gstreamer/ext/flac/gstflacenc.c

/* Gnome-Streamer
 * 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.
 */


#include <stdlib.h>
#include <string.h>

#include <gstflacenc.h>

extern GstPadTemplate *enc_src_template, *enc_sink_template;

/* elementfactory information */
GstElementDetails flacenc_details = {
  "FLAC encoder",
  "Filter/Audio/Encoder",
  "Encodes audio with the FLAC lossless audio encoder",
  VERSION,
  "Wim Taymans <wim.taymans@chello.be>",
  "(C) 2001",
};

/* FlacEnc signals and args */
enum {
  /* FILL ME */
  LAST_SIGNAL
};

enum {
  ARG_0,
};

static void	gst_flacenc_init		(FlacEnc *flacenc);
static void	gst_flacenc_class_init		(FlacEncClass *klass);

static void	gst_flacenc_chain		(GstPad *pad, GstBuffer *buf);

static void     gst_flacenc_set_property        (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
static void     gst_flacenc_get_property        (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);

static FLAC__StreamEncoderWriteStatus 
		gst_flacenc_write_callback 	(const FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], unsigned bytes, 
			    			 unsigned samples, unsigned current_frame, void *client_data);
static void 	gst_flacenc_metadata_callback 	(const FLAC__StreamEncoder *encoder, const FLAC__StreamMetaData *metadata, 
						 void *client_data);

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

GType
flacenc_get_type (void)
{
  static GType flacenc_type = 0;

  if (!flacenc_type) {
    static const GTypeInfo flacenc_info = {
      sizeof(FlacEncClass),
      NULL,
      NULL,
      (GClassInitFunc)gst_flacenc_class_init,
      NULL,
      NULL,
      sizeof(FlacEnc),
      0,
      (GInstanceInitFunc)gst_flacenc_init,
    };
    flacenc_type = g_type_register_static (GST_TYPE_ELEMENT, "FlacEnc", &flacenc_info, 0);
  }
  return flacenc_type;
}

static void
gst_flacenc_class_init (FlacEncClass *klass)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;

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

  parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
  
  // we have no properties atm so this is a bit silly
  gobject_class->set_property = gst_flacenc_set_property;
  gobject_class->get_property = gst_flacenc_get_property;
}

static void
gst_flacenc_newcaps (GstPad *pad, GstCaps *caps)
{
  FlacEnc *flacenc;

  flacenc = GST_FLACENC (gst_pad_get_parent (pad));

  flacenc->channels = gst_caps_get_int (caps, "channels");
  flacenc->depth = gst_caps_get_int (caps, "depth");
  flacenc->sample_rate = gst_caps_get_int (caps, "rate");

  FLAC__stream_encoder_set_bits_per_sample (flacenc->encoder, flacenc->depth);
  FLAC__stream_encoder_set_sample_rate (flacenc->encoder, flacenc->sample_rate);
  FLAC__stream_encoder_set_channels (flacenc->encoder, flacenc->channels);
}

static void
gst_flacenc_init (FlacEnc *flacenc)
{
  flacenc->sinkpad = gst_pad_new_from_template (enc_sink_template, "sink");
  gst_element_add_pad(GST_ELEMENT(flacenc),flacenc->sinkpad);
  gst_pad_set_chain_function(flacenc->sinkpad,gst_flacenc_chain);
  gst_pad_set_newcaps_function (flacenc->sinkpad, gst_flacenc_newcaps);

  flacenc->srcpad = gst_pad_new_from_template (enc_src_template, "src");
  gst_pad_set_caps (flacenc->srcpad, gst_pad_get_padtemplate_caps (flacenc->srcpad));
  gst_element_add_pad(GST_ELEMENT(flacenc),flacenc->srcpad);

  flacenc->encoder = FLAC__stream_encoder_new();
  FLAC__stream_encoder_set_write_callback (flacenc->encoder, gst_flacenc_write_callback);
  FLAC__stream_encoder_set_metadata_callback (flacenc->encoder, gst_flacenc_metadata_callback);
  FLAC__stream_encoder_set_client_data (flacenc->encoder, flacenc);
}

static FLAC__StreamEncoderWriteStatus 
gst_flacenc_write_callback (const FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], unsigned bytes, 
			    unsigned samples, unsigned current_frame, void *client_data)
{
  FlacEnc *flacenc;
  GstBuffer *outbuf;

  flacenc = GST_FLACENC (client_data);

  outbuf = gst_buffer_new ();
  GST_BUFFER_SIZE (outbuf) = bytes;
  GST_BUFFER_DATA (outbuf) = g_malloc (bytes);

  memcpy (GST_BUFFER_DATA (outbuf), buffer, bytes);

  gst_pad_push (flacenc->srcpad, outbuf);

  return FLAC__STREAM_ENCODER_WRITE_OK;
}

static void 
gst_flacenc_metadata_callback (const FLAC__StreamEncoder *encoder, const FLAC__StreamMetaData *metadata, void *client_data)
{
}

static void
gst_flacenc_chain (GstPad *pad,GstBuffer *buf)
{
  FlacEnc *flacenc;
  gint32 *data[FLAC__MAX_CHANNELS];
  gulong insize;
  gint samples, channels, depth;
  gulong i, j;
  gboolean res;

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

  flacenc = GST_FLACENC (gst_pad_get_parent (pad));

  channels = flacenc->channels;
  depth = flacenc->depth;

  insize = GST_BUFFER_SIZE (buf);
  samples = insize / channels / ((depth+7)>>3);

  if (FLAC__stream_encoder_get_state (flacenc->encoder) == FLAC__STREAM_ENCODER_UNINITIALIZED) {
    FLAC__StreamEncoderState state;

    state = FLAC__stream_encoder_init (flacenc->encoder);
    
    g_assert (state == FLAC__STREAM_ENCODER_OK);
  }

  for (i=0; i<channels; i++) {
    data[i] = g_malloc (samples * sizeof (gint32));
  }
    
  if (depth == 8) {
    gint8 *indata = (gint8 *) GST_BUFFER_DATA (buf);
    for (j=0; j<samples; j++) {
      for (i=0; i<channels; i++) {
        data[i][j] = (gint32) *indata++;
      }
    }
  }
  else if (depth == 16) {
    gint16 *indata = (gint16 *) GST_BUFFER_DATA (buf);
    for (j=0; j<samples; j++) {
      for (i=0; i<channels; i++) {
        data[i][j] = (gint32) *indata++;
      }
    }
  }

  res = FLAC__stream_encoder_process (flacenc->encoder, (const FLAC__int32 **)data, samples);

  for (i=0; i<channels; i++) {
    g_free (data[i]);
  }

  gst_buffer_unref(buf);
}

static void
gst_flacenc_set_property(GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
  FlacEnc *this;
  
  this = (FlacEnc *)object;
  switch (prop_id) {
  default:
    GST_DEBUG(0, "Unknown arg %d\n", prop_id);
    return;
  }
}

static void
gst_flacenc_get_property(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
  FlacEnc *this;
  
  this = (FlacEnc *)object;
  
  switch (prop_id) {
  default:
    GST_DEBUG(0, "Unknown arg %d\n", prop_id);
    break;
  }
}