gstreamer/ext/gsm/gstgsmenc.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.
*/
#include <string.h>
#include "gstgsmenc.h"
extern GstPadTemplate *gsmenc_src_template, *gsmenc_sink_template;
/* elementfactory information */
GstElementDetails gst_gsmenc_details = {
"gsm audio encoder",
"Codec/Audio/Encoder",
"LGPL",
".gsm",
VERSION,
"Wim Taymans <wim.taymans@chello.be>",
"(C) 2000",
};
/* GSMEnc signals and args */
enum {
FRAME_ENCODED,
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
/* FILL ME */
};
static void gst_gsmenc_class_init (GstGSMEnc *klass);
static void gst_gsmenc_init (GstGSMEnc *gsmenc);
static void gst_gsmenc_chain (GstPad *pad,GstBuffer *buf);
static GstPadConnectReturn gst_gsmenc_sinkconnect (GstPad *pad, GstCaps *caps);
static GstElementClass *parent_class = NULL;
static guint gst_gsmenc_signals[LAST_SIGNAL] = { 0 };
GType
gst_gsmenc_get_type (void)
{
static GType gsmenc_type = 0;
if (!gsmenc_type) {
static const GTypeInfo gsmenc_info = {
sizeof (GstGSMEncClass),
NULL,
NULL,
(GClassInitFunc) gst_gsmenc_class_init,
NULL,
NULL,
sizeof (GstGSMEnc),
0,
(GInstanceInitFunc) gst_gsmenc_init,
};
gsmenc_type = g_type_register_static (GST_TYPE_ELEMENT, "GstGSMEnc", &gsmenc_info, 0);
}
return gsmenc_type;
}
static void
gst_gsmenc_class_init (GstGSMEnc *klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass*) klass;
gstelement_class = (GstElementClass*) klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
gst_gsmenc_signals[FRAME_ENCODED] =
g_signal_new ("frame_encoded", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstGSMEncClass, frame_encoded), NULL, NULL,
g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
}
static void
gst_gsmenc_init (GstGSMEnc *gsmenc)
{
/* create the sink and src pads */
gsmenc->sinkpad = gst_pad_new_from_template (gsmenc_sink_template, "sink");
gst_element_add_pad (GST_ELEMENT (gsmenc), gsmenc->sinkpad);
gst_pad_set_chain_function (gsmenc->sinkpad, gst_gsmenc_chain);
gst_pad_set_connect_function (gsmenc->sinkpad, gst_gsmenc_sinkconnect);
gsmenc->srcpad = gst_pad_new_from_template (gsmenc_src_template, "src");
gst_element_add_pad (GST_ELEMENT (gsmenc), gsmenc->srcpad);
gsmenc->state = gsm_create ();
gsmenc->bufsize = 0;
gsmenc->next_ts = 0;
gsmenc->rate = 8000;
}
static GstPadConnectReturn
gst_gsmenc_sinkconnect (GstPad *pad, GstCaps *caps)
{
GstGSMEnc *gsmenc;
gsmenc = GST_GSMENC (gst_pad_get_parent (pad));
if (!GST_CAPS_IS_FIXED (caps))
return GST_PAD_CONNECT_DELAYED;
gst_caps_get_int (caps, "rate", &gsmenc->rate);
if (gst_pad_try_set_caps (gsmenc->srcpad, GST_CAPS_NEW (
"gsm_gsm",
"audio/x-gsm",
"rate", GST_PROPS_INT (gsmenc->rate)
)) > 0)
{
return GST_PAD_CONNECT_OK;
}
return GST_PAD_CONNECT_REFUSED;
}
static void
gst_gsmenc_chain (GstPad *pad, GstBuffer *buf)
{
GstGSMEnc *gsmenc;
gsm_signal *data;
guint size;
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (buf != NULL);
gsmenc = GST_GSMENC (GST_OBJECT_PARENT (pad));
if (!GST_PAD_CAPS (gsmenc->srcpad)) {
gst_pad_try_set_caps (gsmenc->srcpad,
GST_CAPS_NEW (
"gsm_enc",
"audio/x-gsm",
"rate", GST_PROPS_INT (gsmenc->rate)
));
}
data = (gsm_signal*) GST_BUFFER_DATA (buf);
size = GST_BUFFER_SIZE (buf) / sizeof (gsm_signal);
if (gsmenc->bufsize && (gsmenc->bufsize + size >= 160)) {
GstBuffer *outbuf;
memcpy (gsmenc->buffer + gsmenc->bufsize, data, (160 - gsmenc->bufsize) * sizeof (gsm_signal));
outbuf = gst_buffer_new ();
GST_BUFFER_DATA (outbuf) = g_malloc (33 * sizeof (gsm_byte));
GST_BUFFER_SIZE (outbuf) = 33 * sizeof (gsm_byte);
gsm_encode (gsmenc->state, gsmenc->buffer, (gsm_byte *) GST_BUFFER_DATA (outbuf));
GST_BUFFER_TIMESTAMP (outbuf) = gsmenc->next_ts;
gst_pad_push (gsmenc->srcpad, outbuf);
gsmenc->next_ts += (160.0 / gsmenc->rate) * 1000000;
size -= (160 - gsmenc->bufsize);
data += (160 - gsmenc->bufsize);
gsmenc->bufsize = 0;
}
while (size >= 160) {
GstBuffer *outbuf;
outbuf = gst_buffer_new ();
GST_BUFFER_DATA (outbuf) = g_malloc (33 * sizeof (gsm_byte));
GST_BUFFER_SIZE (outbuf) = 33 * sizeof (gsm_byte);
gsm_encode (gsmenc->state, data, (gsm_byte *) GST_BUFFER_DATA (outbuf));
GST_BUFFER_TIMESTAMP (outbuf) = gsmenc->next_ts;
gst_pad_push (gsmenc->srcpad, outbuf);
gsmenc->next_ts += (160 / gsmenc->rate) * GST_SECOND;
size -= 160;
data += 160;
}
if (size) {
memcpy (gsmenc->buffer + gsmenc->bufsize, data, size * sizeof (gsm_signal));
gsmenc->bufsize += size;
}
gst_buffer_unref(buf);
}