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-rw-r--r--libavcodec/realtextdec.c85
1 files changed, 85 insertions, 0 deletions
diff --git a/libavcodec/realtextdec.c b/libavcodec/realtextdec.c
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+/*
+ * Copyright (c) 2012 Clément Bœsch
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * RealText subtitle decoder
+ * @see http://service.real.com/help/library/guides/ProductionGuide/prodguide/htmfiles/realtext.htm
+ */
+
+#include "avcodec.h"
+#include "ass.h"
+#include "libavutil/avstring.h"
+#include "libavutil/bprint.h"
+
+static int rt_event_to_ass(AVBPrint *buf, const char *p)
+{
+ int prev_chr_is_space = 1;
+
+ while (*p) {
+ if (*p != '<') {
+ if (!av_isspace(*p))
+ av_bprint_chars(buf, *p, 1);
+ else if (!prev_chr_is_space)
+ av_bprint_chars(buf, ' ', 1);
+ prev_chr_is_space = av_isspace(*p);
+ } else {
+ const char *end = strchr(p, '>');
+ if (!end)
+ break;
+ if (!av_strncasecmp(p, "<br/>", 5) ||
+ !av_strncasecmp(p, "<br>", 4)) {
+ av_bprintf(buf, "\\N");
+ }
+ p = end;
+ }
+ p++;
+ }
+ return 0;
+}
+
+static int realtext_decode_frame(AVCodecContext *avctx,
+ void *data, int *got_sub_ptr, AVPacket *avpkt)
+{
+ int ret = 0;
+ AVSubtitle *sub = data;
+ const char *ptr = avpkt->data;
+ AVBPrint buf;
+
+ av_bprint_init(&buf, 0, 4096);
+ // note: no need to rescale pts & duration since they are in the same
+ // timebase as ASS (1/100)
+ if (ptr && avpkt->size > 0 && !rt_event_to_ass(&buf, ptr))
+ ret = ff_ass_add_rect_bprint(sub, &buf, avpkt->pts, avpkt->duration);
+ av_bprint_finalize(&buf, NULL);
+ if (ret < 0)
+ return ret;
+ *got_sub_ptr = sub->num_rects > 0;
+ return avpkt->size;
+}
+
+AVCodec ff_realtext_decoder = {
+ .name = "realtext",
+ .long_name = NULL_IF_CONFIG_SMALL("RealText subtitle"),
+ .type = AVMEDIA_TYPE_SUBTITLE,
+ .id = AV_CODEC_ID_REALTEXT,
+ .decode = realtext_decode_frame,
+ .init = ff_ass_subtitle_header_default,
+};