gst/rtp/: Added simple AC3 depayloader (RFC 4184).

Original commit message from CVS:
* gst/rtp/Makefile.am:
* gst/rtp/gstrtp.c: (plugin_init):
* gst/rtp/gstrtpac3depay.c: (gst_rtp_ac3_depay_base_init),
(gst_rtp_ac3_depay_class_init), (gst_rtp_ac3_depay_init),
(gst_rtp_ac3_depay_setcaps), (gst_rtp_ac3_depay_process),
(gst_rtp_ac3_depay_set_property), (gst_rtp_ac3_depay_get_property),
(gst_rtp_ac3_depay_change_state), (gst_rtp_ac3_depay_plugin_init):
* gst/rtp/gstrtpac3depay.h:
Added simple AC3 depayloader (RFC 4184).
* gst/rtp/gstrtpmp2tdepay.c: (gst_rtp_mp2t_depay_setcaps):
Fix a leak.

1 files changed, 325 insertions, 0 deletions

diff --git a/gst/rtp/gstrtpac3depay.c b/gst/rtp/gstrtpac3depay.c
new file mode 100644
index 00000000..2cb52b65
--- /dev/null
+++ b/gst/rtp/gstrtpac3depay.c
@@ -0,0 +1,325 @@
+/* GStreamer
+ * Copyright (C) <2007> 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 details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
+#include <gst/rtp/gstrtpbuffer.h>
+
+#include <string.h>
+#include "gstrtpac3depay.h"
+
+GST_DEBUG_CATEGORY_STATIC (rtpac3depay_debug);
+#define GST_CAT_DEFAULT (rtpac3depay_debug)
+
+/* elementfactory information */
+static const GstElementDetails gst_rtp_ac3depay_details =
+GST_ELEMENT_DETAILS ("RTP packet depayloader",
+    "Codec/Depayloader/Network",
+    "Extracts AC3 audio from RTP packets (RFC 4184)",
+    "Wim Taymans <wim@fluendo.com>");
+
+/* RtpAC3Depay signals and args */
+enum
+{
+  /* FILL ME */
+  LAST_SIGNAL
+};
+
+enum
+{
+  ARG_0,
+};
+
+static GstStaticPadTemplate gst_rtp_ac3_depay_src_template =
+GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("audio/ac3")
+    );
+
+static GstStaticPadTemplate gst_rtp_ac3_depay_sink_template =
+GST_STATIC_PAD_TEMPLATE ("sink",
+    GST_PAD_SINK,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("application/x-rtp, "
+        "media = (string) \"audio\", "
+        "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
+        "clock-rate = (int) { 32000, 44100, 48000 }, "
+        "encoding-name = (string) \"AC3\"")
+    );
+
+GST_BOILERPLATE (GstRtpAC3Depay, gst_rtp_ac3_depay, GstBaseRTPDepayload,
+    GST_TYPE_BASE_RTP_DEPAYLOAD);
+
+static gboolean gst_rtp_ac3_depay_setcaps (GstBaseRTPDepayload * depayload,
+    GstCaps * caps);
+static GstBuffer *gst_rtp_ac3_depay_process (GstBaseRTPDepayload * depayload,
+    GstBuffer * buf);
+
+static void gst_rtp_ac3_depay_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec);
+static void gst_rtp_ac3_depay_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec);
+
+static GstStateChangeReturn gst_rtp_ac3_depay_change_state (GstElement *
+    element, GstStateChange transition);
+
+static void
+gst_rtp_ac3_depay_base_init (gpointer klass)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
+
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&gst_rtp_ac3_depay_src_template));
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&gst_rtp_ac3_depay_sink_template));
+
+  gst_element_class_set_details (element_class, &gst_rtp_ac3depay_details);
+}
+
+static void
+gst_rtp_ac3_depay_class_init (GstRtpAC3DepayClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+  GstBaseRTPDepayloadClass *gstbasertpdepayload_class;
+
+  gobject_class = (GObjectClass *) klass;
+  gstelement_class = (GstElementClass *) klass;
+  gstbasertpdepayload_class = (GstBaseRTPDepayloadClass *) klass;
+
+  parent_class = g_type_class_peek_parent (klass);
+
+  gobject_class->set_property = gst_rtp_ac3_depay_set_property;
+  gobject_class->get_property = gst_rtp_ac3_depay_get_property;
+
+  gstelement_class->change_state = gst_rtp_ac3_depay_change_state;
+
+  gstbasertpdepayload_class->set_caps = gst_rtp_ac3_depay_setcaps;
+  gstbasertpdepayload_class->process = gst_rtp_ac3_depay_process;
+
+  GST_DEBUG_CATEGORY_INIT (rtpac3depay_debug, "rtpac3depay", 0,
+      "MPEG Audio RTP Depayloader");
+}
+
+static void
+gst_rtp_ac3_depay_init (GstRtpAC3Depay * rtpac3depay,
+    GstRtpAC3DepayClass * klass)
+{
+}
+
+static gboolean
+gst_rtp_ac3_depay_setcaps (GstBaseRTPDepayload * depayload, GstCaps * caps)
+{
+  GstStructure *structure;
+  GstRtpAC3Depay *rtpac3depay;
+  gint clock_rate = 90000;      /* default */
+
+  rtpac3depay = GST_RTP_AC3_DEPAY (depayload);
+
+  structure = gst_caps_get_structure (caps, 0);
+
+  gst_structure_get_int (structure, "clock-rate", &clock_rate);
+  depayload->clock_rate = clock_rate;
+
+  return TRUE;
+}
+
+struct frmsize_s
+{
+  guint16 bit_rate;
+  guint16 frm_size[3];
+};
+
+static const struct frmsize_s frmsizecod_tbl[] = {
+  {32, {64, 69, 96}},
+  {32, {64, 70, 96}},
+  {40, {80, 87, 120}},
+  {40, {80, 88, 120}},
+  {48, {96, 104, 144}},
+  {48, {96, 105, 144}},
+  {56, {112, 121, 168}},
+  {56, {112, 122, 168}},
+  {64, {128, 139, 192}},
+  {64, {128, 140, 192}},
+  {80, {160, 174, 240}},
+  {80, {160, 175, 240}},
+  {96, {192, 208, 288}},
+  {96, {192, 209, 288}},
+  {112, {224, 243, 336}},
+  {112, {224, 244, 336}},
+  {128, {256, 278, 384}},
+  {128, {256, 279, 384}},
+  {160, {320, 348, 480}},
+  {160, {320, 349, 480}},
+  {192, {384, 417, 576}},
+  {192, {384, 418, 576}},
+  {224, {448, 487, 672}},
+  {224, {448, 488, 672}},
+  {256, {512, 557, 768}},
+  {256, {512, 558, 768}},
+  {320, {640, 696, 960}},
+  {320, {640, 697, 960}},
+  {384, {768, 835, 1152}},
+  {384, {768, 836, 1152}},
+  {448, {896, 975, 1344}},
+  {448, {896, 976, 1344}},
+  {512, {1024, 1114, 1536}},
+  {512, {1024, 1115, 1536}},
+  {576, {1152, 1253, 1728}},
+  {576, {1152, 1254, 1728}},
+  {640, {1280, 1393, 1920}},
+  {640, {1280, 1394, 1920}}
+};
+
+static GstBuffer *
+gst_rtp_ac3_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
+{
+  GstRtpAC3Depay *rtpac3depay;
+  GstBuffer *outbuf;
+
+  rtpac3depay = GST_RTP_AC3_DEPAY (depayload);
+
+  if (!gst_rtp_buffer_validate (buf))
+    goto bad_packet;
+
+  {
+    gint payload_len;
+    guint8 *payload;
+    guint16 FT, NF;
+
+    payload_len = gst_rtp_buffer_get_payload_len (buf);
+    payload = gst_rtp_buffer_get_payload (buf);
+
+    if (payload_len <= 2)
+      goto empty_packet;
+
+    /* strip off header
+     *
+     *  0                   1
+     *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
+     * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+     * |    MBZ    | FT|       NF      |
+     * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+     */
+    FT = payload[0] & 0x3;
+    NF = payload[1];
+
+    GST_DEBUG_OBJECT (rtpac3depay, "FT: %d, NF: %d", FT, NF);
+
+    payload_len -= 2;
+    payload += 2;
+
+    /* We don't bother with fragmented packets yet */
+    outbuf = gst_rtp_buffer_get_payload_subbuffer (buf, 2, -1);
+
+    GST_DEBUG_OBJECT (rtpac3depay, "pushing buffer of size %d",
+        GST_BUFFER_SIZE (outbuf));
+
+    return outbuf;
+  }
+
+  return NULL;
+
+bad_packet:
+  {
+    GST_ELEMENT_WARNING (rtpac3depay, STREAM, DECODE,
+        ("Packet did not validate."), (NULL));
+    return NULL;
+  }
+#if 0
+bad_payload:
+  {
+    GST_ELEMENT_WARNING (rtpac3depay, STREAM, DECODE,
+        ("Unexpected payload type."), (NULL));
+    return NULL;
+  }
+#endif
+empty_packet:
+  {
+    GST_ELEMENT_WARNING (rtpac3depay, STREAM, DECODE,
+        ("Empty Payload."), (NULL));
+    return NULL;
+  }
+}
+
+static void
+gst_rtp_ac3_depay_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec)
+{
+  GstRtpAC3Depay *rtpac3depay;
+
+  rtpac3depay = GST_RTP_AC3_DEPAY (object);
+
+  switch (prop_id) {
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static void
+gst_rtp_ac3_depay_get_property (GObject * object, guint prop_id, GValue * value,
+    GParamSpec * pspec)
+{
+  GstRtpAC3Depay *rtpac3depay;
+
+  rtpac3depay = GST_RTP_AC3_DEPAY (object);
+
+  switch (prop_id) {
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static GstStateChangeReturn
+gst_rtp_ac3_depay_change_state (GstElement * element, GstStateChange transition)
+{
+  GstRtpAC3Depay *rtpac3depay;
+  GstStateChangeReturn ret;
+
+  rtpac3depay = GST_RTP_AC3_DEPAY (element);
+
+  switch (transition) {
+    case GST_STATE_CHANGE_NULL_TO_READY:
+      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_ac3_depay_plugin_init (GstPlugin * plugin)
+{
+  return gst_element_register (plugin, "rtpac3depay",
+      GST_RANK_MARGINAL, GST_TYPE_RTP_AC3_DEPAY);
+}