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#include <gst/gst.h>
#include <gst/base/gstaggregator.h>
#define MAKE_AND_ADD(var, pipe, name, label) \
G_STMT_START \
{ \
GError* make_and_add_err = NULL; \
if (G_UNLIKELY(!(var = (gst_parse_bin_from_description_full( \
name, \
TRUE, \
NULL, \
GST_PARSE_FLAG_NO_SINGLE_ELEMENT_BINS, \
&make_and_add_err))))) { \
GST_ERROR( \
"Could not create element %s (%s)", name, make_and_add_err->message); \
g_clear_error(&make_and_add_err); \
goto label; \
} \
if (G_UNLIKELY(!gst_bin_add(GST_BIN_CAST(pipe), var))) { \
GST_ERROR("Could not add element %s", name); \
goto label; \
} \
} \
G_STMT_END
static gboolean
check_aggregated_buffer (GstElement * agg, GstPad * pad,
GHashTable * consumed_buffers)
{
GstSample *sample;
GList *pad_consumed_buffers;
GList *tmp;
sample =
gst_aggregator_peek_next_sample (GST_AGGREGATOR (agg),
GST_AGGREGATOR_PAD (pad));
pad_consumed_buffers = g_hash_table_lookup (consumed_buffers, pad);
for (tmp = pad_consumed_buffers; tmp; tmp = tmp->next) {
GstBuffer *consumed_buffer = (GstBuffer *) tmp->data;
gboolean aggregated = FALSE;
if (sample) {
aggregated =
consumed_buffer == gst_sample_get_buffer (sample) ? TRUE : FALSE;
}
gst_printerr ("One consumed buffer: %" GST_PTR_FORMAT
", it was%s aggregated\n", consumed_buffer, aggregated ? "" : " not");
}
if (sample) {
gst_sample_unref (sample);
}
g_list_free_full (pad_consumed_buffers, (GDestroyNotify) gst_buffer_unref);
g_hash_table_steal (consumed_buffers, pad);
return TRUE;
}
static void
samples_selected_cb (GstElement * agg, GstSegment * segment, GstClockTime pts,
GstClockTime dts, GstClockTime duration, GstStructure * info,
GHashTable * consumed_buffers)
{
gst_printerr
("Compositor has selected the samples it will aggregate for output buffer with PTS %"
GST_TIME_FORMAT " and duration %" GST_TIME_FORMAT "\n",
GST_TIME_ARGS (pts), GST_TIME_ARGS (duration));
gst_element_foreach_sink_pad (agg,
(GstElementForeachPadFunc) check_aggregated_buffer, consumed_buffers);
}
static void
pad_buffer_consumed_cb (GstAggregatorPad * pad, GstBuffer * buffer,
GHashTable * consumed_buffers)
{
GList *pad_consumed_buffers;
gboolean was_empty;
pad_consumed_buffers = g_hash_table_lookup (consumed_buffers, pad);
was_empty = (pad_consumed_buffers == NULL);
pad_consumed_buffers =
g_list_append (pad_consumed_buffers, gst_buffer_ref (buffer));
/* we know the list's head pointer doesn't change when items get appended */
if (was_empty)
g_hash_table_insert (consumed_buffers, pad, pad_consumed_buffers);
}
static gboolean
unref_consumed_buffers (gpointer key, GList * pad_consumed_buffers)
{
g_list_free_full (pad_consumed_buffers, (GDestroyNotify) gst_buffer_unref);
return TRUE;
}
int
main (int ac, char **av)
{
int ret = 0;
GstElement *pipe;
GstBus *bus;
GstElement *vsrc, *vcfltr1, *compositor, *vcfltr2, *vsink;
GstCaps *caps;
GstPad *pad;
GHashTable *consumed_buffers =
g_hash_table_new (g_direct_hash, g_direct_equal);
gst_init (NULL, NULL);
pipe = gst_pipeline_new (NULL);
MAKE_AND_ADD (vsrc, pipe, "videotestsrc", err);
MAKE_AND_ADD (vcfltr1, pipe, "capsfilter", err);
MAKE_AND_ADD (compositor, pipe, "compositor", err);
MAKE_AND_ADD (vcfltr2, pipe, "capsfilter", err);
MAKE_AND_ADD (vsink, pipe, "autovideosink", err);
if (!gst_element_link_many (vsrc, vcfltr1, compositor, vcfltr2, vsink, NULL)) {
GST_ERROR ("Failed to link pipeline");
goto err;
}
caps =
gst_caps_new_simple ("video/x-raw", "framerate", GST_TYPE_FRACTION, 30, 1,
NULL);
g_object_set (vcfltr1, "caps", caps, NULL);
gst_caps_unref (caps);
caps =
gst_caps_new_simple ("video/x-raw", "framerate", GST_TYPE_FRACTION, 6, 1,
NULL);
g_object_set (vcfltr2, "caps", caps, NULL);
gst_caps_unref (caps);
g_object_set (vsrc, "num-buffers", 300, NULL);
g_object_set (compositor, "emit-signals", TRUE, NULL);
g_signal_connect (compositor, "samples-selected",
G_CALLBACK (samples_selected_cb), consumed_buffers);
pad = gst_element_get_static_pad (compositor, "sink_0");
g_object_set (pad, "emit-signals", TRUE, NULL);
g_signal_connect (pad, "buffer-consumed", G_CALLBACK (pad_buffer_consumed_cb),
consumed_buffers);
gst_object_unref (pad);
gst_element_set_state (pipe, GST_STATE_PLAYING);
bus = gst_pipeline_get_bus (GST_PIPELINE (pipe));
gst_message_unref (gst_bus_timed_pop_filtered (bus, GST_CLOCK_TIME_NONE,
GST_MESSAGE_EOS));
gst_object_unref (bus);
done:
g_hash_table_foreach_remove (consumed_buffers,
(GHRFunc) unref_consumed_buffers, NULL);
g_hash_table_unref (consumed_buffers);
gst_element_set_state (pipe, GST_STATE_NULL);
gst_object_unref (pipe);
return ret;
err:
ret = 1;
goto done;
}
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