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rtph264depay: simplify buffer accumulation control flow

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There is no difference between pushing out a buffer directly
with gst_rtp_base_depayload_push() and returning it from the
process function. The base class will just call _depayload_push()
on the returned buffer as well.

So instead of marshalling buffers through three layers and back,
just push them from one place in handle_nal() and always return
NULL from the process vfunc. This simplifies the code a little.

Also rename _push_fragmentation_unit() to _finish_fragmentation_unit()
for clarity. Push sounds like it means being pushed out, whereas
it might just be pushed into an adapter.

This change has the side-effect that multiple NALs in a single STAP
(such as SPS/PPS) may no longer be pushed out as a single buffer if
we output NALs in byte-stream format (i.e. not aggregate AUs), but
that shouldn't really make any difference to anyone.
This commit is contained in:
Tim-Philipp Müller 2017-05-26 16:30:06 +01:00
parent 72d2afda18
commit a68a7fb65d
1 changed files with 16 additions and 29 deletions
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45
gst/rtp/gstrtph264depay.c
View file

@ -758,7 +758,7 @@ gst_rtp_h264_complete_au (GstRtpH264Depay * rtph264depay,
* so downstream waiting for keyframe can pick up at SPS/PPS/IDR */
#define NAL_TYPE_IS_KEY(nt) (((nt) == 5) || ((nt) == 7) || ((nt) == 8))
static GstBuffer *
static void
gst_rtp_h264_depay_handle_nal (GstRtpH264Depay * rtph264depay, GstBuffer * nal,
GstClockTime in_timestamp, gboolean marker)
{
@ -788,7 +788,7 @@ gst_rtp_h264_depay_handle_nal (GstRtpH264Depay * rtph264depay, GstBuffer * nal,
4, gst_buffer_get_size (nal) - 4));
gst_buffer_unmap (nal, &map);
gst_buffer_unref (nal);
return NULL;
return;
} else if (rtph264depay->sps->len == 0 || rtph264depay->pps->len == 0) {
/* Down push down any buffer in non-bytestream mode if the SPS/PPS haven't
* go through yet
@ -799,7 +799,7 @@ gst_rtp_h264_depay_handle_nal (GstRtpH264Depay * rtph264depay, GstBuffer * nal,
"all-headers", G_TYPE_BOOLEAN, TRUE, NULL)));
gst_buffer_unmap (nal, &map);
gst_buffer_unref (nal);
return NULL;
return;
}
if (rtph264depay->new_codec_data &&
@ -878,9 +878,11 @@ gst_rtp_h264_depay_handle_nal (GstRtpH264Depay * rtph264depay, GstBuffer * nal,
GST_BUFFER_FLAG_UNSET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
else
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
gst_rtp_base_depayload_push (depayload, outbuf);
}
return outbuf;
return;
/* ERRORS */
short_nal:
@ -888,13 +890,12 @@ short_nal:
GST_WARNING_OBJECT (depayload, "dropping short NAL");
gst_buffer_unmap (nal, &map);
gst_buffer_unref (nal);
return NULL;
return;
}
}
static GstBuffer *
gst_rtp_h264_push_fragmentation_unit (GstRtpH264Depay * rtph264depay,
gboolean send)
static void
gst_rtp_h264_finish_fragmentation_unit (GstRtpH264Depay * rtph264depay)
{
guint outsize;
GstMapInfo map;
@ -919,14 +920,8 @@ gst_rtp_h264_push_fragmentation_unit (GstRtpH264Depay * rtph264depay,
rtph264depay->current_fu_type = 0;
outbuf = gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf,
gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf,
rtph264depay->fu_timestamp, rtph264depay->fu_marker);
if (send && outbuf) {
gst_rtp_base_depayload_push (GST_RTP_BASE_DEPAYLOAD (rtph264depay), outbuf);
outbuf = NULL;
}
return outbuf;
}
static GstBuffer *
@ -988,7 +983,7 @@ gst_rtp_h264_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp)
* when the FU ended) and send out what we gathered thusfar */
if (G_UNLIKELY (rtph264depay->current_fu_type != 0 &&
nal_unit_type != rtph264depay->current_fu_type))
gst_rtp_h264_push_fragmentation_unit (rtph264depay, TRUE);
gst_rtp_h264_finish_fragmentation_unit (rtph264depay);
switch (nal_unit_type) {
case 0:
@ -1045,19 +1040,12 @@ gst_rtp_h264_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp)
gst_rtp_copy_video_meta (rtph264depay, outbuf, rtp->buffer);
outbuf =
gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf, timestamp,
gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf, timestamp,
marker);
if (outbuf)
gst_adapter_push (rtph264depay->adapter, outbuf);
payload += nalu_size;
payload_len -= nalu_size;
}
outsize = gst_adapter_available (rtph264depay->adapter);
if (outsize > 0)
outbuf = gst_adapter_take_buffer (rtph264depay->adapter, outsize);
break;
}
case 26:
@ -1100,7 +1088,7 @@ gst_rtp_h264_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp)
* Assume that the remote payloader is buggy (doesn't set the end
* bit) and send out what we've gathered thusfar */
if (G_UNLIKELY (rtph264depay->current_fu_type != 0))
gst_rtp_h264_push_fragmentation_unit (rtph264depay, TRUE);
gst_rtp_h264_finish_fragmentation_unit (rtph264depay);
rtph264depay->current_fu_type = nal_unit_type;
rtph264depay->fu_timestamp = timestamp;
@ -1152,7 +1140,7 @@ gst_rtp_h264_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp)
/* if NAL unit ends, flush the adapter */
if (E)
outbuf = gst_rtp_h264_push_fragmentation_unit (rtph264depay, FALSE);
gst_rtp_h264_finish_fragmentation_unit (rtph264depay);
break;
}
default:
@ -1178,14 +1166,13 @@ gst_rtp_h264_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp)
gst_rtp_copy_video_meta (rtph264depay, outbuf, rtp->buffer);
outbuf = gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf, timestamp,
marker);
gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf, timestamp, marker);
break;
}
}
}
return outbuf;
return NULL;
/* ERRORS */
empty_packet: