gstreamer/ext/mimic/gstmimenc.c

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/*
* GStreamer
* Copyright (c) 2005 INdT.
* @author Andre Moreira Magalhaes <andre.magalhaes@indt.org.br>
* @author Philippe Khalaf <burger@speedy.org>
*
* 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-mimenc
* @see_also: mimdec
*
* The MIMIC codec is used by MSN Messenger's webcam support. It creates the
* TCP header for the MIMIC codec.
*
* Its fourcc is ML20.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include "gstmimenc.h"
GST_DEBUG_CATEGORY (mimenc_debug);
#define GST_CAT_DEFAULT (mimenc_debug)
#define MAX_INTERFRAMES 15
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static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("video/x-raw-rgb, "
"bpp = (int) 24, "
"depth = (int) 24, "
"endianness = (int) 4321, "
"framerate = (fraction) [1/1, 30/1], "
"red_mask = (int) 16711680, "
"green_mask = (int) 65280, "
"blue_mask = (int) 255, "
"width = (int) 320, "
"height = (int) 240"
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";video/x-raw-rgb, "
"bpp = (int) 24, "
"depth = (int) 24, "
"endianness = (int) 4321, "
"framerate = (fraction) [1/1, 30/1], "
"red_mask = (int) 16711680, "
"green_mask = (int) 65280, "
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"blue_mask = (int) 255, " "width = (int) 160, " "height = (int) 120")
);
static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-mimic")
);
static gboolean gst_mimenc_setcaps (GstPad * pad, GstCaps * caps);
static GstFlowReturn gst_mimenc_chain (GstPad * pad, GstBuffer * in);
static GstBuffer *gst_mimenc_create_tcp_header (GstMimEnc * mimenc,
guint32 payload_size, guint32 timestamp);
static GstStateChangeReturn
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gst_mimenc_change_state (GstElement * element, GstStateChange transition);
GST_BOILERPLATE (GstMimEnc, gst_mimenc, GstElement, GST_TYPE_ELEMENT);
static void
gst_mimenc_base_init (gpointer klass)
{
static GstElementDetails plugin_details = {
"MimEnc",
"Codec/Encoder/Video",
"Mimic encoder",
"Andre Moreira Magalhaes <andre.magalhaes@indt.org.br>"
};
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&src_factory));
gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&sink_factory));
gst_element_class_set_details (element_class, &plugin_details);
}
static void
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gst_mimenc_class_init (GstMimEncClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
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gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstelement_class->change_state = gst_mimenc_change_state;
GST_DEBUG_CATEGORY_INIT (mimenc_debug, "mimenc", 0, "Mimic encoder plugin");
}
static void
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gst_mimenc_init (GstMimEnc * mimenc, GstMimEncClass * klass)
{
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mimenc->sinkpad =
gst_pad_new_from_template (gst_static_pad_template_get (&sink_factory),
"sink");
gst_element_add_pad (GST_ELEMENT (mimenc), mimenc->sinkpad);
gst_pad_set_setcaps_function (mimenc->sinkpad, gst_mimenc_setcaps);
gst_pad_set_chain_function (mimenc->sinkpad, gst_mimenc_chain);
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mimenc->srcpad =
gst_pad_new_from_template (gst_static_pad_template_get (&src_factory),
"src");
gst_element_add_pad (GST_ELEMENT (mimenc), mimenc->srcpad);
mimenc->enc = NULL;
// TODO property to set resolution
mimenc->res = MIMIC_RES_HIGH;
mimenc->buffer_size = -1;
mimenc->width = 0;
mimenc->height = 0;
mimenc->frames = 0;
}
static gboolean
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gst_mimenc_setcaps (GstPad * pad, GstCaps * caps)
{
GstMimEnc *filter;
GstStructure *structure;
int ret = TRUE, height, width;
filter = GST_MIMENC (gst_pad_get_parent (pad));
g_return_val_if_fail (filter != NULL, FALSE);
g_return_val_if_fail (GST_IS_MIMENC (filter), FALSE);
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structure = gst_caps_get_structure (caps, 0);
ret = gst_structure_get_int (structure, "width", &width);
if (!ret) {
GST_DEBUG_OBJECT (filter, "No width set");
goto out;
}
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ret = gst_structure_get_int (structure, "height", &height);
if (!ret) {
GST_DEBUG_OBJECT (filter, "No height set");
goto out;
}
GST_OBJECT_LOCK (filter);
if (width == 320 && height == 240)
filter->res = MIMIC_RES_HIGH;
else if (width == 160 && height == 120)
filter->res = MIMIC_RES_LOW;
else {
GST_WARNING_OBJECT (filter, "Invalid resolution %dx%d", width, height);
ret = FALSE;
GST_OBJECT_UNLOCK (filter);
goto out;
}
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filter->width = (guint16) width;
filter->height = (guint16) height;
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GST_DEBUG_OBJECT (filter, "Got info from caps w : %d, h : %d",
filter->width, filter->height);
GST_OBJECT_UNLOCK (filter);
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out:
gst_object_unref (filter);
return ret;
}
static GstFlowReturn
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gst_mimenc_chain (GstPad * pad, GstBuffer * in)
{
GstMimEnc *mimenc;
GstBuffer *out_buf = NULL, *buf = NULL;
guchar *data;
gint buffer_size;
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GstBuffer *header = NULL;
GstFlowReturn res = GST_FLOW_OK;
g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
mimenc = GST_MIMENC (gst_pad_get_parent (pad));
g_return_val_if_fail (GST_IS_MIMENC (mimenc), GST_FLOW_ERROR);
GST_OBJECT_LOCK (mimenc);
if (mimenc->enc == NULL) {
mimenc->enc = mimic_open ();
if (mimenc->enc == NULL) {
GST_WARNING_OBJECT (mimenc, "mimic_open error\n");
res = GST_FLOW_ERROR;
goto out_unlock;
}
if (!mimic_encoder_init (mimenc->enc, mimenc->res)) {
GST_WARNING_OBJECT (mimenc, "mimic_encoder_init error\n");
mimic_close (mimenc->enc);
mimenc->enc = NULL;
res = GST_FLOW_ERROR;
goto out_unlock;
}
if (!mimic_get_property (mimenc->enc, "buffer_size", &mimenc->buffer_size)) {
GST_WARNING_OBJECT (mimenc, "mimic_get_property('buffer_size') error\n");
mimic_close (mimenc->enc);
mimenc->enc = NULL;
res = GST_FLOW_ERROR;
goto out_unlock;
}
}
buf = in;
data = GST_BUFFER_DATA (buf);
out_buf = gst_buffer_new_and_alloc (mimenc->buffer_size);
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GST_BUFFER_TIMESTAMP (out_buf) = GST_BUFFER_TIMESTAMP (buf);
buffer_size = mimenc->buffer_size;
if (!mimic_encode_frame (mimenc->enc, data, GST_BUFFER_DATA (out_buf),
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&buffer_size,
((mimenc->frames % MAX_INTERFRAMES) == 0 ? TRUE : FALSE))) {
GST_WARNING_OBJECT (mimenc, "mimic_encode_frame error\n");
gst_buffer_unref (out_buf);
gst_buffer_unref (buf);
res = GST_FLOW_ERROR;
goto out_unlock;
}
GST_BUFFER_SIZE (out_buf) = buffer_size;
GST_DEBUG_OBJECT (mimenc, "incoming buf size %d, encoded size %d",
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GST_BUFFER_SIZE (buf), GST_BUFFER_SIZE (out_buf));
++mimenc->frames;
// now let's create that tcp header
header = gst_mimenc_create_tcp_header (mimenc, buffer_size,
GST_BUFFER_TIMESTAMP (buf) / GST_MSECOND);
GST_OBJECT_UNLOCK (mimenc);
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if (header) {
res = gst_pad_push (mimenc->srcpad, header);
if (res != GST_FLOW_OK) {
gst_buffer_unref (out_buf);
goto out;
}
res = gst_pad_push (mimenc->srcpad, out_buf);
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} else {
GST_DEBUG_OBJECT (mimenc, "header not created succesfully");
res = GST_FLOW_ERROR;
}
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out:
if (buf)
gst_buffer_unref (buf);
gst_object_unref (mimenc);
return res;
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out_unlock:
GST_OBJECT_UNLOCK (mimenc);
goto out;
}
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static GstBuffer *
gst_mimenc_create_tcp_header (GstMimEnc * mimenc, guint32 payload_size,
guint32 timestamp)
{
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// 24 bytes
GstBuffer *buf_header = gst_buffer_new_and_alloc (24);
guchar *p = (guchar *) GST_BUFFER_DATA (buf_header);
p[0] = 24;
*((guchar *) (p + 1)) = 0;
*((guint16 *) (p + 2)) = GUINT16_TO_LE (mimenc->width);
*((guint16 *) (p + 4)) = GUINT16_TO_LE (mimenc->height);
*((guint16 *) (p + 6)) = 0;
*((guint32 *) (p + 8)) = GUINT32_TO_LE (payload_size);
*((guint32 *) (p + 12)) =
GUINT32_TO_LE (GST_MAKE_FOURCC ('M', 'L', '2', '0'));
*((guint32 *) (p + 16)) = 0;
*((guint32 *) (p + 20)) = timestamp;
return buf_header;
}
static GstStateChangeReturn
gst_mimenc_change_state (GstElement * element, GstStateChange transition)
{
GstMimEnc *mimenc;
switch (transition) {
case GST_STATE_CHANGE_READY_TO_NULL:
mimenc = GST_MIMENC (element);
GST_OBJECT_LOCK (element);
if (mimenc->enc != NULL) {
mimic_close (mimenc->enc);
mimenc->enc = NULL;
mimenc->buffer_size = -1;
mimenc->frames = 0;
}
GST_OBJECT_UNLOCK (element);
break;
default:
break;
}
return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
}