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h264parse: Don't switch to passthrough on set_caps()

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Wait until at least one keyframe has been parsed before
deciding to switch to passthrough mode, in case the
stream contains SEI messages that supplement the output
caps - for example by providing stereoscopic information
This commit is contained in:
Jan Schmidt 2015-06-11 01:57:08 +10:00
parent 5697b6b89b
commit e8908f5aee
2 changed files with 21 additions and 9 deletions
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28
gst/videoparsers/gsth264parse.c
View File

@ -352,8 +352,8 @@ gst_h264_parse_negotiate (GstH264Parse * h264parse, gint in_format,
GstCaps * in_caps) GstCaps * in_caps)
{ {
GstCaps *caps; GstCaps *caps;
guint format = GST_H264_PARSE_FORMAT_NONE; guint format = h264parse->format;
guint align = GST_H264_PARSE_ALIGN_NONE; guint align = h264parse->align;
g_return_if_fail ((in_caps == NULL) || gst_caps_is_fixed (in_caps)); g_return_if_fail ((in_caps == NULL) || gst_caps_is_fixed (in_caps));
@ -368,12 +368,15 @@ gst_h264_parse_negotiate (GstH264Parse * h264parse, gint in_format,
caps); caps);
} }
h264parse->can_passthrough = FALSE;
if (in_caps && caps) { if (in_caps && caps) {
if (gst_caps_can_intersect (in_caps, caps)) { if (gst_caps_can_intersect (in_caps, caps)) {
GST_DEBUG_OBJECT (h264parse, "downstream accepts upstream caps"); GST_DEBUG_OBJECT (h264parse, "downstream accepts upstream caps");
gst_h264_parse_format_from_caps (in_caps, &format, &align); gst_h264_parse_format_from_caps (in_caps, &format, &align);
gst_caps_unref (caps); gst_caps_unref (caps);
caps = NULL; caps = NULL;
h264parse->can_passthrough = TRUE;
} }
} }
@ -2187,6 +2190,18 @@ gst_h264_parse_pre_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
} }
} }
/* If SPS/PPS and a keyframe have been parsed, and we're not converting,
* we might switch to passthrough mode now on the basis that we've seen
* the SEI packets and know optional caps params (such as multiview).
* This is an efficiency optimisation that relies on stream properties
* remaining uniform in practice. */
if (h264parse->can_passthrough) {
if (h264parse->keyframe && h264parse->have_sps && h264parse->have_pps) {
GST_LOG_OBJECT (parse, "Switching to passthrough mode");
gst_base_parse_set_passthrough (parse, TRUE);
}
}
gst_h264_parse_reset_frame (h264parse); gst_h264_parse_reset_frame (h264parse);
return GST_FLOW_OK; return GST_FLOW_OK;
@ -2373,13 +2388,8 @@ gst_h264_parse_set_caps (GstBaseParse * parse, GstCaps * caps)
} }
if (format == h264parse->format && align == h264parse->align) { if (format == h264parse->format && align == h264parse->align) {
/* do not set CAPS and passthrough mode if SPS/PPS have not been parsed */ /* we did parse codec-data and might supplement src caps */
if (h264parse->have_sps && h264parse->have_pps) { gst_h264_parse_update_src_caps (h264parse, caps);
gst_base_parse_set_passthrough (parse, TRUE);
/* we did parse codec-data and might supplement src caps */
gst_h264_parse_update_src_caps (h264parse, caps);
}
} else if (format == GST_H264_PARSE_FORMAT_AVC } else if (format == GST_H264_PARSE_FORMAT_AVC
|| format == GST_H264_PARSE_FORMAT_AVC3) { || format == GST_H264_PARSE_FORMAT_AVC3) {
/* if input != output, and input is avc, must split before anything else */ /* if input != output, and input is avc, must split before anything else */

2
gst/videoparsers/gsth264parse.h
View File

@ -73,6 +73,8 @@ struct _GstH264Parse
guint align; guint align;
guint format; guint format;
gint current_off; gint current_off;
/* True if input format and alignment match negotiated output */
gboolean can_passthrough;
GstClockTime last_report; GstClockTime last_report;
gboolean push_codec; gboolean push_codec;