gstreamer/sys/winks/gstksvideosrc.c

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/*
* Copyright (C) 2008 Ole André Vadla Ravnås <ole.andre.ravnas@tandberg.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-ksvideosrc
*
* Provides low-latency video capture from WDM cameras on Windows.
*
* <refsect2>
* <title>Example pipelines</title>
* |[
* gst-launch -v ksvideosrc do-stats=TRUE ! ffmpegcolorspace ! dshowvideosink
* ]| Capture from a camera and render using dshowvideosink.
* |[
* gst-launch -v ksvideosrc do-stats=TRUE ! image/jpeg, width=640, height=480
* ! jpegdec ! ffmpegcolorspace ! dshowvideosink
* ]| Capture from an MJPEG camera and render using dshowvideosink.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "gstksvideosrc.h"
#include "gstksclock.h"
#include "gstksvideodevice.h"
#include "kshelpers.h"
#include "ksvideohelpers.h"
#define ENABLE_CLOCK_DEBUG 0
#define DEFAULT_DEVICE_PATH NULL
#define DEFAULT_DEVICE_NAME NULL
#define DEFAULT_DEVICE_INDEX -1
#define DEFAULT_ENSLAVE_KSCLOCK FALSE
#define DEFAULT_DO_STATS FALSE
#define DEFAULT_ENABLE_QUIRKS TRUE
enum
{
PROP_0,
PROP_DEVICE_PATH,
PROP_DEVICE_NAME,
PROP_DEVICE_INDEX,
PROP_ENSLAVE_KSCLOCK,
PROP_DO_STATS,
PROP_FPS,
PROP_ENABLE_QUIRKS,
};
GST_DEBUG_CATEGORY (gst_ks_debug);
#define GST_CAT_DEFAULT gst_ks_debug
typedef struct
{
/* Properties */
gchar *device_path;
gchar *device_name;
gint device_index;
gboolean enslave_ksclock;
gboolean do_stats;
gboolean enable_quirks;
/* State */
GstKsClock *ksclock;
GstKsVideoDevice *device;
guint64 offset;
GstClockTime prev_ts;
/* Statistics */
GstClockTime last_sampling;
guint count;
guint fps;
} GstKsVideoSrcPrivate;
#define GST_KS_VIDEO_SRC_GET_PRIVATE(o) \
(G_TYPE_INSTANCE_GET_PRIVATE ((o), GST_TYPE_KS_VIDEO_SRC, \
GstKsVideoSrcPrivate))
static void gst_ks_video_src_finalize (GObject * object);
static void gst_ks_video_src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_ks_video_src_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_ks_video_src_reset (GstKsVideoSrc * self);
static GstStateChangeReturn gst_ks_video_src_change_state (GstElement * element,
GstStateChange transition);
static gboolean gst_ks_video_src_set_clock (GstElement * element,
GstClock * clock);
static GstCaps *gst_ks_video_src_get_caps (GstBaseSrc * basesrc);
static gboolean gst_ks_video_src_set_caps (GstBaseSrc * basesrc,
GstCaps * caps);
static void gst_ks_video_src_fixate (GstBaseSrc * basesrc, GstCaps * caps);
static gboolean gst_ks_video_src_query (GstBaseSrc * basesrc, GstQuery * query);
static gboolean gst_ks_video_src_unlock (GstBaseSrc * basesrc);
static gboolean gst_ks_video_src_unlock_stop (GstBaseSrc * basesrc);
static GstFlowReturn gst_ks_video_src_create (GstPushSrc * pushsrc,
GstBuffer ** buffer);
GST_BOILERPLATE (GstKsVideoSrc, gst_ks_video_src, GstPushSrc,
GST_TYPE_PUSH_SRC);
static void
gst_ks_video_src_base_init (gpointer gclass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (gclass);
static GstElementDetails element_details = {
"KsVideoSrc",
"Source/Video",
"Stream data from a video capture device through Windows kernel streaming",
"Ole André Vadla Ravnås <ole.andre.ravnas@tandberg.com>\n"
"Haakon Sporsheim <hakon.sporsheim@tandberg.com>"
};
gst_element_class_set_details (element_class, &element_details);
gst_element_class_add_pad_template (element_class,
gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
ks_video_get_all_caps ()));
}
static void
gst_ks_video_src_class_init (GstKsVideoSrcClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
GstBaseSrcClass *gstbasesrc_class = GST_BASE_SRC_CLASS (klass);
GstPushSrcClass *gstpushsrc_class = GST_PUSH_SRC_CLASS (klass);
g_type_class_add_private (klass, sizeof (GstKsVideoSrcPrivate));
gobject_class->finalize = gst_ks_video_src_finalize;
gobject_class->get_property = gst_ks_video_src_get_property;
gobject_class->set_property = gst_ks_video_src_set_property;
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_ks_video_src_change_state);
gstelement_class->set_clock = GST_DEBUG_FUNCPTR (gst_ks_video_src_set_clock);
gstbasesrc_class->get_caps = GST_DEBUG_FUNCPTR (gst_ks_video_src_get_caps);
gstbasesrc_class->set_caps = GST_DEBUG_FUNCPTR (gst_ks_video_src_set_caps);
gstbasesrc_class->fixate = GST_DEBUG_FUNCPTR (gst_ks_video_src_fixate);
gstbasesrc_class->query = GST_DEBUG_FUNCPTR (gst_ks_video_src_query);
gstbasesrc_class->unlock = GST_DEBUG_FUNCPTR (gst_ks_video_src_unlock);
gstbasesrc_class->unlock_stop =
GST_DEBUG_FUNCPTR (gst_ks_video_src_unlock_stop);
gstpushsrc_class->create = GST_DEBUG_FUNCPTR (gst_ks_video_src_create);
g_object_class_install_property (gobject_class, PROP_DEVICE_PATH,
g_param_spec_string ("device-path", "Device Path",
"The device path", DEFAULT_DEVICE_PATH,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_DEVICE_NAME,
g_param_spec_string ("device-name", "Device Name",
"The human-readable device name", DEFAULT_DEVICE_NAME,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_DEVICE_INDEX,
g_param_spec_int ("device-index", "Device Index",
"The zero-based device index", -1, G_MAXINT, DEFAULT_DEVICE_INDEX,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_ENSLAVE_KSCLOCK,
g_param_spec_boolean ("enslave-ksclock", "Enslave the clock used by KS",
"Enslave the clocked used by Kernel Streaming",
DEFAULT_ENSLAVE_KSCLOCK, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_DO_STATS,
g_param_spec_boolean ("do-stats", "Enable statistics",
"Enable logging of statistics", DEFAULT_DO_STATS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_FPS,
g_param_spec_int ("fps", "Frames per second",
"Last measured framerate, if statistics are enabled",
-1, G_MAXINT, -1, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_ENABLE_QUIRKS,
g_param_spec_boolean ("enable-quirks", "Enable quirks",
"Enable driver-specific quirks", DEFAULT_ENABLE_QUIRKS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
GST_DEBUG_CATEGORY_INIT (gst_ks_debug, "ksvideosrc",
0, "Kernel streaming video source");
}
static void
gst_ks_video_src_init (GstKsVideoSrc * self, GstKsVideoSrcClass * gclass)
{
GstKsVideoSrcPrivate *priv = GST_KS_VIDEO_SRC_GET_PRIVATE (self);
GstBaseSrc *basesrc = GST_BASE_SRC (self);
gst_base_src_set_live (basesrc, TRUE);
gst_base_src_set_format (basesrc, GST_FORMAT_TIME);
gst_ks_video_src_reset (self);
priv->device_path = DEFAULT_DEVICE_PATH;
priv->device_name = DEFAULT_DEVICE_NAME;
priv->device_index = DEFAULT_DEVICE_INDEX;
priv->enslave_ksclock = DEFAULT_ENSLAVE_KSCLOCK;
priv->do_stats = DEFAULT_DO_STATS;
priv->enable_quirks = DEFAULT_ENABLE_QUIRKS;
}
static void
gst_ks_video_src_finalize (GObject * object)
{
GstKsVideoSrc *self = GST_KS_VIDEO_SRC (object);
GstKsVideoSrcPrivate *priv = GST_KS_VIDEO_SRC_GET_PRIVATE (self);
g_free (priv->device_name);
g_free (priv->device_path);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_ks_video_src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstKsVideoSrc *self = GST_KS_VIDEO_SRC (object);
GstKsVideoSrcPrivate *priv = GST_KS_VIDEO_SRC_GET_PRIVATE (self);
switch (prop_id) {
case PROP_DEVICE_PATH:
g_value_set_string (value, priv->device_path);
break;
case PROP_DEVICE_NAME:
g_value_set_string (value, priv->device_name);
break;
case PROP_DEVICE_INDEX:
g_value_set_int (value, priv->device_index);
break;
case PROP_ENSLAVE_KSCLOCK:
g_value_set_boolean (value, priv->enslave_ksclock);
break;
case PROP_DO_STATS:
GST_OBJECT_LOCK (object);
g_value_set_boolean (value, priv->do_stats);
GST_OBJECT_UNLOCK (object);
break;
case PROP_FPS:
GST_OBJECT_LOCK (object);
g_value_set_int (value, priv->fps);
GST_OBJECT_UNLOCK (object);
break;
case PROP_ENABLE_QUIRKS:
g_value_set_boolean (value, priv->enable_quirks);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_ks_video_src_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstKsVideoSrc *self = GST_KS_VIDEO_SRC (object);
GstKsVideoSrcPrivate *priv = GST_KS_VIDEO_SRC_GET_PRIVATE (self);
switch (prop_id) {
case PROP_DEVICE_PATH:
g_free (priv->device_path);
priv->device_path = g_value_dup_string (value);
break;
case PROP_DEVICE_NAME:
g_free (priv->device_name);
priv->device_name = g_value_dup_string (value);
break;
case PROP_DEVICE_INDEX:
priv->device_index = g_value_get_int (value);
break;
case PROP_ENSLAVE_KSCLOCK:
GST_OBJECT_LOCK (object);
if (priv->device == NULL)
priv->enslave_ksclock = g_value_get_boolean (value);
else
g_warning ("enslave-ksclock may only be changed while in NULL state");
GST_OBJECT_UNLOCK (object);
break;
case PROP_DO_STATS:
GST_OBJECT_LOCK (object);
priv->do_stats = g_value_get_boolean (value);
GST_OBJECT_UNLOCK (object);
break;
case PROP_ENABLE_QUIRKS:
priv->enable_quirks = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_ks_video_src_reset (GstKsVideoSrc * self)
{
GstKsVideoSrcPrivate *priv = GST_KS_VIDEO_SRC_GET_PRIVATE (self);
/* Reset statistics */
priv->last_sampling = GST_CLOCK_TIME_NONE;
priv->count = 0;
priv->fps = -1;
/* Reset timestamping state */
priv->offset = 0;
priv->prev_ts = GST_CLOCK_TIME_NONE;
}
static void
gst_ks_video_src_apply_driver_quirks (GstKsVideoSrc * self)
{
GstKsVideoSrcPrivate *priv = GST_KS_VIDEO_SRC_GET_PRIVATE (self);
HMODULE mod;
/*
* Logitech's driver software injects the following DLL into all processes
* spawned. This DLL does lots of nasty tricks, sitting in between the
* application and the low-level ntdll API (NtCreateFile, NtClose,
* NtDeviceIoControlFile, NtDuplicateObject, etc.), making all sorts
* of assumptions on which application threads do what.
*
* We could later work around this by having a worker-thread open the
* device, take care of doing set_caps() when asked to, closing the device
* when shutting down, and so forth.
*
* The only regression that this quirk causes is that the video effects
* feature doesn't work.
*/
mod = GetModuleHandle ("LVPrcInj.dll");
if (mod != NULL) {
GST_DEBUG_OBJECT (self, "hostile Logitech DLL detected, neutralizing it");
/*
* We know that no-one's actually keeping this handle around to decrement
* its reference count, so we'll take care of that job. The DLL's DllMain
* implementation takes care of rolling back changes when it gets unloaded,
* so this seems to be the cleanest and most future-proof way that we can
* get rid of it...
*/
FreeLibrary (mod);
/* Paranoia: verify that it's no longer there */
mod = GetModuleHandle ("LVPrcInj.dll");
if (mod != NULL)
GST_WARNING_OBJECT (self, "failed to neutralize hostile Logitech DLL");
}
}
static gboolean
gst_ks_video_src_open_device (GstKsVideoSrc * self)
{
GstKsVideoSrcPrivate *priv = GST_KS_VIDEO_SRC_GET_PRIVATE (self);
GstKsVideoDevice *device = NULL;
GList *devices, *cur;
g_assert (priv->device == NULL);
devices = ks_enumerate_devices (&KSCATEGORY_VIDEO);
if (devices == NULL)
goto error_no_devices;
for (cur = devices; cur != NULL; cur = cur->next) {
KsDeviceEntry *entry = cur->data;
GST_DEBUG_OBJECT (self, "device %d: name='%s' path='%s'",
entry->index, entry->name, entry->path);
}
for (cur = devices; cur != NULL && device == NULL; cur = cur->next) {
KsDeviceEntry *entry = cur->data;
gboolean match;
if (priv->device_path != NULL) {
match = g_strcasecmp (entry->path, priv->device_path) == 0;
} else if (priv->device_name != NULL) {
match = g_strcasecmp (entry->name, priv->device_name) == 0;
} else if (priv->device_index >= 0) {
match = entry->index == priv->device_index;
} else {
match = TRUE; /* pick the first entry */
}
if (match) {
priv->ksclock = NULL;
if (priv->enslave_ksclock) {
priv->ksclock = g_object_new (GST_TYPE_KS_CLOCK, NULL);
if (priv->ksclock != NULL && !gst_ks_clock_open (priv->ksclock)) {
g_object_unref (priv->ksclock);
priv->ksclock = NULL;
}
if (priv->ksclock == NULL)
GST_WARNING_OBJECT (self, "Failed to create/open KsClock");
}
device = g_object_new (GST_TYPE_KS_VIDEO_DEVICE,
"clock", priv->ksclock, "device-path", entry->path, NULL);
}
ks_device_entry_free (entry);
}
g_list_free (devices);
if (device == NULL)
goto error_no_match;
if (!gst_ks_video_device_open (device))
goto error_open;
priv->device = device;
return TRUE;
/* ERRORS */
error_no_devices:
{
GST_ELEMENT_ERROR (self, RESOURCE, NOT_FOUND,
("No video capture devices found"), (NULL));
return FALSE;
}
error_no_match:
{
if (priv->device_path != NULL) {
GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
("Specified video capture device with path '%s' not found",
priv->device_path), (NULL));
} else if (priv->device_name != NULL) {
GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
("Specified video capture device with name '%s' not found",
priv->device_name), (NULL));
} else {
GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
("Specified video capture device with index %d not found",
priv->device_index), (NULL));
}
return FALSE;
}
error_open:
{
GST_ELEMENT_ERROR (self, RESOURCE, OPEN_READ,
("Failed to open device"), (NULL));
g_object_unref (device);
return FALSE;
}
}
static void
gst_ks_video_src_close_device (GstKsVideoSrc * self)
{
GstKsVideoSrcPrivate *priv = GST_KS_VIDEO_SRC_GET_PRIVATE (self);
g_assert (priv->device != NULL);
gst_ks_video_device_close (priv->device);
g_object_unref (priv->device);
priv->device = NULL;
if (priv->ksclock != NULL) {
gst_ks_clock_close (priv->ksclock);
g_object_unref (priv->ksclock);
priv->ksclock = NULL;
}
gst_ks_video_src_reset (self);
}
static GstStateChangeReturn
gst_ks_video_src_change_state (GstElement * element, GstStateChange transition)
{
GstKsVideoSrc *self = GST_KS_VIDEO_SRC (element);
GstKsVideoSrcPrivate *priv = GST_KS_VIDEO_SRC_GET_PRIVATE (self);
GstStateChangeReturn ret;
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
if (priv->enable_quirks)
gst_ks_video_src_apply_driver_quirks (self);
if (!gst_ks_video_src_open_device (self))
goto open_failed;
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_NULL:
gst_ks_video_src_close_device (self);
break;
}
return ret;
/* ERRORS */
open_failed:
{
return GST_STATE_CHANGE_FAILURE;
}
}
static gboolean
gst_ks_video_src_set_clock (GstElement * element, GstClock * clock)
{
GstKsVideoSrc *self = GST_KS_VIDEO_SRC (element);
GstKsVideoSrcPrivate *priv = GST_KS_VIDEO_SRC_GET_PRIVATE (self);
GST_OBJECT_LOCK (element);
if (priv->ksclock != NULL)
gst_ks_clock_provide_master_clock (priv->ksclock, clock);
GST_OBJECT_UNLOCK (element);
return TRUE;
}
static GstCaps *
gst_ks_video_src_get_caps (GstBaseSrc * basesrc)
{
GstKsVideoSrc *self = GST_KS_VIDEO_SRC (basesrc);
GstKsVideoSrcPrivate *priv = GST_KS_VIDEO_SRC_GET_PRIVATE (self);
if (priv->device != NULL)
return gst_ks_video_device_get_available_caps (priv->device);
else
return NULL; /* BaseSrc will return template caps */
}
static gboolean
gst_ks_video_src_set_caps (GstBaseSrc * basesrc, GstCaps * caps)
{
GstKsVideoSrc *self = GST_KS_VIDEO_SRC (basesrc);
GstKsVideoSrcPrivate *priv = GST_KS_VIDEO_SRC_GET_PRIVATE (self);
if (priv->device == NULL)
return FALSE;
if (!gst_ks_video_device_set_caps (priv->device, caps))
return FALSE;
if (!gst_ks_video_device_set_state (priv->device, KSSTATE_RUN))
return FALSE;
return TRUE;
}
static void
gst_ks_video_src_fixate (GstBaseSrc * basesrc, GstCaps * caps)
{
GstStructure *structure = gst_caps_get_structure (caps, 0);
gst_structure_fixate_field_nearest_int (structure, "width", G_MAXINT);
gst_structure_fixate_field_nearest_int (structure, "height", G_MAXINT);
gst_structure_fixate_field_nearest_fraction (structure, "framerate",
G_MAXINT, 1);
}
static gboolean
gst_ks_video_src_query (GstBaseSrc * basesrc, GstQuery * query)
{
GstKsVideoSrc *self = GST_KS_VIDEO_SRC (basesrc);
GstKsVideoSrcPrivate *priv = GST_KS_VIDEO_SRC_GET_PRIVATE (self);
gboolean result = FALSE;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_LATENCY:{
GstClockTime min_latency, max_latency;
if (priv->device == NULL)
goto beach;
result = gst_ks_video_device_get_latency (priv->device, &min_latency,
&max_latency);
if (!result)
goto beach;
GST_DEBUG_OBJECT (self, "reporting latency of min %" GST_TIME_FORMAT
" max %" GST_TIME_FORMAT,
GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
gst_query_set_latency (query, TRUE, min_latency, max_latency);
break;
}
default:
result = GST_BASE_SRC_CLASS (parent_class)->query (basesrc, query);
break;
}
beach:
return result;
}
static gboolean
gst_ks_video_src_unlock (GstBaseSrc * basesrc)
{
GstKsVideoSrc *self = GST_KS_VIDEO_SRC (basesrc);
GstKsVideoSrcPrivate *priv = GST_KS_VIDEO_SRC_GET_PRIVATE (self);
GST_DEBUG_OBJECT (self, "%s", G_STRFUNC);
gst_ks_video_device_cancel (priv->device);
return TRUE;
}
static gboolean
gst_ks_video_src_unlock_stop (GstBaseSrc * basesrc)
{
GstKsVideoSrc *self = GST_KS_VIDEO_SRC (basesrc);
GstKsVideoSrcPrivate *priv = GST_KS_VIDEO_SRC_GET_PRIVATE (self);
GST_DEBUG_OBJECT (self, "%s", G_STRFUNC);
gst_ks_video_device_cancel_stop (priv->device);
return TRUE;
}
static gboolean
gst_ks_video_src_timestamp_buffer (GstKsVideoSrc * self, GstBuffer * buf,
GstClockTime presentation_time)
{
GstKsVideoSrcPrivate *priv = GST_KS_VIDEO_SRC_GET_PRIVATE (self);
GstClockTime duration;
GstClock *clock;
GstClockTime timestamp;
duration = gst_ks_video_device_get_duration (priv->device);
GST_OBJECT_LOCK (self);
clock = GST_ELEMENT_CLOCK (self);
if (clock != NULL) {
gst_object_ref (clock);
timestamp = GST_ELEMENT (self)->base_time;
if (GST_CLOCK_TIME_IS_VALID (presentation_time)) {
if (presentation_time > GST_ELEMENT (self)->base_time)
presentation_time -= GST_ELEMENT (self)->base_time;
else
presentation_time = 0;
}
} else {
timestamp = GST_CLOCK_TIME_NONE;
}
GST_OBJECT_UNLOCK (self);
if (clock != NULL) {
/* The time according to the current clock */
timestamp = gst_clock_get_time (clock) - timestamp;
if (timestamp > duration)
timestamp -= duration;
else
timestamp = 0;
if (GST_CLOCK_TIME_IS_VALID (presentation_time)) {
GstClockTimeDiff diff = GST_CLOCK_DIFF (timestamp, presentation_time);
GST_DEBUG_OBJECT (self, "Diff between our and the driver's timestamp: %"
G_GINT64_FORMAT, diff);
}
gst_object_unref (clock);
clock = NULL;
/* Unless it's the first frame, align the current timestamp on a multiple
* of duration since the previous */
if (GST_CLOCK_TIME_IS_VALID (priv->prev_ts)) {
GstClockTime delta;
guint delta_remainder, delta_offset;
/* REVISIT: I've seen this happen with the GstSystemClock on Windows,
* scary... */
if (timestamp < priv->prev_ts) {
GST_WARNING_OBJECT (self, "clock is ticking backwards");
return FALSE;
}
/* Round to a duration boundary */
delta = timestamp - priv->prev_ts;
delta_remainder = delta % duration;
if (delta_remainder < duration / 3)
timestamp -= delta_remainder;
else
timestamp += duration - delta_remainder;
/* How many frames are we off then? */
delta = timestamp - priv->prev_ts;
delta_offset = delta / duration;
if (delta_offset == 1) /* perfect */
GST_BUFFER_FLAG_UNSET (buf, GST_BUFFER_FLAG_DISCONT);
else if (delta_offset > 1) {
guint lost = delta_offset - 1;
#if ENABLE_CLOCK_DEBUG
GST_INFO_OBJECT (self, "lost %d frame%s, setting discont flag",
lost, (lost > 1) ? "s" : "");
#endif
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
} else if (delta_offset == 0) { /* overproduction, skip this frame */
#if ENABLE_CLOCK_DEBUG
GST_INFO_OBJECT (self, "skipping frame");
#endif
return FALSE;
}
priv->offset += delta_offset;
}
priv->prev_ts = timestamp;
}
GST_BUFFER_OFFSET (buf) = priv->offset;
GST_BUFFER_OFFSET_END (buf) = GST_BUFFER_OFFSET (buf) + 1;
GST_BUFFER_TIMESTAMP (buf) = timestamp;
GST_BUFFER_DURATION (buf) = duration;
return TRUE;
}
static void
gst_ks_video_src_update_statistics (GstKsVideoSrc * self)
{
GstKsVideoSrcPrivate *priv = GST_KS_VIDEO_SRC_GET_PRIVATE (self);
GstClock *clock;
GST_OBJECT_LOCK (self);
clock = GST_ELEMENT_CLOCK (self);
if (clock != NULL)
gst_object_ref (clock);
GST_OBJECT_UNLOCK (self);
if (clock != NULL) {
GstClockTime now = gst_clock_get_time (clock);
gst_object_unref (clock);
priv->count++;
if (GST_CLOCK_TIME_IS_VALID (priv->last_sampling)) {
if (now - priv->last_sampling >= GST_SECOND) {
GST_OBJECT_LOCK (self);
priv->fps = priv->count;
GST_OBJECT_UNLOCK (self);
g_object_notify (G_OBJECT (self), "fps");
priv->last_sampling = now;
priv->count = 0;
}
} else {
priv->last_sampling = now;
}
}
}
static GstFlowReturn
gst_ks_video_src_create (GstPushSrc * pushsrc, GstBuffer ** buffer)
{
GstKsVideoSrc *self = GST_KS_VIDEO_SRC (pushsrc);
GstKsVideoSrcPrivate *priv = GST_KS_VIDEO_SRC_GET_PRIVATE (self);
guint buf_size;
GstCaps *caps;
GstBuffer *buf = NULL;
GstFlowReturn result;
GstClockTime presentation_time;
gulong error_code;
gchar *error_str;
g_assert (priv->device != NULL);
if (!gst_ks_video_device_has_caps (priv->device))
goto error_no_caps;
buf_size = gst_ks_video_device_get_frame_size (priv->device);
g_assert (buf_size);
caps = gst_pad_get_negotiated_caps (GST_BASE_SRC_PAD (self));
if (caps == NULL)
goto error_no_caps;
result = gst_pad_alloc_buffer (GST_BASE_SRC_PAD (self), priv->offset,
buf_size, caps, &buf);
gst_caps_unref (caps);
if (G_UNLIKELY (result != GST_FLOW_OK))
goto error_alloc_buffer;
do {
gulong bytes_read;
result = gst_ks_video_device_read_frame (priv->device,
GST_BUFFER_DATA (buf), buf_size, &bytes_read, &presentation_time,
&error_code, &error_str);
if (G_UNLIKELY (result != GST_FLOW_OK))
goto error_read_frame;
GST_BUFFER_SIZE (buf) = bytes_read;
}
while (!gst_ks_video_src_timestamp_buffer (self, buf, presentation_time));
if (G_UNLIKELY (priv->do_stats))
gst_ks_video_src_update_statistics (self);
gst_ks_video_device_postprocess_frame (priv->device,
GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
*buffer = buf;
return GST_FLOW_OK;
/* ERRORS */
error_no_caps:
{
GST_ELEMENT_ERROR (self, CORE, NEGOTIATION,
("not negotiated"), ("maybe setcaps failed?"));
return GST_FLOW_ERROR;
}
error_alloc_buffer:
{
GST_ELEMENT_ERROR (self, CORE, PAD, ("alloc_buffer failed"), (NULL));
return result;
}
error_read_frame:
{
if (result != GST_FLOW_WRONG_STATE && result != GST_FLOW_UNEXPECTED) {
GST_ELEMENT_ERROR (self, RESOURCE, READ,
("read failed: %s [0x%08x]", error_str, error_code),
("gst_ks_video_device_read_frame failed"));
}
g_free (error_str);
gst_buffer_unref (buf);
return result;
}
}
static gboolean
plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "ksvideosrc",
GST_RANK_NONE, GST_TYPE_KS_VIDEO_SRC);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"winks",
"Windows kernel streaming plugin",
plugin_init, VERSION, "LGPL", "GStreamer", "http://gstreamer.net/")