diff options
Diffstat (limited to 'gst/rtp/gstrtpg729depay.c')
| -rwxr-xr-x | gst/rtp/gstrtpg729depay.c | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/gst/rtp/gstrtpg729depay.c b/gst/rtp/gstrtpg729depay.c new file mode 100755 index 0000000..9910add --- /dev/null +++ b/gst/rtp/gstrtpg729depay.c @@ -0,0 +1,226 @@ +/* GStreamer + * + * 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., 51 Franklin St, Fifth Floor, + * Boston, MA 02110-1301, USA. + */ + +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif + +#include <gst/rtp/gstrtpbuffer.h> + +#include <stdlib.h> +#include <string.h> +#include "gstrtpg729depay.h" + +GST_DEBUG_CATEGORY_STATIC (rtpg729depay_debug); +#define GST_CAT_DEFAULT (rtpg729depay_debug) + + +/* references: + * + * RFC 3551 (4.5.6) + */ + +enum +{ + /* FILL ME */ + LAST_SIGNAL +}; + +enum +{ + PROP_0 +}; + +/* input is an RTP packet + * + */ +static GstStaticPadTemplate gst_rtp_g729_depay_sink_template = + GST_STATIC_PAD_TEMPLATE ("sink", + GST_PAD_SINK, + GST_PAD_ALWAYS, + GST_STATIC_CAPS ("application/x-rtp, " + "media = (string) \"audio\", " + "clock-rate = (int) 8000, " + "encoding-name = (string) \"G729\"; " + "application/x-rtp, " + "media = (string) \"audio\", " + "payload = (int) " GST_RTP_PAYLOAD_G729_STRING ", " + "clock-rate = (int) 8000") + ); + +static GstStaticPadTemplate gst_rtp_g729_depay_src_template = +GST_STATIC_PAD_TEMPLATE ("src", + GST_PAD_SRC, + GST_PAD_ALWAYS, + GST_STATIC_CAPS ("audio/G729, " "channels = (int) 1," "rate = (int) 8000") + ); + +static gboolean gst_rtp_g729_depay_setcaps (GstRTPBaseDepayload * depayload, + GstCaps * caps); +static GstBuffer *gst_rtp_g729_depay_process (GstRTPBaseDepayload * depayload, + GstBuffer * buf); + +#define gst_rtp_g729_depay_parent_class parent_class +G_DEFINE_TYPE (GstRtpG729Depay, gst_rtp_g729_depay, + GST_TYPE_RTP_BASE_DEPAYLOAD); + +static void +gst_rtp_g729_depay_class_init (GstRtpG729DepayClass * klass) +{ + GstElementClass *gstelement_class; + GstRTPBaseDepayloadClass *gstrtpbasedepayload_class; + + GST_DEBUG_CATEGORY_INIT (rtpg729depay_debug, "rtpg729depay", 0, + "G.729 RTP Depayloader"); + + gstelement_class = (GstElementClass *) klass; + gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass; + + gst_element_class_add_pad_template (gstelement_class, + gst_static_pad_template_get (&gst_rtp_g729_depay_src_template)); + gst_element_class_add_pad_template (gstelement_class, + gst_static_pad_template_get (&gst_rtp_g729_depay_sink_template)); + + gst_element_class_set_static_metadata (gstelement_class, + "RTP G.729 depayloader", "Codec/Depayloader/Network/RTP", + "Extracts G.729 audio from RTP packets (RFC 3551)", + "Laurent Glayal <spglegle@yahoo.fr>"); + + gstrtpbasedepayload_class->process = gst_rtp_g729_depay_process; + gstrtpbasedepayload_class->set_caps = gst_rtp_g729_depay_setcaps; +} + +static void +gst_rtp_g729_depay_init (GstRtpG729Depay * rtpg729depay) +{ + GstRTPBaseDepayload *depayload; + + depayload = GST_RTP_BASE_DEPAYLOAD (rtpg729depay); + + gst_pad_use_fixed_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depayload)); +} + +static gboolean +gst_rtp_g729_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps) +{ + GstStructure *structure; + GstCaps *srccaps; + GstRtpG729Depay *rtpg729depay; + const gchar *params; + gint clock_rate, channels; + gboolean ret; + + rtpg729depay = GST_RTP_G729_DEPAY (depayload); + + structure = gst_caps_get_structure (caps, 0); + + if (!(params = gst_structure_get_string (structure, "encoding-params"))) + channels = 1; + else { + channels = atoi (params); + } + + if (!gst_structure_get_int (structure, "clock-rate", &clock_rate)) + clock_rate = 8000; + + if (channels != 1) + goto wrong_channels; + + if (clock_rate != 8000) + goto wrong_clock_rate; + + depayload->clock_rate = clock_rate; + + srccaps = gst_caps_new_simple ("audio/G729", + "channels", G_TYPE_INT, channels, "rate", G_TYPE_INT, clock_rate, NULL); + ret = gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depayload), srccaps); + gst_caps_unref (srccaps); + + return ret; + + /* ERRORS */ +wrong_channels: + { + GST_DEBUG_OBJECT (rtpg729depay, "expected 1 channel, got %d", channels); + return FALSE; + } +wrong_clock_rate: + { + GST_DEBUG_OBJECT (rtpg729depay, "expected 8000 clock-rate, got %d", + clock_rate); + return FALSE; + } +} + +static GstBuffer * +gst_rtp_g729_depay_process (GstRTPBaseDepayload * depayload, GstBuffer * buf) +{ + GstRtpG729Depay *rtpg729depay; + GstBuffer *outbuf = NULL; + gint payload_len; + gboolean marker; + GstRTPBuffer rtp = { NULL }; + + rtpg729depay = GST_RTP_G729_DEPAY (depayload); + + gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp); + + payload_len = gst_rtp_buffer_get_payload_len (&rtp); + + /* At least 2 bytes (CNG from G729 Annex B) */ + if (payload_len < 2) { + GST_ELEMENT_WARNING (rtpg729depay, STREAM, DECODE, + (NULL), ("G729 RTP payload too small (%d)", payload_len)); + goto bad_packet; + } + + GST_LOG_OBJECT (rtpg729depay, "payload len %d", payload_len); + + if ((payload_len % 10) == 2) { + GST_LOG_OBJECT (rtpg729depay, "G729 payload contains CNG frame"); + } + + outbuf = gst_rtp_buffer_get_payload_buffer (&rtp); + marker = gst_rtp_buffer_get_marker (&rtp); + + gst_rtp_buffer_unmap (&rtp); + + if (marker) { + /* marker bit starts talkspurt */ + GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_RESYNC); + } + + GST_LOG_OBJECT (depayload, "pushing buffer of size %" G_GSIZE_FORMAT, + gst_buffer_get_size (outbuf)); + + return outbuf; + + /* ERRORS */ +bad_packet: + { + /* no fatal error */ + return NULL; + } +} + +gboolean +gst_rtp_g729_depay_plugin_init (GstPlugin * plugin) +{ + return gst_element_register (plugin, "rtpg729depay", + GST_RANK_SECONDARY, GST_TYPE_RTP_G729_DEPAY); +} |