gstreamer/gst/mpegstream/gstrfc2250enc.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.
*/
/*#define GST_DEBUG_ENABLED*/
#include "gstrfc2250enc.h"
/* elementfactory information */
static GstElementDetails rfc2250_enc_details = {
"RFC 2250 packet encoder",
"Codec/Parser",
"transforms MPEG1/2 video to an RFC 2250 compliant format",
VERSION,
"Wim Taymans <wim.taymans@chello.be>",
"(C) 2001",
};
#define CLASS(o) GST_RFC2250_ENC_CLASS (G_OBJECT_GET_CLASS (o))
/* GstRFC2250Enc signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
ARG_BIT_RATE,
ARG_MPEG2,
/* FILL ME */
};
GST_PAD_TEMPLATE_FACTORY (sink_factory,
"sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_CAPS_NEW (
"rfc2250_enc_sink",
"video/mpeg",
"mpegversion", GST_PROPS_INT_RANGE (1, 2),
"systemstream", GST_PROPS_BOOLEAN (FALSE)
)
);
GST_PAD_TEMPLATE_FACTORY (src_factory,
"src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_CAPS_NEW (
"rfc2250_enc_src",
"video/mpeg",
"mpegversion", GST_PROPS_INT_RANGE (1, 2),
"systemstream", GST_PROPS_BOOLEAN (FALSE)
)
);
static void gst_rfc2250_enc_class_init (GstRFC2250EncClass *klass);
static void gst_rfc2250_enc_init (GstRFC2250Enc *rfc2250_enc);
static GstElementStateReturn
gst_rfc2250_enc_change_state (GstElement *element);
static void gst_rfc2250_enc_loop (GstElement *element);
static void gst_rfc2250_enc_get_property (GObject *object, guint prop_id,
GValue *value, GParamSpec *pspec);
static GstElementClass *parent_class = NULL;
/*static guint gst_rfc2250_enc_signals[LAST_SIGNAL] = { 0 };*/
GType
gst_rfc2250_enc_get_type (void)
{
static GType rfc2250_enc_type = 0;
if (!rfc2250_enc_type) {
static const GTypeInfo rfc2250_enc_info = {
sizeof(GstRFC2250EncClass), NULL,
NULL,
(GClassInitFunc)gst_rfc2250_enc_class_init,
NULL,
NULL,
sizeof(GstRFC2250Enc),
0,
(GInstanceInitFunc)gst_rfc2250_enc_init,
};
rfc2250_enc_type = g_type_register_static(GST_TYPE_ELEMENT, "GstRFC2250Enc", &rfc2250_enc_info, 0);
}
return rfc2250_enc_type;
}
static void
gst_rfc2250_enc_class_init (GstRFC2250EncClass *klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_BIT_RATE,
g_param_spec_uint("bit_rate","bit_rate","bit_rate",
0, G_MAXUINT, 0, G_PARAM_READABLE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_MPEG2,
g_param_spec_boolean ("mpeg2", "mpeg2", "is this an mpeg2 stream",
FALSE, G_PARAM_READABLE));
gobject_class->get_property = gst_rfc2250_enc_get_property;
gstelement_class->change_state = gst_rfc2250_enc_change_state;
}
static void
gst_rfc2250_enc_init (GstRFC2250Enc *rfc2250_enc)
{
rfc2250_enc->sinkpad = gst_pad_new_from_template(
GST_PAD_TEMPLATE_GET (sink_factory), "sink");
gst_element_add_pad(GST_ELEMENT(rfc2250_enc),rfc2250_enc->sinkpad);
gst_element_set_loop_function (GST_ELEMENT (rfc2250_enc), gst_rfc2250_enc_loop);
rfc2250_enc->srcpad = gst_pad_new_from_template(
GST_PAD_TEMPLATE_GET (src_factory), "src");
gst_element_add_pad(GST_ELEMENT(rfc2250_enc),rfc2250_enc->srcpad);
/* initialize parser state */
rfc2250_enc->packetize = NULL;
rfc2250_enc->next_ts = 0;
rfc2250_enc->packet = 0;
/* zero counters (should be done at RUNNING?) */
rfc2250_enc->bit_rate = 0;
rfc2250_enc->MTU = 3048;
GST_FLAG_SET (rfc2250_enc, GST_ELEMENT_EVENT_AWARE);
}
static void
gst_rfc2250_enc_new_buffer (GstRFC2250Enc *enc)
{
if (enc->packet) {
gst_pad_push (enc->srcpad, enc->packet);
}
enc->packet = gst_buffer_new ();
enc->flags = 0;
enc->remaining = enc->MTU;
}
static void
gst_rfc2250_enc_add_slice (GstRFC2250Enc *enc, GstBuffer *buffer)
{
gint slice_length = GST_BUFFER_SIZE (buffer);
/* see if the slice fits in the current buffer */
if (slice_length <= enc->remaining) {
gst_buffer_merge (enc->packet, buffer);
gst_buffer_unref (buffer);
enc->remaining -= slice_length;
}
/* it doesn't fit */
else {
/* do we need to start a new packet? */
if (slice_length <= enc->MTU) {
gst_rfc2250_enc_new_buffer (enc);
gst_buffer_merge (enc->packet, buffer);
gst_buffer_unref (buffer);
enc->remaining -= slice_length;
}
/* else we have to fragment */
else {
gint offset = 0;
while (slice_length > 0) {
GstBuffer *outbuf;
outbuf = gst_buffer_create_sub (buffer, offset, MIN (enc->remaining, slice_length));
gst_buffer_merge (enc->packet, outbuf);
slice_length -= GST_BUFFER_SIZE (outbuf);
offset += GST_BUFFER_SIZE (outbuf);
gst_buffer_unref (outbuf);
gst_rfc2250_enc_new_buffer (enc);
}
gst_buffer_unref (buffer);
}
}
}
static void
gst_rfc2250_enc_loop (GstElement *element)
{
GstRFC2250Enc *enc = GST_RFC2250_ENC (element);
GstData *data;
guint id;
gboolean mpeg2;
data = gst_mpeg_packetize_read (enc->packetize);
id = GST_MPEG_PACKETIZE_ID (enc->packetize);
mpeg2 = GST_MPEG_PACKETIZE_IS_MPEG2 (enc->packetize);
if (GST_IS_BUFFER (data)) {
GstBuffer *buffer = GST_BUFFER (data);
GST_DEBUG (0, "rfc2250enc: have chunk 0x%02X", id);
switch (id) {
case SEQUENCE_START_CODE:
gst_rfc2250_enc_new_buffer (enc);
enc->flags |= ENC_HAVE_SEQ;
break;
case GOP_START_CODE:
if (enc->flags & ENC_HAVE_DATA) {
gst_rfc2250_enc_new_buffer (enc);
}
enc->flags |= ENC_HAVE_GOP;
break;
case PICTURE_START_CODE:
if (enc->flags & ENC_HAVE_DATA) {
gst_rfc2250_enc_new_buffer (enc);
}
enc->flags |= ENC_HAVE_PIC;
break;
case EXT_START_CODE:
break;
case SLICE_MIN_START_CODE ... SLICE_MAX_START_CODE:
enc->flags |= ENC_HAVE_DATA;
gst_rfc2250_enc_add_slice (enc, buffer);
buffer = NULL;
break;
case USER_START_CODE:
case SEQUENCE_ERROR_START_CODE:
case SEQUENCE_END_START_CODE:
break;
default:
break;
}
if (buffer) {
gst_buffer_merge (enc->packet, buffer);
enc->remaining -= GST_BUFFER_SIZE (buffer);
gst_buffer_unref (buffer);
}
}
else {
if (enc->packet) {
gst_pad_push (enc->srcpad, enc->packet);
enc->packet = NULL;
enc->flags = 0;
enc->remaining = enc->MTU;
}
gst_pad_event_default (enc->sinkpad, GST_EVENT (data));
}
}
static GstElementStateReturn
gst_rfc2250_enc_change_state (GstElement *element)
{
GstRFC2250Enc *rfc2250_enc = GST_RFC2250_ENC (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_NULL_TO_READY:
if (!rfc2250_enc->packetize) {
rfc2250_enc->packetize = gst_mpeg_packetize_new (rfc2250_enc->sinkpad, GST_MPEG_PACKETIZE_VIDEO);
}
break;
case GST_STATE_READY_TO_NULL:
if (rfc2250_enc->packetize) {
gst_mpeg_packetize_destroy (rfc2250_enc->packetize);
rfc2250_enc->packetize = NULL;
}
break;
default:
break;
}
GST_ELEMENT_CLASS (parent_class)->change_state (element);
return GST_STATE_SUCCESS;
}
static void
gst_rfc2250_enc_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
GstRFC2250Enc *rfc2250_enc;
/* it's not null if we got it, but it might not be ours */
rfc2250_enc = GST_RFC2250_ENC(object);
switch (prop_id) {
case ARG_BIT_RATE:
g_value_set_uint (value, rfc2250_enc->bit_rate);
break;
case ARG_MPEG2:
if (rfc2250_enc->packetize)
g_value_set_boolean (value, GST_MPEG_PACKETIZE_IS_MPEG2 (rfc2250_enc->packetize));
else
g_value_set_boolean (value, FALSE);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
gboolean
gst_rfc2250_enc_plugin_init (GModule *module, GstPlugin *plugin)
{
GstElementFactory *factory;
/* this filter needs the bytestream package */
if (!gst_library_load("gstbytestream"))
return FALSE;
/* create an elementfactory for the rfc2250_enc element */
factory = gst_element_factory_new ("rfc2250enc", GST_TYPE_RFC2250_ENC,
&rfc2250_enc_details);
g_return_val_if_fail(factory != NULL, FALSE);
gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (src_factory));
gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (sink_factory));
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
return TRUE;
}