最简单的基于FFmpeg的编码器-纯净版（不包含libavformat）

/** * 最简单的基于FFmpeg的视频编码器（纯净版） * Simplest FFmpeg Video Encoder Pure * * 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YUV像素数据编码为视频码流（H264，MPEG2，VP8等等）。 * 它仅仅使用了libavcodec（而没有使用libavformat）。 * 是最简单的FFmpeg视频编码方面的教程。 * 通过学习本例子可以了解FFmpeg的编码流程。 * This software encode YUV420P data to video bitstream * (Such as H.264, H.265, VP8, MPEG2 etc). * It only uses libavcodec to encode video (without libavformat) * It's the simplest video encoding software based on FFmpeg. * Suitable for beginner of FFmpeg */ #include <stdio.h> extern "C" { #include "libavutilopt.h" #include "libavcodecavcodec.h" #include "libavutilimgutils.h" }; //test different codec #define TEST_H264 0 #define TEST_HEVC 1 int main(int argc, char* argv[]) { AVCodec *pCodec; AVCodecContext *pCodecCtx= NULL; int i, ret, x, y, got_output; FILE *fp_in; FILE *fp_out; AVFrame *pFrame; AVPacket pkt; int y_size; int framecnt=0; char filename_in[]="../ds_480x272.yuv"; #if TEST_HEVC AVCodecID codec_id=AV_CODEC_ID_HEVC; char filename_out[]="ds.hevc"; #else AVCodecID codec_id=AV_CODEC_ID_H264; char filename_out[]="ds.h264"; #endif int in_w=480,in_h=272; int framenum=100; avcodec_register_all(); pCodec = avcodec_find_encoder(codec_id); if (!pCodec) { printf("Codec not found "); return ⑴; } pCodecCtx = avcodec_alloc_context3(pCodec); if (!pCodecCtx) { printf("Could not allocate video codec context "); return ⑴; } pCodecCtx->bit_rate = 400000; pCodecCtx->width = in_w; pCodecCtx->height = in_h; pCodecCtx->time_base.num=1; pCodecCtx->time_base.den=25; pCodecCtx->gop_size = 10; pCodecCtx->max_b_frames = 1; pCodecCtx->pix_fmt = AV_PIX_FMT_YUV420P; if (codec_id == AV_CODEC_ID_H264) av_opt_set(pCodecCtx->priv_data, "preset", "slow", 0); if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0) { printf("Could not open codec "); return ⑴; } pFrame = av_frame_alloc(); if (!pFrame) { printf("Could not allocate video frame "); return ⑴; } pFrame->format = pCodecCtx->pix_fmt; pFrame->width = pCodecCtx->width; pFrame->height = pCodecCtx->height; ret = av_image_alloc(pFrame->data, pFrame->linesize, pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, 16); if (ret < 0) { printf("Could not allocate raw picture buffer "); return ⑴; } //Input raw data fp_in = fopen(filename_in, "rb"); if (!fp_in) { printf("Could not open %s ", filename_in); return ⑴; } //Output bitstream fp_out = fopen(filename_out, "wb"); if (!fp_out) { printf("Could not open %s ", filename_out); return ⑴; } y_size = pCodecCtx->width * pCodecCtx->height; //Encode for (i = 0; i < framenum; i++) { av_init_packet(&pkt); pkt.data = NULL; // packet data will be allocated by the encoder pkt.size = 0; //Read raw YUV data if (fread(pFrame->data[0],1,y_size,fp_in)< 0|| // Y fread(pFrame->data[1],1,y_size/4,fp_in)< 0|| // U fread(pFrame->data[2],1,y_size/4,fp_in)< 0){ // V return ⑴; }else if(feof(fp_in)){ break; } pFrame->pts = i; /* encode the image */ ret = avcodec_encode_video2(pCodecCtx, &pkt, pFrame, &got_output); if (ret < 0) { printf("Error encoding frame "); return ⑴; } if (got_output) { printf("Succeed to encode frame: %5d size:%5d ",framecnt,pkt.size); framecnt++; fwrite(pkt.data, 1, pkt.size, fp_out); av_free_packet(&pkt); } } //Flush Encoder for (got_output = 1; got_output; i++) { ret = avcodec_encode_video2(pCodecCtx, &pkt, NULL, &got_output); if (ret < 0) { printf("Error encoding frame "); return ⑴; } if (got_output) { printf("Flush Encoder: Succeed to encode 1 frame! size:%5d ",pkt.size); fwrite(pkt.data, 1, pkt.size, fp_out); av_free_packet(&pkt); } } fclose(fp_out); avcodec_close(pCodecCtx); av_free(pCodecCtx); av_freep(&pFrame->data[0]); av_frame_free(&pFrame); return 0; }

//test different codec #define TEST_H264 0 #define TEST_HEVC 1