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#include "cffmpeg_decode.h"
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// Cffmpeg_decode::Cffmpeg_decode() {
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Cffmpeg_decode::Cffmpeg_decode(QObject *parent) : QObject(parent) {
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inputFormatCtx = avformat_alloc_context();
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outputFormatCtx = avformat_alloc_context();
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inputPacket = av_packet_alloc();
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outputPacket = av_packet_alloc();
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yuvFrame = av_frame_alloc();
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rgbFrame = av_frame_alloc();
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avformat_network_init();
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}
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Cffmpeg_decode::~Cffmpeg_decode() {
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if (!inputPacket)
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av_packet_free(&inputPacket);
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if (!outputPacket)
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av_packet_free(&outputPacket);
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if (!yuvFrame)
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av_frame_free(&yuvFrame);
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if (!rgbFrame)
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av_frame_free(&rgbFrame);
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if (!encoderCtx)
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avcodec_free_context(&encoderCtx);
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if (!encoderCtx)
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avcodec_close(encoderCtx);
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if (!decoderCtx)
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avcodec_free_context(&decoderCtx);
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if (!decoderCtx)
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avcodec_close(decoderCtx);
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if (!inputFormatCtx)
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avformat_close_input(&inputFormatCtx);
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if (!outputFormatCtx)
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avformat_close_input(&outputFormatCtx);
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}
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void Cffmpeg_decode::setUrl(QString url) { _url = url; }
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bool Cffmpeg_decode::open_input_file() {
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if (_url.isEmpty())
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return 0;
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//========================解码============================
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AVDictionary *avdic = NULL;
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// 设置缓存大小，1080p可将值调大
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av_dict_set(&avdic, "buffer_size", "2048000", 0);
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// 以udp方式打开，如果以tcp方式打开将udp替换为tcp
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av_dict_set(&avdic, "rtsp_transport", "udp", 0);
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// 设置超时断开连接时间，单位微秒//listen_timeout
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//av_dict_set(&avdic, "listen_timeout", "200000", 0);
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av_dict_set(&avdic, "stimeout", "200000", 0);
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av_dict_set(&avdic, "max_delay", "3", 0); // 设置最大时延
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av_dict_set(&avdic, "tune", "zerolatency", 0);
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av_dict_set(&avdic, "preset", "ultrafast", 0);
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inputFormatCtx->flags |= AVFMT_FLAG_NONBLOCK;
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// 打开输入流
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if (avformat_open_input(&inputFormatCtx, _url.toUtf8().data(), NULL, &avdic) <0) {
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printf("Cannot open input file.\n");
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return 0;
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}
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// 查找流信息
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if (avformat_find_stream_info(inputFormatCtx, NULL) < 0) {
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printf("Cannot find any stream in file.\n");
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return 0;
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}
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// 从输入流中找到第一个视频流
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for (int i = 0; i < inputFormatCtx->nb_streams; i++) {
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if (inputFormatCtx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
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videoStreamIndex = i;
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continue;
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}
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}
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if (videoStreamIndex == -1) {
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printf("Cannot find video stream in file.\n");
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return 0;
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}
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// 获取视频流的解码器参数
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videoCodecPara = inputFormatCtx->streams[videoStreamIndex]->codecpar;
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decoder = avcodec_find_decoder(videoCodecPara->codec_id);
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if (!decoder) {
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printf("Cannot find valid decode codec.\n");
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return 0;
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}
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// 为解码器上下文分配空间
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decoderCtx = avcodec_alloc_context3(decoder);
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if (!decoderCtx) {
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printf("Cannot find valid decode codec context.\n");
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return 0;
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}
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// 初始化解码器上下文
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if (avcodec_parameters_to_context(decoderCtx, videoCodecPara) < 0) {
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printf("Cannot initialize parameters.\n");
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return 0;
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}
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// 打开解码器
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if (avcodec_open2(decoderCtx, decoder, NULL) < 0) {
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printf("Cannot open codec.\n");
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return 0;
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}
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//===============================编码================================
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// 1、输出文件设置
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if (avformat_alloc_output_context2(&outputFormatCtx, NULL, NULL, "output_video.mp4") < 0) {
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qDebug() << "Could not create output context.\n";
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return 0;
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}
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// 从输入流中找到第一个视频流
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for (int i = 0; i < inputFormatCtx->nb_streams; i++) {
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if (inputFormatCtx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
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videoStreamIndexOut = i;
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continue;
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}
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}
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if (videoStreamIndexOut == -1) {
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printf("Cannot find video stream in file.\n");
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return 0;
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}
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// 获取视频流的解码器参数
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videoCodecPara2 = inputFormatCtx->streams[videoStreamIndexOut]->codecpar;
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// 3、创建输出视频流
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outStream = avformat_new_stream(outputFormatCtx, NULL);
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if (!outStream) {
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qDebug() << "Failed allocating output stream.\n";
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return 0;
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}
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//4、查找编码器
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encoder = avcodec_find_encoder(videoCodecPara2->codec_id);
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if(!encoder){
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return 0;
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}
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//5、分配解码器上下文
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encoderCtx = avcodec_alloc_context3(encoder);
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if (!encoderCtx) {
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return 0;
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}
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//初始化视频AVCodecContext
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encoderCtx->height = videoCodecPara2->height;
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encoderCtx->width = videoCodecPara2->width;
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videoCodecPara2->framerate = av_guess_frame_rate(inputFormatCtx,inputFormatCtx->streams[videoStreamIndexOut],NULL);
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//视频流的时间基是1 / 帧率
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encoderCtx->time_base = av_inv_q(inputFormatCtx->streams[videoStreamIndexOut]->codecpar->framerate);
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encoderCtx->sample_aspect_ratio = inputFormatCtx->streams[videoStreamIndexOut]->codecpar->sample_aspect_ratio;
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if (encoder->pix_fmts)
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{
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encoderCtx->pix_fmt = encoder->pix_fmts[0];
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}
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encoderCtx->codec_type = AVMEDIA_TYPE_VIDEO;
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encoderCtx->codec_id = AV_CODEC_ID_H264;
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encoderCtx->bit_rate = 2000000;
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encoderCtx->time_base.num = 1;
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encoderCtx->time_base.den = 20;
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//全局头
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if (outputFormatCtx->oformat->flags & AVFMT_GLOBALHEADER)
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{
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encoderCtx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
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}
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// //设置选项
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// AVDictionary *param = 0;
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// //H.264
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// if(videoCodecPara->codec_id == AV_CODEC_ID_H264) {
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// av_dict_set(¶m, "preset", "slow", 0);
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// av_dict_set(¶m, "tune", "zerolatency", 0);
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// av_dict_set(¶m, "profile", "main", 0);
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// }
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// //H.265
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// if(videoCodecPara->codec_id == AV_CODEC_ID_H265){
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// av_dict_set(¶m, "preset", "ultrafast", 0);
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// av_dict_set(¶m, "tune", "zero-latency", 0);
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// }
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//6、打开编码器
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if (avcodec_open2(encoderCtx, encoder, NULL) < 0) {
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qDebug() << "Error occurred when opening encoder.\n";
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//return 0;
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}
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avcodec_parameters_from_context(outputFormatCtx->streams[0]->codecpar, encoderCtx);
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//avcodec_parameters_to_context(encoderCtx,outStream->codecpar);
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// 打开输出文件
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if (!(outputFormatCtx->oformat->flags & AVFMT_NOFILE)) {
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if (avio_open(&outputFormatCtx->pb,
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outputFormatCtx->url /* "output_video.mp4"*/,
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AVIO_FLAG_WRITE) < 0) {
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printf("Could not open output file.\n");
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return 0;
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}
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}
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//写入输出文件的头信息
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if (avformat_write_header(outputFormatCtx, NULL) < 0) {
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qDebug() << "Error occurred when opening output file.\n";
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//return 0;
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}
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//格式化输出输出文件信息
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av_dump_format(outputFormatCtx,0,outputFormatCtx->url,1);
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// 初始化图像转换器
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swsCtx = sws_getContext(decoderCtx->width, //
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decoderCtx->height, //
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decoderCtx->pix_fmt, //
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decoderCtx->width, //
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decoderCtx->height, //
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AV_PIX_FMT_RGB32, //
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SWS_BICUBIC, NULL, NULL, NULL);
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numBytes = av_image_get_buffer_size(AV_PIX_FMT_RGB32, //
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decoderCtx->width, //
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decoderCtx->height, //
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1);
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out_buffer = (unsigned char *)av_malloc(numBytes * sizeof(unsigned char));
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int res = av_image_fill_arrays(rgbFrame->data, //
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rgbFrame->linesize, //
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out_buffer, //
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AV_PIX_FMT_RGB32, //
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decoderCtx->width, //
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decoderCtx->height, 1);
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if (res < 0) {
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qDebug() << "Fill arrays failed.\n";
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return 0;
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}
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return true;
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}
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// 线程里持续执行
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void Cffmpeg_decode::run() {
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if (!open_input_file()) {
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qDebug() << "Please open video file first.";
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emit sendConnectFail(1);
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IsstopPlay = true;
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return;
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}
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// 读取数据包
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while (av_read_frame(inputFormatCtx, inputPacket) >= 0) {
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if (IsstopPlay) {
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qDebug() << "video play stop";
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break;
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}
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if (inputPacket->stream_index == videoStreamIndex) {
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// 解码数据包
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if (avcodec_send_packet(decoderCtx, inputPacket) >= 0) {
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int ret;
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while ((ret = avcodec_receive_frame(decoderCtx, yuvFrame)) >= 0) {
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if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
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return;
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} else if (ret < 0) {
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fprintf(stderr, "Error during decoding\n");
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exit(1);
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}
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sws_scale(swsCtx, //
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yuvFrame->data, //
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yuvFrame->linesize, //
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0, //
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decoderCtx->height, //
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rgbFrame->data, //
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rgbFrame->linesize);
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QImage img(out_buffer, //
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decoderCtx->width, //
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decoderCtx->height, //
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QImage::Format_RGB32);
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emit sendQImage(img);
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QThread::msleep(28);
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//将解码后的帧写入输出文件
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if (av_write_frame(outputFormatCtx, inputPacket) < 0) {
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//qDebug() << "Error muxing packet.\n";
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break;
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}
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}
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}
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av_packet_unref(inputPacket);
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}
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//花屏
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// if (av_read_frame(inputFormatCtx, inputPacket) < 0) {
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// break; // 达到文件末尾
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// }
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}
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}
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// 退出
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void Cffmpeg_decode::stop() {
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// 写入输出文件的尾信息
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// av_write_trailer(outputFormatCtx);
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IsstopPlay = true;
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if (!inputPacket)
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av_packet_free(&inputPacket);
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if (!outputPacket)
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av_packet_free(&outputPacket);
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if (!yuvFrame)
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av_frame_free(&yuvFrame);
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if (!rgbFrame)
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av_frame_free(&rgbFrame);
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if (!encoderCtx)
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avcodec_free_context(&encoderCtx);
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if (!encoderCtx)
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avcodec_close(encoderCtx);
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if (!decoderCtx)
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avcodec_free_context(&decoderCtx);
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if (!decoderCtx)
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avcodec_close(decoderCtx);
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if (!inputFormatCtx)
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avformat_close_input(&inputFormatCtx);
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if (!outputFormatCtx)
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avformat_close_input(&outputFormatCtx);
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}
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