/* * GStreamer * Copyright (c) 2005 INdT. * @author Andre Moreira Magalhaes * @author Rob Taylor * @author Philippe Khalaf * @author Ole André Vadla Ravnås * * 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., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /** * SECTION:element-mimdec * @see_also: mimenc * * The MIMIC codec is used by MSN Messenger's webcam support. It consumes the * TCP header for the MIMIC codec. * * Its fourcc is ML20. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include "gstmimdec.h" GST_DEBUG_CATEGORY (mimdec_debug); #define GST_CAT_DEFAULT (mimdec_debug) static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/x-mimic") ); static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/x-raw-rgb, " "bpp = (int) 24, " "depth = (int) 24, " "endianness = (int) 4321, " "framerate = (fraction) [ 0/1, 30/1 ], " "red_mask = (int) 16711680, " "green_mask = (int) 65280, " "blue_mask = (int) 255, " "height = (int) [16, 4096], " "width = (int) [16, 4096]") ); static void gst_mimdec_finalize (GObject * object); static GstFlowReturn gst_mimdec_chain (GstPad * pad, GstBuffer * in); static GstStateChangeReturn gst_mimdec_change_state (GstElement * element, GstStateChange transition); static gboolean gst_mimdec_sink_event (GstPad * pad, GstEvent * event); GST_BOILERPLATE (GstMimDec, gst_mimdec, GstElement, GST_TYPE_ELEMENT); static void gst_mimdec_base_init (gpointer klass) { GstElementClass *element_class = GST_ELEMENT_CLASS (klass); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&src_factory)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&sink_factory)); gst_element_class_set_details_simple (element_class, "MimDec", "Codec/Decoder/Video", "Mimic decoder", "Andre Moreira Magalhaes , " "Rob Taylor , " "Philippe Khalaf , " "Ole André Vadla Ravnås "); } static void gst_mimdec_class_init (GstMimDecClass * klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; gobject_class = (GObjectClass *) klass; gstelement_class = (GstElementClass *) klass; gstelement_class->change_state = gst_mimdec_change_state; gobject_class->finalize = gst_mimdec_finalize; GST_DEBUG_CATEGORY_INIT (mimdec_debug, "mimdec", 0, "Mimic decoder plugin"); } static void gst_mimdec_init (GstMimDec * mimdec, GstMimDecClass * klass) { mimdec->sinkpad = gst_pad_new_from_static_template (&sink_factory, "sink"); gst_element_add_pad (GST_ELEMENT (mimdec), mimdec->sinkpad); gst_pad_set_chain_function (mimdec->sinkpad, gst_mimdec_chain); gst_pad_set_event_function (mimdec->sinkpad, gst_mimdec_sink_event); mimdec->srcpad = gst_pad_new_from_static_template (&src_factory, "src"); gst_element_add_pad (GST_ELEMENT (mimdec), mimdec->srcpad); mimdec->adapter = gst_adapter_new (); mimdec->dec = NULL; mimdec->buffer_size = -1; mimdec->have_header = FALSE; mimdec->payload_size = -1; mimdec->current_ts = -1; mimdec->need_newsegment = TRUE; } static void gst_mimdec_finalize (GObject * object) { GstMimDec *mimdec = GST_MIMDEC (object); gst_adapter_clear (mimdec->adapter); g_object_unref (mimdec->adapter); GST_CALL_PARENT (G_OBJECT_CLASS, finalize, (object)); } static GstFlowReturn gst_mimdec_chain (GstPad * pad, GstBuffer * in) { GstMimDec *mimdec; GstBuffer *out_buf, *buf; guchar *header, *frame_body; guint32 fourcc; guint16 header_size; gint width, height; GstCaps *caps; GstFlowReturn res = GST_FLOW_OK; GstClockTime in_time = GST_BUFFER_TIMESTAMP (in); GstEvent *event = NULL; gboolean result = TRUE; GST_DEBUG ("in gst_mimdec_chain"); g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR); mimdec = GST_MIMDEC (gst_pad_get_parent (pad)); g_return_val_if_fail (GST_IS_MIMDEC (mimdec), GST_FLOW_ERROR); buf = GST_BUFFER (in); gst_adapter_push (mimdec->adapter, buf); GST_OBJECT_LOCK (mimdec); // do we have enough bytes to read a header while (gst_adapter_available (mimdec->adapter) >= (mimdec->have_header ? mimdec->payload_size : 24)) { if (!mimdec->have_header) { header = (guchar *) gst_adapter_peek (mimdec->adapter, 24); header_size = header[0]; if (header_size != 24) { GST_WARNING_OBJECT (mimdec, "invalid frame: header size %d incorrect", header_size); gst_adapter_flush (mimdec->adapter, 24); res = GST_FLOW_ERROR; goto out; } if (header[1] == 1) { /* This is a a paused frame, skip it */ gst_adapter_flush (mimdec->adapter, 24); continue; } fourcc = GUINT32_FROM_LE (*((guint32 *) (header + 12))); if (GST_MAKE_FOURCC ('M', 'L', '2', '0') != fourcc) { GST_WARNING_OBJECT (mimdec, "invalid frame: unknown FOURCC code" " %X (%" GST_FOURCC_FORMAT ")", fourcc, GST_FOURCC_ARGS (fourcc)); gst_adapter_flush (mimdec->adapter, 24); res = GST_FLOW_ERROR; goto out; } mimdec->payload_size = GUINT32_FROM_LE (*((guint32 *) (header + 8))); mimdec->current_ts = GUINT32_FROM_LE (*((guint32 *) (header + 20))); GST_DEBUG ("Got packet, payload size %d", mimdec->payload_size); gst_adapter_flush (mimdec->adapter, 24); mimdec->have_header = TRUE; } if (gst_adapter_available (mimdec->adapter) < mimdec->payload_size) { goto out; } frame_body = (guchar *) gst_adapter_peek (mimdec->adapter, mimdec->payload_size); if (mimdec->dec == NULL) { /* Check if its a keyframe, otherwise skip it */ if (GUINT32_FROM_LE (*((guint32 *) (frame_body + 12))) != 0) { gst_adapter_flush (mimdec->adapter, mimdec->payload_size); mimdec->have_header = FALSE; res = GST_FLOW_OK; goto out; } mimdec->dec = mimic_open (); if (mimdec->dec == NULL) { GST_WARNING_OBJECT (mimdec, "mimic_open error\n"); gst_adapter_flush (mimdec->adapter, mimdec->payload_size); mimdec->have_header = FALSE; res = GST_FLOW_ERROR; goto out; } if (!mimic_decoder_init (mimdec->dec, frame_body)) { GST_WARNING_OBJECT (mimdec, "mimic_decoder_init error\n"); mimic_close (mimdec->dec); mimdec->dec = NULL; gst_adapter_flush (mimdec->adapter, mimdec->payload_size); mimdec->have_header = FALSE; res = GST_FLOW_ERROR; goto out; } if (!mimic_get_property (mimdec->dec, "buffer_size", &mimdec->buffer_size)) { GST_WARNING_OBJECT (mimdec, "mimic_get_property('buffer_size') error\n"); mimic_close (mimdec->dec); mimdec->dec = NULL; gst_adapter_flush (mimdec->adapter, mimdec->payload_size); mimdec->have_header = FALSE; res = GST_FLOW_ERROR; goto out; } } if (mimdec->need_newsegment) { if (GST_CLOCK_TIME_IS_VALID (in_time)) event = gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME, in_time, -1, 0); else event = gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME, mimdec->current_ts * GST_MSECOND, -1, 0); } mimdec->need_newsegment = FALSE; GST_OBJECT_UNLOCK (mimdec); if (event) result = gst_pad_push_event (mimdec->srcpad, event); event = NULL; GST_OBJECT_LOCK (mimdec); if (!result) { GST_WARNING_OBJECT (mimdec, "gst_pad_push_event failed"); res = GST_FLOW_ERROR; goto out; } out_buf = gst_buffer_new_and_alloc (mimdec->buffer_size); if (!mimic_decode_frame (mimdec->dec, frame_body, GST_BUFFER_DATA (out_buf))) { GST_WARNING_OBJECT (mimdec, "mimic_decode_frame error\n"); gst_adapter_flush (mimdec->adapter, mimdec->payload_size); mimdec->have_header = FALSE; gst_buffer_unref (out_buf); res = GST_FLOW_ERROR; goto out; } if (GST_CLOCK_TIME_IS_VALID (in_time)) GST_BUFFER_TIMESTAMP (out_buf) = in_time; else GST_BUFFER_TIMESTAMP (out_buf) = mimdec->current_ts * GST_MSECOND; mimic_get_property (mimdec->dec, "width", &width); mimic_get_property (mimdec->dec, "height", &height); GST_DEBUG_OBJECT (mimdec, "got WxH %d x %d payload size %d buffer_size %d", width, height, mimdec->payload_size, mimdec->buffer_size); caps = gst_caps_new_simple ("video/x-raw-rgb", "bpp", G_TYPE_INT, 24, "depth", G_TYPE_INT, 24, "endianness", G_TYPE_INT, 4321, "framerate", GST_TYPE_FRACTION, 7, 1, "red_mask", G_TYPE_INT, 16711680, "green_mask", G_TYPE_INT, 65280, "blue_mask", G_TYPE_INT, 255, "width", G_TYPE_INT, width, "height", G_TYPE_INT, height, NULL); gst_buffer_set_caps (out_buf, caps); gst_caps_unref (caps); GST_OBJECT_UNLOCK (mimdec); res = gst_pad_push (mimdec->srcpad, out_buf); GST_OBJECT_LOCK (mimdec); gst_adapter_flush (mimdec->adapter, mimdec->payload_size); mimdec->have_header = FALSE; } out: GST_OBJECT_UNLOCK (mimdec); gst_object_unref (mimdec); return res; } static GstStateChangeReturn gst_mimdec_change_state (GstElement * element, GstStateChange transition) { GstMimDec *mimdec; mimdec = GST_MIMDEC (element); switch (transition) { case GST_STATE_CHANGE_READY_TO_NULL: GST_OBJECT_LOCK (element); if (mimdec->dec != NULL) { mimic_close (mimdec->dec); mimdec->dec = NULL; mimdec->buffer_size = -1; mimdec->have_header = FALSE; mimdec->payload_size = -1; mimdec->current_ts = -1; } GST_OBJECT_UNLOCK (element); break; case GST_STATE_CHANGE_READY_TO_PAUSED: GST_OBJECT_LOCK (element); mimdec->need_newsegment = TRUE; GST_OBJECT_UNLOCK (element); break; default: break; } return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); } static gboolean gst_mimdec_sink_event (GstPad * pad, GstEvent * event) { gboolean res = TRUE; GstMimDec *mimdec = GST_MIMDEC (gst_pad_get_parent (pad)); /* * Ignore upstream newsegment event, its EVIL, we should implement * proper seeking instead */ switch (GST_EVENT_TYPE (event)) { case GST_EVENT_NEWSEGMENT: { gboolean update; GstFormat format; gdouble rate, arate; gint64 start, stop, time; gst_event_parse_new_segment_full (event, &update, &rate, &arate, &format, &start, &stop, &time); /* we need TIME and a positive rate */ if (format != GST_FORMAT_TIME) goto newseg_wrong_format; if (rate <= 0.0) goto newseg_wrong_rate; GST_OBJECT_LOCK (mimdec); mimdec->need_newsegment = FALSE; GST_OBJECT_UNLOCK (mimdec); break; } case GST_EVENT_FLUSH_STOP: GST_OBJECT_LOCK (mimdec); mimdec->need_newsegment = TRUE; GST_OBJECT_UNLOCK (mimdec); break; default: break; } res = gst_pad_push_event (mimdec->srcpad, event); done: gst_object_unref (mimdec); return res; newseg_wrong_format: { GST_DEBUG_OBJECT (mimdec, "received non TIME newsegment"); gst_event_unref (event); goto done; } newseg_wrong_rate: { GST_DEBUG_OBJECT (mimdec, "negative rates not supported yet"); gst_event_unref (event); goto done; } }