void
gst_scene_change_finalize (GObject * object)
{
GstSceneChange *scenechange;
g_return_if_fail (GST_IS_SCENE_CHANGE (object));
scenechange = GST_SCENE_CHANGE (object);
if (scenechange->oldbuf)
gst_buffer_unref (scenechange->oldbuf);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static GstFlowReturn
gst_scene_change_filter_ip_I420 (GstVideoFilter2 * videofilter2,
GstBuffer * buf, int start, int end)
{
GstSceneChange *scenechange;
double score_min;
double score_max;
double threshold;
double score;
gboolean change;
int i;
int width;
int height;
g_return_val_if_fail (GST_IS_SCENE_CHANGE (videofilter2), GST_FLOW_ERROR);
scenechange = GST_SCENE_CHANGE (videofilter2);
width = GST_VIDEO_FILTER2_WIDTH (videofilter2);
height = GST_VIDEO_FILTER2_HEIGHT (videofilter2);
if (!scenechange->oldbuf) {
scenechange->n_diffs = 0;
memset (scenechange->diffs, 0, sizeof (double) * SC_N_DIFFS);
scenechange->oldbuf = gst_buffer_ref (buf);
return GST_FLOW_OK;
}
score = get_frame_score (GST_BUFFER_DATA (scenechange->oldbuf),
GST_BUFFER_DATA (buf), width, height);
memmove (scenechange->diffs, scenechange->diffs + 1,
sizeof (double) * (SC_N_DIFFS - 1));
scenechange->diffs[SC_N_DIFFS - 1] = score;
scenechange->n_diffs++;
gst_buffer_unref (scenechange->oldbuf);
scenechange->oldbuf = gst_buffer_ref (buf);
score_min = scenechange->diffs[0];
score_max = scenechange->diffs[0];
for (i = 1; i < SC_N_DIFFS - 1; i++) {
score_min = MIN (score_min, scenechange->diffs[i]);
score_max = MAX (score_max, scenechange->diffs[i]);
}
threshold = 1.8 * score_max - 0.8 * score_min;
if (scenechange->n_diffs > 2) {
if (score < 5) {
change = FALSE;
} else if (score / threshold < 1.0) {
change = FALSE;
} else if (score / threshold > 2.5) {
change = TRUE;
} else if (score > 50) {
change = TRUE;
} else {
change = FALSE;
}
} else {
change = FALSE;
}
#ifdef TESTING
if (change != is_shot_change (scenechange->n_diffs)) {
g_print ("%d %g %g %g %d\n", scenechange->n_diffs, score / threshold,
score, threshold, change);
}
#endif
if (change) {
GstEvent *event;
GST_DEBUG_OBJECT (scenechange, "%d %g %g %g %d",
scenechange->n_diffs, score / threshold, score, threshold, change);
event = gst_event_new_custom (GST_EVENT_CUSTOM_DOWNSTREAM,
gst_structure_new ("GstForceKeyUnit", NULL));
gst_pad_push_event (GST_BASE_TRANSFORM_SRC_PAD (scenechange), event);
}
return GST_FLOW_OK;
}
static GstFlowReturn
gst_scene_change_transform_frame_ip (GstVideoFilter * filter,
GstVideoFrame * frame)
{
GstSceneChange *scenechange = GST_SCENE_CHANGE (filter);
GstVideoFrame oldframe;
double score_min;
double score_max;
double threshold;
double score;
gboolean change;
gboolean ret;
int i;
GST_DEBUG_OBJECT (scenechange, "transform_frame_ip");
if (!scenechange->oldbuf) {
scenechange->n_diffs = 0;
memset (scenechange->diffs, 0, sizeof (double) * SC_N_DIFFS);
scenechange->oldbuf = gst_buffer_ref (frame->buffer);
memcpy (&scenechange->oldinfo, &frame->info, sizeof (GstVideoInfo));
return GST_FLOW_OK;
}
ret =
gst_video_frame_map (&oldframe, &scenechange->oldinfo,
scenechange->oldbuf, GST_MAP_READ);
if (!ret) {
GST_ERROR_OBJECT (scenechange, "failed to map old video frame");
return GST_FLOW_ERROR;
}
score = get_frame_score (&oldframe, frame);
gst_video_frame_unmap (&oldframe);
gst_buffer_unref (scenechange->oldbuf);
scenechange->oldbuf = gst_buffer_ref (frame->buffer);
memcpy (&scenechange->oldinfo, &frame->info, sizeof (GstVideoInfo));
memmove (scenechange->diffs, scenechange->diffs + 1,
sizeof (double) * (SC_N_DIFFS - 1));
scenechange->diffs[SC_N_DIFFS - 1] = score;
scenechange->n_diffs++;
score_min = scenechange->diffs[0];
score_max = scenechange->diffs[0];
for (i = 1; i < SC_N_DIFFS - 1; i++) {
score_min = MIN (score_min, scenechange->diffs[i]);
score_max = MAX (score_max, scenechange->diffs[i]);
}
threshold = 1.8 * score_max - 0.8 * score_min;
if (scenechange->n_diffs > 2) {
if (score < 5) {
change = FALSE;
} else if (score / threshold < 1.0) {
change = FALSE;
} else if (score / threshold > 2.5) {
change = TRUE;
} else if (score > 50) {
change = TRUE;
} else {
change = FALSE;
}
} else {
change = FALSE;
}
#ifdef TESTING
if (change != is_shot_change (scenechange->n_diffs)) {
g_print ("%d %g %g %g %d\n", scenechange->n_diffs, score / threshold,
score, threshold, change);
}
#endif
if (change) {
GstEvent *event;
GST_INFO_OBJECT (scenechange, "%d %g %g %g %d",
scenechange->n_diffs, score / threshold, score, threshold, change);
event =
gst_video_event_new_downstream_force_key_unit (GST_BUFFER_PTS
(frame->buffer), GST_CLOCK_TIME_NONE, GST_CLOCK_TIME_NONE, FALSE,
scenechange->count++);
gst_pad_push_event (GST_BASE_TRANSFORM_SRC_PAD (scenechange), event);
}
return GST_FLOW_OK;
}