广州网站建设策划书,中国最大的软件开发公司,对公司网站建设的建议,在线直播官网下载的ffmpeg目前只能下载到X64版本的库#xff0c;具体编译请参考windows编译ffmpeg源码#xff08;32位库#xff09;_windows 32位ffmpeg动态库-CSDN博客
直接上代码
int VideoDecodeModule::Open(std::string strUrl)
{AVFormatContext *pFormatCtx nullptr;AVCo…官网下载的ffmpeg目前只能下载到X64版本的库具体编译请参考windows编译ffmpeg源码32位库_windows 32位ffmpeg动态库-CSDN博客
直接上代码
int VideoDecodeModule::Open(std::string strUrl)
{AVFormatContext *pFormatCtx nullptr;AVCodec *pCodec nullptr;AVCodecContext* pCodecCtx nullptr;AVDictionary *opt nullptr;std::string decodeName ;AVBufferRef* pBufferRef nullptr;int ret 0;int videoStream -1;char errorbuf[1024] { 0 };av_dict_set(opt, buffer_size, 1024000, 0); // 缓冲区大小 单位字节 解决高画质模糊的问题av_dict_set(opt, max_delay, 100, 0); // 最大延时 单位微妙av_dict_set(opt, stimeout, 3000000, 0); // 设置超时断开连接时间 3s 单位微妙av_dict_set(opt, rtsp_transport, tcp, 0); // 以tcp方式打开如果以udp方式打开将tcp替换为udpav_dict_set(opt, fflags, nobuffer, 0);av_dict_set(opt, rtbufsize, 6, 0);av_dict_set(opt, start_time_realtime, 0, 0);if ((ret avformat_open_input(pFormatCtx, strUrl.data(), nullptr, opt)) ! 0){av_strerror(ret, errorbuf, sizeof(errorbuf));return -1;}m_spFormatContext std::shared_ptrAVFormatContext(pFormatCtx, [](AVFormatContext* ctx){avformat_close_input(ctx);});if ((ret avformat_find_stream_info(pFormatCtx, nullptr)) 0){av_strerror(ret, errorbuf, sizeof(errorbuf));return -1;}if ((ret av_find_best_stream(pFormatCtx, AVMEDIA_TYPE_VIDEO, -1, -1, pCodec, 0)) 0){av_strerror(ret, errorbuf, sizeof(errorbuf));return -1;}videoStream ret;m_video pFormatCtx-streams[videoStream];if (m_decodeType DT_CPU){if (!(pCodec avcodec_find_decoder(m_video-codecpar-codec_id))){int error AVERROR(ENOMEM);return -1;}}else if (m_decodeType DT_INTER_QSV){decodeName GetCodeName(m_video-codecpar-codec_id, DT_INTER_QSV);if (av_hwdevice_ctx_create(pBufferRef, AV_HWDEVICE_TYPE_QSV, auto, nullptr, 0) ! 0){return -1;}if (!(pCodec avcodec_find_decoder_by_name(decodeName.data()))){int error AVERROR(ENOMEM);return -1;}}else if (m_decodeType DT_NVIDIA_CUDA){decodeName GetCodeName(m_video-codecpar-codec_id, DT_NVIDIA_CUDA);if (av_hwdevice_ctx_create(pBufferRef, AV_HWDEVICE_TYPE_CUDA, auto, nullptr, 0) ! 0){return -1;}if (!(pCodec avcodec_find_decoder_by_name(decodeName.data()))){int error AVERROR(ENOMEM);return -1;}}if (auto frame av_frame_alloc()){m_spSwFrame std::shared_ptrAVFrame(frame, [](AVFrame* p) {av_frame_free(p); });}if (!(pCodecCtx avcodec_alloc_context3(pCodec))){return -1;}m_spCodecContext std::shared_ptrAVCodecContext(pCodecCtx, [](AVCodecContext* ctx){avcodec_free_context(ctx);});m_spCodecContext-codec_id m_video-codecpar-codec_id;if (m_video-codecpar-extradata_size){m_spCodecContext-extradata (uint8_t*)av_mallocz(m_video-codecpar-extradata_size AV_INPUT_BUFFER_PADDING_SIZE);if (!m_spCodecContext-extradata){return -1;}memcpy(m_spCodecContext-extradata, m_video-codecpar-extradata, m_video-codecpar-extradata_size);m_spCodecContext-extradata_size m_video-codecpar-extradata_size;}m_spCodecContext-flags2 | AV_CODEC_FLAG2_FAST; // 允许不符合规范的加速技巧。m_spCodecContext-thread_count 8; // 使用8线程解码if ((ret avcodec_parameters_to_context(m_spCodecContext.get(), m_video-codecpar)) 0){av_strerror(ret, errorbuf, sizeof(errorbuf));return -1;}if (m_decodeType DT_INTER_QSV){m_spCodecContext-opaque pBufferRef;m_spCodecContext-get_format GetHWQsvFormat;}else if (m_decodeType DT_NVIDIA_CUDA){m_spCodecContext-hw_device_ctx av_buffer_ref(pBufferRef);m_spCodecContext-opaque this;m_spCodecContext-get_format GetHWCudaFormat;}if ((ret avcodec_open2(m_spCodecContext.get(), pCodec, nullptr)) 0){av_strerror(ret, errorbuf, sizeof(errorbuf));return -1;}m_isConnect true;return ret;
}
if (!spFrame)return;/// 解码的图片宽int width spFrame-width;/// 解码的图片高int height spFrame-height;// 计算转码后的图片裸数据需要的大小int nSrcbuffSize av_image_get_buffer_size(m_pixelFormat, width, height, 1);if (nSrcbuffSize m_dstBuffer.size()){m_dstBuffer.resize(nSrcbuffSize, \0);}std::shared_ptrSwsContext spSwsContext nullptr;/// 判断是否需要格式转换if (m_pixelFormat ! (AVPixelFormat)spFrame-format){AVPixelFormat srcFmt (AVPixelFormat)spFrame-format;SwsContext* image_sws_ctx sws_getContext(width, height, srcFmt,width, height, m_pixelFormat, SWS_FAST_BILINEAR, nullptr, nullptr, nullptr);spSwsContext std::shared_ptrSwsContext(image_sws_ctx, [](SwsContext* p) {sws_freeContext(p); });uint8_t* data[4] { nullptr };int linesize[4] { 0 };av_image_fill_arrays(data, linesize, m_dstBuffer.data(), m_pixelFormat, width, height, 1);int ret sws_scale(spSwsContext.get(), (uint8_t const* const*)spFrame-data, spFrame-linesize, 0, height, data, linesize);if (ret 0)return;}if (m_pFrameDataCallBack){FrameInfo info;info.format GetVideoFormatByAVPixelFormat(m_pixelFormat);info.width width;info.height height;info.pts spFrame-pts / 1000;m_pFrameDataCallBack-cbFrameDataCallBack(m_dstBuffer.data(), m_dstBuffer.size(), info, m_pFrameDataCallBack-pUser);}
解码显示效果图 英伟达显卡播放效果因本人没有显卡不在这里展示可以看出通过硬解降低将近一半的cpu。
代码参考 https://download.csdn.net/download/weixin_38887743/88748651
