diff options
Diffstat (limited to 'gst/law/alaw-decode.c')
| -rw-r--r-- | gst/law/alaw-decode.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/gst/law/alaw-decode.c b/gst/law/alaw-decode.c new file mode 100644 index 00000000..872d5335 --- /dev/null +++ b/gst/law/alaw-decode.c @@ -0,0 +1,186 @@ +/* Gnome-Streamer + * 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 <gst/gst.h> +#include "alaw-decode.h" +#include "mulaw-conversion.h" +#include "alaw-conversion.h" + +extern GstPadTemplate *alawdec_src_template, *alawdec_sink_template; + + +/* Stereo signals and args */ +enum { + /* FILL ME */ + LAST_SIGNAL +}; + +enum { + ARG_0 +}; + +static void gst_alawdec_class_init (GstALawDecClass *klass); +static void gst_alawdec_init (GstALawDec *alawdec); + +static void gst_alawdec_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec); +static void gst_alawdec_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec); + +static void gst_alawdec_chain (GstPad *pad, GstBuffer *buf); + + +static GstElementClass *parent_class = NULL; +//static guint gst_stereo_signals[LAST_SIGNAL] = { 0 }; + +static GstPadNegotiateReturn +alawdec_negotiate_sink (GstPad *pad, GstCaps **caps, gint counter) +{ + GstCaps* tempcaps; + + GstALawDec* alawdec=GST_ALAWDEC (GST_OBJECT_PARENT (pad)); + + if (*caps==NULL) + return GST_PAD_NEGOTIATE_FAIL; + + tempcaps = gst_caps_copy(*caps); + + gst_caps_set(tempcaps,"format",GST_PROPS_STRING("int")); + gst_caps_set(tempcaps,"law",GST_PROPS_INT(0)); + gst_caps_set(tempcaps,"depth",GST_PROPS_INT(16)); + gst_caps_set(tempcaps,"width",GST_PROPS_INT(16)); + gst_caps_set(tempcaps,"signed",GST_PROPS_BOOLEAN(TRUE)); + + if (gst_pad_set_caps (alawdec->srcpad, tempcaps)) + { + return GST_PAD_NEGOTIATE_AGREE; + } + else { + gst_caps_unref (tempcaps); + return GST_PAD_NEGOTIATE_FAIL; + } +} + +GType +gst_alawdec_get_type(void) { + static GType alawdec_type = 0; + + if (!alawdec_type) { + static const GTypeInfo alawdec_info = { + sizeof(GstALawDecClass), NULL, + NULL, + (GClassInitFunc)gst_alawdec_class_init, + NULL, + NULL, + sizeof(GstALawDec), + 0, + (GInstanceInitFunc)gst_alawdec_init, + }; + alawdec_type = g_type_register_static(GST_TYPE_ELEMENT, "GstALawDec", &alawdec_info, 0); + } + return alawdec_type; +} + +static void +gst_alawdec_class_init (GstALawDecClass *klass) +{ + GObjectClass *gobject_class; + GstElementClass *gstelement_class; + + gobject_class = (GObjectClass*)klass; + gstelement_class = (GstElementClass*)klass; + + parent_class = g_type_class_ref(GST_TYPE_ELEMENT); + + gobject_class->set_property = gst_alawdec_set_property; + gobject_class->get_property = gst_alawdec_get_property; +} + +static void +gst_alawdec_init (GstALawDec *alawdec) +{ + alawdec->sinkpad = gst_pad_new_from_template(alawdec_sink_template,"sink"); + alawdec->srcpad = gst_pad_new_from_template(alawdec_src_template,"src"); + gst_pad_set_negotiate_function(alawdec->sinkpad, alawdec_negotiate_sink); + + gst_element_add_pad(GST_ELEMENT(alawdec),alawdec->sinkpad); + gst_pad_set_chain_function(alawdec->sinkpad,gst_alawdec_chain); + gst_element_add_pad(GST_ELEMENT(alawdec),alawdec->srcpad); +} + +static void +gst_alawdec_chain (GstPad *pad,GstBuffer *buf) +{ + GstALawDec *alawdec; + gint16 *linear_data; + guint8 *alaw_data; + GstBuffer* outbuf; + + g_return_if_fail(pad != NULL); + g_return_if_fail(GST_IS_PAD(pad)); + g_return_if_fail(buf != NULL); + + alawdec = GST_ALAWDEC(GST_OBJECT_PARENT (pad)); + g_return_if_fail(alawdec != NULL); + g_return_if_fail(GST_IS_ALAWDEC(alawdec)); + + alaw_data = (guint8 *)GST_BUFFER_DATA(buf); + outbuf=gst_buffer_new(); + GST_BUFFER_DATA(outbuf) = (gchar*)g_new(gint16,GST_BUFFER_SIZE(buf)); + GST_BUFFER_SIZE(outbuf) = GST_BUFFER_SIZE(buf)*2; + + linear_data = (gint16*)GST_BUFFER_DATA(outbuf); + + isdn_audio_alaw2ulaw(alaw_data,GST_BUFFER_SIZE(buf)); + mulaw_decode(alaw_data,linear_data,GST_BUFFER_SIZE(buf)); + + gst_buffer_unref(buf); + gst_pad_push(alawdec->srcpad,outbuf); +} + +static void +gst_alawdec_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) +{ + GstALawDec *alawdec; + + /* it's not null if we got it, but it might not be ours */ + g_return_if_fail(GST_IS_ALAWDEC(object)); + alawdec = GST_ALAWDEC(object); + + switch (prop_id) { + default: + break; + } +} + +static void +gst_alawdec_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) +{ + GstALawDec *alawdec; + + /* it's not null if we got it, but it might not be ours */ + g_return_if_fail(GST_IS_ALAWDEC(object)); + alawdec = GST_ALAWDEC(object); + + switch (prop_id) { + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); + break; + } +} + + |