gstreamer/ext/amrnb/amrnbdec.c

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/* GStreamer Adaptive Multi-Rate Narrow-Band (AMR-NB) plugin
* Copyright (C) 2004 Ronald Bultje <rbultje@ronald.bitfreak.net>
*
* 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.
*/
/**
* SECTION:element-amrnbdec
* @see_also: #GstAmrnbEnc, #GstAmrnbParse
*
* AMR narrowband decoder based on the
* <ulink url="http://www.penguin.cz/~utx/amr">reference codec implementation</ulink>.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch filesrc location=abc.amr ! amrnbparse ! amrnbdec ! audioresample ! audioconvert ! alsasink
* ]|
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "amrnbdec.h"
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/AMR, " "rate = (int) 8000, " "channels = (int) 1")
);
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
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) 8000," "channels = (int) 1")
);
GST_DEBUG_CATEGORY_STATIC (gst_amrnbdec_debug);
#define GST_CAT_DEFAULT gst_amrnbdec_debug
static const gint block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5,
0, 0, 0, 0, 0, 0, 0
};
static gboolean gst_amrnbdec_event (GstPad * pad, GstEvent * event);
static GstFlowReturn gst_amrnbdec_chain (GstPad * pad, GstBuffer * buffer);
static gboolean gst_amrnbdec_setcaps (GstPad * pad, GstCaps * caps);
static GstStateChangeReturn gst_amrnbdec_state_change (GstElement * element,
GstStateChange transition);
static void gst_amrnbdec_finalize (GObject * object);
#define _do_init(bla) \
GST_DEBUG_CATEGORY_INIT (gst_amrnbdec_debug, "amrnbdec", 0, "AMR-NB audio decoder");
GST_BOILERPLATE_FULL (GstAmrnbDec, gst_amrnbdec, GstElement, GST_TYPE_ELEMENT,
_do_init);
static void
gst_amrnbdec_base_init (gpointer klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstElementDetails details = GST_ELEMENT_DETAILS ("AMR-NB audio decoder",
"Codec/Decoder/Audio",
"Adaptive Multi-Rate Narrow-Band audio decoder",
"Ronald Bultje <rbultje@ronald.bitfreak.net>");
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_amrnbdec_class_init (GstAmrnbDecClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
object_class->finalize = gst_amrnbdec_finalize;
element_class->change_state = GST_DEBUG_FUNCPTR (gst_amrnbdec_state_change);
}
static void
gst_amrnbdec_init (GstAmrnbDec * amrnbdec, GstAmrnbDecClass * klass)
{
/* create the sink pad */
amrnbdec->sinkpad = gst_pad_new_from_static_template (&sink_template, "sink");
gst_pad_set_setcaps_function (amrnbdec->sinkpad, gst_amrnbdec_setcaps);
gst_pad_set_event_function (amrnbdec->sinkpad, gst_amrnbdec_event);
gst_pad_set_chain_function (amrnbdec->sinkpad, gst_amrnbdec_chain);
gst_element_add_pad (GST_ELEMENT (amrnbdec), amrnbdec->sinkpad);
/* create the src pad */
amrnbdec->srcpad = gst_pad_new_from_static_template (&src_template, "src");
gst_pad_use_fixed_caps (amrnbdec->srcpad);
gst_element_add_pad (GST_ELEMENT (amrnbdec), amrnbdec->srcpad);
amrnbdec->adapter = gst_adapter_new ();
/* init rest */
amrnbdec->handle = NULL;
}
static void
gst_amrnbdec_finalize (GObject * object)
{
GstAmrnbDec *amrnbdec;
amrnbdec = GST_AMRNBDEC (object);
gst_adapter_clear (amrnbdec->adapter);
g_object_unref (amrnbdec->adapter);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_amrnbdec_setcaps (GstPad * pad, GstCaps * caps)
{
GstStructure *structure;
GstAmrnbDec *amrnbdec;
GstCaps *copy;
amrnbdec = GST_AMRNBDEC (gst_pad_get_parent (pad));
structure = gst_caps_get_structure (caps, 0);
/* get channel count */
gst_structure_get_int (structure, "channels", &amrnbdec->channels);
gst_structure_get_int (structure, "rate", &amrnbdec->rate);
/* create reverse caps */
copy = gst_caps_new_simple ("audio/x-raw-int",
"channels", G_TYPE_INT, amrnbdec->channels,
"width", G_TYPE_INT, 16,
"depth", G_TYPE_INT, 16,
"endianness", G_TYPE_INT, G_BYTE_ORDER,
"rate", G_TYPE_INT, amrnbdec->rate, "signed", G_TYPE_BOOLEAN, TRUE, NULL);
amrnbdec->duration = gst_util_uint64_scale_int (GST_SECOND, 160,
amrnbdec->rate * amrnbdec->channels);
gst_pad_set_caps (amrnbdec->srcpad, copy);
gst_caps_unref (copy);
gst_object_unref (amrnbdec);
return TRUE;
}
static gboolean
gst_amrnbdec_event (GstPad * pad, GstEvent * event)
{
GstAmrnbDec *amrnbdec;
gboolean ret = TRUE;
amrnbdec = GST_AMRNBDEC (gst_pad_get_parent (pad));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
ret = gst_pad_push_event (amrnbdec->srcpad, event);
break;
case GST_EVENT_FLUSH_STOP:
ret = gst_pad_push_event (amrnbdec->srcpad, event);
gst_adapter_clear (amrnbdec->adapter);
amrnbdec->ts = -1;
break;
case GST_EVENT_EOS:
gst_adapter_clear (amrnbdec->adapter);
ret = gst_pad_push_event (amrnbdec->srcpad, event);
break;
case GST_EVENT_NEWSEGMENT:
{
GstFormat format;
gdouble rate, arate;
gint64 start, stop, time;
gboolean update;
gst_event_parse_new_segment_full (event, &update, &rate, &arate, &format,
&start, &stop, &time);
/* we need time for now */
if (format != GST_FORMAT_TIME)
goto newseg_wrong_format;
GST_DEBUG_OBJECT (amrnbdec,
"newsegment: update %d, rate %g, arate %g, start %" GST_TIME_FORMAT
", stop %" GST_TIME_FORMAT ", time %" GST_TIME_FORMAT,
update, rate, arate, GST_TIME_ARGS (start), GST_TIME_ARGS (stop),
GST_TIME_ARGS (time));
/* now configure the values */
gst_segment_set_newsegment_full (&amrnbdec->segment, update,
rate, arate, format, start, stop, time);
ret = gst_pad_push_event (amrnbdec->srcpad, event);
}
break;
default:
ret = gst_pad_push_event (amrnbdec->srcpad, event);
break;
}
done:
gst_object_unref (amrnbdec);
return ret;
/* ERRORS */
newseg_wrong_format:
{
GST_DEBUG_OBJECT (amrnbdec, "received non TIME newsegment");
goto done;
}
}
static GstFlowReturn
gst_amrnbdec_chain (GstPad * pad, GstBuffer * buffer)
{
GstAmrnbDec *amrnbdec;
GstFlowReturn ret;
amrnbdec = GST_AMRNBDEC (gst_pad_get_parent (pad));
if (amrnbdec->rate == 0 || amrnbdec->channels == 0)
goto not_negotiated;
/* discontinuity, don't combine samples before and after the
* DISCONT */
if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT)) {
gst_adapter_clear (amrnbdec->adapter);
amrnbdec->ts = -1;
amrnbdec->discont = TRUE;
}
/* take latest timestamp, FIXME timestamp is the one of the
* first buffer in the adapter. */
if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
amrnbdec->ts = GST_BUFFER_TIMESTAMP (buffer);
gst_adapter_push (amrnbdec->adapter, buffer);
ret = GST_FLOW_OK;
while (TRUE) {
GstBuffer *out;
guint8 *data;
gint block, mode;
/* need to peek data to get the size */
if (gst_adapter_available (amrnbdec->adapter) < 1)
break;
data = (guint8 *) gst_adapter_peek (amrnbdec->adapter, 1);
/* get size */
mode = (data[0] >> 3) & 0x0F;
block = block_size[mode] + 1;
GST_DEBUG_OBJECT (amrnbdec, "mode %d, block %d", mode, block);
if (!block || gst_adapter_available (amrnbdec->adapter) < block)
break;
/* the library seems to write into the source data, hence
* the copy. */
data = gst_adapter_take (amrnbdec->adapter, block);
/* get output */
out = gst_buffer_new_and_alloc (160 * 2);
GST_BUFFER_DURATION (out) = amrnbdec->duration;
GST_BUFFER_TIMESTAMP (out) = amrnbdec->ts;
if (amrnbdec->ts != -1)
amrnbdec->ts += amrnbdec->duration;
if (amrnbdec->discont) {
GST_BUFFER_FLAG_SET (out, GST_BUFFER_FLAG_DISCONT);
amrnbdec->discont = FALSE;
}
gst_buffer_set_caps (out, GST_PAD_CAPS (amrnbdec->srcpad));
/* decode */
Decoder_Interface_Decode (amrnbdec->handle, data,
(short *) GST_BUFFER_DATA (out), 0);
g_free (data);
/* send out */
ret = gst_pad_push (amrnbdec->srcpad, out);
}
gst_object_unref (amrnbdec);
return ret;
/* ERRORS */
not_negotiated:
{
GST_ELEMENT_ERROR (amrnbdec, STREAM, TYPE_NOT_FOUND, (NULL),
("Decoder is not initialized"));
gst_object_unref (amrnbdec);
return GST_FLOW_NOT_NEGOTIATED;
}
}
static GstStateChangeReturn
gst_amrnbdec_state_change (GstElement * element, GstStateChange transition)
{
GstAmrnbDec *amrnbdec;
GstStateChangeReturn ret;
amrnbdec = GST_AMRNBDEC (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
if (!(amrnbdec->handle = Decoder_Interface_init ()))
goto init_failed;
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_adapter_clear (amrnbdec->adapter);
amrnbdec->rate = 0;
amrnbdec->channels = 0;
amrnbdec->ts = -1;
amrnbdec->discont = TRUE;
gst_segment_init (&amrnbdec->segment, GST_FORMAT_TIME);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_NULL:
Decoder_Interface_exit (amrnbdec->handle);
break;
default:
break;
}
return ret;
/* ERRORS */
init_failed:
{
GST_ELEMENT_ERROR (amrnbdec, LIBRARY, INIT, (NULL),
("Failed to open AMR Decoder"));
return GST_STATE_CHANGE_FAILURE;
}
}