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368 lines
11 KiB
C
368 lines
11 KiB
C
/*
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* GStreamer
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* Copyright (c) 2005 INdT.
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* @author Andre Moreira Magalhaes <andre.magalhaes@indt.org.br>
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* @author Rob Taylor <robtaylor@fastmail.fm>
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* @author Philippe Khalaf <burger@speedy.org>
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* @author Ole André Vadla Ravnås <oleavr@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:element-mimdec
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* @see_also: mimenc
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*
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* The MIMIC codec is used by MSN Messenger's webcam support. It consumes the
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* TCP header for the MIMIC codec.
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*
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* Its fourcc is ML20.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gst/gst.h>
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#include "gstmimdec.h"
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GST_DEBUG_CATEGORY (mimdec_debug);
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#define GST_CAT_DEFAULT (mimdec_debug)
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static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("video/x-mimic")
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);
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static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("video/x-raw, format= (string) \"RGB\", "
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"framerate = (fraction) 0/1, width = (int) 320, height = (int) 240;"
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"video/x-raw, format= (string) \"RGB\", "
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"framerate = (fraction) 0/1, width = (int) 160, height = (int) 120")
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);
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static void gst_mim_dec_finalize (GObject * object);
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static GstFlowReturn gst_mim_dec_chain (GstPad * pad, GstObject * parent,
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GstBuffer * in);
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static GstStateChangeReturn
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gst_mim_dec_change_state (GstElement * element, GstStateChange transition);
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static gboolean gst_mim_dec_sink_event (GstPad * pad, GstObject * parent,
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GstEvent * event);
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G_DEFINE_TYPE (GstMimDec, gst_mim_dec, GST_TYPE_ELEMENT);
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static void
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gst_mim_dec_class_init (GstMimDecClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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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_DEBUG_FUNCPTR (gst_mim_dec_change_state);
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&src_factory));
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&sink_factory));
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gst_element_class_set_static_metadata (gstelement_class,
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"Mimic Decoder",
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"Codec/Decoder/Video",
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"MSN Messenger compatible Mimic video decoder element",
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"Andre Moreira Magalhaes <andre.magalhaes@indt.org.br>, "
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"Rob Taylor <robtaylor@fastmail.fm>, "
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"Philippe Khalaf <burger@speedy.org>, "
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"Ole André Vadla Ravnås <oleavr@gmail.com>,"
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"Olivier Crête <olivier.crete@collabora.co.uk");
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gobject_class->finalize = gst_mim_dec_finalize;
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GST_DEBUG_CATEGORY_INIT (mimdec_debug, "mimdec", 0, "Mimic decoder plugin");
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}
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static void
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gst_mim_dec_init (GstMimDec * mimdec)
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{
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mimdec->sinkpad = gst_pad_new_from_static_template (&sink_factory, "sink");
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gst_pad_use_fixed_caps (mimdec->sinkpad);
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gst_pad_set_chain_function (mimdec->sinkpad,
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GST_DEBUG_FUNCPTR (gst_mim_dec_chain));
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gst_pad_set_event_function (mimdec->sinkpad,
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GST_DEBUG_FUNCPTR (gst_mim_dec_sink_event));
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gst_element_add_pad (GST_ELEMENT (mimdec), mimdec->sinkpad);
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mimdec->srcpad = gst_pad_new_from_static_template (&src_factory, "src");
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gst_pad_use_fixed_caps (mimdec->srcpad);
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gst_element_add_pad (GST_ELEMENT (mimdec), mimdec->srcpad);
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mimdec->adapter = gst_adapter_new ();
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mimdec->dec = NULL;
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mimdec->buffer_size = -1;
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}
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static void
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gst_mim_dec_finalize (GObject * object)
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{
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GstMimDec *mimdec = GST_MIM_DEC (object);
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gst_adapter_clear (mimdec->adapter);
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g_object_unref (mimdec->adapter);
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G_OBJECT_CLASS (gst_mim_dec_parent_class)->finalize (object);
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}
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static GstFlowReturn
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gst_mim_dec_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
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{
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GstMimDec *mimdec = GST_MIM_DEC (parent);
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GstBuffer *out_buf;
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const guchar *header, *frame_body;
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guint32 fourcc;
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guint16 header_size;
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gint width, height;
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GstCaps *caps;
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GstFlowReturn res = GST_FLOW_OK;
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GstClockTime in_time = GST_BUFFER_TIMESTAMP (buf);
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GstEvent *event = NULL;
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gboolean result = TRUE;
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guint32 payload_size;
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guint32 current_ts;
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GstMapInfo map;
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gst_adapter_push (mimdec->adapter, buf);
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/* do we have enough bytes to read a header */
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while (gst_adapter_available (mimdec->adapter) >= 24) {
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header = gst_adapter_map (mimdec->adapter, 24);
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header_size = header[0];
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if (header_size != 24) {
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gst_adapter_unmap (mimdec->adapter);
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gst_adapter_flush (mimdec->adapter, 24);
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GST_ELEMENT_ERROR (mimdec, STREAM, DECODE, (NULL),
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("invalid frame: header size %d incorrect", header_size));
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return GST_FLOW_ERROR;
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}
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if (header[1] == 1) {
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/* This is a a paused frame, skip it */
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gst_adapter_unmap (mimdec->adapter);
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gst_adapter_flush (mimdec->adapter, 24);
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continue;
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}
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fourcc = GUINT32_FROM_LE (*((guint32 *) (header + 12)));
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if (GST_MAKE_FOURCC ('M', 'L', '2', '0') != fourcc) {
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gst_adapter_unmap (mimdec->adapter);
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gst_adapter_flush (mimdec->adapter, 24);
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GST_ELEMENT_ERROR (mimdec, STREAM, WRONG_TYPE, (NULL),
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("invalid frame: unknown FOURCC code %X (%" GST_FOURCC_FORMAT ")",
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fourcc, GST_FOURCC_ARGS (fourcc)));
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return GST_FLOW_ERROR;
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}
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payload_size = GUINT32_FROM_LE (*((guint32 *) (header + 8)));
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current_ts = GUINT32_FROM_LE (*((guint32 *) (header + 20)));
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gst_adapter_unmap (mimdec->adapter);
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GST_LOG_OBJECT (mimdec, "Got packet, payload size %d", payload_size);
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if (gst_adapter_available (mimdec->adapter) < payload_size + 24)
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return GST_FLOW_OK;
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/* We have a whole packet and have read the header, lets flush it out */
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gst_adapter_flush (mimdec->adapter, 24);
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frame_body = gst_adapter_map (mimdec->adapter, payload_size);
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if (mimdec->buffer_size < 0) {
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/* Check if its a keyframe, otherwise skip it */
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if (GUINT32_FROM_LE (*((guint32 *) (frame_body + 12))) != 0) {
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gst_adapter_unmap (mimdec->adapter);
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gst_adapter_flush (mimdec->adapter, payload_size);
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return GST_FLOW_OK;
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}
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if (!mimic_decoder_init (mimdec->dec, frame_body)) {
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gst_adapter_unmap (mimdec->adapter);
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gst_adapter_flush (mimdec->adapter, payload_size);
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GST_ELEMENT_ERROR (mimdec, LIBRARY, INIT, (NULL),
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("mimic_decoder_init error"));
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return GST_FLOW_ERROR;
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}
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if (!mimic_get_property (mimdec->dec, "buffer_size",
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&mimdec->buffer_size)) {
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gst_adapter_unmap (mimdec->adapter);
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gst_adapter_flush (mimdec->adapter, payload_size);
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GST_ELEMENT_ERROR (mimdec, LIBRARY, INIT, (NULL),
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("mimic_get_property('buffer_size') error"));
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return GST_FLOW_ERROR;
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}
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mimic_get_property (mimdec->dec, "width", &width);
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mimic_get_property (mimdec->dec, "height", &height);
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GST_DEBUG_OBJECT (mimdec,
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"Initialised decoder with %d x %d payload size %d buffer_size %d",
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width, height, payload_size, mimdec->buffer_size);
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caps = gst_caps_new_simple ("video/x-raw",
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"format", G_TYPE_STRING, "RGB",
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"framerate", GST_TYPE_FRACTION, 0, 1,
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"width", G_TYPE_INT, width, "height", G_TYPE_INT, height, NULL);
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gst_pad_set_caps (mimdec->srcpad, caps);
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gst_caps_unref (caps);
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}
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if (mimdec->need_segment) {
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GstSegment segment;
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gst_segment_init (&segment, GST_FORMAT_TIME);
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if (GST_CLOCK_TIME_IS_VALID (in_time))
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segment.start = in_time;
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else
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segment.start = current_ts * GST_MSECOND;
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event = gst_event_new_segment (&segment);
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}
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mimdec->need_segment = FALSE;
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if (event)
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result = gst_pad_push_event (mimdec->srcpad, event);
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event = NULL;
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if (!result) {
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GST_WARNING_OBJECT (mimdec, "gst_pad_push_event failed");
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return GST_FLOW_ERROR;
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}
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out_buf = gst_buffer_new_allocate (NULL, mimdec->buffer_size, NULL);
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gst_buffer_map (out_buf, &map, GST_MAP_READWRITE);
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if (!mimic_decode_frame (mimdec->dec, frame_body, map.data)) {
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GST_WARNING_OBJECT (mimdec, "mimic_decode_frame error\n");
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gst_adapter_flush (mimdec->adapter, payload_size);
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gst_buffer_unmap (out_buf, &map);
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gst_buffer_unref (out_buf);
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GST_ELEMENT_ERROR (mimdec, STREAM, DECODE, (NULL),
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("mimic_decode_frame error"));
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return GST_FLOW_ERROR;
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}
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gst_buffer_unmap (out_buf, &map);
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gst_adapter_flush (mimdec->adapter, payload_size);
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if (GST_CLOCK_TIME_IS_VALID (in_time))
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GST_BUFFER_TIMESTAMP (out_buf) = in_time;
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else
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GST_BUFFER_TIMESTAMP (out_buf) = current_ts * GST_MSECOND;
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res = gst_pad_push (mimdec->srcpad, out_buf);
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if (res != GST_FLOW_OK)
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break;
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}
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return res;
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}
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static GstStateChangeReturn
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gst_mim_dec_change_state (GstElement * element, GstStateChange transition)
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{
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GstMimDec *mimdec;
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GstStateChangeReturn ret;
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mimdec = GST_MIM_DEC (element);
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switch (transition) {
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case GST_STATE_CHANGE_READY_TO_PAUSED:
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mimdec->buffer_size = -1;
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mimdec->dec = mimic_open ();
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if (!mimdec) {
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GST_ERROR_OBJECT (mimdec, "mimic_open failed");
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return GST_STATE_CHANGE_FAILURE;
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}
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mimdec->need_segment = TRUE;
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gst_adapter_clear (mimdec->adapter);
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break;
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default:
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break;
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}
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ret = GST_ELEMENT_CLASS (gst_mim_dec_parent_class)->change_state (element,
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transition);
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if (ret == GST_STATE_CHANGE_FAILURE)
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return ret;
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switch (transition) {
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case GST_STATE_CHANGE_PAUSED_TO_READY:
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if (mimdec->dec != NULL) {
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mimic_close (mimdec->dec);
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mimdec->dec = NULL;
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}
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break;
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default:
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break;
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}
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return ret;
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}
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static gboolean
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gst_mim_dec_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
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{
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gboolean res = TRUE;
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gboolean forward = TRUE;
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GstMimDec *mimdec = GST_MIM_DEC (parent);
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/*
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* Ignore upstream segment event, its EVIL, we should implement
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* proper seeking instead
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*/
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_SEGMENT:
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forward = FALSE;
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break;
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case GST_EVENT_STREAM_START:
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case GST_EVENT_FLUSH_STOP:
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case GST_EVENT_EOS:
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gst_adapter_clear (mimdec->adapter);
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break;
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default:
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break;
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}
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if (forward)
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res = gst_pad_event_default (pad, parent, event);
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else
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gst_event_unref (event);
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return res;
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}
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