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ac3parse: Support switching alignment on-the-fly

Browse source 
This allows switching of alignment for E-AC3 streams at run-time. This
is requested by downstream elements via a custom event.

https://bugzilla.gnome.org/show_bug.cgi?id=650313
This commit is contained in:
Arun Raghavan 2011-04-12 17:01:47 +05:30
parent 96972eb462
commit 89564fcb69
2 changed files with 55 additions and 15 deletions
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60
gst/audioparsers/gstac3parse.c
View file

@ -163,6 +163,8 @@ static gboolean gst_ac3_parse_check_valid_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, guint * size, gint * skipsize);
static GstFlowReturn gst_ac3_parse_parse_frame (GstBaseParse * parse,
GstBaseParseFrame * frame);
static gboolean gst_ac3_parse_src_event (GstBaseParse * parse,
GstEvent * event);
GST_BOILERPLATE (GstAc3Parse, gst_ac3_parse, GstBaseParse, GST_TYPE_BASE_PARSE);
@ -197,6 +199,8 @@ gst_ac3_parse_class_init (GstAc3ParseClass * klass)
parse_class->check_valid_frame =
GST_DEBUG_FUNCPTR (gst_ac3_parse_check_valid_frame);
parse_class->parse_frame = GST_DEBUG_FUNCPTR (gst_ac3_parse_parse_frame);
parse_class->src_event = GST_DEBUG_FUNCPTR (gst_ac3_parse_src_event);
}
static void
@ -206,7 +210,7 @@ gst_ac3_parse_reset (GstAc3Parse * ac3parse)
ac3parse->sample_rate = -1;
ac3parse->blocks = -1;
ac3parse->eac = FALSE;
ac3parse->align = GST_AC3_PARSE_ALIGN_NONE;
g_atomic_int_set (&ac3parse->align, GST_AC3_PARSE_ALIGN_NONE);
}
static void
@ -265,11 +269,16 @@ gst_ac3_parse_set_alignment (GstAc3Parse * ac3parse, gboolean eac)
continue;
if ((str = gst_structure_get_string (st, "alignment"))) {
if (strcmp (str, "iec61937") == 0) {
ac3parse->align = GST_AC3_PARSE_ALIGN_IEC61937;
if (g_str_equal (str, "iec61937")) {
g_atomic_int_set (&ac3parse->align, GST_AC3_PARSE_ALIGN_IEC61937);
GST_DEBUG_OBJECT (ac3parse, "picked iec61937 alignment");
} else
GST_INFO_OBJECT (ac3parse, "unknown alignment: %s", str);
} else if (g_str_equal (str, "frame") == 0) {
g_atomic_int_set (&ac3parse->align, GST_AC3_PARSE_ALIGN_FRAME);
GST_DEBUG_OBJECT (ac3parse, "picked frame alignment");
} else {
g_atomic_int_set (&ac3parse->align, GST_AC3_PARSE_ALIGN_FRAME);
GST_WARNING_OBJECT (ac3parse, "unknown alignment: %s", str);
}
break;
}
}
@ -280,7 +289,7 @@ gst_ac3_parse_set_alignment (GstAc3Parse * ac3parse, gboolean eac)
done:
/* default */
if (ac3parse->align == GST_AC3_PARSE_ALIGN_NONE) {
ac3parse->align = GST_AC3_PARSE_ALIGN_FRAME;
g_atomic_int_set (&ac3parse->align, GST_AC3_PARSE_ALIGN_FRAME);
GST_DEBUG_OBJECT (ac3parse, "picked syncframe alignment");
}
}
@ -477,7 +486,8 @@ gst_ac3_parse_check_valid_frame (GstBaseParse * parse,
*framesize = frmsiz;
if (G_UNLIKELY (ac3parse->align == GST_AC3_PARSE_ALIGN_NONE))
if (G_UNLIKELY (g_atomic_int_get (&ac3parse->align) ==
GST_AC3_PARSE_ALIGN_NONE))
gst_ac3_parse_set_alignment (ac3parse, eac);
GST_LOG_OBJECT (parse, "got frame");
@ -485,7 +495,7 @@ gst_ac3_parse_check_valid_frame (GstBaseParse * parse,
lost_sync = GST_BASE_PARSE_LOST_SYNC (parse);
draining = GST_BASE_PARSE_DRAINING (parse);
if (ac3parse->align == GST_AC3_PARSE_ALIGN_IEC61937) {
if (g_atomic_int_get (&ac3parse->align) == GST_AC3_PARSE_ALIGN_IEC61937) {
/* We need 6 audio blocks from each substream, so we keep going forwards
* till we have it */
@ -586,8 +596,8 @@ gst_ac3_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
"framed", G_TYPE_BOOLEAN, TRUE, "rate", G_TYPE_INT, rate,
"channels", G_TYPE_INT, chans, NULL);
gst_caps_set_simple (caps, "alignment", G_TYPE_STRING,
ac3parse->align == GST_AC3_PARSE_ALIGN_IEC61937 ? "iec61937" : "frame",
NULL);
g_atomic_int_get (&ac3parse->align) == GST_AC3_PARSE_ALIGN_IEC61937 ?
"iec61937" : "frame", NULL);
gst_buffer_set_caps (buf, caps);
gst_pad_set_caps (GST_BASE_PARSE_SRC_PAD (parse), caps);
gst_caps_unref (caps);
@ -618,3 +628,33 @@ broken_header:
return GST_FLOW_ERROR;
}
}
static gboolean
gst_ac3_parse_src_event (GstBaseParse * parse, GstEvent * event)
{
GstAc3Parse *ac3parse = GST_AC3_PARSE (parse);
if (G_UNLIKELY (GST_EVENT_TYPE (event) == GST_EVENT_CUSTOM_UPSTREAM) &&
gst_event_has_name (event, "ac3parse-set-alignment")) {
const GstStructure *st = gst_event_get_structure (event);
const gchar *align = gst_structure_get_string (st, "alignment");
if (g_str_equal (align, "iec61937")) {
GST_DEBUG_OBJECT (ac3parse, "Switching to iec61937 alignment");
g_atomic_int_set (&ac3parse->align, GST_AC3_PARSE_ALIGN_IEC61937);
} else if (g_str_equal (align, "frame")) {
GST_DEBUG_OBJECT (ac3parse, "Switching to frame alignment");
g_atomic_int_set (&ac3parse->align, GST_AC3_PARSE_ALIGN_FRAME);
} else {
g_atomic_int_set (&ac3parse->align, GST_AC3_PARSE_ALIGN_FRAME);
GST_WARNING_OBJECT (ac3parse, "Got unknown alignment request (%s) "
"reverting to frame alignment.",
gst_structure_get_string (st, "alignment"));
}
gst_event_unref (event);
return TRUE;
}
return GST_BASE_PARSE_CLASS (parent_class)->src_event (parse, event);
}

2
gst/audioparsers/gstac3parse.h
View file

@ -61,7 +61,7 @@ struct _GstAc3Parse {
gint channels;
gint blocks;
gboolean eac;
gint align;
volatile gint align;
};
/**