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Added CV_CAP_PROP_SAR properties to videoio module

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This commit is contained in:
Pierre Letessier 2015-10-21 10:32:38 +02:00
parent 9a0beda037
commit baa21484a1
3 changed files with 32 additions and 1 deletions
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2
modules/videoio/include/opencv2/videoio/videoio_c.h
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@ -190,6 +190,8 @@ enum
CV_CAP_PROP_SETTINGS =37,
CV_CAP_PROP_BUFFERSIZE =38,
CV_CAP_PROP_AUTOFOCUS =39,
CV_CAP_PROP_SAR_NUM =40,
CV_CAP_PROP_SAR_DEN =41,
CV_CAP_PROP_AUTOGRAB =1024, // property for videoio class CvCapture_Android only
CV_CAP_PROP_SUPPORTED_PREVIEW_SIZES_STRING=1025, // readonly, tricky property, returns cpnst char* indeed

4
modules/videoio/src/cap_ffmpeg_api.hpp
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@ -23,7 +23,9 @@ enum
CV_FFMPEG_CAP_PROP_FRAME_HEIGHT=4,
CV_FFMPEG_CAP_PROP_FPS=5,
CV_FFMPEG_CAP_PROP_FOURCC=6,
CV_FFMPEG_CAP_PROP_FRAME_COUNT=7
CV_FFMPEG_CAP_PROP_FRAME_COUNT=7,
CV_FFMPEG_CAP_PROP_SAR_NUM=39,
CV_FFMPEG_CAP_PROP_SAR_DEN=40
};

27
modules/videoio/src/cap_ffmpeg_impl.hpp
View File

@ -250,6 +250,7 @@ struct CvCapture_FFMPEG
double get_duration_sec() const;
double get_fps() const;
int get_bitrate() const;
AVRational get_sample_aspect_ratio(AVStream *stream) const;
double r2d(AVRational r) const;
int64_t dts_to_frame_number(int64_t dts);
@ -836,6 +837,10 @@ double CvCapture_FFMPEG::getProperty( int property_id ) const
#else
return (double)video_st->codec.codec_tag;
#endif
case CV_FFMPEG_CAP_PROP_SAR_NUM:
return get_sample_aspect_ratio(ic->streams[video_stream]).num;
case CV_FFMPEG_CAP_PROP_SAR_DEN:
return get_sample_aspect_ratio(ic->streams[video_stream]).den;
default:
break;
}
@ -910,6 +915,28 @@ int64_t CvCapture_FFMPEG::dts_to_frame_number(int64_t dts)
return (int64_t)(get_fps() * sec + 0.5);
}
AVRational CvCapture_FFMPEG::get_sample_aspect_ratio(AVStream *stream) const
{
AVRational undef = {0, 1};
AVRational stream_sample_aspect_ratio = stream ? stream->sample_aspect_ratio : undef;
AVRational frame_sample_aspect_ratio = stream && stream->codec ? stream->codec->sample_aspect_ratio : undef;
av_reduce(&stream_sample_aspect_ratio.num, &stream_sample_aspect_ratio.den,
stream_sample_aspect_ratio.num, stream_sample_aspect_ratio.den, INT_MAX);
if (stream_sample_aspect_ratio.num <= 0 || stream_sample_aspect_ratio.den <= 0)
stream_sample_aspect_ratio = undef;
av_reduce(&frame_sample_aspect_ratio.num, &frame_sample_aspect_ratio.den,
frame_sample_aspect_ratio.num, frame_sample_aspect_ratio.den, INT_MAX);
if (frame_sample_aspect_ratio.num <= 0 || frame_sample_aspect_ratio.den <= 0)
frame_sample_aspect_ratio = undef;
if (stream_sample_aspect_ratio.num)
return stream_sample_aspect_ratio;
else
return frame_sample_aspect_ratio;
}
double CvCapture_FFMPEG::dts_to_sec(int64_t dts)
{
return (double)(dts - ic->streams[video_stream]->start_time) *