mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-28 11:10:37 +00:00
wildmidi: use state machine
Use a state machine to keep track of the current state. Add chain function and event function on the sinkpad. Remove some unused code.
This commit is contained in:
Wim Taymans
parent
2127cf3e8c
commit
53f654150b
2 changed files with 156 additions and 131 deletions
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@ -83,7 +83,9 @@ enum
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static void gst_wildmidi_base_init (gpointer g_class);
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static void gst_wildmidi_class_init (GstWildmidiClass * klass);
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static void gst_wildmidi_finalize (GObject * object);
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static gboolean gst_wildmidi_sink_event (GstPad * pad, GstEvent * event);
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static gboolean gst_wildmidi_src_event (GstPad * pad, GstEvent * event);
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static GstStateChangeReturn gst_wildmidi_change_state (GstElement * element,
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@ -92,6 +94,7 @@ static gboolean gst_wildmidi_activate (GstPad * pad);
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static gboolean gst_wildmidi_activatepull (GstPad * pad, gboolean active);
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static void gst_wildmidi_loop (GstPad * sinkpad);
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static GstFlowReturn gst_wildmidi_chain (GstPad * sinkpad, GstBuffer * buffer);
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static gboolean gst_wildmidi_src_query (GstPad * pad, GstQuery * query);
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@ -230,7 +233,7 @@ gst_wildmidi_class_init (GstWildmidiClass * klass)
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gstelement_class->change_state = gst_wildmidi_change_state;
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gobject_class->finalize = gst_wildmidi_finalize;
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gobject_class->set_property = gst_wildmidi_set_property;
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gobject_class->get_property = gst_wildmidi_get_property;
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@ -241,6 +244,8 @@ gst_wildmidi_class_init (GstWildmidiClass * klass)
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g_object_class_install_property (gobject_class, ARG_HIGH_QUALITY,
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g_param_spec_boolean ("high-quality", "High Quality",
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"High Quality", TRUE, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
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gstelement_class->change_state = gst_wildmidi_change_state;
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}
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/* initialize the new element
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@ -260,6 +265,8 @@ gst_wildmidi_init (GstWildmidi * filter, GstWildmidiClass * g_class)
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gst_pad_set_activatepull_function (filter->sinkpad,
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gst_wildmidi_activatepull);
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gst_pad_set_activate_function (filter->sinkpad, gst_wildmidi_activate);
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gst_pad_set_event_function (filter->sinkpad, gst_wildmidi_sink_event);
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gst_pad_set_chain_function (filter->sinkpad, gst_wildmidi_chain);
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gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
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filter->srcpad =
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@ -274,10 +281,18 @@ gst_wildmidi_init (GstWildmidi * filter, GstWildmidiClass * g_class)
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gst_segment_init (filter->o_segment, GST_FORMAT_DEFAULT);
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filter->adapter = gst_adapter_new ();
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filter->bytes_per_frame = WILDMIDI_BPS;
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filter->time_per_frame = GST_SECOND / WILDMIDI_RATE;
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}
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static void
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gst_wildmidi_finalize (GObject * object)
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{
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static gboolean
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gst_wildmidi_src_convert (GstWildmidi * wildmidi,
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GstFormat src_format, gint64 src_value,
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@ -381,20 +396,6 @@ gst_wildmidi_src_query (GstPad * pad, GstQuery * query)
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return res;
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}
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static gboolean
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gst_wildmidi_get_upstream_size (GstWildmidi * wildmidi, gint64 * size)
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{
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GstFormat format = GST_FORMAT_BYTES;
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gboolean res = FALSE;
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GstPad *peer = gst_pad_get_peer (wildmidi->sinkpad);
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if (peer != NULL)
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res = gst_pad_query_duration (peer, &format, size) && *size >= 0;
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gst_object_unref (peer);
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return res;
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}
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static GstSegment *
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gst_wildmidi_get_segment (GstWildmidi * wildmidi, GstFormat format,
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gboolean update)
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@ -521,6 +522,7 @@ gst_wildmidi_src_event (GstPad * pad, GstEvent * event)
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return res;
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}
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static gboolean
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gst_wildmidi_activate (GstPad * sinkpad)
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{
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@ -643,123 +645,58 @@ gst_wildmidi_get_buffer (GstWildmidi * wildmidi)
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return gst_wildmidi_clip_buffer (wildmidi, out);
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}
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static void
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gst_wildmidi_loop (GstPad * sinkpad)
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static gboolean
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gst_wildmidi_parse_song (GstWildmidi * wildmidi)
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{
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GstWildmidi *wildmidi = GST_WILDMIDI (GST_PAD_PARENT (sinkpad));
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GstBuffer *out;
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GstFlowReturn ret;
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struct _WM_Info *info;
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GstCaps *outcaps;
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guint8 *data;
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guint size;
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if (wildmidi->mididata_size == 0) {
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if (!gst_wildmidi_get_upstream_size (wildmidi, &wildmidi->mididata_size)) {
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GST_ELEMENT_ERROR (wildmidi, STREAM, DECODE, (NULL),
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("Unable to get song length"));
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goto paused;
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}
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GST_DEBUG_OBJECT (wildmidi, "Parsing song");
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if (wildmidi->mididata)
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free (wildmidi->mididata);
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size = gst_adapter_available (wildmidi->adapter);
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data = gst_adapter_take (wildmidi->adapter, size);
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wildmidi->mididata = malloc (wildmidi->mididata_size);
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wildmidi->mididata_offset = 0;
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return;
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}
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if (wildmidi->mididata_offset < wildmidi->mididata_size) {
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GstBuffer *buffer;
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gint64 size;
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GST_DEBUG_OBJECT (wildmidi, "loading song");
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ret =
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gst_pad_pull_range (wildmidi->sinkpad, wildmidi->mididata_offset,
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-1, &buffer);
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if (ret != GST_FLOW_OK) {
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GST_ELEMENT_ERROR (wildmidi, STREAM, DECODE, (NULL),
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("Unable to load song"));
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goto paused;
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}
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size = wildmidi->mididata_size - wildmidi->mididata_offset;
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if (GST_BUFFER_SIZE (buffer) < size)
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size = GST_BUFFER_SIZE (buffer);
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memmove (wildmidi->mididata + wildmidi->mididata_offset,
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GST_BUFFER_DATA (buffer), size);
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gst_buffer_unref (buffer);
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wildmidi->mididata_offset += size;
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GST_DEBUG_OBJECT (wildmidi, "Song loaded");
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return;
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}
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/* this method takes our memory block */
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wildmidi->song = WildMidi_OpenBuffer (data, size);
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if (!wildmidi->song) {
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struct _WM_Info *info;
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GST_DEBUG_OBJECT (wildmidi, "Parsing song");
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/* this method takes our memory block */
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wildmidi->song =
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WildMidi_OpenBuffer ((unsigned char *) wildmidi->mididata,
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wildmidi->mididata_size);
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wildmidi->mididata_size = 0;
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wildmidi->mididata = NULL;
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if (!wildmidi->song) {
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GST_ELEMENT_ERROR (wildmidi, STREAM, DECODE, (NULL),
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("Unable to parse midi"));
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goto paused;
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}
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WildMidi_LoadSamples (wildmidi->song);
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WildMidi_SetOption (wildmidi->song, WM_MO_LINEAR_VOLUME,
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wildmidi->linear_volume);
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WildMidi_SetOption (wildmidi->song, WM_MO_EXPENSIVE_INTERPOLATION,
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wildmidi->high_quality);
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info = WildMidi_GetInfo (wildmidi->song);
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wildmidi->o_len = info->approx_total_samples;
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outcaps = gst_caps_copy (gst_pad_get_pad_template_caps (wildmidi->srcpad));
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gst_pad_set_caps (wildmidi->srcpad, outcaps);
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gst_caps_unref (outcaps);
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gst_segment_set_newsegment (wildmidi->o_segment, FALSE, 1.0,
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GST_FORMAT_DEFAULT, 0, GST_CLOCK_TIME_NONE, 0);
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gst_pad_push_event (wildmidi->srcpad,
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gst_wildmidi_get_new_segment_event (wildmidi, GST_FORMAT_TIME, FALSE));
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GST_DEBUG_OBJECT (wildmidi, "Parsing song done");
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return;
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GST_ELEMENT_ERROR (wildmidi, STREAM, DECODE, (NULL),
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("Unable to parse midi"));
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return FALSE;
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}
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if (wildmidi->o_segment_changed) {
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GstSegment *segment;
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WildMidi_LoadSamples (wildmidi->song);
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GST_DEBUG_OBJECT (wildmidi, "segment changed");
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WildMidi_SetOption (wildmidi->song, WM_MO_LINEAR_VOLUME,
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wildmidi->linear_volume);
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WildMidi_SetOption (wildmidi->song, WM_MO_EXPENSIVE_INTERPOLATION,
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wildmidi->high_quality);
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segment = gst_wildmidi_get_segment (wildmidi, GST_FORMAT_TIME,
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!wildmidi->o_new_segment);
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info = WildMidi_GetInfo (wildmidi->song);
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wildmidi->o_len = info->approx_total_samples;
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GST_LOG_OBJECT (wildmidi,
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"sending newsegment from %" GST_TIME_FORMAT "-%" GST_TIME_FORMAT
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", pos=%" GST_TIME_FORMAT, GST_TIME_ARGS ((guint64) segment->start),
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GST_TIME_ARGS ((guint64) segment->stop),
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GST_TIME_ARGS ((guint64) segment->time));
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outcaps = gst_caps_copy (gst_pad_get_pad_template_caps (wildmidi->srcpad));
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gst_pad_set_caps (wildmidi->srcpad, outcaps);
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gst_caps_unref (outcaps);
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if (wildmidi->o_segment->flags & GST_SEEK_FLAG_SEGMENT) {
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gst_element_post_message (GST_ELEMENT (wildmidi),
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gst_message_new_segment_start (GST_OBJECT (wildmidi),
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segment->format, segment->start));
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}
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gst_segment_set_newsegment (wildmidi->o_segment, FALSE, 1.0,
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GST_FORMAT_DEFAULT, 0, GST_CLOCK_TIME_NONE, 0);
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gst_segment_free (segment);
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wildmidi->o_segment_changed = FALSE;
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return;
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}
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gst_pad_push_event (wildmidi->srcpad,
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gst_wildmidi_get_new_segment_event (wildmidi, GST_FORMAT_TIME, FALSE));
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GST_DEBUG_OBJECT (wildmidi, "Parsing song done");
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return TRUE;
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}
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static GstFlowReturn
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gst_wildmidi_do_play (GstWildmidi * wildmidi)
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{
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GstBuffer *out;
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GstFlowReturn ret;
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if (wildmidi->o_seek) {
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unsigned long int sample;
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@ -781,7 +718,7 @@ gst_wildmidi_loop (GstPad * sinkpad)
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GST_LOG_OBJECT (wildmidi, "Song ended, generating eos");
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gst_pad_push_event (wildmidi->srcpad, gst_event_new_eos ());
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wildmidi->o_seek = FALSE;
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goto paused;
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return GST_FLOW_UNEXPECTED;
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}
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if (wildmidi->o_seek) {
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@ -792,9 +729,94 @@ gst_wildmidi_loop (GstPad * sinkpad)
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gst_buffer_set_caps (out, GST_PAD_CAPS (wildmidi->srcpad));
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ret = gst_pad_push (wildmidi->srcpad, out);
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if (GST_FLOW_IS_FATAL (ret) || ret == GST_FLOW_NOT_LINKED)
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goto error;
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return ret;
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}
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static gboolean
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gst_wildmidi_sink_event (GstPad * pad, GstEvent * event)
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{
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gboolean res = FALSE;
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GstWildmidi *wildmidi = GST_WILDMIDI (gst_pad_get_parent (pad));
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GST_DEBUG_OBJECT (pad, "%s event received", GST_EVENT_TYPE_NAME (event));
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_EOS:
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wildmidi->state = GST_WILDMIDI_STATE_PARSE;
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/* now start the parsing task */
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gst_pad_start_task (wildmidi->sinkpad,
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(GstTaskFunction) gst_wildmidi_loop, wildmidi->sinkpad);
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gst_event_unref (event);
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break;
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default:
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res = gst_pad_push_event (wildmidi->srcpad, event);
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break;
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}
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return res;
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}
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static GstFlowReturn
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gst_wildmidi_chain (GstPad * sinkpad, GstBuffer * buffer)
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{
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GstFlowReturn ret;
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GstWildmidi *wildmidi;
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wildmidi = GST_WILDMIDI (GST_PAD_PARENT (sinkpad));
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gst_adapter_push (wildmidi->adapter, buffer);
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ret = GST_FLOW_OK;
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return ret;
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}
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static void
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gst_wildmidi_loop (GstPad * sinkpad)
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{
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GstWildmidi *wildmidi = GST_WILDMIDI (GST_PAD_PARENT (sinkpad));
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GstFlowReturn ret;
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switch (wildmidi->state) {
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case GST_WILDMIDI_STATE_LOAD:
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{
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GstBuffer *buffer;
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GST_DEBUG_OBJECT (wildmidi, "loading song");
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ret =
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gst_pad_pull_range (wildmidi->sinkpad, wildmidi->offset, -1, &buffer);
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if (ret == GST_FLOW_UNEXPECTED) {
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GST_DEBUG_OBJECT (wildmidi, "Song loaded");
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wildmidi->state = GST_WILDMIDI_STATE_PARSE;
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} else if (ret != GST_FLOW_OK) {
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GST_ELEMENT_ERROR (wildmidi, STREAM, DECODE, (NULL),
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("Unable to load song"));
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goto paused;
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} else {
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GST_DEBUG_OBJECT (wildmidi, "pushing buffer");
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gst_adapter_push (wildmidi->adapter, buffer);
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wildmidi->offset += GST_BUFFER_SIZE (buffer);
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}
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break;
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}
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case GST_WILDMIDI_STATE_PARSE:
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{
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if (!wildmidi->song) {
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if (!gst_wildmidi_parse_song (wildmidi))
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goto paused;
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}
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wildmidi->state = GST_WILDMIDI_STATE_PLAY;
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break;
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}
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case GST_WILDMIDI_STATE_PLAY:
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ret = gst_wildmidi_do_play (wildmidi);
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if (GST_FLOW_IS_FATAL (ret) || ret == GST_FLOW_NOT_LINKED)
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goto error;
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break;
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default:
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break;
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}
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return;
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paused:
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@ -821,10 +843,10 @@ gst_wildmidi_change_state (GstElement * element, GstStateChange transition)
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switch (transition) {
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case GST_STATE_CHANGE_NULL_TO_READY:
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wildmidi->mididata = NULL;
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break;
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case GST_STATE_CHANGE_READY_TO_PAUSED:
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wildmidi->mididata_size = 0;
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wildmidi->offset = 0;
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wildmidi->state = GST_WILDMIDI_STATE_LOAD;
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break;
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case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
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break;
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@ -841,9 +863,7 @@ gst_wildmidi_change_state (GstElement * element, GstStateChange transition)
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if (wildmidi->song)
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WildMidi_Close (wildmidi->song);
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wildmidi->song = NULL;
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if (wildmidi->mididata)
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free (wildmidi->mididata);
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wildmidi->mididata = NULL;
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gst_adapter_clear (wildmidi->adapter);
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break;
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case GST_STATE_CHANGE_READY_TO_NULL:
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break;
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@ -47,6 +47,12 @@ G_BEGIN_DECLS
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typedef struct _GstWildmidi GstWildmidi;
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typedef struct _GstWildmidiClass GstWildmidiClass;
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typedef enum {
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GST_WILDMIDI_STATE_LOAD,
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GST_WILDMIDI_STATE_PARSE,
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GST_WILDMIDI_STATE_PLAY
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} GstWildmidiState;
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struct _GstWildmidi
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{
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GstElement element;
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@ -54,14 +60,13 @@ struct _GstWildmidi
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GstPad *sinkpad, *srcpad;
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/* input stream properties */
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gint64 mididata_size, mididata_offset;
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gchar *mididata;
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gboolean mididata_filled;
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GstWildmidiState state;
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GstAdapter *adapter;
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midi *song;
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guint64 offset;
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/* output data */
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gboolean o_new_segment, o_segment_changed, o_seek;
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gboolean o_new_segment, o_seek;
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GstSegment o_segment[1];
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gint64 o_len;
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