gstreamer/ext/speex/gstspeexenc.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 "gstspeexenc.h"

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

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

enum
{
  ARG_0,
  /* FILL ME */
};

static void gst_speexenc_base_init (gpointer g_class);
static void gst_speexenc_class_init (GstSpeexEnc * klass);
static void gst_speexenc_init (GstSpeexEnc * speexenc);

static void gst_speexenc_chain (GstPad * pad, GstData * _data);
static GstPadLinkReturn gst_speexenc_sinkconnect (GstPad * pad,
    const GstCaps * caps);

static GstElementClass *parent_class = NULL;
static guint gst_speexenc_signals[LAST_SIGNAL] = { 0 };

GType
gst_speexenc_get_type (void)
{
  static GType speexenc_type = 0;

  if (!speexenc_type) {
    static const GTypeInfo speexenc_info = {
      sizeof (GstSpeexEncClass),
      gst_speexenc_base_init,
      NULL,
      (GClassInitFunc) gst_speexenc_class_init,
      NULL,
      NULL,
      sizeof (GstSpeexEnc),
      0,
      (GInstanceInitFunc) gst_speexenc_init,
    };

    speexenc_type =
        g_type_register_static (GST_TYPE_ELEMENT, "GstSpeexEnc", &speexenc_info,
        0);
  }
  return speexenc_type;
}

static GstStaticPadTemplate speexenc_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) [ 1000, 48000 ], " "channels = (int) 1")
    );

static GstStaticPadTemplate speexenc_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
    GST_PAD_SRC,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("audio/x-speex, "
        "rate = (int) [ 1000, 48000 ], " "channels = (int) 1")
    );

static void
gst_speexenc_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 (&speexenc_sink_template));
  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&speexenc_src_template));

  gst_element_class_set_details (element_class, &gst_speexenc_details);
}

static void
gst_speexenc_class_init (GstSpeexEnc * 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_speexenc_signals[FRAME_ENCODED] =
      g_signal_new ("frame-encoded", G_TYPE_FROM_CLASS (klass),
      G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstSpeexEncClass, frame_encoded),
      NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
}


static void
gst_speexenc_init (GstSpeexEnc * speexenc)
{
  /* create the sink and src pads */
  speexenc->sinkpad =
      gst_pad_new_from_template (gst_static_pad_template_get
      (&speexenc_sink_template), "sink");
  gst_element_add_pad (GST_ELEMENT (speexenc), speexenc->sinkpad);
  gst_pad_set_chain_function (speexenc->sinkpad, gst_speexenc_chain);
  gst_pad_set_link_function (speexenc->sinkpad, gst_speexenc_sinkconnect);

  speexenc->srcpad =
      gst_pad_new_from_template (gst_static_pad_template_get
      (&speexenc_src_template), "src");
  gst_element_add_pad (GST_ELEMENT (speexenc), speexenc->srcpad);

  speex_bits_init (&speexenc->bits);
  speexenc->mode = &speex_nb_mode;
  speexenc->bufsize = 0;
  speexenc->packet_count = 0;
  speexenc->n_packets = 20;
}

static GstPadLinkReturn
gst_speexenc_sinkconnect (GstPad * pad, const GstCaps * caps)
{
  GstSpeexEnc *speexenc;
  GstStructure *structure;

  speexenc = GST_SPEEXENC (gst_pad_get_parent (pad));

  structure = gst_caps_get_structure (caps, 0);
  gst_structure_get_int (structure, "rate", &speexenc->rate);
  if (gst_pad_try_set_caps (speexenc->srcpad,
          gst_caps_new_simple ("audio/x-speex",
              "rate", G_TYPE_INT, speexenc->rate,
              "channels", G_TYPE_INT, 1, NULL))) {
    speex_init_header (&speexenc->header, speexenc->rate, 1, speexenc->mode);
    speexenc->header.frames_per_packet = speexenc->n_packets;

    speexenc->state = speex_encoder_init (speexenc->mode);
    speex_encoder_ctl (speexenc->state, SPEEX_GET_FRAME_SIZE,
        &speexenc->frame_size);

    return GST_PAD_LINK_OK;
  }
  return GST_PAD_LINK_REFUSED;

}

static void
gst_speexenc_chain (GstPad * pad, GstData * _data)
{
  GstBuffer *buf = GST_BUFFER (_data);
  GstSpeexEnc *speexenc;
  GstBuffer *outbuf;
  gint16 *data;
  guint8 *header_data;
  gint size;
  float input[1000];
  gint frame_size;
  gint i;

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

  speexenc = GST_SPEEXENC (GST_OBJECT_PARENT (pad));

  if (!GST_PAD_CAPS (speexenc->srcpad)) {

    if (!gst_pad_try_set_caps (speexenc->srcpad,
            gst_caps_new_simple ("audio/x-speex",
                "rate", G_TYPE_INT, speexenc->rate,
                "channels", G_TYPE_INT, 1, NULL))) {
      GST_ELEMENT_ERROR (speexenc, CORE, NEGOTIATION, (NULL), (NULL));
      return;
    }
  }

  if (speexenc->packet_count == 0) {
    header_data = speex_header_to_packet (&speexenc->header, &size);

    outbuf = gst_buffer_new ();
    GST_BUFFER_DATA (outbuf) = header_data;
    GST_BUFFER_SIZE (outbuf) = size;

    gst_pad_push (speexenc->srcpad, GST_DATA (outbuf));
  }

  data = (gint16 *) GST_BUFFER_DATA (buf);
  size = GST_BUFFER_SIZE (buf) / sizeof (gint16);

  frame_size = speexenc->frame_size;

  if (speexenc->bufsize && (speexenc->bufsize + size >= frame_size)) {
    memcpy (speexenc->buffer + speexenc->bufsize, data,
        (frame_size - speexenc->bufsize) * sizeof (gint16));

    for (i = 0; i < frame_size; i++)
      input[i] = speexenc->buffer[i];

    speex_encode (speexenc->state, input, &speexenc->bits);
    speexenc->packet_count++;

    if (speexenc->packet_count % speexenc->n_packets == 0) {
      GstBuffer *outbuf;

      outbuf = gst_buffer_new_and_alloc (frame_size * speexenc->n_packets);
      GST_BUFFER_SIZE (outbuf) = speex_bits_write (&speexenc->bits,
          GST_BUFFER_DATA (outbuf), GST_BUFFER_SIZE (outbuf));
      GST_BUFFER_TIMESTAMP (outbuf) = speexenc->next_ts;
      speex_bits_reset (&speexenc->bits);

      gst_pad_push (speexenc->srcpad, GST_DATA (outbuf));
      speexenc->next_ts += frame_size * GST_SECOND / speexenc->rate;
    }

    size -= (speexenc->frame_size - speexenc->bufsize);
    data += (speexenc->frame_size - speexenc->bufsize);

    speexenc->bufsize = 0;
  }

  while (size >= frame_size) {
    for (i = 0; i < frame_size; i++)
      input[i] = data[i];

    speex_encode (speexenc->state, input, &speexenc->bits);
    speexenc->packet_count++;

    if (speexenc->packet_count % speexenc->n_packets == 0) {
      GstBuffer *outbuf;

      outbuf = gst_buffer_new_and_alloc (frame_size * speexenc->n_packets);
      GST_BUFFER_SIZE (outbuf) = speex_bits_write (&speexenc->bits,
          GST_BUFFER_DATA (outbuf), GST_BUFFER_SIZE (outbuf));
      GST_BUFFER_TIMESTAMP (outbuf) = speexenc->next_ts;
      speex_bits_reset (&speexenc->bits);

      gst_pad_push (speexenc->srcpad, GST_DATA (outbuf));
      speexenc->next_ts += frame_size * GST_SECOND / speexenc->rate;
    }

    size -= frame_size;
    data += frame_size;
  }

  if (size) {
    memcpy (speexenc->buffer + speexenc->bufsize, data, size * sizeof (gint16));
    speexenc->bufsize += size;
  }

  gst_buffer_unref (buf);
}