![this](https://istack.dev59.com/5NlDv.webp)
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libswscale/swscale.h>
#include <libavutil/pixfmt.h>
#include <stdio.h>
#include <pthread.h>
#include <jni.h>
#include <android/native_window.h>
#include <android/native_window_jni.h>
#define LOG_TAG "android-ffmpeg-tutorial02"
#define LOGI(...) __android_log_print(4, LOG_TAG, __VA_ARGS__);
#define LOGE(...) __android_log_print(6, LOG_TAG, __VA_ARGS__);
ANativeWindow* window;
char *videoFileName;
AVFormatContext *formatCtx = NULL;
int videoStream;
AVCodecContext *codecCtx = NULL;
AVFrame *decodedFrame = NULL;
AVFrame *frameRGBA = NULL;
jobject bitmap;
void* buffer;
struct SwsContext *sws_ctx = NULL;
int width;
int height;
int stop;
jint naInit(JNIEnv *pEnv, jobject pObj, jstring pFileName) {
AVCodec *pCodec = NULL;
int i;
AVDictionary *optionsDict = NULL;
videoFileName = (char *)(*pEnv)->GetStringUTFChars(pEnv, pFileName, NULL);
LOGI("video file name is %s", videoFileName);
// Register all formats and codecs
av_register_all();
// Open video file
if(avformat_open_input(&formatCtx, videoFileName, NULL, NULL)!=0)
return -1; // Couldn't open file
// Retrieve stream information
if(avformat_find_stream_info(formatCtx, NULL)<0)
return -1; // Couldn't find stream information
// Dump information about file onto standard error
av_dump_format(formatCtx, 0, videoFileName, 0);
// Find the first video stream
videoStream=-1;
for(i=0; i<formatCtx->nb_streams; i++) {
if(formatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO) {
videoStream=i;
break;
}
}
if(videoStream==-1)
return -1; // Didn't find a video stream
// Get a pointer to the codec context for the video stream
codecCtx=formatCtx->streams[videoStream]->codec;
// Find the decoder for the video stream
pCodec=avcodec_find_decoder(codecCtx->codec_id);
if(pCodec==NULL) {
fprintf(stderr, "Unsupported codec!\n");
return -1; // Codec not found
}
// Open codec
if(avcodec_open2(codecCtx, pCodec, &optionsDict)<0)
return -1; // Could not open codec
// Allocate video frame
decodedFrame=avcodec_alloc_frame();
// Allocate an AVFrame structure
frameRGBA=avcodec_alloc_frame();
if(frameRGBA==NULL)
return -1;
return 0;
}
jobject createBitmap(JNIEnv *pEnv, int pWidth, int pHeight) {
int i;
//get Bitmap class and createBitmap method ID
jclass javaBitmapClass = (jclass)(*pEnv)->FindClass(pEnv, "android/graphics/Bitmap");
jmethodID mid = (*pEnv)->GetStaticMethodID(pEnv, javaBitmapClass, "createBitmap", "(IILandroid/graphics/Bitmap$Config;)Landroid/graphics/Bitmap;");
//create Bitmap.Config
//reference: https://forums.oracle.com/thread/1548728
const wchar_t* configName = L"ARGB_8888";
int len = wcslen(configName);
jstring jConfigName;
if (sizeof(wchar_t) != sizeof(jchar)) {
//wchar_t is defined as different length than jchar(2 bytes)
jchar* str = (jchar*)malloc((len+1)*sizeof(jchar));
for (i = 0; i < len; ++i) {
str[i] = (jchar)configName[i];
}
str[len] = 0;
jConfigName = (*pEnv)->NewString(pEnv, (const jchar*)str, len);
} else {
//wchar_t is defined same length as jchar(2 bytes)
jConfigName = (*pEnv)->NewString(pEnv, (const jchar*)configName, len);
}
jclass bitmapConfigClass = (*pEnv)->FindClass(pEnv, "android/graphics/Bitmap$Config");
jobject javaBitmapConfig = (*pEnv)->CallStaticObjectMethod(pEnv, bitmapConfigClass,
(*pEnv)->GetStaticMethodID(pEnv, bitmapConfigClass, "valueOf", "(Ljava/lang/String;)Landroid/graphics/Bitmap$Config;"), jConfigName);
//create the bitmap
return (*pEnv)->CallStaticObjectMethod(pEnv, javaBitmapClass, mid, pWidth, pHeight, javaBitmapConfig);
}
jintArray naGetVideoRes(JNIEnv *pEnv, jobject pObj) {
jintArray lRes;
if (NULL == codecCtx) {
return NULL;
}
lRes = (*pEnv)->NewIntArray(pEnv, 2);
if (lRes == NULL) {
LOGI(1, "cannot allocate memory for video size");
return NULL;
}
jint lVideoRes[2];
lVideoRes[0] = codecCtx->width;
lVideoRes[1] = codecCtx->height;
(*pEnv)->SetIntArrayRegion(pEnv, lRes, 0, 2, lVideoRes);
return lRes;
}
void naSetSurface(JNIEnv *pEnv, jobject pObj, jobject pSurface) {
if (0 != pSurface) {
// get the native window reference
window = ANativeWindow_fromSurface(pEnv, pSurface);
// set format and size of window buffer
ANativeWindow_setBuffersGeometry(window, 0, 0, WINDOW_FORMAT_RGBA_8888);
} else {
// release the native window
ANativeWindow_release(window);
}
}
jint naSetup(JNIEnv *pEnv, jobject pObj, int pWidth, int pHeight) {
width = pWidth;
height = pHeight;
//create a bitmap as the buffer for frameRGBA
bitmap = createBitmap(pEnv, pWidth, pHeight);
if (AndroidBitmap_lockPixels(pEnv, bitmap, &buffer) < 0)
return -1;
//get the scaling context
sws_ctx = sws_getContext (
codecCtx->width,
codecCtx->height,
codecCtx->pix_fmt,
pWidth,
pHeight,
AV_PIX_FMT_RGBA,
SWS_BILINEAR,
NULL,
NULL,
NULL
);
// Assign appropriate parts of bitmap to image planes in pFrameRGBA
// Note that pFrameRGBA is an AVFrame, but AVFrame is a superset
// of AVPicture
avpicture_fill((AVPicture *)frameRGBA, buffer, AV_PIX_FMT_RGBA,
pWidth, pHeight);
return 0;
}
void finish(JNIEnv *pEnv) {
//unlock the bitmap
AndroidBitmap_unlockPixels(pEnv, bitmap);
av_free(buffer);
// Free the RGB image
av_free(frameRGBA);
// Free the YUV frame
av_free(decodedFrame);
// Close the codec
avcodec_close(codecCtx);
// Close the video file
avformat_close_input(&formatCtx);
}
void decodeAndRender(JNIEnv *pEnv) {
ANativeWindow_Buffer windowBuffer;
AVPacket packet;
int i=0;
int frameFinished;
int lineCnt;
while(av_read_frame(formatCtx, &packet)>=0 && !stop) {
// Is this a packet from the video stream?
if(packet.stream_index==videoStream) {
// Decode video frame
avcodec_decode_video2(codecCtx, decodedFrame, &frameFinished,
&packet);
// Did we get a video frame?
if(frameFinished) {
// Convert the image from its native format to RGBA
sws_scale
(
sws_ctx,
(uint8_t const * const *)decodedFrame->data,
decodedFrame->linesize,
0,
codecCtx->height,
frameRGBA->data,
frameRGBA->linesize
);
// lock the window buffer
if (ANativeWindow_lock(window, &windowBuffer, NULL) < 0) {
LOGE("cannot lock window");
} else {
// draw the frame on buffer
LOGI("copy buffer %d:%d:%d", width, height, width*height*4);
LOGI("window buffer: %d:%d:%d", windowBuffer.width,
windowBuffer.height, windowBuffer.stride);
memcpy(windowBuffer.bits, buffer, width * height * 4);
// unlock the window buffer and post it to display
ANativeWindow_unlockAndPost(window);
// count number of frames
++i;
}
}
}
// Free the packet that was allocated by av_read_frame
av_free_packet(&packet);
}
LOGI("total No. of frames decoded and rendered %d", i);
finish(pEnv);
}
/**
* start the video playback
*/
void naPlay(JNIEnv *pEnv, jobject pObj) {
//create a new thread for video decode and render
pthread_t decodeThread;
stop = 0;
pthread_create(&decodeThread, NULL, decodeAndRender, NULL);
}
/**
* stop the video playback
*/
void naStop(JNIEnv *pEnv, jobject pObj) {
stop = 1;
}
jint JNI_OnLoad(JavaVM* pVm, void* reserved) {
JNIEnv* env;
if ((*pVm)->GetEnv(pVm, (void **)&env, JNI_VERSION_1_6) != JNI_OK) {
return -1;
}
JNINativeMethod nm[8];
nm[0].name = "naInit";
nm[0].signature = "(Ljava/lang/String;)I";
nm[0].fnPtr = (void*)naInit;
nm[1].name = "naSetSurface";
nm[1].signature = "(Landroid/view/Surface;)V";
nm[1].fnPtr = (void*)naSetSurface;
nm[2].name = "naGetVideoRes";
nm[2].signature = "()[I";
nm[2].fnPtr = (void*)naGetVideoRes;
nm[3].name = "naSetup";
nm[3].signature = "(II)I";
nm[3].fnPtr = (void*)naSetup;
nm[4].name = "naPlay";
nm[4].signature = "()V";
nm[4].fnPtr = (void*)naPlay;
nm[5].name = "naStop";
nm[5].signature = "()V";
nm[5].fnPtr = (void*)naStop;
jclass cls = (*env)->FindClass(env, "roman10/tutorial/android_ffmpeg_tutorial02/MainActivity");
//Register methods with env->RegisterNatives.
(*env)->RegisterNatives(env, cls, nm, 6);
return JNI_VERSION_1_6;
}
这里是 build.sh 文件
#!/bin/bash
NDK=$HOME/Desktop/adt/android-ndk-r9
SYSROOT=$NDK/platforms/android-9/arch-arm/
TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64
function build_one
{
./configure \
--prefix=$PREFIX \
--enable-shared \
--disable-static \
--disable-doc \
--disable-ffmpeg \
--disable-ffplay \
--disable-ffprobe \
--disable-ffserver \
--disable-avdevice \
--disable-doc \
--disable-symver \
--cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
--target-os=linux \
--arch=arm \
--enable-cross-compile \
--sysroot=$SYSROOT \
--extra-cflags="-Os -fpic $ADDI_CFLAGS" \
--extra-ldflags="$ADDI_LDFLAGS" \
$ADDITIONAL_CONFIGURE_FLAG
make clean
make
make install
}
CPU=arm
PREFIX=$(pwd)/android/$CPU
ADDI_CFLAGS="-marm"
build_one
它在Galaxy tab2上可以运行。我该怎么做才能让它在所有设备上运行?请帮助我。
createBitmap(pEnv, pHeight, pWidth);
。 - Alex Cohn