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-rw-r--r--libavcodec/subviewerdec.c83
1 files changed, 83 insertions, 0 deletions
diff --git a/libavcodec/subviewerdec.c b/libavcodec/subviewerdec.c
new file mode 100644
index 0000000000..63be4188b9
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+++ b/libavcodec/subviewerdec.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
+ * SubViewer subtitle decoder
+ * @see https://en.wikipedia.org/wiki/SubViewer
+ */
+
+#include "avcodec.h"
+#include "ass.h"
+#include "libavutil/bprint.h"
+
+static int subviewer_event_to_ass(AVBPrint *buf, const char *p)
+{
+ while (*p) {
+ if (!strncmp(p, "[br]", 4)) {
+ av_bprintf(buf, "\\N");
+ p += 4;
+ } else {
+ if (p[0] == '\n' && p[1])
+ av_bprintf(buf, "\\N");
+ else if (*p != '\n' && *p != '\r')
+ av_bprint_chars(buf, *p, 1);
+ p++;
+ }
+ }
+
+ av_bprintf(buf, "\r\n");
+ return 0;
+}
+
+static int subviewer_decode_frame(AVCodecContext *avctx,
+ void *data, int *got_sub_ptr, AVPacket *avpkt)
+{
+ char c;
+ AVSubtitle *sub = data;
+ const char *ptr = avpkt->data;
+ AVBPrint buf;
+
+ /* To be removed later */
+ if (ptr && sscanf(ptr, "%*u:%*u:%*u.%*u,%*u:%*u:%*u.%*u%c", &c) == 1) {
+ av_log(avctx, AV_LOG_ERROR, "AVPacket is not clean (contains timing "
+ "information). You need to upgrade your libavformat or "
+ "sanitize your packet.\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
+ // note: no need to rescale pts & duration since they are in the same
+ // timebase as ASS (1/100)
+ if (ptr && avpkt->size > 0 && !subviewer_event_to_ass(&buf, ptr))
+ ff_ass_add_rect(sub, buf.str, avpkt->pts, avpkt->duration, 0);
+ *got_sub_ptr = sub->num_rects > 0;
+ av_bprint_finalize(&buf, NULL);
+ return avpkt->size;
+}
+
+AVCodec ff_subviewer_decoder = {
+ .name = "subviewer",
+ .long_name = NULL_IF_CONFIG_SMALL("SubViewer subtitle"),
+ .type = AVMEDIA_TYPE_SUBTITLE,
+ .id = AV_CODEC_ID_SUBVIEWER,
+ .decode = subviewer_decode_frame,
+ .init = ff_ass_subtitle_header_default,
+};