| /* GStreamer |
| * Copyright (C) 2006 Thomas Vander Stichele <thomas at apestaart dot org> |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public |
| * License along with this library; if not, write to the |
| * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| /** |
| * SECTION:element-gdpdepay |
| * @see_also: gdppay |
| * |
| * This element depayloads GStreamer Data Protocol buffers back to deserialized |
| * buffers and events. |
| * |
| * <refsect2> |
| * |[ |
| * gst-launch-1.0 -v -m filesrc location=test.gdp ! gdpdepay ! xvimagesink |
| * ]| This pipeline plays back a serialized video stream as created in the |
| * example for gdppay. |
| * </refsect2> |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <string.h> |
| |
| #include "dataprotocol.h" |
| |
| #include "gstgdpdepay.h" |
| |
| enum |
| { |
| PROP_0, |
| }; |
| |
| static GstStaticPadTemplate gdp_depay_sink_template = |
| GST_STATIC_PAD_TEMPLATE ("sink", |
| GST_PAD_SINK, |
| GST_PAD_ALWAYS, |
| GST_STATIC_CAPS ("application/x-gdp")); |
| |
| static GstStaticPadTemplate gdp_depay_src_template = |
| GST_STATIC_PAD_TEMPLATE ("src", |
| GST_PAD_SRC, |
| GST_PAD_ALWAYS, |
| GST_STATIC_CAPS_ANY); |
| |
| GST_DEBUG_CATEGORY_STATIC (gst_gdp_depay_debug); |
| #define GST_CAT_DEFAULT gst_gdp_depay_debug |
| |
| #define _do_init \ |
| GST_DEBUG_CATEGORY_INIT (gst_gdp_depay_debug, "gdpdepay", 0, \ |
| "GDP depayloader"); |
| #define gst_gdp_depay_parent_class parent_class |
| G_DEFINE_TYPE_WITH_CODE (GstGDPDepay, gst_gdp_depay, |
| GST_TYPE_ELEMENT, _do_init); |
| |
| static gboolean gst_gdp_depay_sink_event (GstPad * pad, GstObject * parent, |
| GstEvent * event); |
| static gboolean gst_gdp_depay_src_event (GstPad * pad, GstObject * parent, |
| GstEvent * event); |
| |
| static GstFlowReturn gst_gdp_depay_chain (GstPad * pad, GstObject * parent, |
| GstBuffer * buffer); |
| |
| static GstStateChangeReturn gst_gdp_depay_change_state (GstElement * |
| element, GstStateChange transition); |
| |
| static void gst_gdp_depay_finalize (GObject * object); |
| |
| static void |
| gst_gdp_depay_class_init (GstGDPDepayClass * klass) |
| { |
| GObjectClass *gobject_class; |
| GstElementClass *gstelement_class; |
| |
| gobject_class = (GObjectClass *) klass; |
| gstelement_class = (GstElementClass *) klass; |
| |
| gst_element_class_set_static_metadata (gstelement_class, |
| "GDP Depayloader", "GDP/Depayloader", |
| "Depayloads GStreamer Data Protocol buffers", |
| "Thomas Vander Stichele <thomas at apestaart dot org>"); |
| |
| gst_element_class_add_pad_template (gstelement_class, |
| gst_static_pad_template_get (&gdp_depay_sink_template)); |
| gst_element_class_add_pad_template (gstelement_class, |
| gst_static_pad_template_get (&gdp_depay_src_template)); |
| |
| gstelement_class->change_state = |
| GST_DEBUG_FUNCPTR (gst_gdp_depay_change_state); |
| gobject_class->finalize = gst_gdp_depay_finalize; |
| } |
| |
| static void |
| gst_gdp_depay_init (GstGDPDepay * gdpdepay) |
| { |
| gdpdepay->sinkpad = |
| gst_pad_new_from_static_template (&gdp_depay_sink_template, "sink"); |
| gst_pad_set_chain_function (gdpdepay->sinkpad, |
| GST_DEBUG_FUNCPTR (gst_gdp_depay_chain)); |
| gst_pad_set_event_function (gdpdepay->sinkpad, |
| GST_DEBUG_FUNCPTR (gst_gdp_depay_sink_event)); |
| gst_element_add_pad (GST_ELEMENT (gdpdepay), gdpdepay->sinkpad); |
| |
| gdpdepay->srcpad = |
| gst_pad_new_from_static_template (&gdp_depay_src_template, "src"); |
| gst_pad_set_event_function (gdpdepay->srcpad, |
| GST_DEBUG_FUNCPTR (gst_gdp_depay_src_event)); |
| /* our caps will always be decided by the incoming GDP caps buffers */ |
| gst_pad_use_fixed_caps (gdpdepay->srcpad); |
| gst_element_add_pad (GST_ELEMENT (gdpdepay), gdpdepay->srcpad); |
| |
| gdpdepay->adapter = gst_adapter_new (); |
| } |
| |
| static void |
| gst_gdp_depay_finalize (GObject * gobject) |
| { |
| GstGDPDepay *this; |
| |
| this = GST_GDP_DEPAY (gobject); |
| if (this->caps) |
| gst_caps_unref (this->caps); |
| g_free (this->header); |
| gst_adapter_clear (this->adapter); |
| g_object_unref (this->adapter); |
| |
| GST_CALL_PARENT (G_OBJECT_CLASS, finalize, (gobject)); |
| } |
| |
| static gboolean |
| gst_gdp_depay_sink_event (GstPad * pad, GstObject * parent, GstEvent * event) |
| { |
| GstGDPDepay *this; |
| gboolean res = TRUE; |
| |
| this = GST_GDP_DEPAY (parent); |
| |
| switch (GST_EVENT_TYPE (event)) { |
| case GST_EVENT_FLUSH_START: |
| /* forward flush start */ |
| res = gst_pad_push_event (this->srcpad, event); |
| break; |
| case GST_EVENT_FLUSH_STOP: |
| /* clear adapter on flush */ |
| gst_adapter_clear (this->adapter); |
| /* forward flush stop */ |
| res = gst_pad_push_event (this->srcpad, event); |
| break; |
| case GST_EVENT_EOS: |
| /* after EOS, we don't expect to output anything anymore */ |
| res = gst_pad_push_event (this->srcpad, event); |
| break; |
| case GST_EVENT_SEGMENT: |
| case GST_EVENT_TAG: |
| case GST_EVENT_BUFFERSIZE: |
| default: |
| /* we unref most events as we take them from the datastream */ |
| gst_event_unref (event); |
| break; |
| } |
| |
| return res; |
| } |
| |
| static gboolean |
| gst_gdp_depay_src_event (GstPad * pad, GstObject * parent, GstEvent * event) |
| { |
| GstGDPDepay *this; |
| gboolean res = TRUE; |
| |
| this = GST_GDP_DEPAY (parent); |
| |
| switch (GST_EVENT_TYPE (event)) { |
| case GST_EVENT_SEEK: |
| /* we refuse seek for now. */ |
| gst_event_unref (event); |
| res = FALSE; |
| break; |
| case GST_EVENT_QOS: |
| case GST_EVENT_NAVIGATION: |
| default: |
| /* everything else is passed */ |
| res = gst_pad_push_event (this->sinkpad, event); |
| break; |
| } |
| |
| return res; |
| } |
| |
| static GstFlowReturn |
| gst_gdp_depay_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer) |
| { |
| GstGDPDepay *this; |
| GstFlowReturn ret = GST_FLOW_OK; |
| GstCaps *caps; |
| GstBuffer *buf; |
| GstEvent *event; |
| guint available; |
| |
| this = GST_GDP_DEPAY (parent); |
| |
| /* On DISCONT, get rid of accumulated data. We assume a buffer after the |
| * DISCONT contains (part of) a new valid header, if not we error because we |
| * lost sync */ |
| if (GST_BUFFER_IS_DISCONT (buffer)) { |
| gst_adapter_clear (this->adapter); |
| this->state = GST_GDP_DEPAY_STATE_HEADER; |
| } |
| gst_adapter_push (this->adapter, buffer); |
| |
| while (TRUE) { |
| switch (this->state) { |
| case GST_GDP_DEPAY_STATE_HEADER: |
| { |
| guint8 *header; |
| |
| /* collect a complete header, validate and store the header. Figure out |
| * the payload length and switch to the PAYLOAD state */ |
| available = gst_adapter_available (this->adapter); |
| if (available < GST_DP_HEADER_LENGTH) |
| goto done; |
| |
| GST_LOG_OBJECT (this, "reading GDP header from adapter"); |
| header = gst_adapter_take (this->adapter, GST_DP_HEADER_LENGTH); |
| if (!gst_dp_validate_header (GST_DP_HEADER_LENGTH, header)) { |
| g_free (header); |
| goto header_validate_error; |
| } |
| |
| /* store types and payload length. Also store the header, which we need |
| * to make the payload. */ |
| this->payload_length = gst_dp_header_payload_length (header); |
| this->payload_type = gst_dp_header_payload_type (header); |
| /* free previous header and store new one. */ |
| g_free (this->header); |
| this->header = header; |
| |
| GST_LOG_OBJECT (this, |
| "read GDP header, payload size %d, payload type %d, switching to state PAYLOAD", |
| this->payload_length, this->payload_type); |
| this->state = GST_GDP_DEPAY_STATE_PAYLOAD; |
| break; |
| } |
| case GST_GDP_DEPAY_STATE_PAYLOAD: |
| { |
| /* in this state we wait for all the payload data to be available in the |
| * adapter. Then we switch to the state where we actually process the |
| * payload. */ |
| available = gst_adapter_available (this->adapter); |
| if (available < this->payload_length) |
| goto done; |
| |
| /* change state based on type */ |
| if (this->payload_type == GST_DP_PAYLOAD_BUFFER) { |
| GST_LOG_OBJECT (this, "switching to state BUFFER"); |
| this->state = GST_GDP_DEPAY_STATE_BUFFER; |
| } else if (this->payload_type == GST_DP_PAYLOAD_CAPS) { |
| GST_LOG_OBJECT (this, "switching to state CAPS"); |
| this->state = GST_GDP_DEPAY_STATE_CAPS; |
| } else if (this->payload_type >= GST_DP_PAYLOAD_EVENT_NONE) { |
| GST_LOG_OBJECT (this, "switching to state EVENT"); |
| this->state = GST_GDP_DEPAY_STATE_EVENT; |
| } else { |
| goto wrong_type; |
| } |
| |
| if (this->payload_length) { |
| const guint8 *data; |
| gboolean res; |
| |
| data = gst_adapter_map (this->adapter, this->payload_length); |
| res = gst_dp_validate_payload (GST_DP_HEADER_LENGTH, this->header, |
| data); |
| gst_adapter_unmap (this->adapter); |
| |
| if (!res) |
| goto payload_validate_error; |
| } |
| |
| break; |
| } |
| case GST_GDP_DEPAY_STATE_BUFFER: |
| { |
| /* if we receive a buffer without caps first, we error out */ |
| if (!this->caps) |
| goto no_caps; |
| |
| GST_LOG_OBJECT (this, "reading GDP buffer from adapter"); |
| buf = gst_dp_buffer_from_header (GST_DP_HEADER_LENGTH, this->header); |
| if (!buf) |
| goto buffer_failed; |
| |
| /* now take the payload if there is any */ |
| if (this->payload_length > 0) { |
| GstMapInfo map; |
| |
| gst_buffer_map (buf, &map, GST_MAP_WRITE); |
| gst_adapter_copy (this->adapter, map.data, 0, this->payload_length); |
| gst_buffer_unmap (buf, &map); |
| |
| gst_adapter_flush (this->adapter, this->payload_length); |
| } |
| |
| /* set caps and push */ |
| GST_LOG_OBJECT (this, "deserialized buffer %p, pushing, timestamp %" |
| GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT |
| ", offset %" G_GINT64_FORMAT ", offset_end %" G_GINT64_FORMAT |
| ", size %" G_GSIZE_FORMAT ", flags 0x%x", |
| buf, |
| GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)), |
| GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), |
| GST_BUFFER_OFFSET (buf), GST_BUFFER_OFFSET_END (buf), |
| gst_buffer_get_size (buf), GST_BUFFER_FLAGS (buf)); |
| ret = gst_pad_push (this->srcpad, buf); |
| if (ret != GST_FLOW_OK) |
| goto push_error; |
| |
| GST_LOG_OBJECT (this, "switching to state HEADER"); |
| this->state = GST_GDP_DEPAY_STATE_HEADER; |
| break; |
| } |
| case GST_GDP_DEPAY_STATE_CAPS: |
| { |
| guint8 *payload; |
| |
| /* take the payload of the caps */ |
| GST_LOG_OBJECT (this, "reading GDP caps from adapter"); |
| payload = gst_adapter_take (this->adapter, this->payload_length); |
| caps = gst_dp_caps_from_packet (GST_DP_HEADER_LENGTH, this->header, |
| payload); |
| g_free (payload); |
| if (!caps) |
| goto caps_failed; |
| |
| GST_DEBUG_OBJECT (this, "deserialized caps %" GST_PTR_FORMAT, caps); |
| gst_caps_replace (&(this->caps), caps); |
| gst_pad_set_caps (this->srcpad, caps); |
| /* drop the creation ref we still have */ |
| gst_caps_unref (caps); |
| |
| GST_LOG_OBJECT (this, "switching to state HEADER"); |
| this->state = GST_GDP_DEPAY_STATE_HEADER; |
| break; |
| } |
| case GST_GDP_DEPAY_STATE_EVENT: |
| { |
| guint8 *payload; |
| |
| GST_LOG_OBJECT (this, "reading GDP event from adapter"); |
| |
| /* adapter doesn't like 0 length payload */ |
| if (this->payload_length > 0) |
| payload = gst_adapter_take (this->adapter, this->payload_length); |
| else |
| payload = NULL; |
| event = gst_dp_event_from_packet (GST_DP_HEADER_LENGTH, this->header, |
| payload); |
| g_free (payload); |
| if (!event) |
| goto event_failed; |
| |
| GST_DEBUG_OBJECT (this, "deserialized event %p of type %s, pushing", |
| event, gst_event_type_get_name (event->type)); |
| gst_pad_push_event (this->srcpad, event); |
| |
| GST_LOG_OBJECT (this, "switching to state HEADER"); |
| this->state = GST_GDP_DEPAY_STATE_HEADER; |
| break; |
| } |
| } |
| } |
| |
| done: |
| return ret; |
| |
| /* ERRORS */ |
| header_validate_error: |
| { |
| GST_ELEMENT_ERROR (this, STREAM, DECODE, (NULL), |
| ("GDP packet header does not validate")); |
| ret = GST_FLOW_ERROR; |
| goto done; |
| } |
| payload_validate_error: |
| { |
| GST_ELEMENT_ERROR (this, STREAM, DECODE, (NULL), |
| ("GDP packet payload does not validate")); |
| ret = GST_FLOW_ERROR; |
| goto done; |
| } |
| wrong_type: |
| { |
| GST_ELEMENT_ERROR (this, STREAM, DECODE, (NULL), |
| ("GDP packet header is of wrong type")); |
| ret = GST_FLOW_ERROR; |
| goto done; |
| } |
| no_caps: |
| { |
| GST_ELEMENT_ERROR (this, STREAM, DECODE, (NULL), |
| ("Received a buffer without first receiving caps")); |
| ret = GST_FLOW_NOT_NEGOTIATED; |
| goto done; |
| } |
| buffer_failed: |
| { |
| GST_ELEMENT_ERROR (this, STREAM, DECODE, (NULL), |
| ("could not create buffer from GDP packet")); |
| ret = GST_FLOW_ERROR; |
| goto done; |
| } |
| push_error: |
| { |
| GST_WARNING_OBJECT (this, "pushing depayloaded buffer returned %d", ret); |
| goto done; |
| } |
| caps_failed: |
| { |
| GST_ELEMENT_ERROR (this, STREAM, DECODE, (NULL), |
| ("could not create caps from GDP packet")); |
| ret = GST_FLOW_ERROR; |
| goto done; |
| } |
| event_failed: |
| { |
| GST_ELEMENT_ERROR (this, STREAM, DECODE, (NULL), |
| ("could not create event from GDP packet")); |
| ret = GST_FLOW_ERROR; |
| goto done; |
| } |
| } |
| |
| static GstStateChangeReturn |
| gst_gdp_depay_change_state (GstElement * element, GstStateChange transition) |
| { |
| GstStateChangeReturn ret; |
| GstGDPDepay *this = GST_GDP_DEPAY (element); |
| |
| ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); |
| |
| switch (transition) { |
| case GST_STATE_CHANGE_PAUSED_TO_READY: |
| if (this->caps) { |
| gst_caps_unref (this->caps); |
| this->caps = NULL; |
| } |
| gst_adapter_clear (this->adapter); |
| break; |
| default: |
| break; |
| } |
| return ret; |
| } |
| |
| gboolean |
| gst_gdp_depay_plugin_init (GstPlugin * plugin) |
| { |
| if (!gst_element_register (plugin, "gdpdepay", GST_RANK_NONE, |
| GST_TYPE_GDP_DEPAY)) |
| return FALSE; |
| |
| return TRUE; |
| } |