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flacparse: Make bitrate estimation more accurate

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This implements the get_frame_overhead() vfunc so that baseparse can
make more accurate bitrate estimates.
This commit is contained in:
Arun Raghavan 2010-03-25 12:55:02 +00:00 committed by Tim-Philipp Müller
parent 44878511b2
commit fb4673cde9
1 changed files with 18 additions and 0 deletions
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18
gst/audioparsers/gstflacparse.c
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@ -86,6 +86,8 @@ static gboolean gst_flac_parse_check_valid_frame (GstBaseParse * parse,
GstBuffer * buffer, guint * framesize, gint * skipsize);
static GstFlowReturn gst_flac_parse_parse_frame (GstBaseParse * parse,
GstBuffer * buffer);
static gint gst_flac_parse_get_frame_overhead (GstBaseParse * parse,
GstBuffer * buffer);
GST_BOILERPLATE (GstFlacParse, gst_flac_parse, GstBaseParse,
GST_TYPE_BASE_PARSE);
@ -122,6 +124,8 @@ gst_flac_parse_class_init (GstFlacParseClass * klass)
baseparse_class->check_valid_frame =
GST_DEBUG_FUNCPTR (gst_flac_parse_check_valid_frame);
baseparse_class->parse_frame = GST_DEBUG_FUNCPTR (gst_flac_parse_parse_frame);
baseparse_class->get_frame_overhead =
GST_DEBUG_FUNCPTR (gst_flac_parse_get_frame_overhead);
}
static void
@ -1288,3 +1292,17 @@ gst_flac_parse_parse_frame (GstBaseParse * parse, GstBuffer * buffer)
return GST_FLOW_OK;
}
}
static gint
gst_flac_parse_get_frame_overhead (GstBaseParse * parse, GstBuffer * buffer)
{
GstFlacParse *flacparse = GST_FLAC_PARSE (parse);
if (flacparse->state != GST_FLAC_PARSE_STATE_DATA)
return -1;
else
/* To simplify, we just assume that it's a fixed size header and ignore
* subframe headers. The first could lead us to being off by 88 bits and
* the second even less, so the total inaccuracy is negligible. */
return 7;
}