Code

#include <stdio.h> #include <stdlib.h> #include <iostream> #include <fstream> #include <sstream> extern "C" { #include <libavcodec/avcodec.h> #include <libavformat/avformat.h> #include <libavformat/avio.h> #include <libswscale/swscale.h> } #define log(msg) std::wcout << L"[FFmpegRTSP] " << msg << std::endl << std::flush #define logError(msg)std:: wcout << L"[Error] [FFmpegRTSP] " << msg << std::endl << std::flush AVFormatContext* avFormatContext = nullptr; SwsContext *swsContext = nullptr; AVCodecContext* avCodecContext; AVCodec *codec = nullptr; int frameCount = 0; void writePPM(AVFrame* frameRGB, int fileSuffix) { std::stringstream file_name; std::ofstream output_file; file_name << "test" << fileSuffix << ".ppm"; output_file.open(file_name.str().c_str()); output_file << "P3 " << avCodecContext->width << " " << avCodecContext->height << " 255\n"; for (int y = 0; y < avCodecContext->height; y++) { for (int x = 0; x < avCodecContext->width * 3; x++) { output_file << (int)(frameRGB->data[0] + y * frameRGB->linesize[0])[x] << " "; } } output_file.close(); } int main(int argc, char** argv) { avFormatContext = avformat_alloc_context(); if (avformat_open_input(&avFormatContext, "rtsp://admin:123456@192.168.2.109:554/h264Preview_01_main", NULL, NULL) != 0) { logError("Failed to open Stream"); return EXIT_FAILURE; } if (avformat_find_stream_info(avFormatContext, NULL) < 0) { return EXIT_FAILURE; } int videoStreamIndex = -1; for (int i = 0; i < avFormatContext->nb_streams; i++) { if (avFormatContext->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) { videoStreamIndex = i; } } if (videoStreamIndex == -1) { return EXIT_FAILURE; } av_read_play(avFormatContext); codec = avcodec_find_decoder(AV_CODEC_ID_H264); if (!codec) { logError("H264 codec not found, compile FFmpeg with libopenh264 or libx264"); return EXIT_FAILURE; } avCodecContext = avcodec_alloc_context3(codec); avcodec_get_context_defaults3(avCodecContext, codec); avcodec_copy_context(avCodecContext, avFormatContext->streams[videoStreamIndex]->codec); if (avcodec_open2(avCodecContext, codec, NULL) != 0) { logError("Failed to open codec"); return EXIT_FAILURE; } int width = avCodecContext->width; int height = avCodecContext->height; swsContext = sws_getContext(width, height, avCodecContext->pix_fmt, width, height, AV_PIX_FMT_RGB24, SWS_BICUBIC, NULL, NULL, NULL); AVFrame* frame = av_frame_alloc(); frame->format = avCodecContext->pix_fmt; frame->width = width; frame->height = height; av_frame_get_buffer(frame, 0); AVFrame* frameRGB = av_frame_alloc(); frameRGB->format = AV_PIX_FMT_RGB24; frameRGB->width = width; frameRGB->height = height; av_frame_get_buffer(frameRGB, 0); AVPacket packet; av_init_packet(&packet); while (av_read_frame(avFormatContext, &packet) >= 0 && frameCount < 1000) { if (packet.stream_index == videoStreamIndex) { int gotFrame = 0; packet.stream_index = frameCount; int result = avcodec_decode_video2(avCodecContext, frame, &gotFrame, &packet); if (frameCount % 100 == 1 && gotFrame){ sws_scale(swsContext, frame->data, frame->linesize, 0, avCodecContext->height, frameRGB->data, frameRGB->linesize); writePPM(frameRGB, frameCount); } frameCount++; } av_free_packet(&packet); av_init_packet(&packet); } av_frame_free(&frame); av_frame_free(&frameRGB); av_read_pause(avFormatContext); avcodec_free_context(&avCodecContext); avformat_free_context(avFormatContext); return EXIT_SUCCESS; }
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