282 lines
7.8 KiB
C++
282 lines
7.8 KiB
C++
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//指定文件的编码为UTF-8
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#pragma execution_character_set("utf-8")
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#include "ReverseDecodThread.h"
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ReverseDecodThread::ReverseDecodThread()
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{
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qDebug() << "FFMPEG版本信息:" << av_version_info();
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}
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ReverseDecodThread::~ReverseDecodThread()
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{
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}
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/*
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功能: 设置媒体文件
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*/
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int ReverseDecodThread::set_VideoFile(QString media)
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{
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//打开媒体文件
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QByteArray array=media.toUtf8();
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strncpy(m_MediaFile, array.data(), sizeof(m_MediaFile));
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m_run = 1;
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return 1;
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}
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void ReverseDecodThread::SetSate(int run)
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{
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m_run = run;
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}
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int ReverseDecodThread::GetSate()
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{
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return m_run;
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}
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//跳转视频帧
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void ReverseDecodThread::SetSeekPos(qint64 pos)
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{
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is_CurrentSeekPos = 1;
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m_n64CurrentSeekPos = pos;
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m_run=1; //运行状态
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//获取系统本地时间
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play_base_time=QDateTime::currentMSecsSinceEpoch();
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}
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void ReverseDecodThread::PausePlay()
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{
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m_run = 2;
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}
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void ReverseDecodThread::StopPlay()
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{
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m_run = 0;
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}
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void ReverseDecodThread::LogSend(QString text)
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{
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//qDebug() << text;
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}
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//线程执行起点
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void ReverseDecodThread::run()
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{
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LogSend("开始播放视频.\n");
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StartPlay();
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}
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//播放视频
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int ReverseDecodThread::StartPlay()
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{
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format_ctx = avformat_alloc_context();
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if (!format_ctx) {
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LogSend(tr("初始化失败 无法打开视频文件: %1").arg(m_MediaFile));
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return -1;
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}
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//1.打开多媒体流,并且获取一些信息
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if(avformat_open_input(&format_ctx, m_MediaFile, nullptr, nullptr) != 0)
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{
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LogSend(tr("无法打开视频文件: %1").arg(m_MediaFile));
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return -1;
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}
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//2. 读取媒体文件的数据包以获取流信息
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if(avformat_find_stream_info(format_ctx, nullptr) < 0)
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{
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LogSend(tr("无法获取流信息.\n"));
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return -1;
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}
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// context = avcodec_alloc_context3(codec)
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AVCodecContext* avctx = avcodec_alloc_context3(NULL);
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if (nullptr == avctx) {
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return -1;
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}
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st_index[AVMEDIA_TYPE_VIDEO] = av_find_best_stream(format_ctx, AVMEDIA_TYPE_VIDEO, st_index[AVMEDIA_TYPE_VIDEO], -1, NULL, 0);
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st_index[AVMEDIA_TYPE_AUDIO] = av_find_best_stream(format_ctx, AVMEDIA_TYPE_AUDIO,
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st_index[AVMEDIA_TYPE_AUDIO],
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st_index[AVMEDIA_TYPE_VIDEO],
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NULL, 0);
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//3.打印视频的信息
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LogSend(tr("视频中流的数量: %1\n").arg(format_ctx->nb_streams));
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for(int i = 0; i < format_ctx->nb_streams; ++i)
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{
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const AVStream* stream = format_ctx->streams[i];
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if(stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
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{
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int ret = avcodec_parameters_to_context(avctx, stream->codecpar);
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if (ret < 0) {
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return -1;
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}
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//查找解码器
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const AVCodec *video_pCodec=avcodec_find_decoder(avctx->codec_id);
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//打开解码器
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if(avcodec_open2(avctx, video_pCodec,nullptr)!=0)
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{
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LogSend(tr("解码器打开失败.\n"));
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return -1;
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}
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video_stream_index = i;
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bool flag = false;
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if (video_width != stream->codecpar->width) {
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video_width = stream->codecpar->width;
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flag = true;
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}
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if (video_height != stream->codecpar->height) {
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video_height = stream->codecpar->height;
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flag = true;
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}
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if (flag) {
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emit VideoSizeChanged(video_width, video_height);
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}
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LogSend(tr("视频帧的尺寸(以像素为单位): (宽X高)%1x%2 像素格式: %3\n").arg(
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stream->codecpar->width).arg(stream->codecpar->height).arg(stream->codecpar->format));
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}
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}
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if (video_stream_index == -1)
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{
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LogSend("没有检测到视频流.\n");
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return -1;
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}
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AVRational frameRate = format_ctx->streams[video_stream_index]->avg_frame_rate;
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/*设置视频转码器*/
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SRC_VIDEO_pFrame = av_frame_alloc();
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RGB24_pFrame = av_frame_alloc();// 存放解码后YUV数据的缓冲区
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//将解码后的YUV数据转换成RGB24
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img_convert_ctx = sws_getContext(video_width, video_height,
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avctx->pix_fmt,video_width, video_height,
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AV_PIX_FMT_RGBA, SWS_BICUBIC, nullptr, nullptr, nullptr);
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//计算RGB图像所占字节大小
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int numBytes= av_image_get_buffer_size(AV_PIX_FMT_RGBA,video_width,video_height, 1);
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//申请空间存放RGB图像数据
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out_buffer_rgb = (uint8_t *) av_malloc(numBytes * sizeof(uint8_t));
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// avpicture_fill函数将ptr指向的数据填充到picture内,但并没有拷贝,只是将picture结构内的data指针指向了ptr的数据
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/*avpicture_fill((AVPicture *) RGB24_pFrame, out_buffer_rgb, AV_PIX_FMT_RGB24,
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video_width, video_height);*/
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av_image_fill_arrays(RGB24_pFrame->data, RGB24_pFrame->linesize, out_buffer_rgb, AV_PIX_FMT_RGBA,
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video_width, video_height, 1);
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qDebug()<<"format_ctx->duration:"<<format_ctx->duration;
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//获取系统本地时间
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play_base_time=QDateTime::currentMSecsSinceEpoch();
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// m_run = 1;
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//表示视频加载成功
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while(m_run)
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{
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if(m_run == 2)
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{
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msleep(100); //暂停播放
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continue;
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}
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if (is_CurrentSeekPos)
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{
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is_CurrentSeekPos = 0;
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//偏移到指定位置再开始解码 AVSEEK_FLAG_BACKWARD 向后找最近的关键帧
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av_seek_frame(format_ctx, -1, m_n64CurrentSeekPos* AV_TIME_BASE, AVSEEK_FLAG_BACKWARD);
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qDebug()<<"跳转的位置:"<<m_n64CurrentSeekPos;
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}
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double video_clock;
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AVPacket pkt;
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//1. 读取一帧数据
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if(av_read_frame(format_ctx, &pkt) < 0)
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{
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m_run=2; //设置为暂停状态
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// qDebug()<<"数据读取完毕.";
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continue;
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}
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if(pkt.stream_index == video_stream_index)
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{
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//当前时间
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video_clock = av_q2d(format_ctx->streams[video_stream_index]->time_base) * pkt.pts;
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// qDebug()<<"pkt.pts:"<<pkt.pts<<"video_clock:"<<video_clock;
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//解码视频 frame
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//2. 发送视频帧
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if (avcodec_send_packet(avctx,&pkt) != 0)
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{
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av_packet_unref(&pkt);//不成功就释放这个pkt
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continue;
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}
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//3. 接受后对视频帧进行解码
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if (avcodec_receive_frame(avctx, SRC_VIDEO_pFrame) != 0)
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{
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av_packet_unref(&pkt);//不成功就释放这个pkt
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continue;
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}
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//4. 转格式
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sws_scale(img_convert_ctx,
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(uint8_t const **) SRC_VIDEO_pFrame->data,
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SRC_VIDEO_pFrame->linesize, 0, video_height, RGB24_pFrame->data,
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RGB24_pFrame->linesize);
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//5. 加载图片数据
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QImage image(out_buffer_rgb,video_width,video_height,QImage::Format_RGBA8888);
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//通知界面更新
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VideoDataOutput(image.copy());
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//时间信号
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sig_getCurrentTime(video_clock, format_ctx->duration *1.0 / AV_TIME_BASE);
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QThread::msleep(40);
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}
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//释放包
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av_packet_unref(&pkt);
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}
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LogSend("视频音频解码播放器的线程退出成功.\n");
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if(SRC_VIDEO_pFrame) av_frame_free(&SRC_VIDEO_pFrame);
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if(RGB24_pFrame) av_frame_free(&RGB24_pFrame);
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if(img_convert_ctx)sws_freeContext(img_convert_ctx);
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if(out_buffer_rgb)av_free(out_buffer_rgb);
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SRC_VIDEO_pFrame=nullptr;
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RGB24_pFrame=nullptr;
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img_convert_ctx=nullptr;
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out_buffer_rgb=nullptr;
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if(format_ctx)
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{
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avcodec_free_context(&avctx);
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avformat_close_input(&format_ctx);//释放解封装器的空间，以防空间被快速消耗完
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avformat_free_context(format_ctx);
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}
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return 0;
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}
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