gstgsmenc.c 6.53 KB
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/* GStreamer
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 * 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.
 */


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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
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#include <string.h>

#include "gstgsmenc.h"

/* elementfactory information */
GstElementDetails gst_gsmenc_details = {
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  "GSM audio encoder",
  "Codec/Encoder/Audio",
  "Encodes audio using GSM",
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  "Wim Taymans <wim.taymans@chello.be>",
};

/* GSMEnc signals and args */
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enum
{
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  FRAME_ENCODED,
  /* FILL ME */
  LAST_SIGNAL
};

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enum
{
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  ARG_0
      /* FILL ME */
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};

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static void gst_gsmenc_base_init (gpointer g_class);
static void gst_gsmenc_class_init (GstGSMEnc * klass);
static void gst_gsmenc_init (GstGSMEnc * gsmenc);
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static void gst_gsmenc_chain (GstPad * pad, GstData * _data);
static GstPadLinkReturn gst_gsmenc_sinkconnect (GstPad * pad,
    const GstCaps * caps);
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static GstElementClass *parent_class = NULL;
static guint gst_gsmenc_signals[LAST_SIGNAL] = { 0 };

GType
gst_gsmenc_get_type (void)
{
  static GType gsmenc_type = 0;

  if (!gsmenc_type) {
    static const GTypeInfo gsmenc_info = {
      sizeof (GstGSMEncClass),
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      gst_gsmenc_base_init,
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      NULL,
      (GClassInitFunc) gst_gsmenc_class_init,
      NULL,
      NULL,
      sizeof (GstGSMEnc),
      0,
      (GInstanceInitFunc) gst_gsmenc_init,
    };
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    gsmenc_type =
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        g_type_register_static (GST_TYPE_ELEMENT, "GstGSMEnc", &gsmenc_info, 0);
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  }
  return gsmenc_type;
}

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static GstStaticPadTemplate gsmenc_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
    GST_PAD_SRC,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("audio/x-gsm, "
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        "rate = (int) [ 1000, 48000 ], " "channels = (int) 1")
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    );
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static GstStaticPadTemplate gsmenc_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
    GST_PAD_SINK,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("audio/x-raw-int, "
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        "endianness = (int) BYTE_ORDER, "
        "signed = (boolean) true, "
        "width = (int) 16, "
        "depth = (int) 16, "
        "rate = (int) [ 1000, 48000 ], " "channels = (int) 1")
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    );
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static void
gst_gsmenc_base_init (gpointer g_class)
{
  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);

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  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&gsmenc_sink_template));
  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&gsmenc_src_template));
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  gst_element_class_set_details (element_class, &gst_gsmenc_details);
}
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static void
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gst_gsmenc_class_init (GstGSMEnc * klass)
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{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;

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  gobject_class = (GObjectClass *) klass;
  gstelement_class = (GstElementClass *) klass;
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  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);

  gst_gsmenc_signals[FRAME_ENCODED] =
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      g_signal_new ("frame-encoded", G_TYPE_FROM_CLASS (klass),
      G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstGSMEncClass, frame_encoded), NULL,
      NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
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}


static void
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gst_gsmenc_init (GstGSMEnc * gsmenc)
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{
  /* create the sink and src pads */
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  gsmenc->sinkpad =
      gst_pad_new_from_template (gst_static_pad_template_get
      (&gsmenc_sink_template), "sink");
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  gst_element_add_pad (GST_ELEMENT (gsmenc), gsmenc->sinkpad);
  gst_pad_set_chain_function (gsmenc->sinkpad, gst_gsmenc_chain);
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  gst_pad_set_link_function (gsmenc->sinkpad, gst_gsmenc_sinkconnect);
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  gsmenc->srcpad =
      gst_pad_new_from_template (gst_static_pad_template_get
      (&gsmenc_src_template), "src");
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  gst_element_add_pad (GST_ELEMENT (gsmenc), gsmenc->srcpad);

  gsmenc->state = gsm_create ();
  gsmenc->bufsize = 0;
  gsmenc->next_ts = 0;
  gsmenc->rate = 8000;
}

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static GstPadLinkReturn
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gst_gsmenc_sinkconnect (GstPad * pad, const GstCaps * caps)
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{
  GstGSMEnc *gsmenc;
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  GstStructure *structure;
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  gsmenc = GST_GSMENC (gst_pad_get_parent (pad));

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  structure = gst_caps_get_structure (caps, 0);
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  gst_structure_get_int (structure, "rate", &gsmenc->rate);
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  if (gst_pad_try_set_caps (gsmenc->srcpad,
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          gst_caps_new_simple ("audio/x-gsm",
              "rate", G_TYPE_INT, gsmenc->rate,
              "channels", G_TYPE_INT, 1, NULL)) > 0) {
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    return GST_PAD_LINK_OK;
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  }
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  return GST_PAD_LINK_REFUSED;
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}

static void
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gst_gsmenc_chain (GstPad * pad, GstData * _data)
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{
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  GstBuffer *buf = GST_BUFFER (_data);
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  GstGSMEnc *gsmenc;
  gsm_signal *data;
  guint size;

  g_return_if_fail (pad != NULL);
  g_return_if_fail (GST_IS_PAD (pad));
  g_return_if_fail (buf != NULL);

  gsmenc = GST_GSMENC (GST_OBJECT_PARENT (pad));
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  data = (gsm_signal *) GST_BUFFER_DATA (buf);
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  size = GST_BUFFER_SIZE (buf) / sizeof (gsm_signal);

  if (gsmenc->bufsize && (gsmenc->bufsize + size >= 160)) {
    GstBuffer *outbuf;

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    memcpy (gsmenc->buffer + gsmenc->bufsize, data,
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        (160 - gsmenc->bufsize) * sizeof (gsm_signal));
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    outbuf = gst_buffer_new ();
    GST_BUFFER_DATA (outbuf) = g_malloc (33 * sizeof (gsm_byte));
    GST_BUFFER_SIZE (outbuf) = 33 * sizeof (gsm_byte);

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    gsm_encode (gsmenc->state, gsmenc->buffer,
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        (gsm_byte *) GST_BUFFER_DATA (outbuf));
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    GST_BUFFER_TIMESTAMP (outbuf) = gsmenc->next_ts;
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    gst_pad_push (gsmenc->srcpad, GST_DATA (outbuf));
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    gsmenc->next_ts += (160.0 / gsmenc->rate) * 1000000;

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    size -= (160 - gsmenc->bufsize);
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    data += (160 - gsmenc->bufsize);
    gsmenc->bufsize = 0;
  }

  while (size >= 160) {
    GstBuffer *outbuf;

    outbuf = gst_buffer_new ();
    GST_BUFFER_DATA (outbuf) = g_malloc (33 * sizeof (gsm_byte));
    GST_BUFFER_SIZE (outbuf) = 33 * sizeof (gsm_byte);

    gsm_encode (gsmenc->state, data, (gsm_byte *) GST_BUFFER_DATA (outbuf));

    GST_BUFFER_TIMESTAMP (outbuf) = gsmenc->next_ts;
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    gst_pad_push (gsmenc->srcpad, GST_DATA (outbuf));
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    gsmenc->next_ts += (160 / gsmenc->rate) * GST_SECOND;
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    size -= 160;
    data += 160;
  }

  if (size) {
    memcpy (gsmenc->buffer + gsmenc->bufsize, data, size * sizeof (gsm_signal));
    gsmenc->bufsize += size;
  }

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  gst_buffer_unref (buf);
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}