static gboolean
gst_rtp_g723_depay_setcaps (GstBaseRTPDepayload * depayload, GstCaps * caps)
{
GstStructure *structure;
GstCaps *srccaps;
GstRtpG723Depay *rtpg723depay;
const gchar *params;
gint clock_rate, channels;
gboolean ret;
rtpg723depay = GST_RTP_G723_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/G723",
"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 (rtpg723depay, "expected 1 channel, got %d", channels);
return FALSE;
}
wrong_clock_rate:
{
GST_DEBUG_OBJECT (rtpg723depay, "expected 8000 clock-rate, got %d",
clock_rate);
return FALSE;
}
}
static GstBuffer *
gst_rtp_g723_depay_process (GstRTPBaseDepayload * depayload, GstBuffer * buf)
{
GstRtpG723Depay *rtpg723depay;
GstBuffer *outbuf = NULL;
gint payload_len;
gboolean marker;
GstRTPBuffer rtp = { NULL };
rtpg723depay = GST_RTP_G723_DEPAY (depayload);
gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp);
payload_len = gst_rtp_buffer_get_payload_len (&rtp);
/* At least 4 bytes */
if (payload_len < 4)
goto too_small;
GST_LOG_OBJECT (rtpg723depay, "payload len %d", payload_len);
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 */
too_small:
{
GST_ELEMENT_WARNING (rtpg723depay, STREAM, DECODE,
(NULL), ("G723 RTP payload too small (%d)", payload_len));
goto bad_packet;
}
bad_packet:
{
/* no fatal error */
gst_rtp_buffer_unmap (&rtp);
return NULL;
}
}
