static gboolean gst_rtp_g729_depay_setcaps (GstBaseRTPDepayload * 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_BASE_RTP_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; } }