yair/gst-plugin-linescan
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

niimaqsrc: another attempt at robust date-timestamping

Browse Source 
Before indices would get out of sync. Try mutexes now.
This commit is contained in:
Joshua M. Doe 2012-07-11 02:37:22 -04:00
parent 5e8744d492
commit 1033aea633
2 changed files with 37 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
sys/niimaq/gstniimaq.c
View File

@ -146,9 +146,17 @@ gst_niimaqsrc_frame_start_callback (SESSION_ID sid, IMG_ERR err,
GstClockTime abstime;
static guint32 index = 0;
g_mutex_lock (niimaqsrc->mutex);
/* time hasn't been read yet, this frame will be dropped */
if (niimaqsrc->times[index] != GST_CLOCK_TIME_NONE) {
g_mutex_unlock (niimaqsrc->mutex);
return 1;
}
/* get clock time */
abstime = gst_clock_get_time (GST_ELEMENT_CLOCK (niimaqsrc));
niimaqsrc->times[index % niimaqsrc->bufsize] = abstime;
niimaqsrc->times[index] = abstime;
if (G_UNLIKELY (niimaqsrc->start_time == NULL))
niimaqsrc->start_time = gst_date_time_new_now_utc ();
@ -157,7 +165,9 @@ gst_niimaqsrc_frame_start_callback (SESSION_ID sid, IMG_ERR err,
if (niimaqsrc->base_time == GST_CLOCK_TIME_NONE)
niimaqsrc->base_time = abstime;
index++;
index = (index + 1) % niimaqsrc->bufsize;
g_mutex_unlock (niimaqsrc->mutex);
/* return 1 to rearm the callback */
return 1;
@ -502,6 +512,8 @@ gst_niimaqsrc_init (GstNiImaqSrc * niimaqsrc, GstNiImaqSrcClass * g_class)
/* override default of BYTES to operate in time mode */
gst_base_src_set_format (GST_BASE_SRC (niimaqsrc), GST_FORMAT_TIME);
niimaqsrc->mutex = g_mutex_new ();
/* initialize properties */
niimaqsrc->bufsize = DEFAULT_PROP_BUFSIZE;
niimaqsrc->interface_name = g_strdup (DEFAULT_PROP_INTERFACE);
@ -755,7 +767,20 @@ gst_niimaqsrc_create (GstPushSrc * psrc, GstBuffer ** buffer)
}
}
//{
// guint32 *data;
// int i;
// rval = imgSessionExamineBuffer2 (niimaqsrc->sid, niimaqsrc->cumbufnum, &copied_number, &data);
// for (i=0; i<niimaqsrc->bufsize;i++)
// if (data == niimaqsrc->buflist[i])
// break;
// timestamp = niimaqsrc->times[i];
// memcpy (GST_BUFFER_DATA (*buffer), data, niimaqsrc->framesize);
// niimaqsrc->times[i] = GST_CLOCK_TIME_NONE;
// imgSessionReleaseBuffer (niimaqsrc->sid); //TODO: mutex here?
//}
if (no_copy) {
/* FIXME: with callback change, is this broken now? mutex... */
rval =
imgSessionExamineBuffer2 (niimaqsrc->sid, niimaqsrc->cumbufnum,
&copied_number, &GST_BUFFER_DATA (*buffer));
@ -764,15 +789,23 @@ gst_niimaqsrc_create (GstPushSrc * psrc, GstBuffer ** buffer)
} else if (niimaqsrc->width == niimaqsrc->rowpixels) {
/* TODO: optionally use ExamineBuffer and byteswap in transfer (to offer BIG_ENDIAN) */
guint8 *data = GST_BUFFER_DATA (*buffer);
g_mutex_lock (niimaqsrc->mutex);
rval =
imgSessionCopyBufferByNumber (niimaqsrc->sid, niimaqsrc->cumbufnum,
data, IMG_OVERWRITE_GET_OLDEST, &copied_number, &copied_index);
timestamp = niimaqsrc->times[copied_index];
niimaqsrc->times[copied_index] = GST_CLOCK_TIME_NONE;
g_mutex_unlock (niimaqsrc->mutex);
} else {
guint8 *data = GST_BUFFER_DATA (*buffer);
g_mutex_lock (niimaqsrc->mutex);
rval =
imgSessionCopyAreaByNumber (niimaqsrc->sid, niimaqsrc->cumbufnum, 0, 0,
niimaqsrc->height, niimaqsrc->width, data, niimaqsrc->rowpixels,
IMG_OVERWRITE_GET_OLDEST, &copied_number, &copied_index);
timestamp = niimaqsrc->times[copied_index];
niimaqsrc->times[copied_index] = GST_CLOCK_TIME_NONE;
g_mutex_unlock (niimaqsrc->mutex);
}
if (rval) {
@ -783,12 +816,6 @@ gst_niimaqsrc_create (GstPushSrc * psrc, GstBuffer ** buffer)
goto error;
}
GST_DEBUG_OBJECT (niimaqsrc, "Associating time with buffer");
/* set timestamp */
timestamp =
gst_niimaqsrc_get_timestamp_from_buffer_number (niimaqsrc, copied_number);
/* make guess of duration from timestamp and cumulative buffer number */
if (GST_CLOCK_TIME_IS_VALID (timestamp)) {
duration = timestamp / (copied_number + 1);

2
sys/niimaq/gstniimaq.h
View File

@ -75,6 +75,8 @@ struct _GstNiImaqSrc {
GstDateTime *start_time;
gboolean start_time_sent;
GMutex *mutex;
};
struct _GstNiImaqSrcClass {