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Implement element synchronization (#108301)

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Original commit message from CVS:
Implement element synchronization (#108301)
This commit is contained in:
Ronald S. Bultje 2003-05-02 21:16:56 +00:00
parent 98cfd56ea3
commit cbd4b72d7c
3 changed files with 242 additions and 28 deletions
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235
sys/v4l2/gstv4l2src.c
View file

@ -34,7 +34,10 @@ static GstElementDetails gst_v4l2src_details = {
/* V4l2Src signals and args */
enum {
/* FILL ME */
SIGNAL_FRAME_CAPTURE,
SIGNAL_FRAME_DROP,
SIGNAL_FRAME_INSERT,
SIGNAL_FRAME_LOST,
LAST_SIGNAL
};
@ -46,7 +49,8 @@ enum {
ARG_PALETTE,
ARG_PALETTE_NAMES,
ARG_NUMBUFS,
ARG_BUFSIZE
ARG_BUFSIZE,
ARG_USE_FIXED_FPS
};
@ -66,7 +70,7 @@ static gboolean gst_v4l2src_srcconvert (GstPad *pad,
gint64 src_value,
GstFormat *dest_format,
gint64 *dest_value);
static GstPadLinkReturn gst_v4l2src_srcconnect (GstPad *pad,
static GstPadLinkReturn gst_v4l2src_srcconnect (GstPad *pad,
GstCaps *caps);
static GstCaps * gst_v4l2src_getcaps (GstPad *pad,
GstCaps *caps);
@ -85,6 +89,11 @@ static void gst_v4l2src_get_property (GObject *object,
/* state handling */
static GstElementStateReturn gst_v4l2src_change_state (GstElement *element);
/* set_clock function for A/V sync */
static void gst_v4l2src_set_clock (GstElement *element,
GstClock *clock);
/* bufferpool functions */
static GstBuffer * gst_v4l2src_buffer_new (GstBufferPool *pool,
guint64 offset,
@ -98,7 +107,7 @@ static void gst_v4l2src_buffer_free (GstBufferPool *pool,
static GstPadTemplate *src_template;
static GstElementClass *parent_class = NULL;
/*static guint gst_v4l2src_signals[LAST_SIGNAL] = { 0 }; */
static guint gst_v4l2src_signals[LAST_SIGNAL] = { 0 };
GType
@ -141,24 +150,53 @@ gst_v4l2src_class_init (GstV4l2SrcClass *klass)
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_WIDTH,
g_param_spec_int("width","width","width",
G_MININT,G_MAXINT,0,G_PARAM_READWRITE));
G_MININT,G_MAXINT,0,G_PARAM_READWRITE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_HEIGHT,
g_param_spec_int("height","height","height",
G_MININT,G_MAXINT,0,G_PARAM_READWRITE));
G_MININT,G_MAXINT,0,G_PARAM_READWRITE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_PALETTE,
g_param_spec_int("palette","palette","palette",
G_MININT,G_MAXINT,0,G_PARAM_READWRITE));
G_MININT,G_MAXINT,0,G_PARAM_READWRITE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_PALETTE_NAMES,
g_param_spec_pointer("palette_name","palette_name","palette_name",
G_PARAM_READABLE));
G_PARAM_READABLE));
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_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_READABLE));
G_MININT,G_MAXINT,0,G_PARAM_READABLE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_USE_FIXED_FPS,
g_param_spec_boolean("use_fixed_fps", "Use Fixed FPS",
"Drop/Insert frames to reach a certain FPS (TRUE) "
"or adapt FPS to suit the number of frabbed frames",
TRUE, G_PARAM_READWRITE));
/* signals */
gst_v4l2src_signals[SIGNAL_FRAME_CAPTURE] =
g_signal_new("frame_capture", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET(GstV4l2SrcClass, frame_capture),
NULL, NULL, g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
gst_v4l2src_signals[SIGNAL_FRAME_DROP] =
g_signal_new("frame_drop", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET(GstV4l2SrcClass, frame_drop),
NULL, NULL, g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
gst_v4l2src_signals[SIGNAL_FRAME_INSERT] =
g_signal_new("frame_insert", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET(GstV4l2SrcClass, frame_insert),
NULL, NULL, g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
gst_v4l2src_signals[SIGNAL_FRAME_LOST] =
g_signal_new("frame_lost", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET(GstV4l2SrcClass, frame_lost),
NULL, NULL, g_cclosure_marshal_VOID__INT,
G_TYPE_NONE, 1, G_TYPE_INT);
gobject_class->set_property = gst_v4l2src_set_property;
gobject_class->get_property = gst_v4l2src_get_property;
@ -167,6 +205,8 @@ gst_v4l2src_class_init (GstV4l2SrcClass *klass)
v4l2_class->open = gst_v4l2src_open;
v4l2_class->close = gst_v4l2src_close;
gstelement_class->set_clock = gst_v4l2src_set_clock;
}
@ -194,6 +234,12 @@ gst_v4l2src_init (GstV4l2Src *v4l2src)
v4l2src->formats = NULL;
v4l2src->format_list = NULL;
/* no clock */
v4l2src->clock = NULL;
/* fps */
v4l2src->use_fixed_fps = TRUE;
}
@ -213,19 +259,23 @@ gst_v4l2src_close (GstElement *element,
}
static gboolean
gst_v4l2src_srcconvert (GstPad *pad,
GstFormat src_format,
gint64 src_value,
GstFormat *dest_format,
gint64 *dest_value)
static gdouble
gst_v4l2src_get_fps (GstV4l2Src *v4l2src)
{
GstV4l2Src *v4l2src;
gint norm;
struct v4l2_standard *std;
gdouble fps;
v4l2src = GST_V4L2SRC (gst_pad_get_parent (pad));
if (!v4l2src->use_fixed_fps &&
v4l2src->clock != NULL &&
v4l2src->handled > 0) {
/* try to get time from clock master and calculate fps */
GstClockTime time = gst_clock_get_time(v4l2src->clock) -
v4l2src->substract_time;
return v4l2src->handled * GST_SECOND / time;
}
/* if that failed ... */
if (!GST_V4L2_IS_OPEN(GST_V4L2ELEMENT(v4l2src)))
return FALSE;
@ -236,6 +286,25 @@ gst_v4l2src_srcconvert (GstPad *pad,
std = ((struct v4l2_standard *) g_list_nth_data(GST_V4L2ELEMENT(v4l2src)->norms, norm));
fps = std->frameperiod.numerator / std->frameperiod.denominator;
return fps;
}
static gboolean
gst_v4l2src_srcconvert (GstPad *pad,
GstFormat src_format,
gint64 src_value,
GstFormat *dest_format,
gint64 *dest_value)
{
GstV4l2Src *v4l2src;
gdouble fps;
v4l2src = GST_V4L2SRC (gst_pad_get_parent (pad));
if ((fps = gst_v4l2src_get_fps(v4l2src)) == 0)
return FALSE;
switch (src_format) {
case GST_FORMAT_TIME:
switch (*dest_format) {
@ -679,11 +748,16 @@ gst_v4l2src_get (GstPad *pad)
GstV4l2Src *v4l2src;
GstBuffer *buf;
gint num;
gdouble fps = 0;
g_return_val_if_fail (pad != NULL, NULL);
v4l2src = GST_V4L2SRC(gst_pad_get_parent (pad));
if (v4l2src->use_fixed_fps &&
(fps = gst_v4l2src_get_fps(v4l2src)) == 0)
return NULL;
buf = gst_buffer_new_from_pool(v4l2src->bufferpool, 0, 0);
if (!buf) {
gst_element_error(GST_ELEMENT(v4l2src),
@ -691,16 +765,91 @@ gst_v4l2src_get (GstPad *pad)
return NULL;
}
/* grab a frame from the device */
if (!gst_v4l2src_grab_frame(v4l2src, &num))
return NULL;
if (v4l2src->need_writes > 0) {
/* use last frame */
num = v4l2src->last_frame;
v4l2src->need_writes--;
} else if (v4l2src->clock && v4l2src->use_fixed_fps) {
GstClockTime time;
gboolean have_frame = FALSE;
do {
/* by default, we use the frame once */
v4l2src->need_writes = 1;
/* grab a frame from the device */
if (!gst_v4l2src_grab_frame(v4l2src, &num))
return NULL;
v4l2src->last_frame = num;
time = GST_TIMEVAL_TO_TIME(v4l2src->bufsettings.timestamp) -
v4l2src->substract_time;
/* first check whether we lost any frames according to the device */
if (v4l2src->last_seq != 0) {
if (v4l2src->bufsettings.sequence - v4l2src->last_seq > 1) {
v4l2src->need_writes = v4l2src->bufsettings.sequence -
v4l2src->last_seq;
g_signal_emit(G_OBJECT(v4l2src),
gst_v4l2src_signals[SIGNAL_FRAME_LOST],
0,
v4l2src->bufsettings.sequence -
v4l2src->last_seq - 1);
}
}
v4l2src->last_seq = v4l2src->bufsettings.sequence;
/* decide how often we're going to write the frame - set
* v4lmjpegsrc->need_writes to (that-1) and have_frame to TRUE
* if we're going to write it - else, just continue.
*
* time is generally the system or audio clock. Let's
* say that we've written one second of audio, then we want
* to have written one second of video too, within the same
* timeframe. This means that if time - begin_time = X sec,
* we want to have written X*fps frames. If we've written
* more - drop, if we've written less - dup... */
if (v4l2src->handled * fps * GST_SECOND - time >
1.5 * fps * GST_SECOND) {
/* yo dude, we've got too many frames here! Drop! DROP! */
v4l2src->need_writes--; /* -= (v4l2src->handled - (time / fps)); */
g_signal_emit(G_OBJECT(v4l2src),
gst_v4l2src_signals[SIGNAL_FRAME_DROP], 0);
} else if (v4l2src->handled * fps * GST_SECOND - time <
-1.5 * fps * GST_SECOND) {
/* this means we're lagging far behind */
v4l2src->need_writes++; /* += ((time / fps) - v4l2src->handled); */
g_signal_emit(G_OBJECT(v4l2src),
gst_v4l2src_signals[SIGNAL_FRAME_INSERT], 0);
}
if (v4l2src->need_writes > 0) {
have_frame = TRUE;
v4l2src->use_num_times[num] = v4l2src->need_writes;
v4l2src->need_writes--;
} else {
gst_v4l2src_requeue_frame(v4l2src, num);
}
} while (!have_frame);
} else {
/* grab a frame from the device */
if (!gst_v4l2src_grab_frame(v4l2src, &num))
return NULL;
v4l2src->use_num_times[num] = 1;
}
GST_BUFFER_DATA(buf) = GST_V4L2ELEMENT(v4l2src)->buffer[num];
GST_BUFFER_SIZE(buf) = v4l2src->bufsettings.bytesused;
if (!v4l2src->first_timestamp)
v4l2src->first_timestamp = v4l2src->bufsettings.timestamp.tv_sec * GST_SECOND +
v4l2src->bufsettings.timestamp.tv_usec * (GST_SECOND/1000000);
GST_BUFFER_TIMESTAMP(buf) = v4l2src->bufsettings.length - v4l2src->first_timestamp;
if (v4l2src->use_fixed_fps)
GST_BUFFER_TIMESTAMP(buf) = v4l2src->handled * GST_SECOND / fps;
else /* calculate time based on our own clock */
GST_BUFFER_TIMESTAMP(buf) = GST_TIMEVAL_TO_TIME(v4l2src->bufsettings.timestamp) -
v4l2src->substract_time;
v4l2src->handled++;
g_signal_emit(G_OBJECT(v4l2src),
gst_v4l2src_signals[SIGNAL_FRAME_CAPTURE], 0);
return buf;
}
@ -741,6 +890,12 @@ gst_v4l2src_set_property (GObject *object,
}
break;
case ARG_USE_FIXED_FPS:
if (!GST_V4L2_IS_ACTIVE(GST_V4L2ELEMENT(v4l2src))) {
v4l2src->use_fixed_fps = g_value_get_boolean(value);
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -784,6 +939,10 @@ gst_v4l2src_get_property (GObject *object,
g_value_set_int(value, v4l2src->format.fmt.pix.sizeimage);
break;
case ARG_USE_FIXED_FPS:
g_value_set_boolean(value, v4l2src->use_fixed_fps);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -797,6 +956,7 @@ gst_v4l2src_change_state (GstElement *element)
GstV4l2Src *v4l2src;
gint transition = GST_STATE_TRANSITION (element);
GstElementStateReturn parent_return;
GTimeVal time;
g_return_val_if_fail(GST_IS_V4L2SRC(element), GST_STATE_FAILURE);
v4l2src = GST_V4L2SRC(element);
@ -813,15 +973,25 @@ gst_v4l2src_change_state (GstElement *element)
return GST_STATE_FAILURE;
break;
case GST_STATE_READY_TO_PAUSED:
v4l2src->first_timestamp = 0;
v4l2src->handled = 0;
v4l2src->need_writes = 0;
v4l2src->last_frame = 0;
v4l2src->substract_time = 0;
/* buffer setup moved to capsnego */
break;
case GST_STATE_PAUSED_TO_PLAYING:
/* queue all buffer, start streaming capture */
if (!gst_v4l2src_capture_start(v4l2src))
return GST_STATE_FAILURE;
g_get_current_time(&time);
v4l2src->substract_time = GST_TIMEVAL_TO_TIME(time) -
v4l2src->substract_time;
v4l2src->last_seq = 0;
break;
case GST_STATE_PLAYING_TO_PAUSED:
g_get_current_time(&time);
v4l2src->substract_time = GST_TIMEVAL_TO_TIME(time) -
v4l2src->substract_time;
/* de-queue all queued buffers */
if (!gst_v4l2src_capture_stop(v4l2src))
return GST_STATE_FAILURE;
@ -839,6 +1009,14 @@ gst_v4l2src_change_state (GstElement *element)
}
static void
gst_v4l2src_set_clock (GstElement *element,
GstClock *clock)
{
GST_V4L2SRC(element)->clock = clock;
}
static GstBuffer*
gst_v4l2src_buffer_new (GstBufferPool *pool,
guint64 offset,
@ -877,7 +1055,10 @@ gst_v4l2src_buffer_free (GstBufferPool *pool,
for (n=0;n<v4l2src->breq.count;n++)
if (GST_BUFFER_DATA(buf) == GST_V4L2ELEMENT(v4l2src)->buffer[n]) {
gst_v4l2src_requeue_frame(v4l2src, n);
v4l2src->use_num_times[n]--;
if (v4l2src->use_num_times[n] <= 0) {
gst_v4l2src_requeue_frame(v4l2src, n);
}
break;
}

25
sys/v4l2/gstv4l2src.h
View file

@ -51,7 +51,24 @@ struct _GstV4l2Src {
struct v4l2_buffer bufsettings;
struct v4l2_requestbuffers breq;
struct v4l2_format format;
guint64 first_timestamp;
/* A/V sync... frame counter and internal cache */
gulong handled;
gint last_frame;
gint need_writes;
gulong last_seq;
/* clock */
GstClock *clock;
/* time to substract from clock time to get back to timestamp */
GstClockTime substract_time;
/* how often are we going to use each frame? */
gint *use_num_times;
/* how are we going to push buffers? */
gboolean use_fixed_fps;
/* bufferpool for the buffers we're gonna use */
GstBufferPool *bufferpool;
@ -64,6 +81,12 @@ struct _GstV4l2Src {
struct _GstV4l2SrcClass {
GstV4l2ElementClass parent_class;
void (*frame_capture) (GObject *object);
void (*frame_drop) (GObject *object);
void (*frame_insert) (GObject *object);
void (*frame_lost) (GObject *object,
gint num_lost);
};

10
sys/v4l2/v4l2src_calls.c
View file

@ -255,6 +255,14 @@ gst_v4l2src_capture_init (GstV4l2Src *v4l2src)
gst_info("Got %d buffers (%s) of size %d KB\n",
v4l2src->breq.count, desc, v4l2src->format.fmt.pix.sizeimage/1024);
v4l2src->use_num_times = (gint *) malloc(sizeof(gint) * v4l2src->breq.count);
if (!v4l2src->use_num_times) {
gst_element_error(GST_ELEMENT(v4l2src),
"Error creating sync-use-time tracker: %s",
g_strerror(errno));
return FALSE;
}
/* Map the buffers */
GST_V4L2ELEMENT(v4l2src)->buffer = (guint8 **) g_malloc(sizeof(guint8*) * v4l2src->breq.count);
for (n=0;n<v4l2src->breq.count;n++) {
@ -401,5 +409,7 @@ gst_v4l2src_capture_deinit (GstV4l2Src *v4l2src)
g_free(GST_V4L2ELEMENT(v4l2src)->buffer);
GST_V4L2ELEMENT(v4l2src)->buffer = NULL;
free(v4l2src->use_num_times);
return TRUE;
}