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gstreamer/gst/videomeasure/gstvideomeasure_ssim.c
Tim-Philipp Müller dbe6fdd6bf docs: remove outdated and pointless 'Last reviewed' lines from docs 
They are very confusing for people, and more often than not
also just not very accurate. Seeing 'last reviewed: 2005' in
your docs is not very confidence-inspiring. Let's just remove
those comments.
2014-04-27 00:36:32 +01:00

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/* GStreamer
* Copyright (C) <2009> Руслан Ижбулатов <lrn1986 _at_ gmail _dot_ com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
/**
* SECTION:element-ssim
*
* The ssim calculates SSIM (Structural SIMilarity) index for two or more
* streams, for each frame.
* First stream is the original, other streams are modified (compressed) ones.
* ssim will calculate SSIM index of each frame of each modified stream, using
* original stream as a reference.
*
* The ssim accepts only YUV planar top-first data and calculates only Y-SSIM.
* All streams must have the same width, height and colorspace.
* Output streams are greyscale video streams, where bright pixels indicate
* high SSIM values, dark pixels - low SSIM values.
* The ssim also calculates mean SSIM index for each frame and emits is as a
* message.
* ssim is intended to be used with videomeasure_collector element to catch the
* events (such as mean SSIM index values) and save them into a file.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch ssim name=ssim ssim.src0 ! videoconvert ! glimagesink filesrc
* location=orig.avi ! decodebin2 ! ssim.original filesrc location=compr.avi !
* decodebin2 ! ssim.modified0
* ]| This pipeline produces a video stream that consists of SSIM frames.
* </refsect2>
*/
/* Element-Checklist-Version: 5 */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstvideomeasure.h"
#include "gstvideomeasure_ssim.h"
#include <gst/audio/audio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#define GST_CAT_DEFAULT gst_ssim_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
/* elementfactory information */
#define SINK_CAPS \
"video/x-raw-yuv, " \
"format = (fourcc) { I420, YV12, Y41B, Y42B } "
#define SRC_CAPS \
"video/x-raw-gray, " \
"width = (int) [ 1, MAX ], " \
"height = (int) [ 1, MAX ], " \
"framerate = (fraction) [ 0/1, MAX ], " \
"bpp = (int) 8, " \
"depth = (int) 8 "
static GstStaticPadTemplate gst_ssim_src_template =
GST_STATIC_PAD_TEMPLATE ("src_%u",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_STATIC_CAPS (SRC_CAPS)
);
static GstStaticPadTemplate gst_ssim_sink_original_template =
GST_STATIC_PAD_TEMPLATE ("original",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS (SINK_CAPS)
);
static GstStaticPadTemplate gst_ssim_sink_modified_template =
GST_STATIC_PAD_TEMPLATE ("modified_%u",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS (SINK_CAPS)
);
static void gst_ssim_class_init (GstSSimClass * klass);
static void gst_ssim_init (GstSSim * ssim);
static void gst_ssim_finalize (GObject * object);
static gboolean gst_ssim_setcaps (GstPad * pad, GstCaps * caps);
static gboolean gst_ssim_query (GstPad * pad, GstQuery * query);
static gboolean gst_ssim_src_event (GstPad * pad, GstEvent * event);
static gboolean gst_ssim_sink_event (GstPad * pad, GstEvent * event);
static GstPad *gst_ssim_request_new_pad (GstElement * element,
GstPadTemplate * temp, const gchar * unused);
static void gst_ssim_release_pad (GstElement * element, GstPad * pad);
static GstStateChangeReturn gst_ssim_change_state (GstElement * element,
GstStateChange transition);
static GstFlowReturn gst_ssim_collected (GstCollectPads * pads,
gpointer user_data);
static GstElementClass *parent_class = NULL;
GType
gst_ssim_get_type (void)
{
static GType ssim_type = 0;
if (G_UNLIKELY (ssim_type == 0)) {
static const GTypeInfo ssim_info = {
sizeof (GstSSimClass), NULL, NULL,
(GClassInitFunc) gst_ssim_class_init, NULL, NULL,
sizeof (GstSSim), 0,
(GInstanceInitFunc) gst_ssim_init,
};
ssim_type = g_type_register_static (GST_TYPE_ELEMENT, "GstSSim",
&ssim_info, 0);
GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "ssim", 0, "SSIM calculator");
}
return ssim_type;
}
static void
gst_ssim_post_message (GstSSim * ssim, GstBuffer * buffer, gfloat mssim,
gfloat lowest, gfloat highest)
{
GstMessage *m;
guint64 offset;
offset = GST_BUFFER_OFFSET (buffer);
m = gst_message_new_element (GST_OBJECT_CAST (ssim),
gst_structure_new ("SSIM",
"offset", G_TYPE_UINT64, offset,
"timestamp", GST_TYPE_CLOCK_TIME, GST_BUFFER_TIMESTAMP (buffer),
"mean", G_TYPE_FLOAT, mssim,
"lowest", G_TYPE_FLOAT, lowest,
"highest", G_TYPE_FLOAT, highest, NULL));
GST_DEBUG_OBJECT (GST_OBJECT (ssim), "Frame %" G_GINT64_FORMAT
" @ %" GST_TIME_FORMAT " mean SSIM is %f, l-h is %f-%f", offset,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)), mssim, lowest, highest);
gst_element_post_message (GST_ELEMENT_CAST (ssim), m);
}
static GstCaps *
gst_ssim_src_getcaps (GstPad * pad)
{
GstCaps *result;
gchar *capstr;
result = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
capstr = gst_caps_to_string (result);
GST_DEBUG ("getsrccaps - return static caps: %s", capstr);
g_free (capstr);
return result;
}
static GstCaps *
gst_ssim_sink_getcaps (GstPad * pad)
{
GstCaps *result = NULL;
GstSSim *ssim;
gchar *capstr;
ssim = GST_SSIM (GST_PAD_PARENT (pad));
GST_OBJECT_LOCK (ssim);
result = gst_pad_get_fixed_caps_func (pad);
capstr = gst_caps_to_string (result);
GST_DEBUG ("getsinkcaps - return caps: %s", capstr);
g_free (capstr);
GST_OBJECT_UNLOCK (ssim);
return result;
}
static void
calculate_mu (GstSSim * ssim, gfloat * outmu, guint8 * buf)
{
gint oy, ox, iy, ix;
for (oy = 0; oy < ssim->height; oy++) {
for (ox = 0; ox < ssim->width; ox++) {
gfloat mu = 0;
gfloat elsumm;
gint weight_y_base, weight_x_base;
gint weight_offset;
gint pixel_offset;
gint winstart_y;
gint wghstart_y;
gint winend_y;
gint winstart_x;
gint wghstart_x;
gint winend_x;
gfloat weight;
gint source_offset;
source_offset = oy * ssim->width + ox;
winstart_x = ssim->windows[source_offset].x_window_start;
wghstart_x = ssim->windows[source_offset].x_weight_start;
winend_x = ssim->windows[source_offset].x_window_end;
winstart_y = ssim->windows[source_offset].y_window_start;
wghstart_y = ssim->windows[source_offset].y_weight_start;
winend_y = ssim->windows[source_offset].y_window_end;
elsumm = ssim->windows[source_offset].element_summ;
switch (ssim->windowtype) {
case 0:
for (iy = winstart_y; iy <= winend_y; iy++) {
pixel_offset = iy * ssim->width;
for (ix = winstart_x; ix <= winend_x; ix++)
mu += buf[pixel_offset + ix];
}
mu = mu / elsumm;
break;
case 1:
weight_y_base = wghstart_y - winstart_y;
weight_x_base = wghstart_x - winstart_x;
for (iy = winstart_y; iy <= winend_y; iy++) {
pixel_offset = iy * ssim->width;
weight_offset = (weight_y_base + iy) * ssim->windowsize +
weight_x_base;
for (ix = winstart_x; ix <= winend_x; ix++) {
weight = ssim->weights[weight_offset + ix];
mu += weight * buf[pixel_offset + ix];
}
}
mu = mu / elsumm;
break;
}
outmu[oy * ssim->width + ox] = mu;
}
}
}
static void
calcssim_without_mu (GstSSim * ssim, guint8 * org, gfloat * orgmu, guint8 * mod,
guint8 * out, gfloat * mean, gfloat * lowest, gfloat * highest)
{
gint oy, ox, iy, ix;
gfloat cumulative_ssim = 0;
*lowest = G_MAXFLOAT;
*highest = -G_MAXFLOAT;
for (oy = 0; oy < ssim->height; oy++) {
for (ox = 0; ox < ssim->width; ox++) {
gfloat mu_o = 128, mu_m = 128;
gdouble sigma_o = 0, sigma_m = 0, sigma_om = 0;
gfloat tmp1 = 0, tmp2 = 0;
gfloat elsumm = 0;
gint weight_y_base, weight_x_base;
gint weight_offset;
gint pixel_offset;
gint winstart_y;
gint wghstart_y;
gint winend_y;
gint winstart_x;
gint wghstart_x;
gint winend_x;
gfloat weight;
gint source_offset;
source_offset = oy * ssim->width + ox;
winstart_x = ssim->windows[source_offset].x_window_start;
wghstart_x = ssim->windows[source_offset].x_weight_start;
winend_x = ssim->windows[source_offset].x_window_end;
winstart_y = ssim->windows[source_offset].y_window_start;
wghstart_y = ssim->windows[source_offset].y_weight_start;
winend_y = ssim->windows[source_offset].y_window_end;
elsumm = ssim->windows[source_offset].element_summ;
weight_y_base = wghstart_y - winstart_y;
weight_x_base = wghstart_x - winstart_x;
switch (ssim->windowtype) {
case 0:
for (iy = winstart_y; iy <= winend_y; iy++) {
guint8 *org_with_offset, *mod_with_offset;
pixel_offset = iy * ssim->width;
org_with_offset = &org[pixel_offset];
mod_with_offset = &mod[pixel_offset];
for (ix = winstart_x; ix <= winend_x; ix++) {
tmp1 = org_with_offset[ix] - mu_o;
sigma_o += tmp1 * tmp1;
tmp2 = mod_with_offset[ix] - mu_m;
sigma_m += tmp2 * tmp2;
sigma_om += tmp1 * tmp2;
}
}
break;
case 1:
weight_y_base = wghstart_y - winstart_y;
weight_x_base = wghstart_x - winstart_x;
for (iy = winstart_y; iy <= winend_y; iy++) {
guint8 *org_with_offset, *mod_with_offset;
gfloat *weights_with_offset;
gfloat wt1, wt2;
pixel_offset = iy * ssim->width;
weight_offset = (weight_y_base + iy) * ssim->windowsize +
weight_x_base;
org_with_offset = &org[pixel_offset];
mod_with_offset = &mod[pixel_offset];
weights_with_offset = &ssim->weights[weight_offset];
for (ix = winstart_x; ix <= winend_x; ix++) {
weight = weights_with_offset[ix];
tmp1 = org_with_offset[ix] - mu_o;
tmp2 = mod_with_offset[ix] - mu_m;
wt1 = weight * tmp1;
wt2 = weight * tmp2;
sigma_o += wt1 * tmp1;
sigma_m += wt2 * tmp2;
sigma_om += wt1 * tmp2;
}
}
break;
}
sigma_o = sqrt (sigma_o / elsumm);
sigma_m = sqrt (sigma_m / elsumm);
sigma_om = sigma_om / elsumm;
tmp1 = (2 * mu_o * mu_m + ssim->const1) * (2 * sigma_om + ssim->const2) /
((mu_o * mu_o + mu_m * mu_m + ssim->const1) *
(sigma_o * sigma_o + sigma_m * sigma_m + ssim->const2));
/* SSIM can go negative, that's why it is
127 + index * 128 instead of index * 255 */
out[oy * ssim->width + ox] = 127 + tmp1 * 128;
*lowest = MIN (*lowest, tmp1);
*highest = MAX (*highest, tmp1);
cumulative_ssim += tmp1;
}
}
*mean = cumulative_ssim / (ssim->width * ssim->height);
}
static void
calcssim_canonical (GstSSim * ssim, guint8 * org, gfloat * orgmu, guint8 * mod,
guint8 * out, gfloat * mean, gfloat * lowest, gfloat * highest)
{
gint oy, ox, iy, ix;
gfloat cumulative_ssim = 0;
*lowest = G_MAXFLOAT;
*highest = -G_MAXFLOAT;
for (oy = 0; oy < ssim->height; oy++) {
for (ox = 0; ox < ssim->width; ox++) {
gfloat mu_o = 0, mu_m = 0;
gdouble sigma_o = 0, sigma_m = 0, sigma_om = 0;
gfloat tmp1, tmp2;
gfloat elsumm = 0;
gint weight_y_base, weight_x_base;
gint weight_offset;
gint pixel_offset;
gint winstart_y;
gint wghstart_y;
gint winend_y;
gint winstart_x;
gint wghstart_x;
gint winend_x;
gfloat weight;
gint source_offset;
source_offset = oy * ssim->width + ox;
winstart_x = ssim->windows[source_offset].x_window_start;
wghstart_x = ssim->windows[source_offset].x_weight_start;
winend_x = ssim->windows[source_offset].x_window_end;
winstart_y = ssim->windows[source_offset].y_window_start;
wghstart_y = ssim->windows[source_offset].y_weight_start;
winend_y = ssim->windows[source_offset].y_window_end;
elsumm = ssim->windows[source_offset].element_summ;
switch (ssim->windowtype) {
case 0:
for (iy = winstart_y; iy <= winend_y; iy++) {
pixel_offset = iy * ssim->width;
for (ix = winstart_x; ix <= winend_x; ix++) {
mu_m += mod[pixel_offset + ix];
}
}
mu_m = mu_m / elsumm;
mu_o = orgmu[oy * ssim->width + ox];
for (iy = winstart_y; iy <= winend_y; iy++) {
pixel_offset = iy * ssim->width;
for (ix = winstart_x; ix <= winend_x; ix++) {
tmp1 = org[pixel_offset + ix] - mu_o;
tmp2 = mod[pixel_offset + ix] - mu_m;
sigma_o += tmp1 * tmp1;
sigma_m += tmp2 * tmp2;
sigma_om += tmp1 * tmp2;
}
}
break;
case 1:
weight_y_base = wghstart_y - winstart_y;
weight_x_base = wghstart_x - winstart_x;
for (iy = winstart_y; iy <= winend_y; iy++) {
pixel_offset = iy * ssim->width;
weight_offset = (weight_y_base + iy) * ssim->windowsize +
weight_x_base;
for (ix = winstart_x; ix <= winend_x; ix++) {
weight = ssim->weights[weight_offset + ix];
mu_o += weight * org[pixel_offset + ix];
mu_m += weight * mod[pixel_offset + ix];
}
}
mu_m = mu_m / elsumm;
mu_o = orgmu[oy * ssim->width + ox];
for (iy = winstart_y; iy <= winend_y; iy++) {
gfloat *weights_with_offset;
guint8 *org_with_offset, *mod_with_offset;
gfloat wt1, wt2;
pixel_offset = iy * ssim->width;
weight_offset = (weight_y_base + iy) * ssim->windowsize +
weight_x_base;
weights_with_offset = &ssim->weights[weight_offset];
org_with_offset = &org[pixel_offset];
mod_with_offset = &mod[pixel_offset];
for (ix = winstart_x; ix <= winend_x; ix++) {
weight = weights_with_offset[ix];
tmp1 = org_with_offset[ix] - mu_o;
tmp2 = mod_with_offset[ix] - mu_m;
wt1 = weight * tmp1;
wt2 = weight * tmp2;
sigma_o += wt1 * tmp1;
sigma_m += wt2 * tmp2;
sigma_om += wt1 * tmp2;
}
}
break;
}
sigma_o = sqrt (sigma_o / elsumm);
sigma_m = sqrt (sigma_m / elsumm);
sigma_om = sigma_om / elsumm;
tmp1 = (2 * mu_o * mu_m + ssim->const1) * (2 * sigma_om + ssim->const2) /
((mu_o * mu_o + mu_m * mu_m + ssim->const1) *
(sigma_o * sigma_o + sigma_m * sigma_m + ssim->const2));
/* SSIM can go negative, that's why it is
127 + index * 128 instead of index * 255 */
out[oy * ssim->width + ox] = 127 + tmp1 * 128;
*lowest = MIN (*lowest, tmp1);
*highest = MAX (*highest, tmp1);
cumulative_ssim += tmp1;
}
}
*mean = cumulative_ssim / (ssim->width * ssim->height);
}
/* the first caps we receive on any of the sinkpads will define the caps for all
* the other sinkpads because we can only measure streams with the same caps.
*/
static gboolean
gst_ssim_setcaps (GstPad * pad, GstCaps * caps)
{
GstSSim *ssim;
GList *pads;
const char *media_type;
GstStructure *capsstr;
gint width, height, fps_n, fps_d;
guint32 fourcc;
ssim = GST_SSIM (GST_PAD_PARENT (pad));
GST_DEBUG_OBJECT (ssim, "setting caps on pad %p,%s to %" GST_PTR_FORMAT, pad,
GST_PAD_NAME (pad), caps);
capsstr = gst_caps_get_structure (caps, 0);
gst_structure_get_int (capsstr, "width", &width);
gst_structure_get_int (capsstr, "height", &height);
gst_structure_get_fraction (capsstr, "framerate", &fps_n, &fps_d);
gst_structure_get_fourcc (capsstr, "format", &fourcc);
GST_OBJECT_LOCK (ssim);
/* Sink caps are stored only once. At the moment it doesn't feel
* right to measure streams with variable caps.
*/
if (G_UNLIKELY (!ssim->sinkcaps)) {
GstStructure *newstr;
GValue list = { 0, }
, fourcc = {
0,};
g_value_init (&list, GST_TYPE_LIST);
g_value_init (&fourcc, GST_TYPE_FOURCC);
gst_value_set_fourcc (&fourcc, GST_MAKE_FOURCC ('I', '4', '2', '0'));
gst_value_list_append_value (&list, &fourcc);
gst_value_set_fourcc (&fourcc, GST_MAKE_FOURCC ('Y', 'V', '1', '2'));
gst_value_list_append_value (&list, &fourcc);
gst_value_set_fourcc (&fourcc, GST_MAKE_FOURCC ('Y', '4', '1', 'B'));
gst_value_list_append_value (&list, &fourcc);
gst_value_set_fourcc (&fourcc, GST_MAKE_FOURCC ('Y', '4', '2', 'B'));
gst_value_list_append_value (&list, &fourcc);
newstr = gst_structure_new ("video/x-raw-yuv", NULL);
gst_structure_set (newstr, "width", G_TYPE_INT, width, NULL);
gst_structure_set (newstr, "height", G_TYPE_INT, height, NULL);
gst_structure_set_value (newstr, "format", &list);
ssim->sinkcaps = gst_caps_new_full (newstr, NULL);
g_value_unset (&list);
g_value_unset (&fourcc);
}
if (G_UNLIKELY (!ssim->srccaps)) {
GstStructure *newstr;
newstr = gst_structure_new ("video/x-raw-gray", NULL);
gst_structure_set (newstr, "width", G_TYPE_INT, width, NULL);
gst_structure_set (newstr, "height", G_TYPE_INT, height, NULL);
gst_structure_set (newstr, "framerate", GST_TYPE_FRACTION, fps_n, fps_d,
NULL);
/* Calculates SSIM only for Y channel, hence the output is monochrome.
* TODO: an option (a mask?) to calculate SSIM for more than one channel,
* will probably output RGB, one metric per channel...that would
* look kinda funny :)
*/
gst_structure_set (newstr, "bpp", G_TYPE_INT, 8, "depth", G_TYPE_INT, 8,
NULL);
ssim->srccaps = gst_caps_new_full (newstr, NULL);
}
pads = GST_ELEMENT (ssim)->pads;
while (pads) {
GstPadDirection direction;
GstPad *otherpad = GST_PAD (pads->data);
direction = gst_pad_get_direction (otherpad);
GST_DEBUG_OBJECT (ssim, "checking caps on pad %p", otherpad);
if (direction == GST_PAD_SINK) {
gchar *capstr;
capstr = gst_caps_to_string (GST_PAD_CAPS (otherpad));
GST_DEBUG_OBJECT (ssim, "old caps on pad %p,%s were %s", otherpad,
GST_PAD_NAME (otherpad), capstr);
g_free (capstr);
gst_caps_replace (&GST_PAD_CAPS (otherpad), ssim->sinkcaps);
capstr = gst_caps_to_string (ssim->sinkcaps);
GST_DEBUG_OBJECT (ssim, "new caps on pad %p,%s are %s", otherpad,
GST_PAD_NAME (otherpad), capstr);
g_free (capstr);
} else if (direction == GST_PAD_SRC) {
gst_caps_replace (&GST_PAD_CAPS (otherpad), ssim->srccaps);
}
pads = g_list_next (pads);
}
/* parse caps now */
media_type = gst_structure_get_name (capsstr);
GST_DEBUG_OBJECT (ssim, "media type is %s", media_type);
if (strcmp (media_type, "video/x-raw-yuv") == 0) {
ssim->width = width;
ssim->height = height;
ssim->frame_rate = fps_n;
ssim->frame_rate_base = fps_d;
GST_INFO_OBJECT (ssim, "parse_caps sets ssim to yuv format "
"%d, %dx%d, %d/%d fps", fourcc, ssim->width, ssim->height,
ssim->frame_rate, ssim->frame_rate_base);
/* Only planar formats are supported.
* TODO: implement support for interleaved formats
* Only YUV formats are supported. There's no sense in calculating the
* index for R, G or B channels separately.
*/
switch (fourcc) {
case GST_MAKE_FOURCC ('I', '4', '2', '0'):
case GST_MAKE_FOURCC ('Y', 'V', '1', '2'):
case GST_MAKE_FOURCC ('Y', '4', '1', 'B'):
case GST_MAKE_FOURCC ('Y', '4', '2', 'B'):
break;
default:
goto not_supported;
}
} else {
goto not_supported;
}
GST_OBJECT_UNLOCK (ssim);
return TRUE;
/* ERRORS */
not_supported:
{
GST_OBJECT_UNLOCK (ssim);
GST_DEBUG_OBJECT (ssim, "unsupported format set as caps");
return FALSE;
}
}
static gboolean
gst_ssim_query_latency (GstSSim * ssim, GstQuery * query)
{
GstClockTime min, max;
gboolean live;
gboolean res;
GstIterator *it;
gboolean done;
res = TRUE;
done = FALSE;
live = FALSE;
min = 0;
max = GST_CLOCK_TIME_NONE;
/* Take maximum of all latency values */
it = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (ssim));
while (!done) {
GstIteratorResult ires;
gpointer item;
ires = gst_iterator_next (it, &item);
switch (ires) {
case GST_ITERATOR_DONE:
done = TRUE;
break;
case GST_ITERATOR_OK:
{
GstPad *pad = GST_PAD_CAST (item);
GstQuery *peerquery;
GstClockTime min_cur, max_cur;
gboolean live_cur;
peerquery = gst_query_new_latency ();
/* Ask peer for latency */
res &= gst_pad_peer_query (pad, peerquery);
/* take max from all valid return values */
if (res) {
gst_query_parse_latency (peerquery, &live_cur, &min_cur, &max_cur);
if (min_cur > min)
min = min_cur;
if (max_cur != GST_CLOCK_TIME_NONE &&
((max != GST_CLOCK_TIME_NONE && max_cur > max) ||
(max == GST_CLOCK_TIME_NONE)))
max = max_cur;
live = live || live_cur;
}
gst_query_unref (peerquery);
gst_object_unref (pad);
break;
}
case GST_ITERATOR_RESYNC:
live = FALSE;
min = 0;
max = GST_CLOCK_TIME_NONE;
res = TRUE;
gst_iterator_resync (it);
break;
default:
res = FALSE;
done = TRUE;
break;
}
}
gst_iterator_free (it);
if (res) {
/* store the results */
GST_DEBUG_OBJECT (ssim, "Calculated total latency: live %s, min %"
GST_TIME_FORMAT ", max %" GST_TIME_FORMAT,
(live ? "yes" : "no"), GST_TIME_ARGS (min), GST_TIME_ARGS (max));
gst_query_set_latency (query, live, min, max);
}
return res;
}
static gboolean
gst_ssim_query_duration (GstSSim * ssim, GstQuery * query)
{
gint64 max, min;
gboolean res;
GstFormat format;
GstIterator *it;
gboolean done;
/* parse format */
gst_query_parse_duration (query, &format, NULL);
max = -1;
min = G_MAXINT64;
res = TRUE;
done = FALSE;
it = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (ssim));
while (!done) {
GstIteratorResult ires;
gpointer item;
ires = gst_iterator_next (it, &item);
switch (ires) {
case GST_ITERATOR_DONE:
done = TRUE;
break;
case GST_ITERATOR_OK:
{
GstPad *pad = GST_PAD_CAST (item);
gint64 duration;
/* ask sink peer for duration */
res &= gst_pad_query_peer_duration (pad, &format, &duration);
/* take min&max from all valid return values */
if (res) {
/* valid unknown length, stop searching */
if (duration == -1) {
max = duration;
done = TRUE;
}
/* else see if bigger than current max */
else {
if (duration > max)
max = duration;
if (duration < min)
min = duration;
}
}
gst_object_unref (pad);
break;
}
case GST_ITERATOR_RESYNC:
max = -1;
min = G_MAXINT64;
res = TRUE;
gst_iterator_resync (it);
break;
default:
res = FALSE;
done = TRUE;
break;
}
}
gst_iterator_free (it);
if (res) {
/* and store the max */
GST_DEBUG_OBJECT (ssim, "Total duration in format %s: %"
GST_TIME_FORMAT, gst_format_get_name (format), GST_TIME_ARGS (min));
gst_query_set_duration (query, format, min);
}
return res;
}
static gboolean
gst_ssim_query (GstPad * pad, GstQuery * query)
{
GstSSim *ssim = GST_SSIM (gst_pad_get_parent (pad));
gboolean res = FALSE;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_POSITION:
{
GstFormat format;
gst_query_parse_position (query, &format, NULL);
switch (format) {
case GST_FORMAT_TIME:
/* FIXME, bring to stream time, might be tricky */
gst_query_set_position (query, format, ssim->timestamp);
res = TRUE;
break;
case GST_FORMAT_DEFAULT:
gst_query_set_position (query, format, ssim->offset);
res = TRUE;
break;
default:
break;
}
break;
}
case GST_QUERY_DURATION:
res = gst_ssim_query_duration (ssim, query);
break;
case GST_QUERY_LATENCY:
res = gst_ssim_query_latency (ssim, query);
break;
default:
/* FIXME, needs a custom query handler because we have multiple
* sinkpads
*/
res = gst_pad_query_default (pad, query);
break;
}
gst_object_unref (ssim);
return res;
}
static gboolean
forward_event_func (GstPad * pad, GValue * ret, GstEvent * event)
{
gst_event_ref (event);
GST_LOG_OBJECT (pad, "About to send event %s", GST_EVENT_TYPE_NAME (event));
if (!gst_pad_push_event (pad, event)) {
g_value_set_boolean (ret, FALSE);
GST_LOG_OBJECT (pad, "Sending event %p (%s) failed.",
event, GST_EVENT_TYPE_NAME (event));
} else {
GST_LOG_OBJECT (pad, "Sent event %p (%s).",
event, GST_EVENT_TYPE_NAME (event));
}
gst_object_unref (pad);
return TRUE;
}
/* forwards the event to all sinkpads, takes ownership of the
* event
*
* Returns: TRUE if the event could be forwarded on all
* sinkpads.
*/
static gboolean
forward_event (GstSSim * ssim, GstEvent * event)
{
GstIterator *it;
GValue vret = { 0 };
GST_LOG_OBJECT (ssim, "Forwarding event %p (%s)", event,
GST_EVENT_TYPE_NAME (event));
g_value_init (&vret, G_TYPE_BOOLEAN);
g_value_set_boolean (&vret, TRUE);
it = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (ssim));
gst_iterator_fold (it, (GstIteratorFoldFunction) forward_event_func, &vret,
event);
gst_iterator_free (it);
gst_event_unref (event);
return g_value_get_boolean (&vret);
}
static gboolean
gst_ssim_src_event (GstPad * pad, GstEvent * event)
{
GstSSim *ssim;
gboolean result;
ssim = GST_SSIM (gst_pad_get_parent (pad));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_QOS:
/* QoS might be tricky */
result = FALSE;
break;
case GST_EVENT_SEEK:
{
GstSeekFlags flags;
GstSeekType curtype;
gint64 cur;
/* parse the seek parameters */
gst_event_parse_seek (event, &ssim->segment_rate, NULL, &flags, &curtype,
&cur, NULL, NULL);
/* check if we are flushing */
if (flags & GST_SEEK_FLAG_FLUSH) {
/* make sure we accept nothing anymore and return WRONG_STATE */
gst_collect_pads_set_flushing (ssim->collect, TRUE);
/* flushing seek, start flush downstream, the flush will be done
* when all pads received a FLUSH_STOP. */
gst_pad_push_event (pad, gst_event_new_flush_start ());
}
/* now wait for the collected to be finished and mark a new
* segment */
GST_OBJECT_LOCK (ssim->collect);
if (curtype == GST_SEEK_TYPE_SET)
ssim->segment_position = cur;
else
ssim->segment_position = 0;
{
GstSSimOutputContext *c;
gint i = 0;
for (i = 0; i < ssim->src->len; i++) {
c = (GstSSimOutputContext *) g_ptr_array_index (ssim->src, i);
c->segment_pending = TRUE;
}
}
GST_OBJECT_UNLOCK (ssim->collect);
result = forward_event (ssim, event);
break;
}
case GST_EVENT_NAVIGATION:
/* navigation is rather pointless. */
result = FALSE;
break;
default:
/* just forward the rest for now */
result = forward_event (ssim, event);
break;
}
gst_object_unref (ssim);
return result;
}
static gboolean
gst_ssim_sink_event (GstPad * pad, GstEvent * event)
{
GstSSim *ssim;
gboolean ret;
ssim = GST_SSIM (gst_pad_get_parent (pad));
GST_DEBUG ("Got %s event on pad %s:%s", GST_EVENT_TYPE_NAME (event),
GST_DEBUG_PAD_NAME (pad));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_NEWSEGMENT:
{
gboolean update;
gdouble rate;
gdouble applied_rate;
GstFormat format;
gint64 start;
gint64 stop;
gint64 position;
gst_event_parse_new_segment_full (event, &update, &rate, &applied_rate,
&format, &start, &stop, &position);
GST_DEBUG ("NEWSEGMENTEVENT: update(%d), rate(%f), app_rate(%f), "
"format(%d), start(%" GST_TIME_FORMAT ") stop(%" GST_TIME_FORMAT ") "
"position(%" GST_TIME_FORMAT ")", update, rate, applied_rate, format,
GST_TIME_ARGS (start), GST_TIME_ARGS (stop),
GST_TIME_ARGS (position));
break;
}
case GST_EVENT_FLUSH_STOP:
/* mark a pending new segment. This event is synchronized
* with the streaming thread so we can safely update the
* variable without races. It's somewhat weird because we
* assume the collectpads forwarded the FLUSH_STOP past us
* and downstream (using our source pad, the bastard!).
*/
{
GstSSimOutputContext *c;
gint i = 0;
for (i = 0; i < ssim->src->len; i++) {
c = (GstSSimOutputContext *) g_ptr_array_index (ssim->src, i);
c->segment_pending = TRUE;
}
}
break;
default:
break;
}
/* now GstCollectPads can take care of the rest, e.g. EOS */
GST_DEBUG ("Dispatching %s event on pad %s:%s", GST_EVENT_TYPE_NAME (event),
GST_DEBUG_PAD_NAME (pad));
ret = ssim->collect_event (pad, event);
GST_DEBUG ("Event %s on pad %s:%s is dispatched", GST_EVENT_TYPE_NAME (event),
GST_DEBUG_PAD_NAME (pad));
gst_object_unref (ssim);
return ret;
}
static void
gst_ssim_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstSSim *ssim;
ssim = GST_SSIM (object);
switch (prop_id) {
case PROP_SSIM_TYPE:
ssim->ssimtype = g_value_get_int (value);
break;
case PROP_WINDOW_TYPE:
ssim->windowtype = g_value_get_int (value);
g_free (ssim->windows);
ssim->windows = NULL;
break;
case PROP_WINDOW_SIZE:
ssim->windowsize = g_value_get_int (value);
g_free (ssim->windows);
ssim->windows = NULL;
break;
case PROP_GAUSS_SIGMA:
ssim->sigma = g_value_get_float (value);
g_free (ssim->windows);
ssim->windows = NULL;
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_ssim_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstSSim *ssim;
ssim = GST_SSIM (object);
switch (prop_id) {
case PROP_SSIM_TYPE:
g_value_set_int (value, ssim->ssimtype);
break;
case PROP_WINDOW_TYPE:
g_value_set_int (value, ssim->windowtype);
break;
case PROP_WINDOW_SIZE:
g_value_set_int (value, ssim->windowsize);
break;
case PROP_GAUSS_SIGMA:
g_value_set_float (value, ssim->sigma);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_ssim_class_init (GstSSimClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstElementClass *gstelement_class = (GstElementClass *) klass;
gobject_class->set_property = gst_ssim_set_property;
gobject_class->get_property = gst_ssim_get_property;
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_ssim_finalize);
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SSIM_TYPE,
g_param_spec_int ("ssim-type", "SSIM type",
"Type of the SSIM metric. 0 - canonical. 1 - with fixed mu "
"(almost the same results, but roughly 20% faster)",
0, 1, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_WINDOW_TYPE,
g_param_spec_int ("window-type", "Window type",
"Type of the weighting in the window. "
"0 - no weighting. 1 - Gaussian weighting (controlled by \"sigma\")",
0, 1, 1, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_WINDOW_SIZE,
g_param_spec_int ("window-size", "Window size",
"Size of a window.", 1, 22, 11,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_GAUSS_SIGMA,
g_param_spec_float ("gauss-sigma", "Deviation (for Gauss function)",
"Used to calculate Gussian weights "
"(only when using Gaussian window).",
G_MINFLOAT, 10, 1.5, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_ssim_src_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_ssim_sink_original_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_ssim_sink_modified_template));
gst_element_class_set_static_metadata (gstelement_class, "SSim",
"Filter/Analyzer/Video",
"Calculate Y-SSIM for n+2 YUV video streams",
"Руслан Ижбулатов <lrn1986 _at_ gmail _dot_ com>");
parent_class = g_type_class_peek_parent (klass);
gstelement_class->request_new_pad =
GST_DEBUG_FUNCPTR (gst_ssim_request_new_pad);
gstelement_class->release_pad = GST_DEBUG_FUNCPTR (gst_ssim_release_pad);
gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_ssim_change_state);
}
static GstPad *
gst_ssim_request_new_pad (GstElement * element, GstPadTemplate * templ,
const gchar * padname)
{
gchar *name;
GstSSim *ssim;
GstPad *newpad;
GstPad *newsrc;
gint padcount;
GstPadTemplate *template;
guint num = -1;
if (templ->direction != GST_PAD_SINK)
goto not_sink;
ssim = GST_SSIM (element);
padcount = ssim->padcount;
GST_DEBUG_OBJECT (ssim, "number of pads = %d", padcount);
if (padname)
GST_DEBUG_OBJECT (ssim, "reqested pad %s", padname);
else
goto unnamed_pad;
if (strcmp (padname, "original") == 0) {
newpad = gst_pad_new_from_template (templ, "original");
GST_DEBUG_OBJECT (ssim, "request new sink pad original");
ssim->orig = newpad;
} else if (strncmp (padname, "modified_", 9) == 0) {
const gchar *numstr = &padname[9];
num = strtoul (numstr, NULL, 10);
if (errno == EINVAL || errno == ERANGE)
goto bad_name;
newpad = gst_pad_new_from_template (templ, padname);
GST_DEBUG_OBJECT (ssim, "request new sink pad %s", padname);
} else
goto bad_name;
gst_pad_set_getcaps_function (newpad,
GST_DEBUG_FUNCPTR (gst_ssim_sink_getcaps));
gst_pad_set_setcaps_function (newpad, GST_DEBUG_FUNCPTR (gst_ssim_setcaps));
gst_collect_pads_add_pad (ssim->collect, newpad, sizeof (GstCollectData),
NULL, TRUE);
/* FIXME: hacked way to override/extend the event function of
* GstCollectPads; because it sets its own event function giving the
* element no access to events
*/
GST_DEBUG_OBJECT (ssim, "Current collect_event is %p, changing to %p",
ssim->collect_event, GST_PAD_EVENTFUNC (newpad));
ssim->collect_event = (GstPadEventFunction) GST_PAD_EVENTFUNC (newpad);
gst_pad_set_event_function (newpad, GST_DEBUG_FUNCPTR (gst_ssim_sink_event));
GST_DEBUG_OBJECT (ssim, "Adding a pad...");
/* takes ownership of the pad */
if (!gst_element_add_pad (GST_ELEMENT (ssim), newpad))
goto could_not_add_sink;
else
/* increment pad counter */
#if GLIB_CHECK_VERSION(2,29,5)
padcount = g_atomic_int_add (&ssim->padcount, 1);
#else
padcount = g_atomic_int_exchange_and_add (&ssim->padcount, 1);
#endif
if (num != -1) {
GstSSimOutputContext *c;
template = gst_static_pad_template_get (&gst_ssim_src_template);
name = g_strdup_printf ("src_%u", num);
newsrc = gst_pad_new_from_template (template, name);
GST_DEBUG_OBJECT (ssim, "creating src pad %s", name);
g_free (name);
gst_object_unref (template);
gst_pad_set_getcaps_function (newsrc,
GST_DEBUG_FUNCPTR (gst_ssim_src_getcaps));
gst_pad_set_query_function (newsrc, GST_DEBUG_FUNCPTR (gst_ssim_query));
gst_pad_set_event_function (newsrc, GST_DEBUG_FUNCPTR (gst_ssim_src_event));
if (!gst_element_add_pad (GST_ELEMENT (ssim), newsrc))
goto could_not_add_src;
c = g_new (GstSSimOutputContext, 1);
c->pad = newsrc;
g_object_set_data (G_OBJECT (newpad), "ssim-match-output-context", c);
g_ptr_array_add (ssim->src, (gpointer) c);
}
return newpad;
/* errors */
bad_name:
{
g_warning ("gstssim: request new pad with bad name %s (must be "
"'modified')\n", padname);
return NULL;
}
unnamed_pad:
{
g_warning ("gstssim: request new pad without a name (must be "
"'modified')\n");
return NULL;
}
not_sink:
{
g_warning ("gstssim: request new pad that is not a SINK pad\n");
return NULL;
}
could_not_add_src:
{
GST_DEBUG_OBJECT (ssim, "could not add src pad");
gst_object_unref (newsrc);
}
could_not_add_sink:
{
GST_DEBUG_OBJECT (ssim, "could not add sink pad");
gst_collect_pads_remove_pad (ssim->collect, newpad);
gst_object_unref (newpad);
return NULL;
}
}
static void
gst_ssim_release_pad (GstElement * element, GstPad * pad)
{
GstSSim *ssim;
ssim = GST_SSIM (element);
GST_DEBUG_OBJECT (ssim, "release pad %s:%s", GST_DEBUG_PAD_NAME (pad));
gst_collect_pads_remove_pad (ssim->collect, pad);
gst_element_remove_pad (element, pad);
}
static void
gst_ssim_init (GstSSim * ssim)
{
ssim->windowsize = 11;
ssim->windowtype = 1;
ssim->windows = NULL;
ssim->sigma = 1.5;
ssim->ssimtype = 0;
ssim->src = g_ptr_array_new ();
ssim->padcount = 0;
ssim->collect_event = NULL;
ssim->sinkcaps = NULL;
/* keep track of the sinkpads requested */
ssim->collect = gst_collect_pads_new ();
gst_collect_pads_set_function (ssim->collect,
GST_DEBUG_FUNCPTR (gst_ssim_collected), ssim);
}
static void
gst_ssim_finalize (GObject * object)
{
GstSSim *ssim = GST_SSIM (object);
gst_object_unref (ssim->collect);
ssim->collect = NULL;
g_free (ssim->windows);
ssim->windows = NULL;
g_free (ssim->weights);
ssim->weights = NULL;
if (ssim->sinkcaps)
gst_caps_unref (ssim->sinkcaps);
if (ssim->srccaps)
gst_caps_unref (ssim->srccaps);
g_ptr_array_free (ssim->src, TRUE);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
typedef gfloat (*GstSSimWeightFunc) (GstSSim * ssim, gint y, gint x);
static gfloat
gst_ssim_weight_func_none (GstSSim * ssim, gint y, gint x)
{
return 1;
}
static gfloat
gst_ssim_weight_func_gauss (GstSSim * ssim, gint y, gint x)
{
gfloat coord = sqrt (x * x + y * y);
return exp (-1 * (coord * coord) / (2 * ssim->sigma * ssim->sigma)) /
(ssim->sigma * sqrt (2 * G_PI));
}
static gboolean
gst_ssim_regenerate_windows (GstSSim * ssim)
{
gint windowiseven;
gint y, x, y2, x2;
GstSSimWeightFunc func;
gfloat normal_summ = 0;
gint normal_count = 0;
g_free (ssim->weights);
ssim->weights = g_new (gfloat, ssim->windowsize * ssim->windowsize);
windowiseven = ((gint) ssim->windowsize / 2) * 2 == ssim->windowsize ? 1 : 0;
g_free (ssim->windows);
ssim->windows = g_new (GstSSimWindowCache, ssim->height * ssim->width);
switch (ssim->windowtype) {
case 0:
func = gst_ssim_weight_func_none;
break;
case 1:
func = gst_ssim_weight_func_gauss;
break;
default:
GST_WARNING_OBJECT (ssim, "unknown window type - %d. Defaulting to %d",
ssim->windowtype, 1);
ssim->windowtype = 1;
func = gst_ssim_weight_func_gauss;
}
for (y = 0; y < ssim->windowsize; y++) {
gint yoffset = y * ssim->windowsize;
for (x = 0; x < ssim->windowsize; x++) {
ssim->weights[yoffset + x] = func (ssim, x - ssim->windowsize / 2 +
windowiseven, y - ssim->windowsize / 2 + windowiseven);
normal_summ += ssim->weights[yoffset + x];
normal_count++;
}
}
for (y = 0; y < ssim->height; y++) {
for (x = 0; x < ssim->width; x++) {
GstSSimWindowCache win;
gint element_count = 0;
win.x_window_start = x - ssim->windowsize / 2 + windowiseven;
win.x_weight_start = 0;
if (win.x_window_start < 0) {
win.x_weight_start = -win.x_window_start;
win.x_window_start = 0;
}
win.x_window_end = x + ssim->windowsize / 2;
if (win.x_window_end >= ssim->width)
win.x_window_end = ssim->width - 1;
win.y_window_start = y - ssim->windowsize / 2 + windowiseven;
win.y_weight_start = 0;
if (win.y_window_start < 0) {
win.y_weight_start = -win.y_window_start;
win.y_window_start = 0;
}
win.y_window_end = y + ssim->windowsize / 2;
if (win.y_window_end >= ssim->height)
win.y_window_end = ssim->height - 1;
win.element_summ = 0;
element_count = (win.y_window_end - win.y_window_start + 1) *
(win.x_window_end - win.x_window_start + 1);
if (element_count == normal_count)
win.element_summ = normal_summ;
else {
for (y2 = win.y_weight_start; y2 < ssim->windowsize; y2++) {
for (x2 = win.x_weight_start; x2 < ssim->windowsize; x2++) {
win.element_summ += ssim->weights[y2 * ssim->windowsize + x2];
}
}
}
ssim->windows[(y * ssim->width + x)] = win;
}
}
/* FIXME: while 0.01 and 0.03 are pretty much static, the 255 implies that
* we're working with 8-bit-per-color-component format, which may not be true
*/
ssim->const1 = 0.01 * 255 * 0.01 * 255;
ssim->const2 = 0.03 * 255 * 0.03 * 255;
return TRUE;
}
static GstFlowReturn
gst_ssim_collected (GstCollectPads * pads, gpointer user_data)
{
GstSSim *ssim;
GSList *collected;
GstFlowReturn ret = GST_FLOW_OK;
GstBuffer *orgbuf = NULL;
gfloat *orgmu = NULL;
GstBuffer *outbuf = NULL;
gpointer outdata = NULL;
guint outsize = 0;
gfloat mssim = 0, lowest = 1, highest = -1;
gboolean ready = TRUE;
gint padnumber = 0;
ssim = GST_SSIM (user_data);
if (G_UNLIKELY (ssim->windows == NULL)) {
GST_DEBUG_OBJECT (ssim, "Regenerating windows");
gst_ssim_regenerate_windows (ssim);
}
switch (ssim->ssimtype) {
case 0:
ssim->func = (GstSSimFunction) calcssim_canonical;
break;
case 1:
ssim->func = (GstSSimFunction) calcssim_without_mu;
break;
default:
return GST_FLOW_ERROR;
}
for (collected = pads->data; collected; collected = g_slist_next (collected)) {
GstCollectData *collect_data;
GstBuffer *inbuf;
collect_data = (GstCollectData *) collected->data;
inbuf = gst_collect_pads_peek (pads, collect_data);
if (inbuf == NULL) {
GST_LOG_OBJECT (ssim, "channel %p: no bytes available", collect_data);
ready = FALSE;
} else
gst_buffer_unref (inbuf);
}
/* if _collected() was called, all pads should have data, but if
* one of them doesn't, it means that it is EOS and we can't go any further
*
* FIXME, shouldn't we do something about pads that DO have data?
* Flush them or something?
*/
if (G_UNLIKELY (!ready))
goto eos;
/* Mu is just a blur, we can calculate it once */
if (ssim->ssimtype == 0) {
orgmu = g_new (gfloat, ssim->width * ssim->height);
for (collected = pads->data; collected;
collected = g_slist_next (collected)) {
GstCollectData *collect_data;
collect_data = (GstCollectData *) collected->data;
if (collect_data->pad == ssim->orig) {
orgbuf = gst_collect_pads_pop (pads, collect_data);;
GST_DEBUG_OBJECT (ssim, "Original stream - flags(0x%x), timestamp(%"
GST_TIME_FORMAT "), duration(%" GST_TIME_FORMAT ")",
GST_BUFFER_FLAGS (orgbuf),
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (orgbuf)),
GST_TIME_ARGS (GST_BUFFER_DURATION (orgbuf)));
calculate_mu (ssim, orgmu, GST_BUFFER_DATA (orgbuf));
break;
}
}
}
GST_LOG_OBJECT (ssim, "starting to cycle through streams");
for (collected = pads->data; collected; collected = g_slist_next (collected)) {
GstCollectData *collect_data;
GstBuffer *inbuf;
guint8 *indata;
collect_data = (GstCollectData *) collected->data;
if (collect_data->pad != ssim->orig) {
inbuf = gst_collect_pads_pop (pads, collect_data);
indata = GST_BUFFER_DATA (inbuf);
GST_DEBUG_OBJECT (ssim, "Modified stream - flags(0x%x), timestamp(%"
GST_TIME_FORMAT "), duration(%" GST_TIME_FORMAT ")",
GST_BUFFER_FLAGS (inbuf),
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (inbuf)),
GST_TIME_ARGS (GST_BUFFER_DURATION (inbuf)));
if (!GST_BUFFER_FLAG_IS_SET (inbuf, GST_BUFFER_FLAG_GAP)) {
GstSSimOutputContext *c;
GstEvent *measured;
guint64 offset;
GValue vmean = { 0 }
, vlowest = {
0}
, vhighest = {
0};
c = (GstSSimOutputContext *)
g_object_get_data (G_OBJECT (collect_data->pad),
"ssim-match-output-context");
GST_DEBUG_OBJECT (ssim, "Output context is %" GST_PTR_FORMAT
", pad will be %" GST_PTR_FORMAT, c, c->pad);
outsize = GST_ROUND_UP_4 (ssim->width) * ssim->height;
GST_LOG_OBJECT (ssim, "channel %p: making output buffer of %d bytes",
collect_data, outsize);
/* first buffer, alloc outsize.
* FIXME: we can easily subbuffer and _make_writable.
* FIXME: only create empty buffer for first non-gap buffer, so that we
* only use ssim function when really calculating
*/
outbuf = gst_buffer_new_and_alloc (GST_ROUND_UP_4 (ssim->width) *
ssim->height);
outdata = GST_BUFFER_DATA (outbuf);
gst_buffer_set_caps (outbuf, gst_pad_get_fixed_caps_func (c->pad));
/* Videos should match, so the output video has the same characteristics
* as the input video
*/
/* set timestamps on the output buffer */
gst_buffer_copy_metadata (outbuf, inbuf, (GstBufferCopyFlags)
GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS);
g_value_init (&vmean, G_TYPE_FLOAT);
g_value_init (&vlowest, G_TYPE_FLOAT);
g_value_init (&vhighest, G_TYPE_FLOAT);
GST_LOG_OBJECT (ssim, "channel %p: calculating SSIM", collect_data);
ssim->func (ssim, GST_BUFFER_DATA (orgbuf), orgmu, indata, outdata,
&mssim, &lowest, &highest);
GST_DEBUG_OBJECT (GST_OBJECT (ssim), "MSSIM is %f, l-h is %f - %f",
mssim, lowest, highest);
gst_ssim_post_message (ssim, outbuf, mssim, lowest, highest);
g_value_set_float (&vmean, mssim);
g_value_set_float (&vlowest, lowest);
g_value_set_float (&vhighest, highest);
offset = GST_BUFFER_OFFSET (inbuf);
/* our timestamping is very simple, just an ever incrementing
* counter, the new segment time will take care of their respective
* stream time.
*/
if (c->segment_pending) {
GstEvent *event;
/* FIXME, use rate/applied_rate as set on all sinkpads.
* - currently we just set rate as received from last seek-event
* We could potentially figure out the duration as well using
* the current segment positions and the stated stop positions.
* Also we just start from stream time 0 which is rather
* weird. For non-synchronized mixing, the time should be
* the min of the stream times of all received segments,
* rationale being that the duration is at least going to
* be as long as the earliest stream we start mixing. This
* would also be correct for synchronized mixing but then
* the later streams would be delayed until the stream times`
* match.
*/
event = gst_event_new_new_segment_full (FALSE, ssim->segment_rate,
1.0, GST_FORMAT_TIME, ssim->timestamp, -1,
ssim->segment_position);
gst_pad_push_event (c->pad, event);
c->segment_pending = FALSE;
}
measured = gst_event_new_measured (offset,
GST_BUFFER_TIMESTAMP (inbuf), "SSIM", &vmean, &vlowest, &vhighest);
gst_pad_push_event (c->pad, measured);
/* send it out */
GST_DEBUG_OBJECT (ssim, "pushing outbuf, timestamp %" GST_TIME_FORMAT
", size %d", GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (outbuf)),
GST_BUFFER_SIZE (outbuf));
ret &= gst_pad_push (c->pad, outbuf);
} else {
GST_LOG_OBJECT (ssim, "channel %p: skipping", collect_data);
}
gst_buffer_unref (inbuf);
padnumber++;
}
}
gst_buffer_unref (orgbuf);
if (ssim->ssimtype == 0)
g_free (orgmu);
ssim->segment_position = 0;
return ret;
/* ERRORS */
eos:
{
gint i;
GST_DEBUG_OBJECT (ssim, "no data available, must be EOS");
for (i = 0; i < ssim->src->len; i++) {
GstSSimOutputContext *c =
(GstSSimOutputContext *) g_ptr_array_index (ssim->src, i);
gst_pad_push_event (c->pad, gst_event_new_eos ());
}
return GST_FLOW_UNEXPECTED;
}
}
static GstStateChangeReturn
gst_ssim_change_state (GstElement * element, GstStateChange transition)
{
GstSSim *ssim;
GstStateChangeReturn ret;
ssim = GST_SSIM (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
ssim->timestamp = 0;
ssim->offset = 0;
{
GstSSimOutputContext *c;
gint i = 0;
for (i = 0; i < ssim->src->len; i++) {
c = (GstSSimOutputContext *) g_ptr_array_index (ssim->src, i);
c->segment_pending = TRUE;
}
}
ssim->segment_position = 0;
ssim->segment_rate = 1.0;
gst_segment_init (&ssim->segment, GST_FORMAT_UNDEFINED);
gst_collect_pads_start (ssim->collect);
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
/* need to unblock the collectpads before calling the
* parent change_state so that streaming can finish
*/
gst_collect_pads_stop (ssim->collect);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
default:
break;
}
return ret;
}
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