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rtpmp4gdepay: detect broken senders who send AAC with ADTS frames

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Strip ADTS headers if we detect any, apparently some Sony cameras
send AAC with ADTS headers. We could also change the stream-format
in the output caps, but that would be unexpected to pipeline builders
and would not exactly be backwards compatible.
This commit is contained in:
Tim-Philipp Müller 2018-09-21 19:47:44 +01:00
parent f255ea99f4
commit 506e080a15
2 changed files with 24 additions and 0 deletions
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22
gst/rtp/gstrtpmp4gdepay.c
View file

@ -233,11 +233,14 @@ gst_rtp_mp4g_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
clock_rate = 90000; /* default */
depayload->clock_rate = clock_rate;
rtpmp4gdepay->check_adts = FALSE;
if ((str = gst_structure_get_string (structure, "media"))) {
if (strcmp (str, "audio") == 0) {
srccaps = gst_caps_new_simple ("audio/mpeg",
"mpegversion", G_TYPE_INT, 4, "stream-format", G_TYPE_STRING, "raw",
NULL);
rtpmp4gdepay->check_adts = TRUE;
} else if (strcmp (str, "video") == 0) {
srccaps = gst_caps_new_simple ("video/mpeg",
"mpegversion", G_TYPE_INT, 4,
@ -664,11 +667,30 @@ gst_rtp_mp4g_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp)
gst_adapter_push (rtpmp4gdepay->adapter, outbuf);
if (M) {
guint32 v = 0;
guint avail;
/* packet is complete, flush */
avail = gst_adapter_available (rtpmp4gdepay->adapter);
/* Some broken senders send ADTS headers (e.g. some Sony cameras).
* Try to detect those and skip them (still needs config set), but
* don't check every frame, only the first (unless we detect ADTS) */
if (rtpmp4gdepay->check_adts && avail >= 7) {
if (gst_adapter_masked_scan_uint32_peek (rtpmp4gdepay->adapter,
0xfffe0000, 0xfff00000, 0, 4, &v) == 0) {
guint adts_hdr_len = (((v >> 16) & 0x1) == 0) ? 9 : 7;
if (avail > adts_hdr_len) {
GST_WARNING_OBJECT (rtpmp4gdepay, "Detected ADTS header of "
"%u bytes, skipping", adts_hdr_len);
gst_adapter_flush (rtpmp4gdepay->adapter, adts_hdr_len);
avail -= adts_hdr_len;
}
} else {
rtpmp4gdepay->check_adts = FALSE;
}
}
outbuf = gst_adapter_take_buffer (rtpmp4gdepay->adapter, avail);
/* copy some of the fields we calculated above on the buffer. We also

2
gst/rtp/gstrtpmp4gdepay.h
View file

@ -67,6 +67,8 @@ struct _GstRtpMP4GDepay
guint32 prev_rtptime;
guint prev_AU_num;
gboolean check_adts; /* check for ADTS headers */
GQueue *packets;
GstAdapter *adapter;