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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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361 lines
9.4 KiB
C
361 lines
9.4 KiB
C
/*
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* Siren Decoder Gst Element
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*
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* @author: Youness Alaoui <kakaroto@kakaroto.homelinux.net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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*/
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/**
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* SECTION:element-sirendec
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*
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* This decodes audio buffers from the Siren 16 codec (a 16khz extension of
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* G.722.1) that is meant to be compatible with the Microsoft Windows Live
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* Messenger(tm) implementation.
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*
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* Ref: http://www.polycom.com/company/about_us/technology/siren_g7221/index.html
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gstsirendec.h"
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#include <string.h>
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GST_DEBUG_CATEGORY (sirendec_debug);
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#define GST_CAT_DEFAULT (sirendec_debug)
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#define FRAME_DURATION (20 * GST_MSECOND)
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/* elementfactory information */
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static const GstElementDetails gst_siren_dec_details =
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GST_ELEMENT_DETAILS ("Siren Decoder element",
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"Codec/Decoder/Audio ",
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"Decode streams encoded with the Siren7 codec into 16bit PCM",
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"Youness Alaoui <kakaroto@kakaroto.homelinux.net>");
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static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("audio/x-siren, " "dct-length = (int) 320"));
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static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("audio/x-raw-int, "
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"width = (int) 16, "
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"depth = (int) 16, "
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"endianness = (int) 1234, "
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"signed = (boolean) true, "
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"rate = (int) 16000, " "channels = (int) 1"));
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/* signals and args */
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enum
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{
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/* FILL ME */
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LAST_SIGNAL
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};
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enum
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{
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ARG_0,
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};
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static void gst_siren_dec_finalize (GObject * object);
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static GstStateChangeReturn
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gst_siren_change_state (GstElement * element, GstStateChange transition);
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static gboolean gst_siren_dec_sink_setcaps (GstPad * pad, GstCaps * caps);
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static gboolean gst_siren_dec_sink_event (GstPad * pad, GstEvent * event);
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static GstFlowReturn gst_siren_dec_chain (GstPad * pad, GstBuffer * buf);
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static void
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_do_init (GType type)
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{
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GST_DEBUG_CATEGORY_INIT (sirendec_debug, "sirendec", 0, "sirendec");
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}
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GST_BOILERPLATE_FULL (GstSirenDec, gst_siren_dec, GstElement,
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GST_TYPE_ELEMENT, _do_init);
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static void
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gst_siren_dec_base_init (gpointer klass)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&srctemplate));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&sinktemplate));
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gst_element_class_set_details (element_class, &gst_siren_dec_details);
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}
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static void
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gst_siren_dec_class_init (GstSirenDecClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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GST_DEBUG ("Initializing Class");
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gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_siren_dec_finalize);
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gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_siren_change_state);
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GST_DEBUG ("Class Init done");
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}
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static void
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gst_siren_dec_init (GstSirenDec * dec, GstSirenDecClass * klass)
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{
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GST_DEBUG_OBJECT (dec, "Initializing");
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dec->decoder = Siren7_NewDecoder (16000);;
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dec->sinkpad = gst_pad_new_from_static_template (&sinktemplate, "sink");
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dec->srcpad = gst_pad_new_from_static_template (&srctemplate, "src");
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gst_pad_set_setcaps_function (dec->sinkpad,
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GST_DEBUG_FUNCPTR (gst_siren_dec_sink_setcaps));
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gst_pad_set_event_function (dec->sinkpad,
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GST_DEBUG_FUNCPTR (gst_siren_dec_sink_event));
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gst_pad_set_chain_function (dec->sinkpad,
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GST_DEBUG_FUNCPTR (gst_siren_dec_chain));
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gst_element_add_pad (GST_ELEMENT (dec), dec->sinkpad);
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gst_element_add_pad (GST_ELEMENT (dec), dec->srcpad);
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dec->adapter = gst_adapter_new ();
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GST_DEBUG_OBJECT (dec, "Init done");
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}
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static void
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gst_siren_dec_finalize (GObject * object)
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{
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GstSirenDec *dec = GST_SIREN_DEC (object);
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GST_DEBUG_OBJECT (dec, "Finalize");
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Siren7_CloseDecoder (dec->decoder);
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g_object_unref (dec->adapter);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static gboolean
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gst_siren_dec_sink_setcaps (GstPad * pad, GstCaps * caps)
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{
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GstSirenDec *dec;
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gboolean res;
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GstCaps *outcaps;
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dec = GST_SIREN_DEC (GST_PAD_PARENT (pad));
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outcaps = gst_static_pad_template_get_caps (&srctemplate);
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res = gst_pad_set_caps (dec->srcpad, outcaps);
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gst_caps_unref (outcaps);
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return res;
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}
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static gboolean
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gst_siren_dec_sink_event (GstPad * pad, GstEvent * event)
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{
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GstSirenDec *dec;
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gboolean res;
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dec = GST_SIREN_DEC (GST_PAD_PARENT (pad));
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_EOS:
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gst_adapter_clear (dec->adapter);
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res = gst_pad_push_event (dec->srcpad, event);
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break;
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case GST_EVENT_FLUSH_STOP:
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gst_adapter_clear (dec->adapter);
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res = gst_pad_push_event (dec->srcpad, event);
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break;
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default:
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res = gst_pad_push_event (dec->srcpad, event);
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break;
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}
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return res;
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}
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static GstFlowReturn
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gst_siren_dec_chain (GstPad * pad, GstBuffer * buf)
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{
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GstSirenDec *dec;
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GstFlowReturn ret = GST_FLOW_OK;
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GstBuffer *out_buf;
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guint8 *in_data, *out_data;
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guint8 *to_free = NULL;
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guint i, size, num_frames;
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gint out_size, in_size;
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gint decode_ret;
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gboolean discont;
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GstClockTime timestamp;
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guint64 distance;
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GstCaps *outcaps;
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dec = GST_SIREN_DEC (GST_PAD_PARENT (pad));
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discont = GST_BUFFER_IS_DISCONT (buf);
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if (discont) {
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GST_DEBUG_OBJECT (dec, "received DISCONT, flush adapter");
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gst_adapter_clear (dec->adapter);
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dec->discont = TRUE;
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}
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gst_adapter_push (dec->adapter, buf);
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size = gst_adapter_available (dec->adapter);
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GST_LOG_OBJECT (dec, "Received buffer of size %u with adapter of size : %u",
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GST_BUFFER_SIZE (buf), size);
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/* process 40 input bytes into 640 output bytes */
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num_frames = size / 40;
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if (num_frames == 0)
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goto done;
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/* this is the input/output size */
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in_size = num_frames * 40;
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out_size = num_frames * 640;
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GST_LOG_OBJECT (dec, "we have %u frames, %u in, %u out", num_frames, in_size,
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out_size);
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/* set output caps when needed */
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if ((outcaps = GST_PAD_CAPS (dec->srcpad)) == NULL) {
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outcaps = gst_static_pad_template_get_caps (&srctemplate);
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gst_pad_set_caps (dec->srcpad, outcaps);
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gst_caps_unref (outcaps);
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}
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/* get a buffer */
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ret = gst_pad_alloc_buffer_and_set_caps (dec->srcpad, -1,
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out_size, outcaps, &out_buf);
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if (ret != GST_FLOW_OK)
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goto alloc_failed;
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/* get the timestamp for the output buffer */
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timestamp = gst_adapter_prev_timestamp (dec->adapter, &distance);
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/* add the amount of time taken by the distance, each frame is 20ms */
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if (timestamp != -1)
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timestamp += (distance / 40) * FRAME_DURATION;
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GST_LOG_OBJECT (dec,
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"timestamp %" GST_TIME_FORMAT ", distance %" G_GUINT64_FORMAT,
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GST_TIME_ARGS (timestamp), distance);
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/* get the input data for all the frames */
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to_free = in_data = gst_adapter_take (dec->adapter, in_size);
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out_data = GST_BUFFER_DATA (out_buf);
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for (i = 0; i < num_frames; i++) {
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GST_LOG_OBJECT (dec, "Decoding frame %u/%u", i, num_frames);
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/* decode 40 input bytes to 640 output bytes */
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decode_ret = Siren7_DecodeFrame (dec->decoder, in_data, out_data);
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if (decode_ret != 0)
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goto decode_error;
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/* move to next frame */
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out_data += 640;
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in_data += 40;
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}
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GST_LOG_OBJECT (dec, "Finished decoding");
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/* mark discont */
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if (dec->discont) {
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GST_BUFFER_FLAG_SET (out_buf, GST_BUFFER_FLAG_DISCONT);
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dec->discont = FALSE;
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}
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GST_BUFFER_TIMESTAMP (out_buf) = timestamp;
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GST_BUFFER_DURATION (out_buf) = num_frames * FRAME_DURATION;
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ret = gst_pad_push (dec->srcpad, out_buf);
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done:
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if (to_free)
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g_free (to_free);
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return ret;
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/* ERRORS */
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alloc_failed:
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{
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GST_DEBUG_OBJECT (dec, "failed to pad_alloc buffer: %d (%s)", ret,
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gst_flow_get_name (ret));
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goto done;
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}
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decode_error:
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{
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GST_ELEMENT_ERROR (dec, STREAM, DECODE, (NULL),
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("Error decoding frame: %d", decode_ret));
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ret = GST_FLOW_ERROR;
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gst_buffer_unref (out_buf);
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goto done;
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}
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}
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static GstStateChangeReturn
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gst_siren_change_state (GstElement * element, GstStateChange transition)
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{
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GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
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GstSirenDec *dec = GST_SIREN_DEC (element);
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switch (transition) {
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case GST_STATE_CHANGE_READY_TO_PAUSED:
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dec->discont = FALSE;
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break;
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default:
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break;
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}
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ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
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switch (transition) {
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case GST_STATE_CHANGE_PAUSED_TO_READY:
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gst_adapter_clear (dec->adapter);
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break;
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default:
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break;
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}
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return ret;
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}
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gboolean
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gst_siren_dec_plugin_init (GstPlugin * plugin)
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{
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return gst_element_register (plugin, "sirendec",
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GST_RANK_MARGINAL, GST_TYPE_SIREN_DEC);
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}
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