static GstFlowReturn
gst_mio_video_src_create (GstPushSrc * pushsrc, GstBuffer ** buf)
{
GstMIOVideoSrc *self = GST_MIO_VIDEO_SRC_CAST (pushsrc);
GstCMApi *cm = self->ctx->cm;
CMFormatDescriptionRef format;
FRAME_QUEUE_LOCK (self);
while (self->running && g_queue_is_empty (self->queue))
FRAME_QUEUE_WAIT (self);
*buf = g_queue_pop_tail (self->queue);
FRAME_QUEUE_UNLOCK (self);
if (G_UNLIKELY (!self->running))
goto shutting_down;
format = cm->CMSampleBufferGetFormatDescription
(GST_CORE_MEDIA_BUFFER (*buf)->sample_buf);
if (self->prev_format != NULL &&
!cm->CMFormatDescriptionEqual (format, self->prev_format)) {
goto unexpected_format;
}
cm->FigFormatDescriptionRelease (self->prev_format);
self->prev_format = cm->FigFormatDescriptionRetain (format);
if (self->prev_offset == GST_BUFFER_OFFSET_NONE ||
GST_BUFFER_OFFSET (*buf) - self->prev_offset != 1) {
GST_BUFFER_FLAG_SET (*buf, GST_BUFFER_FLAG_DISCONT);
}
self->prev_offset = GST_BUFFER_OFFSET (*buf);
return GST_FLOW_OK;
/* ERRORS */
shutting_down:
{
if (*buf != NULL) {
gst_buffer_unref (*buf);
*buf = NULL;
}
return GST_FLOW_FLUSHING;
}
unexpected_format:
{
GST_ELEMENT_ERROR (self, RESOURCE, READ,
("capture format changed unexpectedly"),
("another application likely reconfigured the device"));
if (*buf != NULL) {
gst_buffer_unref (*buf);
*buf = NULL;
}
return GST_FLOW_ERROR;
}
}
static gboolean
gst_vtenc_negotiate_downstream (GstVTEnc * self, CMSampleBufferRef sbuf)
{
gboolean result;
GstCMApi *cm = self->ctx->cm;
GstCaps *caps;
GstStructure *s;
if (self->caps_width == self->negotiated_width &&
self->caps_height == self->negotiated_height &&
self->caps_fps_n == self->negotiated_fps_n &&
self->caps_fps_d == self->negotiated_fps_d) {
return TRUE;
}
caps = gst_caps_copy (gst_pad_get_pad_template_caps (self->srcpad));
s = gst_caps_get_structure (caps, 0);
gst_structure_set (s,
"width", G_TYPE_INT, self->negotiated_width,
"height", G_TYPE_INT, self->negotiated_height,
"framerate", GST_TYPE_FRACTION,
self->negotiated_fps_n, self->negotiated_fps_d, NULL);
if (self->details->format_id == kVTFormatH264) {
CMFormatDescriptionRef fmt;
CFDictionaryRef atoms;
CFStringRef avccKey;
CFDataRef avcc;
GstBuffer *codec_data;
fmt = cm->CMSampleBufferGetFormatDescription (sbuf);
atoms = cm->CMFormatDescriptionGetExtension (fmt,
*(cm->kCMFormatDescriptionExtension_SampleDescriptionExtensionAtoms));
avccKey = CFStringCreateWithCString (NULL, "avcC", kCFStringEncodingUTF8);
avcc = CFDictionaryGetValue (atoms, avccKey);
CFRelease (avccKey);
codec_data = gst_buffer_new_and_alloc (CFDataGetLength (avcc));
CFDataGetBytes (avcc, CFRangeMake (0, CFDataGetLength (avcc)),
GST_BUFFER_DATA (codec_data));
gst_structure_set (s, "codec_data", GST_TYPE_BUFFER, codec_data, NULL);
gst_buffer_unref (codec_data);
}
result = gst_pad_set_caps (self->srcpad, caps);
gst_caps_unref (caps);
self->caps_width = self->negotiated_width;
self->caps_height = self->negotiated_height;
self->caps_fps_n = self->negotiated_fps_n;
self->caps_fps_d = self->negotiated_fps_d;
return result;
}
