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h264parse: introduce new state tracking variables.

Browse source 
Improve parser state tracking by introducing new flags reflecting
it: "got-sps", "got-pps" and "got-slice". This is an addition for
robustness purposes.

Older have_sps and have_pps variables are kept because they have
a different meaning. i.e. they are used for deciding on when to
submit updated caps or not, and rather mean "have new SPS/PPS to
be submitted?"

Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
This commit is contained in:
Gwenole Beauchesne 2014-06-25 11:06:41 +02:00
parent 5601c87598
commit 7bb6443bfb
2 changed files with 32 additions and 1 deletions
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30
gst/videoparsers/gsth264parse.c
View file

@ -60,6 +60,22 @@ enum
GST_H264_PARSE_ALIGN_AU
};
enum
{
GST_H264_PARSE_STATE_GOT_SPS = 1 << 0,
GST_H264_PARSE_STATE_GOT_PPS = 1 << 1,
GST_H264_PARSE_STATE_GOT_SLICE = 1 << 2,
GST_H264_PARSE_STATE_VALID_PICTURE_HEADERS = (GST_H264_PARSE_STATE_GOT_SPS |
GST_H264_PARSE_STATE_GOT_PPS),
GST_H264_PARSE_STATE_VALID_PICTURE =
(GST_H264_PARSE_STATE_VALID_PICTURE_HEADERS |
GST_H264_PARSE_STATE_GOT_SLICE)
};
#define GST_H264_PARSE_STATE_VALID(parse, expected_state) \
(((parse)->state & (expected_state)) == (expected_state))
static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
@ -540,6 +556,9 @@ gst_h264_parse_process_nal (GstH264Parse * h264parse, GstH264NalUnit * nalu)
switch (nal_type) {
case GST_H264_NAL_SPS:
/* reset state, everything else is obsolete */
h264parse->state = 0;
pres = gst_h264_parser_parse_sps (nalparser, nalu, &sps, TRUE);
/* arranged for a fallback sps.id, so use that one and only warn */
if (pres != GST_H264_PARSER_OK)
@ -558,8 +577,11 @@ gst_h264_parse_process_nal (GstH264Parse * h264parse, GstH264NalUnit * nalu)
}
gst_h264_parser_store_nal (h264parse, sps.id, nal_type, nalu);
h264parse->state |= GST_H264_PARSE_STATE_GOT_SPS;
break;
case GST_H264_NAL_PPS:
h264parse->state &= GST_H264_PARSE_STATE_GOT_SPS;
pres = gst_h264_parser_parse_pps (nalparser, nalu, &pps);
/* arranged for a fallback pps.id, so use that one and only warn */
if (pres != GST_H264_PARSER_OK)
@ -582,6 +604,7 @@ gst_h264_parse_process_nal (GstH264Parse * h264parse, GstH264NalUnit * nalu)
gst_h264_parser_store_nal (h264parse, pps.id, nal_type, nalu);
gst_h264_pps_clear (&pps);
h264parse->state |= GST_H264_PARSE_STATE_GOT_PPS;
break;
case GST_H264_NAL_SEI:
gst_h264_parse_process_sei (h264parse, nalu);
@ -601,6 +624,8 @@ gst_h264_parse_process_nal (GstH264Parse * h264parse, GstH264NalUnit * nalu)
case GST_H264_NAL_SLICE_DPB:
case GST_H264_NAL_SLICE_DPC:
case GST_H264_NAL_SLICE_IDR:
h264parse->state &= GST_H264_PARSE_STATE_VALID_PICTURE_HEADERS;
/* don't need to parse the whole slice (header) here */
if (*(nalu->data + nalu->offset + 1) & 0x80) {
/* means first_mb_in_slice == 0 */
@ -621,6 +646,7 @@ gst_h264_parse_process_nal (GstH264Parse * h264parse, GstH264NalUnit * nalu)
if (GST_H264_IS_I_SLICE (&slice) || GST_H264_IS_SI_SLICE (&slice))
h264parse->keyframe |= TRUE;
h264parse->state |= GST_H264_PARSE_STATE_GOT_SLICE;
h264parse->field_pic_flag = slice.field_pic_flag;
}
}
@ -970,7 +996,8 @@ gst_h264_parse_handle_frame (GstBaseParse * parse,
if (nalu.type == GST_H264_NAL_SPS ||
nalu.type == GST_H264_NAL_PPS ||
(h264parse->have_sps && h264parse->have_pps)) {
GST_H264_PARSE_STATE_VALID (h264parse,
GST_H264_PARSE_STATE_VALID_PICTURE_HEADERS)) {
gst_h264_parse_process_nal (h264parse, &nalu);
} else {
GST_WARNING_OBJECT (h264parse,
@ -1767,6 +1794,7 @@ gst_h264_parse_pre_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
h264parse->push_codec = FALSE;
h264parse->have_sps = FALSE;
h264parse->have_pps = FALSE;
h264parse->state &= GST_H264_PARSE_STATE_VALID_PICTURE_HEADERS;
}
}

3
gst/videoparsers/gsth264parse.h
View file

@ -69,12 +69,15 @@ struct _GstH264Parse
/* state */
GstH264NalParser *nalparser;
guint state;
guint align;
guint format;
gint current_off;
GstClockTime last_report;
gboolean push_codec;
/* The following variables have a meaning in context of "have
* SPS/PPS to push downstream", e.g. to update caps */
gboolean have_sps;
gboolean have_pps;