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Call handle_nal for each NAL in the STAP-A RTP packet. This makes sure we correctly extract the SPS and PPS. Fixes https://bugzilla.gnome.org/show_bug.cgi?id=730999
1172 lines
35 KiB
C
1172 lines
35 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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, 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/base/gstbitreader.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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/* This is what we'll default to when downstream hasn't
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* expressed a restriction or preference via caps */
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#define DEFAULT_BYTE_STREAM TRUE
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#define DEFAULT_ACCESS_UNIT FALSE
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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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"stream-format = (string) avc, alignment = (string) au; "
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"video/x-h264, "
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"stream-format = (string) byte-stream, alignment = (string) { nal, au }")
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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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"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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#define gst_rtp_h264_depay_parent_class parent_class
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G_DEFINE_TYPE (GstRtpH264Depay, gst_rtp_h264_depay,
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GST_TYPE_RTP_BASE_DEPAYLOAD);
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static void gst_rtp_h264_depay_finalize (GObject * object);
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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 (GstRTPBaseDepayload * depayload,
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GstBuffer * buf);
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static gboolean gst_rtp_h264_depay_setcaps (GstRTPBaseDepayload * filter,
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GstCaps * caps);
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static gboolean gst_rtp_h264_depay_handle_event (GstRTPBaseDepayload * depay,
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GstEvent * event);
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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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GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
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gobject_class->finalize = gst_rtp_h264_depay_finalize;
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gst_element_class_add_pad_template (gstelement_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 (gstelement_class,
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gst_static_pad_template_get (&gst_rtp_h264_depay_sink_template));
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gst_element_class_set_static_metadata (gstelement_class,
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"RTP H264 depayloader", "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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gstelement_class->change_state = gst_rtp_h264_depay_change_state;
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gstrtpbasedepayload_class->process = gst_rtp_h264_depay_process;
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gstrtpbasedepayload_class->set_caps = gst_rtp_h264_depay_setcaps;
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gstrtpbasedepayload_class->handle_event = gst_rtp_h264_depay_handle_event;
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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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{
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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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rtph264depay->sps = g_ptr_array_new_with_free_func (
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(GDestroyNotify) gst_buffer_unref);
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rtph264depay->pps = g_ptr_array_new_with_free_func (
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(GDestroyNotify) gst_buffer_unref);
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}
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static void
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gst_rtp_h264_depay_reset (GstRtpH264Depay * rtph264depay)
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{
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gst_adapter_clear (rtph264depay->adapter);
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rtph264depay->wait_start = TRUE;
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gst_adapter_clear (rtph264depay->picture_adapter);
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rtph264depay->picture_start = FALSE;
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rtph264depay->last_keyframe = FALSE;
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rtph264depay->last_ts = 0;
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rtph264depay->current_fu_type = 0;
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rtph264depay->new_codec_data = FALSE;
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g_ptr_array_set_size (rtph264depay->sps, 0);
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g_ptr_array_set_size (rtph264depay->pps, 0);
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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_ptr_array_free (rtph264depay->sps, TRUE);
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g_ptr_array_free (rtph264depay->pps, TRUE);
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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_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_RTP_BASE_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 != -1) {
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GST_DEBUG_OBJECT (rtph264depay, "downstream requires byte-stream %d",
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byte_stream);
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rtph264depay->byte_stream = byte_stream;
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} else {
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GST_DEBUG_OBJECT (rtph264depay, "defaulting to byte-stream %d",
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DEFAULT_BYTE_STREAM);
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rtph264depay->byte_stream = DEFAULT_BYTE_STREAM;
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}
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if (merge != -1) {
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GST_DEBUG_OBJECT (rtph264depay, "downstream requires merge %d", merge);
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rtph264depay->merge = merge;
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} else {
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GST_DEBUG_OBJECT (rtph264depay, "defaulting to merge %d",
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DEFAULT_ACCESS_UNIT);
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rtph264depay->merge = DEFAULT_ACCESS_UNIT;
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}
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}
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/* Stolen from bad/gst/mpegtsdemux/payloader_parsers.c */
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/* variable length Exp-Golomb parsing according to H.264 spec 9.1*/
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static gboolean
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read_golomb (GstBitReader * br, guint32 * value)
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{
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guint8 b, leading_zeros = -1;
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*value = 1;
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for (b = 0; !b; leading_zeros++) {
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if (!gst_bit_reader_get_bits_uint8 (br, &b, 1))
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return FALSE;
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*value *= 2;
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}
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*value = (*value >> 1) - 1;
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if (leading_zeros > 0) {
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guint32 tmp = 0;
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if (!gst_bit_reader_get_bits_uint32 (br, &tmp, leading_zeros))
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return FALSE;
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*value += tmp;
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}
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return TRUE;
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}
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static gboolean
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parse_sps (GstMapInfo * map, guint32 * sps_id)
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{
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GstBitReader br = GST_BIT_READER_INIT (map->data + 4,
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map->size - 4);
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if (map->size < 5)
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return FALSE;
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if (!read_golomb (&br, sps_id))
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return FALSE;
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return TRUE;
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}
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static gboolean
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parse_pps (GstMapInfo * map, guint32 * sps_id, guint32 * pps_id)
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{
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GstBitReader br = GST_BIT_READER_INIT (map->data + 1,
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map->size - 1);
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if (map->size < 2)
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return FALSE;
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if (!read_golomb (&br, pps_id))
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return FALSE;
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if (!read_golomb (&br, sps_id))
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return FALSE;
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return TRUE;
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}
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static gboolean
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gst_rtp_h264_set_src_caps (GstRtpH264Depay * rtph264depay)
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{
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gboolean res;
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GstCaps *srccaps;
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guchar level = 0;
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guchar profile_compat = G_MAXUINT8;
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if (!rtph264depay->byte_stream &&
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(!rtph264depay->new_codec_data ||
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rtph264depay->sps->len == 0 || rtph264depay->pps->len == 0))
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return TRUE;
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srccaps = gst_caps_new_simple ("video/x-h264",
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"stream-format", G_TYPE_STRING,
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rtph264depay->byte_stream ? "byte-stream" : "avc",
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"alignment", G_TYPE_STRING, rtph264depay->merge ? "au" : "nal", NULL);
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if (!rtph264depay->byte_stream) {
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GstBuffer *codec_data;
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GstMapInfo map;
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GstMapInfo nalmap;
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guint8 *data;
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guint len;
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guint new_size;
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guint i;
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/* start with 7 bytes header */
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len = 7;
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/* count sps & pps */
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for (i = 0; i < rtph264depay->sps->len; i++)
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len += 2 + gst_buffer_get_size (g_ptr_array_index (rtph264depay->sps, i));
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for (i = 0; i < rtph264depay->pps->len; i++)
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len += 2 + gst_buffer_get_size (g_ptr_array_index (rtph264depay->pps, i));
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codec_data = gst_buffer_new_and_alloc (len);
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g_debug ("alloc_len: %u", len);
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gst_buffer_map (codec_data, &map, GST_MAP_READWRITE);
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data = map.data;
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/* 8 bits version == 1 */
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*data++ = 1;
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/* According to: ISO/IEC 14496-15:2004(E) section 5.2.4.1
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* The level is the max level of all SPSes
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* A profile compat bit can only be set if all SPSes include that bit
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*/
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for (i = 0; i < rtph264depay->sps->len; i++) {
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gst_buffer_map (g_ptr_array_index (rtph264depay->sps, i), &nalmap,
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GST_MAP_READ);
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profile_compat &= nalmap.data[2];
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level = MAX (level, nalmap.data[3]);
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gst_buffer_unmap (g_ptr_array_index (rtph264depay->sps, i), &nalmap);
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}
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/* Assume all SPSes use the same profile, so extract from the first SPS */
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gst_buffer_map (g_ptr_array_index (rtph264depay->sps, 0), &nalmap,
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GST_MAP_READ);
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*data++ = nalmap.data[1];
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gst_buffer_unmap (g_ptr_array_index (rtph264depay->sps, 0), &nalmap);
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*data++ = profile_compat;
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*data++ = level;
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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 | (rtph264depay->sps->len & 0x1f);
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/* copy all SPS */
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for (i = 0; i < rtph264depay->sps->len; i++) {
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gst_buffer_map (g_ptr_array_index (rtph264depay->sps, i), &nalmap,
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GST_MAP_READ);
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GST_DEBUG_OBJECT (rtph264depay, "copy SPS %d of length %u", i,
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(guint) nalmap.size);
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GST_WRITE_UINT16_BE (data, nalmap.size);
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data += 2;
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memcpy (data, nalmap.data, nalmap.size);
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data += nalmap.size;
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gst_buffer_unmap (g_ptr_array_index (rtph264depay->sps, i), &nalmap);
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}
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/* 8 bits numOfPictureParameterSets */
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*data++ = rtph264depay->pps->len;
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/* copy all PPS */
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for (i = 0; i < rtph264depay->pps->len; i++) {
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gst_buffer_map (g_ptr_array_index (rtph264depay->pps, i), &nalmap,
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GST_MAP_READ);
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GST_DEBUG_OBJECT (rtph264depay, "copy PPS %d of length %u", i,
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(guint) nalmap.size);
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GST_WRITE_UINT16_BE (data, nalmap.size);
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data += 2;
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memcpy (data, nalmap.data, nalmap.size);
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data += nalmap.size;
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gst_buffer_unmap (g_ptr_array_index (rtph264depay->pps, i), &nalmap);
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}
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new_size = data - map.data;
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gst_buffer_unmap (codec_data, &map);
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gst_buffer_set_size (codec_data, new_size);
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|
|
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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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res = gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (rtph264depay),
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srccaps);
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gst_caps_unref (srccaps);
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if (res)
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rtph264depay->new_codec_data = FALSE;
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return res;
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}
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|
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gboolean
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gst_rtp_h264_add_sps_pps (GstElement * rtph264, GPtrArray * sps_array,
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GPtrArray * pps_array, GstBuffer * nal)
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{
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GstMapInfo map;
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guchar type;
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guint i;
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gst_buffer_map (nal, &map, GST_MAP_READ);
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type = map.data[0] & 0x1f;
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if (type == 7) {
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guint32 sps_id;
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if (!parse_sps (&map, &sps_id)) {
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GST_WARNING_OBJECT (rtph264, "Invalid SPS,"
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" can't parse seq_parameter_set_id");
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goto drop;
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}
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for (i = 0; i < sps_array->len; i++) {
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GstBuffer *sps = g_ptr_array_index (sps_array, i);
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GstMapInfo spsmap;
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guint32 tmp_sps_id;
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gst_buffer_map (sps, &spsmap, GST_MAP_READ);
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parse_sps (&spsmap, &tmp_sps_id);
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if (sps_id == tmp_sps_id) {
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if (map.size == spsmap.size &&
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memcmp (map.data, spsmap.data, spsmap.size) == 0) {
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GST_LOG_OBJECT (rtph264, "Unchanged SPS %u, not updating", sps_id);
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gst_buffer_unmap (sps, &spsmap);
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goto drop;
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} else {
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gst_buffer_unmap (sps, &spsmap);
|
|
g_ptr_array_remove_index_fast (sps_array, i);
|
|
g_ptr_array_add (sps_array, nal);
|
|
GST_LOG_OBJECT (rtph264, "Modified SPS %u, replacing", sps_id);
|
|
goto done;
|
|
}
|
|
}
|
|
gst_buffer_unmap (sps, &spsmap);
|
|
}
|
|
GST_LOG_OBJECT (rtph264, "Adding new SPS %u", sps_id);
|
|
g_ptr_array_add (sps_array, nal);
|
|
} else if (type == 8) {
|
|
guint32 sps_id;
|
|
guint32 pps_id;
|
|
|
|
if (!parse_pps (&map, &sps_id, &pps_id)) {
|
|
GST_WARNING_OBJECT (rtph264, "Invalid PPS,"
|
|
" can't parse seq_parameter_set_id or pic_parameter_set_id");
|
|
goto drop;
|
|
}
|
|
|
|
for (i = 0; i < pps_array->len; i++) {
|
|
GstBuffer *pps = g_ptr_array_index (pps_array, i);
|
|
GstMapInfo ppsmap;
|
|
guint32 tmp_sps_id;
|
|
guint32 tmp_pps_id;
|
|
|
|
|
|
gst_buffer_map (pps, &ppsmap, GST_MAP_READ);
|
|
parse_pps (&ppsmap, &tmp_sps_id, &tmp_pps_id);
|
|
|
|
if (sps_id == tmp_sps_id && pps_id == tmp_pps_id) {
|
|
if (map.size == ppsmap.size &&
|
|
memcmp (map.data, ppsmap.data, ppsmap.size) == 0) {
|
|
GST_LOG_OBJECT (rtph264, "Unchanged PPS %u:%u, not updating", sps_id,
|
|
pps_id);
|
|
gst_buffer_unmap (pps, &ppsmap);
|
|
goto drop;
|
|
} else {
|
|
gst_buffer_unmap (pps, &ppsmap);
|
|
g_ptr_array_remove_index_fast (pps_array, i);
|
|
g_ptr_array_add (pps_array, nal);
|
|
GST_LOG_OBJECT (rtph264, "Modified PPS %u:%u, replacing",
|
|
sps_id, pps_id);
|
|
goto done;
|
|
}
|
|
}
|
|
gst_buffer_unmap (pps, &ppsmap);
|
|
}
|
|
GST_LOG_OBJECT (rtph264, "Adding new PPS %u:%i", sps_id, pps_id);
|
|
g_ptr_array_add (pps_array, nal);
|
|
} else {
|
|
goto drop;
|
|
}
|
|
|
|
done:
|
|
gst_buffer_unmap (nal, &map);
|
|
|
|
return TRUE;
|
|
|
|
drop:
|
|
gst_buffer_unmap (nal, &map);
|
|
gst_buffer_unref (nal);
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
|
|
static void
|
|
gst_rtp_h264_depay_add_sps_pps (GstRtpH264Depay * rtph264depay, GstBuffer * nal)
|
|
{
|
|
if (gst_rtp_h264_add_sps_pps (GST_ELEMENT (rtph264depay),
|
|
rtph264depay->sps, rtph264depay->pps, nal))
|
|
rtph264depay->new_codec_data = TRUE;
|
|
}
|
|
|
|
static gboolean
|
|
gst_rtp_h264_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
|
|
{
|
|
gint clock_rate;
|
|
GstStructure *structure = gst_caps_get_structure (caps, 0);
|
|
GstRtpH264Depay *rtph264depay;
|
|
const gchar *ps;
|
|
GstBuffer *codec_data;
|
|
GstMapInfo map;
|
|
guint8 *ptr;
|
|
|
|
rtph264depay = GST_RTP_H264_DEPAY (depayload);
|
|
|
|
if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
|
|
clock_rate = 90000;
|
|
depayload->clock_rate = clock_rate;
|
|
|
|
/* Base64 encoded, comma separated config NALs */
|
|
ps = gst_structure_get_string (structure, "sprop-parameter-sets");
|
|
|
|
/* negotiate with downstream w.r.t. output format and alignment */
|
|
gst_rtp_h264_depay_negotiate (rtph264depay);
|
|
|
|
if (rtph264depay->byte_stream && ps != NULL) {
|
|
/* for bytestream we only need the parameter sets but we don't error out
|
|
* when they are not there, we assume they are in the stream. */
|
|
gchar **params;
|
|
guint len, total;
|
|
gint i;
|
|
|
|
params = g_strsplit (ps, ",", 0);
|
|
|
|
/* count total number of bytes in base64. Also include the sync bytes in
|
|
* front of the params. */
|
|
len = 0;
|
|
for (i = 0; params[i]; i++) {
|
|
len += strlen (params[i]);
|
|
len += sizeof (sync_bytes);
|
|
}
|
|
/* we seriously overshoot the length, but it's fine. */
|
|
codec_data = gst_buffer_new_and_alloc (len);
|
|
|
|
gst_buffer_map (codec_data, &map, GST_MAP_WRITE);
|
|
ptr = map.data;
|
|
total = 0;
|
|
for (i = 0; params[i]; i++) {
|
|
guint save = 0;
|
|
gint state = 0;
|
|
|
|
GST_DEBUG_OBJECT (depayload, "decoding param %d (%s)", i, params[i]);
|
|
memcpy (ptr, sync_bytes, sizeof (sync_bytes));
|
|
ptr += sizeof (sync_bytes);
|
|
len =
|
|
g_base64_decode_step (params[i], strlen (params[i]), ptr, &state,
|
|
&save);
|
|
GST_DEBUG_OBJECT (depayload, "decoded %d bytes", len);
|
|
total += len + sizeof (sync_bytes);
|
|
ptr += len;
|
|
}
|
|
gst_buffer_unmap (codec_data, &map);
|
|
gst_buffer_resize (codec_data, 0, total);
|
|
g_strfreev (params);
|
|
|
|
/* keep the codec_data, we need to send it as the first buffer. We cannot
|
|
* push it in the adapter because the adapter might be flushed on discont.
|
|
*/
|
|
if (rtph264depay->codec_data)
|
|
gst_buffer_unref (rtph264depay->codec_data);
|
|
rtph264depay->codec_data = codec_data;
|
|
} else if (!rtph264depay->byte_stream) {
|
|
gchar **params;
|
|
gint i;
|
|
|
|
if (ps == NULL)
|
|
goto incomplete_caps;
|
|
|
|
params = g_strsplit (ps, ",", 0);
|
|
|
|
GST_DEBUG_OBJECT (depayload, "we have %d params", g_strv_length (params));
|
|
|
|
/* start with 7 bytes header */
|
|
for (i = 0; params[i]; i++) {
|
|
GstBuffer *nal;
|
|
GstMapInfo nalmap;
|
|
gsize nal_len;
|
|
guint save = 0;
|
|
gint state = 0;
|
|
|
|
nal_len = strlen (params[i]);
|
|
nal = gst_buffer_new_and_alloc (nal_len);
|
|
gst_buffer_map (nal, &nalmap, GST_MAP_READWRITE);
|
|
|
|
nal_len =
|
|
g_base64_decode_step (params[i], nal_len, nalmap.data, &state, &save);
|
|
|
|
GST_DEBUG_OBJECT (depayload, "adding param %d as %s", i,
|
|
((nalmap.data[0] & 0x1f) == 7) ? "SPS" : "PPS");
|
|
|
|
gst_buffer_unmap (nal, &nalmap);
|
|
gst_buffer_set_size (nal, nal_len);
|
|
|
|
gst_rtp_h264_depay_add_sps_pps (rtph264depay, nal);
|
|
}
|
|
g_strfreev (params);
|
|
|
|
if (rtph264depay->sps->len == 0 || rtph264depay->pps->len == 0)
|
|
goto incomplete_caps;
|
|
}
|
|
|
|
return gst_rtp_h264_set_src_caps (rtph264depay);
|
|
|
|
/* ERRORS */
|
|
incomplete_caps:
|
|
{
|
|
GST_DEBUG_OBJECT (depayload, "we have incomplete caps,"
|
|
" doing setcaps later");
|
|
return TRUE;
|
|
}
|
|
}
|
|
|
|
static GstBuffer *
|
|
gst_rtp_h264_complete_au (GstRtpH264Depay * rtph264depay,
|
|
GstClockTime * out_timestamp, gboolean * out_keyframe)
|
|
{
|
|
guint outsize;
|
|
GstBuffer *outbuf;
|
|
|
|
/* we had a picture in the adapter and we completed it */
|
|
GST_DEBUG_OBJECT (rtph264depay, "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;
|
|
|
|
return outbuf;
|
|
}
|
|
|
|
/* 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 GstBuffer *
|
|
gst_rtp_h264_depay_handle_nal (GstRtpH264Depay * rtph264depay, GstBuffer * nal,
|
|
GstClockTime in_timestamp, gboolean marker)
|
|
{
|
|
GstRTPBaseDepayload *depayload = GST_RTP_BASE_DEPAYLOAD (rtph264depay);
|
|
gint nal_type;
|
|
GstMapInfo map;
|
|
GstBuffer *outbuf = NULL;
|
|
GstClockTime out_timestamp;
|
|
gboolean keyframe, out_keyframe;
|
|
|
|
gst_buffer_map (nal, &map, GST_MAP_READ);
|
|
if (G_UNLIKELY (map.size < 5))
|
|
goto short_nal;
|
|
|
|
nal_type = map.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->byte_stream) {
|
|
if (nal_type == 7 || nal_type == 8) {
|
|
gst_rtp_h264_depay_add_sps_pps (rtph264depay,
|
|
gst_buffer_copy_region (nal, GST_BUFFER_COPY_ALL,
|
|
4, gst_buffer_get_size (nal) - 4));
|
|
gst_buffer_unmap (nal, &map);
|
|
gst_buffer_unref (nal);
|
|
return NULL;
|
|
} else if (rtph264depay->sps->len == 0 || rtph264depay->pps->len == 0) {
|
|
/* Down push down any buffer in non-bytestream mode if the SPS/PPS haven't
|
|
* go through yet
|
|
*/
|
|
gst_pad_push_event (GST_RTP_BASE_DEPAYLOAD_SINKPAD (depayload),
|
|
gst_event_new_custom (GST_EVENT_CUSTOM_UPSTREAM,
|
|
gst_structure_new ("GstForceKeyUnit",
|
|
"all-headers", G_TYPE_BOOLEAN, TRUE, NULL)));
|
|
gst_buffer_unmap (nal, &map);
|
|
gst_buffer_unref (nal);
|
|
return NULL;
|
|
}
|
|
|
|
if (rtph264depay->new_codec_data &&
|
|
rtph264depay->sps->len > 0 && rtph264depay->pps->len > 0)
|
|
gst_rtp_h264_set_src_caps (rtph264depay);
|
|
}
|
|
|
|
|
|
if (rtph264depay->merge) {
|
|
gboolean start = FALSE, complete = FALSE;
|
|
|
|
/* marker bit isn't mandatory so in the following code we try to guess
|
|
* an AU boundary by detecting a new picture start */
|
|
if (!marker) {
|
|
/* 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) */
|
|
/* FIXME: this code isn't correct for interlaced content as AUs should be
|
|
* constructed with pairs of fields and the guess here will just push out
|
|
* AUs with a single field in it */
|
|
if (nal_type == 1 || nal_type == 2 || nal_type == 5) {
|
|
/* we have a picture start */
|
|
start = TRUE;
|
|
if (map.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)
|
|
outbuf = gst_rtp_h264_complete_au (rtph264depay, &out_timestamp,
|
|
&out_keyframe);
|
|
}
|
|
/* add to adapter */
|
|
gst_buffer_unmap (nal, &map);
|
|
|
|
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;
|
|
|
|
if (marker)
|
|
outbuf = gst_rtp_h264_complete_au (rtph264depay, &out_timestamp,
|
|
&out_keyframe);
|
|
} else {
|
|
/* no merge, output is input nal */
|
|
GST_DEBUG_OBJECT (depayload, "using NAL as output");
|
|
outbuf = nal;
|
|
gst_buffer_unmap (nal, &map);
|
|
}
|
|
|
|
if (outbuf) {
|
|
/* prepend codec_data */
|
|
if (rtph264depay->codec_data) {
|
|
GST_DEBUG_OBJECT (depayload, "prepending codec_data");
|
|
outbuf = gst_buffer_append (rtph264depay->codec_data, outbuf);
|
|
rtph264depay->codec_data = NULL;
|
|
out_keyframe = TRUE;
|
|
}
|
|
outbuf = gst_buffer_make_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);
|
|
}
|
|
|
|
return outbuf;
|
|
|
|
/* ERRORS */
|
|
short_nal:
|
|
{
|
|
GST_WARNING_OBJECT (depayload, "dropping short NAL");
|
|
gst_buffer_unmap (nal, &map);
|
|
gst_buffer_unref (nal);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
static GstBuffer *
|
|
gst_rtp_h264_push_fragmentation_unit (GstRtpH264Depay * rtph264depay,
|
|
gboolean send)
|
|
{
|
|
guint outsize;
|
|
GstMapInfo map;
|
|
GstBuffer *outbuf;
|
|
|
|
outsize = gst_adapter_available (rtph264depay->adapter);
|
|
outbuf = gst_adapter_take_buffer (rtph264depay->adapter, outsize);
|
|
|
|
gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
|
|
GST_DEBUG_OBJECT (rtph264depay, "output %d bytes", outsize);
|
|
|
|
if (rtph264depay->byte_stream) {
|
|
memcpy (map.data, sync_bytes, sizeof (sync_bytes));
|
|
} else {
|
|
outsize -= 4;
|
|
map.data[0] = (outsize >> 24);
|
|
map.data[1] = (outsize >> 16);
|
|
map.data[2] = (outsize >> 8);
|
|
map.data[3] = (outsize);
|
|
}
|
|
gst_buffer_unmap (outbuf, &map);
|
|
|
|
rtph264depay->current_fu_type = 0;
|
|
|
|
outbuf = gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf,
|
|
rtph264depay->fu_timestamp, rtph264depay->fu_marker);
|
|
|
|
if (send && outbuf) {
|
|
gst_rtp_base_depayload_push (GST_RTP_BASE_DEPAYLOAD (rtph264depay), outbuf);
|
|
outbuf = NULL;
|
|
}
|
|
return outbuf;
|
|
}
|
|
|
|
static GstBuffer *
|
|
gst_rtp_h264_depay_process (GstRTPBaseDepayload * depayload, GstBuffer * buf)
|
|
{
|
|
GstRtpH264Depay *rtph264depay;
|
|
GstBuffer *outbuf = NULL;
|
|
guint8 nal_unit_type;
|
|
GstRTPBuffer rtp = { NULL };
|
|
|
|
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;
|
|
rtph264depay->current_fu_type = 0;
|
|
}
|
|
|
|
{
|
|
gint payload_len;
|
|
guint8 *payload;
|
|
guint header_len;
|
|
guint8 nal_ref_idc;
|
|
GstMapInfo map;
|
|
guint outsize, nalu_size;
|
|
GstClockTime timestamp;
|
|
gboolean marker;
|
|
|
|
timestamp = GST_BUFFER_TIMESTAMP (buf);
|
|
|
|
gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp);
|
|
|
|
payload_len = gst_rtp_buffer_get_payload_len (&rtp);
|
|
payload = gst_rtp_buffer_get_payload (&rtp);
|
|
marker = gst_rtp_buffer_get_marker (&rtp);
|
|
|
|
GST_DEBUG_OBJECT (rtph264depay, "receiving %d bytes", payload_len);
|
|
|
|
if (payload_len == 0)
|
|
goto empty_packet;
|
|
|
|
/* +---------------+
|
|
* |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);
|
|
|
|
/* If FU unit was being processed, but the current nal is of a different
|
|
* type. Assume that the remote payloader is buggy (didn't set the end bit
|
|
* when the FU ended) and send out what we gathered thusfar */
|
|
if (G_UNLIKELY (rtph264depay->current_fu_type != 0 &&
|
|
nal_unit_type != rtph264depay->current_fu_type))
|
|
gst_rtp_h264_push_fragmentation_unit (rtph264depay, TRUE);
|
|
|
|
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];
|
|
|
|
/* dont include nalu_size */
|
|
if (nalu_size > (payload_len - 2))
|
|
nalu_size = payload_len - 2;
|
|
|
|
outsize = nalu_size + sizeof (sync_bytes);
|
|
outbuf = gst_buffer_new_and_alloc (outsize);
|
|
|
|
gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
|
|
if (rtph264depay->byte_stream) {
|
|
memcpy (map.data, sync_bytes, sizeof (sync_bytes));
|
|
} else {
|
|
map.data[0] = map.data[1] = 0;
|
|
map.data[2] = payload[0];
|
|
map.data[3] = payload[1];
|
|
}
|
|
|
|
/* strip NALU size */
|
|
payload += 2;
|
|
payload_len -= 2;
|
|
|
|
memcpy (map.data + sizeof (sync_bytes), payload, nalu_size);
|
|
gst_buffer_unmap (outbuf, &map);
|
|
|
|
outbuf =
|
|
gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf, timestamp,
|
|
marker);
|
|
if (outbuf)
|
|
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);
|
|
|
|
outbuf = gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf, timestamp,
|
|
marker);
|
|
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;
|
|
|
|
/* If a new FU unit started, while still processing an older one.
|
|
* Assume that the remote payloader is buggy (doesn't set the end
|
|
* bit) and send out what we've gathered thusfar */
|
|
if (G_UNLIKELY (rtph264depay->current_fu_type != 0))
|
|
gst_rtp_h264_push_fragmentation_unit (rtph264depay, TRUE);
|
|
|
|
rtph264depay->current_fu_type = nal_unit_type;
|
|
rtph264depay->fu_timestamp = timestamp;
|
|
|
|
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);
|
|
|
|
gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
|
|
memcpy (map.data + sizeof (sync_bytes), payload, nalu_size);
|
|
map.data[sizeof (sync_bytes)] = nal_header;
|
|
gst_buffer_unmap (outbuf, &map);
|
|
|
|
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);
|
|
gst_buffer_fill (outbuf, 0, payload, outsize);
|
|
|
|
GST_DEBUG_OBJECT (rtph264depay, "queueing %d bytes", outsize);
|
|
|
|
/* and assemble in the adapter */
|
|
gst_adapter_push (rtph264depay->adapter, outbuf);
|
|
}
|
|
|
|
outbuf = NULL;
|
|
rtph264depay->fu_marker = marker;
|
|
|
|
/* if NAL unit ends, flush the adapter */
|
|
if (E)
|
|
outbuf = gst_rtp_h264_push_fragmentation_unit (rtph264depay, FALSE);
|
|
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);
|
|
|
|
gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
|
|
if (rtph264depay->byte_stream) {
|
|
memcpy (map.data, sync_bytes, sizeof (sync_bytes));
|
|
} else {
|
|
map.data[0] = map.data[1] = 0;
|
|
map.data[2] = nalu_size >> 8;
|
|
map.data[3] = nalu_size & 0xff;
|
|
}
|
|
memcpy (map.data + sizeof (sync_bytes), payload, nalu_size);
|
|
gst_buffer_unmap (outbuf, &map);
|
|
|
|
outbuf = gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf, timestamp,
|
|
marker);
|
|
break;
|
|
}
|
|
}
|
|
gst_rtp_buffer_unmap (&rtp);
|
|
}
|
|
|
|
return outbuf;
|
|
|
|
/* ERRORS */
|
|
empty_packet:
|
|
{
|
|
GST_DEBUG_OBJECT (rtph264depay, "empty packet");
|
|
gst_rtp_buffer_unmap (&rtp);
|
|
return NULL;
|
|
}
|
|
undefined_type:
|
|
{
|
|
GST_ELEMENT_WARNING (rtph264depay, STREAM, DECODE,
|
|
(NULL), ("Undefined packet type"));
|
|
gst_rtp_buffer_unmap (&rtp);
|
|
return NULL;
|
|
}
|
|
waiting_start:
|
|
{
|
|
GST_DEBUG_OBJECT (rtph264depay, "waiting for start");
|
|
gst_rtp_buffer_unmap (&rtp);
|
|
return NULL;
|
|
}
|
|
not_implemented:
|
|
{
|
|
GST_ELEMENT_ERROR (rtph264depay, STREAM, FORMAT,
|
|
(NULL), ("NAL unit type %d not supported yet", nal_unit_type));
|
|
gst_rtp_buffer_unmap (&rtp);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
static gboolean
|
|
gst_rtp_h264_depay_handle_event (GstRTPBaseDepayload * depay, GstEvent * event)
|
|
{
|
|
GstRtpH264Depay *rtph264depay;
|
|
|
|
rtph264depay = GST_RTP_H264_DEPAY (depay);
|
|
|
|
switch (GST_EVENT_TYPE (event)) {
|
|
case GST_EVENT_FLUSH_STOP:
|
|
gst_rtp_h264_depay_reset (rtph264depay);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return
|
|
GST_RTP_BASE_DEPAYLOAD_CLASS (parent_class)->handle_event (depay, event);
|
|
}
|
|
|
|
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_rtp_h264_depay_reset (rtph264depay);
|
|
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)
|
|
{
|
|
GST_DEBUG_CATEGORY_INIT (rtph264depay_debug, "rtph264depay", 0,
|
|
"H264 Video RTP Depayloader");
|
|
|
|
return gst_element_register (plugin, "rtph264depay",
|
|
GST_RANK_SECONDARY, GST_TYPE_RTP_H264_DEPAY);
|
|
}
|