static GstFlowReturn
gst_rtp_ssrc_demux_chain (GstPad * pad, GstBuffer * buf)
{
GstFlowReturn ret;
GstRtpSsrcDemux *demux;
guint32 ssrc;
GstRtpSsrcDemuxPad *dpad;
demux = GST_RTP_SSRC_DEMUX (GST_OBJECT_PARENT (pad));
if (!gst_rtp_buffer_validate (buf))
goto invalid_payload;
ssrc = gst_rtp_buffer_get_ssrc (buf);
GST_DEBUG_OBJECT (demux, "received buffer of SSRC %08x", ssrc);
GST_PAD_LOCK (demux);
dpad = find_demux_pad_for_ssrc (demux, ssrc);
if (dpad == NULL) {
if (!(dpad =
create_demux_pad_for_ssrc (demux, ssrc,
GST_BUFFER_TIMESTAMP (buf))))
goto create_failed;
}
GST_PAD_UNLOCK (demux);
/* push to srcpad */
ret = gst_pad_push (dpad->rtp_pad, buf);
return ret;
/* ERRORS */
invalid_payload:
{
/* this is fatal and should be filtered earlier */
GST_ELEMENT_ERROR (demux, STREAM, DECODE, (NULL),
("Dropping invalid RTP payload"));
gst_buffer_unref (buf);
return GST_FLOW_ERROR;
}
create_failed:
{
GST_ELEMENT_ERROR (demux, STREAM, DECODE, (NULL),
("Could not create new pad"));
GST_PAD_UNLOCK (demux);
gst_buffer_unref (buf);
return GST_FLOW_ERROR;
}
}
static void
compare_rtp_packets (GstBuffer * a, GstBuffer * b)
{
GstRTPBuffer rtp_a = GST_RTP_BUFFER_INIT;
GstRTPBuffer rtp_b = GST_RTP_BUFFER_INIT;
gst_rtp_buffer_map (a, GST_MAP_READ, &rtp_a);
gst_rtp_buffer_map (b, GST_MAP_READ, &rtp_b);
fail_unless_equals_int (gst_rtp_buffer_get_header_len (&rtp_a),
gst_rtp_buffer_get_header_len (&rtp_b));
fail_unless_equals_int (gst_rtp_buffer_get_version (&rtp_a),
gst_rtp_buffer_get_version (&rtp_b));
fail_unless_equals_int (gst_rtp_buffer_get_ssrc (&rtp_a),
gst_rtp_buffer_get_ssrc (&rtp_b));
fail_unless_equals_int (gst_rtp_buffer_get_seq (&rtp_a),
gst_rtp_buffer_get_seq (&rtp_b));
fail_unless_equals_int (gst_rtp_buffer_get_csrc_count (&rtp_a),
gst_rtp_buffer_get_csrc_count (&rtp_b));
fail_unless_equals_int (gst_rtp_buffer_get_marker (&rtp_a),
gst_rtp_buffer_get_marker (&rtp_b));
fail_unless_equals_int (gst_rtp_buffer_get_payload_type (&rtp_a),
gst_rtp_buffer_get_payload_type (&rtp_b));
fail_unless_equals_int (gst_rtp_buffer_get_timestamp (&rtp_a),
gst_rtp_buffer_get_timestamp (&rtp_b));
fail_unless_equals_int (gst_rtp_buffer_get_extension (&rtp_a),
gst_rtp_buffer_get_extension (&rtp_b));
fail_unless_equals_int (gst_rtp_buffer_get_payload_len (&rtp_a),
gst_rtp_buffer_get_payload_len (&rtp_b));
fail_unless_equals_int (memcmp (gst_rtp_buffer_get_payload (&rtp_a),
gst_rtp_buffer_get_payload (&rtp_b),
gst_rtp_buffer_get_payload_len (&rtp_a)), 0);
gst_rtp_buffer_unmap (&rtp_a);
gst_rtp_buffer_unmap (&rtp_b);
}
static GstFlowReturn gst_scream_queue_sink_chain(GstPad *pad, GstObject *parent, GstBuffer *buffer)
{
GstScreamQueue *self = GST_SCREAM_QUEUE(parent);
GstRTPBuffer rtp_buffer = GST_RTP_BUFFER_INIT;
GstFlowReturn flow_ret = GST_FLOW_OK;
GstScreamDataQueueRtpItem *rtp_item;
if (GST_PAD_IS_FLUSHING(pad)) {
flow_ret = GST_FLOW_FLUSHING;
goto end;
}
if (!gst_rtp_buffer_map(buffer, GST_MAP_READ, &rtp_buffer)) {
flow_ret = GST_FLOW_ERROR;
goto end;
}
rtp_item = g_slice_new(GstScreamDataQueueRtpItem);
((GstDataQueueItem *)rtp_item)->object = GST_MINI_OBJECT(buffer);
((GstDataQueueItem *)rtp_item)->size = gst_buffer_get_size(buffer);
((GstDataQueueItem *)rtp_item)->visible = TRUE;
((GstDataQueueItem *)rtp_item)->duration = GST_BUFFER_DURATION(buffer);
((GstDataQueueItem *)rtp_item)->destroy = (GDestroyNotify) gst_scream_data_queue_rtp_item_free;
((GstScreamDataQueueItem *)rtp_item)->type = GST_SCREAM_DATA_QUEUE_ITEM_TYPE_RTP;
((GstScreamDataQueueItem *)rtp_item)->rtp_ssrc = gst_rtp_buffer_get_ssrc(&rtp_buffer);
rtp_item->rtp_pt = gst_rtp_buffer_get_payload_type(&rtp_buffer);
rtp_item->gst_ts = GST_BUFFER_PTS(buffer);
rtp_item->rtp_seq = gst_rtp_buffer_get_seq(&rtp_buffer);
rtp_item->rtp_ts = gst_rtp_buffer_get_timestamp(&rtp_buffer);
rtp_item->rtp_marker = gst_rtp_buffer_get_marker(&rtp_buffer);
rtp_item->rtp_payload_size = gst_rtp_buffer_get_payload_len(&rtp_buffer);
rtp_item->enqueued_time = get_gst_time_us(self);
gst_rtp_buffer_unmap(&rtp_buffer);
if (self->pass_through) {
rtp_item->adapted = FALSE;
GST_LOG_OBJECT(self, "passing through: pt = %u, seq: %u, pass: %u", rtp_item->rtp_pt, rtp_item->rtp_seq, self->pass_through);
gst_data_queue_push(self->approved_packets, (GstDataQueueItem *)rtp_item);
goto end;
}
GST_LOG_OBJECT(self, "queuing: pt = %u, seq: %u, pass: %u", rtp_item->rtp_pt, rtp_item->rtp_seq, self->pass_through);
g_async_queue_push(self->incoming_packets, (gpointer)rtp_item);
end:
return flow_ret;
}
static GstFlowReturn
gst_rtp_ssrc_demux_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstFlowReturn ret;
GstRtpSsrcDemux *demux;
guint32 ssrc;
GstRTPBuffer rtp = { NULL };
GstPad *srcpad;
demux = GST_RTP_SSRC_DEMUX (parent);
if (!gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp))
goto invalid_payload;
ssrc = gst_rtp_buffer_get_ssrc (&rtp);
gst_rtp_buffer_unmap (&rtp);
GST_DEBUG_OBJECT (demux, "received buffer of SSRC %08x", ssrc);
srcpad = find_or_create_demux_pad_for_ssrc (demux, ssrc, RTP_PAD);
if (srcpad == NULL)
goto create_failed;
/* push to srcpad */
ret = gst_pad_push (srcpad, buf);
gst_object_unref (srcpad);
return ret;
/* ERRORS */
invalid_payload:
{
/* this is fatal and should be filtered earlier */
GST_ELEMENT_ERROR (demux, STREAM, DECODE, (NULL),
("Dropping invalid RTP payload"));
gst_buffer_unref (buf);
return GST_FLOW_ERROR;
}
create_failed:
{
GST_ELEMENT_ERROR (demux, STREAM, DECODE, (NULL),
("Could not create new pad"));
gst_buffer_unref (buf);
return GST_FLOW_ERROR;
}
}
static void
packet_recovered_cb (GObject * internal_storage, GstBuffer * buffer,
GList * infos)
{
gboolean found = FALSE;
GstRTPBuffer rtp = { NULL };
fail_unless (gst_rtp_buffer_map (buffer, GST_MAP_READ, &rtp));
for (GList * it = infos; it; it = it->next) {
RecoveredPacketInfo *info = it->data;
if (gst_rtp_buffer_get_seq (&rtp) == info->seq) {
fail_unless_equals_int (gst_rtp_buffer_get_payload_type (&rtp), info->pt);
fail_unless_equals_int (gst_rtp_buffer_get_ssrc (&rtp), info->ssrc);
found = TRUE;
break;
}
}
gst_rtp_buffer_unmap (&rtp);
fail_unless (found);
}
static void
add_rtp_source_meta (GstBuffer * outbuf, GstBuffer * rtpbuf)
{
GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
GstRTPSourceMeta *meta;
guint32 ssrc;
if (!gst_rtp_buffer_map (rtpbuf, GST_MAP_READ, &rtp))
return;
ssrc = gst_rtp_buffer_get_ssrc (&rtp);
meta = gst_buffer_add_rtp_source_meta (outbuf, &ssrc, NULL, 0);
if (meta != NULL) {
gint csrc_count = gst_rtp_buffer_get_csrc_count (&rtp);
for (gint i = 0; i < csrc_count; i++) {
guint32 csrc = gst_rtp_buffer_get_csrc (&rtp, i);
gst_rtp_source_meta_append_csrc (meta, &csrc, 1);
}
}
gst_rtp_buffer_unmap (&rtp);
}
static void
change_ssrc_handler (GstPad *pad, GstBuffer *buf, gpointer user_data)
{
guint sess_ssrc;
guint buf_ssrc;
ts_fail_unless (gst_rtp_buffer_validate (buf));
buf_ssrc = gst_rtp_buffer_get_ssrc (buf);
g_object_get (dat->session, "ssrc", &sess_ssrc, NULL);
if (buf_ssrc == 12345)
{
/* Step two, set it to 6789 */
ts_fail_unless (buf_ssrc == sess_ssrc || sess_ssrc == 6789);
g_object_set (dat->session, "ssrc", 6789, NULL);
}
else if (buf_ssrc == 6789)
{
/* Step three, quit */
ts_fail_unless (buf_ssrc == sess_ssrc);
g_main_loop_quit (loop);
}
else
{
ts_fail_unless (checked || buf_ssrc == sess_ssrc);
checked = TRUE;
/* Step one, set the ssrc to 12345 */
if (sess_ssrc != 12345)
g_object_set (dat->session, "ssrc", 12345, NULL);
}
}
/* Return a stream structure for a given buffer
*/
static GstSrtpDecSsrcStream *
validate_buffer (GstSrtpDec * filter, GstBuffer * buf, guint32 * ssrc,
gboolean * is_rtcp)
{
GstSrtpDecSsrcStream *stream = NULL;
GstRTPBuffer rtpbuf = GST_RTP_BUFFER_INIT;
if (gst_rtp_buffer_map (buf,
GST_MAP_READ | GST_RTP_BUFFER_MAP_FLAG_SKIP_PADDING, &rtpbuf)) {
if (gst_rtp_buffer_get_payload_type (&rtpbuf) < 64
|| gst_rtp_buffer_get_payload_type (&rtpbuf) > 80) {
*ssrc = gst_rtp_buffer_get_ssrc (&rtpbuf);
gst_rtp_buffer_unmap (&rtpbuf);
*is_rtcp = FALSE;
goto have_ssrc;
}
gst_rtp_buffer_unmap (&rtpbuf);
}
if (rtcp_buffer_get_ssrc (buf, ssrc)) {
*is_rtcp = TRUE;
} else {
GST_WARNING_OBJECT (filter, "No SSRC found in buffer");
return NULL;
}
have_ssrc:
stream = find_stream_by_ssrc (filter, *ssrc);
if (stream)
return stream;
return request_key_with_signal (filter, *ssrc, SIGNAL_REQUEST_KEY);
}
static GstPadProbeReturn
rtpsession_sinkpad_probe (GstPad * pad, GstPadProbeInfo * info,
gpointer user_data)
{
GstPadProbeReturn ret = GST_PAD_PROBE_OK;
if (info->type == (GST_PAD_PROBE_TYPE_BUFFER | GST_PAD_PROBE_TYPE_PUSH)) {
GstBuffer *buffer = GST_BUFFER (info->data);
GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
GstBuffer *rtcp_buffer = 0;
guint ssrc = 0;
/* retrieve current ssrc */
gst_rtp_buffer_map (buffer, GST_MAP_READ, &rtp);
ssrc = gst_rtp_buffer_get_ssrc (&rtp);
gst_rtp_buffer_unmap (&rtp);
/* if not first buffer, check that our ssrc has changed */
if (ssrc_prev != -1 && ssrc != ssrc_prev)
++nb_ssrc_changes;
/* update prev ssrc */
ssrc_prev = ssrc;
/* feint a collision on recv_rtcp_sink pad of gstrtpsession
* (note that after being marked as collied the rtpsession ignores
* all non bye packets)
*/
rtcp_buffer = create_rtcp_app (ssrc, nb_ssrc_changes);
/* push collied packet on recv_rtcp_sink */
gst_pad_push (srcpad, rtcp_buffer);
}
return ret;
}
static void
lock_check_cb (GstPad * pad, int i)
{
GstBuffer *inbuf;
if (i % 2) {
fail_unless (buffers == NULL);
} else {
GstRTPBuffer rtpbuffer = GST_RTP_BUFFER_INIT;
fail_unless (buffers && g_list_length (buffers) == 1);
gst_rtp_buffer_map (buffers->data, GST_MAP_READ, &rtpbuffer);
fail_unless_equals_int (66, gst_rtp_buffer_get_ssrc (&rtpbuffer));
fail_unless_equals_int64 (200 - 57 + 1000 + i,
gst_rtp_buffer_get_timestamp (&rtpbuffer));
fail_unless_equals_int (100 + 1 + i, gst_rtp_buffer_get_seq (&rtpbuffer));
gst_rtp_buffer_unmap (&rtpbuffer);
inbuf = gst_rtp_buffer_new_allocate (10, 0, 0);
GST_BUFFER_PTS (inbuf) = i * 1000 + 500;
GST_BUFFER_DURATION (inbuf) = 1000;
gst_rtp_buffer_map (inbuf, GST_MAP_WRITE, &rtpbuffer);
gst_rtp_buffer_set_version (&rtpbuffer, 2);
gst_rtp_buffer_set_payload_type (&rtpbuffer, 98);
gst_rtp_buffer_set_ssrc (&rtpbuffer, 44);
gst_rtp_buffer_set_timestamp (&rtpbuffer, 200 + i);
gst_rtp_buffer_set_seq (&rtpbuffer, 2000 + i);
gst_rtp_buffer_unmap (&rtpbuffer);
fail_unless (gst_pad_push (pad, inbuf) == GST_FLOW_OK);
g_list_foreach (buffers, (GFunc) gst_buffer_unref, NULL);
g_list_free (buffers);
buffers = NULL;
}
}
static GstFlowReturn
gst_rtp_dec_chain_rtp (GstPad * pad, GstObject * parent, GstBuffer * buffer)
{
GstFlowReturn res;
GstRTPDec *rtpdec;
GstRTPDecSession *session;
guint32 ssrc;
guint8 pt;
GstRTPBuffer rtp = { NULL, };
rtpdec = GST_RTP_DEC (parent);
GST_DEBUG_OBJECT (rtpdec, "got rtp packet");
if (!gst_rtp_buffer_map (buffer, GST_MAP_READ, &rtp))
goto bad_packet;
ssrc = gst_rtp_buffer_get_ssrc (&rtp);
pt = gst_rtp_buffer_get_payload_type (&rtp);
gst_rtp_buffer_unmap (&rtp);
GST_DEBUG_OBJECT (rtpdec, "SSRC %08x, PT %d", ssrc, pt);
/* find session */
session = gst_pad_get_element_private (pad);
/* see if we have the pad */
if (!session->active) {
GstPadTemplate *templ;
GstElementClass *klass;
gchar *name;
GstCaps *caps;
GValue ret = { 0 };
GValue args[3] = { {0}
, {0}
, {0}
};
GST_DEBUG_OBJECT (rtpdec, "creating stream");
session->ssrc = ssrc;
session->pt = pt;
/* get pt map */
g_value_init (&args[0], GST_TYPE_ELEMENT);
g_value_set_object (&args[0], rtpdec);
g_value_init (&args[1], G_TYPE_UINT);
g_value_set_uint (&args[1], session->id);
g_value_init (&args[2], G_TYPE_UINT);
g_value_set_uint (&args[2], pt);
g_value_init (&ret, GST_TYPE_CAPS);
g_value_set_boxed (&ret, NULL);
g_signal_emitv (args, gst_rtp_dec_signals[SIGNAL_REQUEST_PT_MAP], 0, &ret);
caps = (GstCaps *) g_value_get_boxed (&ret);
name = g_strdup_printf ("recv_rtp_src_%u_%u_%u", session->id, ssrc, pt);
klass = GST_ELEMENT_GET_CLASS (rtpdec);
templ = gst_element_class_get_pad_template (klass, "recv_rtp_src_%u_%u_%u");
session->recv_rtp_src = gst_pad_new_from_template (templ, name);
g_free (name);
gst_pad_set_caps (session->recv_rtp_src, caps);
gst_pad_set_element_private (session->recv_rtp_src, session);
gst_pad_set_query_function (session->recv_rtp_src, gst_rtp_dec_query_src);
gst_pad_set_active (session->recv_rtp_src, TRUE);
gst_element_add_pad (GST_ELEMENT_CAST (rtpdec), session->recv_rtp_src);
session->active = TRUE;
}
res = gst_pad_push (session->recv_rtp_src, buffer);
return res;
bad_packet:
{
GST_ELEMENT_WARNING (rtpdec, STREAM, DECODE, (NULL),
("RTP packet did not validate, dropping"));
gst_buffer_unref (buffer);
return GST_FLOW_OK;
}
}
gboolean
kms_rtp_synchronizer_process_rtp_buffer_mapped (KmsRtpSynchronizer * self,
GstRTPBuffer * rtp_buffer, GError ** error)
{
GstBuffer *buffer = rtp_buffer->buffer;
guint64 pts_orig, ext_ts, last_sr_ext_ts, last_sr_ntp_ns_time;
guint64 diff_ntp_ns_time;
guint8 pt;
guint32 ssrc, ts;
gint32 clock_rate;
gboolean ret = TRUE;
ssrc = gst_rtp_buffer_get_ssrc (rtp_buffer);
KMS_RTP_SYNCHRONIZER_LOCK (self);
if (self->priv->ssrc == 0) {
self->priv->ssrc = ssrc;
} else if (ssrc != self->priv->ssrc) {
gchar *msg = g_strdup_printf ("Invalid SSRC (%u), not matching with %u",
ssrc, self->priv->ssrc);
GST_ERROR_OBJECT (self, "%s", msg);
g_set_error_literal (error, KMS_RTP_SYNC_ERROR, KMS_RTP_SYNC_INVALID_DATA,
msg);
g_free (msg);
KMS_RTP_SYNCHRONIZER_UNLOCK (self);
return FALSE;
}
pt = gst_rtp_buffer_get_payload_type (rtp_buffer);
if (pt != self->priv->pt || self->priv->clock_rate <= 0) {
gchar *msg =
g_strdup_printf ("Invalid clock-rate %d for PT %u, not changing PTS",
self->priv->clock_rate, pt);
GST_ERROR_OBJECT (self, "%s", msg);
g_set_error_literal (error, KMS_RTP_SYNC_ERROR, KMS_RTP_SYNC_INVALID_DATA,
msg);
g_free (msg);
KMS_RTP_SYNCHRONIZER_UNLOCK (self);
return FALSE;
}
pts_orig = GST_BUFFER_PTS (buffer);
ts = gst_rtp_buffer_get_timestamp (rtp_buffer);
gst_rtp_buffer_ext_timestamp (&self->priv->ext_ts, ts);
if (self->priv->feeded_sorted) {
if (self->priv->fs_last_ext_ts != -1
&& self->priv->ext_ts < self->priv->fs_last_ext_ts) {
guint16 seq = gst_rtp_buffer_get_seq (rtp_buffer);
gchar *msg =
g_strdup_printf
("Received an unsorted RTP buffer when expecting sorted (ssrc: %"
G_GUINT32_FORMAT ", seq: %" G_GUINT16_FORMAT ", ts: %"
G_GUINT32_FORMAT ", ext_ts: %" G_GUINT64_FORMAT
"). Moving to unsorted mode",
ssrc, seq, ts, self->priv->ext_ts);
GST_ERROR_OBJECT (self, "%s", msg);
g_set_error_literal (error, KMS_RTP_SYNC_ERROR, KMS_RTP_SYNC_INVALID_DATA,
msg);
g_free (msg);
self->priv->feeded_sorted = FALSE;
ret = FALSE;
} else if (self->priv->ext_ts == self->priv->fs_last_ext_ts) {
GST_BUFFER_PTS (buffer) = self->priv->fs_last_pts;
goto end;
}
}
if (!self->priv->base_initiated) {
GST_DEBUG_OBJECT (self,
"Do not sync data for SSRC %u and PT %u, interpolating PTS", ssrc, pt);
if (!self->priv->base_interpolate_initiated) {
self->priv->base_interpolate_ext_ts = self->priv->ext_ts;
self->priv->base_interpolate_time = GST_BUFFER_PTS (buffer);
self->priv->base_interpolate_initiated = TRUE;
} else {
buffer = gst_buffer_make_writable (buffer);
GST_BUFFER_PTS (buffer) = self->priv->base_interpolate_time;
kms_rtp_synchronizer_rtp_diff (self, rtp_buffer, self->priv->clock_rate,
self->priv->base_interpolate_ext_ts);
}
} else {
gboolean wrapped_down, wrapped_up;
wrapped_down = wrapped_up = FALSE;
buffer = gst_buffer_make_writable (buffer);
GST_BUFFER_PTS (buffer) = self->priv->base_sync_time;
if (self->priv->last_sr_ntp_ns_time > self->priv->base_ntp_ns_time) {
diff_ntp_ns_time =
self->priv->last_sr_ntp_ns_time - self->priv->base_ntp_ns_time;
wrapped_up = diff_ntp_ns_time > (G_MAXUINT64 - GST_BUFFER_PTS (buffer));
GST_BUFFER_PTS (buffer) += diff_ntp_ns_time;
} else if (self->priv->last_sr_ntp_ns_time < self->priv->base_ntp_ns_time) {
diff_ntp_ns_time =
self->priv->base_ntp_ns_time - self->priv->last_sr_ntp_ns_time;
wrapped_down = GST_BUFFER_PTS (buffer) < diff_ntp_ns_time;
GST_BUFFER_PTS (buffer) -= diff_ntp_ns_time;
}
/* if equals do nothing */
kms_rtp_synchronizer_rtp_diff_full (self, rtp_buffer,
self->priv->clock_rate, self->priv->last_sr_ext_ts, wrapped_down,
wrapped_up);
}
if (self->priv->feeded_sorted) {
if (GST_BUFFER_PTS (buffer) < self->priv->fs_last_pts) {
guint16 seq = gst_rtp_buffer_get_seq (rtp_buffer);
GST_WARNING_OBJECT (self,
"Non monotonic PTS assignment in sorted mode (ssrc: %"
G_GUINT32_FORMAT ", seq: %" G_GUINT16_FORMAT ", ts: %"
G_GUINT32_FORMAT ", ext_ts: %" G_GUINT64_FORMAT
"). Forcing monotonic", ssrc, seq, ts, self->priv->ext_ts);
GST_BUFFER_PTS (buffer) = self->priv->fs_last_pts;
}
self->priv->fs_last_ext_ts = self->priv->ext_ts;
self->priv->fs_last_pts = GST_BUFFER_PTS (buffer);
}
end:
clock_rate = self->priv->clock_rate;
ext_ts = self->priv->ext_ts;
last_sr_ext_ts = self->priv->last_sr_ext_ts;
last_sr_ntp_ns_time = self->priv->last_sr_ntp_ns_time;
KMS_RTP_SYNCHRONIZER_UNLOCK (self);
kms_rtp_sync_context_write_stats (self->priv->context, ssrc, clock_rate,
pts_orig, GST_BUFFER_PTS (buffer), GST_BUFFER_DTS (buffer), ext_ts,
last_sr_ntp_ns_time, last_sr_ext_ts);
return ret;
}
static GstFlowReturn
gst_rtp_rtx_receive_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
{
GstRtpRtxReceive *rtx = GST_RTP_RTX_RECEIVE (parent);
GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
GstFlowReturn ret = GST_FLOW_OK;
GstBuffer *new_buffer = NULL;
guint32 ssrc = 0;
gpointer ssrc1 = 0;
guint32 ssrc2 = 0;
guint16 seqnum = 0;
guint16 orign_seqnum = 0;
guint8 payload_type = 0;
guint8 origin_payload_type = 0;
gboolean is_rtx;
gboolean drop = FALSE;
/* map current rtp packet to parse its header */
gst_rtp_buffer_map (buffer, GST_MAP_READ, &rtp);
ssrc = gst_rtp_buffer_get_ssrc (&rtp);
seqnum = gst_rtp_buffer_get_seq (&rtp);
payload_type = gst_rtp_buffer_get_payload_type (&rtp);
/* check if we have a retransmission packet (this information comes from SDP) */
GST_OBJECT_LOCK (rtx);
rtx->last_time = GST_BUFFER_PTS (buffer);
if (g_hash_table_size (rtx->seqnum_ssrc1_map) > 0) {
GHashTableIter iter;
gpointer key, value;
g_hash_table_iter_init (&iter, rtx->seqnum_ssrc1_map);
while (g_hash_table_iter_next (&iter, &key, &value)) {
SsrcAssoc *assoc = value;
/* remove association request if it is too old */
if (GST_CLOCK_TIME_IS_VALID (rtx->last_time) &&
GST_CLOCK_TIME_IS_VALID (assoc->time) &&
assoc->time + ASSOC_TIMEOUT < rtx->last_time) {
g_hash_table_iter_remove (&iter);
}
}
}
is_rtx =
g_hash_table_lookup_extended (rtx->rtx_pt_map,
GUINT_TO_POINTER (payload_type), NULL, NULL);
/* if the current packet is from a retransmission stream */
if (is_rtx) {
/* increase our statistic */
++rtx->num_rtx_packets;
/* read OSN in the rtx payload */
orign_seqnum = GST_READ_UINT16_BE (gst_rtp_buffer_get_payload (&rtp));
origin_payload_type =
GPOINTER_TO_UINT (g_hash_table_lookup (rtx->rtx_pt_map,
GUINT_TO_POINTER (payload_type)));
/* first we check if we already have associated this retransmission stream
* to a master stream */
if (g_hash_table_lookup_extended (rtx->ssrc2_ssrc1_map,
GUINT_TO_POINTER (ssrc), NULL, &ssrc1)) {
GST_DEBUG_OBJECT (rtx,
"packet is from retransmission stream %" G_GUINT32_FORMAT
" already associated to master stream %" G_GUINT32_FORMAT, ssrc,
GPOINTER_TO_UINT (ssrc1));
ssrc2 = ssrc;
} else {
SsrcAssoc *assoc;
/* the current retransmitted packet has its rtx stream not already
* associated to a master stream, so retrieve it from our request
* history */
if (g_hash_table_lookup_extended (rtx->seqnum_ssrc1_map,
GUINT_TO_POINTER (orign_seqnum), NULL, (gpointer *) & assoc)) {
GST_DEBUG_OBJECT (rtx,
"associate retransmitted stream %" G_GUINT32_FORMAT
" to master stream %" G_GUINT32_FORMAT " thanks to packet %"
G_GUINT16_FORMAT "", ssrc, assoc->ssrc, orign_seqnum);
ssrc1 = GUINT_TO_POINTER (assoc->ssrc);
ssrc2 = ssrc;
/* just put a guard */
if (GPOINTER_TO_UINT (ssrc1) == ssrc2)
GST_WARNING_OBJECT (rtx, "RTX receiver ssrc2_ssrc1_map bad state, "
"ssrc %" G_GUINT32_FORMAT " are the same\n", ssrc);
/* free the spot so that this seqnum can be used to do another
* association */
g_hash_table_remove (rtx->seqnum_ssrc1_map,
GUINT_TO_POINTER (orign_seqnum));
/* actually do the association between rtx stream and master stream */
g_hash_table_insert (rtx->ssrc2_ssrc1_map, GUINT_TO_POINTER (ssrc2),
ssrc1);
/* also do the association between master stream and rtx stream
* every ssrc are unique so we can use the same hash table
* for both retrieving the ssrc1 from ssrc2 and also ssrc2 from ssrc1
*/
g_hash_table_insert (rtx->ssrc2_ssrc1_map, ssrc1,
GUINT_TO_POINTER (ssrc2));
} else {
/* we are not able to associate this rtx packet with a master stream */
GST_DEBUG_OBJECT (rtx,
"drop rtx packet because its orign_seqnum %" G_GUINT16_FORMAT
" is not in pending retransmission requests", orign_seqnum);
drop = TRUE;
}
}
}
/* if not dropped the packet was successfully associated */
if (is_rtx && !drop)
++rtx->num_rtx_assoc_packets;
GST_OBJECT_UNLOCK (rtx);
/* just drop the packet if the association could not have been made */
if (drop) {
gst_rtp_buffer_unmap (&rtp);
gst_buffer_unref (buffer);
return GST_FLOW_OK;
}
/* create the retransmission packet */
if (is_rtx)
new_buffer =
_gst_rtp_buffer_new_from_rtx (&rtp, GPOINTER_TO_UINT (ssrc1),
orign_seqnum, origin_payload_type);
gst_rtp_buffer_unmap (&rtp);
/* push the packet */
if (is_rtx) {
gst_buffer_unref (buffer);
GST_LOG_OBJECT (rtx, "push packet seqnum:%" G_GUINT16_FORMAT
" from a restransmission stream ssrc2:%" G_GUINT32_FORMAT " (src %"
G_GUINT32_FORMAT ")", orign_seqnum, ssrc2, GPOINTER_TO_UINT (ssrc1));
ret = gst_pad_push (rtx->srcpad, new_buffer);
} else {
GST_LOG_OBJECT (rtx, "push packet seqnum:%" G_GUINT16_FORMAT
" from a master stream ssrc: %" G_GUINT32_FORMAT, seqnum, ssrc);
ret = gst_pad_push (rtx->srcpad, buffer);
}
return ret;
}
/* takes ownership of the input buffer */
static GstFlowReturn
gst_rtp_base_depayload_handle_buffer (GstRTPBaseDepayload * filter,
GstRTPBaseDepayloadClass * bclass, GstBuffer * in)
{
GstBuffer *(*process_rtp_packet_func) (GstRTPBaseDepayload * base,
GstRTPBuffer * rtp_buffer);
GstBuffer *(*process_func) (GstRTPBaseDepayload * base, GstBuffer * in);
GstRTPBaseDepayloadPrivate *priv;
GstFlowReturn ret = GST_FLOW_OK;
GstBuffer *out_buf;
guint32 ssrc;
guint16 seqnum;
guint32 rtptime;
gboolean discont, buf_discont;
gint gap;
GstRTPBuffer rtp = { NULL };
priv = filter->priv;
process_func = bclass->process;
process_rtp_packet_func = bclass->process_rtp_packet;
/* we must have a setcaps first */
if (G_UNLIKELY (!priv->negotiated))
goto not_negotiated;
if (G_UNLIKELY (!gst_rtp_buffer_map (in, GST_MAP_READ, &rtp)))
goto invalid_buffer;
buf_discont = GST_BUFFER_IS_DISCONT (in);
priv->pts = GST_BUFFER_PTS (in);
priv->dts = GST_BUFFER_DTS (in);
priv->duration = GST_BUFFER_DURATION (in);
ssrc = gst_rtp_buffer_get_ssrc (&rtp);
seqnum = gst_rtp_buffer_get_seq (&rtp);
rtptime = gst_rtp_buffer_get_timestamp (&rtp);
priv->last_seqnum = seqnum;
priv->last_rtptime = rtptime;
discont = buf_discont;
GST_LOG_OBJECT (filter, "discont %d, seqnum %u, rtptime %u, pts %"
GST_TIME_FORMAT ", dts %" GST_TIME_FORMAT, buf_discont, seqnum, rtptime,
GST_TIME_ARGS (priv->pts), GST_TIME_ARGS (priv->dts));
/* Check seqnum. This is a very simple check that makes sure that the seqnums
* are strictly increasing, dropping anything that is out of the ordinary. We
* can only do this when the next_seqnum is known. */
if (G_LIKELY (priv->next_seqnum != -1)) {
if (ssrc != priv->last_ssrc) {
GST_LOG_OBJECT (filter,
"New ssrc %u (current ssrc %u), sender restarted",
ssrc, priv->last_ssrc);
discont = TRUE;
} else {
gap = gst_rtp_buffer_compare_seqnum (seqnum, priv->next_seqnum);
/* if we have no gap, all is fine */
if (G_UNLIKELY (gap != 0)) {
GST_LOG_OBJECT (filter, "got packet %u, expected %u, gap %d", seqnum,
priv->next_seqnum, gap);
if (gap < 0) {
/* seqnum > next_seqnum, we are missing some packets, this is always a
* DISCONT. */
GST_LOG_OBJECT (filter, "%d missing packets", gap);
discont = TRUE;
} else {
/* seqnum < next_seqnum, we have seen this packet before, have a
* reordered packet or the sender could be restarted. If the packet
* is not too old, we throw it away as a duplicate. Otherwise we
* mark discont and continue assuming the sender has restarted. See
* also RFC 4737. */
GST_WARNING ("gap %d <= priv->max_reorder %d -> dropping %d",
gap, priv->max_reorder, gap <= priv->max_reorder);
if (gap <= priv->max_reorder)
goto dropping;
GST_LOG_OBJECT (filter,
"%d > %d, packet too old, sender likely restarted", gap,
priv->max_reorder);
discont = TRUE;
}
}
}
}
priv->next_seqnum = (seqnum + 1) & 0xffff;
priv->last_ssrc = ssrc;
if (G_UNLIKELY (discont)) {
priv->discont = TRUE;
if (!buf_discont) {
gpointer old_inbuf = in;
/* we detected a seqnum discont but the buffer was not flagged with a discont,
* set the discont flag so that the subclass can throw away old data. */
GST_LOG_OBJECT (filter, "mark DISCONT on input buffer");
in = gst_buffer_make_writable (in);
GST_BUFFER_FLAG_SET (in, GST_BUFFER_FLAG_DISCONT);
/* depayloaders will check flag on rtpbuffer->buffer, so if the input
* buffer was not writable already we need to remap to make our
* newly-flagged buffer current on the rtpbuffer */
if (in != old_inbuf) {
gst_rtp_buffer_unmap (&rtp);
if (G_UNLIKELY (!gst_rtp_buffer_map (in, GST_MAP_READ, &rtp)))
goto invalid_buffer;
}
}
}
/* prepare segment event if needed */
if (filter->need_newsegment) {
priv->segment_event = create_segment_event (filter, rtptime,
GST_BUFFER_PTS (in));
filter->need_newsegment = FALSE;
}
priv->input_buffer = in;
if (process_rtp_packet_func != NULL) {
out_buf = process_rtp_packet_func (filter, &rtp);
gst_rtp_buffer_unmap (&rtp);
} else if (process_func != NULL) {
gst_rtp_buffer_unmap (&rtp);
out_buf = process_func (filter, in);
} else {
goto no_process;
}
/* let's send it out to processing */
if (out_buf) {
ret = gst_rtp_base_depayload_push (filter, out_buf);
}
gst_buffer_unref (in);
priv->input_buffer = NULL;
return ret;
/* ERRORS */
not_negotiated:
{
/* this is not fatal but should be filtered earlier */
GST_ELEMENT_ERROR (filter, CORE, NEGOTIATION,
("No RTP format was negotiated."),
("Input buffers need to have RTP caps set on them. This is usually "
"achieved by setting the 'caps' property of the upstream source "
"element (often udpsrc or appsrc), or by putting a capsfilter "
"element before the depayloader and setting the 'caps' property "
"on that. Also see http://cgit.freedesktop.org/gstreamer/"
"gst-plugins-good/tree/gst/rtp/README"));
gst_buffer_unref (in);
return GST_FLOW_NOT_NEGOTIATED;
}
invalid_buffer:
{
/* this is not fatal but should be filtered earlier */
GST_ELEMENT_WARNING (filter, STREAM, DECODE, (NULL),
("Received invalid RTP payload, dropping"));
gst_buffer_unref (in);
return GST_FLOW_OK;
}
dropping:
{
gst_rtp_buffer_unmap (&rtp);
GST_WARNING_OBJECT (filter, "%d <= 100, dropping old packet", gap);
gst_buffer_unref (in);
return GST_FLOW_OK;
}
no_process:
{
gst_rtp_buffer_unmap (&rtp);
/* this is not fatal but should be filtered earlier */
GST_ELEMENT_ERROR (filter, STREAM, NOT_IMPLEMENTED, (NULL),
("The subclass does not have a process or process_rtp_packet method"));
gst_buffer_unref (in);
return GST_FLOW_ERROR;
}
}
