gstreamer/ext/mimic/gstmimdec.c
2012-11-04 00:09:59 +00:00

369 lines
11 KiB
C

/*
* GStreamer
* Copyright (c) 2005 INdT.
* @author Andre Moreira Magalhaes <andre.magalhaes@indt.org.br>
* @author Rob Taylor <robtaylor@fastmail.fm>
* @author Philippe Khalaf <burger@speedy.org>
* @author Ole André Vadla Ravnås <oleavr@gmail.com>
*
* 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-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 <gst/gst.h>
#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, format= (string) \"RGB\", "
"framerate = (fraction) 0/1, width = (int) 320, height = (int) 240;"
"video/x-raw, format= (string) \"RGB\", "
"framerate = (fraction) 0/1, width = (int) 160, height = (int) 120")
);
static void gst_mim_dec_finalize (GObject * object);
static GstFlowReturn gst_mim_dec_chain (GstPad * pad, GstObject * parent,
GstBuffer * in);
static GstStateChangeReturn
gst_mim_dec_change_state (GstElement * element, GstStateChange transition);
static gboolean gst_mim_dec_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
G_DEFINE_TYPE (GstMimDec, gst_mim_dec, GST_TYPE_ELEMENT);
static void
gst_mim_dec_class_init (GstMimDecClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_mim_dec_change_state);
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&src_factory));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&sink_factory));
gst_element_class_set_static_metadata (gstelement_class,
"Mimic Decoder",
"Codec/Decoder/Video",
"MSN Messenger compatible Mimic video decoder element",
"Andre Moreira Magalhaes <andre.magalhaes@indt.org.br>, "
"Rob Taylor <robtaylor@fastmail.fm>, "
"Philippe Khalaf <burger@speedy.org>, "
"Ole André Vadla Ravnås <oleavr@gmail.com>,"
"Olivier Crête <olivier.crete@collabora.co.uk");
gobject_class->finalize = gst_mim_dec_finalize;
GST_DEBUG_CATEGORY_INIT (mimdec_debug, "mimdec", 0, "Mimic decoder plugin");
}
static void
gst_mim_dec_init (GstMimDec * mimdec)
{
mimdec->sinkpad = gst_pad_new_from_static_template (&sink_factory, "sink");
gst_pad_use_fixed_caps (mimdec->sinkpad);
gst_pad_set_chain_function (mimdec->sinkpad,
GST_DEBUG_FUNCPTR (gst_mim_dec_chain));
gst_pad_set_event_function (mimdec->sinkpad,
GST_DEBUG_FUNCPTR (gst_mim_dec_sink_event));
gst_element_add_pad (GST_ELEMENT (mimdec), mimdec->sinkpad);
mimdec->srcpad = gst_pad_new_from_static_template (&src_factory, "src");
gst_pad_use_fixed_caps (mimdec->srcpad);
gst_element_add_pad (GST_ELEMENT (mimdec), mimdec->srcpad);
mimdec->adapter = gst_adapter_new ();
mimdec->dec = NULL;
mimdec->buffer_size = -1;
}
static void
gst_mim_dec_finalize (GObject * object)
{
GstMimDec *mimdec = GST_MIM_DEC (object);
gst_adapter_clear (mimdec->adapter);
g_object_unref (mimdec->adapter);
G_OBJECT_CLASS (gst_mim_dec_parent_class)->finalize (object);
}
static GstFlowReturn
gst_mim_dec_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstMimDec *mimdec = GST_MIM_DEC (parent);
GstBuffer *out_buf;
const 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 (buf);
GstEvent *event = NULL;
gboolean result = TRUE;
guint32 payload_size;
guint32 current_ts;
GstMapInfo map;
gst_adapter_push (mimdec->adapter, buf);
/* do we have enough bytes to read a header */
while (gst_adapter_available (mimdec->adapter) >= 24) {
header = gst_adapter_map (mimdec->adapter, 24);
header_size = header[0];
if (header_size != 24) {
gst_adapter_unmap (mimdec->adapter);
gst_adapter_flush (mimdec->adapter, 24);
GST_ELEMENT_ERROR (mimdec, STREAM, DECODE, (NULL),
("invalid frame: header size %d incorrect", header_size));
return GST_FLOW_ERROR;
}
if (header[1] == 1) {
/* This is a a paused frame, skip it */
gst_adapter_unmap (mimdec->adapter);
gst_adapter_flush (mimdec->adapter, 24);
continue;
}
fourcc = GUINT32_FROM_LE (*((guint32 *) (header + 12)));
if (GST_MAKE_FOURCC ('M', 'L', '2', '0') != fourcc) {
gst_adapter_unmap (mimdec->adapter);
gst_adapter_flush (mimdec->adapter, 24);
GST_ELEMENT_ERROR (mimdec, STREAM, WRONG_TYPE, (NULL),
("invalid frame: unknown FOURCC code %X (%" GST_FOURCC_FORMAT ")",
fourcc, GST_FOURCC_ARGS (fourcc)));
return GST_FLOW_ERROR;
}
payload_size = GUINT32_FROM_LE (*((guint32 *) (header + 8)));
current_ts = GUINT32_FROM_LE (*((guint32 *) (header + 20)));
gst_adapter_unmap (mimdec->adapter);
GST_LOG_OBJECT (mimdec, "Got packet, payload size %d", payload_size);
if (gst_adapter_available (mimdec->adapter) < payload_size + 24)
return GST_FLOW_OK;
/* We have a whole packet and have read the header, lets flush it out */
gst_adapter_flush (mimdec->adapter, 24);
frame_body = gst_adapter_map (mimdec->adapter, payload_size);
if (mimdec->buffer_size < 0) {
/* Check if its a keyframe, otherwise skip it */
if (GUINT32_FROM_LE (*((guint32 *) (frame_body + 12))) != 0) {
gst_adapter_unmap (mimdec->adapter);
gst_adapter_flush (mimdec->adapter, payload_size);
return GST_FLOW_OK;
}
if (!mimic_decoder_init (mimdec->dec, frame_body)) {
gst_adapter_unmap (mimdec->adapter);
gst_adapter_flush (mimdec->adapter, payload_size);
GST_ELEMENT_ERROR (mimdec, LIBRARY, INIT, (NULL),
("mimic_decoder_init error"));
return GST_FLOW_ERROR;
}
if (!mimic_get_property (mimdec->dec, "buffer_size",
&mimdec->buffer_size)) {
gst_adapter_unmap (mimdec->adapter);
gst_adapter_flush (mimdec->adapter, payload_size);
GST_ELEMENT_ERROR (mimdec, LIBRARY, INIT, (NULL),
("mimic_get_property('buffer_size') error"));
return GST_FLOW_ERROR;
}
mimic_get_property (mimdec->dec, "width", &width);
mimic_get_property (mimdec->dec, "height", &height);
GST_DEBUG_OBJECT (mimdec,
"Initialised decoder with %d x %d payload size %d buffer_size %d",
width, height, payload_size, mimdec->buffer_size);
caps = gst_caps_new_simple ("video/x-raw",
"format", G_TYPE_STRING, "RGB",
"framerate", GST_TYPE_FRACTION, 0, 1,
"width", G_TYPE_INT, width, "height", G_TYPE_INT, height, NULL);
gst_pad_set_caps (mimdec->srcpad, caps);
gst_caps_unref (caps);
}
if (mimdec->need_segment) {
GstSegment segment;
gst_segment_init (&segment, GST_FORMAT_TIME);
if (GST_CLOCK_TIME_IS_VALID (in_time))
segment.start = in_time;
else
segment.start = current_ts * GST_MSECOND;
event = gst_event_new_segment (&segment);
}
mimdec->need_segment = FALSE;
if (event)
result = gst_pad_push_event (mimdec->srcpad, event);
event = NULL;
if (!result) {
GST_WARNING_OBJECT (mimdec, "gst_pad_push_event failed");
return GST_FLOW_ERROR;
}
out_buf = gst_buffer_new_allocate (NULL, mimdec->buffer_size, NULL);
gst_buffer_map (out_buf, &map, GST_MAP_READWRITE);
if (!mimic_decode_frame (mimdec->dec, frame_body, map.data)) {
GST_WARNING_OBJECT (mimdec, "mimic_decode_frame error\n");
gst_adapter_flush (mimdec->adapter, payload_size);
gst_buffer_unmap (out_buf, &map);
gst_buffer_unref (out_buf);
GST_ELEMENT_ERROR (mimdec, STREAM, DECODE, (NULL),
("mimic_decode_frame error"));
return GST_FLOW_ERROR;
}
gst_buffer_unmap (out_buf, &map);
gst_adapter_flush (mimdec->adapter, payload_size);
if (GST_CLOCK_TIME_IS_VALID (in_time))
GST_BUFFER_TIMESTAMP (out_buf) = in_time;
else
GST_BUFFER_TIMESTAMP (out_buf) = current_ts * GST_MSECOND;
res = gst_pad_push (mimdec->srcpad, out_buf);
if (res != GST_FLOW_OK)
break;
}
return res;
}
static GstStateChangeReturn
gst_mim_dec_change_state (GstElement * element, GstStateChange transition)
{
GstMimDec *mimdec;
GstStateChangeReturn ret;
mimdec = GST_MIM_DEC (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
mimdec->buffer_size = -1;
mimdec->dec = mimic_open ();
if (!mimdec) {
GST_ERROR_OBJECT (mimdec, "mimic_open failed");
return GST_STATE_CHANGE_FAILURE;
}
mimdec->need_segment = TRUE;
gst_adapter_clear (mimdec->adapter);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (gst_mim_dec_parent_class)->change_state (element,
transition);
if (ret == GST_STATE_CHANGE_FAILURE)
return ret;
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
if (mimdec->dec != NULL) {
mimic_close (mimdec->dec);
mimdec->dec = NULL;
}
break;
default:
break;
}
return ret;
}
static gboolean
gst_mim_dec_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
gboolean res = TRUE;
gboolean forward = TRUE;
GstMimDec *mimdec = GST_MIM_DEC (parent);
/*
* Ignore upstream segment event, its EVIL, we should implement
* proper seeking instead
*/
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEGMENT:
forward = FALSE;
break;
case GST_EVENT_STREAM_START:
case GST_EVENT_FLUSH_STOP:
case GST_EVENT_EOS:
mimdec->need_segment = FALSE;
gst_adapter_clear (mimdec->adapter);
break;
default:
break;
}
if (forward)
res = gst_pad_event_default (pad, parent, event);
else
gst_event_unref (event);
return res;
}