基于Cuda-ffmpeg的视频解码器
我开始实现custum视频解码器,该解码器利用cuda硬件解码器生成YUV帧,以便下一步对其进行编码 如何填写“CUVIDPICPARAMS”结构??? 可能吗 我的算法是: 对于获取视频流包,我使用ffmpeg-dev-libs-avcodec、avformat 我的步骤: 1) 打开输入文件:基于Cuda-ffmpeg的视频解码器,cuda,ffmpeg,nvidia,decoder,libav,Cuda,Ffmpeg,Nvidia,Decoder,Libav,我开始实现custum视频解码器,该解码器利用cuda硬件解码器生成YUV帧,以便下一步对其进行编码 如何填写“CUVIDPICPARAMS”结构??? 可能吗 我的算法是: 对于获取视频流包,我使用ffmpeg-dev-libs-avcodec、avformat 我的步骤: 1) 打开输入文件: avformat_open_input(&ff_formatContext,in_filename,nullptr,nullptr); 2) 获取视频流属性的: avformat_find_
avformat_open_input(&ff_formatContext,in_filename,nullptr,nullptr);
2) 获取视频流属性的:
avformat_find_stream_info(ff_formatContext,nullptr);
3) 获取视频流:
ff_video_stream=ff_formatContext->streams[i];
4) 获取CUDA设备并初始化它:
cuDeviceGet(&cu_device,0);
CUcontext cu_vid_ctx;
5) 初始化视频CUDA解码器并设置创建参数:
CUVIDDECODECREATEINFO *cu_decoder_info=new CUVIDDECODECREATEINFO;
memset(cu_decoder_info,0,sizeof(CUVIDDECODECREATEINFO));
...
cuvidCreateDecoder(cu_video_decoder,cu_decoder_info);
6) 将帧数据读取到AVP数据包
av_read_frame(ff_formatContext,ff_packet);
现在我需要在CUDA视频解码器上解码帧包,理论上是:
cuvidDecodePicture(pDecoder,&picParams);
但在我需要填充CUVIDPICPARAMS之前
CUVIDPICPARAMS picParams//=新CUVIDPICPARAMS;
memset(&picParams,0,sizeof(CUVIDPICPARAMS))
这就是
CUvideoparser
对象的用途。您通过cuvidParseVideoData
逐帧向它提供数据流,当它检测到它有一个完整的帧就绪时,它会用CUVIDPICPARAMS
将数据流传回给解码器
在D3D9解码示例(可用)中,所有这些以及更多都得到了很好的说明。我建议详细研究它,因为除此之外,没有太多关于此API的文档。您可能已经问过这个问题了。请不要再问了。你看过英伟达视频解码吗?是的,我用CUDA SDK的例子。但它使用专有的视频文件解析器。是的,我知道并使用D3D9解码样本,但我不使用CUvideoparser!我使用ffmpeg->AVpacket从视频源获取流包数据。所以我需要正确的填充CUVIDPICPARAMS。我是怎么知道ffmpeg的编解码器规范在CUVIDPICPARAMS struc中解析的?我对ffmpeg不太熟悉,但我假设您可以简单地将AVpacket的数据传递给CUvideoparser,它会为您填充CUVIDPICPARAMS。你有什么理由不使用它吗?CUvideoparser不会为我读取mkv视频文件,不同的文件-不同的容器,但如果我使用CUvideoparser应用程序,会在CUVideoParseVideoData(pParser,&cu_packet)步骤上崩溃。mkv与CUvideoparser无关,它是一个容器。您给CUvideoparser的是给定编码的视频帧(即H264、MPEG2等),它们来自何处并不重要。
HOW CAN I FILL "CUVIDPICPARAMS" struc ???
typedef struct _CUVIDPICPARAMS
{
int PicWidthInMbs; // Coded Frame Size
int FrameHeightInMbs; // Coded Frame Height
int CurrPicIdx; // Output index of the current picture
int field_pic_flag; // 0=frame picture, 1=field picture
int bottom_field_flag; // 0=top field, 1=bottom field (ignored if field_pic_flag=0)
int second_field; // Second field of a complementary field pair
// Bitstream data
unsigned int nBitstreamDataLen; // Number of bytes in bitstream data buffer
const unsigned char *pBitstreamData; // Ptr to bitstream data for this picture (slice-layer)
unsigned int nNumSlices; // Number of slices in this picture
const unsigned int *pSliceDataOffsets; // nNumSlices entries, contains offset of each slice within the bitstream data buffer
int ref_pic_flag; // This picture is a reference picture
int intra_pic_flag; // This picture is entirely intra coded
unsigned int Reserved[30]; // Reserved for future use
// Codec-specific data
union {
CUVIDMPEG2PICPARAMS mpeg2; // Also used for MPEG-1
CUVIDH264PICPARAMS h264;
CUVIDVC1PICPARAMS vc1;
CUVIDMPEG4PICPARAMS mpeg4;
CUVIDJPEGPICPARAMS jpeg;
unsigned int CodecReserved[1024];
} CodecSpecific;
} CUVIDPICPARAMS;
typedef struct _CUVIDH264PICPARAMS
{
// SPS
int log2_max_frame_num_minus4;
int pic_order_cnt_type;
int log2_max_pic_order_cnt_lsb_minus4;
int delta_pic_order_always_zero_flag;
int frame_mbs_only_flag;
int direct_8x8_inference_flag;
int num_ref_frames; // NOTE: shall meet level 4.1 restrictions
unsigned char residual_colour_transform_flag;
unsigned char bit_depth_luma_minus8; // Must be 0 (only 8-bit supported)
unsigned char bit_depth_chroma_minus8; // Must be 0 (only 8-bit supported)
unsigned char qpprime_y_zero_transform_bypass_flag;
// PPS
int entropy_coding_mode_flag;
int pic_order_present_flag;
int num_ref_idx_l0_active_minus1;
int num_ref_idx_l1_active_minus1;
int weighted_pred_flag;
int weighted_bipred_idc;
int pic_init_qp_minus26;
int deblocking_filter_control_present_flag;
int redundant_pic_cnt_present_flag;
int transform_8x8_mode_flag;
int MbaffFrameFlag;
int constrained_intra_pred_flag;
int chroma_qp_index_offset;
int second_chroma_qp_index_offset;
int ref_pic_flag;
int frame_num;
int CurrFieldOrderCnt[2];
// DPB
CUVIDH264DPBENTRY dpb[16]; // List of reference frames within the DPB
// Quantization Matrices (raster-order)
unsigned char WeightScale4x4[6][16];
unsigned char WeightScale8x8[2][64];
// FMO/ASO
unsigned char fmo_aso_enable;
unsigned char num_slice_groups_minus1;
unsigned char slice_group_map_type;
signed char pic_init_qs_minus26;
unsigned int slice_group_change_rate_minus1;
union
{
unsigned long long slice_group_map_addr;
const unsigned char *pMb2SliceGroupMap;
} fmo;
unsigned int Reserved[12];
// SVC/MVC
union
{
CUVIDH264MVCEXT mvcext;
CUVIDH264SVCEXT svcext;
};
} CUVIDH264PICPARAMS;