static GstElement *
build_convert_frame_pipeline (GstElement ** src_element,
GstElement ** sink_element, const GstCaps * from_caps,
const GstCaps * to_caps, GError ** err)
{
GstElement *src = NULL, *csp = NULL, *vscale = NULL;
GstElement *sink = NULL, *encoder = NULL, *pipeline;
GError *error = NULL;
/* videoscale is here to correct for the pixel-aspect-ratio for us */
GST_DEBUG ("creating elements");
if (!create_element ("appsrc", &src, &error) ||
!create_element ("ffmpegcolorspace", &csp, &error) ||
!create_element ("videoscale", &vscale, &error) ||
!create_element ("appsink", &sink, &error))
goto no_elements;
pipeline = gst_pipeline_new ("videoconvert-pipeline");
if (pipeline == NULL)
goto no_pipeline;
/* Add black borders if necessary to keep the DAR */
g_object_set (vscale, "add-borders", TRUE, NULL);
GST_DEBUG ("adding elements");
gst_bin_add_many (GST_BIN (pipeline), src, csp, vscale, sink, NULL);
/* set caps */
g_object_set (src, "caps", from_caps, NULL);
g_object_set (sink, "caps", to_caps, NULL);
/* FIXME: linking is still way too expensive, profile this properly */
GST_DEBUG ("linking src->csp");
if (!gst_element_link_pads (src, "src", csp, "sink"))
goto link_failed;
GST_DEBUG ("linking csp->vscale");
if (!gst_element_link_pads (csp, "src", vscale, "sink"))
goto link_failed;
if (caps_are_raw (to_caps)) {
GST_DEBUG ("linking vscale->sink");
if (!gst_element_link_pads (vscale, "src", sink, "sink"))
goto link_failed;
} else {
encoder = get_encoder (to_caps, &error);
if (!encoder)
goto no_encoder;
gst_bin_add (GST_BIN (pipeline), encoder);
GST_DEBUG ("linking vscale->encoder");
if (!gst_element_link (vscale, encoder))
goto link_failed;
GST_DEBUG ("linking encoder->sink");
if (!gst_element_link_pads (encoder, "src", sink, "sink"))
goto link_failed;
}
g_object_set (src, "emit-signals", TRUE, NULL);
g_object_set (sink, "emit-signals", TRUE, NULL);
*src_element = src;
*sink_element = sink;
return pipeline;
/* ERRORS */
no_encoder:
{
gst_object_unref (pipeline);
GST_ERROR ("could not find an encoder for provided caps");
if (err)
*err = error;
else
g_error_free (error);
return NULL;
}
no_elements:
{
if (src)
gst_object_unref (src);
if (csp)
gst_object_unref (csp);
if (vscale)
gst_object_unref (vscale);
if (sink)
gst_object_unref (sink);
GST_ERROR ("Could not convert video frame: %s", error->message);
if (err)
*err = error;
else
g_error_free (error);
return NULL;
}
no_pipeline:
{
gst_object_unref (src);
gst_object_unref (csp);
gst_object_unref (vscale);
gst_object_unref (sink);
GST_ERROR ("Could not convert video frame: no pipeline (unknown error)");
if (err)
*err = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
"Could not convert video frame: no pipeline (unknown error)");
return NULL;
}
link_failed:
{
gst_object_unref (pipeline);
GST_ERROR ("Could not convert video frame: failed to link elements");
if (err)
*err = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_NEGOTIATION,
"Could not convert video frame: failed to link elements");
return NULL;
}
}
static GstElement *
build_convert_frame_pipeline (GstElement ** src_element,
GstElement ** sink_element, const GstCaps * from_caps,
GstVideoCropMeta * cmeta, const GstCaps * to_caps, GError ** err)
{
GstElement *vcrop = NULL, *csp = NULL, *csp2 = NULL, *vscale = NULL;
GstElement *src = NULL, *sink = NULL, *encoder = NULL, *pipeline;
GstVideoInfo info;
GError *error = NULL;
if (cmeta) {
if (!create_element ("videocrop", &vcrop, &error)) {
g_error_free (error);
g_warning
("build_convert_frame_pipeline: Buffer has crop metadata but videocrop element is not found. Cropping will be disabled");
} else {
if (!create_element ("videoconvert", &csp2, &error))
goto no_elements;
}
}
/* videoscale is here to correct for the pixel-aspect-ratio for us */
GST_DEBUG ("creating elements");
if (!create_element ("appsrc", &src, &error) ||
!create_element ("videoconvert", &csp, &error) ||
!create_element ("videoscale", &vscale, &error) ||
!create_element ("appsink", &sink, &error))
goto no_elements;
pipeline = gst_pipeline_new ("videoconvert-pipeline");
if (pipeline == NULL)
goto no_pipeline;
/* Add black borders if necessary to keep the DAR */
g_object_set (vscale, "add-borders", TRUE, NULL);
GST_DEBUG ("adding elements");
gst_bin_add_many (GST_BIN (pipeline), src, csp, vscale, sink, NULL);
if (vcrop)
gst_bin_add_many (GST_BIN (pipeline), vcrop, csp2, NULL);
/* set caps */
g_object_set (src, "caps", from_caps, NULL);
if (vcrop) {
gst_video_info_from_caps (&info, from_caps);
g_object_set (vcrop, "left", cmeta->x, NULL);
g_object_set (vcrop, "top", cmeta->y, NULL);
g_object_set (vcrop, "right", GST_VIDEO_INFO_WIDTH (&info) - cmeta->width,
NULL);
g_object_set (vcrop, "bottom",
GST_VIDEO_INFO_HEIGHT (&info) - cmeta->height, NULL);
GST_DEBUG ("crop meta [x,y,width,height]: %d %d %d %d", cmeta->x, cmeta->y,
cmeta->width, cmeta->height);
}
g_object_set (sink, "caps", to_caps, NULL);
/* FIXME: linking is still way too expensive, profile this properly */
if (vcrop) {
GST_DEBUG ("linking src->csp2");
if (!gst_element_link_pads (src, "src", csp2, "sink"))
goto link_failed;
GST_DEBUG ("linking csp2->vcrop");
if (!gst_element_link_pads (csp2, "src", vcrop, "sink"))
goto link_failed;
GST_DEBUG ("linking vcrop->csp");
if (!gst_element_link_pads (vcrop, "src", csp, "sink"))
goto link_failed;
} else {
GST_DEBUG ("linking src->csp");
if (!gst_element_link_pads (src, "src", csp, "sink"))
goto link_failed;
}
GST_DEBUG ("linking csp->vscale");
if (!gst_element_link_pads_full (csp, "src", vscale, "sink",
GST_PAD_LINK_CHECK_NOTHING))
goto link_failed;
if (caps_are_raw (to_caps)) {
GST_DEBUG ("linking vscale->sink");
if (!gst_element_link_pads_full (vscale, "src", sink, "sink",
GST_PAD_LINK_CHECK_NOTHING))
goto link_failed;
} else {
encoder = get_encoder (to_caps, &error);
if (!encoder)
goto no_encoder;
gst_bin_add (GST_BIN (pipeline), encoder);
GST_DEBUG ("linking vscale->encoder");
if (!gst_element_link (vscale, encoder))
goto link_failed;
GST_DEBUG ("linking encoder->sink");
if (!gst_element_link_pads (encoder, "src", sink, "sink"))
goto link_failed;
}
g_object_set (src, "emit-signals", TRUE, NULL);
g_object_set (sink, "emit-signals", TRUE, NULL);
*src_element = src;
*sink_element = sink;
return pipeline;
/* ERRORS */
no_encoder:
{
gst_object_unref (pipeline);
GST_ERROR ("could not find an encoder for provided caps");
if (err)
*err = error;
else
g_error_free (error);
return NULL;
}
no_elements:
{
if (src)
gst_object_unref (src);
if (vcrop)
gst_object_unref (vcrop);
if (csp)
gst_object_unref (csp);
if (csp2)
gst_object_unref (csp2);
if (vscale)
gst_object_unref (vscale);
if (sink)
gst_object_unref (sink);
GST_ERROR ("Could not convert video frame: %s", error->message);
if (err)
*err = error;
else
g_error_free (error);
return NULL;
}
no_pipeline:
{
gst_object_unref (src);
if (vcrop)
gst_object_unref (vcrop);
gst_object_unref (csp);
if (csp2)
gst_object_unref (csp2);
gst_object_unref (vscale);
gst_object_unref (sink);
GST_ERROR ("Could not convert video frame: no pipeline (unknown error)");
if (err)
*err = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
"Could not convert video frame: no pipeline (unknown error)");
return NULL;
}
link_failed:
{
gst_object_unref (pipeline);
GST_ERROR ("Could not convert video frame: failed to link elements");
if (err)
*err = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_NEGOTIATION,
"Could not convert video frame: failed to link elements");
return NULL;
}
}
