- /**
- *最简单的基于FFmpeg的图像编码器
- *Simplest FFmpeg Picture Encoder
- *
- *雷霄骅 Lei Xiaohua
- *leixiaohua1020@126.com
- *中国传媒大学/数字电视技术
- *Communication University of China / Digital TV Technology
- *http://blog.csdn.net/leixiaohua1020
- *
- *本程序实现了YUV420P像素数据编码为JPEG图片。是最简单的FFmpeg编码方面的教程。
- *通过学习本例子可以了解FFmpeg的编码流程。
- */
- #include "stdafx.h"
- extern "C"
- {
- #include <libavcodec\\avcodec.h>
- #include <libavformat\\avformat.h>
- #include <libswscale\\swscale.h>
- };
- int _tmain(int argc, _TCHAR* argv[])
- {
- AVFormatContext* pFormatCtx;
- AVOutputFormat* fmt;
- AVStream* video_st;
- AVCodecContext* pCodecCtx;
- AVCodec* pCodec;
- uint8_t* picture_buf;
- AVFrame* picture;
- int size;
- FILE *in_file = fopen("cuc_view_480x272.yuv", "rb"); //视频YUV源文件
- int in_w=480,in_h=272; //宽高
- const char* out_file = "cuc_view_encode.jpg"; //输出文件路径
- av_register_all();
- //方法1.组合使用几个函数
- pFormatCtx = avformat_alloc_context();
- //猜格式。用MJPEG编码
- fmt = av_guess_format("mjpeg", NULL, NULL);
- pFormatCtx->oformat = fmt;
- //注意:输出路径
- if (avio_open(&pFormatCtx->pb,out_file, AVIO_FLAG_READ_WRITE) < 0)
- {
- printf("输出文件打开失败");
- return -1;
- }
- //方法2.更加自动化一些
- //avformat_alloc_output_context2(&pFormatCtx, NULL, NULL, out_file);
- //fmt = pFormatCtx->oformat;
- video_st = av_new_stream(pFormatCtx, 0);
- if (video_st==NULL)
- {
- return -1;
- }
- pCodecCtx = video_st->codec;
- pCodecCtx->codec_id = fmt->video_codec;
- pCodecCtx->codec_type = AVMEDIA_TYPE_VIDEO;
- pCodecCtx->pix_fmt = PIX_FMT_YUVJ420P;
- pCodecCtx->width = in_w;
- pCodecCtx->height = in_h;
- pCodecCtx->time_base.num = 1;
- pCodecCtx->time_base.den = 25;
- //输出格式信息
- av_dump_format(pFormatCtx, 0, out_file, 1);
- pCodec = avcodec_find_encoder(pCodecCtx->codec_id);
- if (!pCodec)
- {
- printf("没有找到合适的编码器!");
- return -1;
- }
- if (avcodec_open2(pCodecCtx, pCodec,NULL) < 0)
- {
- printf("编码器打开失败!");
- return -1;
- }
- picture = avcodec_alloc_frame();
- size = avpicture_get_size(pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height);
- picture_buf = (uint8_t *)av_malloc(size);
- if (!picture_buf)
- {
- return -1;
- }
- avpicture_fill((AVPicture *)picture, picture_buf, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height);
- //写文件头
- avformat_write_header(pFormatCtx,NULL);
- AVPacket pkt;
- int y_size = pCodecCtx->width * pCodecCtx->height;
- av_new_packet(&pkt,y_size*3);
- //读入YUV
- if (fread(picture_buf, 1, y_size*3/2, in_file) < 0)
- {
- printf("文件读取错误");
- return -1;
- }
- picture->data[0] = picture_buf; // 亮度Y
- picture->data[1] = picture_buf+ y_size; // U
- picture->data[2] = picture_buf+ y_size*5/4; // V
- int got_picture=0;
- //编码
- int ret = avcodec_encode_video2(pCodecCtx, &pkt,picture, &got_picture);
- if(ret < 0)
- {
- printf("编码错误!\\n");
- return -1;
- }
- if (got_picture==1)
- {
- pkt.stream_index = video_st->index;
- ret = av_write_frame(pFormatCtx, &pkt);
- }
- av_free_packet(&pkt);
- //写文件尾
- av_write_trailer(pFormatCtx);
- printf("编码成功!\\n");
- if (video_st)
- {
- avcodec_close(video_st->codec);
- av_free(picture);
- av_free(picture_buf);
- }
- avio_close(pFormatCtx->pb);
- avformat_free_context(pFormatCtx);
- fclose(in_file);
- return 0;
- }
- //该片段来自于http://www.codesnippet.cn/detail/2512201411406.html
来源: http://www.codesnippet.cn/detail/2512201411406.html