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877 lines
26 KiB
C
877 lines
26 KiB
C
/* GStreamer
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* Copyright (C) <2006> Wim Taymans <wim.taymans@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <gst/rtp/gstrtpbuffer.h>
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#include "gstrtph264depay.h"
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GST_DEBUG_CATEGORY_STATIC (rtph264depay_debug);
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#define GST_CAT_DEFAULT (rtph264depay_debug)
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#define DEFAULT_BYTE_STREAM TRUE
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#define DEFAULT_ACCESS_UNIT FALSE
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enum
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{
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PROP_0,
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PROP_BYTE_STREAM,
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PROP_ACCESS_UNIT,
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PROP_LAST
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};
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/* 3 zero bytes syncword */
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static const guint8 sync_bytes[] = { 0, 0, 0, 1 };
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static GstStaticPadTemplate gst_rtp_h264_depay_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("video/x-h264")
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);
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static GstStaticPadTemplate gst_rtp_h264_depay_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("application/x-rtp, "
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"media = (string) \"video\", "
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"payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
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"clock-rate = (int) 90000, " "encoding-name = (string) \"H264\"")
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/** optional parameters **/
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/* "profile-level-id = (string) ANY, " */
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/* "max-mbps = (string) ANY, " */
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/* "max-fs = (string) ANY, " */
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/* "max-cpb = (string) ANY, " */
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/* "max-dpb = (string) ANY, " */
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/* "max-br = (string) ANY, " */
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/* "redundant-pic-cap = (string) { \"0\", \"1\" }, " */
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/* "sprop-parameter-sets = (string) ANY, " */
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/* "parameter-add = (string) { \"0\", \"1\" }, " */
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/* "packetization-mode = (string) { \"0\", \"1\", \"2\" }, " */
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/* "sprop-interleaving-depth = (string) ANY, " */
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/* "sprop-deint-buf-req = (string) ANY, " */
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/* "deint-buf-cap = (string) ANY, " */
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/* "sprop-init-buf-time = (string) ANY, " */
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/* "sprop-max-don-diff = (string) ANY, " */
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/* "max-rcmd-nalu-size = (string) ANY " */
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);
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GST_BOILERPLATE (GstRtpH264Depay, gst_rtp_h264_depay, GstBaseRTPDepayload,
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GST_TYPE_BASE_RTP_DEPAYLOAD);
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static void gst_rtp_h264_depay_finalize (GObject * object);
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static void gst_rtp_h264_depay_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_rtp_h264_depay_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static GstStateChangeReturn gst_rtp_h264_depay_change_state (GstElement *
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element, GstStateChange transition);
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static GstBuffer *gst_rtp_h264_depay_process (GstBaseRTPDepayload * depayload,
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GstBuffer * buf);
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static gboolean gst_rtp_h264_depay_setcaps (GstBaseRTPDepayload * filter,
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GstCaps * caps);
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static void
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gst_rtp_h264_depay_base_init (gpointer klass)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_rtp_h264_depay_src_template));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_rtp_h264_depay_sink_template));
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gst_element_class_set_details_simple (element_class, "RTP H264 depayloader",
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"Codec/Depayloader/Network/RTP",
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"Extracts H264 video from RTP packets (RFC 3984)",
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"Wim Taymans <wim.taymans@gmail.com>");
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}
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static void
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gst_rtp_h264_depay_class_init (GstRtpH264DepayClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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GstBaseRTPDepayloadClass *gstbasertpdepayload_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gstbasertpdepayload_class = (GstBaseRTPDepayloadClass *) klass;
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gobject_class->finalize = gst_rtp_h264_depay_finalize;
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gobject_class->set_property = gst_rtp_h264_depay_set_property;
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gobject_class->get_property = gst_rtp_h264_depay_get_property;
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g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_BYTE_STREAM,
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g_param_spec_boolean ("byte-stream", "Byte Stream",
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"Generate byte stream format of NALU (deprecated; use caps)",
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DEFAULT_BYTE_STREAM, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_ACCESS_UNIT,
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g_param_spec_boolean ("access-unit", "Access Unit",
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"Merge NALU into AU (picture) (deprecated; use caps)",
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DEFAULT_ACCESS_UNIT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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gstelement_class->change_state = gst_rtp_h264_depay_change_state;
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gstbasertpdepayload_class->process = gst_rtp_h264_depay_process;
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gstbasertpdepayload_class->set_caps = gst_rtp_h264_depay_setcaps;
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GST_DEBUG_CATEGORY_INIT (rtph264depay_debug, "rtph264depay", 0,
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"H264 Video RTP Depayloader");
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}
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static void
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gst_rtp_h264_depay_init (GstRtpH264Depay * rtph264depay,
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GstRtpH264DepayClass * klass)
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{
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rtph264depay->adapter = gst_adapter_new ();
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rtph264depay->picture_adapter = gst_adapter_new ();
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rtph264depay->byte_stream = DEFAULT_BYTE_STREAM;
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rtph264depay->merge = DEFAULT_ACCESS_UNIT;
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}
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static void
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gst_rtp_h264_depay_finalize (GObject * object)
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{
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GstRtpH264Depay *rtph264depay;
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rtph264depay = GST_RTP_H264_DEPAY (object);
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if (rtph264depay->codec_data)
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gst_buffer_unref (rtph264depay->codec_data);
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g_object_unref (rtph264depay->adapter);
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g_object_unref (rtph264depay->picture_adapter);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static void
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gst_rtp_h264_depay_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstRtpH264Depay *rtph264depay;
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rtph264depay = GST_RTP_H264_DEPAY (object);
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switch (prop_id) {
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case PROP_BYTE_STREAM:
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rtph264depay->byte_stream = g_value_get_boolean (value);
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break;
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case PROP_ACCESS_UNIT:
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rtph264depay->merge = g_value_get_boolean (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_rtp_h264_depay_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstRtpH264Depay *rtph264depay;
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rtph264depay = GST_RTP_H264_DEPAY (object);
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switch (prop_id) {
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case PROP_BYTE_STREAM:
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g_value_set_boolean (value, rtph264depay->byte_stream);
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break;
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case PROP_ACCESS_UNIT:
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g_value_set_boolean (value, rtph264depay->merge);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_rtp_h264_depay_negotiate (GstRtpH264Depay * rtph264depay)
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{
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GstCaps *caps;
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gint byte_stream = -1;
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gint merge = -1;
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caps =
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gst_pad_get_allowed_caps (GST_BASE_RTP_DEPAYLOAD_SRCPAD (rtph264depay));
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GST_DEBUG_OBJECT (rtph264depay, "allowed caps: %" GST_PTR_FORMAT, caps);
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if (caps) {
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if (gst_caps_get_size (caps) > 0) {
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GstStructure *s = gst_caps_get_structure (caps, 0);
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const gchar *str = NULL;
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if ((str = gst_structure_get_string (s, "stream-format"))) {
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if (strcmp (str, "avc") == 0) {
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byte_stream = FALSE;
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} else if (strcmp (str, "byte-stream") == 0) {
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byte_stream = TRUE;
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} else {
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GST_DEBUG_OBJECT (rtph264depay, "unknown stream-format: %s", str);
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}
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}
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if ((str = gst_structure_get_string (s, "alignment"))) {
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if (strcmp (str, "au") == 0) {
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merge = TRUE;
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} else if (strcmp (str, "nal") == 0) {
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merge = FALSE;
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} else {
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GST_DEBUG_OBJECT (rtph264depay, "unknown alignment: %s", str);
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}
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}
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}
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gst_caps_unref (caps);
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}
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if (byte_stream >= 0) {
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GST_DEBUG_OBJECT (rtph264depay, "downstream requires byte-stream %d",
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byte_stream);
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if (rtph264depay->byte_stream != byte_stream) {
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GST_WARNING_OBJECT (rtph264depay,
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"overriding property setting based on caps");
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rtph264depay->byte_stream = byte_stream;
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}
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}
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if (merge >= 0) {
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GST_DEBUG_OBJECT (rtph264depay, "downstream requires merge %d", merge);
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if (rtph264depay->merge != merge) {
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GST_WARNING_OBJECT (rtph264depay,
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"overriding property setting based on caps");
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rtph264depay->merge = merge;
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}
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}
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}
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static gboolean
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gst_rtp_h264_depay_setcaps (GstBaseRTPDepayload * depayload, GstCaps * caps)
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{
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GstCaps *srccaps;
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gint clock_rate;
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GstStructure *structure = gst_caps_get_structure (caps, 0);
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GstRtpH264Depay *rtph264depay;
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const gchar *ps, *profile;
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GstBuffer *codec_data;
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guint8 *b64;
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gboolean res;
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rtph264depay = GST_RTP_H264_DEPAY (depayload);
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if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
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clock_rate = 90000;
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depayload->clock_rate = clock_rate;
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srccaps = gst_caps_new_simple ("video/x-h264", NULL);
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/* Base64 encoded, comma separated config NALs */
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ps = gst_structure_get_string (structure, "sprop-parameter-sets");
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/* hex: AVCProfileIndication:8 | profile_compat:8 | AVCLevelIndication:8 */
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profile = gst_structure_get_string (structure, "profile-level-id");
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/* negotiate with downstream w.r.t. output format and alignment */
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gst_rtp_h264_depay_negotiate (rtph264depay);
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if (rtph264depay->byte_stream && ps != NULL) {
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/* for bytestream we only need the parameter sets but we don't error out
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* when they are not there, we assume they are in the stream. */
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gchar **params;
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guint len, total;
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gint i;
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params = g_strsplit (ps, ",", 0);
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/* count total number of bytes in base64. Also include the sync bytes in
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* front of the params. */
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len = 0;
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for (i = 0; params[i]; i++) {
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len += strlen (params[i]);
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len += sizeof (sync_bytes);
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}
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/* we seriously overshoot the length, but it's fine. */
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codec_data = gst_buffer_new_and_alloc (len);
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b64 = GST_BUFFER_DATA (codec_data);
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total = 0;
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for (i = 0; params[i]; i++) {
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guint save = 0;
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gint state = 0;
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GST_DEBUG_OBJECT (depayload, "decoding param %d (%s)", i, params[i]);
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memcpy (b64, sync_bytes, sizeof (sync_bytes));
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b64 += sizeof (sync_bytes);
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len =
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g_base64_decode_step (params[i], strlen (params[i]), b64, &state,
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&save);
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GST_DEBUG_OBJECT (depayload, "decoded %d bytes", len);
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total += len + sizeof (sync_bytes);
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b64 += len;
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}
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GST_BUFFER_SIZE (codec_data) = total;
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g_strfreev (params);
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/* keep the codec_data, we need to send it as the first buffer. We cannot
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* push it in the adapter because the adapter might be flushed on discont.
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*/
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if (rtph264depay->codec_data)
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gst_buffer_unref (rtph264depay->codec_data);
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rtph264depay->codec_data = codec_data;
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} else if (!rtph264depay->byte_stream) {
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gchar **params;
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guint8 **sps, **pps;
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guint len, num_sps, num_pps;
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gint i;
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guint8 *data;
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if (ps == NULL)
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goto incomplete_caps;
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params = g_strsplit (ps, ",", 0);
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len = g_strv_length (params);
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GST_DEBUG_OBJECT (depayload, "we have %d params", len);
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sps = g_new0 (guint8 *, len + 1);
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pps = g_new0 (guint8 *, len + 1);
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num_sps = num_pps = 0;
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/* start with 7 bytes header */
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len = 7;
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for (i = 0; params[i]; i++) {
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gsize nal_len;
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guint8 *nalp;
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guint save = 0;
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gint state = 0;
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nal_len = strlen (params[i]);
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nalp = g_malloc (nal_len + 2);
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nal_len =
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g_base64_decode_step (params[i], nal_len, nalp + 2, &state, &save);
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nalp[0] = (nal_len >> 8) & 0xff;
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nalp[1] = nal_len & 0xff;
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len += nal_len + 2;
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/* copy to the right list */
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if ((nalp[2] & 0x1f) == 7) {
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GST_DEBUG_OBJECT (depayload, "adding param %d as SPS %d", i, num_sps);
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sps[num_sps++] = nalp;
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} else {
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GST_DEBUG_OBJECT (depayload, "adding param %d as PPS %d", i, num_pps);
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pps[num_pps++] = nalp;
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}
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}
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g_strfreev (params);
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if (num_sps == 0 || (GST_READ_UINT16_BE (sps[0]) < 3) || num_pps == 0) {
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g_strfreev ((gchar **) pps);
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g_strfreev ((gchar **) sps);
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goto incomplete_caps;
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}
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codec_data = gst_buffer_new_and_alloc (len);
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data = GST_BUFFER_DATA (codec_data);
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/* 8 bits version == 1 */
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*data++ = 1;
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if (profile) {
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guint32 profile_id;
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/* hex: AVCProfileIndication:8 | profile_compat:8 | AVCLevelIndication:8 */
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sscanf (profile, "%6x", &profile_id);
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*data++ = (profile_id >> 16) & 0xff;
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*data++ = (profile_id >> 8) & 0xff;
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*data++ = profile_id & 0xff;
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} else {
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/* extract from SPS */
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*data++ = sps[0][3];
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*data++ = sps[0][4];
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*data++ = sps[0][5];
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}
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/* 6 bits reserved | 2 bits lengthSizeMinusOn */
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*data++ = 0xff;
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/* 3 bits reserved | 5 bits numOfSequenceParameterSets */
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*data++ = 0xe0 | (num_sps & 0x1f);
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/* copy all SPS */
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for (i = 0; sps[i]; i++) {
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len = ((sps[i][0] << 8) | sps[i][1]) + 2;
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GST_DEBUG_OBJECT (depayload, "copy SPS %d of length %d", i, len);
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memcpy (data, sps[i], len);
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g_free (sps[i]);
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data += len;
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}
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g_free (sps);
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/* 8 bits numOfPictureParameterSets */
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*data++ = num_pps;
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/* copy all PPS */
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for (i = 0; pps[i]; i++) {
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len = ((pps[i][0] << 8) | pps[i][1]) + 2;
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GST_DEBUG_OBJECT (depayload, "copy PPS %d of length %d", i, len);
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memcpy (data, pps[i], len);
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g_free (pps[i]);
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data += len;
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}
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g_free (pps);
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GST_BUFFER_SIZE (codec_data) = data - GST_BUFFER_DATA (codec_data);
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gst_caps_set_simple (srccaps,
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"codec_data", GST_TYPE_BUFFER, codec_data, NULL);
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gst_buffer_unref (codec_data);
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}
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gst_caps_set_simple (srccaps, "stream-format", G_TYPE_STRING,
|
|
rtph264depay->byte_stream ? "byte-stream" : "avc",
|
|
"alignment", G_TYPE_STRING, rtph264depay->merge ? "au" : "nal", NULL);
|
|
|
|
res = gst_pad_set_caps (depayload->srcpad, srccaps);
|
|
gst_caps_unref (srccaps);
|
|
|
|
return res;
|
|
|
|
/* ERRORS */
|
|
incomplete_caps:
|
|
{
|
|
GST_DEBUG_OBJECT (depayload, "we have incomplete caps");
|
|
gst_caps_unref (srccaps);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/* SPS/PPS/IDR considered key, all others DELTA;
|
|
* so downstream waiting for keyframe can pick up at SPS/PPS/IDR */
|
|
#define NAL_TYPE_IS_KEY(nt) (((nt) == 5) || ((nt) == 7) || ((nt) == 8))
|
|
|
|
static gboolean
|
|
gst_rtp_h264_depay_handle_nal (GstRtpH264Depay * rtph264depay, GstBuffer * nal,
|
|
GstClockTime in_timestamp)
|
|
{
|
|
GstBaseRTPDepayload *depayload = GST_BASE_RTP_DEPAYLOAD (rtph264depay);
|
|
gint nal_type;
|
|
guint size;
|
|
guint8 *data;
|
|
GstBuffer *outbuf = NULL;
|
|
GstClockTime out_timestamp;
|
|
gboolean keyframe, out_keyframe;
|
|
|
|
size = GST_BUFFER_SIZE (nal);
|
|
if (G_UNLIKELY (size < 5))
|
|
goto short_nal;
|
|
|
|
data = GST_BUFFER_DATA (nal);
|
|
|
|
nal_type = data[4] & 0x1f;
|
|
GST_DEBUG_OBJECT (rtph264depay, "handle NAL type %d", nal_type);
|
|
|
|
keyframe = NAL_TYPE_IS_KEY (nal_type);
|
|
|
|
out_keyframe = keyframe;
|
|
out_timestamp = in_timestamp;
|
|
|
|
if (rtph264depay->merge) {
|
|
gboolean start = FALSE, complete = FALSE;
|
|
|
|
/* consider a coded slices (IDR or not) to start a picture,
|
|
* (so ending the previous one) if first_mb_in_slice == 0
|
|
* (non-0 is part of previous one) */
|
|
/* NOTE this is not entirely according to Access Unit specs in 7.4.1.2.4,
|
|
* but in practice it works in sane cases, needs not much parsing,
|
|
* and also works with broken frame_num in NAL (where spec-wise would fail) */
|
|
if (nal_type == 1 || nal_type == 2 || nal_type == 5) {
|
|
/* we have a picture start */
|
|
start = TRUE;
|
|
if (data[5] & 0x80) {
|
|
/* first_mb_in_slice == 0 completes a picture */
|
|
complete = TRUE;
|
|
}
|
|
} else if (nal_type >= 6 && nal_type <= 9) {
|
|
/* SEI, SPS, PPS, AU terminate picture */
|
|
complete = TRUE;
|
|
}
|
|
GST_DEBUG_OBJECT (depayload, "start %d, complete %d", start, complete);
|
|
|
|
if (complete && rtph264depay->picture_start) {
|
|
guint outsize;
|
|
|
|
/* we had a picture in the adapter and we completed it */
|
|
GST_DEBUG_OBJECT (depayload, "taking completed AU");
|
|
outsize = gst_adapter_available (rtph264depay->picture_adapter);
|
|
outbuf = gst_adapter_take_buffer (rtph264depay->picture_adapter, outsize);
|
|
|
|
out_timestamp = rtph264depay->last_ts;
|
|
out_keyframe = rtph264depay->last_keyframe;
|
|
|
|
rtph264depay->last_keyframe = FALSE;
|
|
rtph264depay->picture_start = FALSE;
|
|
}
|
|
|
|
/* add to adapter */
|
|
GST_DEBUG_OBJECT (depayload, "adding NAL to picture adapter");
|
|
gst_adapter_push (rtph264depay->picture_adapter, nal);
|
|
rtph264depay->last_ts = in_timestamp;
|
|
rtph264depay->last_keyframe |= keyframe;
|
|
rtph264depay->picture_start |= start;
|
|
} else {
|
|
/* no merge, output is input nal */
|
|
GST_DEBUG_OBJECT (depayload, "using NAL as output");
|
|
outbuf = nal;
|
|
}
|
|
|
|
if (outbuf) {
|
|
/* prepend codec_data */
|
|
if (rtph264depay->codec_data) {
|
|
GST_DEBUG_OBJECT (depayload, "prepending codec_data");
|
|
outbuf = gst_buffer_join (rtph264depay->codec_data, outbuf);
|
|
rtph264depay->codec_data = NULL;
|
|
out_keyframe = TRUE;
|
|
}
|
|
outbuf = gst_buffer_make_metadata_writable (outbuf);
|
|
|
|
GST_BUFFER_TIMESTAMP (outbuf) = out_timestamp;
|
|
|
|
if (out_keyframe)
|
|
GST_BUFFER_FLAG_UNSET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
|
|
else
|
|
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
|
|
|
|
gst_buffer_set_caps (outbuf, GST_PAD_CAPS (depayload->srcpad));
|
|
|
|
gst_base_rtp_depayload_push (depayload, outbuf);
|
|
}
|
|
|
|
return TRUE;
|
|
|
|
/* ERRORS */
|
|
short_nal:
|
|
{
|
|
GST_WARNING_OBJECT (depayload, "dropping short NAL");
|
|
gst_buffer_unref (nal);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
static GstBuffer *
|
|
gst_rtp_h264_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
|
|
{
|
|
GstRtpH264Depay *rtph264depay;
|
|
GstBuffer *outbuf;
|
|
guint8 nal_unit_type;
|
|
|
|
rtph264depay = GST_RTP_H264_DEPAY (depayload);
|
|
|
|
/* flush remaining data on discont */
|
|
if (GST_BUFFER_IS_DISCONT (buf)) {
|
|
gst_adapter_clear (rtph264depay->adapter);
|
|
rtph264depay->wait_start = TRUE;
|
|
}
|
|
|
|
{
|
|
gint payload_len;
|
|
guint8 *payload;
|
|
guint header_len;
|
|
guint8 nal_ref_idc;
|
|
guint8 *outdata;
|
|
guint outsize, nalu_size;
|
|
GstClockTime timestamp;
|
|
|
|
timestamp = GST_BUFFER_TIMESTAMP (buf);
|
|
|
|
payload_len = gst_rtp_buffer_get_payload_len (buf);
|
|
payload = gst_rtp_buffer_get_payload (buf);
|
|
|
|
GST_DEBUG_OBJECT (rtph264depay, "receiving %d bytes", payload_len);
|
|
|
|
if (payload_len == 0)
|
|
return NULL;
|
|
|
|
/* +---------------+
|
|
* |0|1|2|3|4|5|6|7|
|
|
* +-+-+-+-+-+-+-+-+
|
|
* |F|NRI| Type |
|
|
* +---------------+
|
|
*
|
|
* F must be 0.
|
|
*/
|
|
nal_ref_idc = (payload[0] & 0x60) >> 5;
|
|
nal_unit_type = payload[0] & 0x1f;
|
|
|
|
/* at least one byte header with type */
|
|
header_len = 1;
|
|
|
|
GST_DEBUG_OBJECT (rtph264depay, "NRI %d, Type %d", nal_ref_idc,
|
|
nal_unit_type);
|
|
|
|
switch (nal_unit_type) {
|
|
case 0:
|
|
case 30:
|
|
case 31:
|
|
/* undefined */
|
|
goto undefined_type;
|
|
case 25:
|
|
/* STAP-B Single-time aggregation packet 5.7.1 */
|
|
/* 2 byte extra header for DON */
|
|
header_len += 2;
|
|
/* fallthrough */
|
|
case 24:
|
|
{
|
|
/* strip headers */
|
|
payload += header_len;
|
|
payload_len -= header_len;
|
|
|
|
rtph264depay->wait_start = FALSE;
|
|
|
|
|
|
/* STAP-A Single-time aggregation packet 5.7.1 */
|
|
while (payload_len > 2) {
|
|
/* 1
|
|
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | NALU Size |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
*/
|
|
nalu_size = (payload[0] << 8) | payload[1];
|
|
|
|
if (nalu_size > payload_len)
|
|
nalu_size = payload_len;
|
|
|
|
outsize = nalu_size + sizeof (sync_bytes);
|
|
outbuf = gst_buffer_new_and_alloc (outsize);
|
|
outdata = GST_BUFFER_DATA (outbuf);
|
|
if (rtph264depay->byte_stream) {
|
|
memcpy (outdata, sync_bytes, sizeof (sync_bytes));
|
|
} else {
|
|
outdata[0] = outdata[1] = 0;
|
|
outdata[2] = payload[0];
|
|
outdata[3] = payload[1];
|
|
}
|
|
|
|
/* strip NALU size */
|
|
payload += 2;
|
|
payload_len -= 2;
|
|
|
|
outdata += sizeof (sync_bytes);
|
|
memcpy (outdata, payload, nalu_size);
|
|
|
|
gst_adapter_push (rtph264depay->adapter, outbuf);
|
|
|
|
payload += nalu_size;
|
|
payload_len -= nalu_size;
|
|
}
|
|
|
|
outsize = gst_adapter_available (rtph264depay->adapter);
|
|
outbuf = gst_adapter_take_buffer (rtph264depay->adapter, outsize);
|
|
|
|
gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf, timestamp);
|
|
break;
|
|
}
|
|
case 26:
|
|
/* MTAP16 Multi-time aggregation packet 5.7.2 */
|
|
header_len = 5;
|
|
/* fallthrough, not implemented */
|
|
case 27:
|
|
/* MTAP24 Multi-time aggregation packet 5.7.2 */
|
|
header_len = 6;
|
|
goto not_implemented;
|
|
break;
|
|
case 28:
|
|
case 29:
|
|
{
|
|
/* FU-A Fragmentation unit 5.8 */
|
|
/* FU-B Fragmentation unit 5.8 */
|
|
gboolean S, E;
|
|
|
|
/* +---------------+
|
|
* |0|1|2|3|4|5|6|7|
|
|
* +-+-+-+-+-+-+-+-+
|
|
* |S|E|R| Type |
|
|
* +---------------+
|
|
*
|
|
* R is reserved and always 0
|
|
*/
|
|
S = (payload[1] & 0x80) == 0x80;
|
|
E = (payload[1] & 0x40) == 0x40;
|
|
|
|
GST_DEBUG_OBJECT (rtph264depay, "S %d, E %d", S, E);
|
|
|
|
if (rtph264depay->wait_start && !S)
|
|
goto waiting_start;
|
|
|
|
if (S) {
|
|
/* NAL unit starts here */
|
|
guint8 nal_header;
|
|
|
|
rtph264depay->wait_start = FALSE;
|
|
|
|
/* reconstruct NAL header */
|
|
nal_header = (payload[0] & 0xe0) | (payload[1] & 0x1f);
|
|
|
|
/* strip type header, keep FU header, we'll reuse it to reconstruct
|
|
* the NAL header. */
|
|
payload += 1;
|
|
payload_len -= 1;
|
|
|
|
nalu_size = payload_len;
|
|
outsize = nalu_size + sizeof (sync_bytes);
|
|
outbuf = gst_buffer_new_and_alloc (outsize);
|
|
outdata = GST_BUFFER_DATA (outbuf);
|
|
outdata += sizeof (sync_bytes);
|
|
memcpy (outdata, payload, nalu_size);
|
|
outdata[0] = nal_header;
|
|
|
|
GST_DEBUG_OBJECT (rtph264depay, "queueing %d bytes", outsize);
|
|
|
|
/* and assemble in the adapter */
|
|
gst_adapter_push (rtph264depay->adapter, outbuf);
|
|
} else {
|
|
/* strip off FU indicator and FU header bytes */
|
|
payload += 2;
|
|
payload_len -= 2;
|
|
|
|
outsize = payload_len;
|
|
outbuf = gst_buffer_new_and_alloc (outsize);
|
|
outdata = GST_BUFFER_DATA (outbuf);
|
|
memcpy (outdata, payload, outsize);
|
|
|
|
GST_DEBUG_OBJECT (rtph264depay, "queueing %d bytes", outsize);
|
|
|
|
/* and assemble in the adapter */
|
|
gst_adapter_push (rtph264depay->adapter, outbuf);
|
|
}
|
|
|
|
/* if NAL unit ends, flush the adapter */
|
|
if (E) {
|
|
GST_DEBUG_OBJECT (rtph264depay, "output %d bytes", outsize);
|
|
|
|
outsize = gst_adapter_available (rtph264depay->adapter);
|
|
outbuf = gst_adapter_take_buffer (rtph264depay->adapter, outsize);
|
|
outdata = GST_BUFFER_DATA (outbuf);
|
|
|
|
if (rtph264depay->byte_stream) {
|
|
memcpy (outdata, sync_bytes, sizeof (sync_bytes));
|
|
} else {
|
|
outsize -= 4;
|
|
outdata[0] = (outsize >> 24);
|
|
outdata[1] = (outsize >> 16);
|
|
outdata[2] = (outsize >> 8);
|
|
outdata[3] = (outsize);
|
|
}
|
|
gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf, timestamp);
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
{
|
|
rtph264depay->wait_start = FALSE;
|
|
|
|
/* 1-23 NAL unit Single NAL unit packet per H.264 5.6 */
|
|
/* the entire payload is the output buffer */
|
|
nalu_size = payload_len;
|
|
outsize = nalu_size + sizeof (sync_bytes);
|
|
outbuf = gst_buffer_new_and_alloc (outsize);
|
|
outdata = GST_BUFFER_DATA (outbuf);
|
|
if (rtph264depay->byte_stream) {
|
|
memcpy (outdata, sync_bytes, sizeof (sync_bytes));
|
|
} else {
|
|
outdata[0] = outdata[1] = 0;
|
|
outdata[2] = nalu_size >> 8;
|
|
outdata[3] = nalu_size & 0xff;
|
|
}
|
|
outdata += sizeof (sync_bytes);
|
|
memcpy (outdata, payload, nalu_size);
|
|
|
|
gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf, timestamp);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
|
|
/* ERRORS */
|
|
undefined_type:
|
|
{
|
|
GST_ELEMENT_WARNING (rtph264depay, STREAM, DECODE,
|
|
(NULL), ("Undefined packet type"));
|
|
return NULL;
|
|
}
|
|
waiting_start:
|
|
{
|
|
GST_DEBUG_OBJECT (rtph264depay, "waiting for start");
|
|
return NULL;
|
|
}
|
|
not_implemented:
|
|
{
|
|
GST_ELEMENT_ERROR (rtph264depay, STREAM, FORMAT,
|
|
(NULL), ("NAL unit type %d not supported yet", nal_unit_type));
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
static GstStateChangeReturn
|
|
gst_rtp_h264_depay_change_state (GstElement * element,
|
|
GstStateChange transition)
|
|
{
|
|
GstRtpH264Depay *rtph264depay;
|
|
GstStateChangeReturn ret;
|
|
|
|
rtph264depay = GST_RTP_H264_DEPAY (element);
|
|
|
|
switch (transition) {
|
|
case GST_STATE_CHANGE_NULL_TO_READY:
|
|
break;
|
|
case GST_STATE_CHANGE_READY_TO_PAUSED:
|
|
gst_adapter_clear (rtph264depay->adapter);
|
|
rtph264depay->wait_start = TRUE;
|
|
gst_adapter_clear (rtph264depay->picture_adapter);
|
|
rtph264depay->picture_start = FALSE;
|
|
rtph264depay->last_keyframe = FALSE;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
|
|
|
|
switch (transition) {
|
|
case GST_STATE_CHANGE_READY_TO_NULL:
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
gboolean
|
|
gst_rtp_h264_depay_plugin_init (GstPlugin * plugin)
|
|
{
|
|
return gst_element_register (plugin, "rtph264depay",
|
|
GST_RANK_SECONDARY, GST_TYPE_RTP_H264_DEPAY);
|
|
}
|