Add MPL2 subtitles demuxer and decoder.

1 files changed, 96 insertions, 0 deletions

diff --git a/libavcodec/mpl2dec.c b/libavcodec/mpl2dec.c
new file mode 100644
index 0000000000..a777c7c616
--- /dev/null
+++ b/libavcodec/mpl2dec.c
@@ -0,0 +1,96 @@
+/*
+ * 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
+ * MPL2 subtitles decoder
+ *
+ * @see http://web.archive.org/web/20090328040233/http://napisy.ussbrowarek.org/mpl2-eng.html
+ */
+
+#include "avcodec.h"
+#include "ass.h"
+#include "libavutil/bprint.h"
+
+static int mpl2_event_to_ass(AVBPrint *buf, const char *p)
+{
+    if (*p == ' ')
+        p++;
+
+    while (*p) {
+        int got_style = 0;
+
+        while (*p && strchr("/\\_", *p)) {
+            if      (*p == '/')  av_bprintf(buf, "{\\i1}");
+            else if (*p == '\\') av_bprintf(buf, "{\\b1}");
+            else if (*p == '_')  av_bprintf(buf, "{\\u1}");
+            got_style = 1;
+            p++;
+        }
+
+        while (*p && *p != '|') {
+            if (*p != '\r' && *p != '\n')
+                av_bprint_chars(buf, *p, 1);
+            p++;
+        }
+
+        if (*p == '|') {
+            if (got_style)
+                av_bprintf(buf, "{\\r}");
+            av_bprintf(buf, "\\N");
+            p++;
+        }
+    }
+
+    av_bprintf(buf, "\r\n");
+    return 0;
+}
+
+static int mpl2_decode_frame(AVCodecContext *avctx, void *data,
+                             int *got_sub_ptr, AVPacket *avpkt)
+{
+    AVBPrint buf;
+    AVSubtitle *sub = data;
+    const char *ptr = avpkt->data;
+    const int ts_start     = av_rescale_q(avpkt->pts,      avctx->time_base, (AVRational){1,100});
+    const int ts_duration  = avpkt->duration != -1 ?
+                             av_rescale_q(avpkt->duration, avctx->time_base, (AVRational){1,100}) : -1;
+
+    av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
+    if (ptr && avpkt->size > 0 && *ptr && !mpl2_event_to_ass(&buf, ptr)) {
+        if (!av_bprint_is_complete(&buf)) {
+            av_bprint_finalize(&buf, NULL);
+            return AVERROR(ENOMEM);
+        }
+        ff_ass_add_rect(sub, buf.str, ts_start, ts_duration, 0);
+    }
+    *got_sub_ptr = sub->num_rects > 0;
+    av_bprint_finalize(&buf, NULL);
+    return avpkt->size;
+}
+
+AVCodec ff_mpl2_decoder = {
+    .name           = "mpl2",
+    .long_name      = NULL_IF_CONFIG_SMALL("MPL2 subtitle"),
+    .type           = AVMEDIA_TYPE_SUBTITLE,
+    .id             = AV_CODEC_ID_MPL2,
+    .decode         = mpl2_decode_frame,
+    .init           = ff_ass_subtitle_header_default,
+};