1 files changed, 82 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/assdec.c b/ffmpeg/libavcodec/assdec.c
new file mode 100644
index 0000000..d790656
--- /dev/null
+++ b/ffmpeg/libavcodec/assdec.c
@@ -0,0 +1,82 @@
+/*
+ * SSA/ASS decoder
+ * 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 <string.h>
+
+#include "avcodec.h"
+#include "ass.h"
+#include "ass_split.h"
+#include "libavutil/internal.h"
+#include "libavutil/mem.h"
+
+static av_cold int ass_decode_init(AVCodecContext *avctx)
+{
+    avctx->subtitle_header = av_malloc(avctx->extradata_size + 1);
+    if (!avctx->subtitle_header)
+        return AVERROR(ENOMEM);
+    memcpy(avctx->subtitle_header, avctx->extradata, avctx->extradata_size);
+    avctx->subtitle_header[avctx->extradata_size] = 0;
+    avctx->subtitle_header_size = avctx->extradata_size;
+    avctx->priv_data = ff_ass_split(avctx->extradata);
+    if(!avctx->priv_data)
+        return -1;
+    return 0;
+}
+
+static int ass_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr,
+                            AVPacket *avpkt)
+{
+    const char *ptr = avpkt->data;
+    int len, size = avpkt->size;
+
+    while (size > 0) {
+        int duration;
+        ASSDialog *dialog = ff_ass_split_dialog(avctx->priv_data, ptr, 0, NULL);
+        if (!dialog)
+            return AVERROR_INVALIDDATA;
+        duration = dialog->end - dialog->start;
+        len = ff_ass_add_rect(data, ptr, 0, duration, 1);
+        if (len < 0)
+            return len;
+        ptr  += len;
+        size -= len;
+    }
+
+    *got_sub_ptr = avpkt->size > 0;
+    return avpkt->size;
+}
+
+static int ass_decode_close(AVCodecContext *avctx)
+{
+    ff_ass_split_free(avctx->priv_data);
+    avctx->priv_data = NULL;
+    return 0;
+}
+
+AVCodec ff_ass_decoder = {
+    .name         = "ass",
+    .long_name    = NULL_IF_CONFIG_SMALL("SSA (SubStation Alpha) subtitle"),
+    .type         = AVMEDIA_TYPE_SUBTITLE,
+    .id           = AV_CODEC_ID_SSA,
+    .init         = ass_decode_init,
+    .decode       = ass_decode_frame,
+    .close        = ass_decode_close,
+};