--- /dev/null
+/* GStreamer
+ * Copyright (C) <2006> 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 <string.h>
+
+#include <gst/rtp/gstrtpbuffer.h>
+#include "gstrtph264depay.h"
+
+/* elementfactory information */
+static const GstElementDetails gst_rtp_h264depay_details =
+GST_ELEMENT_DETAILS ("RTP packet parser",
+ "Codec/Depayr/Network",
+ "Extracts H264 video from RTP packets (RFC 3984)",
+ "Wim Taymans <wim@fluendo.com>");
+
+/* RtpH264Depay signals and args */
+enum
+{
+ /* FILL ME */
+ LAST_SIGNAL
+};
+
+enum
+{
+ ARG_0,
+ ARG_FREQUENCY
+};
+
+static GstStaticPadTemplate gst_rtp_h264_depay_src_template =
+GST_STATIC_PAD_TEMPLATE ("src",
+ GST_PAD_SRC,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS ("video/x-h264")
+ );
+
+static GstStaticPadTemplate gst_rtp_h264_depay_sink_template =
+GST_STATIC_PAD_TEMPLATE ("sink",
+ GST_PAD_SINK,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS ("application/x-rtp, "
+ "media = (string) \"video\", "
+ "clock-rate = (int) 90000, " "encoding-name = (string) \"H264\"")
+ /** optional parameters **/
+ /* "profile-level-id = (string) ANY, " */
+ /* "max-mbps = (string) ANY, " */
+ /* "max-fs = (string) ANY, " */
+ /* "max-cpb = (string) ANY, " */
+ /* "max-dpb = (string) ANY, " */
+ /* "max-br = (string) ANY, " */
+ /* "redundant-pic-cap = (string) { \"0\", \"1\" }, " */
+ /* "sprop-parameter-sets = (string) ANY, " */
+ /* "parameter-add = (string) { \"0\", \"1\" }, " */
+ /* "packetization-mode = (string) { \"0\", \"1\", \"2\" }, " */
+ /* "sprop-interleaving-depth = (string) ANY, " */
+ /* "sprop-deint-buf-req = (string) ANY, " */
+ /* "deint-buf-cap = (string) ANY, " */
+ /* "sprop-init-buf-time = (string) ANY, " */
+ /* "sprop-max-don-diff = (string) ANY, " */
+ /* "max-rcmd-nalu-size = (string) ANY " */
+ );
+
+GST_BOILERPLATE (GstRtpH264Depay, gst_rtp_h264_depay, GstBaseRTPDepayload,
+ GST_TYPE_BASE_RTP_DEPAYLOAD);
+
+static void gst_rtp_h264_depay_finalize (GObject * object);
+static void gst_rtp_h264_depay_set_property (GObject * object, guint prop_id,
+ const GValue * value, GParamSpec * pspec);
+static void gst_rtp_h264_depay_get_property (GObject * object, guint prop_id,
+ GValue * value, GParamSpec * pspec);
+
+static GstStateChangeReturn gst_rtp_h264_depay_change_state (GstElement *
+ element, GstStateChange transition);
+
+static GstBuffer *gst_rtp_h264_depay_process (GstBaseRTPDepayload * depayload,
+ GstBuffer * buf);
+static gboolean gst_rtp_h264_depay_setcaps (GstBaseRTPDepayload * filter,
+ GstCaps * caps);
+
+static void
+gst_rtp_h264_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_h264_depay_src_template));
+ gst_element_class_add_pad_template (element_class,
+ gst_static_pad_template_get (&gst_rtp_h264_depay_sink_template));
+
+ gst_element_class_set_details (element_class, &gst_rtp_h264depay_details);
+}
+
+static void
+gst_rtp_h264_depay_class_init (GstRtpH264DepayClass * 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);
+
+ gstbasertpdepayload_class->process = gst_rtp_h264_depay_process;
+ gstbasertpdepayload_class->set_caps = gst_rtp_h264_depay_setcaps;
+
+ gobject_class->finalize = gst_rtp_h264_depay_finalize;
+
+ gobject_class->set_property = gst_rtp_h264_depay_set_property;
+ gobject_class->get_property = gst_rtp_h264_depay_get_property;
+
+ gstelement_class->change_state = gst_rtp_h264_depay_change_state;
+}
+
+static void
+gst_rtp_h264_depay_init (GstRtpH264Depay * rtph264depay,
+ GstRtpH264DepayClass * klass)
+{
+ rtph264depay->adapter = gst_adapter_new ();
+}
+
+static void
+gst_rtp_h264_depay_finalize (GObject * object)
+{
+ GstRtpH264Depay *rtph264depay;
+
+ rtph264depay = GST_RTP_H264_DEPAY (object);
+
+ g_object_unref (rtph264depay->adapter);
+ rtph264depay->adapter = NULL;
+
+ G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static const guint8 a2bin[256] = {
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 62, 64, 64, 64, 63,
+ 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 64, 64, 64, 64, 64, 64,
+ 64, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
+ 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 64, 64, 64, 64, 64,
+ 64, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
+ 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 64, 64, 64, 64, 64,
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64
+};
+
+static guint
+decode_base64 (gchar * in, guint8 * out)
+{
+ guint8 v1, v2;
+ guint len = 0;
+
+ v1 = a2bin[(gint) * in];
+ while (v1 < 63) {
+ /* read 4 bytes, write 3 bytes, invalid base64 are zeroes */
+ v2 = a2bin[(gint) * ++in];
+ *out++ = (v1 << 2) | ((v2 & 0x3f) >> 4);
+ v1 = (v2 > 63 ? 64 : a2bin[(gint) * ++in]);
+ *out++ = (v2 << 4) | ((v1 & 0x3f) >> 2);
+ v2 = (v1 > 63 ? 64 : a2bin[(gint) * ++in]);
+ *out++ = (v1 << 6) | (v2 & 0x3f);
+ v1 = (v2 > 63 ? 64 : a2bin[(gint) * ++in]);
+ len += 3;
+ }
+ /* move to '\0' */
+ while (*in != '\0')
+ in++;
+
+ /* subtract padding */
+ while (len > 0 && *--in == '=')
+ len--;
+
+ return len;
+}
+
+static gboolean
+gst_rtp_h264_depay_setcaps (GstBaseRTPDepayload * filter, GstCaps * caps)
+{
+ GstCaps *srccaps = NULL;
+ gint clock_rate = 90000;
+ GstStructure *structure = gst_caps_get_structure (caps, 0);
+
+ if (gst_structure_has_field (structure, "clock-rate")) {
+ gst_structure_get_int (structure, "clock-rate", &clock_rate);
+ }
+
+ srccaps = gst_caps_new_simple ("video/x-h264", NULL);
+
+ if (gst_structure_has_field (structure, "sprop-parameter-sets")) {
+ const gchar *ps;
+ gchar **params;
+ guint len, total;
+ gint i;
+ GstBuffer *codec_data;
+ guint8 *b64;
+
+ /* Base64 encoded, comma separated config NALs */
+ ps = gst_structure_get_string (structure, "sprop-parameter-sets");
+ params = g_strsplit (ps, ",", 0);
+
+ /* count total number of bytes in base64 */
+ len = 0;
+ for (i = 0; params[i]; i++) {
+ len += strlen (params[i]);
+ }
+ /* we seriously overshoot the length, but it's fine. */
+ codec_data = gst_buffer_new_and_alloc (len);
+ b64 = GST_BUFFER_DATA (codec_data);
+
+ total = 0;
+ for (i = 0; params[i]; i++) {
+ *b64++ = 0;
+ *b64++ = 0;
+ *b64++ = 1;
+ len = decode_base64 (params[i], b64);
+ total += (len + 3);
+ b64 += len;
+ }
+ GST_BUFFER_SIZE (codec_data) = total;
+
+ gst_caps_set_simple (srccaps,
+ "codec_data", GST_TYPE_BUFFER, codec_data, NULL);
+ }
+
+ filter->clock_rate = clock_rate;
+
+ gst_pad_set_caps (filter->srcpad, srccaps);
+ gst_caps_unref (srccaps);
+
+ return TRUE;
+}
+
+static GstBuffer *
+gst_rtp_h264_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
+{
+
+ GstRtpH264Depay *rtph264depay;
+ GstBuffer *outbuf;
+
+ rtph264depay = GST_RTP_H264_DEPAY (depayload);
+
+ if (!gst_rtp_buffer_validate (buf))
+ goto bad_packet;
+
+ {
+ gint payload_len;
+ guint8 *payload;
+ guint header_len;
+ guint8 nal_ref_idc, nal_unit_type;
+
+ payload_len = gst_rtp_buffer_get_payload_len (buf);
+ payload = gst_rtp_buffer_get_payload (buf);
+
+ /* +---------------+
+ * |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;
+
+ 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 24:
+ /* STAP-A Single-time aggregation packet 5.7.1 */
+ header_len = 1;
+ break;
+ case 25:
+ /* STAP-B Single-time aggregation packet 5.7.1 */
+ case 26:
+ /* MTAP16 Multi-time aggregation packet 5.7.2 */
+ case 27:
+ /* MTAP24 Multi-time aggregation packet 5.7.2 */
+ header_len = 3;
+ 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 (S) {
+ /* NAL unit starts here */
+ guint8 *outdata;
+ guint outsize;
+
+ outsize = payload_len - 1;
+
+ outbuf = gst_buffer_new_and_alloc (outsize + 3);
+ outdata = GST_BUFFER_DATA (outbuf);
+ memcpy (outdata + 3, payload + 1, outsize);
+ /* reconstruct NAL header */
+ outdata[0] = 0x00;
+ outdata[1] = 0x00;
+ outdata[2] = 0x01;
+ outdata[3] = (payload[0] & 0xe0) | (payload[1] & 0x1f);
+
+ /* and assemble in the adapter */
+ gst_adapter_push (rtph264depay->adapter, outbuf);
+ } else {
+ /* NAL unit data */
+ guint outsize;
+ guint8 *outdata;
+
+ /* strip off 2 header bytes */
+ outsize = payload_len - 2;
+
+ outbuf = gst_buffer_new_and_alloc (outsize);
+ outdata = GST_BUFFER_DATA (outbuf);
+ memcpy (outdata, payload + 2, outsize);
+
+ /* and assemble in the adapter */
+ gst_adapter_push (rtph264depay->adapter, outbuf);
+ }
+
+ /* if NAL unit ends, flush the adapter */
+ if (E) {
+ guint outsize;
+ guint8 *outdata;
+
+ outsize = gst_adapter_available (rtph264depay->adapter);
+ outdata = gst_adapter_take (rtph264depay->adapter, outsize);
+
+ outbuf = gst_buffer_new ();
+ GST_BUFFER_SIZE (outbuf) = outsize;
+ GST_BUFFER_DATA (outbuf) = outdata;
+ GST_BUFFER_MALLOCDATA (outbuf) = outdata;
+
+ gst_buffer_set_caps (outbuf,
+ (GstCaps *) gst_pad_get_pad_template_caps (depayload->srcpad));
+
+ GST_DEBUG_OBJECT (rtph264depay, "output %d bytes", outsize);
+
+ return outbuf;
+ }
+ break;
+ }
+ default:
+ {
+ guint outsize;
+ guint8 *outdata;
+
+ /* 1-23 NAL unit Single NAL unit packet per H.264 5.6 */
+ /* the entire payload is the output buffer */
+ outsize = payload_len + 3;
+ outbuf = gst_buffer_new_and_alloc (outsize);
+ outdata = GST_BUFFER_DATA (outbuf);
+ outdata[0] = 0;
+ outdata[1] = 0;
+ outdata[2] = 1;
+ memcpy (&outdata[3], payload, payload_len);
+
+ gst_buffer_set_caps (outbuf,
+ (GstCaps *) gst_pad_get_pad_template_caps (depayload->srcpad));
+
+ return outbuf;
+ }
+ }
+ }
+
+ return NULL;
+
+ /* ERRORS */
+bad_packet:
+ {
+ GST_ELEMENT_WARNING (rtph264depay, STREAM, DECODE,
+ ("Packet did not validate"), (NULL));
+ return NULL;
+ }
+undefined_type:
+ {
+ GST_ELEMENT_WARNING (rtph264depay, STREAM, DECODE,
+ ("Undefined packet type"), (NULL));
+ return NULL;
+ }
+}
+
+static void
+gst_rtp_h264_depay_set_property (GObject * object, guint prop_id,
+ const GValue * value, GParamSpec * pspec)
+{
+ GstRtpH264Depay *rtph264depay;
+
+ rtph264depay = GST_RTP_H264_DEPAY (object);
+
+ switch (prop_id) {
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+static void
+gst_rtp_h264_depay_get_property (GObject * object, guint prop_id,
+ GValue * value, GParamSpec * pspec)
+{
+ GstRtpH264Depay *rtph264depay;
+
+ rtph264depay = GST_RTP_H264_DEPAY (object);
+
+ switch (prop_id) {
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+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);
+ 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_NONE, GST_TYPE_RTP_H264_DEPAY);
+}
projects / platform / upstream / gstreamer.git / commitdiff