gstreamer/ext/jpeg/gstsmokedec.c

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
/*#define DEBUG_ENABLED*/
#include "gstsmokedec.h"
#include <gst/video/video.h>
/* elementfactory information */
GstElementDetails gst_smokedec_details = {
"Smoke video decoder",
"Codec/Decoder/Image",
"Decode video from Smoke format",
"Wim Taymans <wim@fluendo.com>",
};
GST_DEBUG_CATEGORY (smokedec_debug);
#define GST_CAT_DEFAULT smokedec_debug
/* SmokeDec signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0
/* FILL ME */
};
static void gst_smokedec_base_init (gpointer g_class);
static void gst_smokedec_class_init (GstSmokeDec * klass);
static void gst_smokedec_init (GstSmokeDec * smokedec);
static void gst_smokedec_chain (GstPad * pad, GstData * _data);
static GstPadLinkReturn gst_smokedec_link (GstPad * pad, const GstCaps * caps);
static GstElementClass *parent_class = NULL;
/*static guint gst_smokedec_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_smokedec_get_type (void)
{
static GType smokedec_type = 0;
if (!smokedec_type) {
static const GTypeInfo smokedec_info = {
sizeof (GstSmokeDecClass),
gst_smokedec_base_init,
NULL,
(GClassInitFunc) gst_smokedec_class_init,
NULL,
NULL,
sizeof (GstSmokeDec),
0,
(GInstanceInitFunc) gst_smokedec_init,
};
smokedec_type =
g_type_register_static (GST_TYPE_ELEMENT, "GstSmokeDec", &smokedec_info,
0);
}
return smokedec_type;
}
static GstStaticPadTemplate gst_smokedec_src_pad_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("I420"))
);
static GstStaticPadTemplate gst_smokedec_sink_pad_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-smoke, "
"width = (int) [ 16, 4096 ], "
"height = (int) [ 16, 4096 ], " "framerate = (double) [ 1, MAX ]")
);
static void
gst_smokedec_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_smokedec_src_pad_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_smokedec_sink_pad_template));
gst_element_class_set_details (element_class, &gst_smokedec_details);
}
static void
gst_smokedec_class_init (GstSmokeDec * klass)
{
GstElementClass *gstelement_class;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
GST_DEBUG_CATEGORY_INIT (smokedec_debug, "smokedec", 0, "Smoke decoder");
}
static void
gst_smokedec_init (GstSmokeDec * smokedec)
{
GST_DEBUG ("gst_smokedec_init: initializing");
/* create the sink and src pads */
smokedec->sinkpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&gst_smokedec_sink_pad_template), "sink");
gst_element_add_pad (GST_ELEMENT (smokedec), smokedec->sinkpad);
gst_pad_set_chain_function (smokedec->sinkpad, gst_smokedec_chain);
gst_pad_set_link_function (smokedec->sinkpad, gst_smokedec_link);
smokedec->srcpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&gst_smokedec_src_pad_template), "src");
gst_pad_use_explicit_caps (smokedec->srcpad);
gst_element_add_pad (GST_ELEMENT (smokedec), smokedec->srcpad);
/* reset the initial video state */
smokedec->format = -1;
smokedec->width = -1;
smokedec->height = -1;
smokedec->next_time = 0;
}
static GstPadLinkReturn
gst_smokedec_link (GstPad * pad, const GstCaps * caps)
{
GstSmokeDec *smokedec = GST_SMOKEDEC (gst_pad_get_parent (pad));
GstStructure *structure;
GstCaps *srccaps;
structure = gst_caps_get_structure (caps, 0);
gst_structure_get_double (structure, "framerate", &smokedec->fps);
gst_structure_get_int (structure, "width", &smokedec->width);
gst_structure_get_int (structure, "height", &smokedec->height);
srccaps = gst_caps_new_simple ("video/x-raw-yuv",
"format", GST_TYPE_FOURCC, GST_MAKE_FOURCC ('I', '4', '2', '0'),
"width", G_TYPE_INT, smokedec->width,
"height", G_TYPE_INT, smokedec->height,
"framerate", G_TYPE_DOUBLE, smokedec->fps, NULL);
/* at this point, we're pretty sure that this will be the output
* format, so we'll set it. */
gst_pad_set_explicit_caps (smokedec->srcpad, srccaps);
smokecodec_decode_new (&smokedec->info);
return GST_PAD_LINK_OK;
}
static void
gst_smokedec_chain (GstPad * pad, GstData * _data)
{
GstBuffer *buf = GST_BUFFER (_data);
GstSmokeDec *smokedec;
guchar *data, *outdata;
gulong size, outsize;
GstBuffer *outbuf;
SmokeCodecFlags flags;
GstClockTime time;
gint width, height;
gint fps_num, fps_denom;
smokedec = GST_SMOKEDEC (GST_OBJECT_PARENT (pad));
if (!GST_PAD_IS_LINKED (smokedec->srcpad)) {
gst_buffer_unref (buf);
return;
}
data = (guchar *) GST_BUFFER_DATA (buf);
size = GST_BUFFER_SIZE (buf);
time = GST_BUFFER_TIMESTAMP (buf);
GST_DEBUG ("gst_smokedec_chain: got buffer of %ld bytes in '%s'", size,
GST_OBJECT_NAME (smokedec));
if (data[0] == SMOKECODEC_TYPE_ID) {
smokecodec_parse_id (smokedec->info, data, size);
return;
}
GST_DEBUG ("gst_smokedec_chain: reading header %08lx", *(gulong *) data);
smokecodec_parse_header (smokedec->info, data, size, &flags, &width, &height,
&fps_num, &fps_denom);
outbuf = gst_buffer_new ();
outsize = GST_BUFFER_SIZE (outbuf) = width * height + width * height / 2;
outdata = g_malloc (outsize);
GST_BUFFER_DATA (outbuf) = outdata;
GST_BUFFER_MALLOCDATA (outbuf) = outdata;
GST_BUFFER_DURATION (outbuf) = GST_SECOND * fps_denom / fps_num;
GST_BUFFER_OFFSET (outbuf) = GST_BUFFER_OFFSET (buf);
if (time == GST_CLOCK_TIME_NONE) {
if (GST_BUFFER_OFFSET (buf) == -1) {
time = smokedec->next_time;
} else {
time = GST_BUFFER_OFFSET (buf) * GST_BUFFER_DURATION (outbuf);
}
}
GST_BUFFER_TIMESTAMP (outbuf) = time;
smokedec->next_time = time + GST_BUFFER_DURATION (outbuf);
if (smokedec->height != height) {
GstCaps *caps;
smokedec->height = height;
caps = gst_caps_new_simple ("video/x-raw-yuv",
"format", GST_TYPE_FOURCC, GST_MAKE_FOURCC ('I', '4', '2', '0'),
"width", G_TYPE_INT, width,
"height", G_TYPE_INT, height,
"framerate", G_TYPE_DOUBLE, ((double) fps_num) / fps_denom, NULL);
gst_pad_set_explicit_caps (smokedec->srcpad, caps);
gst_caps_free (caps);
}
if (smokedec->need_keyframe) {
if (flags & SMOKECODEC_KEYFRAME) {
smokedec->need_keyframe = FALSE;
} else {
GST_DEBUG_OBJECT (smokedec, "dropping buffer while waiting for keyframe");
gst_buffer_unref (buf);
return;
}
}
if (!smokedec->need_keyframe) {
smokecodec_decode (smokedec->info, data, size, outdata);
gst_buffer_unref (buf);
GST_DEBUG ("gst_smokedec_chain: sending buffer");
gst_pad_push (smokedec->srcpad, GST_DATA (outbuf));
}
}