Add bitstream filter to convert between mov and plain text subtitles

Originally committed as revision 11659 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 55 insertions, 0 deletions

diff --git a/libavcodec/movsub_bsf.c b/libavcodec/movsub_bsf.c
new file mode 100644
index 0000000000..99e8135f5e
--- /dev/null
+++ b/libavcodec/movsub_bsf.c
@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2008 Reimar Döffinger
+ *
+ * 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"
+
+
+static int text2movsub(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
+                     uint8_t **poutbuf, int *poutbuf_size,
+                     const uint8_t *buf, int buf_size, int keyframe){
+    if (buf_size > 0xffff) return 0;
+    *poutbuf_size = buf_size + 2;
+    *poutbuf = av_malloc(*poutbuf_size + FF_INPUT_BUFFER_PADDING_SIZE);
+    AV_WB16(*poutbuf, buf_size);
+    memcpy(*poutbuf + 2, buf, buf_size);
+    return 1;
+}
+
+AVBitStreamFilter text2movsub_bsf={
+    "text2movsub",
+    0,
+    text2movsub,
+};
+
+static int mov2textsub(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
+                     uint8_t **poutbuf, int *poutbuf_size,
+                     const uint8_t *buf, int buf_size, int keyframe){
+    if (buf_size < 2) return 0;
+    *poutbuf_size = FFMIN(buf_size - 2, AV_RB16(buf));
+    *poutbuf = av_malloc(*poutbuf_size + FF_INPUT_BUFFER_PADDING_SIZE);
+    memcpy(*poutbuf, buf + 2, *poutbuf_size);
+    return 1;
+}
+
+AVBitStreamFilter mov2textsub_bsf={
+    "mov2textsub",
+    0,
+    mov2textsub,
+};