gst/rtp/: Added mpeg4 video payload encoder/decoder.

Original commit message from CVS:
* gst/rtp/Makefile.am:
* gst/rtp/gstrtp.c: (plugin_init):
* gst/rtp/gstrtpmp4vdec.c: (gst_rtpmp4vdec_get_type),
(gst_rtpmp4vdec_base_init), (gst_rtpmp4vdec_class_init),
(gst_rtpmp4vdec_init), (gst_rtpmp4vdec_setcaps),
(gst_rtpmp4vdec_chain), (gst_rtpmp4vdec_set_property),
(gst_rtpmp4vdec_get_property), (gst_rtpmp4vdec_change_state),
(gst_rtpmp4vdec_plugin_init):
* gst/rtp/gstrtpmp4vdec.h:
* gst/rtp/gstrtpmp4venc.c: (gst_rtpmp4venc_get_type),
(gst_rtpmp4venc_base_init), (gst_rtpmp4venc_class_init),
(gst_rtpmp4venc_init), (gst_rtpmp4venc_setcaps),
(gst_rtpmp4venc_flush), (gst_rtpmp4venc_chain),
(gst_rtpmp4venc_set_property), (gst_rtpmp4venc_get_property),
(gst_rtpmp4venc_change_state), (gst_rtpmp4venc_plugin_init):
* gst/rtp/gstrtpmp4venc.h:
* gst/rtp/gstrtpmpadec.c: (gst_rtpmpadec_chain):
* gst/rtp/gstrtpmpaenc.c: (gst_rtpmpaenc_flush):
Added mpeg4 video payload encoder/decoder.
Added some docs in mpa payloader.

1 files changed, 385 insertions, 0 deletions

diff --git a/gst/rtp/gstrtpmp4vpay.c b/gst/rtp/gstrtpmp4vpay.c
new file mode 100644
index 00000000..13b1e33d
--- /dev/null
+++ b/gst/rtp/gstrtpmp4vpay.c
@@ -0,0 +1,385 @@
+/* GStreamer
+ * Copyright (C) <2005> Wim Taymans <wim@fluendo.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more 
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
+#include <string.h>
+
+#include <gst/rtp/gstrtpbuffer.h>
+
+#include "gstrtpmp4venc.h"
+
+/* elementfactory information */
+static GstElementDetails gst_rtp_mp4venc_details = {
+  "RTP packet parser",
+  "Codec/Parser/Network",
+  "Encode MPEG4 video as RTP packets (RFC 3016)",
+  "Wim Taymans <wim@fluendo.com>"
+};
+
+/* RtpMP4VEnc signals and args */
+enum
+{
+  /* FILL ME */
+  LAST_SIGNAL
+};
+
+#define DEFAULT_MTU	1024
+#define DEFAULT_PT      96
+#define DEFAULT_SSRC    0
+
+enum
+{
+  PROP_0,
+  PROP_MTU,
+  PROP_PT,
+  PROP_SSRC
+};
+
+static GstStaticPadTemplate gst_rtpmp4venc_sink_template =
+GST_STATIC_PAD_TEMPLATE ("sink",
+    GST_PAD_SINK,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("video/mpeg,"
+        "mpegversion=(int) 4," "systemstream=(boolean)false")
+    );
+
+static GstStaticPadTemplate gst_rtpmp4venc_src_template =
+GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("application/x-rtp,"
+        "rate=(int) [1, MAX]," "profile-level-id=[1,MAX]"
+        /* "config=" */
+    )
+    );
+
+
+static void gst_rtpmp4venc_class_init (GstRtpMP4VEncClass * klass);
+static void gst_rtpmp4venc_base_init (GstRtpMP4VEncClass * klass);
+static void gst_rtpmp4venc_init (GstRtpMP4VEnc * rtpmp4venc);
+
+static gboolean gst_rtpmp4venc_setcaps (GstPad * pad, GstCaps * caps);
+static GstFlowReturn gst_rtpmp4venc_chain (GstPad * pad, GstBuffer * buffer);
+
+static void gst_rtpmp4venc_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec);
+static void gst_rtpmp4venc_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec);
+
+static GstStateChangeReturn gst_rtpmp4venc_change_state (GstElement * element,
+    GstStateChange transition);
+
+static GstElementClass *parent_class = NULL;
+
+static GType
+gst_rtpmp4venc_get_type (void)
+{
+  static GType rtpmp4venc_type = 0;
+
+  if (!rtpmp4venc_type) {
+    static const GTypeInfo rtpmp4venc_info = {
+      sizeof (GstRtpMP4VEncClass),
+      (GBaseInitFunc) gst_rtpmp4venc_base_init,
+      NULL,
+      (GClassInitFunc) gst_rtpmp4venc_class_init,
+      NULL,
+      NULL,
+      sizeof (GstRtpMP4VEnc),
+      0,
+      (GInstanceInitFunc) gst_rtpmp4venc_init,
+    };
+
+    rtpmp4venc_type =
+        g_type_register_static (GST_TYPE_ELEMENT, "GstRtpMP4VEnc",
+        &rtpmp4venc_info, 0);
+  }
+  return rtpmp4venc_type;
+}
+
+static void
+gst_rtpmp4venc_base_init (GstRtpMP4VEncClass * klass)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
+
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&gst_rtpmp4venc_src_template));
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&gst_rtpmp4venc_sink_template));
+
+  gst_element_class_set_details (element_class, &gst_rtp_mp4venc_details);
+}
+
+static void
+gst_rtpmp4venc_class_init (GstRtpMP4VEncClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+
+  gobject_class = (GObjectClass *) klass;
+  gstelement_class = (GstElementClass *) klass;
+
+  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
+
+  gobject_class->set_property = gst_rtpmp4venc_set_property;
+  gobject_class->get_property = gst_rtpmp4venc_get_property;
+
+  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_MTU,
+      g_param_spec_uint ("mtu", "MTU",
+          "Maximum size of one packet",
+          28, G_MAXUINT, DEFAULT_MTU, G_PARAM_READWRITE));
+  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_PT,
+      g_param_spec_uint ("pt", "payload type",
+          "The payload type of the packets",
+          0, 0x80, DEFAULT_PT, G_PARAM_READWRITE));
+  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SSRC,
+      g_param_spec_uint ("ssrc", "SSRC",
+          "The SSRC of the packets",
+          0, G_MAXUINT, DEFAULT_SSRC, G_PARAM_READWRITE));
+
+  gstelement_class->change_state = gst_rtpmp4venc_change_state;
+}
+
+static void
+gst_rtpmp4venc_init (GstRtpMP4VEnc * rtpmp4venc)
+{
+  rtpmp4venc->srcpad =
+      gst_pad_new_from_template (gst_static_pad_template_get
+      (&gst_rtpmp4venc_src_template), "src");
+  gst_element_add_pad (GST_ELEMENT (rtpmp4venc), rtpmp4venc->srcpad);
+
+  rtpmp4venc->sinkpad =
+      gst_pad_new_from_template (gst_static_pad_template_get
+      (&gst_rtpmp4venc_sink_template), "sink");
+  gst_pad_set_setcaps_function (rtpmp4venc->sinkpad, gst_rtpmp4venc_setcaps);
+  gst_pad_set_chain_function (rtpmp4venc->sinkpad, gst_rtpmp4venc_chain);
+  gst_element_add_pad (GST_ELEMENT (rtpmp4venc), rtpmp4venc->sinkpad);
+
+  rtpmp4venc->adapter = gst_adapter_new ();
+  rtpmp4venc->mtu = DEFAULT_MTU;
+  rtpmp4venc->pt = DEFAULT_PT;
+  rtpmp4venc->ssrc = DEFAULT_SSRC;
+  rtpmp4venc->rate = 90000;
+  rtpmp4venc->profile = 1;
+}
+
+static gboolean
+gst_rtpmp4venc_setcaps (GstPad * pad, GstCaps * caps)
+{
+  GstRtpMP4VEnc *rtpmp4venc;
+  GstCaps *srccaps;
+
+  rtpmp4venc = GST_RTP_MP4V_ENC (gst_pad_get_parent (pad));
+
+  srccaps = gst_caps_new_simple ("application/x-rtp",
+      "rate", G_TYPE_INT, rtpmp4venc->rate,
+      "profile-level-id", G_TYPE_INT, rtpmp4venc->profile, NULL);
+  gst_pad_set_caps (rtpmp4venc->srcpad, srccaps);
+  gst_caps_unref (srccaps);
+
+  gst_object_unref (rtpmp4venc);
+
+  return TRUE;
+}
+
+static GstFlowReturn
+gst_rtpmp4venc_flush (GstRtpMP4VEnc * rtpmp4venc)
+{
+  guint avail;
+  GstBuffer *outbuf;
+  GstFlowReturn ret;
+  guint16 frag_offset;
+
+  /* the data available in the adapter is either smaller
+   * than the MTU or bigger. In the case it is smaller, the complete
+   * adapter contents can be put in one packet. In the case the
+   * adapter has more than one MTU, we need to split the MP4V data
+   * over multiple packets. */
+  avail = gst_adapter_available (rtpmp4venc->adapter);
+
+  ret = GST_FLOW_OK;
+
+  frag_offset = 0;
+  while (avail > 0) {
+    guint towrite;
+    guint8 *payload;
+    guint8 *data;
+    guint payload_len;
+    guint packet_len;
+
+    /* this will be the total lenght of the packet */
+    packet_len = gst_rtpbuffer_calc_packet_len (avail, 0, 0);
+
+    /* fill one MTU or all available bytes */
+    towrite = MIN (packet_len, rtpmp4venc->mtu);
+
+    /* this is the payload length */
+    payload_len = gst_rtpbuffer_calc_payload_len (towrite, 0, 0);
+
+    /* create buffer to hold the payload */
+    outbuf = gst_rtpbuffer_new_allocate (payload_len, 0, 0);
+    gst_buffer_set_caps (outbuf, GST_PAD_CAPS (rtpmp4venc->srcpad));
+
+    /* set timestamp */
+    if (GST_CLOCK_TIME_IS_VALID (rtpmp4venc->first_ts)) {
+      gst_rtpbuffer_set_timestamp (outbuf,
+          rtpmp4venc->first_ts * 90000 / GST_SECOND);
+    }
+    gst_rtpbuffer_set_payload_type (outbuf, rtpmp4venc->pt);
+    gst_rtpbuffer_set_seq (outbuf, rtpmp4venc->seqnum++);
+
+    payload = gst_rtpbuffer_get_payload (outbuf);
+
+    data = (guint8 *) gst_adapter_peek (rtpmp4venc->adapter, payload_len);
+    memcpy (payload, data, payload_len);
+    gst_adapter_flush (rtpmp4venc->adapter, payload_len);
+
+    avail -= payload_len;
+    frag_offset += payload_len;
+
+    gst_rtpbuffer_set_marker (outbuf, avail == 0);
+
+    GST_BUFFER_TIMESTAMP (outbuf) = rtpmp4venc->first_ts;
+
+    ret = gst_pad_push (rtpmp4venc->srcpad, outbuf);
+  }
+
+  return ret;
+}
+
+/* we expect buffers starting on startcodes. 
+ *
+ * FIXME, need to flush the adapter if we receive non VOP
+ * packets. 
+ */
+static GstFlowReturn
+gst_rtpmp4venc_chain (GstPad * pad, GstBuffer * buffer)
+{
+  GstRtpMP4VEnc *rtpmp4venc;
+  GstFlowReturn ret;
+  guint size, avail;
+  guint packet_len;
+
+  rtpmp4venc = GST_RTP_MP4V_ENC (gst_pad_get_parent (pad));
+
+  size = GST_BUFFER_SIZE (buffer);
+  avail = gst_adapter_available (rtpmp4venc->adapter);
+
+  /* get packet length of previous data and this new data */
+  packet_len = gst_rtpbuffer_calc_packet_len (avail + size, 0, 0);
+
+  /* if this buffer is going to overflow the packet, flush what we
+   * have. */
+  if (packet_len > rtpmp4venc->mtu) {
+    ret = gst_rtpmp4venc_flush (rtpmp4venc);
+    avail = 0;
+  }
+
+  gst_adapter_push (rtpmp4venc->adapter, buffer);
+
+  if (avail == 0) {
+    rtpmp4venc->first_ts = GST_BUFFER_TIMESTAMP (buffer);
+  }
+  gst_object_unref (rtpmp4venc);
+
+  ret = GST_FLOW_OK;
+
+  return ret;
+}
+
+static void
+gst_rtpmp4venc_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec)
+{
+  GstRtpMP4VEnc *rtpmp4venc;
+
+  rtpmp4venc = GST_RTP_MP4V_ENC (object);
+
+  switch (prop_id) {
+    case PROP_MTU:
+      rtpmp4venc->mtu = g_value_get_uint (value);
+      break;
+    case PROP_PT:
+      rtpmp4venc->pt = g_value_get_uint (value);
+      break;
+    case PROP_SSRC:
+      rtpmp4venc->ssrc = g_value_get_uint (value);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static void
+gst_rtpmp4venc_get_property (GObject * object, guint prop_id, GValue * value,
+    GParamSpec * pspec)
+{
+  GstRtpMP4VEnc *rtpmp4venc;
+
+  rtpmp4venc = GST_RTP_MP4V_ENC (object);
+
+  switch (prop_id) {
+    case PROP_MTU:
+      g_value_set_uint (value, rtpmp4venc->mtu);
+      break;
+    case PROP_PT:
+      g_value_set_uint (value, rtpmp4venc->pt);
+      break;
+    case PROP_SSRC:
+      g_value_set_uint (value, rtpmp4venc->ssrc);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static GstStateChangeReturn
+gst_rtpmp4venc_change_state (GstElement * element, GstStateChange transition)
+{
+  GstRtpMP4VEnc *rtpmp4venc;
+  GstStateChangeReturn ret;
+
+  rtpmp4venc = GST_RTP_MP4V_ENC (element);
+
+  switch (transition) {
+    case GST_STATE_CHANGE_NULL_TO_READY:
+      break;
+    case GST_STATE_CHANGE_READY_TO_PAUSED:
+      rtpmp4venc->seqnum = 0;
+      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_rtpmp4venc_plugin_init (GstPlugin * plugin)
+{
+  return gst_element_register (plugin, "rtpmp4venc",
+      GST_RANK_NONE, GST_TYPE_RTP_MP4V_ENC);
+}