git.sesse.net Git - casparcg/blob - modules/ffmpeg/producer/filter/filter.cpp

   1 #include "../../stdafx.h"\r
   2 \r
   3 #include "filter.h"\r
   4 \r
   5 #include "../../ffmpeg_error.h"\r
   6 \r
   7 #include <common/exception/exceptions.h>\r
   8 #include <core/producer/frame/basic_frame.h>\r
   9 #include <core/producer/frame/frame_factory.h>\r
  10 #include <core/mixer/write_frame.h>\r
  11 \r
  12 #include <boost/circular_buffer.hpp>\r
  13 \r
  14 #include <cstdio>\r
  15 #include <sstream>\r
  16 \r
  17 extern "C" \r
  18 {\r
  19         #define __STDC_CONSTANT_MACROS\r
  20         #define __STDC_LIMIT_MACROS\r
  21         #include <libavutil/avutil.h>\r
  22         #include <libavutil/imgutils.h>\r
  23         #include <libavfilter/avfilter.h>\r
  24         #include <libavfilter/avcodec.h>\r
  25         #include <libavfilter/vsrc_buffer.h>\r
  26         #include <libavfilter/avfiltergraph.h>\r
  27 }\r
  28 \r
  29 namespace caspar {\r
  30         \r
  31 struct filter::implementation\r
  32 {\r
  33         std::string                                                             filters_;\r
  34         std::shared_ptr<AVFilterGraph>                  graph_;\r
  35         AVFilterContext*                                                video_in_filter_;\r
  36         AVFilterContext*                                                video_out_filter_;\r
  37 \r
  38         implementation(const std::string& filters) \r
  39                 : filters_(filters)\r
  40         {\r
  41                 std::transform(filters_.begin(), filters_.end(), filters_.begin(), ::tolower);\r
  42         }\r
  43 \r
  44         void push(const safe_ptr<AVFrame>& frame)\r
  45         {               \r
  46                 int errn = 0;   \r
  47 \r
  48                 if(!graph_)\r
  49                 {\r
  50                         graph_.reset(avfilter_graph_alloc(), [](AVFilterGraph* p){avfilter_graph_free(&p);});\r
  51                         \r
  52                         // Input\r
  53                         std::stringstream buffer_ss;\r
  54                         buffer_ss << frame->width << ":" << frame->height << ":" << frame->format << ":" << 0 << ":" << 0 << ":" << 0 << ":" << 0; // don't care about pts and aspect_ratio\r
  55                         errn = avfilter_graph_create_filter(&video_in_filter_, avfilter_get_by_name("buffer"), "src", buffer_ss.str().c_str(), NULL, graph_.get());\r
  56                         if(errn < 0 || !video_in_filter_)\r
  57                         {\r
  58                                 BOOST_THROW_EXCEPTION(caspar_exception() <<     msg_info(av_error_str(errn)) <<\r
  59                                         boost::errinfo_api_function("avfilter_graph_create_filter") <<  boost::errinfo_errno(AVUNERROR(errn)));\r
  60                         }\r
  61 \r
  62                         // Output\r
  63                         errn = avfilter_graph_create_filter(&video_out_filter_, avfilter_get_by_name("nullsink"), "out", NULL, NULL, graph_.get());\r
  64                         if(errn < 0 || !video_out_filter_)\r
  65                         {\r
  66                                 BOOST_THROW_EXCEPTION(caspar_exception() <<     msg_info(av_error_str(errn)) <<\r
  67                                         boost::errinfo_api_function("avfilter_graph_create_filter") << boost::errinfo_errno(AVUNERROR(errn)));\r
  68                         }\r
  69                         \r
  70                         AVFilterInOut* outputs = reinterpret_cast<AVFilterInOut*>(av_malloc(sizeof(AVFilterInOut)));\r
  71                         AVFilterInOut* inputs  = reinterpret_cast<AVFilterInOut*>(av_malloc(sizeof(AVFilterInOut)));\r
  72 \r
  73                         outputs->name                   = av_strdup("in");\r
  74                         outputs->filter_ctx             = video_in_filter_;\r
  75                         outputs->pad_idx                = 0;\r
  76                         outputs->next                   = NULL;\r
  77 \r
  78                         inputs->name                    = av_strdup("out");\r
  79                         inputs->filter_ctx              = video_out_filter_;\r
  80                         inputs->pad_idx                 = 0;\r
  81                         inputs->next                    = NULL;\r
  82                         \r
  83                         errn = avfilter_graph_parse(graph_.get(), filters_.c_str(), inputs, outputs, NULL);\r
  84                         if(errn < 0)\r
  85                         {\r
  86                                 BOOST_THROW_EXCEPTION(caspar_exception() <<     msg_info(av_error_str(errn)) <<\r
  87                                         boost::errinfo_api_function("avfilter_graph_parse") << boost::errinfo_errno(AVUNERROR(errn)));\r
  88                         }\r
  89 \r
  90 //                      av_free(outputs);\r
  91 //                      av_free(inputs);\r
  92 \r
  93                         errn = avfilter_graph_config(graph_.get(), NULL);\r
  94                         if(errn < 0)\r
  95                         {\r
  96                                 BOOST_THROW_EXCEPTION(caspar_exception() <<     msg_info(av_error_str(errn)) \r
  97                                         <<      boost::errinfo_api_function("avfilter_graph_config") << boost::errinfo_errno(AVUNERROR(errn)));\r
  98                         }\r
  99                 }\r
 100         \r
 101                 errn = av_vsrc_buffer_add_frame(video_in_filter_, frame.get(), 0);\r
 102                 if(errn < 0)\r
 103                 {\r
 104                         BOOST_THROW_EXCEPTION(caspar_exception() << msg_info(av_error_str(errn)) <<\r
 105                                 boost::errinfo_api_function("av_vsrc_buffer_add_frame") << boost::errinfo_errno(AVUNERROR(errn)));\r
 106                 }\r
 107         }\r
 108 \r
 109         std::vector<safe_ptr<AVFrame>> poll()\r
 110         {\r
 111                 int errn = avfilter_poll_frame(video_out_filter_->inputs[0]);\r
 112                 if(errn < 0)\r
 113                 {\r
 114                         BOOST_THROW_EXCEPTION(caspar_exception() <<     msg_info(av_error_str(errn)) <<\r
 115                                 boost::errinfo_api_function("avfilter_poll_frame") << boost::errinfo_errno(AVUNERROR(errn)));\r
 116                 }\r
 117 \r
 118                 std::vector<safe_ptr<AVFrame>> result;\r
 119 \r
 120                 std::generate_n(std::back_inserter(result), errn, [&]{return request_frame();});\r
 121 \r
 122                 return result;\r
 123         }\r
 124                 \r
 125         safe_ptr<AVFrame> request_frame()\r
 126         {               \r
 127                 auto link = video_out_filter_->inputs[0];\r
 128                 \r
 129                 int errn = avfilter_request_frame(link);                        \r
 130                 if(errn < 0)\r
 131                 {\r
 132                         BOOST_THROW_EXCEPTION(caspar_exception() <<     msg_info(av_error_str(errn)) <<\r
 133                                 boost::errinfo_api_function("avfilter_request_frame") << boost::errinfo_errno(AVUNERROR(errn)));\r
 134                 }\r
 135                 \r
 136                 auto cur_buf = link->cur_buf;\r
 137                 auto pic = reinterpret_cast<AVPicture*>(link->cur_buf->buf);\r
 138                 \r
 139                 safe_ptr<AVFrame> frame(avcodec_alloc_frame(), [=](AVFrame* p)\r
 140                 {\r
 141                         av_free(p);\r
 142                         avfilter_unref_buffer(cur_buf);\r
 143                 });\r
 144 \r
 145                 avcodec_get_frame_defaults(frame.get());        \r
 146 \r
 147                 for(size_t n = 0; n < 4; ++n)\r
 148                 {\r
 149                         frame->data[n]          = pic->data[n];\r
 150                         frame->linesize[n]      = pic->linesize[n];\r
 151                 }\r
 152 \r
 153                 frame->width                    = link->cur_buf->video->w;\r
 154                 frame->height                   = link->cur_buf->video->h;\r
 155                 frame->format                   = link->cur_buf->format;\r
 156                 frame->interlaced_frame = link->cur_buf->video->interlaced;\r
 157                 frame->top_field_first  = link->cur_buf->video->top_field_first;\r
 158                 frame->key_frame                = link->cur_buf->video->key_frame;\r
 159 \r
 160                 return frame;\r
 161         }\r
 162 };\r
 163 \r
 164 filter::filter(const std::string& filters) : impl_(new implementation(filters)){}\r
 165 void filter::push(const safe_ptr<AVFrame>& frame) {impl_->push(frame);}\r
 166 std::vector<safe_ptr<AVFrame>> filter::poll() {return impl_->poll();}\r
 167 bool filter::is_ready() const{return impl_->graph_ != nullptr;}\r
 168 \r
 169 }