Universal Text Subtitle Support Initial Implementation

- Patch by davidfstr ... Thanks!
- Adds support for reading TEXT subtitle tracks from file inputs
- Tested combinations:
-- MKV UTF-8 -> MKV UTF-8 (passthru)
-- MKV UTF-8 -> MP4 TX3G (upconvert)
-- MP4 TX3G -> MKV UTF-8 (downconvert)
-- MP4 TX3G -> MP4 TX3G (downconvert to UTF-8 then upconvert)
- Further explained here http://forum.handbrake.fr/viewtopic.php?f=4&t=16099 

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@3283 b64f7644-9d1e-0410-96f1-a4d463321fa5

1 files changed, 64 insertions, 0 deletions

diff --git a/libhb/decutf8sub.c b/libhb/decutf8sub.c
new file mode 100644
index 000000000..dcd05d4fc
--- /dev/null
+++ b/libhb/decutf8sub.c
@@ -0,0 +1,64 @@
+/* 
+   This file is part of the HandBrake source code.
+   Homepage: <http://handbrake.fr/>.
+   It may be used under the terms of the GNU General Public License. */
+
+/*
+ * Decoder for UTF-8 subtitles obtained from file input-sources.
+ * 
+ * Input and output packet format is UTF-8 encoded text,
+ * with limited HTML-style markup (only <b>, <i>, and <u>).
+ * 
+ * @author David Foster (davidfstr)
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include "hb.h"
+
+static int decutf8Init( hb_work_object_t * w, hb_job_t * job )
+{
+    return 0;
+}
+
+static int decutf8Work( hb_work_object_t * w, hb_buffer_t ** buf_in,
+                        hb_buffer_t ** buf_out )
+{
+    hb_buffer_t * in = *buf_in;
+    hb_buffer_t * out = NULL;
+
+    // Pass the packets through without modification
+    out = in;
+
+    // Warn if the subtitle's duration has not been passed through by the demuxer,
+    // which will prevent the subtitle from displaying at all
+    if ( out->stop == 0 ) {
+        hb_log( "decutf8sub: subtitle packet lacks duration" );
+    }
+    
+    // We shouldn't be storing the extra NULL character,
+    // but the MP4 muxer expects this, unfortunately.
+    if ( out->size > 0 && out->data[out->size - 1] != '\0' ) {
+        // NOTE: out->size remains unchanged
+        hb_buffer_realloc( out, out->size + 1 );
+        out->data[out->size] = '\0';
+    }
+    
+    *buf_in = NULL;
+    *buf_out = out;
+    return HB_WORK_OK;
+}
+
+static void decutf8Close( hb_work_object_t * w )
+{
+    // nothing
+}
+
+hb_work_object_t hb_decutf8sub =
+{
+    WORK_DECUTF8SUB,
+    "UTF-8 Subtitle Decoder",
+    decutf8Init,
+    decutf8Work,
+    decutf8Close
+};