_setDataSource:%s&, file_path);
AVFormatContext *pFormatC
AVCodecContext *pCodecC
AVCodec *pC
AVFrame *pFrame, *pFrameYUV;
AVPacket *
uint8_t *out_
static struct SwsContext *img_convert_
int videoStream, i, numB
int ret, got_
av_register_all();
pFormatCtx = avformat_alloc_context();
if (avformat_open_input(&pFormatCtx, file_path, NULL, NULL) != 0) {
LOGE(&can‘t open the file. \n&);
if (avformat_find_stream_info(pFormatCtx, NULL) & 0) {
LOGE(&Could‘t find stream infomation.\n&);
videoStream = 1;
for (i = 0; i & pFormatCtx-&nb_ i++) {
if (pFormatCtx-&streams[i]-&codec-&codec_type == AVMEDIA_TYPE_VIDEO) {
videoStream =
if (videoStream == -1) {
LOGE(&Didn‘t find a video stream.\n&);
pCodecCtx = pFormatCtx-&streams[videoStream]-&
pCodec = avcodec_find_decoder(pCodecCtx-&codec_id);
if (pCodec == NULL) {
LOGE(&Codec not found.\n&);
if (avcodec_open2(pCodecCtx, pCodec, NULL) & 0) {
LOGE(&Could not open codec.\n&);
pFrame = av_frame_alloc();
pFrameYUV = av_frame_alloc();
numBytes = avpicture_get_size(AV_PIX_FMT_YUV420P, pCodecCtx-&width,
pCodecCtx-&height);
out_buffer = (uint8_t *) av_malloc(numBytes * sizeof(uint8_t));
avpicture_fill((AVPicture *) pFrameYUV, out_buffer, AV_PIX_FMT_YUV420P,
pCodecCtx-&width, pCodecCtx-&height);
int y_size = pCodecCtx-&width * pCodecCtx-&
packet = (AVPacket *) malloc(sizeof(AVPacket));
av_new_packet(packet, y_size);
av_dump_format(pFormatCtx, 0, file_path, 0);
while (av_read_frame(pFormatCtx, packet) &= 0) {
if (packet-&stream_index == videoStream) {
ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture,
LOGI(&avcodec_decode_video2 ret:%d&, ret);
if (ret & 0) {
LOGE(&decode error.\n&);
if (got_picture) {
//TODO 此处可以将解码出来的图片保存起来。
av_free_packet(packet);
av_free(out_buffer);
av_free(pFrameYUV);
avcodec_close(pCodecCtx);
avformat_close_input(&pFormatCtx);}六、编写Android.mk用来编译相关的.c文件，内容如下：LOCAL_PATH := $(call my-dir)include $(CLEAR_VARS)FFMPEG_PATH := ../ffmpegLOCAL_C_INCLUDES := $(LOCAL_PATH)/$(FFMPEG_PATH)/includeLOCAL_MODULE
:= ffmpeg_playerLOCAL_SRC_FILES += ffmpeg_jni.c LOCAL_SRC_FILES += ffmpeg.cLOCAL_SHARED_LIBRARIES := ffmpegLOCAL_LDLIBS := -lloginclude $(BUILD_SHARED_LIBRARY)七、编写java文件中相关执行调用方法package com.clarck.android.import android.app.Aimport android.os.Bpublic class MainActivity extends Activity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setDataSource(&/sdcard/a.mp4&);
public native void setDataSource(String path);
System.loadLibrary(&ffmpeg&);
System.loadLibrary(&ffmpeg_player&);
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