diff options
Diffstat (limited to 'ext/gsm/gstgsmdec.c')
| -rw-r--r-- | ext/gsm/gstgsmdec.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/ext/gsm/gstgsmdec.c b/ext/gsm/gstgsmdec.c new file mode 100644 index 00000000..d408e3b8 --- /dev/null +++ b/ext/gsm/gstgsmdec.c @@ -0,0 +1,183 @@ +/* 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 <string.h> + +#include "gstgsmdec.h" + +extern GstPadTemplate *gsmdec_src_template, *gsmdec_sink_template; + +/* elementfactory information */ +GstElementDetails gst_gsmdec_details = { + "gsm audio decoder", + "Filter/Decoder/Audio", + ".gsm", + VERSION, + "Wim Taymans <wim.taymans@chello.be>", + "(C) 2000", +}; + +/* GSMDec signals and args */ +enum { + /* FILL ME */ + LAST_SIGNAL +}; + +enum { + ARG_0, + /* FILL ME */ +}; + +static void gst_gsmdec_class_init (GstGSMDec *klass); +static void gst_gsmdec_init (GstGSMDec *gsmdec); + +static void gst_gsmdec_chain (GstPad *pad, GstBuffer *buf); +static void gst_gsmdec_newcaps (GstPad *pad, GstCaps *caps); + +static GstElementClass *parent_class = NULL; +//static guint gst_gsmdec_signals[LAST_SIGNAL] = { 0 }; + +GType +gst_gsmdec_get_type(void) { + static GType gsmdec_type = 0; + + if (!gsmdec_type) { + static const GTypeInfo gsmdec_info = { + sizeof(GstGSMDecClass), NULL, + NULL, + (GClassInitFunc)gst_gsmdec_class_init, + NULL, + NULL, + sizeof(GstGSMDec), + 0, + (GInstanceInitFunc)gst_gsmdec_init, + }; + gsmdec_type = g_type_register_static(GST_TYPE_ELEMENT, "GstGSMDec", &gsmdec_info, 0); + } + return gsmdec_type; +} + +static void +gst_gsmdec_class_init (GstGSMDec *klass) +{ + GstElementClass *gstelement_class; + + gstelement_class = (GstElementClass*)klass; + + parent_class = g_type_class_ref(GST_TYPE_ELEMENT); +} + +static void +gst_gsmdec_init (GstGSMDec *gsmdec) +{ + GST_DEBUG (0,"gst_gsmdec_init: initializing\n"); + + /* create the sink and src pads */ + gsmdec->sinkpad = gst_pad_new_from_template (gsmdec_sink_template, "sink"); + gst_element_add_pad (GST_ELEMENT (gsmdec), gsmdec->sinkpad); + gst_pad_set_chain_function (gsmdec->sinkpad, gst_gsmdec_chain); + gst_pad_set_newcaps_function (gsmdec->sinkpad, gst_gsmdec_newcaps); + + gsmdec->srcpad = gst_pad_new_from_template (gsmdec_src_template, "src"); + gst_element_add_pad (GST_ELEMENT (gsmdec), gsmdec->srcpad); + + gsmdec->state = gsm_create (); + gsmdec->bufsize = 0; +} + +static void +gst_gsmdec_newcaps (GstPad *pad, GstCaps *caps) +{ + GstGSMDec *gsmdec; + + gsmdec = GST_GSMDEC (gst_pad_get_parent (pad)); + + gst_pad_set_caps (gsmdec->srcpad, GST_CAPS_NEW ( + "gsm_raw", + "audio/raw", + "format", GST_PROPS_STRING ("int"), + "law", GST_PROPS_INT (0), + "endianness", GST_PROPS_INT (G_BYTE_ORDER), + "signed", GST_PROPS_BOOLEAN (TRUE), + "width", GST_PROPS_INT (16), + "depth", GST_PROPS_INT (16), + "rate", GST_PROPS_INT (gst_caps_get_int (caps, "rate")), + "channels", GST_PROPS_INT (1) + )); +} + +static void +gst_gsmdec_chain (GstPad *pad, GstBuffer *buf) +{ + GstGSMDec *gsmdec; + gsm_byte *data; + guint size; + + g_return_if_fail(pad != NULL); + g_return_if_fail(GST_IS_PAD(pad)); + g_return_if_fail(buf != NULL); + //g_return_if_fail(GST_IS_BUFFER(buf)); + + gsmdec = GST_GSMDEC (gst_pad_get_parent (pad)); + + data = (gsm_byte*) GST_BUFFER_DATA (buf); + size = GST_BUFFER_SIZE (buf); + + if (gsmdec->bufsize && (gsmdec->bufsize + size >= 33)) { + GstBuffer *outbuf; + + memcpy (gsmdec->buffer + gsmdec->bufsize, data, (33 - gsmdec->bufsize) * sizeof (gsm_byte)); + + outbuf = gst_buffer_new (); + GST_BUFFER_DATA (outbuf) = g_malloc (160 * sizeof (gsm_signal)); + GST_BUFFER_SIZE (outbuf) = 160 * sizeof (gsm_signal); + + gsm_decode (gsmdec->state, gsmdec->buffer, (gsm_signal *) GST_BUFFER_DATA (outbuf)); + + gst_pad_push (gsmdec->srcpad, outbuf); + + size -= (33 - gsmdec->bufsize); + data += (33 - gsmdec->bufsize); + gsmdec->bufsize = 0; + } + + while (size >= 33) { + GstBuffer *outbuf; + + outbuf = gst_buffer_new (); + GST_BUFFER_DATA (outbuf) = g_malloc (160 * sizeof (gsm_signal)); + GST_BUFFER_SIZE (outbuf) = 160 * sizeof (gsm_signal); + + gsm_decode (gsmdec->state, data, (gsm_signal *)GST_BUFFER_DATA (outbuf)); + + gst_pad_push (gsmdec->srcpad, outbuf); + + size -= 33; + data += 33; + } + + if (size) { + memcpy (gsmdec->buffer + gsmdec->bufsize, data, size * sizeof (gsm_byte)); + gsmdec->bufsize += size; + } + + gst_buffer_unref(buf); +} + |