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gstreamer/sys/v4l/gstv4lmjpegsink.c
Ronald S. Bultje 0f124a569d Some interface implementations for video4linux/video4linux2 plugins: a Tuner interface, with which one can select inp... 
Original commit message from CVS:
Some interface implementations for video4linux/video4linux2 plugins:
* a Tuner interface, with which one can select inputs and stations. Audio
work is underway here, but unfinished.
* A Xoverlay interface with which one can do simple overlay. Similar to
the API of the v4l/Xv XFree86 extension. Widget implementation for
GTK-2.0 coming up in the sandbox.
* Colorbalance - for adapting colors (brightness, contrast, etc.) - pretty
basic and maybe somewhat overdesigned. But it'll do for now.

Apart from these interfaces, there's also a loadable library 'xwindowlistener'
that listenes to X for the movement of a window and the overlap of other
windows. This is partly copied from xawtv (and thus partly GPL :(), but it's
needed for the xoverlay interface implementation in the v4l/v4l2 elements.

Lastly, some small changes to remove redundant properties from the v4l/v4l2
elements since these can be done much simpler. Comments appreciated!
2003-10-10 12:47:41 +00:00

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/* G-Streamer hardware MJPEG video sink plugin
* Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <config.h>
#endif
#include <string.h>
#include "v4lmjpegsink_calls.h"
/* elementfactory information */
static GstElementDetails gst_v4lmjpegsink_details = {
"Video (video4linux/MJPEG) sink",
"Sink/Video",
"LGPL",
"Writes MJPEG-encoded frames to a zoran MJPEG/video4linux device",
VERSION,
"Ronald Bultje <rbultje@ronald.bitfreak.net>",
"(C) 2001",
};
/* v4lmjpegsink signals and args */
enum {
SIGNAL_FRAME_DISPLAYED,
SIGNAL_HAVE_SIZE,
LAST_SIGNAL
};
enum {
ARG_0,
ARG_NUMBUFS,
ARG_BUFSIZE,
ARG_X_OFFSET,
ARG_Y_OFFSET,
ARG_FRAMES_DISPLAYED,
ARG_FRAME_TIME,
};
/* init functions */
static void gst_v4lmjpegsink_class_init (GstV4lMjpegSinkClass *klass);
static void gst_v4lmjpegsink_init (GstV4lMjpegSink *v4lmjpegsink);
/* the chain of buffers */
static GstPadLinkReturn gst_v4lmjpegsink_sinkconnect (GstPad *pad,
GstCaps *vscapslist);
static void gst_v4lmjpegsink_chain (GstPad *pad,
GstData *_data);
/* get/set gst object functions */
static void gst_v4lmjpegsink_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gst_v4lmjpegsink_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static GstElementStateReturn gst_v4lmjpegsink_change_state (GstElement *element);
static void gst_v4lmjpegsink_set_clock (GstElement *element, GstClock *clock);
/* bufferpool functions */
static GstBuffer* gst_v4lmjpegsink_buffer_new (GstBufferPool *pool,
guint64 offset,
guint size,
gpointer user_data);
static GstCaps *capslist = NULL;
static GstPadTemplate *sink_template;
static GstElementClass *parent_class = NULL;
static guint gst_v4lmjpegsink_signals[LAST_SIGNAL] = { 0 };
GType
gst_v4lmjpegsink_get_type (void)
{
static GType v4lmjpegsink_type = 0;
if (!v4lmjpegsink_type) {
static const GTypeInfo v4lmjpegsink_info = {
sizeof(GstV4lMjpegSinkClass),
NULL,
NULL,
(GClassInitFunc)gst_v4lmjpegsink_class_init,
NULL,
NULL,
sizeof(GstV4lMjpegSink),
0,
(GInstanceInitFunc)gst_v4lmjpegsink_init,
};
v4lmjpegsink_type = g_type_register_static(GST_TYPE_V4LELEMENT, "GstV4lMjpegSink", &v4lmjpegsink_info, 0);
}
return v4lmjpegsink_type;
}
static void
gst_v4lmjpegsink_class_init (GstV4lMjpegSinkClass *klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
parent_class = g_type_class_ref (GST_TYPE_V4LELEMENT);
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_NUMBUFS,
g_param_spec_int("num_buffers","num_buffers","num_buffers",
G_MININT,G_MAXINT,0,G_PARAM_READWRITE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_BUFSIZE,
g_param_spec_int("buffer_size","buffer_size","buffer_size",
G_MININT,G_MAXINT,0,G_PARAM_READWRITE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_X_OFFSET,
g_param_spec_int("x_offset","x_offset","x_offset",
G_MININT,G_MAXINT,0,G_PARAM_WRITABLE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_Y_OFFSET,
g_param_spec_int("y_offset","y_offset","y_offset",
G_MININT,G_MAXINT,0,G_PARAM_WRITABLE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_FRAMES_DISPLAYED,
g_param_spec_int("frames_displayed","frames_displayed","frames_displayed",
G_MININT,G_MAXINT,0,G_PARAM_READABLE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_FRAME_TIME,
g_param_spec_int("frame_time","frame_time","frame_time",
G_MININT,G_MAXINT,0,G_PARAM_READABLE));
gobject_class->set_property = gst_v4lmjpegsink_set_property;
gobject_class->get_property = gst_v4lmjpegsink_get_property;
gst_v4lmjpegsink_signals[SIGNAL_FRAME_DISPLAYED] =
g_signal_new ("frame_displayed", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstV4lMjpegSinkClass, frame_displayed), NULL, NULL,
g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
gst_v4lmjpegsink_signals[SIGNAL_HAVE_SIZE] =
g_signal_new ("have_size", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstV4lMjpegSinkClass, have_size), NULL, NULL,
gst_marshal_VOID__INT_INT, G_TYPE_NONE, 2,
G_TYPE_UINT, G_TYPE_UINT);
gstelement_class->change_state = gst_v4lmjpegsink_change_state;
gstelement_class->set_clock = gst_v4lmjpegsink_set_clock;
}
static void
gst_v4lmjpegsink_init (GstV4lMjpegSink *v4lmjpegsink)
{
v4lmjpegsink->sinkpad = gst_pad_new_from_template (sink_template, "sink");
gst_element_add_pad (GST_ELEMENT (v4lmjpegsink), v4lmjpegsink->sinkpad);
gst_pad_set_chain_function (v4lmjpegsink->sinkpad, gst_v4lmjpegsink_chain);
gst_pad_set_link_function (v4lmjpegsink->sinkpad, gst_v4lmjpegsink_sinkconnect);
v4lmjpegsink->clock = NULL;
v4lmjpegsink->width = -1;
v4lmjpegsink->height = -1;
v4lmjpegsink->x_offset = -1;
v4lmjpegsink->y_offset = -1;
v4lmjpegsink->numbufs = 64;
v4lmjpegsink->bufsize = 256;
GST_FLAG_SET(v4lmjpegsink, GST_ELEMENT_THREAD_SUGGESTED);
v4lmjpegsink->bufferpool = gst_buffer_pool_new(
NULL,
NULL,
(GstBufferPoolBufferNewFunction)gst_v4lmjpegsink_buffer_new,
NULL,
NULL,
v4lmjpegsink);
}
static GstPadLinkReturn
gst_v4lmjpegsink_sinkconnect (GstPad *pad,
GstCaps *vscapslist)
{
GstV4lMjpegSink *v4lmjpegsink;
GstCaps *caps;
v4lmjpegsink = GST_V4LMJPEGSINK (gst_pad_get_parent (pad));
/* we are not going to act on variable caps */
if (!GST_CAPS_IS_FIXED (vscapslist) || !GST_V4L_IS_OPEN(GST_V4LELEMENT(v4lmjpegsink)))
return GST_PAD_LINK_DELAYED;
/* in case the buffers are active (which means that we already
* did capsnego before and didn't clean up), clean up anyways */
if (GST_V4L_IS_ACTIVE(GST_V4LELEMENT(v4lmjpegsink)))
if (!gst_v4lmjpegsink_playback_deinit(v4lmjpegsink))
return GST_PAD_LINK_REFUSED;
for (caps = vscapslist; caps != NULL; caps = vscapslist = vscapslist->next)
{
gst_caps_get_int (caps, "width", &v4lmjpegsink->width);
gst_caps_get_int (caps, "height", &v4lmjpegsink->height);
if (!gst_v4lmjpegsink_set_playback(v4lmjpegsink,
v4lmjpegsink->width, v4lmjpegsink->height,
v4lmjpegsink->x_offset, v4lmjpegsink->y_offset,
GST_V4LELEMENT(v4lmjpegsink)->vchan.norm, 0)) /* TODO: interlacing */
continue;
/* set buffer info */
if (!gst_v4lmjpegsink_set_buffer(v4lmjpegsink,
v4lmjpegsink->numbufs, v4lmjpegsink->bufsize))
continue;
if (!gst_v4lmjpegsink_playback_init(v4lmjpegsink))
continue;
g_signal_emit (G_OBJECT (v4lmjpegsink), gst_v4lmjpegsink_signals[SIGNAL_HAVE_SIZE], 0,
v4lmjpegsink->width, v4lmjpegsink->height);
return GST_PAD_LINK_OK;
}
/* if we got here - it's not good */
return GST_PAD_LINK_REFUSED;
}
static void
gst_v4lmjpegsink_set_clock (GstElement *element, GstClock *clock)
{
GstV4lMjpegSink *v4mjpegsink = GST_V4LMJPEGSINK (element);
v4mjpegsink->clock = clock;
}
static void
gst_v4lmjpegsink_chain (GstPad *pad,
GstData *_data)
{
GstBuffer *buf = GST_BUFFER (_data);
GstV4lMjpegSink *v4lmjpegsink;
GstClockTimeDiff jitter;
gint num;
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (buf != NULL);
v4lmjpegsink = GST_V4LMJPEGSINK (gst_pad_get_parent (pad));
if (v4lmjpegsink->clock) {
GstClockID id;
GST_DEBUG ("videosink: clock wait: %" G_GUINT64_FORMAT, GST_BUFFER_TIMESTAMP(buf));
jitter = 0; /* FIXME: jitter = gst_clock_current_diff(v4lmjpegsink->clock, GST_BUFFER_TIMESTAMP (buf)); */
if (jitter > 500000 || jitter < -500000)
GST_DEBUG ("jitter: %" G_GINT64_FORMAT, jitter);
id = gst_clock_new_single_shot_id (v4lmjpegsink->clock, GST_BUFFER_TIMESTAMP(buf));
gst_element_clock_wait(GST_ELEMENT(v4lmjpegsink), id, NULL);
gst_clock_id_free (id);
}
if (GST_BUFFER_POOL(buf) == v4lmjpegsink->bufferpool)
{
num = GPOINTER_TO_INT(GST_BUFFER_POOL_PRIVATE(buf));
gst_v4lmjpegsink_play_frame(v4lmjpegsink, num);
}
else
{
/* check size */
if (GST_BUFFER_SIZE(buf) > v4lmjpegsink->breq.size)
{
gst_element_error(GST_ELEMENT(v4lmjpegsink),
"Buffer too big (%d KB), max. buffersize is %d KB",
GST_BUFFER_SIZE(buf)/1024, v4lmjpegsink->breq.size/1024);
return;
}
/* put JPEG data to the device */
gst_v4lmjpegsink_wait_frame(v4lmjpegsink, &num);
memcpy(gst_v4lmjpegsink_get_buffer(v4lmjpegsink, num),
GST_BUFFER_DATA(buf), GST_BUFFER_SIZE(buf));
gst_v4lmjpegsink_play_frame(v4lmjpegsink, num);
}
g_signal_emit(G_OBJECT(v4lmjpegsink),gst_v4lmjpegsink_signals[SIGNAL_FRAME_DISPLAYED],0);
gst_buffer_unref(buf);
}
static GstBuffer *
gst_v4lmjpegsink_buffer_new (GstBufferPool *pool,
guint64 offset,
guint size,
gpointer user_data)
{
GstV4lMjpegSink *v4lmjpegsink = GST_V4LMJPEGSINK(user_data);
GstBuffer *buffer = NULL;
guint8 *data;
gint num;
if (!GST_V4L_IS_ACTIVE(GST_V4LELEMENT(v4lmjpegsink)))
return NULL;
if (v4lmjpegsink->breq.size < size) {
GST_DEBUG ("Requested buffer size is too large (%d > %ld)",
size, v4lmjpegsink->breq.size);
return NULL;
}
if (!gst_v4lmjpegsink_wait_frame(v4lmjpegsink, &num))
return NULL;
data = gst_v4lmjpegsink_get_buffer(v4lmjpegsink, num);
if (!data)
return NULL;
buffer = gst_buffer_new();
GST_BUFFER_DATA(buffer) = data;
GST_BUFFER_MAXSIZE(buffer) = v4lmjpegsink->breq.size;
GST_BUFFER_SIZE(buffer) = size;
GST_BUFFER_POOL(buffer) = pool;
GST_BUFFER_POOL_PRIVATE(buffer) = GINT_TO_POINTER(num);
/* with this flag set, we don't need our own buffer_free() function */
GST_BUFFER_FLAG_SET(buffer, GST_BUFFER_DONTFREE);
return buffer;
}
static void
gst_v4lmjpegsink_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GstV4lMjpegSink *v4lmjpegsink;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_V4LMJPEGSINK (object));
v4lmjpegsink = GST_V4LMJPEGSINK (object);
switch (prop_id)
{
case ARG_NUMBUFS:
v4lmjpegsink->numbufs = g_value_get_int(value);
break;
case ARG_BUFSIZE:
v4lmjpegsink->bufsize = g_value_get_int(value);
break;
case ARG_X_OFFSET:
v4lmjpegsink->x_offset = g_value_get_int(value);
break;
case ARG_Y_OFFSET:
v4lmjpegsink->y_offset = g_value_get_int(value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_v4lmjpegsink_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GstV4lMjpegSink *v4lmjpegsink;
/* it's not null if we got it, but it might not be ours */
v4lmjpegsink = GST_V4LMJPEGSINK(object);
switch (prop_id) {
case ARG_FRAMES_DISPLAYED:
g_value_set_int (value, v4lmjpegsink->frames_displayed);
break;
case ARG_FRAME_TIME:
g_value_set_int (value, v4lmjpegsink->frame_time/1000000);
break;
case ARG_NUMBUFS:
g_value_set_int (value, v4lmjpegsink->numbufs);
break;
case ARG_BUFSIZE:
g_value_set_int (value, v4lmjpegsink->bufsize);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstElementStateReturn
gst_v4lmjpegsink_change_state (GstElement *element)
{
GstV4lMjpegSink *v4lmjpegsink;
GstElementStateReturn parent_value;
g_return_val_if_fail (GST_IS_V4LMJPEGSINK (element), GST_STATE_FAILURE);
v4lmjpegsink = GST_V4LMJPEGSINK(element);
/* set up change state */
switch (GST_STATE_TRANSITION(element)) {
case GST_STATE_READY_TO_PAUSED:
/* we used to do buffer setup here, but that's now done
* right after capsnego */
break;
case GST_STATE_PAUSED_TO_PLAYING:
/* start */
if (!gst_v4lmjpegsink_playback_start(v4lmjpegsink))
return GST_STATE_FAILURE;
break;
case GST_STATE_PLAYING_TO_PAUSED:
/* de-queue all queued buffers */
if (!gst_v4lmjpegsink_playback_stop(v4lmjpegsink))
return GST_STATE_FAILURE;
break;
case GST_STATE_PAUSED_TO_READY:
/* stop playback, unmap all buffers */
if (!gst_v4lmjpegsink_playback_deinit(v4lmjpegsink))
return GST_STATE_FAILURE;
break;
}
if (GST_ELEMENT_CLASS (parent_class)->change_state) {
parent_value = GST_ELEMENT_CLASS (parent_class)->change_state (element);
} else {
parent_value = GST_STATE_FAILURE;
}
if (GST_ELEMENT_CLASS (parent_class)->change_state)
return parent_value;
return GST_STATE_SUCCESS;
}
gboolean
gst_v4lmjpegsink_factory_init (GstPlugin *plugin)
{
GstElementFactory *factory;
GstCaps *caps;
/* create an elementfactory for the v4lmjpegsink element */
factory = gst_element_factory_new("v4lmjpegsink",GST_TYPE_V4LMJPEGSINK,
&gst_v4lmjpegsink_details);
g_return_val_if_fail(factory != NULL, FALSE);
caps = gst_caps_new ("v4lmjpegsink_caps",
"video/x-jpeg",
gst_props_new (
"width", GST_PROPS_INT_RANGE (0, G_MAXINT),
"height", GST_PROPS_INT_RANGE (0, G_MAXINT),
"framerate", GST_PROPS_FLOAT_RANGE (0, G_MAXFLOAT),
NULL )
);
capslist = gst_caps_append(capslist, caps);
sink_template = gst_pad_template_new (
"sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
capslist, NULL);
gst_element_factory_add_pad_template (factory, sink_template);
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
return TRUE;
}
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