gstreamer/gst/law/mulaw-encode.c
Wim Taymans 781bc3309b gst/law/: Ported alaw and mulaw plugins to 0.9, fixed the negotiation as well.
Original commit message from CVS:
* gst/law/alaw-decode.c: (alawdec_getcaps), (alawdec_setcaps),
(gst_alawdec_init), (gst_alawdec_chain):
* gst/law/alaw-encode.c: (alawenc_getcaps), (alawenc_setcaps),
(gst_alawenc_init), (gst_alawenc_chain):
* gst/law/mulaw-decode.c: (mulawdec_getcaps), (mulawdec_setcaps),
(gst_mulawdec_init), (gst_mulawdec_chain):
* gst/law/mulaw-encode.c: (mulawenc_getcaps), (mulawenc_setcaps),
(gst_mulawenc_init), (gst_mulawenc_chain):
Ported alaw and mulaw plugins to 0.9, fixed the negotiation as
well.
2005-05-06 14:08:56 +00:00

220 lines
6.3 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 GstFlowReturn gst_mulawenc_chain (GstPad * pad, GstBuffer * buffer);
static GstElementClass *parent_class = NULL;
/*static guint gst_stereo_signals[LAST_SIGNAL] = { 0 }; */
static GstCaps *
mulawenc_getcaps (GstPad * pad)
{
GstMuLawEnc *mulawenc;
GstPad *otherpad;
GstCaps *base_caps, *othercaps;
mulawenc = GST_MULAWENC (GST_PAD_PARENT (pad));
base_caps = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
if (pad == mulawenc->srcpad) {
otherpad = mulawenc->sinkpad;
} else {
otherpad = mulawenc->srcpad;
}
othercaps = gst_pad_peer_get_caps (otherpad);
if (othercaps) {
GstStructure *structure;
const GValue *orate, *ochans;
const GValue *rate, *chans;
GValue irate = { 0 }, ichans = {
0};
structure = gst_caps_get_structure (othercaps, 0);
orate = gst_structure_get_value (structure, "rate");
ochans = gst_structure_get_value (structure, "channels");
if (!rate || !chans)
goto done;
structure = gst_caps_get_structure (base_caps, 0);
rate = gst_structure_get_value (structure, "rate");
chans = gst_structure_get_value (structure, "channels");
if (!rate || !chans)
goto done;
gst_value_intersect (&irate, orate, rate);
gst_value_intersect (&ichans, ochans, chans);
/* Set the samplerate/channels on the to-be-returned caps */
structure = gst_caps_get_structure (base_caps, 0);
gst_structure_set_value (structure, "rate", &irate);
gst_structure_set_value (structure, "channels", &ichans);
gst_caps_unref (othercaps);
}
done:
return base_caps;
}
static gboolean
mulawenc_setcaps (GstPad * pad, GstCaps * caps)
{
GstMuLawEnc *mulawenc;
GstPad *otherpad;
GstStructure *structure;
const GValue *rate, *chans;
GstCaps *base_caps;
mulawenc = GST_MULAWENC (gst_pad_get_parent (pad));
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 FALSE;
if (pad == mulawenc->sinkpad) {
otherpad = mulawenc->srcpad;
} else {
otherpad = mulawenc->sinkpad;
}
base_caps = gst_caps_copy (gst_pad_get_pad_template_caps (otherpad));
structure = gst_caps_get_structure (base_caps, 0);
gst_structure_set_value (structure, "rate", rate);
gst_structure_set_value (structure, "channels", chans);
gst_pad_set_caps (otherpad, base_caps);
gst_caps_unref (base_caps);
return TRUE;
}
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_setcaps_function (mulawenc->sinkpad, mulawenc_setcaps);
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_setcaps_function (mulawenc->srcpad, mulawenc_setcaps);
gst_pad_set_getcaps_function (mulawenc->srcpad, mulawenc_getcaps);
gst_element_add_pad (GST_ELEMENT (mulawenc), mulawenc->srcpad);
}
static GstFlowReturn
gst_mulawenc_chain (GstPad * pad, GstBuffer * buffer)
{
GstMuLawEnc *mulawenc;
gint16 *linear_data;
guint8 *mulaw_data;
GstBuffer *outbuf;
mulawenc = GST_MULAWENC (GST_OBJECT_PARENT (pad));
linear_data = (gint16 *) GST_BUFFER_DATA (buffer);
outbuf = gst_buffer_new_and_alloc (GST_BUFFER_SIZE (buffer) / 2);
GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buffer);
GST_BUFFER_DURATION (outbuf) = GST_BUFFER_DURATION (buffer);
gst_buffer_set_caps (outbuf, GST_PAD_CAPS (mulawenc->srcpad));
mulaw_data = (gint8 *) GST_BUFFER_DATA (outbuf);
mulaw_encode (linear_data, mulaw_data, GST_BUFFER_SIZE (outbuf));
gst_buffer_unref (buffer);
return gst_pad_push (mulawenc->srcpad, outbuf);
}