252 lines
8.1 KiB
C++
252 lines
8.1 KiB
C++
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// FFmpegDecoder.cpp
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#include "FFmpegDecoder.h"
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FFmpegDecoder::FFmpegDecoder(QObject* parent) :
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QThread(parent),
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videoLabel(nullptr),
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abort(false),
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restart(false),
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formatContext(nullptr),
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codecContext(nullptr),
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frame(nullptr),
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packet(nullptr),
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swsContext(nullptr),
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videoStreamIndex(-1) // 初始化成员变量
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{
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av_log_set_level(AV_LOG_QUIET); // 设置日志级别为安静模式
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avformat_network_init(); // 初始化网络
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}
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FFmpegDecoder::~FFmpegDecoder()
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{
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mutex.lock();
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abort = true;
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condition.wakeOne();
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mutex.unlock();
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wait();
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if (codecContext) {
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avcodec_free_context(&codecContext);
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}
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if (frame) {
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av_frame_free(&frame);
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}
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if (packet) {
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av_packet_free(&packet);
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}
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if (swsContext) {
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sws_freeContext(swsContext);
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}
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if (formatContext) {
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avformat_close_input(&formatContext);
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}
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avformat_network_deinit(); // 反初始化网络
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}
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void FFmpegDecoder::initialize()
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{
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// 初始化FFmpeg库
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avformat_network_init();
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}
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void FFmpegDecoder::decodeFile(const QString& filePath, QLabel* videoLabel)
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{
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QMutexLocker locker(&mutex);
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this->filePath = filePath;
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this->videoLabel = videoLabel;
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if (!isRunning()) {
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//start(LowPriority);
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start(NormalPriority);
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}
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restart = true;
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condition.wakeOne();
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}
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void FFmpegDecoder::run()
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{
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QFile file(filePath);
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qint64 fileSize = 0;
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for (;;) {
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mutex.lock();
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while (!restart && !abort) {
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condition.wait(&mutex);
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}
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if (abort) {
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mutex.unlock();
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break;
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}
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restart = false;
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QLabel* currentVideoLabel = videoLabel;
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QSize labelSize = currentVideoLabel->size();
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mutex.unlock();
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qDebug() << "Video label size: Width =" << labelSize.width() << ", Height =" << labelSize.height();
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if (!file.open(QIODevice::ReadOnly)) {
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qWarning() << "Failed to open file:" << filePath;
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continue;
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}
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// 从上次处理的位置开始读取
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file.seek(fileSize);
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formatContext = nullptr;
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codecContext = nullptr;
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frame = nullptr;
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packet = nullptr;
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// 通过 FFmpeg 初始化格式上下文和解码器
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if (avformat_open_input(&formatContext, filePath.toStdString().c_str(), nullptr, nullptr) != 0) {
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qWarning() << "Failed to open file with FFmpeg:" << filePath;
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file.close();
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continue;
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}
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if (avformat_find_stream_info(formatContext, nullptr) < 0) {
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qWarning() << "Failed to retrieve stream info";
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avformat_close_input(&formatContext);
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file.close();
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continue;
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}
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videoStreamIndex = -1;
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for (unsigned int i = 0; i < formatContext->nb_streams; ++i) {
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if (formatContext->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
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videoStreamIndex = i;
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break;
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}
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}
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if (videoStreamIndex == -1) {
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qWarning() << "No video stream found";
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avformat_close_input(&formatContext);
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file.close();
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continue;
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}
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AVCodecParameters* codecParameters = formatContext->streams[videoStreamIndex]->codecpar;
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const AVCodec* codec = avcodec_find_decoder(codecParameters->codec_id);
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if (!codec) {
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qWarning() << "Unsupported codec";
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avformat_close_input(&formatContext);
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file.close();
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continue;
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}
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codecContext = avcodec_alloc_context3(codec);
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if (!codecContext) {
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qWarning() << "Failed to allocate codec context";
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avformat_close_input(&formatContext);
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file.close();
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continue;
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}
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if (avcodec_parameters_to_context(codecContext, codecParameters) < 0) {
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qWarning() << "Failed to copy codec parameters to context";
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avcodec_free_context(&codecContext);
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avformat_close_input(&formatContext);
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file.close();
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continue;
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}
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if (avcodec_open2(codecContext, codec, nullptr) < 0) {
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qWarning() << "Failed to open codec";
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avcodec_free_context(&codecContext);
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avformat_close_input(&formatContext);
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file.close();
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continue;
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}
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frame = av_frame_alloc();
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packet = av_packet_alloc();
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// 主解码循环
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while (!abort) {
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qint64 currentFileSize = file.size();
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if (currentFileSize > fileSize) {
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fileSize = currentFileSize;
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file.seek(fileSize); // 设置文件读取位置到末尾
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// 读取并处理数据包
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while (av_read_frame(formatContext, packet) >= 0) {
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if (packet->stream_index == videoStreamIndex) {
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int ret = avcodec_send_packet(codecContext, packet);
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if (ret < 0) {
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qWarning() << "Error sending packet for decoding";
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av_packet_unref(packet);
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continue;
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}
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while (ret >= 0) {
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ret = avcodec_receive_frame(codecContext, frame);
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if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
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qWarning() << "----------- break";
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av_packet_unref(packet);
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continue;
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//break;
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}
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else if (ret < 0) {
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qWarning() << "Error during decoding";
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break;
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}
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/*mutex.lock();
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QSize labelSize = currentVideoLabel->size();
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mutex.unlock();*/
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//qDebug() << "Video label size: Width =" << labelSize.width() << ", Height =" << labelSize.height();
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QImage img = avFrameToQImage(frame);
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QImage scaledImage = img.scaled(labelSize, Qt::KeepAspectRatio, Qt::SmoothTransformation);
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currentVideoLabel->setPixmap(QPixmap::fromImage(scaledImage));
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//currentVideoLabel->setPixmap(QPixmap::fromImage(img));
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QThread::msleep(10); // Simulate 25 FPS frame rate
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}
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}
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av_packet_unref(packet);
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}
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}
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mutex.lock();
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if (restart) {
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restart = false;
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mutex.unlock();
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break;
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}
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mutex.unlock();
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}
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avcodec_free_context(&codecContext);
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avformat_close_input(&formatContext);
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av_frame_free(&frame);
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av_packet_free(&packet);
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file.close();
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sws_freeContext(swsContext);
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mutex.lock();
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if (!restart) {
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condition.wait(&mutex);
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}
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mutex.unlock();
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}
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}
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QImage FFmpegDecoder::avFrameToQImage(AVFrame* frame)
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{
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int width = frame->width;
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int height = frame->height;
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AVPixelFormat pixFmt = (AVPixelFormat)frame->format;
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SwsContext* swsCtx = sws_getContext(width, height, pixFmt, width, height, AV_PIX_FMT_RGB24, SWS_BILINEAR, nullptr, nullptr, nullptr);
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if (!swsCtx) {
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qWarning() << "Failed to initialize the conversion context";
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return QImage();
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}
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QImage img(width, height, QImage::Format_RGB888);
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uint8_t* dest[4] = { img.bits(), nullptr, nullptr, nullptr };
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int destLinesize[4] = { img.bytesPerLine(), 0, 0, 0 };
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sws_scale(swsCtx, frame->data, frame->linesize, 0, height, dest, destLinesize);
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sws_freeContext(swsCtx);
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return img;
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}
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