static void
gst_rtp_vp8_depay_dispose (GObject * object)
{
GstRtpVP8Depay *self = GST_RTP_VP8_DEPAY (object);
if (self->adapter != NULL)
g_object_unref (self->adapter);
self->adapter = NULL;
/* release any references held by the object here */
if (G_OBJECT_CLASS (gst_rtp_vp8_depay_parent_class)->dispose)
G_OBJECT_CLASS (gst_rtp_vp8_depay_parent_class)->dispose (object);
}
static gboolean
gst_rtp_vp8_depay_handle_event (GstRTPBaseDepayload * depay, GstEvent * event)
{
GstRtpVP8Depay *self = GST_RTP_VP8_DEPAY (depay);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_STOP:
self->last_profile = -1;
self->last_height = -1;
self->last_width = -1;
break;
default:
break;
}
return
GST_RTP_BASE_DEPAYLOAD_CLASS
(gst_rtp_vp8_depay_parent_class)->handle_event (depay, event);
}
static GstStateChangeReturn
gst_rtp_vp8_depay_change_state (GstElement * element, GstStateChange transition)
{
GstRtpVP8Depay *self = GST_RTP_VP8_DEPAY (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
self->last_profile = -1;
self->last_height = -1;
self->last_width = -1;
self->caps_sent = FALSE;
break;
default:
break;
}
return
GST_ELEMENT_CLASS (gst_rtp_vp8_depay_parent_class)->change_state (element,
transition);
}
static GstBuffer *
gst_rtp_vp8_depay_process (GstRTPBaseDepayload * depay, GstBuffer * buf)
{
GstRtpVP8Depay *self = GST_RTP_VP8_DEPAY (depay);
GstBuffer *payload;
guint8 *data;
guint hdrsize;
guint size;
GstRTPBuffer rtpbuffer = GST_RTP_BUFFER_INIT;
if (G_UNLIKELY (GST_BUFFER_IS_DISCONT (buf))) {
GST_LOG_OBJECT (self, "Discontinuity, flushing adapter");
gst_adapter_clear (self->adapter);
self->started = FALSE;
}
gst_rtp_buffer_map (buf, GST_MAP_READ, &rtpbuffer);
size = gst_rtp_buffer_get_payload_len (&rtpbuffer);
/* At least one header and one vp8 byte */
if (G_UNLIKELY (size < 2))
goto too_small;
data = gst_rtp_buffer_get_payload (&rtpbuffer);
if (G_UNLIKELY (!self->started)) {
/* Check if this is the start of a VP8 frame, otherwise bail */
/* S=1 and PartID= 0 */
if ((data[0] & 0x1F) != 0x10)
goto done;
self->started = TRUE;
}
hdrsize = 1;
/* Check X optional header */
if ((data[0] & 0x80) != 0) {
hdrsize++;
/* Check I optional header */
if ((data[1] & 0x80) != 0) {
if (G_UNLIKELY (size < 3))
goto too_small;
hdrsize++;
/* Check for 16 bits PictureID */
if ((data[2] & 0x80) != 0)
hdrsize++;
}
/* Check L optional header */
if ((data[1] & 0x40) != 0)
hdrsize++;
/* Check T or K optional headers */
if ((data[1] & 0x20) != 0 || (data[1] & 0x10) != 0)
hdrsize++;
}
GST_DEBUG_OBJECT (depay, "hdrsize %u, size %u", hdrsize, size);
if (G_UNLIKELY (hdrsize >= size))
goto too_small;
payload = gst_rtp_buffer_get_payload_subbuffer (&rtpbuffer, hdrsize, -1);
gst_adapter_push (self->adapter, payload);
/* Marker indicates that it was the last rtp packet for this frame */
if (gst_rtp_buffer_get_marker (&rtpbuffer)) {
GstBuffer *out;
guint8 flag0;
gst_adapter_copy (self->adapter, &flag0, 0, 1);
out = gst_adapter_take_buffer (self->adapter,
gst_adapter_available (self->adapter));
self->started = FALSE;
gst_rtp_buffer_unmap (&rtpbuffer);
/* mark keyframes */
out = gst_buffer_make_writable (out);
if ((flag0 & 0x01))
GST_BUFFER_FLAG_SET (out, GST_BUFFER_FLAG_DELTA_UNIT);
else
GST_BUFFER_FLAG_UNSET (out, GST_BUFFER_FLAG_DELTA_UNIT);
return out;
}
done:
gst_rtp_buffer_unmap (&rtpbuffer);
return NULL;
too_small:
GST_LOG_OBJECT (self, "Invalid rtp packet (too small), ignoring");
gst_adapter_clear (self->adapter);
self->started = FALSE;
goto done;
}
static GstBuffer *
gst_rtp_vp8_depay_process (GstRTPBaseDepayload * depay, GstRTPBuffer * rtp)
{
GstRtpVP8Depay *self = GST_RTP_VP8_DEPAY (depay);
GstBuffer *payload;
guint8 *data;
guint hdrsize;
guint size;
if (G_UNLIKELY (GST_BUFFER_IS_DISCONT (rtp->buffer))) {
GST_LOG_OBJECT (self, "Discontinuity, flushing adapter");
gst_adapter_clear (self->adapter);
self->started = FALSE;
}
size = gst_rtp_buffer_get_payload_len (rtp);
/* At least one header and one vp8 byte */
if (G_UNLIKELY (size < 2))
goto too_small;
data = gst_rtp_buffer_get_payload (rtp);
if (G_UNLIKELY (!self->started)) {
/* Check if this is the start of a VP8 frame, otherwise bail */
/* S=1 and PartID= 0 */
if ((data[0] & 0x17) != 0x10)
goto done;
self->started = TRUE;
}
hdrsize = 1;
/* Check X optional header */
if ((data[0] & 0x80) != 0) {
hdrsize++;
/* Check I optional header */
if ((data[1] & 0x80) != 0) {
if (G_UNLIKELY (size < 3))
goto too_small;
hdrsize++;
/* Check for 16 bits PictureID */
if ((data[2] & 0x80) != 0)
hdrsize++;
}
/* Check L optional header */
if ((data[1] & 0x40) != 0)
hdrsize++;
/* Check T or K optional headers */
if ((data[1] & 0x20) != 0 || (data[1] & 0x10) != 0)
hdrsize++;
}
GST_DEBUG_OBJECT (depay, "hdrsize %u, size %u", hdrsize, size);
if (G_UNLIKELY (hdrsize >= size))
goto too_small;
payload = gst_rtp_buffer_get_payload_subbuffer (rtp, hdrsize, -1);
gst_adapter_push (self->adapter, payload);
/* Marker indicates that it was the last rtp packet for this frame */
if (gst_rtp_buffer_get_marker (rtp)) {
GstBuffer *out;
guint8 header[10];
gst_adapter_copy (self->adapter, &header, 0, 10);
out = gst_adapter_take_buffer (self->adapter,
gst_adapter_available (self->adapter));
self->started = FALSE;
/* mark keyframes */
out = gst_buffer_make_writable (out);
if ((header[0] & 0x01)) {
GST_BUFFER_FLAG_SET (out, GST_BUFFER_FLAG_DELTA_UNIT);
if (!self->caps_sent) {
gst_buffer_unref (out);
out = NULL;
GST_INFO_OBJECT (self, "Dropping inter-frame before intra-frame");
gst_pad_push_event (GST_RTP_BASE_DEPAYLOAD_SINKPAD (depay),
gst_video_event_new_upstream_force_key_unit (GST_CLOCK_TIME_NONE,
TRUE, 0));
}
} else {
guint profile, width, height;
GST_BUFFER_FLAG_UNSET (out, GST_BUFFER_FLAG_DELTA_UNIT);
profile = (header[0] & 0x0e) >> 1;
width = GST_READ_UINT16_LE (header + 6) & 0x3fff;
height = GST_READ_UINT16_LE (header + 8) & 0x3fff;
if (G_UNLIKELY (self->last_width != width ||
self->last_height != height || self->last_profile != profile)) {
gchar profile_str[3];
GstCaps *srccaps;
snprintf (profile_str, 3, "%u", profile);
srccaps = gst_caps_new_simple ("video/x-vp8",
"framerate", GST_TYPE_FRACTION, 0, 1,
"height", G_TYPE_INT, height,
"width", G_TYPE_INT, width,
"profile", G_TYPE_STRING, profile_str, NULL);
gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depay), srccaps);
gst_caps_unref (srccaps);
self->caps_sent = TRUE;
self->last_width = width;
self->last_height = height;
self->last_profile = profile;
}
}
return out;
}
done:
return NULL;
too_small:
GST_LOG_OBJECT (self, "Invalid rtp packet (too small), ignoring");
gst_adapter_clear (self->adapter);
self->started = FALSE;
goto done;
}
static GstBuffer *
gst_rtp_vp8_depay_process (GstBaseRTPDepayload * depay, GstBuffer * buf)
{
GstRtpVP8Depay *self = GST_RTP_VP8_DEPAY (depay);
GstBuffer *payload;
guint8 *data;
guint offset;
guint size = gst_rtp_buffer_get_payload_len (buf);
if (G_UNLIKELY (GST_BUFFER_IS_DISCONT (buf))) {
GST_LOG_OBJECT (self, "Discontinuity, flushing adapter");
gst_adapter_clear (self->adapter);
self->started = FALSE;
}
/* At least one header and one vp8 byte */
if (G_UNLIKELY (size < 2))
goto too_small;
data = gst_rtp_buffer_get_payload (buf);
if (G_UNLIKELY (!self->started)) {
/* Check if this is the start of a VP8 frame, otherwise bail */
if ((data[0] & 0x1) == 0)
return NULL;
self->started = TRUE;
}
offset = 1;
if ((data[0] & 0x10) != 0) {
/* Skip Picture identifier bytes */
for (; (data[offset] & 0x80) != 0; offset++) {
/* should be at least one more pictureID byte and at least one byte in
* the vp8 payload */
if (G_UNLIKELY (offset + 2 >= size))
goto too_small;
}
offset++;
}
if (G_UNLIKELY (offset >= size))
goto too_small;
payload = gst_rtp_buffer_get_payload_subbuffer (buf, offset, -1);
gst_adapter_push (self->adapter, payload);
/* Marker indicates that it was the last rtp packet for this frame */
if (gst_rtp_buffer_get_marker (buf)) {
GstBuffer *out;
out = gst_adapter_take_buffer (self->adapter,
gst_adapter_available (self->adapter));
self->started = FALSE;
return out;
}
return NULL;
too_small:
GST_LOG_OBJECT (self, "Invalid rtp packet (too small), ignoring");
gst_adapter_clear (self->adapter);
self->started = FALSE;
return NULL;
}
