vendor: OpenCV 5.0.0 snapshot at 755e50675d97db9b7d449d8bd6b09888646f6c6e

2026-08-22 00:11:13 +08:00
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+/*M///////////////////////////////////////////////////////////////////////////////////////
+//
+//  IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
+//
+//  By downloading, copying, installing or using the software you agree to this license.
+//  If you do not agree to this license, do not download, install,
+//  copy or use the software.
+//
+//
+//                          License Agreement
+//                For Open Source Computer Vision Library
+//
+// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
+// Copyright (C) 2009, Willow Garage Inc., all rights reserved.
+// Copyright (C) 2013, OpenCV Foundation, all rights reserved.
+// Third party copyrights are property of their respective owners.
+//
+// Redistribution and use in source and binary forms, with or without modification,
+// are permitted provided that the following conditions are met:
+//
+//   * Redistribution's of source code must retain the above copyright notice,
+//     this list of conditions and the following disclaimer.
+//
+//   * Redistribution's in binary form must reproduce the above copyright notice,
+//     this list of conditions and the following disclaimer in the documentation
+//     and/or other materials provided with the distribution.
+//
+//   * The name of the copyright holders may not be used to endorse or promote products
+//     derived from this software without specific prior written permission.
+//
+// This software is provided by the copyright holders and contributors "as is" and
+// any express or implied warranties, including, but not limited to, the implied
+// warranties of merchantability and fitness for a particular purpose are disclaimed.
+// In no event shall the Intel Corporation or contributors be liable for any direct,
+// indirect, incidental, special, exemplary, or consequential damages
+// (including, but not limited to, procurement of substitute goods or services;
+// loss of use, data, or profits; or business interruption) however caused
+// and on any theory of liability, whether in contract, strict liability,
+// or tort (including negligence or otherwise) arising in any way out of
+// the use of this software, even if advised of the possibility of such damage.
+//
+//M*/
+
+#include "precomp.hpp"
+
+#ifdef HAVE_NVCUVID
+using namespace cv;
+using namespace cv::cudacodec;
+using namespace cv::cudacodec::detail;
+
+#ifndef CV_FOURCC_MACRO
+#define CV_FOURCC_MACRO(c1, c2, c3, c4) (((c1) & 255) + (((c2) & 255) << 8) + (((c3) & 255) << 16) + (((c4) & 255) << 24))
+#endif
+
+static std::string fourccToString(int fourcc)
+{
+    char str[5] = {'\0', '\0', '\0', '\0'};
+    for (int i = 0; i < 4; i++) {
+        char c = (char)(fourcc >> i*8);
+        str[i] = ' ' <= c && c < 128 ? c : '?';
+    }
+    return std::string(str);
+}
+
+static
+Codec FourccToCodec(int codec)
+{
+    switch (codec)
+    {
+    case CV_FOURCC_MACRO('m', 'p', 'g', '1'): return MPEG1;
+    case CV_FOURCC_MACRO('m', 'p', 'g', '2'): return MPEG2;
+    case CV_FOURCC_MACRO('F', 'M', 'P', '4'): return MPEG4;
+    case CV_FOURCC_MACRO('W', 'V', 'C', '1'): return VC1;
+    case CV_FOURCC_MACRO('h', '2', '6', '4'): return H264;
+    case CV_FOURCC_MACRO('h', 'e', 'v', 'c'): return HEVC;
+    case CV_FOURCC_MACRO('M', 'J', 'P', 'G'): return JPEG;
+    case CV_FOURCC_MACRO('V', 'P', '8', '0'): return VP8;
+    case CV_FOURCC_MACRO('V', 'P', '9', '0'): return VP9;
+    case CV_FOURCC_MACRO('A', 'V', '0', '1'): return AV1;
+    default:
+        break;
+    }
+    std::string msg = cv::format("Unknown codec FOURCC: 0x%08X (%s)", codec, fourccToString(codec).c_str());
+    CV_LOG_WARNING(NULL, msg);
+    CV_Error(Error::StsUnsupportedFormat, msg);
+}
+
+static
+int StartCodeLen(unsigned char* data, const int sz) {
+    if (sz >= 3 && data[0] == 0 && data[1] == 0 && data[2] == 1)
+        return 3;
+    else if (sz >= 4 && data[0] == 0 && data[1] == 0 && data[2] == 0 && data[3] == 1)
+        return 4;
+    else
+        return 0;
+}
+
+bool ParamSetsExist(unsigned char* parameterSets, const int szParameterSets, unsigned char* data, const int szData) {
+    const int paramSetStartCodeLen = StartCodeLen(parameterSets, szParameterSets);
+    const int packetStartCodeLen = StartCodeLen(data, szData);
+    // weak test to see if the parameter set has already been included in the RTP stream
+    return paramSetStartCodeLen != 0 && packetStartCodeLen != 0 && parameterSets[paramSetStartCodeLen] == data[packetStartCodeLen];
+}
+
+cv::cudacodec::detail::FFmpegVideoSource::FFmpegVideoSource(const String& fname, const std::vector<int>& _videoCaptureParams, const int iMaxStartFrame)
+    : videoCaptureParams(_videoCaptureParams)
+{
+    if (!videoio_registry::hasBackend(CAP_FFMPEG))
+        CV_Error(Error::StsNotImplemented, "FFmpeg backend not found");
+
+    videoCaptureParams.push_back(CAP_PROP_FORMAT);
+    videoCaptureParams.push_back(-1);
+    if (!cap.open(fname, CAP_FFMPEG, videoCaptureParams))
+        CV_Error(Error::StsUnsupportedFormat, "Unsupported video source");
+    CV_Assert(cap.get(CAP_PROP_FORMAT) == -1);
+    if (iMaxStartFrame) {
+        CV_Assert(cap.set(CAP_PROP_POS_FRAMES, iMaxStartFrame));
+        firstFrameIdx = static_cast<int>(cap.get(CAP_PROP_POS_FRAMES));
+    }
+
+    const int codecExtradataIndex = static_cast<int>(cap.get(CAP_PROP_CODEC_EXTRADATA_INDEX));
+    Mat tmpExtraData;
+    if (cap.retrieve(tmpExtraData, codecExtradataIndex) && tmpExtraData.total())
+        extraData = tmpExtraData.clone();
+
+    int codec = (int)cap.get(CAP_PROP_FOURCC);
+    format_.codec = FourccToCodec(codec);
+    format_.height = cap.get(CAP_PROP_FRAME_HEIGHT);
+    format_.width = cap.get(CAP_PROP_FRAME_WIDTH);
+    format_.displayArea = Rect(0, 0, format_.width, format_.height);
+    format_.valid = false;
+    format_.fps = cap.get(CAP_PROP_FPS);
+}
+
+cv::cudacodec::detail::FFmpegVideoSource::~FFmpegVideoSource()
+{
+    if (cap.isOpened())
+        cap.release();
+}
+
+FormatInfo cv::cudacodec::detail::FFmpegVideoSource::format() const
+{
+    return format_;
+}
+
+void cv::cudacodec::detail::FFmpegVideoSource::updateFormat(const FormatInfo& videoFormat)
+{
+    format_ = videoFormat;
+    format_.valid = true;
+}
+
+bool cv::cudacodec::detail::FFmpegVideoSource::get(const int propertyId, double& propertyVal) const
+{
+    propertyVal = cap.get(propertyId);
+    if (propertyVal != CAP_PROP_UNKNOWN)
+        return true;
+
+    CV_Assert(videoCaptureParams.size() % 2 == 0);
+    for (std::size_t i = 0; i < videoCaptureParams.size(); i += 2) {
+        if (videoCaptureParams.at(i) == propertyId) {
+            propertyVal = videoCaptureParams.at(i + 1);
+            return true;
+        }
+    }
+
+    return false;
+}
+
+bool cv::cudacodec::detail::FFmpegVideoSource::getNextPacket(unsigned char** data, size_t* size)
+{
+    cap >> rawFrame;
+    *data = rawFrame.data;
+    *size = rawFrame.total();
+    if (iFrame++ == 0 && extraData.total()) {
+        if (format_.codec == Codec::MPEG4 ||
+            ((format_.codec == Codec::H264 || format_.codec == Codec::HEVC) && !ParamSetsExist(extraData.data, extraData.total(), *data, *size)))
+        {
+            const size_t nBytesToTrimFromData = format_.codec == Codec::MPEG4 ? 3 : 0;
+            const size_t newSz = extraData.total() + *size - nBytesToTrimFromData;
+            dataWithHeader = Mat(1, newSz, CV_8UC1);
+            memcpy(dataWithHeader.data, extraData.data, extraData.total());
+            memcpy(dataWithHeader.data + extraData.total(), (*data) + nBytesToTrimFromData, *size - nBytesToTrimFromData);
+            *data = dataWithHeader.data;
+            *size = newSz;
+        }
+    }
+
+    return *size != 0;
+}
+
+bool cv::cudacodec::detail::FFmpegVideoSource::lastPacketContainsKeyFrame() const
+{
+    return cap.get(CAP_PROP_LRF_HAS_KEY_FRAME);
+}
+
+#endif // HAVE_CUDA