--- /dev/null
+/* 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);
+}
projects / platform / upstream / gst-plugins-good.git / commitdiff