add missing files in previous commit (ASS encoder and decoder)

Originally committed as revision 25747 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 67 insertions, 0 deletions

diff --git a/libavcodec/assenc.c b/libavcodec/assenc.c
new file mode 100644
index 0000000000..c6f017ce5d
--- /dev/null
+++ b/libavcodec/assenc.c
@@ -0,0 +1,67 @@
+/*
+ * SSA/ASS encoder
+ * Copyright (c) 2010  Aurelien Jacobs <aurel@gnuage.org>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "avcodec.h"
+#include "libavutil/avstring.h"
+
+static av_cold int ass_encode_init(AVCodecContext *avctx)
+{
+    avctx->extradata = av_malloc(avctx->subtitle_header_size);
+    if (!avctx->extradata)
+        return AVERROR(ENOMEM);
+    memcpy(avctx->extradata, avctx->subtitle_header, avctx->subtitle_header_size);
+    avctx->extradata_size = avctx->subtitle_header_size;
+    return 0;
+}
+
+static int ass_encode_frame(AVCodecContext *avctx,
+                            unsigned char *buf, int bufsize, void *data)
+{
+    AVSubtitle *sub = data;
+    int i, len, total_len = 0;
+
+    for (i=0; i<sub->num_rects; i++) {
+        if (sub->rects[i]->type != SUBTITLE_ASS) {
+            av_log(avctx, AV_LOG_ERROR, "Only SUBTITLE_ASS type supported.\n");
+            return -1;
+        }
+
+        len = av_strlcpy(buf+total_len, sub->rects[i]->ass, bufsize-total_len);
+
+        if (len > bufsize-total_len-1) {
+            av_log(avctx, AV_LOG_ERROR, "Buffer too small for ASS event.\n");
+            return -1;
+        }
+
+        total_len += len;
+    }
+
+    return total_len;
+}
+
+AVCodec ass_encoder = {
+    .name         = "ass",
+    .long_name    = NULL_IF_CONFIG_SMALL("Advanced SubStation Alpha subtitle"),
+    .type         = AVMEDIA_TYPE_SUBTITLE,
+    .id           = CODEC_ID_SSA,
+    .init         = ass_encode_init,
+    .encode       = ass_encode_frame,
+};