/* gstrtpvp9depay.c - Source for GstRtpVP9Depay * Copyright (C) 2011 Sjoerd Simons * Copyright (C) 2011 Collabora Ltd. * Contact: Youness Alaoui * Copyright (C) 2015 Stian Selnes * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include "gstrtpvp9depay.h" #include "gstrtputils.h" #include #include GST_DEBUG_CATEGORY_STATIC (gst_rtp_vp9_depay_debug); #define GST_CAT_DEFAULT gst_rtp_vp9_depay_debug static void gst_rtp_vp9_depay_dispose (GObject * object); static GstBuffer *gst_rtp_vp9_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp); static GstStateChangeReturn gst_rtp_vp9_depay_change_state (GstElement * element, GstStateChange transition); static gboolean gst_rtp_vp9_depay_handle_event (GstRTPBaseDepayload * depay, GstEvent * event); G_DEFINE_TYPE (GstRtpVP9Depay, gst_rtp_vp9_depay, GST_TYPE_RTP_BASE_DEPAYLOAD); static GstStaticPadTemplate gst_rtp_vp9_depay_src_template = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/x-vp9")); static GstStaticPadTemplate gst_rtp_vp9_depay_sink_template = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("application/x-rtp, " "clock-rate = (int) 90000," "media = (string) \"video\"," "encoding-name = (string) { \"VP9\", \"VP9-DRAFT-IETF-01\" }")); static void gst_rtp_vp9_depay_init (GstRtpVP9Depay * self) { self->adapter = gst_adapter_new (); self->started = FALSE; } static void gst_rtp_vp9_depay_class_init (GstRtpVP9DepayClass * gst_rtp_vp9_depay_class) { GObjectClass *object_class = G_OBJECT_CLASS (gst_rtp_vp9_depay_class); GstElementClass *element_class = GST_ELEMENT_CLASS (gst_rtp_vp9_depay_class); GstRTPBaseDepayloadClass *depay_class = (GstRTPBaseDepayloadClass *) (gst_rtp_vp9_depay_class); gst_element_class_add_static_pad_template (element_class, &gst_rtp_vp9_depay_sink_template); gst_element_class_add_static_pad_template (element_class, &gst_rtp_vp9_depay_src_template); gst_element_class_set_static_metadata (element_class, "RTP VP9 depayloader", "Codec/Depayloader/Network/RTP", "Extracts VP9 video from RTP packets)", "Stian Selnes "); object_class->dispose = gst_rtp_vp9_depay_dispose; element_class->change_state = gst_rtp_vp9_depay_change_state; depay_class->process_rtp_packet = gst_rtp_vp9_depay_process; depay_class->handle_event = gst_rtp_vp9_depay_handle_event; GST_DEBUG_CATEGORY_INIT (gst_rtp_vp9_depay_debug, "rtpvp9depay", 0, "VP9 Video RTP Depayloader"); } static void gst_rtp_vp9_depay_dispose (GObject * object) { GstRtpVP9Depay *self = GST_RTP_VP9_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_vp9_depay_parent_class)->dispose) G_OBJECT_CLASS (gst_rtp_vp9_depay_parent_class)->dispose (object); } static GstBuffer * gst_rtp_vp9_depay_process (GstRTPBaseDepayload * depay, GstRTPBuffer * rtp) { GstRtpVP9Depay *self = GST_RTP_VP9_DEPAY (depay); GstBuffer *payload; guint8 *data; guint hdrsize = 1; guint size; gint spatial_layer = 0; gboolean i_bit, p_bit, l_bit, f_bit, b_bit, e_bit, v_bit; 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); /* Mandatory with at least one header and one vp9 byte */ if (G_UNLIKELY (size < hdrsize + 1)) goto too_small; data = gst_rtp_buffer_get_payload (rtp); i_bit = (data[0] & 0x80) != 0; p_bit = (data[0] & 0x40) != 0; l_bit = (data[0] & 0x20) != 0; f_bit = (data[0] & 0x10) != 0; b_bit = (data[0] & 0x08) != 0; e_bit = (data[0] & 0x04) != 0; v_bit = (data[0] & 0x02) != 0; if (G_UNLIKELY (!self->started)) { /* Check if this is the start of a VP9 layer frame, otherwise bail */ if (!b_bit) goto done; self->started = TRUE; } GST_TRACE_OBJECT (self, "IPLFBEV : %d%d%d%d%d%d%d", i_bit, p_bit, l_bit, f_bit, b_bit, e_bit, v_bit); /* Check I optional header Picture ID */ if (i_bit) { hdrsize++; if (G_UNLIKELY (size < hdrsize + 1)) goto too_small; /* Check M for 15 bits PictureID */ if ((data[1] & 0x80) != 0) { hdrsize++; if (G_UNLIKELY (size < hdrsize + 1)) goto too_small; } } /* flexible-mode not implemented */ g_assert (!f_bit); /* Check L optional header layer indices */ if (l_bit) { hdrsize++; /* Check TL0PICIDX temporal layer zero index (non-flexible mode) */ if (!f_bit) hdrsize++; } /* Check V optional Scalability Structure */ if (v_bit) { guint n_s, y_bit, g_bit; guint8 *ss = &data[hdrsize]; guint sssize = 1; if (G_UNLIKELY (size < hdrsize + sssize + 1)) goto too_small; n_s = (ss[0] & 0xe0) >> 5; y_bit = (ss[0] & 0x10) != 0; g_bit = (ss[0] & 0x08) != 0; GST_TRACE_OBJECT (self, "SS header: N_S=%u, Y=%u, G=%u", n_s, y_bit, g_bit); sssize += y_bit ? (n_s + 1) * 4 : 0; if (G_UNLIKELY (size < hdrsize + sssize + 1)) goto too_small; if (y_bit) { guint i; for (i = 0; i <= n_s; i++) { /* For now, simply use the last layer specified for width and height */ self->ss_width = ss[1 + i * 4] * 256 + ss[2 + i * 4]; self->ss_height = ss[3 + i * 4] * 256 + ss[4 + i * 4]; GST_TRACE_OBJECT (self, "N_S[%d]: WIDTH=%u, HEIGHT=%u", i, self->ss_width, self->ss_height); } } if (g_bit) { guint i, j; guint n_g = ss[sssize]; sssize++; if (G_UNLIKELY (size < hdrsize + sssize + 1)) goto too_small; for (i = 0; i < n_g; i++) { guint t = (ss[sssize] & 0xe0) >> 5; guint u = (ss[sssize] & 0x10) >> 4; guint r = (ss[sssize] & 0x0c) >> 2; GST_TRACE_OBJECT (self, "N_G[%u]: 0x%02x -> T=%u, U=%u, R=%u", i, ss[sssize], t, u, r); for (j = 0; j < r; j++) GST_TRACE_OBJECT (self, " R[%u]: P_DIFF=%u", j, ss[sssize + 1 + j]); sssize += 1 + r; if (G_UNLIKELY (size < hdrsize + sssize + 1)) goto too_small; } } hdrsize += sssize; } 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); { GstMapInfo map; gst_buffer_map (payload, &map, GST_MAP_READ); GST_MEMDUMP_OBJECT (self, "vp9 payload", map.data, 16); gst_buffer_unmap (payload, &map); } 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; gboolean key_frame_first_layer = !p_bit && spatial_layer == 0; if (gst_adapter_available (self->adapter) < 10) goto too_small; out = gst_adapter_take_buffer (self->adapter, gst_adapter_available (self->adapter)); self->started = FALSE; /* mark keyframes */ out = gst_buffer_make_writable (out); /* Filter away all metas that are not sensible to copy */ gst_rtp_drop_meta (GST_ELEMENT_CAST (self), out, g_quark_from_static_string (GST_META_TAG_VIDEO_STR)); if (!key_frame_first_layer) { 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 { GST_BUFFER_FLAG_UNSET (out, GST_BUFFER_FLAG_DELTA_UNIT); if (self->last_width != self->ss_width || self->last_height != self->ss_height) { GstCaps *srccaps; /* Width and height are optional in the RTP header. Consider to parse * the frame header in addition if missing from RTP header */ if (self->ss_width != 0 && self->ss_height != 0) { srccaps = gst_caps_new_simple ("video/x-vp9", "framerate", GST_TYPE_FRACTION, 0, 1, "width", G_TYPE_INT, self->ss_width, "height", G_TYPE_INT, self->ss_height, NULL); } else { srccaps = gst_caps_new_simple ("video/x-vp9", "framerate", GST_TYPE_FRACTION, 0, 1, NULL); } gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depay), srccaps); gst_caps_unref (srccaps); self->caps_sent = TRUE; self->last_width = self->ss_width; self->last_height = self->ss_height; self->ss_width = 0; self->ss_height = 0; } } 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 GstStateChangeReturn gst_rtp_vp9_depay_change_state (GstElement * element, GstStateChange transition) { GstRtpVP9Depay *self = GST_RTP_VP9_DEPAY (element); switch (transition) { case GST_STATE_CHANGE_READY_TO_PAUSED: self->last_width = -1; self->last_height = -1; self->caps_sent = FALSE; break; default: break; } return GST_ELEMENT_CLASS (gst_rtp_vp9_depay_parent_class)->change_state (element, transition); } static gboolean gst_rtp_vp9_depay_handle_event (GstRTPBaseDepayload * depay, GstEvent * event) { GstRtpVP9Depay *self = GST_RTP_VP9_DEPAY (depay); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_FLUSH_STOP: self->last_width = -1; self->last_height = -1; break; default: break; } return GST_RTP_BASE_DEPAYLOAD_CLASS (gst_rtp_vp9_depay_parent_class)->handle_event (depay, event); } gboolean gst_rtp_vp9_depay_plugin_init (GstPlugin * plugin) { return gst_element_register (plugin, "rtpvp9depay", GST_RANK_MARGINAL, GST_TYPE_RTP_VP9_DEPAY); }