/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2001 Thomas <thomas@apestaart.org>
- * 2005 Wim Taymans <wim@fluendo.com>
+ * 2005,2006 Wim Taymans <wim@fluendo.com>
*
* adder.c: Adder element, N in, one out, samples are added
*
* </programlisting>
* This pipeline produces two sine waves mixed together.
* </para>
+ * <para>
+ * The Adder currently mixes all data received on the sinkpads as soon as possible
+ * without trying to synchronize the streams.
+ * </para>
* </refsect2>
+ *
+ * Last reviewed on 2006-05-09 (0.10.7)
*/
/* Element-Checklist-Version: 5 */
static void gst_adder_class_init (GstAdderClass * klass);
static void gst_adder_init (GstAdder * adder);
-static void gst_adder_dispose (GObject * object);
+static void gst_adder_finalize (GObject * object);
static gboolean gst_adder_setcaps (GstPad * pad, GstCaps * caps);
static gboolean gst_adder_query (GstPad * pad, GstQuery * query);
static gboolean gst_adder_src_event (GstPad * pad, GstEvent * event);
+static gboolean gst_adder_sink_event (GstPad * pad, GstEvent * event);
static GstPad *gst_adder_request_new_pad (GstElement * element,
GstPadTemplate * temp, const gchar * unused);
adder = GST_ADDER (GST_PAD_PARENT (pad));
- /* see if the other pads can accept the format */
+ /* FIXME, see if the other pads can accept the format. Also lock the
+ * format on the other pads to this new format. */
GST_OBJECT_LOCK (adder);
pads = GST_ELEMENT (adder)->pads;
while (pads) {
gst_structure_get_int (structure, "channels", &adder->channels);
gst_structure_get_int (structure, "rate", &adder->rate);
+ /* precalc bps */
+ adder->bps = (adder->width / 8) * adder->channels;
return TRUE;
not_supported:
{
+ GST_DEBUG_OBJECT (adder, "unsupported format set as caps");
return FALSE;
}
}
+/* FIXME, the duration query should reflect how long you will produce
+ * data, that is the amount of stream time until you will emit EOS.
+ * For synchronized mixing this
+ * is always the max of all the durations of upstream since we emit
+ * EOS when all of them finished.
+ * We don't do synchronized mixing so this really depends on where the
+ * streams where punched in and what their relative offsets are against
+ * eachother which we can get from the first timestamps we see.
+ * When we add a new stream (or remove a stream) the duration might
+ * also become invalid again and we need to post a new DURATION
+ * message to ntify this fact to the parent.
+ * For now we take the max of all the upstream elements so the simple
+ * cases work at least somewhat. */
+static gboolean
+gst_adder_query_duration (GstAdder * adder, GstQuery * query)
+{
+ GList *pads;
+ gint64 max;
+ gboolean res;
+ GstFormat format;
+
+ max = -1;
+ res = TRUE;
+
+ /* parse format */
+ gst_query_parse_duration (query, &format, NULL);
+
+ GST_OBJECT_LOCK (adder);
+ pads = GST_ELEMENT_CAST (adder)->sinkpads;
+ for (; pads; pads = g_list_next (pads)) {
+ GstPad *pad = GST_PAD_CAST (pads->data);
+ gint64 duration;
+
+ /* ask sink peer for duration */
+ res &= gst_pad_query_peer_duration (pad, &format, &duration);
+ /* take max from all valid return values */
+ if (res) {
+ /* valid unknown length, stop searching */
+ if (duration == -1) {
+ max = duration;
+ break;
+ }
+ /* else see if bigger than current max */
+ else if (duration > max)
+ max = duration;
+ }
+ }
+ GST_OBJECT_UNLOCK (adder);
+
+ /* and store the max */
+ gst_query_set_duration (query, format, max);
+
+ return res;
+}
+
static gboolean
gst_adder_query (GstPad * pad, GstQuery * query)
{
switch (format) {
case GST_FORMAT_TIME:
- gst_query_set_position (query, GST_FORMAT_TIME, adder->timestamp);
+ /* FIXME, bring to stream time, might be tricky */
+ gst_query_set_position (query, format, adder->timestamp);
res = TRUE;
break;
case GST_FORMAT_DEFAULT:
- gst_query_set_position (query, GST_FORMAT_DEFAULT, adder->offset);
+ gst_query_set_position (query, format, adder->offset);
res = TRUE;
break;
default:
}
break;
}
- /* FIXME: what to do about the length? query all pads upstream and
- * pick the longest length? or the shortest length? or what? */
case GST_QUERY_DURATION:
- res = FALSE;
+ res = gst_adder_query_duration (adder, query);
break;
default:
+ /* FIXME, needs a custom query handler because we have multiple
+ * sinkpads */
res = gst_pad_query_default (pad, query);
break;
}
return res;
}
+/* forwards the event to all sinkpads, takes ownership of the
+ * event
+ *
+ * Returns: TRUE if the event could be forwarded on all
+ * sinkpads.
+ */
static gboolean
-gst_adder_src_event (GstPad * pad, GstEvent * event)
+forward_event (GstAdder * adder, GstEvent * event)
{
- GstAdder *adder = GST_ADDER (gst_pad_get_parent (pad));
- GSList *node;
- GstCollectData *data;
- gboolean result = TRUE;
+ gboolean ret;
+ GList *pads;
- GST_LOG_OBJECT (pad, "Sending event %p (%s)", event,
+ GST_LOG_OBJECT (adder, "Forwarding event %p (%s)", event,
GST_EVENT_TYPE_NAME (event));
- for (node = adder->collect->data; (node && result);
- node = g_slist_next (node)) {
- data = (GstCollectData *) node->data;
+ ret = TRUE;
+
+ GST_OBJECT_LOCK (adder);
+ pads = GST_ELEMENT_CAST (adder)->sinkpads;
+ for (; pads; pads = g_list_next (pads)) {
+ GstPad *pad = GST_PAD_CAST (pads->data);
- GST_LOG_OBJECT (pad, " to %s:%s", GST_DEBUG_PAD_NAME (data->pad));
gst_event_ref (event);
- result &= gst_pad_push_event (data->pad, event);
- if (!result) {
- GST_WARNING ("Sending event %p (%s) to %s:%s failed.",
- event, GST_EVENT_TYPE_NAME (event), GST_DEBUG_PAD_NAME (data->pad));
+ ret &= gst_pad_push_event (pad, event);
+
+ if (!ret) {
+ GST_WARNING_OBJECT (pad, "Sending event %p (%s) failed.",
+ event, GST_EVENT_TYPE_NAME (event));
+ break;
+ } else {
+ GST_LOG_OBJECT (pad, "Sent event %p (%s).",
+ event, GST_EVENT_TYPE_NAME (event));
}
}
+ GST_OBJECT_UNLOCK (adder);
+
+ gst_event_unref (event);
+
+ return ret;
+}
+
+static gboolean
+gst_adder_src_event (GstPad * pad, GstEvent * event)
+{
+ GstAdder *adder;
+ gboolean result;
+
+ adder = GST_ADDER (gst_pad_get_parent (pad));
+
+ switch (GST_EVENT_TYPE (event)) {
+ case GST_EVENT_QOS:
+ /* QoS might be tricky */
+ result = FALSE;
+ break;
+ case GST_EVENT_SEEK:
+ /* FIXME seek needs something smarter. */
+ result = forward_event (adder, event);
+ break;
+ case GST_EVENT_NAVIGATION:
+ /* navigation is rather pointless. */
+ result = FALSE;
+ break;
+ default:
+ /* just forward the rest for now */
+ result = forward_event (adder, event);
+ break;
+ }
gst_object_unref (adder);
+
return result;
}
+static gboolean
+gst_adder_sink_event (GstPad * pad, GstEvent * event)
+{
+ GstAdder *adder;
+ gboolean ret;
+
+ adder = GST_ADDER (gst_pad_get_parent (pad));
+
+ GST_DEBUG ("Got %s event on pad %s:%s", GST_EVENT_TYPE_NAME (event),
+ GST_DEBUG_PAD_NAME (pad));
+
+ switch (GST_EVENT_TYPE (event)) {
+ case GST_EVENT_FLUSH_STOP:
+ /* mark a pending new segment. This event is synchronized
+ * with the streaming thread so we can safely update the
+ * variable without races. It's somewhat weird because we
+ * assume the collectpads forwarded the FLUSH_STOP past us
+ * and downstream (using our source pad, the bastard!).
+ */
+ adder->segment_pending = TRUE;
+ break;
+ default:
+ break;
+ }
+
+ /* now GstCollectPads can take care of the rest, e.g. EOS */
+ ret = adder->collect_event (pad, event);
+
+ gst_object_unref (adder);
+ return ret;
+}
+
static void
gst_adder_class_init (GstAdderClass * klass)
{
gobject_class = (GObjectClass *) klass;
- gobject_class->dispose = gst_adder_dispose;
+ gobject_class->finalize = gst_adder_finalize;
gstelement_class = (GstElementClass *) klass;
}
static void
-gst_adder_dispose (GObject * object)
+gst_adder_finalize (GObject * object)
{
GstAdder *adder = GST_ADDER (object);
gst_object_unref (adder->collect);
adder->collect = NULL;
+
+ G_OBJECT_CLASS (parent_class)->finalize (object);
}
static GstPad *
gst_pad_set_setcaps_function (newpad, GST_DEBUG_FUNCPTR (gst_adder_setcaps));
gst_collect_pads_add_pad (adder->collect, newpad, sizeof (GstCollectData));
+ /* FIXME: hacked way to override/extend the event function of
+ * GstCollectPads; because it sets its own event function giving the
+ * element no access to events */
+ adder->collect_event = (GstPadEventFunction) GST_PAD_EVENTFUNC (newpad);
+ gst_pad_set_event_function (newpad, GST_DEBUG_FUNCPTR (gst_adder_sink_event));
+
if (!gst_element_add_pad (GST_ELEMENT (adder), newpad))
goto could_not_add;
adder = GST_ADDER (user_data);
- /* get available bytes for reading */
- size = gst_collect_pads_available (pads);
- if (size == 0)
- return GST_FLOW_OK;
+ /* this is fatal */
+ if (G_UNLIKELY (adder->func == NULL))
+ goto not_negotiated;
outbuf = NULL;
outbytes = NULL;
- if (adder->func == NULL)
- goto not_negotiated;
+ /* get available bytes for reading, this can be 0 which could mean
+ * empty buffers or EOS, which we will catch when we loop over the
+ * pads. */
+ size = gst_collect_pads_available (pads);
GST_LOG_OBJECT (adder,
- "starting to cycle through channels, collecting %d bytes", size);
+ "starting to cycle through channels, %d bytes available", size);
for (collected = pads->data; collected; collected = g_slist_next (collected)) {
GstCollectData *data;
data = (GstCollectData *) collected->data;
- GST_LOG_OBJECT (adder, "looking into channel %p", data);
-
/* get pointer to copy size bytes */
len = gst_collect_pads_read (pads, data, &bytes, size);
- if (len == 0)
- continue;
-
- GST_LOG_OBJECT (adder, " copying %d bytes (format %d,%d)",
- len, adder->format, adder->width);
- GST_LOG_OBJECT (adder, " from channel %p from input data %p", data, bytes);
+ /* length 0 means EOS or an empty buffer so we still need to flush in
+ * case of an empty buffer. */
+ if (len == 0) {
+ GST_LOG_OBJECT (adder, "channel %p: no bytes available", data);
+ goto next;
+ }
if (outbuf == NULL) {
- /* first buffer, alloc size bytes */
+ GST_LOG_OBJECT (adder, "channel %p: making output buffer of %d bytes",
+ data, size);
+
+ /* first buffer, alloc size bytes. FIXME, we can easily subbuffer
+ * and _make_writable. */
outbuf = gst_buffer_new_and_alloc (size);
- gst_buffer_set_caps (outbuf, GST_PAD_CAPS (adder->srcpad));
outbytes = GST_BUFFER_DATA (outbuf);
+ gst_buffer_set_caps (outbuf, GST_PAD_CAPS (adder->srcpad));
+
+ /* clear if we are only going to fill a partial buffer */
+ if (G_UNLIKELY (size > len))
+ memset (outbytes, 0, size);
- memset (outbytes, 0, size);
+ GST_LOG_OBJECT (adder, "channel %p: copying %d bytes from data %p",
+ data, len, bytes);
/* and copy the data into it */
memcpy (outbytes, bytes, len);
} else {
+ GST_LOG_OBJECT (adder, "channel %p: mixing %d bytes from data %p",
+ data, len, bytes);
/* other buffers, need to add them */
adder->func ((gpointer) outbytes, (gpointer) bytes, len);
}
+ next:
gst_collect_pads_flush (pads, data, len);
}
- /* we always timestamp in stream time */
+ /* can only happen when no pads to collect or all EOS */
+ if (outbuf == NULL)
+ goto eos;
+
+ /* our timestamping is very simple, just an ever incrementing
+ * counter, the new segment time will take care of their respective
+ * stream time. */
if (adder->segment_pending) {
GstEvent *event;
+ /* FIXME, use rate/applied_rate as set on all sinkpads.
+ * We could potentially figure out the duration as well using
+ * the current segment positions and the stated stop positions.
+ * Also we just start from stream time 0 which is rather
+ * weird. For non-synchronized mixing, the time should be
+ * the min of the stream times of all received segments,
+ * rationale being that the duration is at least going to
+ * be as long as the earliest stream we start mixing. This
+ * would also be correct for synchronized mixing but then
+ * the later streams would be delayed until the stream times
+ * match.
+ */
event = gst_event_new_new_segment_full (FALSE, 1.0,
- 1.0, GST_FORMAT_TIME, adder->timestamp, -1, adder->timestamp);
+ 1.0, GST_FORMAT_TIME, adder->timestamp, -1, 0);
gst_pad_push_event (adder->srcpad, event);
adder->segment_pending = FALSE;
}
/* set timestamps on the output buffer */
- {
- guint64 samples;
+ GST_BUFFER_TIMESTAMP (outbuf) = adder->timestamp;
+ GST_BUFFER_OFFSET (outbuf) = adder->offset;
- GST_BUFFER_TIMESTAMP (outbuf) = adder->timestamp;
- GST_BUFFER_OFFSET (outbuf) = adder->offset;
+ /* for the next timestamp, use the sample counter, which will
+ * never accumulate rounding errors */
+ adder->offset += size / adder->bps;
+ adder->timestamp = gst_util_uint64_scale_int (adder->offset,
+ GST_SECOND, adder->rate);
- /* get next timestamp */
- /* width is in bits and we need bytes */
- samples = size / ((adder->width / 8) * adder->channels);
-
- adder->offset += samples;
- adder->timestamp = gst_util_uint64_scale_int (adder->offset,
- GST_SECOND, adder->rate);
-
- /* now we can set the duration */
- GST_BUFFER_DURATION (outbuf) = adder->timestamp -
- GST_BUFFER_TIMESTAMP (outbuf);
- }
+ /* now we can set the duration of the buffer */
+ GST_BUFFER_DURATION (outbuf) = adder->timestamp -
+ GST_BUFFER_TIMESTAMP (outbuf);
/* send it out */
- GST_LOG_OBJECT (adder, "pushing outbuf");
+ GST_LOG_OBJECT (adder, "pushing outbuf, timestamp %" GST_TIME_FORMAT,
+ GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (outbuf)));
ret = gst_pad_push (adder->srcpad, outbuf);
- GST_LOG_OBJECT (adder, "pushed outbuf");
return ret;
/* ERRORS */
not_negotiated:
{
+ GST_ELEMENT_ERROR (adder, STREAM, FORMAT, (NULL),
+ ("Unknown data received, not negotiated"));
return GST_FLOW_NOT_NEGOTIATED;
}
+eos:
+ {
+ GST_DEBUG_OBJECT (adder, "no data available, must be EOS");
+ gst_pad_push_event (adder->srcpad, gst_event_new_eos ());
+ return GST_FLOW_UNEXPECTED;
+ }
}
static GstStateChangeReturn
projects / platform / upstream / gst-plugins-base.git / commitdiff