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sys/v4l2/gstv4l2src.c (gst_v4l2src_start, gst_v4l2src_stop): Add some useless comments.

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Original commit message from CVS:
2007-06-05  Andy Wingo  <wingo@pobox.com>

* sys/v4l2/gstv4l2src.c (gst_v4l2src_start, gst_v4l2src_stop): Add
some useless comments.

* sys/v4l2/v4l2src_calls.c (gst_v4l2src_capture_init): Don't queue
frames before calling STREAMON, that might leave them in a state
where they can't be dequeued if we go back to NULL without calling
STREAMON, according to the docs.
(gst_v4l2src_capture_start): Enqueue buffers here instead, right
before we call STREAMON.
(gst_v4l2src_capture_deinit): Remove crack to work around dequeue
failures. (For me this code hung.) The pool refcounting is still
crack; added a note to that effect.
This commit is contained in:
Andy Wingo 2007-06-05 14:17:25 +00:00
parent 46ae6f904f
commit e99b73973b
3 changed files with 36 additions and 47 deletions
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15
ChangeLog
View file

@ -1,3 +1,18 @@
2007-06-05 Andy Wingo <wingo@pobox.com>
* sys/v4l2/gstv4l2src.c (gst_v4l2src_start, gst_v4l2src_stop): Add
some useless comments.
* sys/v4l2/v4l2src_calls.c (gst_v4l2src_capture_init): Don't queue
frames before calling STREAMON, that might leave them in a state
where they can't be dequeued if we go back to NULL without calling
STREAMON, according to the docs.
(gst_v4l2src_capture_start): Enqueue buffers here instead, right
before we call STREAMON.
(gst_v4l2src_capture_deinit): Remove crack to work around dequeue
failures. (For me this code hung.) The pool refcounting is still
crack; added a note to that effect.
2007-06-05 Wim Taymans <wim@fluendo.com>
* gst/multipart/multipartmux.c: (gst_multipart_mux_class_init),

2
sys/v4l2/gstv4l2src.c
View file

@ -835,6 +835,7 @@ gst_v4l2src_start (GstBaseSrc * src)
{
GstV4l2Src *v4l2src = GST_V4L2SRC (src);
/* open the device */
if (!gst_v4l2_object_start (v4l2src->v4l2object))
return FALSE;
@ -857,6 +858,7 @@ gst_v4l2src_stop (GstBaseSrc * src)
return FALSE;
}
/* close the device */
if (!gst_v4l2_object_stop (v4l2src->v4l2object))
return FALSE;

66
sys/v4l2/v4l2src_calls.c
View file

@ -629,7 +629,6 @@ gboolean
gst_v4l2src_capture_init (GstV4l2Src * v4l2src)
{
gint n;
GstV4l2Buffer *buffer;
gint fd = v4l2src->v4l2object->video_fd;
struct v4l2_requestbuffers breq;
@ -669,7 +668,7 @@ gst_v4l2src_capture_init (GstV4l2Src * v4l2src)
v4l2src->pool->buffers = g_new0 (GstV4l2Buffer, v4l2src->num_buffers);
for (n = 0; n < v4l2src->num_buffers; n++) {
buffer = &v4l2src->pool->buffers[n];
GstV4l2Buffer *buffer = &v4l2src->pool->buffers[n];
gst_atomic_int_set (&buffer->refcount, 1);
buffer->pool = v4l2src->pool;
@ -688,8 +687,6 @@ gst_v4l2src_capture_init (GstV4l2Src * v4l2src)
goto mmap_failed;
buffer->length = buffer->buffer.length;
if (!gst_v4l2src_queue_frame (v4l2src, n))
goto queue_failed;
}
GST_INFO_OBJECT (v4l2src, "capturing buffers via mmap()");
@ -741,17 +738,6 @@ mmap_failed:
v4l2src->v4l2object->videodev),
("mmap failed: %s", g_strerror (errno)));
gst_v4l2src_capture_deinit (v4l2src);
/* CHECKME: buffer->start = 0; */
return FALSE;
}
queue_failed:
{
GST_ELEMENT_ERROR (v4l2src, RESOURCE, READ,
(_("Could not enqueue buffers in device '%s'."),
v4l2src->v4l2object->videodev),
("enqueing buffer %d/%d failed: %s",
n, v4l2src->num_buffers, g_strerror (errno)));
gst_v4l2src_capture_deinit (v4l2src);
return FALSE;
}
no_supported_capture_method:
@ -773,6 +759,8 @@ gboolean
gst_v4l2src_capture_start (GstV4l2Src * v4l2src)
{
gint type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
gint n;
gint fd = v4l2src->v4l2object->video_fd;
GST_DEBUG_OBJECT (v4l2src, "starting the capturing");
//GST_V4L2_CHECK_OPEN (v4l2src->v4l2object);
@ -781,7 +769,11 @@ gst_v4l2src_capture_start (GstV4l2Src * v4l2src)
v4l2src->quit = FALSE;
if (v4l2src->use_mmap) {
if (ioctl (v4l2src->v4l2object->video_fd, VIDIOC_STREAMON, &type) < 0)
for (n = 0; n < v4l2src->num_buffers; n++)
if (!gst_v4l2src_queue_frame (v4l2src, n))
goto queue_failed;
if (ioctl (fd, VIDIOC_STREAMON, &type) < 0)
goto streamon_failed;
}
@ -790,6 +782,15 @@ gst_v4l2src_capture_start (GstV4l2Src * v4l2src)
return TRUE;
/* ERRORS */
queue_failed:
{
GST_ELEMENT_ERROR (v4l2src, RESOURCE, READ,
(_("Could not enqueue buffers in device '%s'."),
v4l2src->v4l2object->videodev),
("enqueing buffer %d/%d failed: %s",
n, v4l2src->num_buffers, g_strerror (errno)));
return FALSE;
}
streamon_failed:
{
GST_ELEMENT_ERROR (v4l2src, RESOURCE, OPEN_READ,
@ -867,9 +868,6 @@ gst_v4l2src_buffer_pool_free (GstV4l2BufferPool * pool, gboolean do_close)
gboolean
gst_v4l2src_capture_deinit (GstV4l2Src * v4l2src)
{
gint i;
gboolean try_reinit = FALSE;
GST_DEBUG_OBJECT (v4l2src, "deinitting capture system");
if (!GST_V4L2_IS_OPEN (v4l2src->v4l2object)) {
@ -880,38 +878,12 @@ gst_v4l2src_capture_deinit (GstV4l2Src * v4l2src)
}
if (v4l2src->pool) {
/* free the buffers */
for (i = 0; i < v4l2src->num_buffers; i++) {
if (g_atomic_int_dec_and_test (&v4l2src->pool->buffers[i].refcount)) {
if (ioctl (v4l2src->v4l2object->video_fd, VIDIOC_DQBUF,
&v4l2src->pool->buffers[i].buffer) < 0) {
GST_DEBUG_OBJECT (v4l2src,
"Could not dequeue buffer on uninitialization."
"system error: %s. Will try reinit instead", g_strerror (errno));
try_reinit = TRUE;
}
}
}
if (g_atomic_int_dec_and_test (&v4l2src->pool->refcount)) {
/* we're last thing that used all this */
/* FIXME: this is crack, should either use user pointer io method or some
strategy similar to what filesrc uses with automatic freeing */
gst_v4l2src_buffer_pool_free (v4l2src->pool, FALSE);
}
v4l2src->pool = NULL;
/* This is our second try to get the buffers dequeued.
* Since buffers are normally dequeued automatically when capturing is
* stopped, but may be enqueued before capturing has started, you get
* a problem when you abort before capturing started but have enqueued
* the buffers. We avoid that by starting/stopping capturing once so
* they get auto-dequeued.
*/
if (try_reinit) {
gst_v4l2src_capture_start (v4l2src);
if (!gst_v4l2src_capture_stop (v4l2src)) {
/* stop throws an element-error on failure */
GST_WARNING_OBJECT (v4l2src, "failed reinit device");
return FALSE;
}
}
}
GST_V4L2_SET_INACTIVE (v4l2src->v4l2object);