Initial revision

Original commit message from CVS:
Initial revision

gst/ac3parse/.gitignore

@@ -0,0 +1,7 @@
+Makefile
+Makefile.in
+*.o
+*.lo
+*.la
+.deps
+.libs

gst/ac3parse/Makefile.am

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+filterdir = $(libdir)/gst
+
+filter_LTLIBRARIES = libgstac3parse.la
+
+libgstac3parse_la_SOURCES = gstac3parse.c
+
+noinst_HEADERS = gstac3parse.h
+
+libac3parse_la_CFLAGS = -O3 $(FOMIT_FRAME_POINTER) -funroll-all-loops -finline-functions -ffast-math $(GST_CFLAGS)
+
+EXTRA_DIST = README

gst/ac3parse/README

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+AC3 Audio Parser
+================
+
+This element parses out ac3 audio data.  It's based heavily on the
+mp3parse element, with some minor changes to calculate frame sizes for ac3
+instead of mp3.
+
+It will take an mpeg audio stream in any form on its 'src' input, with any
+buffer size, and split it into buffers containing a single frame each.
+NOTE: ancillary data is not dealt with right now.

gst/ac3parse/gstac3parse.c

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+/* 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.
+ */
+
+
+#define PCM_BUFFER_SIZE		(1152*4)
+
+/*#define DEBUG_ENABLED*/
+#include <gstac3parse.h>
+
+/* struct and table stolen from ac3dec by Aaron Holtzman */
+struct frmsize_s {
+  guint16 bit_rate;
+  guint16 frm_size[3];
+};
+
+static struct frmsize_s frmsizecod_tbl[] = {
+      { 32  ,{64   ,69   ,96   } },
+      { 32  ,{64   ,70   ,96   } },
+      { 40  ,{80   ,87   ,120  } },
+      { 40  ,{80   ,88   ,120  } },
+      { 48  ,{96   ,104  ,144  } },
+      { 48  ,{96   ,105  ,144  } },
+      { 56  ,{112  ,121  ,168  } },
+      { 56  ,{112  ,122  ,168  } },
+      { 64  ,{128  ,139  ,192  } },
+      { 64  ,{128  ,140  ,192  } },
+      { 80  ,{160  ,174  ,240  } },
+      { 80  ,{160  ,175  ,240  } },
+      { 96  ,{192  ,208  ,288  } },
+      { 96  ,{192  ,209  ,288  } },
+      { 112 ,{224  ,243  ,336  } },
+      { 112 ,{224  ,244  ,336  } },
+      { 128 ,{256  ,278  ,384  } },
+      { 128 ,{256  ,279  ,384  } },
+      { 160 ,{320  ,348  ,480  } },
+      { 160 ,{320  ,349  ,480  } },
+      { 192 ,{384  ,417  ,576  } },
+      { 192 ,{384  ,418  ,576  } },
+      { 224 ,{448  ,487  ,672  } },
+      { 224 ,{448  ,488  ,672  } },
+      { 256 ,{512  ,557  ,768  } },
+      { 256 ,{512  ,558  ,768  } },
+      { 320 ,{640  ,696  ,960  } },
+      { 320 ,{640  ,697  ,960  } },
+      { 384 ,{768  ,835  ,1152 } },
+      { 384 ,{768  ,836  ,1152 } },
+      { 448 ,{896  ,975  ,1344 } },
+      { 448 ,{896  ,976  ,1344 } },
+      { 512 ,{1024 ,1114 ,1536 } },
+      { 512 ,{1024 ,1115 ,1536 } },
+      { 576 ,{1152 ,1253 ,1728 } },
+      { 576 ,{1152 ,1254 ,1728 } },
+      { 640 ,{1280 ,1393 ,1920 } },
+      { 640 ,{1280 ,1394 ,1920 } }};
+
+/* elementfactory information */
+static GstElementDetails ac3parse_details = {
+  "AC3 Parser",
+  "Filter/Parser/Audio",
+  "Parses and frames AC3 audio streams, provides seek",
+  VERSION,
+  "Erik Walthinsen <omega@cse.ogi.edu>",
+  "(C) 1999",
+};
+
+/* GstAc3Parse signals and args */
+enum {
+  /* FILL ME */
+  LAST_SIGNAL
+};
+
+enum {
+  ARG_0,
+  ARG_SKIP,
+  /* FILL ME */
+};
+
+static GstPadTemplate*
+src_factory (void) 
+{
+  return 
+    gst_padtemplate_new (
+  	"src",
+  	GST_PAD_SRC,
+  	GST_PAD_ALWAYS,
+  	gst_caps_new (
+  	  "ac3parse_src",
+    	  "audio/ac3",
+	  gst_props_new (
+    	    "framed",   GST_PROPS_BOOLEAN (TRUE),
+	    NULL)),
+	NULL);
+}
+
+static GstPadTemplate*
+sink_factory (void) 
+{
+  return 
+    gst_padtemplate_new (
+  	"sink",
+  	GST_PAD_SINK,
+  	GST_PAD_ALWAYS,
+  	gst_caps_new (
+  	  "ac3parse_sink",
+    	  "audio/ac3",
+	  gst_props_new (
+    	    "framed",   GST_PROPS_BOOLEAN (FALSE),
+	    NULL)),
+	NULL);
+}
+
+static void	gst_ac3parse_class_init	(GstAc3ParseClass *klass);
+static void	gst_ac3parse_init	(GstAc3Parse *ac3parse);
+
+static void	gst_ac3parse_chain	(GstPad *pad,GstBuffer *buf);
+
+static void	gst_ac3parse_set_property	(GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
+static void	gst_ac3parse_get_property	(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
+
+static GstPadTemplate *src_template, *sink_template;
+
+static GstElementClass *parent_class = NULL;
+/*static guint gst_ac3parse_signals[LAST_SIGNAL] = { 0 };*/
+
+GType
+ac3parse_get_type (void)
+{
+  static GType ac3parse_type = 0;
+
+  if (!ac3parse_type) {
+    static const GTypeInfo ac3parse_info = {
+      sizeof(GstAc3ParseClass),      NULL,
+      NULL,
+      (GClassInitFunc)gst_ac3parse_class_init,
+      NULL,
+      NULL,
+      sizeof(GstAc3Parse),
+      0,
+      (GInstanceInitFunc)gst_ac3parse_init,
+    };
+    ac3parse_type = g_type_register_static(GST_TYPE_ELEMENT, "GstAc3Parse", &ac3parse_info, 0);
+  }
+  return ac3parse_type;
+}
+
+static void
+gst_ac3parse_class_init (GstAc3ParseClass *klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+
+  gobject_class = (GObjectClass*)klass;
+  gstelement_class = (GstElementClass*)klass;
+
+  g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_SKIP,
+    g_param_spec_int("skip","skip","skip",
+                     G_MININT,G_MAXINT,0,G_PARAM_READWRITE)); /* CHECKME */
+
+  parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
+
+  gobject_class->set_property = gst_ac3parse_set_property;
+  gobject_class->get_property = gst_ac3parse_get_property;
+
+}
+
+static void
+gst_ac3parse_init (GstAc3Parse *ac3parse)
+{
+  ac3parse->sinkpad = gst_pad_new_from_template (sink_template, "sink");
+  gst_element_add_pad (GST_ELEMENT (ac3parse), ac3parse->sinkpad);
+  gst_pad_set_chain_function (ac3parse->sinkpad, gst_ac3parse_chain);
+
+  ac3parse->srcpad = gst_pad_new_from_template (src_template, "src");
+  gst_element_add_pad (GST_ELEMENT (ac3parse), ac3parse->srcpad);
+
+  ac3parse->partialbuf = NULL;
+  ac3parse->skip = 0;
+}
+
+static void
+gst_ac3parse_chain (GstPad *pad, GstBuffer *buf)
+{
+  GstAc3Parse *ac3parse;
+  guchar *data;
+  glong size,offset = 0;
+  unsigned short header;
+  GstBuffer *outbuf = NULL;
+  gint bpf;
+
+  g_return_if_fail(pad != NULL);
+  g_return_if_fail(GST_IS_PAD(pad));
+  g_return_if_fail(buf != NULL);
+/*  g_return_if_fail(GST_IS_BUFFER(buf)); */
+
+  ac3parse = GST_AC3PARSE(GST_OBJECT_PARENT (pad));
+  GST_DEBUG (0,"ac3parse: received buffer of %d bytes\n", GST_BUFFER_SIZE (buf));
+
+  /* deal with partial frame from previous buffer */
+  if (ac3parse->partialbuf) {
+
+    ac3parse->partialbuf = gst_buffer_append(ac3parse->partialbuf, buf);;
+    /* and the one we received.. */
+    gst_buffer_unref(buf);
+  }
+  else {
+    ac3parse->partialbuf = buf;
+  }
+
+  data = GST_BUFFER_DATA(ac3parse->partialbuf);
+  size = GST_BUFFER_SIZE(ac3parse->partialbuf);
+
+  /* while we still have bytes left -2 for the header */
+  while (offset < size-2) {
+    int skipped = 0;
+
+    GST_DEBUG (0,"ac3parse: offset %ld, size %ld \n",offset, size);
+
+    /* search for a possible start byte */
+    for (;((data[offset] != 0x0b) && (offset < size));offset++) skipped++ ;
+    if (skipped) {
+      fprintf(stderr, "ac3parse: **** now at %ld skipped %d bytes (FIXME?)\n",offset,skipped);
+    }
+    /* construct the header word */
+    header = GUINT16_TO_BE(*((guint16 *)(data+offset)));
+/*    g_print("AC3PARSE: sync word is 0x%02X\n",header); */
+    /* if it's a valid header, go ahead and send off the frame */
+    if (header == 0x0b77) {
+      gint rate, fsize;
+/*      g_print("AC3PARSE: found sync at %d\n",offset); */
+      /* get the bits we're interested in */
+      rate = (data[offset+4] >> 6) & 0x3;
+      fsize = data[offset+4] & 0x3f;
+      /* calculate the bpf of the frame */
+      bpf = frmsizecod_tbl[fsize].frm_size[rate] * 2;
+      /* if we don't have the whole frame... */
+      if ((size - offset) < bpf) {
+	GST_DEBUG (0,"ac3parse: partial buffer needed %ld < %d \n",size-offset, bpf);
+	break;
+      } else {
+	outbuf = gst_buffer_create_sub(ac3parse->partialbuf,offset,bpf);
+
+	offset += bpf;
+	if (ac3parse->skip == 0 && GST_PAD_CONNECTED(ac3parse->srcpad)) {
+	  GST_DEBUG (0,"ac3parse: pushing buffer of %d bytes\n",GST_BUFFER_SIZE(outbuf));
+          gst_pad_push(ac3parse->srcpad,outbuf);
+	}
+	else {
+	  GST_DEBUG (0,"ac3parse: skipping buffer of %d bytes\n",GST_BUFFER_SIZE(outbuf));
+          gst_buffer_unref(outbuf);
+	  ac3parse->skip--;
+	}
+      }
+    } else {
+      offset++;
+      fprintf(stderr, "ac3parse: *** wrong header, skipping byte (FIXME?)\n");
+    }
+  }
+  /* if we have processed this block and there are still */
+  /* bytes left not in a partial block, copy them over. */
+  if (size-offset > 0) {
+    gint remainder = (size - offset);
+    GST_DEBUG (0,"ac3parse: partial buffer needed %d for trailing bytes\n",remainder);
+
+    outbuf = gst_buffer_create_sub(ac3parse->partialbuf,offset,remainder);
+    gst_buffer_unref(ac3parse->partialbuf);
+    ac3parse->partialbuf = outbuf;
+  }
+}
+
+static void
+gst_ac3parse_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
+{
+  GstAc3Parse *src;
+
+  /* it's not null if we got it, but it might not be ours */
+  g_return_if_fail(GST_IS_AC3PARSE(object));
+  src = GST_AC3PARSE(object);
+
+  switch (prop_id) {
+    case ARG_SKIP:
+      src->skip = g_value_get_int (value);
+      break;
+    default:
+      break;
+  }
+}
+
+static void
+gst_ac3parse_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
+{
+  GstAc3Parse *src;
+
+  /* it's not null if we got it, but it might not be ours */
+  g_return_if_fail(GST_IS_AC3PARSE(object));
+  src = GST_AC3PARSE(object);
+
+  switch (prop_id) {
+    case ARG_SKIP:
+      g_value_set_int (value, src->skip);
+      break;
+    default:
+      break;
+  }
+}
+
+static gboolean
+plugin_init (GModule *module, GstPlugin *plugin)
+{
+  GstElementFactory *factory;
+
+  /* create an elementfactory for the ac3parse element */
+  factory = gst_elementfactory_new("ac3parse",GST_TYPE_AC3PARSE,
+                                   &ac3parse_details);
+  g_return_val_if_fail(factory != NULL, FALSE);
+
+  src_template = src_factory ();
+  gst_elementfactory_add_padtemplate (factory, src_template);
+
+  sink_template = sink_factory ();
+  gst_elementfactory_add_padtemplate (factory, sink_template);
+
+  gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
+
+  return TRUE;
+}
+
+GstPluginDesc plugin_desc = {
+  GST_VERSION_MAJOR,
+  GST_VERSION_MINOR,
+  "ac3parse",
+  plugin_init
+};

gst/ac3parse/gstac3parse.h

@@ -0,0 +1,71 @@
+/* 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.
+ */
+
+
+#ifndef __AC3PARSE_H__
+#define __AC3PARSE_H__
+
+
+#include <config.h>
+#include <gst/gst.h>
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+
+#define GST_TYPE_AC3PARSE \
+  (ac3parse_get_type())
+#define GST_AC3PARSE(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AC3PARSE,GstAc3Parse))
+#define GST_AC3PARSE_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_AC3PARSE,GstAc3Parse))
+#define GST_IS_AC3PARSE(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AC3PARSE))
+#define GST_IS_AC3PARSE_CLASS(obj) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_AC3PARSE)))
+
+typedef struct _GstAc3Parse GstAc3Parse;
+typedef struct _GstAc3ParseClass GstAc3ParseClass;
+
+struct _GstAc3Parse {
+  GstElement element;
+
+  GstPad *sinkpad,*srcpad;
+
+  GstBuffer *partialbuf;	/* previous buffer (if carryover) */
+  guint lastframebytes;		/* bytes in previous of last frame so far */
+  guint lastframesize;		/* total length of last frame */
+  guint skip; /* number of frames to skip */
+};
+
+struct _GstAc3ParseClass {
+  GstElementClass parent_class;
+};
+
+GType gst_ac3parse_get_type(void);
+
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+
+#endif /* __AC3PARSE_H__ */