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gstreamer/gst/videomixer/videomixer.c
Sebastian Dröge f5bca501e5 videomixer: Don't mix input with different pixel aspect ratios 
Fixes bug #618530.
2010-06-01 11:21:29 +02:00

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/* Generic video mixer plugin
* Copyright (C) 2004 Wim Taymans <wim@fluendo.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:element-videomixer
*
* Videomixer can accept AYUV, ARGB and BGRA video streams. For each of the requested
* sink pads it will compare the incoming geometry and framerate to define the
* output parameters. Indeed output video frames will have the geometry of the
* biggest incoming video stream and the framerate of the fastest incoming one.
*
* All sink pads must be either AYUV, ARGB or BGRA, but a mixture of them is not
* supported. The src pad will have the same colorspace as the sinks.
* No colorspace conversion is done.
*
*
* Individual parameters for each input stream can be configured on the
* #GstVideoMixerPad.
*
* <refsect2>
* <title>Sample pipelines</title>
* |[
* gst-launch videotestsrc pattern=1 ! video/x-raw-yuv, framerate=\(fraction\)10/1, width=100, height=100 ! videobox border-alpha=0 alpha=0.5 top=-70 bottom=-70 right=-220 ! videomixer name=mix ! ffmpegcolorspace ! xvimagesink videotestsrc ! video/x-raw-yuv, framerate=\(fraction\)5/1, width=320, height=240 ! alpha alpha=0.7 ! mix.
* ]| A pipeline to demonstrate videomixer used together with videobox.
* This should show a 320x240 pixels video test source with some transparency
* showing the background checker pattern. Another video test source with just
* the snow pattern of 100x100 pixels is overlayed on top of the first one on
* the left vertically centered with a small transparency showing the first
* video test source behind and the checker pattern under it. Note that the
* framerate of the output video is 10 frames per second.
* |[
* gst-launch videotestsrc pattern=1 ! video/x-raw-rgb, framerate=\(fraction\)10/1, width=100, height=100 ! videomixer name=mix ! ffmpegcolorspace ! ximagesink videotestsrc ! video/x-raw-rgb, framerate=\(fraction\)5/1, width=320, height=240 ! mix.
* ]| A pipeline to demostrate bgra mixing. (This does not demonstrate alpha blending).
* |[
* gst-launch videotestsrc pattern=1 ! video/x-raw-yuv,format =\(fourcc\)I420, framerate=\(fraction\)10/1, width=100, height=100 ! videomixer name=mix ! ffmpegcolorspace ! ximagesink videotestsrc ! video/x-raw-yuv,format=\(fourcc\)I420, framerate=\(fraction\)5/1, width=320, height=240 ! mix.
* ]| A pipeline to test I420
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_GCC_ASM
#if defined(HAVE_CPU_I386) || defined(HAVE_CPU_X86_64)
#define BUILD_X86_ASM
#endif
#endif
#include <gst/gst.h>
#include <gst/base/gstcollectpads.h>
#include <gst/controller/gstcontroller.h>
#include <gst/video/video.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include "videomixer.h"
GST_DEBUG_CATEGORY (gst_videomixer_debug);
#define GST_VIDEO_MIXER_GET_STATE_LOCK(mix) \
(GST_VIDEO_MIXER(mix)->state_lock)
#define GST_VIDEO_MIXER_STATE_LOCK(mix) \
(g_mutex_lock(GST_VIDEO_MIXER_GET_STATE_LOCK (mix)))
#define GST_VIDEO_MIXER_STATE_UNLOCK(mix) \
(g_mutex_unlock(GST_VIDEO_MIXER_GET_STATE_LOCK (mix)))
static GType gst_videomixer_get_type (void);
static void gst_videomixer_pad_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_videomixer_pad_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static gboolean gst_videomixer_src_event (GstPad * pad, GstEvent * event);
static gboolean gst_videomixer_sink_event (GstPad * pad, GstEvent * event);
static void gst_videomixer_sort_pads (GstVideoMixer * mix);
#define DEFAULT_PAD_ZORDER 0
#define DEFAULT_PAD_XPOS 0
#define DEFAULT_PAD_YPOS 0
#define DEFAULT_PAD_ALPHA 1.0
enum
{
PROP_PAD_0,
PROP_PAD_ZORDER,
PROP_PAD_XPOS,
PROP_PAD_YPOS,
PROP_PAD_ALPHA
};
GType gst_videomixer_pad_get_type (void);
G_DEFINE_TYPE (GstVideoMixerPad, gst_videomixer_pad, GST_TYPE_PAD);
static void
gst_videomixer_pad_class_init (GstVideoMixerPadClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
gobject_class->set_property = gst_videomixer_pad_set_property;
gobject_class->get_property = gst_videomixer_pad_get_property;
g_object_class_install_property (gobject_class, PROP_PAD_ZORDER,
g_param_spec_uint ("zorder", "Z-Order", "Z Order of the picture",
0, 10000, DEFAULT_PAD_ZORDER,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PAD_XPOS,
g_param_spec_int ("xpos", "X Position", "X Position of the picture",
G_MININT, G_MAXINT, DEFAULT_PAD_XPOS,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PAD_YPOS,
g_param_spec_int ("ypos", "Y Position", "Y Position of the picture",
G_MININT, G_MAXINT, DEFAULT_PAD_YPOS,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PAD_ALPHA,
g_param_spec_double ("alpha", "Alpha", "Alpha of the picture", 0.0, 1.0,
DEFAULT_PAD_ALPHA,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
}
static void
gst_videomixer_pad_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstVideoMixerPad *pad = GST_VIDEO_MIXER_PAD (object);
switch (prop_id) {
case PROP_PAD_ZORDER:
g_value_set_uint (value, pad->zorder);
break;
case PROP_PAD_XPOS:
g_value_set_int (value, pad->xpos);
break;
case PROP_PAD_YPOS:
g_value_set_int (value, pad->ypos);
break;
case PROP_PAD_ALPHA:
g_value_set_double (value, pad->alpha);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_videomixer_pad_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstVideoMixerPad *pad = GST_VIDEO_MIXER_PAD (object);
GstVideoMixer *mix = GST_VIDEO_MIXER (gst_pad_get_parent (GST_PAD (pad)));
switch (prop_id) {
case PROP_PAD_ZORDER:
GST_VIDEO_MIXER_STATE_LOCK (mix);
pad->zorder = g_value_get_uint (value);
gst_videomixer_sort_pads (mix);
GST_VIDEO_MIXER_STATE_UNLOCK (mix);
break;
case PROP_PAD_XPOS:
pad->xpos = g_value_get_int (value);
break;
case PROP_PAD_YPOS:
pad->ypos = g_value_get_int (value);
break;
case PROP_PAD_ALPHA:
pad->alpha = g_value_get_double (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
gst_object_unref (mix);
}
static void
gst_videomixer_update_qos (GstVideoMixer * mix, gdouble proportion,
GstClockTimeDiff diff, GstClockTime timestamp)
{
GST_DEBUG_OBJECT (mix,
"Updating QoS: proportion %lf, diff %s%" GST_TIME_FORMAT ", timestamp %"
GST_TIME_FORMAT, proportion, (diff < 0) ? "-" : "",
GST_TIME_ARGS (ABS (diff)), GST_TIME_ARGS (timestamp));
GST_OBJECT_LOCK (mix);
mix->proportion = proportion;
if (G_LIKELY (timestamp != GST_CLOCK_TIME_NONE)) {
if (G_UNLIKELY (diff > 0))
mix->earliest_time =
timestamp + 2 * diff + gst_util_uint64_scale_int (GST_SECOND,
mix->fps_d, mix->fps_n);
else
mix->earliest_time = timestamp + diff;
} else {
mix->earliest_time = GST_CLOCK_TIME_NONE;
}
GST_OBJECT_UNLOCK (mix);
}
static void
gst_videomixer_reset_qos (GstVideoMixer * mix)
{
gst_videomixer_update_qos (mix, 0.5, 0, GST_CLOCK_TIME_NONE);
}
static void
gst_videomixer_read_qos (GstVideoMixer * mix, gdouble * proportion,
GstClockTime * time)
{
GST_OBJECT_LOCK (mix);
*proportion = mix->proportion;
*time = mix->earliest_time;
GST_OBJECT_UNLOCK (mix);
}
/* Perform qos calculations before processing the next frame. Returns TRUE if
* the frame should be processed, FALSE if the frame can be dropped entirely */
static gboolean
gst_videomixer_do_qos (GstVideoMixer * mix, GstClockTime timestamp)
{
GstClockTime qostime, earliest_time;
gdouble proportion;
/* no timestamp, can't do QoS => process frame */
if (G_UNLIKELY (!GST_CLOCK_TIME_IS_VALID (timestamp))) {
GST_LOG_OBJECT (mix, "invalid timestamp, can't do QoS, process frame");
return TRUE;
}
/* get latest QoS observation values */
gst_videomixer_read_qos (mix, &proportion, &earliest_time);
/* skip qos if we have no observation (yet) => process frame */
if (G_UNLIKELY (!GST_CLOCK_TIME_IS_VALID (earliest_time))) {
GST_LOG_OBJECT (mix, "no observation yet, process frame");
return TRUE;
}
/* qos is done on running time */
qostime =
gst_segment_to_running_time (&mix->segment, GST_FORMAT_TIME, timestamp);
/* see how our next timestamp relates to the latest qos timestamp */
GST_LOG_OBJECT (mix, "qostime %" GST_TIME_FORMAT ", earliest %"
GST_TIME_FORMAT, GST_TIME_ARGS (qostime), GST_TIME_ARGS (earliest_time));
if (qostime != GST_CLOCK_TIME_NONE && qostime <= earliest_time) {
GST_DEBUG_OBJECT (mix, "we are late, drop frame");
return FALSE;
}
GST_LOG_OBJECT (mix, "process frame");
return TRUE;
}
static void
gst_videomixer_set_master_geometry (GstVideoMixer * mix)
{
GSList *walk;
gint width = 0, height = 0, fps_n = 0, fps_d = 0, par_n = 0, par_d = 0;
GstVideoMixerPad *master = NULL;
walk = mix->sinkpads;
while (walk) {
GstVideoMixerPad *mixpad = GST_VIDEO_MIXER_PAD (walk->data);
walk = g_slist_next (walk);
/* Biggest input geometry will be our output geometry */
width = MAX (width, mixpad->in_width);
height = MAX (height, mixpad->in_height);
/* If mix framerate < mixpad framerate, using fractions */
GST_DEBUG_OBJECT (mixpad, "comparing framerate %d/%d to mixpad's %d/%d",
fps_n, fps_d, mixpad->fps_n, mixpad->fps_d);
if ((!fps_n && !fps_d) ||
((gint64) fps_n * mixpad->fps_d < (gint64) mixpad->fps_n * fps_d)) {
fps_n = mixpad->fps_n;
fps_d = mixpad->fps_d;
par_n = mixpad->par_n;
par_d = mixpad->par_d;
GST_DEBUG_OBJECT (mixpad, "becomes the master pad");
master = mixpad;
}
}
/* set results */
if (mix->master != master || mix->in_width != width
|| mix->in_height != height || mix->fps_n != fps_n
|| mix->fps_d != fps_d || mix->par_n != par_n || mix->par_d != par_d) {
mix->setcaps = TRUE;
mix->sendseg = TRUE;
gst_videomixer_reset_qos (mix);
mix->master = master;
mix->in_width = width;
mix->in_height = height;
mix->fps_n = fps_n;
mix->fps_d = fps_d;
mix->par_n = par_n;
mix->par_d = par_d;
}
}
static gboolean
gst_videomixer_pad_sink_setcaps (GstPad * pad, GstCaps * vscaps)
{
GstVideoMixer *mix;
GstVideoMixerPad *mixpad;
GstStructure *structure;
gint in_width, in_height;
gboolean ret = FALSE;
const GValue *framerate, *par;
GST_INFO_OBJECT (pad, "Setting caps %" GST_PTR_FORMAT, vscaps);
mix = GST_VIDEO_MIXER (gst_pad_get_parent (pad));
mixpad = GST_VIDEO_MIXER_PAD (pad);
if (!mixpad)
goto beach;
structure = gst_caps_get_structure (vscaps, 0);
if (!gst_structure_get_int (structure, "width", &in_width)
|| !gst_structure_get_int (structure, "height", &in_height)
|| (framerate = gst_structure_get_value (structure, "framerate")) == NULL)
goto beach;
par = gst_structure_get_value (structure, "pixel-aspect-ratio");
GST_VIDEO_MIXER_STATE_LOCK (mix);
mixpad->fps_n = gst_value_get_fraction_numerator (framerate);
mixpad->fps_d = gst_value_get_fraction_denominator (framerate);
if (par) {
mixpad->par_n = gst_value_get_fraction_numerator (par);
mixpad->par_d = gst_value_get_fraction_denominator (par);
} else {
mixpad->par_n = mixpad->par_d = 1;
}
mixpad->in_width = in_width;
mixpad->in_height = in_height;
gst_videomixer_set_master_geometry (mix);
GST_VIDEO_MIXER_STATE_UNLOCK (mix);
ret = TRUE;
beach:
gst_object_unref (mix);
return ret;
}
/*
* We accept the caps if it has the same format as other sink pads in
* the element.
*/
static gboolean
gst_videomixer_pad_sink_acceptcaps (GstPad * pad, GstCaps * vscaps)
{
gboolean ret;
GstVideoMixer *mix;
GstCaps *acceptedCaps;
mix = GST_VIDEO_MIXER (gst_pad_get_parent (pad));
GST_DEBUG_OBJECT (pad, "%" GST_PTR_FORMAT, vscaps);
GST_VIDEO_MIXER_STATE_LOCK (mix);
if (mix->master) {
acceptedCaps = gst_pad_get_fixed_caps_func (GST_PAD (mix->master));
acceptedCaps = gst_caps_make_writable (acceptedCaps);
GST_LOG_OBJECT (pad, "master's caps %" GST_PTR_FORMAT, acceptedCaps);
if (GST_CAPS_IS_SIMPLE (acceptedCaps)) {
GstStructure *s;
s = gst_caps_get_structure (acceptedCaps, 0);
gst_structure_set (s, "width", GST_TYPE_INT_RANGE, 1, G_MAXINT,
"height", GST_TYPE_INT_RANGE, 1, G_MAXINT,
"framerate", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT, 1, NULL);
if (!gst_structure_has_field (s, "pixel-aspect-ratio"))
gst_structure_set (s, "pixel-aspect-ratio", GST_TYPE_FRACTION, 1, 1,
NULL);
}
} else {
acceptedCaps = gst_pad_get_fixed_caps_func (pad);
}
GST_INFO_OBJECT (pad, "vscaps: %" GST_PTR_FORMAT, vscaps);
GST_INFO_OBJECT (pad, "acceptedCaps: %" GST_PTR_FORMAT, acceptedCaps);
ret = gst_caps_can_intersect (vscaps, acceptedCaps);
GST_INFO_OBJECT (pad, "%saccepted caps %" GST_PTR_FORMAT, (ret ? "" : "not "),
vscaps);
gst_caps_unref (acceptedCaps);
GST_VIDEO_MIXER_STATE_UNLOCK (mix);
gst_object_unref (mix);
return ret;
}
static void
gst_videomixer_pad_init (GstVideoMixerPad * mixerpad)
{
/* setup some pad functions */
gst_pad_set_setcaps_function (GST_PAD (mixerpad),
gst_videomixer_pad_sink_setcaps);
gst_pad_set_acceptcaps_function (GST_PAD (mixerpad),
GST_DEBUG_FUNCPTR (gst_videomixer_pad_sink_acceptcaps));
mixerpad->zorder = DEFAULT_PAD_ZORDER;
mixerpad->xpos = DEFAULT_PAD_XPOS;
mixerpad->ypos = DEFAULT_PAD_YPOS;
mixerpad->alpha = DEFAULT_PAD_ALPHA;
}
/* VideoMixer signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
#define DEFAULT_BACKGROUND VIDEO_MIXER_BACKGROUND_CHECKER
enum
{
PROP_0,
PROP_BACKGROUND
};
#define GST_TYPE_VIDEO_MIXER_BACKGROUND (gst_video_mixer_background_get_type())
static GType
gst_video_mixer_background_get_type (void)
{
static GType video_mixer_background_type = 0;
static const GEnumValue video_mixer_background[] = {
{VIDEO_MIXER_BACKGROUND_CHECKER, "Checker pattern", "checker"},
{VIDEO_MIXER_BACKGROUND_BLACK, "Black", "black"},
{VIDEO_MIXER_BACKGROUND_WHITE, "White", "white"},
{0, NULL, NULL},
};
if (!video_mixer_background_type) {
video_mixer_background_type =
g_enum_register_static ("GstVideoMixerBackground",
video_mixer_background);
}
return video_mixer_background_type;
}
static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("AYUV") ";" GST_VIDEO_CAPS_BGRA ";"
GST_VIDEO_CAPS_ARGB ";" GST_VIDEO_CAPS_RGBA ";" GST_VIDEO_CAPS_ABGR ";"
GST_VIDEO_CAPS_YUV ("Y444") ";" GST_VIDEO_CAPS_YUV ("Y42B") ";"
GST_VIDEO_CAPS_YUV ("YUY2") ";" GST_VIDEO_CAPS_YUV ("UYVY") ";"
GST_VIDEO_CAPS_YUV ("YVYU") ";"
GST_VIDEO_CAPS_YUV ("I420") ";" GST_VIDEO_CAPS_YUV ("YV12") ";"
GST_VIDEO_CAPS_YUV ("Y41B") ";" GST_VIDEO_CAPS_RGB ";"
GST_VIDEO_CAPS_BGR ";" GST_VIDEO_CAPS_xRGB ";" GST_VIDEO_CAPS_xBGR ";"
GST_VIDEO_CAPS_RGBx ";" GST_VIDEO_CAPS_BGRx)
);
static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink_%d",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("AYUV") ";" GST_VIDEO_CAPS_BGRA ";"
GST_VIDEO_CAPS_ARGB ";" GST_VIDEO_CAPS_RGBA ";" GST_VIDEO_CAPS_ABGR ";"
GST_VIDEO_CAPS_YUV ("Y444") ";" GST_VIDEO_CAPS_YUV ("Y42B") ";"
GST_VIDEO_CAPS_YUV ("YUY2") ";" GST_VIDEO_CAPS_YUV ("UYVY") ";"
GST_VIDEO_CAPS_YUV ("YVYU") ";"
GST_VIDEO_CAPS_YUV ("I420") ";" GST_VIDEO_CAPS_YUV ("YV12") ";"
GST_VIDEO_CAPS_YUV ("Y41B") ";" GST_VIDEO_CAPS_RGB ";"
GST_VIDEO_CAPS_BGR ";" GST_VIDEO_CAPS_xRGB ";" GST_VIDEO_CAPS_xBGR ";"
GST_VIDEO_CAPS_RGBx ";" GST_VIDEO_CAPS_BGRx)
);
static void gst_videomixer_finalize (GObject * object);
static GstCaps *gst_videomixer_getcaps (GstPad * pad);
static gboolean gst_videomixer_setcaps (GstPad * pad, GstCaps * caps);
static gboolean gst_videomixer_query (GstPad * pad, GstQuery * query);
static GstFlowReturn gst_videomixer_collected (GstCollectPads * pads,
GstVideoMixer * mix);
static GstPad *gst_videomixer_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * name);
static void gst_videomixer_release_pad (GstElement * element, GstPad * pad);
static void gst_videomixer_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_videomixer_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstStateChangeReturn gst_videomixer_change_state (GstElement * element,
GstStateChange transition);
/*static guint gst_videomixer_signals[LAST_SIGNAL] = { 0 }; */
static void gst_videomixer_child_proxy_init (gpointer g_iface,
gpointer iface_data);
static void _do_init (GType object_type);
GST_BOILERPLATE_FULL (GstVideoMixer, gst_videomixer, GstElement,
GST_TYPE_ELEMENT, _do_init);
static void
_do_init (GType object_type)
{
static const GInterfaceInfo child_proxy_info = {
(GInterfaceInitFunc) gst_videomixer_child_proxy_init,
NULL,
NULL
};
g_type_add_interface_static (object_type, GST_TYPE_CHILD_PROXY,
&child_proxy_info);
GST_INFO ("GstChildProxy interface registered");
}
static GstObject *
gst_videomixer_child_proxy_get_child_by_index (GstChildProxy * child_proxy,
guint index)
{
GstVideoMixer *mix = GST_VIDEO_MIXER (child_proxy);
GstObject *obj;
GST_VIDEO_MIXER_STATE_LOCK (mix);
if ((obj = g_slist_nth_data (mix->sinkpads, index)))
gst_object_ref (obj);
GST_VIDEO_MIXER_STATE_UNLOCK (mix);
return obj;
}
static guint
gst_videomixer_child_proxy_get_children_count (GstChildProxy * child_proxy)
{
guint count = 0;
GstVideoMixer *mix = GST_VIDEO_MIXER (child_proxy);
GST_VIDEO_MIXER_STATE_LOCK (mix);
count = mix->numpads;
GST_VIDEO_MIXER_STATE_UNLOCK (mix);
GST_INFO_OBJECT (mix, "Children Count: %d", count);
return count;
}
static void
gst_videomixer_child_proxy_init (gpointer g_iface, gpointer iface_data)
{
GstChildProxyInterface *iface = g_iface;
GST_INFO ("intializing child proxy interface");
iface->get_child_by_index = gst_videomixer_child_proxy_get_child_by_index;
iface->get_children_count = gst_videomixer_child_proxy_get_children_count;
}
static void
gst_videomixer_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_factory));
gst_element_class_set_details_simple (element_class, "Video mixer",
"Filter/Editor/Video",
"Mix multiple video streams", "Wim Taymans <wim@fluendo.com>");
}
static void
gst_videomixer_class_init (GstVideoMixerClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstElementClass *gstelement_class = (GstElementClass *) klass;
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_videomixer_finalize);
gobject_class->get_property = gst_videomixer_get_property;
gobject_class->set_property = gst_videomixer_set_property;
g_object_class_install_property (gobject_class, PROP_BACKGROUND,
g_param_spec_enum ("background", "Background", "Background type",
GST_TYPE_VIDEO_MIXER_BACKGROUND,
DEFAULT_BACKGROUND, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gstelement_class->request_new_pad =
GST_DEBUG_FUNCPTR (gst_videomixer_request_new_pad);
gstelement_class->release_pad =
GST_DEBUG_FUNCPTR (gst_videomixer_release_pad);
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_videomixer_change_state);
/* Register the pad class */
(void) (GST_TYPE_VIDEO_MIXER_PAD);
/* Register the background enum */
(void) (GST_TYPE_VIDEO_MIXER_BACKGROUND);
}
static void
gst_videomixer_collect_free (GstVideoMixerCollect * mixcol)
{
if (mixcol->buffer) {
gst_buffer_unref (mixcol->buffer);
mixcol->buffer = NULL;
}
}
static void
gst_videomixer_reset (GstVideoMixer * mix)
{
GSList *walk;
mix->in_width = 0;
mix->in_height = 0;
mix->out_width = 0;
mix->out_height = 0;
mix->fps_n = mix->fps_d = 0;
mix->par_n = mix->par_d = 1;
mix->setcaps = FALSE;
mix->sendseg = FALSE;
mix->segment_position = 0;
gst_segment_init (&mix->segment, GST_FORMAT_TIME);
gst_videomixer_reset_qos (mix);
mix->fmt = GST_VIDEO_FORMAT_UNKNOWN;
mix->last_ts = 0;
mix->last_duration = -1;
/* clean up collect data */
walk = mix->collect->data;
while (walk) {
GstVideoMixerCollect *data = (GstVideoMixerCollect *) walk->data;
gst_videomixer_collect_free (data);
walk = g_slist_next (walk);
}
mix->next_sinkpad = 0;
mix->flush_stop_pending = FALSE;
}
static void
gst_videomixer_init (GstVideoMixer * mix, GstVideoMixerClass * g_class)
{
GstElementClass *klass = GST_ELEMENT_GET_CLASS (mix);
mix->srcpad =
gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
"src"), "src");
gst_pad_set_getcaps_function (GST_PAD (mix->srcpad),
GST_DEBUG_FUNCPTR (gst_videomixer_getcaps));
gst_pad_set_setcaps_function (GST_PAD (mix->srcpad),
GST_DEBUG_FUNCPTR (gst_videomixer_setcaps));
gst_pad_set_query_function (GST_PAD (mix->srcpad),
GST_DEBUG_FUNCPTR (gst_videomixer_query));
gst_pad_set_event_function (GST_PAD (mix->srcpad),
GST_DEBUG_FUNCPTR (gst_videomixer_src_event));
gst_element_add_pad (GST_ELEMENT (mix), mix->srcpad);
mix->collect = gst_collect_pads_new ();
mix->background = DEFAULT_BACKGROUND;
gst_collect_pads_set_function (mix->collect,
(GstCollectPadsFunction) GST_DEBUG_FUNCPTR (gst_videomixer_collected),
mix);
mix->state_lock = g_mutex_new ();
/* initialize variables */
gst_videomixer_reset (mix);
}
static void
gst_videomixer_finalize (GObject * object)
{
GstVideoMixer *mix = GST_VIDEO_MIXER (object);
gst_object_unref (mix->collect);
g_mutex_free (mix->state_lock);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_videomixer_query_duration (GstVideoMixer * mix, GstQuery * query)
{
gint64 max;
gboolean res;
GstFormat format;
GstIterator *it;
gboolean done;
/* parse format */
gst_query_parse_duration (query, &format, NULL);
max = -1;
res = TRUE;
done = FALSE;
/* Take maximum of all durations */
it = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (mix));
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 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;
}
gst_object_unref (pad);
break;
}
case GST_ITERATOR_RESYNC:
max = -1;
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 (mix, "Total duration in format %s: %"
GST_TIME_FORMAT, gst_format_get_name (format), GST_TIME_ARGS (max));
gst_query_set_duration (query, format, max);
}
return res;
}
static gboolean
gst_videomixer_query_latency (GstVideoMixer * mix, 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 (mix));
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 (mix, "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_videomixer_query (GstPad * pad, GstQuery * query)
{
GstVideoMixer *mix = GST_VIDEO_MIXER (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, mix->last_ts);
res = TRUE;
break;
default:
break;
}
break;
}
case GST_QUERY_DURATION:
res = gst_videomixer_query_duration (mix, query);
break;
case GST_QUERY_LATENCY:
res = gst_videomixer_query_latency (mix, query);
break;
default:
/* FIXME, needs a custom query handler because we have multiple
* sinkpads, send to the master pad until then */
res = gst_pad_query (GST_PAD_CAST (mix->master), query);
break;
}
gst_object_unref (mix);
return res;
}
static GstCaps *
gst_videomixer_getcaps (GstPad * pad)
{
GstVideoMixer *mix = GST_VIDEO_MIXER (gst_pad_get_parent (pad));
GstCaps *caps;
GstStructure *structure;
int numCaps;
if (mix->master) {
caps =
gst_caps_copy (gst_pad_get_pad_template_caps (GST_PAD (mix->master)));
} else {
caps = gst_caps_copy (gst_pad_get_pad_template_caps (mix->srcpad));
}
numCaps = gst_caps_get_size (caps) - 1;
for (; numCaps >= 0; numCaps--) {
structure = gst_caps_get_structure (caps, numCaps);
if (mix->out_width != 0) {
gst_structure_set (structure, "width", G_TYPE_INT, mix->out_width, NULL);
}
if (mix->out_height != 0) {
gst_structure_set (structure, "height", G_TYPE_INT, mix->out_height,
NULL);
}
if (mix->fps_d != 0) {
gst_structure_set (structure,
"framerate", GST_TYPE_FRACTION, mix->fps_n, mix->fps_d, NULL);
}
}
gst_object_unref (mix);
return caps;
}
static gboolean
gst_videomixer_setcaps (GstPad * pad, GstCaps * caps)
{
GstVideoMixer *mixer = GST_VIDEO_MIXER (gst_pad_get_parent_element (pad));
gboolean ret = FALSE;
GST_INFO_OBJECT (mixer, "set src caps: %" GST_PTR_FORMAT, caps);
mixer->blend = NULL;
mixer->fill_checker = NULL;
mixer->fill_color = NULL;
if (!gst_video_format_parse_caps (caps, &mixer->fmt, NULL, NULL))
goto done;
switch (mixer->fmt) {
case GST_VIDEO_FORMAT_AYUV:
mixer->blend = gst_video_mixer_blend_ayuv;
mixer->fill_checker = gst_video_mixer_fill_checker_ayuv;
mixer->fill_color = gst_video_mixer_fill_color_ayuv;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_ARGB:
mixer->blend = gst_video_mixer_blend_argb;
mixer->fill_checker = gst_video_mixer_fill_checker_argb;
mixer->fill_color = gst_video_mixer_fill_color_argb;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_BGRA:
mixer->blend = gst_video_mixer_blend_bgra;
mixer->fill_checker = gst_video_mixer_fill_checker_bgra;
mixer->fill_color = gst_video_mixer_fill_color_bgra;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_ABGR:
mixer->blend = gst_video_mixer_blend_abgr;
mixer->fill_checker = gst_video_mixer_fill_checker_abgr;
mixer->fill_color = gst_video_mixer_fill_color_abgr;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_RGBA:
mixer->blend = gst_video_mixer_blend_rgba;
mixer->fill_checker = gst_video_mixer_fill_checker_rgba;
mixer->fill_color = gst_video_mixer_fill_color_rgba;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_Y444:
mixer->blend = gst_video_mixer_blend_y444;
mixer->fill_checker = gst_video_mixer_fill_checker_y444;
mixer->fill_color = gst_video_mixer_fill_color_y444;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_Y42B:
mixer->blend = gst_video_mixer_blend_y42b;
mixer->fill_checker = gst_video_mixer_fill_checker_y42b;
mixer->fill_color = gst_video_mixer_fill_color_y42b;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_YUY2:
mixer->blend = gst_video_mixer_blend_yuy2;
mixer->fill_checker = gst_video_mixer_fill_checker_yuy2;
mixer->fill_color = gst_video_mixer_fill_color_yuy2;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_UYVY:
mixer->blend = gst_video_mixer_blend_uyvy;
mixer->fill_checker = gst_video_mixer_fill_checker_uyvy;
mixer->fill_color = gst_video_mixer_fill_color_uyvy;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_YVYU:
mixer->blend = gst_video_mixer_blend_yvyu;
mixer->fill_checker = gst_video_mixer_fill_checker_yvyu;
mixer->fill_color = gst_video_mixer_fill_color_yvyu;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_I420:
mixer->blend = gst_video_mixer_blend_i420;
mixer->fill_checker = gst_video_mixer_fill_checker_i420;
mixer->fill_color = gst_video_mixer_fill_color_i420;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_YV12:
mixer->blend = gst_video_mixer_blend_yv12;
mixer->fill_checker = gst_video_mixer_fill_checker_yv12;
mixer->fill_color = gst_video_mixer_fill_color_yv12;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_Y41B:
mixer->blend = gst_video_mixer_blend_y41b;
mixer->fill_checker = gst_video_mixer_fill_checker_y41b;
mixer->fill_color = gst_video_mixer_fill_color_y41b;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_RGB:
mixer->blend = gst_video_mixer_blend_rgb;
mixer->fill_checker = gst_video_mixer_fill_checker_rgb;
mixer->fill_color = gst_video_mixer_fill_color_rgb;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_BGR:
mixer->blend = gst_video_mixer_blend_bgr;
mixer->fill_checker = gst_video_mixer_fill_checker_bgr;
mixer->fill_color = gst_video_mixer_fill_color_bgr;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_xRGB:
mixer->blend = gst_video_mixer_blend_xrgb;
mixer->fill_checker = gst_video_mixer_fill_checker_xrgb;
mixer->fill_color = gst_video_mixer_fill_color_xrgb;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_xBGR:
mixer->blend = gst_video_mixer_blend_xbgr;
mixer->fill_checker = gst_video_mixer_fill_checker_xbgr;
mixer->fill_color = gst_video_mixer_fill_color_xbgr;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_RGBx:
mixer->blend = gst_video_mixer_blend_rgbx;
mixer->fill_checker = gst_video_mixer_fill_checker_rgbx;
mixer->fill_color = gst_video_mixer_fill_color_rgbx;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_BGRx:
mixer->blend = gst_video_mixer_blend_bgrx;
mixer->fill_checker = gst_video_mixer_fill_checker_bgrx;
mixer->fill_color = gst_video_mixer_fill_color_bgrx;
ret = TRUE;
break;
default:
break;
}
done:
gst_object_unref (mixer);
return ret;
}
static GstPad *
gst_videomixer_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * req_name)
{
GstVideoMixer *mix = NULL;
GstVideoMixerPad *mixpad = NULL;
GstElementClass *klass = GST_ELEMENT_GET_CLASS (element);
g_return_val_if_fail (templ != NULL, NULL);
if (G_UNLIKELY (templ->direction != GST_PAD_SINK)) {
g_warning ("videomixer: request pad that is not a SINK pad");
return NULL;
}
g_return_val_if_fail (GST_IS_VIDEO_MIXER (element), NULL);
mix = GST_VIDEO_MIXER (element);
if (templ == gst_element_class_get_pad_template (klass, "sink_%d")) {
gint serial = 0;
gchar *name = NULL;
GstVideoMixerCollect *mixcol = NULL;
GST_VIDEO_MIXER_STATE_LOCK (mix);
if (req_name == NULL || strlen (req_name) < 6
|| !g_str_has_prefix (req_name, "sink_")) {
/* no name given when requesting the pad, use next available int */
serial = mix->next_sinkpad++;
} else {
/* parse serial number from requested padname */
serial = atoi (&req_name[5]);
if (serial >= mix->next_sinkpad)
mix->next_sinkpad = serial + 1;
}
/* create new pad with the name */
name = g_strdup_printf ("sink_%d", serial);
mixpad = g_object_new (GST_TYPE_VIDEO_MIXER_PAD, "name", name, "direction",
templ->direction, "template", templ, NULL);
g_free (name);
mixpad->zorder = mix->numpads;
mixpad->xpos = DEFAULT_PAD_XPOS;
mixpad->ypos = DEFAULT_PAD_YPOS;
mixpad->alpha = DEFAULT_PAD_ALPHA;
mixcol = (GstVideoMixerCollect *)
gst_collect_pads_add_pad (mix->collect, GST_PAD (mixpad),
sizeof (GstVideoMixerCollect));
/* 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 */
mix->collect_event =
(GstPadEventFunction) GST_PAD_EVENTFUNC (GST_PAD (mixpad));
gst_pad_set_event_function (GST_PAD (mixpad),
GST_DEBUG_FUNCPTR (gst_videomixer_sink_event));
/* Keep track of each other */
mixcol->mixpad = mixpad;
mixpad->mixcol = mixcol;
/* Keep an internal list of mixpads for zordering */
mix->sinkpads = g_slist_append (mix->sinkpads, mixpad);
mix->numpads++;
GST_VIDEO_MIXER_STATE_UNLOCK (mix);
} else {
g_warning ("videomixer: this is not our template!");
return NULL;
}
/* add the pad to the element */
gst_element_add_pad (element, GST_PAD (mixpad));
gst_child_proxy_child_added (GST_OBJECT (mix), GST_OBJECT (mixpad));
return GST_PAD (mixpad);
}
static void
gst_videomixer_release_pad (GstElement * element, GstPad * pad)
{
GstVideoMixer *mix = NULL;
GstVideoMixerPad *mixpad;
mix = GST_VIDEO_MIXER (element);
GST_VIDEO_MIXER_STATE_LOCK (mix);
if (G_UNLIKELY (g_slist_find (mix->sinkpads, pad) == NULL)) {
g_warning ("Unknown pad %s", GST_PAD_NAME (pad));
goto error;
}
mixpad = GST_VIDEO_MIXER_PAD (pad);
mix->sinkpads = g_slist_remove (mix->sinkpads, pad);
gst_videomixer_collect_free (mixpad->mixcol);
gst_collect_pads_remove_pad (mix->collect, pad);
gst_child_proxy_child_removed (GST_OBJECT (mix), GST_OBJECT (mixpad));
/* determine possibly new geometry and master */
gst_videomixer_set_master_geometry (mix);
mix->numpads--;
GST_VIDEO_MIXER_STATE_UNLOCK (mix);
gst_element_remove_pad (element, pad);
return;
error:
GST_VIDEO_MIXER_STATE_UNLOCK (mix);
}
static int
pad_zorder_compare (const GstVideoMixerPad * pad1,
const GstVideoMixerPad * pad2)
{
return pad1->zorder - pad2->zorder;
}
static void
gst_videomixer_sort_pads (GstVideoMixer * mix)
{
mix->sinkpads = g_slist_sort (mix->sinkpads,
(GCompareFunc) pad_zorder_compare);
}
/* try to get a buffer on all pads. As long as the queued value is
* negative, we skip buffers */
static gboolean
gst_videomixer_fill_queues (GstVideoMixer * mix)
{
GSList *walk = NULL;
gboolean eos = TRUE;
g_return_val_if_fail (GST_IS_VIDEO_MIXER (mix), FALSE);
/* try to make sure we have a buffer from each usable pad first */
walk = mix->collect->data;
while (walk) {
GstCollectData *data = (GstCollectData *) walk->data;
GstVideoMixerCollect *mixcol = (GstVideoMixerCollect *) data;
GstVideoMixerPad *mixpad = mixcol->mixpad;
walk = g_slist_next (walk);
if (mixcol->buffer == NULL) {
GstBuffer *buf = NULL;
GST_LOG_OBJECT (mix, "we need a new buffer");
buf = gst_collect_pads_peek (mix->collect, data);
if (buf) {
guint64 duration;
mixcol->buffer = buf;
duration = GST_BUFFER_DURATION (mixcol->buffer);
GST_LOG_OBJECT (mix, "we have a buffer with duration %" GST_TIME_FORMAT
", queued %" GST_TIME_FORMAT, GST_TIME_ARGS (duration),
GST_TIME_ARGS (mixpad->queued));
/* no duration on the buffer, use the framerate */
if (!GST_CLOCK_TIME_IS_VALID (duration)) {
if (mixpad->fps_n == 0) {
duration = GST_CLOCK_TIME_NONE;
} else {
duration =
gst_util_uint64_scale_int (GST_SECOND, mixpad->fps_d,
mixpad->fps_n);
}
}
if (GST_CLOCK_TIME_IS_VALID (duration))
mixpad->queued += duration;
else if (!mixpad->queued)
mixpad->queued = GST_CLOCK_TIME_NONE;
GST_LOG_OBJECT (mix, "now queued: %" GST_TIME_FORMAT,
GST_TIME_ARGS (mixpad->queued));
} else {
GST_LOG_OBJECT (mix, "pop returned a NULL buffer");
}
}
if (mix->sendseg && (mixpad == mix->master)) {
GstEvent *event;
gint64 stop, start;
GstSegment *segment = &data->segment;
/* 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.
*/
GST_INFO_OBJECT (mix, "_sending play segment");
start = segment->accum;
/* get the duration of the segment if we can and add it to the accumulated
* time on the segment. */
if (segment->stop != -1 && segment->start != -1)
stop = start + (segment->stop - segment->start);
else
stop = -1;
gst_segment_set_newsegment (&mix->segment, FALSE, segment->rate,
segment->format, start, stop, start + mix->segment_position);
event =
gst_event_new_new_segment_full (FALSE, segment->rate, 1.0,
segment->format, start, stop, start + mix->segment_position);
gst_pad_push_event (mix->srcpad, event);
mix->sendseg = FALSE;
}
if (mixcol->buffer != NULL && GST_CLOCK_TIME_IS_VALID (mixpad->queued)) {
/* got a buffer somewhere so we're not eos */
eos = FALSE;
}
}
return eos;
}
/* blend all buffers present on the pads */
static void
gst_videomixer_blend_buffers (GstVideoMixer * mix, GstBuffer * outbuf)
{
GSList *walk;
walk = mix->sinkpads;
while (walk) { /* We walk with this list because it's ordered */
GstVideoMixerPad *pad = GST_VIDEO_MIXER_PAD (walk->data);
GstVideoMixerCollect *mixcol = pad->mixcol;
walk = g_slist_next (walk);
if (mixcol->buffer != NULL) {
GstClockTime timestamp;
gint64 stream_time;
GstSegment *seg;
seg = &mixcol->collect.segment;
timestamp = GST_BUFFER_TIMESTAMP (mixcol->buffer);
stream_time =
gst_segment_to_stream_time (seg, GST_FORMAT_TIME, timestamp);
/* sync object properties on stream time */
if (GST_CLOCK_TIME_IS_VALID (stream_time))
gst_object_sync_values (G_OBJECT (pad), stream_time);
mix->blend (GST_BUFFER_DATA (mixcol->buffer),
pad->xpos, pad->ypos, pad->in_width, pad->in_height, pad->alpha,
GST_BUFFER_DATA (outbuf), mix->out_width, mix->out_height);
}
}
}
/* remove buffers from the queue that were expired in the
* interval of the master, we also prepare the queued value
* in the pad so that we can skip and fill buffers later on */
static void
gst_videomixer_update_queues (GstVideoMixer * mix)
{
GSList *walk;
gint64 interval;
interval = mix->master->queued;
if (interval <= 0) {
if (mix->fps_n == 0) {
interval = G_MAXINT64;
} else {
interval = gst_util_uint64_scale_int (GST_SECOND, mix->fps_d, mix->fps_n);
}
GST_LOG_OBJECT (mix, "set interval to %" G_GINT64_FORMAT " nanoseconds",
interval);
}
walk = mix->sinkpads;
while (walk) {
GstVideoMixerPad *pad = GST_VIDEO_MIXER_PAD (walk->data);
GstVideoMixerCollect *mixcol = pad->mixcol;
walk = g_slist_next (walk);
if (mixcol->buffer != NULL) {
pad->queued -= interval;
GST_LOG_OBJECT (pad, "queued now %" G_GINT64_FORMAT, pad->queued);
if (pad->queued <= 0) {
GstBuffer *buffer =
gst_collect_pads_pop (mix->collect, &mixcol->collect);
GST_LOG_OBJECT (pad, "unreffing buffer");
if (buffer)
gst_buffer_unref (buffer);
else
GST_WARNING_OBJECT (pad,
"Buffer was removed by GstCollectPads in the meantime");
gst_buffer_unref (mixcol->buffer);
mixcol->buffer = NULL;
}
}
}
}
static GstFlowReturn
gst_videomixer_collected (GstCollectPads * pads, GstVideoMixer * mix)
{
GstFlowReturn ret = GST_FLOW_OK;
GstBuffer *outbuf = NULL;
size_t outsize = 0;
gboolean eos = FALSE;
GstClockTime timestamp = GST_CLOCK_TIME_NONE;
GstClockTime duration = GST_CLOCK_TIME_NONE;
g_return_val_if_fail (GST_IS_VIDEO_MIXER (mix), GST_FLOW_ERROR);
/* This must be set, otherwise we have no caps */
if (G_UNLIKELY (mix->in_width == 0))
return GST_FLOW_NOT_NEGOTIATED;
if (g_atomic_int_compare_and_exchange (&mix->flush_stop_pending, TRUE, FALSE)) {
GST_DEBUG_OBJECT (mix, "pending flush stop");
gst_pad_push_event (mix->srcpad, gst_event_new_flush_stop ());
}
GST_LOG_OBJECT (mix, "all pads are collected");
GST_VIDEO_MIXER_STATE_LOCK (mix);
eos = gst_videomixer_fill_queues (mix);
if (eos) {
/* Push EOS downstream */
GST_LOG_OBJECT (mix, "all our sinkpads are EOS, pushing downstream");
gst_pad_push_event (mix->srcpad, gst_event_new_eos ());
ret = GST_FLOW_WRONG_STATE;
goto error;
}
/* If geometry has changed we need to set new caps on the buffer */
if (mix->in_width != mix->out_width || mix->in_height != mix->out_height
|| mix->setcaps) {
GstCaps *newcaps = NULL;
newcaps = gst_caps_make_writable
(gst_pad_get_negotiated_caps (GST_PAD (mix->master)));
gst_caps_set_simple (newcaps,
"width", G_TYPE_INT, mix->in_width,
"height", G_TYPE_INT, mix->in_height,
"pixel-aspect-ratio", GST_TYPE_FRACTION, mix->par_n, mix->par_d, NULL);
mix->out_width = mix->in_width;
mix->out_height = mix->in_height;
mix->setcaps = FALSE;
/* Calculating out buffer size from input size */
gst_pad_set_caps (mix->srcpad, newcaps);
gst_caps_unref (newcaps);
}
/* Get timestamp & duration */
if (mix->master->mixcol->buffer != NULL) {
GstClockTime in_ts;
GstSegment *seg;
GstVideoMixerCollect *mixcol = mix->master->mixcol;
seg = &mixcol->collect.segment;
in_ts = GST_BUFFER_TIMESTAMP (mixcol->buffer);
timestamp = gst_segment_to_running_time (seg, GST_FORMAT_TIME, in_ts);
duration = GST_BUFFER_DURATION (mixcol->buffer);
mix->last_ts = timestamp;
mix->last_duration = duration;
} else {
timestamp = mix->last_ts;
duration = mix->last_duration;
}
if (GST_CLOCK_TIME_IS_VALID (duration))
mix->last_ts += duration;
if (!gst_videomixer_do_qos (mix, timestamp)) {
gst_videomixer_update_queues (mix);
GST_VIDEO_MIXER_STATE_UNLOCK (mix);
ret = GST_FLOW_OK;
goto beach;
}
/* allocate an output buffer */
outsize =
gst_video_format_get_size (mix->fmt, mix->out_width, mix->out_height);
ret =
gst_pad_alloc_buffer_and_set_caps (mix->srcpad, GST_BUFFER_OFFSET_NONE,
outsize, GST_PAD_CAPS (mix->srcpad), &outbuf);
/* This must be set at this point, otherwise we have no src caps */
g_assert (mix->blend != NULL);
if (ret != GST_FLOW_OK) {
goto error;
}
GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
GST_BUFFER_DURATION (outbuf) = duration;
switch (mix->background) {
case VIDEO_MIXER_BACKGROUND_CHECKER:
mix->fill_checker (GST_BUFFER_DATA (outbuf), mix->out_width,
mix->out_height);
break;
case VIDEO_MIXER_BACKGROUND_BLACK:
mix->fill_color (GST_BUFFER_DATA (outbuf), mix->out_width,
mix->out_height, 16, 128, 128);
break;
case VIDEO_MIXER_BACKGROUND_WHITE:
mix->fill_color (GST_BUFFER_DATA (outbuf), mix->out_width,
mix->out_height, 240, 128, 128);
break;
}
gst_videomixer_blend_buffers (mix, outbuf);
gst_videomixer_update_queues (mix);
GST_VIDEO_MIXER_STATE_UNLOCK (mix);
ret = gst_pad_push (mix->srcpad, outbuf);
beach:
return ret;
/* ERRORS */
error:
{
if (outbuf)
gst_buffer_unref (outbuf);
GST_VIDEO_MIXER_STATE_UNLOCK (mix);
goto beach;
}
}
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_WARNING_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 (GstVideoMixer * mix, GstEvent * event)
{
GstIterator *it;
GValue vret = { 0 };
GST_LOG_OBJECT (mix, "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 (mix));
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_videomixer_src_event (GstPad * pad, GstEvent * event)
{
GstVideoMixer *mix = GST_VIDEO_MIXER (gst_pad_get_parent (pad));
gboolean result;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_QOS:{
GstClockTimeDiff diff;
GstClockTime timestamp;
gdouble proportion;
gst_event_parse_qos (event, &proportion, &diff, &timestamp);
gst_videomixer_update_qos (mix, proportion, diff, timestamp);
gst_event_unref (event);
/* TODO: The QoS event should be transformed and send upstream */
result = TRUE;
break;
}
case GST_EVENT_SEEK:
{
GstSeekFlags flags;
GstSeekType curtype;
gint64 cur;
/* parse the seek parameters */
gst_event_parse_seek (event, NULL, 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 (mix->collect, TRUE);
/* flushing seek, start flush downstream, the flush will be done
* when all pads received a FLUSH_STOP. */
gst_pad_push_event (mix->srcpad, gst_event_new_flush_start ());
}
/* now wait for the collected to be finished and mark a new
* segment */
GST_OBJECT_LOCK (mix->collect);
if (curtype == GST_SEEK_TYPE_SET)
mix->segment_position = cur;
else
mix->segment_position = 0;
mix->sendseg = TRUE;
if (flags & GST_SEEK_FLAG_FLUSH) {
gst_collect_pads_set_flushing (mix->collect, FALSE);
/* we can't send FLUSH_STOP here since upstream could start pushing data
* after we unlock mix->collect.
* We set flush_stop_pending to TRUE instead and send FLUSH_STOP after
* forwarding the seek upstream or from gst_videomixer_collected,
* whichever happens first.
*/
mix->flush_stop_pending = TRUE;
}
GST_OBJECT_UNLOCK (mix->collect);
gst_videomixer_reset_qos (mix);
result = forward_event (mix, event);
if (g_atomic_int_compare_and_exchange (&mix->flush_stop_pending,
TRUE, FALSE)) {
GST_DEBUG_OBJECT (mix, "pending flush stop");
gst_pad_push_event (mix->srcpad, gst_event_new_flush_stop ());
}
break;
}
case GST_EVENT_NAVIGATION:
/* navigation is rather pointless. */
result = FALSE;
break;
default:
/* just forward the rest for now */
result = forward_event (mix, event);
break;
}
gst_object_unref (mix);
return result;
}
static gboolean
gst_videomixer_sink_event (GstPad * pad, GstEvent * event)
{
GstVideoMixerPad *vpad = GST_VIDEO_MIXER_PAD (pad);
GstVideoMixer *videomixer = GST_VIDEO_MIXER (gst_pad_get_parent (pad));
gboolean ret;
GST_DEBUG_OBJECT (pad, "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_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!).
*/
videomixer->sendseg = TRUE;
videomixer->flush_stop_pending = FALSE;
gst_videomixer_reset_qos (videomixer);
/* Reset pad state after FLUSH_STOP */
if (vpad->mixcol->buffer)
gst_buffer_unref (vpad->mixcol->buffer);
vpad->mixcol->buffer = NULL;
vpad->queued = 0;
break;
case GST_EVENT_NEWSEGMENT:
videomixer->sendseg = TRUE;
gst_videomixer_reset_qos (videomixer);
break;
default:
break;
}
/* now GstCollectPads can take care of the rest, e.g. EOS */
ret = videomixer->collect_event (pad, event);
gst_object_unref (videomixer);
return ret;
}
static void
gst_videomixer_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstVideoMixer *mix = GST_VIDEO_MIXER (object);
switch (prop_id) {
case PROP_BACKGROUND:
g_value_set_enum (value, mix->background);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_videomixer_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstVideoMixer *mix = GST_VIDEO_MIXER (object);
switch (prop_id) {
case PROP_BACKGROUND:
mix->background = g_value_get_enum (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstStateChangeReturn
gst_videomixer_change_state (GstElement * element, GstStateChange transition)
{
GstVideoMixer *mix;
GstStateChangeReturn ret;
g_return_val_if_fail (GST_IS_VIDEO_MIXER (element), GST_STATE_CHANGE_FAILURE);
mix = GST_VIDEO_MIXER (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
GST_LOG_OBJECT (mix, "starting collectpads");
gst_collect_pads_start (mix->collect);
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
GST_LOG_OBJECT (mix, "stopping collectpads");
gst_collect_pads_stop (mix->collect);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_videomixer_reset (mix);
break;
default:
break;
}
return ret;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (gst_videomixer_debug, "videomixer", 0,
"video mixer");
gst_video_mixer_init_blend ();
return gst_element_register (plugin, "videomixer", GST_RANK_PRIMARY,
GST_TYPE_VIDEO_MIXER);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"videomixer",
"Video mixer", plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME,
GST_PACKAGE_ORIGIN)
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