gst/mxf/: Add support for A-Law encoded audio essence (SMPTE 388M and 382M).

Original commit message from CVS:
* gst/mxf/Makefile.am:
* gst/mxf/mxfaes-bwf.c: (mxf_bwf_create_caps):
* gst/mxf/mxfalaw.c: (mxf_is_alaw_audio_essence_track),
(mxf_alaw_handle_essence_element), (mxf_alaw_create_caps):
* gst/mxf/mxfalaw.h:
* gst/mxf/mxfdemux.c:
(gst_mxf_demux_handle_header_metadata_update_streams):
Add support for A-Law encoded audio essence (SMPTE 388M and 382M).

ChangeLog

@@ -1,3 +1,14 @@
+2008-11-28  Sebastian Dröge  <sebastian.droege@collabora.co.uk>
+
+	* gst/mxf/Makefile.am:
+	* gst/mxf/mxfaes-bwf.c: (mxf_bwf_create_caps):
+	* gst/mxf/mxfalaw.c: (mxf_is_alaw_audio_essence_track),
+	(mxf_alaw_handle_essence_element), (mxf_alaw_create_caps):
+	* gst/mxf/mxfalaw.h:
+	* gst/mxf/mxfdemux.c:
+	(gst_mxf_demux_handle_header_metadata_update_streams):
+	Add support for A-Law encoded audio essence (SMPTE 388M and 382M).
+
 2008-11-28  Sebastian Dröge  <sebastian.droege@collabora.co.uk>
 
 	* gst/mxf/mxfdemux.c: (gst_mxf_demux_reset),

gst/mxf/Makefile.am

@@ -6,7 +6,8 @@ libgstmxf_la_SOURCES = \
 	mxfparse.c \
 	mxfaes-bwf.c \
 	mxfmpeg.c \
-	mxfdv-dif.c
+	mxfdv-dif.c \
+	mxfalaw.c
 
 libgstmxf_la_CFLAGS = $(GST_CFLAGS) $(GST_BASE_CFLAGS)
 libgstmxf_la_LIBADD = $(GST_LIBS) $(GST_BASE_LIBS)
@@ -18,5 +19,6 @@ noinst_HEADERS = \
 	mxfaes-bwf.h \
 	mxfmpeg.h \
 	mxfdv-dif.h \
+	mxfalaw.h \
 	mxftypes.h
 

gst/mxf/mxfaes-bwf.c

@@ -244,6 +244,11 @@ static const MXFUL mxf_sound_essence_compression_aiff =
     0x7E, 0x00, 0x00, 0x00}
 };
 
+static const MXFUL mxf_sound_essence_compression_alaw =
+    { {0x06, 0x0E, 0x2B, 0x34, 0x04, 0x01, 0x01, 0x03, 0x04, 0x02, 0x02, 0x02,
+    0x03, 0x01, 0x01, 0x00}
+};
+
 static GstCaps *
 mxf_bwf_create_caps (MXFMetadataGenericPackage * package,
     MXFMetadataTrack * track,
@@ -313,6 +318,19 @@ mxf_bwf_create_caps (MXFMetadataGenericPackage * package,
         (block_align != 1), "endianness", G_TYPE_INT, G_BIG_ENDIAN, "depth",
         G_TYPE_INT, (block_align / descriptor->channel_count) * 8, "width",
         G_TYPE_INT, (block_align / descriptor->channel_count) * 8, NULL);
+  } else if (mxf_ul_is_equal (&descriptor->sound_essence_compression,
+          &mxf_sound_essence_compression_alaw)) {
+
+    if (descriptor->audio_sampling_rate.n != 0 ||
+        descriptor->audio_sampling_rate.d != 0 ||
+        descriptor->channel_count != 0) {
+      GST_ERROR ("Invalid descriptor");
+      return NULL;
+    }
+    ret = gst_caps_new_simple ("audio/x-alaw", "rate", G_TYPE_INT,
+        (gint) (((gdouble) descriptor->audio_sampling_rate.n) /
+            ((gdouble) descriptor->audio_sampling_rate.d) + 0.5),
+        "channels", G_TYPE_INT, descriptor->channel_count);
   } else {
     GST_ERROR ("Unsupported sound essence compression: %s",
         mxf_ul_to_string (&descriptor->sound_essence_compression, str));

gst/mxf/mxfalaw.c

@@ -0,0 +1,134 @@
+/* GStreamer
+ * Copyright (C) 2008 Sebastian Dröge <sebastian.droege@collabora.co.uk>
+ *
+ * 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.
+ */
+
+/* Implementation of SMPTE 388M - Mapping A-Law coded audio into the MXF
+ * Generic Container
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gst/gst.h>
+#include <string.h>
+
+#include "mxfalaw.h"
+
+GST_DEBUG_CATEGORY_EXTERN (mxf_debug);
+#define GST_CAT_DEFAULT mxf_debug
+
+gboolean
+mxf_is_alaw_audio_essence_track (const MXFMetadataTrack * track)
+{
+  guint i;
+
+  g_return_val_if_fail (track != NULL, FALSE);
+
+  if (track->descriptor == NULL)
+    return FALSE;
+
+  for (i = 0; i < track->n_descriptor; i++) {
+    MXFMetadataFileDescriptor *d = track->descriptor[i];
+    MXFUL *key = &d->essence_container;
+    /* SMPTE 388M 6.1 */
+    if (mxf_is_generic_container_essence_container_label (key) &&
+        key->u[12] == 0x02 && key->u[13] == 0x0a &&
+        (key->u[14] == 0x01 || key->u[14] == 0x02 || key->u[14] == 0x03))
+      return TRUE;
+  }
+
+  return FALSE;
+}
+
+static GstFlowReturn
+mxf_alaw_handle_essence_element (const MXFUL * key, GstBuffer * buffer,
+    GstCaps * caps, MXFMetadataGenericPackage * package,
+    MXFMetadataTrack * track, MXFMetadataStructuralComponent * component,
+    gpointer mapping_data, GstBuffer ** outbuf)
+{
+  *outbuf = buffer;
+
+  /* SMPTE 388M 5.1 */
+  if (key->u[12] != 0x16 || (key->u[14] != 0x08 && key->u[14] != 0x09
+          && key->u[14] != 0x0a)) {
+    GST_ERROR ("Invalid A-Law essence element");
+    return GST_FLOW_ERROR;
+  }
+
+  return GST_FLOW_OK;
+}
+
+
+GstCaps *
+mxf_alaw_create_caps (MXFMetadataGenericPackage * package,
+    MXFMetadataTrack * track, GstTagList ** tags,
+    MXFEssenceElementHandler * handler, gpointer * mapping_data)
+{
+  MXFMetadataFileDescriptor *f = NULL;
+  MXFMetadataGenericSoundEssenceDescriptor *s = NULL;
+  guint i;
+  GstCaps *caps = NULL;
+
+  g_return_val_if_fail (package != NULL, NULL);
+  g_return_val_if_fail (track != NULL, NULL);
+
+  if (track->descriptor == NULL) {
+    GST_ERROR ("No descriptor found for this track");
+    return NULL;
+  }
+
+  for (i = 0; i < track->n_descriptor; i++) {
+    if (((MXFMetadataGenericDescriptor *) track->descriptor[i])->type ==
+        MXF_METADATA_GENERIC_SOUND_ESSENCE_DESCRIPTOR) {
+      s = (MXFMetadataGenericSoundEssenceDescriptor *) track->descriptor[i];
+      f = track->descriptor[i];
+      break;
+    } else if (((MXFMetadataGenericDescriptor *) track->
+            descriptor[i])->is_file_descriptor
+        && ((MXFMetadataGenericDescriptor *) track->descriptor[i])->type !=
+        MXF_METADATA_MULTIPLE_DESCRIPTOR) {
+      f = track->descriptor[i];
+    }
+  }
+
+  if (!f) {
+    GST_ERROR ("No descriptor found for this track");
+    return NULL;
+  }
+
+  *handler = mxf_alaw_handle_essence_element;
+
+  caps = gst_caps_new_simple ("audio/x-alaw", NULL);
+  if (s) {
+    if (s->audio_sampling_rate.n != 0 && s->audio_sampling_rate.d != 0)
+      gst_caps_set_simple (caps, "rate", G_TYPE_INT,
+          (gint) (((gdouble) s->audio_sampling_rate.n) /
+              ((gdouble) s->audio_sampling_rate.d) + 0.5), NULL);
+
+    if (s->channel_count != 0)
+      gst_caps_set_simple (caps, "channels", G_TYPE_INT, s->channel_count,
+          NULL);
+
+    /* TODO: Handle channel layout somehow? */
+  } else {
+    GST_WARNING ("Only a generic sound essence descriptor found");
+  }
+
+  return caps;
+}

gst/mxf/mxfalaw.h

@@ -0,0 +1,36 @@
+/* GStreamer
+ * Copyright (C) 2008 Sebastian Dröge <sebastian.droege@collabora.co.uk>
+ *
+ * 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.
+ */
+
+/* Implementation of SMPTE 388M - Mapping A-Law coded audio into the MXF
+ * Generic Container
+ */
+
+#ifndef __MXF_ALAW_H__
+#define __MXF_ALAW_H__
+
+#include <gst/gst.h>
+
+#include "mxfparse.h"
+
+gboolean mxf_is_alaw_audio_essence_track (const MXFMetadataTrack *track);
+
+GstCaps *
+mxf_alaw_create_caps (MXFMetadataGenericPackage *package, MXFMetadataTrack *track, GstTagList **tags, MXFEssenceElementHandler *handler, gpointer *mapping_data);
+
+#endif /* __MXF_ALAW_H__ */

gst/mxf/mxfdemux.c

@@ -34,6 +34,7 @@
 #include "mxfaes-bwf.h"
 #include "mxfmpeg.h"
 #include "mxfdv-dif.h"
+#include "mxfalaw.h"
 
 #include <string.h>
 
@@ -1291,8 +1292,9 @@ gst_mxf_demux_handle_header_metadata_resolve_references (GstMXFDemux * demux)
           MXFMetadataEssenceContainerData, i);
 
       for (j = 0; j < demux->content_storage.n_essence_container_data; j++) {
-        if (mxf_ul_is_equal (&demux->content_storage.
-                essence_container_data_uids[j], &data->instance_uid)) {
+        if (mxf_ul_is_equal (&demux->
+                content_storage.essence_container_data_uids[j],
+                &data->instance_uid)) {
           demux->content_storage.essence_container_data[j] = data;
           break;
         }
@@ -1842,6 +1844,10 @@ choose_package:
           caps =
               mxf_dv_dif_create_caps (source_package, source_track,
               &pad->tags, &pad->handle_essence_element, &pad->mapping_data);
+        else if (mxf_is_alaw_audio_essence_track (source_track))
+          caps =
+              mxf_alaw_create_caps (source_package, source_track,
+              &pad->tags, &pad->handle_essence_element, &pad->mapping_data);
         break;
       case MXF_METADATA_TRACK_DATA_ESSENCE:
         if (mxf_is_dv_dif_essence_track (source_track))