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/* GStreamer Adaptive Multi-Rate Wide-Band (AMR-WB) plugin
* Copyright (C) 2006 Edgard Lima <edgard.lima@indt.org.br>
*
* 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 "gstamrwbenc.h"
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-raw-int, "
"width = (int) 16, "
"depth = (int) 16, "
"signed = (boolean) TRUE, "
"endianness = (int) BYTE_ORDER, "
"rate = (int) 16000, " "channels = (int) 1")
);
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/AMR-WB, "
"rate = (int) 16000, " "channels = (int) 1")
);
GST_DEBUG_CATEGORY_STATIC (gst_amrwbenc_debug);
#define GST_CAT_DEFAULT gst_amrwbenc_debug
static void gst_amrwbenc_finalize (GObject * object);
static GstFlowReturn gst_amrwbenc_chain (GstPad * pad, GstBuffer * buffer);
static gboolean gst_amrwbenc_setcaps (GstPad * pad, GstCaps * caps);
static GstStateChangeReturn gst_amrwbenc_state_change (GstElement * element,
GstStateChange transition);
#define _do_init(bla) \
GST_DEBUG_CATEGORY_INIT (gst_amrwbenc_debug, "amrwbenc", 0, "AMR-WB audio encoder");
GST_BOILERPLATE_FULL (GstAmrwbEnc, gst_amrwbenc, GstElement, GST_TYPE_ELEMENT,
_do_init);
static void
gst_amrwbenc_base_init (gpointer klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstElementDetails details = GST_ELEMENT_DETAILS ("AMR-WB audio encoder",
"Codec/Encoder/Audio",
"Adaptive Multi-Rate Wideband audio encoder",
"Renato Araujo <renato.filho@indt.org.br>");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_template));
gst_element_class_set_details (element_class, &details);
}
static void
gst_amrwbenc_class_init (GstAmrwbEncClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
object_class->finalize = gst_amrwbenc_finalize;
element_class->change_state = GST_DEBUG_FUNCPTR (gst_amrwbenc_state_change);
}
static void
gst_amrwbenc_init (GstAmrwbEnc * amrwbenc, GstAmrwbEncClass * klass)
{
/* create the sink pad */
amrwbenc->sinkpad = gst_pad_new_from_static_template (&sink_template, "sink");
gst_pad_set_setcaps_function (amrwbenc->sinkpad, gst_amrwbenc_setcaps);
gst_pad_set_chain_function (amrwbenc->sinkpad, gst_amrwbenc_chain);
gst_element_add_pad (GST_ELEMENT (amrwbenc), amrwbenc->sinkpad);
/* create the src pad */
amrwbenc->srcpad = gst_pad_new_from_static_template (&src_template, "src");
gst_pad_use_fixed_caps (amrwbenc->srcpad);
gst_element_add_pad (GST_ELEMENT (amrwbenc), amrwbenc->srcpad);
amrwbenc->adapter = gst_adapter_new ();
/* init rest */
amrwbenc->handle = NULL;
amrwbenc->channels = 0;
amrwbenc->rate = 0;
amrwbenc->ts = 0;
}
static void
gst_amrwbenc_finalize (GObject * object)
{
GstAmrwbEnc *amrwbenc;
amrwbenc = GST_AMRWBENC (object);
g_object_unref (G_OBJECT (amrwbenc->adapter));
amrwbenc->adapter = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_amrwbenc_setcaps (GstPad * pad, GstCaps * caps)
{
GstStructure *structure;
GstAmrwbEnc *amrwbenc;
GstCaps *copy;
amrwbenc = GST_AMRWBENC (GST_PAD_PARENT (pad));
structure = gst_caps_get_structure (caps, 0);
/* get channel count */
gst_structure_get_int (structure, "channels", &amrwbenc->channels);
gst_structure_get_int (structure, "rate", &amrwbenc->rate);
/* this is not wrong but will sound bad */
if (amrwbenc->channels != 1) {
GST_WARNING ("amrwbdec is only optimized for mono channels");
}
if (amrwbenc->rate != 16000) {
GST_WARNING ("amrwbdec is only optimized for 16000 Hz samplerate");
}
/* create reverse caps */
copy = gst_caps_new_simple ("audio/AMR-WB",
"channels", G_TYPE_INT, amrwbenc->channels,
"rate", G_TYPE_INT, amrwbenc->rate, NULL);
gst_pad_set_caps (amrwbenc->srcpad, copy);
gst_caps_unref (copy);
return TRUE;
}
static GstFlowReturn
gst_amrwbenc_chain (GstPad * pad, GstBuffer * buffer)
{
GstAmrwbEnc *amrwbenc;
GstFlowReturn ret = GST_FLOW_OK;
const int buffer_size = sizeof (Word16) * L_FRAME16k;
amrwbenc = GST_AMRWBENC (gst_pad_get_parent (pad));
g_return_val_if_fail (amrwbenc->handle, GST_FLOW_WRONG_STATE);
if (amrwbenc->rate == 0 || amrwbenc->channels == 0) {
ret = GST_FLOW_NOT_NEGOTIATED;
goto done;
}
if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
amrwbenc->ts = GST_BUFFER_TIMESTAMP (buffer);
ret = GST_FLOW_OK;
gst_adapter_push (amrwbenc->adapter, buffer);
/* Collect samples until we have enough for an output frame */
while (gst_adapter_available (amrwbenc->adapter) >= buffer_size) {
GstBuffer *out;
guint8 *data;
gint outsize;
out = gst_buffer_new_and_alloc (buffer_size);
GST_BUFFER_DURATION (out) = GST_SECOND * L_FRAME16k /
(amrwbenc->rate * amrwbenc->channels);
GST_BUFFER_TIMESTAMP (out) = amrwbenc->ts;
amrwbenc->ts += GST_BUFFER_DURATION (out);
gst_buffer_set_caps (out, gst_pad_get_caps (amrwbenc->srcpad));
data = (guint8 *) gst_adapter_peek (amrwbenc->adapter, buffer_size);
/* encode */
outsize = E_IF_encode (amrwbenc->handle, 0, (Word16 *) data,
(UWord8 *) GST_BUFFER_DATA (out), 0);
gst_adapter_flush (amrwbenc->adapter, buffer_size);
GST_BUFFER_SIZE (out) = outsize;
ret = gst_pad_push (amrwbenc->srcpad, out);
}
done:
gst_object_unref (amrwbenc);
return ret;
}
static GstStateChangeReturn
gst_amrwbenc_state_change (GstElement * element, GstStateChange transition)
{
GstAmrwbEnc *amrwbenc;
GstStateChangeReturn ret;
amrwbenc = GST_AMRWBENC (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
if (!(amrwbenc->handle = E_IF_init ()))
return GST_STATE_CHANGE_FAILURE;
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
amrwbenc->ts = 0;
gst_adapter_clear (amrwbenc->adapter);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_NULL:
E_IF_exit (amrwbenc->handle);
break;
default:
break;
}
return ret;
}
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