ffmpeg | branch: master | Paul B Mahol <one...@gmail.com> | Sun Aug 7 20:19:34 2016 +0200| [571f33de0aa8639b4f9b863e04ee6bcfd4d78070] | committer: Paul B Mahol
avfilter/avf_showspectrum: improve dB scale description > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=571f33de0aa8639b4f9b863e04ee6bcfd4d78070 --- libavfilter/avf_showspectrum.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/libavfilter/avf_showspectrum.c b/libavfilter/avf_showspectrum.c index 648901f..8185faa 100644 --- a/libavfilter/avf_showspectrum.c +++ b/libavfilter/avf_showspectrum.c @@ -1181,6 +1181,18 @@ static int showspectrumpic_request_frame(AVFilterLink *outlink) memset(s->outpicref->data[1]+(s->start_y + h * (ch + 1) - y - 1) * s->outpicref->linesize[1] + s->w + s->start_x + 20, av_clip_uint8(out[1]), 10); memset(s->outpicref->data[2]+(s->start_y + h * (ch + 1) - y - 1) * s->outpicref->linesize[2] + s->w + s->start_x + 20, av_clip_uint8(out[2]), 10); } + + for (y = 0; ch == 0 && y < h; y += h / 10) { + float value = 120.0 * log10(1. - y / (float)h); + char *text; + + if (value < -120) + break; + text = av_asprintf("%.0f dB", value); + if (!text) + continue; + drawtext(s->outpicref, s->w + s->start_x + 35, s->start_y + y - 5, text, 0); + } } } _______________________________________________ ffmpeg-cvslog mailing list ffmpeg-cvslog@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog
