gstreamer/gst/siren/gstsirendec.c

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/*
* Siren Decoder Gst Element
*
* @author: Youness Alaoui <kakaroto@kakaroto.homelinux.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-sirendec
*
* This decodes audio buffers from the Siren 16 codec (a 16khz extension of
* G.722.1) that is meant to be compatible with the Microsoft Windows Live
* Messenger(tm) implementation.
*
* Ref: http://www.polycom.com/company/about_us/technology/siren_g7221/index.html
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstsirendec.h"
#include <string.h>
GST_DEBUG_CATEGORY (sirendec_debug);
#define GST_CAT_DEFAULT (sirendec_debug)
#define FRAME_DURATION (20 * GST_MSECOND)
/* elementfactory information */
static const GstElementDetails gst_siren_dec_details =
GST_ELEMENT_DETAILS ("Siren Decoder element",
"Codec/Decoder/Audio ",
"Decode streams encoded with the Siren7 codec into 16bit PCM",
"Youness Alaoui <kakaroto@kakaroto.homelinux.net>");
static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-siren, " "dct-length = (int) 320"));
static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-raw-int, "
"width = (int) 16, "
"depth = (int) 16, "
"endianness = (int) 1234, "
"signed = (boolean) true, "
"rate = (int) 16000, " "channels = (int) 1"));
/* signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0,
};
static void gst_siren_dec_finalize (GObject * object);
static GstStateChangeReturn
gst_siren_change_state (GstElement * element, GstStateChange transition);
static gboolean gst_siren_dec_sink_setcaps (GstPad * pad, GstCaps * caps);
static gboolean gst_siren_dec_sink_event (GstPad * pad, GstEvent * event);
static GstFlowReturn gst_siren_dec_chain (GstPad * pad, GstBuffer * buf);
static void
_do_init (GType type)
{
GST_DEBUG_CATEGORY_INIT (sirendec_debug, "sirendec", 0, "sirendec");
}
GST_BOILERPLATE_FULL (GstSirenDec, gst_siren_dec, GstElement,
GST_TYPE_ELEMENT, _do_init);
static void
gst_siren_dec_base_init (gpointer klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&srctemplate));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sinktemplate));
gst_element_class_set_details (element_class, &gst_siren_dec_details);
}
static void
gst_siren_dec_class_init (GstSirenDecClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
GST_DEBUG ("Initializing Class");
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_siren_dec_finalize);
gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_siren_change_state);
GST_DEBUG ("Class Init done");
}
static void
gst_siren_dec_init (GstSirenDec * dec, GstSirenDecClass * klass)
{
GST_DEBUG_OBJECT (dec, "Initializing");
dec->decoder = Siren7_NewDecoder (16000);;
dec->sinkpad = gst_pad_new_from_static_template (&sinktemplate, "sink");
dec->srcpad = gst_pad_new_from_static_template (&srctemplate, "src");
gst_pad_set_setcaps_function (dec->sinkpad,
GST_DEBUG_FUNCPTR (gst_siren_dec_sink_setcaps));
gst_pad_set_event_function (dec->sinkpad,
GST_DEBUG_FUNCPTR (gst_siren_dec_sink_event));
gst_pad_set_chain_function (dec->sinkpad,
GST_DEBUG_FUNCPTR (gst_siren_dec_chain));
gst_element_add_pad (GST_ELEMENT (dec), dec->sinkpad);
gst_element_add_pad (GST_ELEMENT (dec), dec->srcpad);
dec->adapter = gst_adapter_new ();
GST_DEBUG_OBJECT (dec, "Init done");
}
static void
gst_siren_dec_finalize (GObject * object)
{
GstSirenDec *dec = GST_SIREN_DEC (object);
GST_DEBUG_OBJECT (dec, "Finalize");
Siren7_CloseDecoder (dec->decoder);
g_object_unref (dec->adapter);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_siren_dec_sink_setcaps (GstPad * pad, GstCaps * caps)
{
GstSirenDec *dec;
gboolean res;
GstCaps *outcaps;
dec = GST_SIREN_DEC (GST_PAD_PARENT (pad));
outcaps = gst_static_pad_template_get_caps (&srctemplate);
res = gst_pad_set_caps (dec->srcpad, outcaps);
gst_caps_unref (outcaps);
return res;
}
static gboolean
gst_siren_dec_sink_event (GstPad * pad, GstEvent * event)
{
GstSirenDec *dec;
gboolean res;
dec = GST_SIREN_DEC (GST_PAD_PARENT (pad));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
gst_adapter_clear (dec->adapter);
res = gst_pad_push_event (dec->srcpad, event);
break;
case GST_EVENT_FLUSH_STOP:
gst_adapter_clear (dec->adapter);
res = gst_pad_push_event (dec->srcpad, event);
break;
default:
res = gst_pad_push_event (dec->srcpad, event);
break;
}
return res;
}
static GstFlowReturn
gst_siren_dec_chain (GstPad * pad, GstBuffer * buf)
{
GstSirenDec *dec;
GstFlowReturn ret = GST_FLOW_OK;
GstBuffer *out_buf;
guint8 *in_data, *out_data;
guint8 *to_free = NULL;
guint i, size, num_frames;
gint out_size, in_size;
gint decode_ret;
gboolean discont;
GstClockTime timestamp;
guint64 distance;
GstCaps *outcaps;
dec = GST_SIREN_DEC (GST_PAD_PARENT (pad));
discont = GST_BUFFER_IS_DISCONT (buf);
if (discont) {
GST_DEBUG_OBJECT (dec, "received DISCONT, flush adapter");
gst_adapter_clear (dec->adapter);
dec->discont = TRUE;
}
gst_adapter_push (dec->adapter, buf);
size = gst_adapter_available (dec->adapter);
GST_LOG_OBJECT (dec, "Received buffer of size %u with adapter of size : %u",
GST_BUFFER_SIZE (buf), size);
/* process 40 input bytes into 640 output bytes */
num_frames = size / 40;
if (num_frames == 0)
goto done;
/* this is the input/output size */
in_size = num_frames * 40;
out_size = num_frames * 640;
GST_LOG_OBJECT (dec, "we have %u frames, %u in, %u out", num_frames, in_size,
out_size);
/* set output caps when needed */
if ((outcaps = GST_PAD_CAPS (dec->srcpad)) == NULL) {
outcaps = gst_static_pad_template_get_caps (&srctemplate);
gst_pad_set_caps (dec->srcpad, outcaps);
gst_caps_unref (outcaps);
}
/* get a buffer */
ret = gst_pad_alloc_buffer_and_set_caps (dec->srcpad, -1,
out_size, outcaps, &out_buf);
if (ret != GST_FLOW_OK)
goto alloc_failed;
/* get the timestamp for the output buffer */
timestamp = gst_adapter_prev_timestamp (dec->adapter, &distance);
/* add the amount of time taken by the distance, each frame is 20ms */
if (timestamp != -1)
timestamp += (distance / 40) * FRAME_DURATION;
GST_LOG_OBJECT (dec,
"timestamp %" GST_TIME_FORMAT ", distance %" G_GUINT64_FORMAT,
GST_TIME_ARGS (timestamp), distance);
/* get the input data for all the frames */
to_free = in_data = gst_adapter_take (dec->adapter, in_size);
out_data = GST_BUFFER_DATA (out_buf);
for (i = 0; i < num_frames; i++) {
GST_LOG_OBJECT (dec, "Decoding frame %u/%u", i, num_frames);
/* decode 40 input bytes to 640 output bytes */
decode_ret = Siren7_DecodeFrame (dec->decoder, in_data, out_data);
if (decode_ret != 0)
goto decode_error;
/* move to next frame */
out_data += 640;
in_data += 40;
}
GST_LOG_OBJECT (dec, "Finished decoding");
/* mark discont */
if (dec->discont) {
GST_BUFFER_FLAG_SET (out_buf, GST_BUFFER_FLAG_DISCONT);
dec->discont = FALSE;
}
GST_BUFFER_TIMESTAMP (out_buf) = timestamp;
GST_BUFFER_DURATION (out_buf) = num_frames * FRAME_DURATION;
ret = gst_pad_push (dec->srcpad, out_buf);
done:
if (to_free)
g_free (to_free);
return ret;
/* ERRORS */
alloc_failed:
{
GST_DEBUG_OBJECT (dec, "failed to pad_alloc buffer: %d (%d)", ret,
gst_flow_get_name (ret));
goto done;
}
decode_error:
{
GST_ELEMENT_ERROR (dec, STREAM, DECODE, (NULL),
("Error decoding frame: %d", decode_ret));
ret = GST_FLOW_ERROR;
gst_buffer_unref (out_buf);
goto done;
}
}
static GstStateChangeReturn
gst_siren_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
GstSirenDec *dec = GST_SIREN_DEC (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
dec->discont = FALSE;
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_adapter_clear (dec->adapter);
break;
default:
break;
}
return ret;
}
gboolean
gst_siren_dec_plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "sirendec",
GST_RANK_MARGINAL, GST_TYPE_SIREN_DEC);
}