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#include <gst/gst.h>
GstPad *srcpad, *sinkpad;
GstPad *srcconvpad, *sinkconvpad;
GstPadTemplate *srcpadtempl, *sinkpadtempl;
GstPadTemplate *srcconvtempl, *sinkconvtempl;
gint converter_in = -1, converter_out = -1;
gint target_rate = 2000;
static GstPadTemplate*
src_factory (void)
{
return
gst_padtemplate_new (
"src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
gst_caps_new (
"test_src",
"audio/raw",
gst_props_new (
"rate", GST_PROPS_INT_RANGE (16, 20000),
NULL)),
NULL);
}
static GstPadTemplate*
src_conv_factory (void)
{
return
gst_padtemplate_new (
"src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
gst_caps_new (
"test_src",
"audio/raw",
gst_props_new (
"rate", GST_PROPS_INT_RANGE (16, 20000),
NULL)),
NULL);
}
static GstPadTemplate*
sink_conv_factory (void)
{
return
gst_padtemplate_new (
"src",
GST_PAD_SINK,
GST_PAD_ALWAYS,
gst_caps_new (
"test_src",
"audio/raw",
gst_props_new (
"rate", GST_PROPS_INT_RANGE (16, 20000),
NULL)),
NULL);
}
static GstPadTemplate*
sink_factory (void)
{
return
gst_padtemplate_new (
"sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
gst_caps_new (
"test_sink",
"audio/raw",
gst_props_new (
"rate", GST_PROPS_INT_RANGE (16, 20000),
NULL)),
NULL);
}
static GstCaps*
sink_caps (void)
{
return
gst_caps_new (
"sink_caps",
"audio/raw",
gst_props_new (
"rate", GST_PROPS_INT (6000),
NULL));
}
static GstCaps*
src_caps (void)
{
return
gst_caps_new (
"src_caps",
"audio/raw",
gst_props_new (
"rate", GST_PROPS_INT (3000),
NULL));
}
static GstPadTemplate *srctempl, *sinktempl;
static GstCaps *srccaps, *sinkcaps;
static GstPadNegotiateReturn
converter_negotiate_src (GstPad *pad, GstCaps **caps, gpointer *data)
{
g_print (">");
if (*data == NULL) {
*caps = NULL;
return GST_PAD_NEGOTIATE_TRY;
}
if (*caps) {
converter_out = gst_caps_get_int (*caps, "rate");
return GST_PAD_NEGOTIATE_AGREE;
}
return GST_PAD_NEGOTIATE_FAIL;
}
static GstPadNegotiateReturn
converter_negotiate_sink (GstPad *pad, GstCaps **caps, gpointer *data)
{
g_print ("<");
if (*data == NULL) {
*caps = GST_PAD_CAPS (srcconvpad);
return GST_PAD_NEGOTIATE_TRY;
}
if (*caps) {
converter_in = gst_caps_get_int (*caps, "rate");
if (*data == 1) {
converter_out = gst_caps_get_int (*caps, "rate");
return gst_pad_negotiate_proxy (pad, srcconvpad, caps);
}
return GST_PAD_NEGOTIATE_AGREE;
}
return GST_PAD_NEGOTIATE_FAIL;
}
static GstPadNegotiateReturn
target_negotiate_sink (GstPad *pad, GstCaps **caps, gpointer *data)
{
g_print ("{");
if (*data == NULL) {
*caps = gst_caps_new (
"target_caps",
"audio/raw",
gst_props_new (
"rate", GST_PROPS_INT (target_rate),
NULL)
);
return GST_PAD_NEGOTIATE_TRY;
}
if (*caps) {
target_rate = gst_caps_get_int (*caps, "rate");
g_print ("target set %d\n", target_rate);
return GST_PAD_NEGOTIATE_AGREE;
}
return GST_PAD_NEGOTIATE_FAIL;
}
int
main (int argc, char *argv[])
{
gboolean overall = TRUE;
gboolean result;
gst_init (&argc, &argv);
srctempl = src_factory ();
sinktempl = sink_factory ();
srcpad = gst_pad_new_from_template (srctempl, "src");
sinkpad = gst_pad_new_from_template (sinktempl, "sink");
srcconvtempl = src_conv_factory ();
sinkconvtempl = sink_conv_factory ();
srcconvpad = gst_pad_new_from_template (srcconvtempl, "csrc");
sinkconvpad = gst_pad_new_from_template (sinkconvtempl, "csink");
gst_pad_set_negotiate_function (srcconvpad, converter_negotiate_src);
gst_pad_set_negotiate_function (sinkconvpad, converter_negotiate_sink);
gst_pad_set_negotiate_function (sinkpad, target_negotiate_sink);
sinkcaps = sink_caps ();
srccaps = src_caps ();
g_print ("-------) (-----------) (----- \n");
g_print (" ! ! converter ! ! \n");
g_print (" src -- csink csrc -- sink \n");
g_print ("-------) (-----------) (----- \n\n");
g_print ("The convertor first tries to proxy the caps received\n");
g_print ("on its csink pad to its csrc pad, when that fails, it\n");
g_print ("sets up the conversion.\n\n");
g_print ("sink pad set caps (rate=%d), converter status: %d %d\n", target_rate,
converter_in, converter_out);
gst_caps_set (sinkcaps, "rate", GST_PROPS_INT (target_rate));
result = gst_pad_set_caps (sinkpad, sinkcaps);
g_print ("result: %d, converter status: %d %d, target: %d\n\n", result,
converter_in, converter_out, target_rate);
result = gst_pad_connect (srcpad, sinkconvpad);
g_print ("pad connect 1: %d\n", result);
overall &= (result == TRUE);
result = gst_pad_connect (srcconvpad, sinkpad);
g_print ("pad connect 2: %d\n", result);
overall &= (result == TRUE);
g_print ("after connect, converter status: %d %d, target %d\n\n", converter_in, converter_out, target_rate);
g_print ("src pad set caps (rate=%d), converter status: %d %d, target %d \n", gst_caps_get_int (srccaps, "rate"),
converter_in, converter_out, target_rate);
result = gst_pad_set_caps (srcpad, srccaps);
g_print ("result %d, converter status: %d %d, target %d\n\n", result,
converter_in, converter_out, target_rate);
g_print ("sink pad set caps (rate=2000), converter status: %d %d, target %d \n",
converter_in, converter_out, target_rate);
target_rate = 2000;
gst_caps_set (sinkcaps, "rate", GST_PROPS_INT (target_rate));
result = gst_pad_set_caps (sinkpad, sinkcaps);
g_print ("result %d, converter status: %d %d, target: %d\n\n", result,
converter_in, converter_out, target_rate);
gst_caps_set (srccaps, "rate", GST_PROPS_INT (4000));
result = gst_pad_renegotiate (srcpad);
g_print ("sink pad renegotiate caps %d, converter status: %d %d, target: %d\n", result,
converter_in, converter_out, target_rate);
gst_caps_set (srccaps, "rate", GST_PROPS_INT (40000));
result = gst_pad_set_caps (srcpad, srccaps);
g_print ("sink pad set caps %d, converter status: %d %d, target: %d\n", result,
converter_in, converter_out, target_rate);
gst_caps_set (sinkcaps, "rate", GST_PROPS_INT (40000));
result = gst_pad_set_caps (sinkpad, sinkcaps);
g_print ("sink pad set caps %d, converter status: %d %d, target: %d\n", result,
converter_in, converter_out, target_rate);
target_rate = 9000;
gst_caps_set (sinkcaps, "rate", GST_PROPS_INT (target_rate));
result = gst_pad_set_caps (sinkpad, sinkcaps);
g_print ("sink pad set caps %d, converter status: %d %d, target: %d\n", result,
converter_in, converter_out, target_rate);
exit (!overall);
}
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