gstreamer/ext/gsm/gstgsmenc.c

/* GStreamer
 * 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.
 */


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

#include "gstgsmenc.h"

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

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

enum
{
  ARG_0
      /* FILL ME */
};

static void gst_gsmenc_base_init (gpointer g_class);
static void gst_gsmenc_class_init (GstGSMEnc * klass);
static void gst_gsmenc_init (GstGSMEnc * gsmenc);

static GstFlowReturn gst_gsmenc_chain (GstPad * pad, GstBuffer * buf);

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),
      gst_gsmenc_base_init,
      NULL,
      (GClassInitFunc) gst_gsmenc_class_init,
      NULL,
      NULL,
      sizeof (GstGSMEnc),
      0,
      (GInstanceInitFunc) gst_gsmenc_init,
    };

    gsmenc_type =
        g_type_register_static (GST_TYPE_ELEMENT, "GstGSMEnc", &gsmenc_info, 0);
  }
  return gsmenc_type;
}

static GstStaticPadTemplate gsmenc_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
    GST_PAD_SRC,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("audio/x-gsm, " "rate = (int) 8000, " "channels = (int) 1")
    );

static GstStaticPadTemplate gsmenc_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
    GST_PAD_SINK,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("audio/x-raw-int, "
        "endianness = (int) BYTE_ORDER, "
        "signed = (boolean) true, "
        "width = (int) 16, "
        "depth = (int) 16, " "rate = (int) 8000, " "channels = (int) 1")
    );

static void
gst_gsmenc_base_init (gpointer g_class)
{
  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);

  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));
  gst_element_class_set_details (element_class, &gst_gsmenc_details);
}

static void
gst_gsmenc_class_init (GstGSMEnc * klass)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;

  gobject_class = (GObjectClass *) klass;
  gstelement_class = (GstElementClass *) klass;

  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);

  gst_gsmenc_signals[FRAME_ENCODED] =
      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);
}


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

  gsmenc->srcpad =
      gst_pad_new_from_template (gst_static_pad_template_get
      (&gsmenc_src_template), "src");
  gst_element_add_pad (GST_ELEMENT (gsmenc), gsmenc->srcpad);

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

static GstFlowReturn
gst_gsmenc_chain (GstPad * pad, GstBuffer * buf)
{
  GstGSMEnc *gsmenc;

  gsmenc = GST_GSMENC (GST_OBJECT_PARENT (pad));

  if (GST_IS_EVENT (buf)) {
    GstEvent *event = GST_EVENT (buf);

    switch (GST_EVENT_TYPE (event)) {
      case GST_EVENT_EOS:{
        gst_pad_push_event (gsmenc->srcpad, gst_event_new_eos ());
        gst_pad_push (gsmenc->srcpad, buf);
        break;
      }
      case GST_EVENT_NEWSEGMENT:{
        /* drop the discontinuity */
        break;
      }
      default:{
        gst_pad_event_default (pad, event);
        break;
      }
    }
    return GST_FLOW_OK;
  } else if (GST_IS_BUFFER (buf)) {
    gsm_signal *data;
    guint size;
    GstCaps *tempcaps = NULL;

    data = (gsm_signal *) GST_BUFFER_DATA (buf);
    size = GST_BUFFER_SIZE (buf) / sizeof (gsm_signal);

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

      memcpy (gsmenc->buffer + gsmenc->bufsize, data,
          (160 - gsmenc->bufsize) * sizeof (gsm_signal));

      outbuf = gst_buffer_new_and_alloc (33 * sizeof (gsm_byte));
      GST_BUFFER_TIMESTAMP (outbuf) = gsmenc->next_ts;
      GST_BUFFER_DURATION (outbuf) = 20 * GST_MSECOND;
      gsmenc->next_ts += 20 * GST_MSECOND;

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

      tempcaps = gst_caps_new_simple ("audio/x-gsm",
          "rate", G_TYPE_INT, 8000, "channels", G_TYPE_INT, 1, NULL);

      gst_buffer_set_caps (outbuf, tempcaps);
      gst_pad_push (gsmenc->srcpad, outbuf);

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

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

      outbuf = gst_buffer_new_and_alloc (33 * sizeof (gsm_byte));
      GST_BUFFER_TIMESTAMP (outbuf) = gsmenc->next_ts;
      GST_BUFFER_DURATION (outbuf) = 20 * GST_MSECOND;
      gsmenc->next_ts += 20 * GST_MSECOND;

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

      /* I was wondering that gst_buffer_set_caps (outbuf, GST_PAD_CAPS (gsmenc->srcpad)); 
       * could work, but it doens't work */

      tempcaps = gst_caps_new_simple ("audio/x-gsm",
          "rate", G_TYPE_INT, 8000, "channels", G_TYPE_INT, 1, NULL);

      gst_buffer_set_caps (outbuf, tempcaps);
      gst_pad_push (gsmenc->srcpad, outbuf);

      size -= 160;
      data += 160;
    }

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

    /*gst_buffer_unref (buf); */
    return GST_FLOW_OK;
  }
  return GST_FLOW_OK;
}