static gboolean
gst_ks_video_src_start_worker (GstKsVideoSrc * self)
{
GstKsVideoSrcPrivate *priv = GST_KS_VIDEO_SRC_GET_PRIVATE (self);
gboolean result;
priv->worker_lock = g_mutex_new ();
priv->worker_notify_cond = g_cond_new ();
priv->worker_result_cond = g_cond_new ();
priv->worker_pending_caps = NULL;
priv->worker_pending_run = FALSE;
priv->worker_state = KS_WORKER_STATE_STARTING;
priv->worker_thread =
g_thread_create (gst_ks_video_src_worker_func, self, TRUE, NULL);
KS_WORKER_LOCK (priv);
while (priv->worker_state < KS_WORKER_STATE_READY)
KS_WORKER_WAIT_FOR_RESULT (priv);
result = priv->worker_state == KS_WORKER_STATE_READY;
KS_WORKER_UNLOCK (priv);
return result;
}
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;
KS_WORKER_LOCK (priv);
priv->worker_pending_caps = caps;
KS_WORKER_NOTIFY (priv);
while (priv->worker_pending_caps == caps)
KS_WORKER_WAIT_FOR_RESULT (priv);
KS_WORKER_UNLOCK (priv);
return priv->worker_setcaps_result;
}
static GstFlowReturn
gst_ks_video_src_create (GstPushSrc * pushsrc, GstBuffer ** buf)
{
GstKsVideoSrc *self = GST_KS_VIDEO_SRC (pushsrc);
GstKsVideoSrcPrivate *priv = GST_KS_VIDEO_SRC_GET_PRIVATE (self);
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;
if (G_UNLIKELY (!priv->running)) {
KS_WORKER_LOCK (priv);
priv->worker_pending_run = TRUE;
KS_WORKER_NOTIFY (priv);
while (priv->worker_pending_run)
KS_WORKER_WAIT_FOR_RESULT (priv);
priv->running = priv->worker_run_result;
error_code = priv->worker_error_code;
KS_WORKER_UNLOCK (priv);
if (!priv->running)
goto error_start_capture;
}
do {
if (*buf != NULL) {
gst_buffer_unref (*buf);
*buf = NULL;
}
result = gst_ks_video_device_read_frame (priv->device, buf,
&presentation_time, &error_code, &error_str);
if (G_UNLIKELY (result != GST_FLOW_OK))
goto error_read_frame;
}
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));
return GST_FLOW_OK;
/* ERRORS */
error_no_caps:
{
GST_ELEMENT_ERROR (self, CORE, NEGOTIATION,
("not negotiated"), ("maybe setcaps failed?"));
return GST_FLOW_ERROR;
}
error_start_capture:
{
const gchar *debug_str = "failed to change pin state to KSSTATE_RUN";
switch (error_code) {
case ERROR_FILE_NOT_FOUND:
GST_ELEMENT_ERROR (self, RESOURCE, NOT_FOUND,
("failed to start capture (device unplugged)"), (debug_str));
break;
case ERROR_NO_SYSTEM_RESOURCES:
GST_ELEMENT_ERROR (self, RESOURCE, BUSY,
("failed to start capture (device already in use)"), (debug_str));
break;
default:
GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
("failed to start capture (0x%08x)", error_code), (debug_str));
break;
}
return GST_FLOW_ERROR;
}
error_read_frame:
{
if (result == GST_FLOW_ERROR) {
if (error_str != NULL) {
GST_ELEMENT_ERROR (self, RESOURCE, READ,
("read failed: %s [0x%08x]", error_str, error_code),
("gst_ks_video_device_read_frame failed"));
}
} else if (result == GST_FLOW_UNEXPECTED) {
GST_ELEMENT_ERROR (self, RESOURCE, READ,
("read failed"), ("gst_ks_video_device_read_frame failed"));
}
g_free (error_str);
return result;
}
}
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;
if (G_UNLIKELY (!priv->running)) {
KS_WORKER_LOCK (priv);
priv->worker_pending_run = TRUE;
KS_WORKER_NOTIFY (priv);
while (priv->worker_pending_run)
KS_WORKER_WAIT_FOR_RESULT (priv);
priv->running = priv->worker_run_result;
KS_WORKER_UNLOCK (priv);
if (!priv->running)
goto error_start_capture;
}
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_start_capture:
{
GST_ELEMENT_ERROR (self, RESOURCE, OPEN_READ,
("could not start capture"),
("failed to change pin state to KSSTATE_RUN"));
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;
}
}
