gstreamer/ext/jpeg/gstsmokedec.c
2012-04-10 00:51:41 +01:00

332 lines
8.7 KiB
C

/* 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.
*/
/**
* SECTION:element-smokedec
*
* Decodes images in smoke format.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
/*#define DEBUG_ENABLED*/
#include "gstsmokedec.h"
#include <gst/video/video.h>
GST_DEBUG_CATEGORY_STATIC (smokedec_debug);
#define GST_CAT_DEFAULT smokedec_debug
/* SmokeDec signals and args */
enum
{
LAST_SIGNAL
};
enum
{
PROP_0
};
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_finalize (GObject * object);
static GstStateChangeReturn
gst_smokedec_change_state (GstElement * element, GstStateChange transition);
static GstFlowReturn gst_smokedec_chain (GstPad * pad, GstBuffer * buf);
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 = (fraction) [ 0/1, 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_static_metadata (element_class, "Smoke video decoder",
"Codec/Decoder/Video",
"Decode video from Smoke format", "Wim Taymans <wim@fluendo.com>");
}
static void
gst_smokedec_class_init (GstSmokeDec * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gobject_class->finalize = gst_smokedec_finalize;
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_smokedec_change_state);
GST_DEBUG_CATEGORY_INIT (smokedec_debug, "smokedec", 0, "Smoke decoder");
}
static void
gst_smokedec_init (GstSmokeDec * smokedec)
{
GST_DEBUG_OBJECT (smokedec, "gst_smokedec_init: initializing");
/* create the sink and src pads */
smokedec->sinkpad =
gst_pad_new_from_static_template (&gst_smokedec_sink_pad_template,
"sink");
gst_pad_set_chain_function (smokedec->sinkpad, gst_smokedec_chain);
gst_element_add_pad (GST_ELEMENT (smokedec), smokedec->sinkpad);
smokedec->srcpad =
gst_pad_new_from_static_template (&gst_smokedec_src_pad_template, "src");
gst_pad_use_fixed_caps (smokedec->srcpad);
gst_element_add_pad (GST_ELEMENT (smokedec), smokedec->srcpad);
smokecodec_decode_new (&smokedec->info);
}
static void
gst_smokedec_finalize (GObject * object)
{
GstSmokeDec *dec = GST_SMOKEDEC (object);
smokecodec_info_free (dec->info);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static GstFlowReturn
gst_smokedec_chain (GstPad * pad, GstBuffer * buf)
{
GstSmokeDec *smokedec;
guint8 *data, *outdata;
gulong size, outsize;
GstBuffer *outbuf;
SmokeCodecFlags flags;
GstClockTime time;
guint width, height;
guint fps_num, fps_denom;
gint smokeret;
GstFlowReturn ret;
smokedec = GST_SMOKEDEC (gst_pad_get_parent (pad));
data = GST_BUFFER_DATA (buf);
size = GST_BUFFER_SIZE (buf);
time = GST_BUFFER_TIMESTAMP (buf);
if (size < 1)
goto too_small;
GST_LOG_OBJECT (smokedec, "got buffer of %lu bytes", size);
/* have the ID packet. */
if (data[0] == SMOKECODEC_TYPE_ID) {
smokeret = smokecodec_parse_id (smokedec->info, data, size);
if (smokeret != SMOKECODEC_OK)
goto header_error;
ret = GST_FLOW_OK;
goto done;
}
/* now handle data packets */
GST_DEBUG_OBJECT (smokedec, "reading header %08lx", *(gulong *) data);
smokecodec_parse_header (smokedec->info, data, size, &flags, &width, &height,
&fps_num, &fps_denom);
if (smokedec->height != height || smokedec->width != width ||
smokedec->fps_num != fps_num || smokedec->fps_denom != fps_denom) {
GstCaps *caps;
GST_DEBUG_OBJECT (smokedec, "parameter change: %dx%d @ %d/%dfps",
width, height, fps_num, fps_denom);
smokedec->height = height;
smokedec->width = width;
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", GST_TYPE_FRACTION, fps_num, fps_denom, NULL);
gst_pad_set_caps (smokedec->srcpad, caps);
gst_caps_unref (caps);
}
if (smokedec->need_keyframe) {
if (!(flags & SMOKECODEC_KEYFRAME))
goto keyframe_skip;
smokedec->need_keyframe = FALSE;
}
outsize = width * height + width * height / 2;
outbuf = gst_buffer_new_and_alloc (outsize);
outdata = GST_BUFFER_DATA (outbuf);
GST_BUFFER_DURATION (outbuf) =
gst_util_uint64_scale_int (GST_SECOND, fps_denom, fps_num);
GST_BUFFER_OFFSET (outbuf) = GST_BUFFER_OFFSET (buf);
gst_buffer_set_caps (outbuf, GST_PAD_CAPS (smokedec->srcpad));
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;
if (time != -1)
smokedec->next_time = time + GST_BUFFER_DURATION (outbuf);
else
smokedec->next_time = -1;
smokeret = smokecodec_decode (smokedec->info, data, size, outdata);
if (smokeret != SMOKECODEC_OK)
goto decode_error;
GST_DEBUG_OBJECT (smokedec, "gst_smokedec_chain: sending buffer");
ret = gst_pad_push (smokedec->srcpad, outbuf);
done:
gst_buffer_unref (buf);
gst_object_unref (smokedec);
return ret;
/* ERRORS */
too_small:
{
GST_ELEMENT_ERROR (smokedec, STREAM, DECODE,
(NULL), ("Input buffer too small"));
ret = GST_FLOW_ERROR;
goto done;
}
header_error:
{
GST_ELEMENT_ERROR (smokedec, STREAM, DECODE,
(NULL), ("Could not parse smoke header, reason: %d", smokeret));
ret = GST_FLOW_ERROR;
goto done;
}
keyframe_skip:
{
GST_DEBUG_OBJECT (smokedec, "dropping buffer while waiting for keyframe");
ret = GST_FLOW_OK;
goto done;
}
decode_error:
{
GST_ELEMENT_ERROR (smokedec, STREAM, DECODE,
(NULL), ("Could not decode smoke frame, reason: %d", smokeret));
ret = GST_FLOW_ERROR;
goto done;
}
}
static GstStateChangeReturn
gst_smokedec_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret;
GstSmokeDec *dec;
dec = GST_SMOKEDEC (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
/* reset the initial video state */
dec->format = -1;
dec->width = -1;
dec->height = -1;
dec->fps_num = -1;
dec->fps_denom = -1;
dec->next_time = 0;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (ret != GST_STATE_CHANGE_SUCCESS)
return ret;
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
break;
default:
break;
}
return ret;
}