gstreamer/gst/law/mulaw-encode.c
Stéphane Loeuillet e822442495 put the same mail for Zaheer Merali everywhere
Original commit message from CVS:
put the same mail for Zaheer Merali everywhere
2004-12-11 13:43:19 +00:00

211 lines
6.5 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include "mulaw-encode.h"
#include "mulaw-conversion.h"
extern GstPadTemplate *mulawenc_src_template, *mulawenc_sink_template;
/* Stereo signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0
};
static void gst_mulawenc_class_init (GstMuLawEncClass * klass);
static void gst_mulawenc_base_init (GstMuLawEncClass * klass);
static void gst_mulawenc_init (GstMuLawEnc * mulawenc);
static void gst_mulawenc_chain (GstPad * pad, GstData * _data);
static GstElementClass *parent_class = NULL;
/*static guint gst_stereo_signals[LAST_SIGNAL] = { 0 }; */
static GstCaps *
mulawenc_getcaps (GstPad * pad)
{
GstMuLawEnc *mulawenc = GST_MULAWENC (gst_pad_get_parent (pad));
GstPad *otherpad;
GstCaps *base_caps, *othercaps;
GstStructure *structure;
const GValue *rate, *chans;
if (pad == mulawenc->srcpad) {
otherpad = mulawenc->sinkpad;
base_caps = gst_caps_new_simple ("audio/x-mulaw", NULL);
} else {
otherpad = mulawenc->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,
"signed", G_TYPE_BOOLEAN, TRUE, 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
mulawenc_link (GstPad * pad, const GstCaps * caps)
{
GstMuLawEnc *mulawenc = GST_MULAWENC (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 == mulawenc->sinkpad) {
otherpad = mulawenc->srcpad;
base_caps = gst_caps_new_simple ("audio/x-mulaw", NULL);
} else {
otherpad = mulawenc->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,
"signed", G_TYPE_BOOLEAN, TRUE, 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_mulawenc_get_type (void)
{
static GType mulawenc_type = 0;
if (!mulawenc_type) {
static const GTypeInfo mulawenc_info = {
sizeof (GstMuLawEncClass),
(GBaseInitFunc) gst_mulawenc_base_init,
NULL,
(GClassInitFunc) gst_mulawenc_class_init,
NULL,
NULL,
sizeof (GstMuLawEnc),
0,
(GInstanceInitFunc) gst_mulawenc_init,
};
mulawenc_type =
g_type_register_static (GST_TYPE_ELEMENT, "GstMuLawEnc", &mulawenc_info,
0);
}
return mulawenc_type;
}
static void
gst_mulawenc_base_init (GstMuLawEncClass * klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstElementDetails mulawenc_details = {
"PCM to Mu Law conversion",
"Codec/Encoder/Audio",
"Convert 16bit PCM to 8bit mu law",
"Zaheer Abbas Merali <zaheerabbas at merali dot org>"
};
gst_element_class_add_pad_template (element_class, mulawenc_src_template);
gst_element_class_add_pad_template (element_class, mulawenc_sink_template);
gst_element_class_set_details (element_class, &mulawenc_details);
}
static void
gst_mulawenc_class_init (GstMuLawEncClass * klass)
{
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
}
static void
gst_mulawenc_init (GstMuLawEnc * mulawenc)
{
mulawenc->sinkpad =
gst_pad_new_from_template (mulawenc_sink_template, "sink");
gst_pad_set_link_function (mulawenc->sinkpad, mulawenc_link);
gst_pad_set_getcaps_function (mulawenc->sinkpad, mulawenc_getcaps);
gst_pad_set_chain_function (mulawenc->sinkpad, gst_mulawenc_chain);
gst_element_add_pad (GST_ELEMENT (mulawenc), mulawenc->sinkpad);
mulawenc->srcpad = gst_pad_new_from_template (mulawenc_src_template, "src");
gst_pad_set_link_function (mulawenc->srcpad, mulawenc_link);
gst_pad_set_getcaps_function (mulawenc->srcpad, mulawenc_getcaps);
gst_element_add_pad (GST_ELEMENT (mulawenc), mulawenc->srcpad);
}
static void
gst_mulawenc_chain (GstPad * pad, GstData * _data)
{
GstBuffer *buf = GST_BUFFER (_data);
GstMuLawEnc *mulawenc;
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);
mulawenc = GST_MULAWENC (GST_OBJECT_PARENT (pad));
g_return_if_fail (mulawenc != NULL);
g_return_if_fail (GST_IS_MULAWENC (mulawenc));
linear_data = (gint16 *) 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);
mulaw_data = (gint8 *) GST_BUFFER_DATA (outbuf);
mulaw_encode (linear_data, mulaw_data, GST_BUFFER_SIZE (outbuf));
gst_buffer_unref (buf);
gst_pad_push (mulawenc->srcpad, GST_DATA (outbuf));
}