- 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udp
- av_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_ptr<AVFormatContext>(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_ptr<AVFrame>(frame, [](AVFrame* p) {av_frame_free(&p); });
- }
-
- if (!(pCodecCtx = avcodec_alloc_context3(pCodec)))
- {
- return -1;
- }
- m_spCodecContext = std::shared_ptr<AVCodecContext>(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;
- }
复制代码 avformat_find_stream_info 比较耗时,播放视频会比较慢,这里将他屏蔽掉,对播放视频没有影响
2:吸收数据
- void VideoDecodeModule::PushFrameQueue(std::shared_ptr<AVPacket> spPacket)
- {
- if (spPacket && !spPacket->size && spPacket->data)
- {
- return;
- }
- int ret = avcodec_send_packet(m_spCodecContext.get(), spPacket.get());
- if (ret < 0)
- {
- char errorbuf[1024] = { 0 };
- av_strerror(ret, errorbuf, sizeof(errorbuf));
- return;
- }
- while (true)
- {
- auto spFrame = std::shared_ptr<AVFrame>(av_frame_alloc(), [](AVFrame* p)
- {
- av_frame_free(&p);
- });
- if (!spFrame)
- {
- return;
- }
- ret = avcodec_receive_frame(m_spCodecContext.get(), spFrame.get());
- if (ret == AVERROR_EOF || ret == AVERROR(EAGAIN))
- {
- return;
- }
- if (ret < 0)
- {
- break;
- }
- if (m_decodeType == DT_INTER_QSV || m_decodeType == DT_NVIDIA_CUDA)
- {
- HandleHWVideoFrame(spFrame);
- }
- else if (m_decodeType == DT_CPU)
- {
- HandleVideoFrame(spFrame);
- }
- }
- }
复制代码 3:吸收视频帧
- void VideoDecodeModule::HandleVideoFrame(const std::shared_ptr<AVFrame>& spFrame)
- {
- if (!spFrame)
- return;
- //if (GetFrameExtra() % 6 != 0)
- // 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_ptr<SwsContext> 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, m_scaleWidth, m_scaleHeight, m_pixelFormat, SWS_FAST_BILINEAR, nullptr, nullptr, nullptr);
-
- SwsContext* image_sws_ctx = sws_getCachedContext(NULL, width, height, srcFmt, m_scaleWidth, m_scaleHeight, m_pixelFormat, SWS_FAST_BILINEAR, nullptr, nullptr, nullptr);
-
- spSwsContext = std::shared_ptr<SwsContext>(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_HwndShow)
- {
- m_spSdlRender->DrawFrame(spFrame.get());
- }
- /*if (m_HwndShow)
- {
- BYTE** data = spFrame->data;
- int* linesize = spFrame->linesize;
- m_SdlTexture = SDL_CreateTexture(m_SdlRender, SDL_PIXELFORMAT_IYUV, SDL_TEXTUREACCESS_STREAMING, width, height);
- SDL_UpdateYUVTexture(m_SdlTexture, NULL, data[0], linesize[0],
- data[1], linesize[1],
- data[2], linesize[2]);
- SDL_RenderClear(m_SdlRender);
- SDL_RenderCopy(m_SdlRender, m_SdlTexture, NULL, NULL);
- SDL_RenderPresent(m_SdlRender);
- }*/
- 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);
- }
- }
复制代码 工程:https://download.csdn.net/download/weixin_38887743/88748651
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