FFMPEG的文档少，JavaCV的文档就更少了。从网上找到这篇100行代码实现最简单的基于FFMPEG+SDL的视频播放器。地址是http://blog.csdn.net/leixiaohua1020/article/details/8652605。
用JavaCV重新实现并使用opencv_highgui进行显示。
1 import com.googlecode.javacpp.IntPointer;
2 import com.googlecode.javacpp.Pointer;3 import com.googlecode.javacv.cpp.avcodec;
4 import com.googlecode.javacv.cpp.avcodec.AVPacket;
5 import com.googlecode.javacv.cpp.avcodec.AVPicture;
6 import com.googlecode.javacv.cpp.avformat;
7 import com.googlecode.javacv.cpp.avutil;
8 import com.googlecode.javacv.cpp.avutil.AVDictionary;
9 import com.googlecode.javacv.cpp.opencv_core;
10 import static com.googlecode.javacv.cpp.opencv_core.IPL_DEPTH_8U;
11 import com.googlecode.javacv.cpp.opencv_core.IplImage;
12 import static com.googlecode.javacv.cpp.opencv_core.cvSize;
13 import com.googlecode.javacv.cpp.opencv_highgui;
14 import static com.googlecode.javacv.cpp.opencv_highgui.cvDestroyWindow;
15 import static com.googlecode.javacv.cpp.opencv_highgui.cvNamedWindow;
16 import com.googlecode.javacv.cpp.swscale;
17 import com.googlecode.javacv.cpp.swscale.SwsContext;
18
19 /**
20 *
21 * @author [email protected]
22 */
23 public class DecodingH264 {
24
25 public static void main(String[] args) {
26 String filePath = "Images/butterfly.h264";
27
28 // Register all formats and codes
29 avformat.av_register_all();
30 avcodec.avcodec_register_all();
31
32 // Open video file
33 avformat.AVFormatContext formatCtx = avformat.avformat_alloc_context();
34 if (avformat.avformat_open_input(formatCtx, filePath, null, null) != 0) {
35 System.out.println("无法打开文件\n");
36 return;
37 }
38
39 if (avformat.avformat_find_stream_info(formatCtx, (AVDictionary) null) < 0) {
40 System.out.println("Couldn‘t find stream information.\n");
41 return;
42 }
43 int videoIndex = -1;
44 for (int i = 0; i < formatCtx.nb_streams(); i++) {
45 if (formatCtx.streams(i).codec().codec_type() == avutil.AVMEDIA_TYPE_VIDEO) {
46 videoIndex = i;
47 break;
48 }
49 }
50
51 if (videoIndex == -1) {
52 System.out.println("Didn‘t find a video stream.\n");
53 return;
54 }
55
56 avcodec.AVCodecContext codecCtx = formatCtx.streams(videoIndex).codec();
57 avcodec.AVCodec codec = avcodec.avcodec_find_decoder(codecCtx.codec_id());
58 if (codec == null) {
59 System.out.println("Codec not found.\n");
60 return;
61 }
62
63 if (avcodec.avcodec_open2(codecCtx, codec, (AVDictionary) null) < 0) {
64 System.out.println("Could not open codec.\n");
65 }
66
67 avutil.AVFrame frame = avcodec.avcodec_alloc_frame();
68 avutil.AVFrame frameRGB = avcodec.avcodec_alloc_frame();
69
70 // 注意AVPicture的构造方法，参考http://blog.csdn.net/wahrlr/article/details/21970755
71 // 注意avutil.av_malloc的返回值（用Pointer代替uint8_t*）
72 int nunBytes = avcodec.avpicture_get_size(avutil.AV_PIX_FMT_RGB24, codecCtx.width(), codecCtx.height());
73 Pointer outBuffer = avutil.av_malloc(nunBytes);
74 avcodec.avpicture_fill(new AVPicture(frameRGB), outBuffer.asByteBuffer(), avutil.AV_PIX_FMT_RGB24, codecCtx.width(), codecCtx.height());
75
76 avformat.av_dump_format(formatCtx, 0, filePath, 0);
77
78 SwsContext img_convert_ctx = swscale.sws_getContext(codecCtx.width(), codecCtx.height(), codecCtx.pix_fmt(), codecCtx.width(), codecCtx.height(), avutil.AV_PIX_FMT_RGB24, swscale.SWS_BICUBIC, null, null, (double[])null);
79
80 AVPacket packet = new AVPacket();
81 int y_size = codecCtx.width() * codecCtx.height();
82 avcodec.av_new_packet(packet, y_size);
83 cvNamedWindow("butterfly.h264");
84 IplImage showImage = opencv_core.cvCreateImage(cvSize(codecCtx.width(),codecCtx.height()), IPL_DEPTH_8U, 3);
85 while(avformat.av_read_frame(formatCtx, packet) >= 0) {
86 if(packet.stream_index() == videoIndex) {
87 IntPointer ip = new IntPointer();
88 int ret = avcodec.avcodec_decode_video2(codecCtx, frame, ip, packet);
89 if(ret < 0) {
90 System.out.println("解码错误");
91 return;
92 }
93 if(ip.get() != 0) {
94 swscale.sws_scale(img_convert_ctx, frame.data(), frame.linesize(), 0, codecCtx.height(), frameRGB.data(), frameRGB.linesize());
95
96 showImage.imageData(frameRGB.data(0));
97 showImage.widthStep(frameRGB.linesize().get(0));
98
99 opencv_highgui.cvShowImage("butterfly.h264", showImage);
100 opencv_highgui.cvWaitKey(25);
101 }
102 }
103 avcodec.av_free_packet(packet);
104 }
105
106 showImage.release();
107 cvDestroyWindow("butterfly.h264");
108 avutil.av_free(frameRGB);
109 avcodec.avcodec_close(codecCtx);
110 avformat.avformat_close_input(formatCtx);
111 }
112
113 }
用JavaCV改写“100行代码实现最简单的基于FFMPEG+SDL的视频播放器 ”,码迷,mamicode.com