Commit 336a9715 authored by Sebastian Dröge's avatar Sebastian Dröge 🍵

flacparse: Drain the parser when a CAPS event is received

After a CAPS event, in theory a new stream can start and it might start
with the FLAC headers again. We can't detect FLAC headers in the middle
of the stream, so we drain the parser to be able to detect either FLAC
headers after the CAPS event or the continuation of the previous stream.

This fixes for example

gst-launch-1.0 audiotestsrc num-buffers=200 ! flacenc ! c. \
    audiotestsrc num-buffers=200 freq=880 ! flacenc ! c. \
    concat name=c ! rtpgstpay ! udpsink host= port=5000

gst-launch-1.0 udpsrc multicast-group= port=5000 \
    caps=application/x-rtp,media=application,clock-rate=90000,encoding-name=X-GST ! \
    rtpgstdepay ! flacparse ! flacdec ! audioconvert ! pulsesin
parent dff05f45
......@@ -212,6 +212,8 @@ static gboolean gst_flac_parse_src_event (GstBaseParse * parse,
GstEvent * event);
static GstCaps *gst_flac_parse_get_sink_caps (GstBaseParse * parse,
GstCaps * filter);
static gboolean gst_flac_parse_set_sink_caps (GstBaseParse * parse,
GstCaps * caps);
#define gst_flac_parse_parent_class parent_class
G_DEFINE_TYPE (GstFlacParse, gst_flac_parse, GST_TYPE_BASE_PARSE);
......@@ -246,6 +248,8 @@ gst_flac_parse_class_init (GstFlacParseClass * klass)
baseparse_class->src_event = GST_DEBUG_FUNCPTR (gst_flac_parse_src_event);
baseparse_class->get_sink_caps =
GST_DEBUG_FUNCPTR (gst_flac_parse_get_sink_caps);
baseparse_class->set_sink_caps =
GST_DEBUG_FUNCPTR (gst_flac_parse_set_sink_caps);
gst_element_class_add_static_pad_template (element_class, &src_factory);
gst_element_class_add_static_pad_template (element_class, &sink_factory);
......@@ -1875,3 +1879,15 @@ gst_flac_parse_get_sink_caps (GstBaseParse * parse, GstCaps * filter)
return res;
static gboolean
gst_flac_parse_set_sink_caps (GstBaseParse * parse, GstCaps * caps)
/* If caps are changing, drain any pending frames we have so that afterwards
* we can potentially accept a new stream that is starting with the FLAC
* headers again. If headers appear in the middle of the stream we can't
* detect them
gst_base_parse_drain (parse);
return TRUE;
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