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mp4gdepay: improve constantDuration guessing

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When no constantDuration has been given in the caps, try to derive one from the
timestamp difference between packets. Also keep doing this for each packet
because some broken streams might simply provide wrong timestamps.
This commit is contained in:
Wim Taymans 2010-03-17 16:23:24 +01:00
parent dcb5afd351
commit 7e363149f3
1 changed files with 15 additions and 6 deletions
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21
gst/rtp/gstrtpmp4gdepay.c
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@ -441,6 +441,8 @@ gst_rtp_mp4g_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
payload_len = gst_rtp_buffer_get_payload_len (buf);
payload = gst_rtp_buffer_get_payload (buf);
GST_DEBUG_OBJECT (rtpmp4gdepay, "received payload of %d", payload_len);
rtptime = gst_rtp_buffer_get_timestamp (buf);
M = gst_rtp_buffer_get_marker (buf);
@ -526,8 +528,11 @@ gst_rtp_mp4g_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
if (i == 0) {
AU_index = gst_bs_parse_read (&bs, rtpmp4gdepay->indexlength);
GST_DEBUG_OBJECT (rtpmp4gdepay, "AU index %u", AU_index);
if (AU_index == 0 && rtpmp4gdepay->prev_AU_index == 0) {
gint diff;
gint cd;
/* if we see two consecutive packets with AU_index of 0, we can
* assume we have constantDuration packets. Since we don't have
@ -540,15 +545,17 @@ gst_rtp_mp4g_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
diff = -(rtpmp4gdepay->prev_rtptime - rtptime);
/* if no constantDuration was given, make one */
if (rtpmp4gdepay->constantDuration == 0) {
rtpmp4gdepay->constantDuration = diff / num_AU_headers;
GST_DEBUG_OBJECT (depayload, "guessing constantDuration %d",
rtpmp4gdepay->constantDuration);
if (rtpmp4gdepay->constantDuration != 0) {
cd = rtpmp4gdepay->constantDuration;
GST_DEBUG_OBJECT (depayload, "using constantDuration %d", cd);
} else {
cd = diff / num_AU_headers;
GST_DEBUG_OBJECT (depayload, "guessing constantDuration %d", cd);
}
if (rtpmp4gdepay->constantDuration > 0) {
if (cd > 0) {
/* get the number of packets by dividing with the duration */
diff /= rtpmp4gdepay->constantDuration;
diff /= cd;
} else {
diff = 0;
}
@ -558,6 +565,8 @@ gst_rtp_mp4g_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
AU_index = rtpmp4gdepay->last_AU_index;
GST_DEBUG_OBJECT (rtpmp4gdepay, "diff %d, AU index %u", diff,
AU_index);
} else {
rtpmp4gdepay->prev_AU_index = AU_index;
rtpmp4gdepay->last_AU_index = AU_index;