adding flac

Original commit message from CVS:
adding flac

ext/flac/Makefile.am

@@ -0,0 +1,10 @@
+plugindir = $(libdir)/gst
+
+plugin_LTLIBRARIES = libgstflac.la
+
+libgstflac_la_SOURCES = gstflac.c gstflacenc.c gstflacdec.c
+
+noinst_HEADERS = gstflacenc.h gstflacdec.h
+
+libgstflac_la_CFLAGS = $(GST_CFLAGS)
+libgstflac_la_LIBADD = $(GST_LIBS) 

ext/flac/gstflacenc.c

@@ -0,0 +1,249 @@
+/* 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 <gst/gstarch.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;
+  }
+}
+