gstreamer/gst/law/mulaw-decode.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 <gst/gst.h>
#include "mulaw-decode.h"
#include "mulaw-conversion.h"
extern GstPadTemplate *mulawdec_src_template, *mulawdec_sink_template;
/* Stereo signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0
};
static void gst_mulawdec_class_init (GstMuLawDecClass * klass);
static void gst_mulawdec_base_init (GstMuLawDecClass * klass);
static void gst_mulawdec_init (GstMuLawDec * mulawdec);
static void gst_mulawdec_chain (GstPad * pad, GstData * _data);
static GstElementClass *parent_class = NULL;
/*static guint gst_stereo_signals[LAST_SIGNAL] = { 0 };*/
static GstCaps *
mulawdec_getcaps (GstPad * pad)
{
GstMuLawDec *mulawdec = GST_MULAWDEC (gst_pad_get_parent (pad));
GstPad *otherpad;
GstCaps *base_caps, *othercaps;
GstStructure *structure;
const GValue *rate, *chans;
if (pad == mulawdec->sinkpad) {
otherpad = mulawdec->srcpad;
base_caps = gst_caps_new_simple ("audio/x-mulaw", NULL);
} else {
otherpad = mulawdec->sinkpad;
base_caps = gst_caps_new_simple ("audio/x-raw-int",
"width", G_TYPE_INT, 16, "depth", G_TYPE_INT, 16,
"endianness", G_TYPE_INT, G_BYTE_ORDER, NULL);
}
othercaps = gst_pad_get_allowed_caps (otherpad);
/* Not fully correct, but usually, all structures in a caps have
* the same samplerate and channels range. */
structure = gst_caps_get_structure (othercaps, 0);
rate = gst_structure_get_value (structure, "rate");
chans = gst_structure_get_value (structure, "channels");
if (!rate || !chans)
return gst_caps_new_empty ();
/* Set the samplerate/channels on the to-be-returned caps */
structure = gst_caps_get_structure (base_caps, 0);
gst_structure_set_value (structure, "rate", rate);
gst_structure_set_value (structure, "channels", chans);
gst_caps_free (othercaps);
return base_caps;
}
static GstPadLinkReturn
mulawdec_link (GstPad * pad, const GstCaps * caps)
{
GstMuLawDec *mulawdec = GST_MULAWDEC (gst_pad_get_parent (pad));
GstPad *otherpad;
GstStructure *structure;
const GValue *rate, *chans;
GstCaps *base_caps;
structure = gst_caps_get_structure (caps, 0);
rate = gst_structure_get_value (structure, "rate");
chans = gst_structure_get_value (structure, "channels");
if (!rate || !chans)
return GST_PAD_LINK_REFUSED;
if (pad == mulawdec->srcpad) {
otherpad = mulawdec->sinkpad;
base_caps = gst_caps_new_simple ("audio/x-mulaw", NULL);
} else {
otherpad = mulawdec->srcpad;
base_caps = gst_caps_new_simple ("audio/x-raw-int",
"width", G_TYPE_INT, 16, "depth", G_TYPE_INT, 16,
"endianness", G_TYPE_INT, G_BYTE_ORDER, NULL);
}
structure = gst_caps_get_structure (base_caps, 0);
gst_structure_set_value (structure, "rate", rate);
gst_structure_set_value (structure, "channels", chans);
return gst_pad_try_set_caps (otherpad, base_caps);
}
GType
gst_mulawdec_get_type (void)
{
static GType mulawdec_type = 0;
if (!mulawdec_type) {
static const GTypeInfo mulawdec_info = {
sizeof (GstMuLawDecClass),
(GBaseInitFunc) gst_mulawdec_base_init,
NULL,
(GClassInitFunc) gst_mulawdec_class_init,
NULL,
NULL,
sizeof (GstMuLawDec),
0,
(GInstanceInitFunc) gst_mulawdec_init,
};
mulawdec_type =
g_type_register_static (GST_TYPE_ELEMENT, "GstMuLawDec", &mulawdec_info,
0);
}
return mulawdec_type;
}
static void
gst_mulawdec_base_init (GstMuLawDecClass * klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstElementDetails mulawdec_details = {
"Mu Law to PCM conversion",
"Codec/Decoder/Audio",
"Convert 8bit mu law to 16bit PCM",
"Zaheer Merali <zaheer@bellworldwide.net>"
};
gst_element_class_add_pad_template (element_class, mulawdec_src_template);
gst_element_class_add_pad_template (element_class, mulawdec_sink_template);
gst_element_class_set_details (element_class, &mulawdec_details);
}
static void
gst_mulawdec_class_init (GstMuLawDecClass * klass)
{
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
}
static void
gst_mulawdec_init (GstMuLawDec * mulawdec)
{
mulawdec->sinkpad =
gst_pad_new_from_template (mulawdec_sink_template, "sink");
gst_pad_set_link_function (mulawdec->sinkpad, mulawdec_link);
gst_pad_set_getcaps_function (mulawdec->sinkpad, mulawdec_getcaps);
gst_pad_set_chain_function (mulawdec->sinkpad, gst_mulawdec_chain);
gst_element_add_pad (GST_ELEMENT (mulawdec), mulawdec->sinkpad);
mulawdec->srcpad = gst_pad_new_from_template (mulawdec_src_template, "src");
gst_pad_set_link_function (mulawdec->srcpad, mulawdec_link);
gst_pad_set_getcaps_function (mulawdec->srcpad, mulawdec_getcaps);
gst_element_add_pad (GST_ELEMENT (mulawdec), mulawdec->srcpad);
}
static void
gst_mulawdec_chain (GstPad * pad, GstData * _data)
{
GstBuffer *buf = GST_BUFFER (_data);
GstMuLawDec *mulawdec;
gint16 *linear_data;
guint8 *mulaw_data;
GstBuffer *outbuf;
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (buf != NULL);
mulawdec = GST_MULAWDEC (GST_OBJECT_PARENT (pad));
g_return_if_fail (mulawdec != NULL);
g_return_if_fail (GST_IS_MULAWDEC (mulawdec));
mulaw_data = (guint8 *) GST_BUFFER_DATA (buf);
outbuf = gst_buffer_new_and_alloc (GST_BUFFER_SIZE (buf) * 2);
GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buf);
GST_BUFFER_DURATION (outbuf) = GST_BUFFER_DURATION (buf);
linear_data = (gint16 *) GST_BUFFER_DATA (outbuf);
mulaw_decode (mulaw_data, linear_data, GST_BUFFER_SIZE (buf));
gst_buffer_unref (buf);
gst_pad_push (mulawdec->srcpad, GST_DATA (outbuf));
}