static int configure_video_filters(AVFilterGraph *graph, VideoState *is, const char *vfilters) { static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE }; char sws_flags_str[128]; char buffersrc_args[256]; int ret; AVBufferSinkParams *buffersink_params = av_buffersink_params_alloc(); AVFilterContext *filt_src = NULL, *filt_out = NULL, *filt_format, *filt_crop; AVCodecContext *codec = is->video_st->codec; snprintf(sws_flags_str, sizeof(sws_flags_str), "flags=%d", sws_flags); graph->scale_sws_opts = av_strdup(sws_flags_str); snprintf(buffersrc_args, sizeof(buffersrc_args), "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d", codec->width, codec->height, codec->pix_fmt, is->video_st->time_base.num, is->video_st->time_base.den, codec->sample_aspect_ratio.num, codec->sample_aspect_ratio.den); if ((ret = avfilter_graph_create_filter(&filt_src, avfilter_get_by_name("buffer"), "ffplay_buffer", buffersrc_args, NULL, graph)) < 0) return ret; buffersink_params->pixel_fmts = pix_fmts; ret = avfilter_graph_create_filter(&filt_out, avfilter_get_by_name("ffbuffersink"), "ffplay_buffersink", NULL, buffersink_params, graph); av_freep(&buffersink_params); if (ret < 0) return ret; /* SDL YUV code is not handling odd width/height for some driver * combinations, therefore we crop the picture to an even width/height. */ if ((ret = avfilter_graph_create_filter(&filt_crop, avfilter_get_by_name("crop"), "ffplay_crop", "floor(in_w/2)*2:floor(in_h/2)*2", NULL, graph)) < 0) return ret; if ((ret = avfilter_graph_create_filter(&filt_format, avfilter_get_by_name("format"), "format", "yuv420p", NULL, graph)) < 0) return ret; if ((ret = avfilter_link(filt_crop, 0, filt_format, 0)) < 0) return ret; if ((ret = avfilter_link(filt_format, 0, filt_out, 0)) < 0) return ret; if ((ret = configure_filtergraph(graph, vfilters, filt_src, filt_crop)) < 0) return ret; is->in_video_filter = filt_src; is->out_video_filter = filt_out; return ret; }