android ffmpeg支持avi吗

2025-03-30 19:21:25
推荐回答(1个)
回答1:

1.把封装好的视频数据解码为YUV
2.YUV数据转化为RGB。
3.一帧一帧的传给SurfaceView显示出来

其实YUV数据可直接在SurfaceView显示,在研究Android系统多媒体框架的stagefright视频显示时发现,根本找不到omx解码后的yuv是怎么转换成RGB的代码,yuv数据在render之后就找不到去向了,可画面确确实实的显示出来了。

稍微看一下AsomePlayer的代码,不难发现,视频的每一帧是通过调用了SoftwareRenderer来渲染显示的、这是一个很大的突破,以后可以直接丢yuv数据到surface显示,无需耗时耗效率的yuv转RGB了,这部分知识点会在以后的文章中实现本篇不涉及。

下面看具体实现:
1.首先拷贝一份上一章的代码命名为ffmpegandroidplayer
2.根据本章需要修改代码

界面上一个SurfaceView

xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
tools:showIn="@layout/activity_main">

android:id="@+id/surface_view"
android:layout_width="match_parent"
android:layout_height="match_parent" />


一个native 的play方法负责把Surface传给底层
@Override
public void surfaceCreated(SurfaceHolder holder) {
new Thread(new Runnable() {
@Override
public void run() {
play(surfaceHolder.getSurface());
}
}).start();
}
...

public native int play(Object surface);

3.修改CMakeLists.txt
target_link_libraries( native-lib log android avutil-55 swresample-2 avcodec-57 avfilter-6 swscale-4 avdevice-57 avformat-57
${log-lib} )

4.实现play方法。
写这里方法的时候报了一个错,记录一下。
java.lang.UnsatisfiedLinkError: No implementation found for int com.ws.ffmpegandroidplayer.MainActivity.play
1
1

解决思路:

1、JNIEnv *env参数的使用
所有JNI接口的第一个参数是JNIEnv *env, 在C中,使用方法是
(*env)->NewStringUTF(env, "Hello from JNI!");
但在C++中,其调用方法是
env->NewStringUTF("Hello from JNI!");
为什么有这种区别呢,看看jni.h中关于JNIEnv的定义就可以知道了:
#if defined(__cplusplus)
typedef _JNIEnv JNIEnv;
#else
typedef const struct JNINativeInterface* JNIEnv;
#endif
可以看到,对于C和C++,定义有所不同,主要原因是C不支持类,所以采用了一种变通的方法。

2、接口找不到
在Java中调用JNI接口时,出现异常,察看日志,发现有如下错误:
WARN/dalvikvm(422): No implementation found for native Lcom/whty/wcity/HelixPlayer;.setDllPath (Ljava/lang/String;)V
检查了几遍代码,Cpp中确实定义了这个接口,而且仔细对照了Java的包名、类名,确实没有错误,那为什么会出现这种问题呢。后来突然想到,JNI接口 都是以C的方式定义的,现在使用C++实现,函数定义前是否需要加上extern "C"呢?为此定义了一个头文件,在CPP文件中include该头文件,头文件加上如下代码片断:
#ifdef __cplusplus
extern "C" {
#endif
#endif
...
#ifdef __cplusplus

Java_com_ws_ffmpegandroidplayer_MainActivity_play源码如下

#include
#include
#include
#include

extern "C" {
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libswscale/swscale.h"
#include "libavutil/imgutils.h"
//};

#define LOG_TAG "ffmpegandroidplayer"
#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, __VA_ARGS__)

JNIEXPORT jint JNICALL
Java_com_ws_ffmpegandroidplayer_MainActivity_play
(JNIEnv *env, jclass clazz, jobject surface) {
LOGD("play");

// sd卡中的视频文件地址,可自行修改或者通过jni传入
//char *file_name = "/storage/emulated/0/ws2.mp4";
char *file_name = "/storage/emulated/0/video.avi";

av_register_all();

AVFormatContext *pFormatCtx = avformat_alloc_context();

// Open video file
if (avformat_open_input(&pFormatCtx, file_name, NULL, NULL) != 0) {

LOGD("Couldn't open file:%s\n", file_name);
return -1; // Couldn't open file
}

// Retrieve stream information
if (avformat_find_stream_info(pFormatCtx, NULL) < 0) {
LOGD("Couldn't find stream information.");
return -1;
}

// Find the first video stream
int videoStream = -1, i;
for (i = 0; i < pFormatCtx->nb_streams; i++) {
if (pFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO
&& videoStream < 0) {
videoStream = i;
}
}
if (videoStream == -1) {
LOGD("Didn't find a video stream.");
return -1; // Didn't find a video stream
}

// Get a pointer to the codec context for the video stream
AVCodecContext *pCodecCtx = pFormatCtx->streams[videoStream]->codec;

// Find the decoder for the video stream
AVCodec *pCodec = avcodec_find_decoder(pCodecCtx->codec_id);
if (pCodec == NULL) {
LOGD("Codec not found.");
return -1; // Codec not found
}

if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0) {
LOGD("Could not open codec.");
return -1; // Could not open codec
}

// 获取native window
ANativeWindow *nativeWindow = ANativeWindow_fromSurface(env, surface);

// 获取视频宽高
int videoWidth = pCodecCtx->width;
int videoHeight = pCodecCtx->height;

// 设置native window的buffer大小,可自动拉伸
ANativeWindow_setBuffersGeometry(nativeWindow, videoWidth, videoHeight,
WINDOW_FORMAT_RGBA_8888);
ANativeWindow_Buffer windowBuffer;

if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0) {
LOGD("Could not open codec.");
return -1; // Could not open codec
}

// Allocate video frame
AVFrame *pFrame = av_frame_alloc();

// 用于渲染
AVFrame *pFrameRGBA = av_frame_alloc();
if (pFrameRGBA == NULL || pFrame == NULL) {
LOGD("Could not allocate video frame.");
return -1;
}

// Determine required buffer size and allocate buffer
// buffer中数据就是用于渲染的,且格式为RGBA
int numBytes = av_image_get_buffer_size(AV_PIX_FMT_RGBA, pCodecCtx->width, pCodecCtx->height,
1);
uint8_t *buffer = (uint8_t *) av_malloc(numBytes * sizeof(uint8_t));
av_image_fill_arrays(pFrameRGBA->data, pFrameRGBA->linesize, buffer, AV_PIX_FMT_RGBA,
pCodecCtx->width, pCodecCtx->height, 1);

// 由于解码出来的帧格式不是RGBA的,在渲染之前需要进行格式转换
struct SwsContext *sws_ctx = sws_getContext(pCodecCtx->width,
pCodecCtx->height,
pCodecCtx->pix_fmt,
pCodecCtx->width,
pCodecCtx->height,
AV_PIX_FMT_RGBA,
SWS_BILINEAR,
NULL,
NULL,
NULL);

int frameFinished;
AVPacket packet;
while (av_read_frame(pFormatCtx, &packet) >= 0) {
// Is this a packet from the video stream?
if (packet.stream_index == videoStream) {

// Decode video frame
avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet);

// 并不是decode一次就可解码出一帧
if (frameFinished) {

// lock native window buffer
ANativeWindow_lock(nativeWindow, &windowBuffer, 0);

// 格式转换
sws_scale(sws_ctx, (uint8_t const *const *) pFrame->data,
pFrame->linesize, 0, pCodecCtx->height,
pFrameRGBA->data, pFrameRGBA->linesize);

// 获取stride
uint8_t *dst = (uint8_t *) windowBuffer.bits;
int dstStride = windowBuffer.stride * 4;
uint8_t *src = (pFrameRGBA->data[0]);
int srcStride = pFrameRGBA->linesize[0];

// 由于window的stride和帧的stride不同,因此需要逐行复制
int h;
for (h = 0; h < videoHeight; h++) {
memcpy(dst + h * dstStride, src + h * srcStride, srcStride);
}

ANativeWindow_unlockAndPost(nativeWindow);
}

}
av_packet_unref(&packet);
}

av_free(buffer);
av_free(pFrameRGBA);

// Free the YUV frame
av_free(pFrame);

// Close the codecs
avcodec_close(pCodecCtx);

// Close the video file
avformat_close_input(&pFormatCtx);
return 0;
}
}

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