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Merge pull request #8914 from stnk20:gstreamer_yuv

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Add gstreamer capture capability for some YUV formats (#8914)

* Add gstreamer capture capability for some YUV formats.(only for gstreamer-1.0)

* avoid cross initialization error

* add checking if pipeline is manualpipeline, for compatibility.
pull/8511/head^2
Satoshi Tanaka 8 years ago committed by Alexander Alekhin
parent 6d1cdcf601
commit 96a3c7954d
1 changed files with 35 additions and 3 deletions
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  1. 38
      modules/videoio/src/cap_gstreamer.cpp

38
modules/videoio/src/cap_gstreamer.cpp
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@ -287,6 +287,8 @@ IplImage * CvCapture_GStreamer::retrieveFrame(int)
}
int depth = 3;
bool height_extend = false;
#if GST_VERSION_MAJOR > 0
depth = 0;
const gchar* name = gst_structure_get_name(structure);
@ -295,9 +297,16 @@ IplImage * CvCapture_GStreamer::retrieveFrame(int)
if (!name)
return 0;
// we support 3 types of data:
// we support 11 types of data:
// video/x-raw, format=BGR -> 8bit, 3 channels
// video/x-raw, format=GRAY8 -> 8bit, 1 channel
// video/x-raw, format=UYVY -> 8bit, 2 channel
// video/x-raw, format=YUY2 -> 8bit, 2 channel
// video/x-raw, format=YVYU -> 8bit, 2 channel
// video/x-raw, format=NV12 -> 8bit, 1 channel (height is 1.5x larger than true height)
// video/x-raw, format=NV21 -> 8bit, 1 channel (height is 1.5x larger than true height)
// video/x-raw, format=YV12 -> 8bit, 1 channel (height is 1.5x larger than true height)
// video/x-raw, format=I420 -> 8bit, 1 channel (height is 1.5x larger than true height)
// video/x-bayer -> 8bit, 1 channel
// image/jpeg -> 8bit, mjpeg: buffer_size x 1 x 1
// bayer data is never decoded, the user is responsible for that
@ -311,6 +320,13 @@ IplImage * CvCapture_GStreamer::retrieveFrame(int)
if (strcasecmp(format, "BGR") == 0) {
depth = 3;
}
else if( (strcasecmp(format, "UYVY") == 0) || (strcasecmp(format, "YUY2") == 0) || (strcasecmp(format, "YVYU") == 0) ){
depth = 2;
}
else if( (strcasecmp(format, "NV12") == 0) || (strcasecmp(format, "NV21") == 0) || (strcasecmp(format, "YV12") == 0) || (strcasecmp(format, "I420") == 0) ){
depth = 1;
height_extend = true;
}
else if(strcasecmp(format, "GRAY8") == 0){
depth = 1;
}
@ -324,7 +340,11 @@ IplImage * CvCapture_GStreamer::retrieveFrame(int)
}
#endif
if (depth > 0) {
frame = cvCreateImageHeader(cvSize(width, height), IPL_DEPTH_8U, depth);
if(height_extend){
frame = cvCreateImageHeader(cvSize(width, height*3/2), IPL_DEPTH_8U, depth);
}else{
frame = cvCreateImageHeader(cvSize(width, height), IPL_DEPTH_8U, depth);
}
} else {
gst_caps_unref(buffer_caps);
return 0;
@ -810,8 +830,20 @@ bool CvCapture_GStreamer::open( int type, const char* filename )
"blue_mask", G_TYPE_INT, 0xFF0000,
NULL);
#else
// support 1 and 3 channel 8 bit data, as well as bayer (also 1 channel, 8bit)
caps = gst_caps_from_string("video/x-raw, format=(string){BGR, GRAY8}; video/x-bayer,format=(string){rggb,bggr,grbg,gbrg}; image/jpeg");
if(manualpipeline){
GstPad* sink_pad = gst_element_get_static_pad(sink, "sink");
GstCaps* peer_caps = gst_pad_peer_query_caps(sink_pad,NULL);
if (!gst_caps_can_intersect(caps, peer_caps)) {
gst_caps_unref(caps);
caps = gst_caps_from_string("video/x-raw, format=(string){UYVY,YUY2,YVYU,NV12,NV21,YV12,I420}");
}
gst_object_unref(sink_pad);
gst_caps_unref(peer_caps);
}
#endif
gst_app_sink_set_caps(GST_APP_SINK(sink), caps);
gst_caps_unref(caps);

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