Add MPL2 subtitles demuxer and decoder.

1 files changed, 146 insertions, 0 deletions

diff --git a/libavformat/mpl2dec.c b/libavformat/mpl2dec.c
new file mode 100644
index 0000000000..ce2061bb8b
--- /dev/null
+++ b/libavformat/mpl2dec.c
@@ -0,0 +1,146 @@
+/*
+ * 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 format demuxer
+ */
+
+#include "avformat.h"
+#include "internal.h"
+#include "subtitles.h"
+
+typedef struct {
+    FFDemuxSubtitlesQueue q;
+} MPL2Context;
+
+static int mpl2_probe(AVProbeData *p)
+{
+    int i;
+    char c;
+    int64_t start, end;
+    const unsigned char *ptr = p->buf;
+    const unsigned char *ptr_end = ptr + p->buf_size;
+
+    for (i = 0; i < 2; i++) {
+        if (sscanf(ptr, "[%"PRId64"][%"PRId64"]%c", &start, &end, &c) != 3 &&
+            sscanf(ptr, "[%"PRId64"][]%c",          &start,       &c) != 2)
+            return 0;
+        ptr += strcspn(ptr, "\r\n") + 1;
+        if (ptr >= ptr_end)
+            return 0;
+    }
+    return AVPROBE_SCORE_MAX;
+}
+
+static int read_ts(char **line, int64_t *pts_start, int *duration)
+{
+    char c;
+    int len;
+    int64_t end;
+
+    if (sscanf(*line, "[%"PRId64"][]%c%n",
+               pts_start, &c, &len) >= 2) {
+        *duration = -1;
+        *line += len - 1;
+        return 0;
+    }
+    if (sscanf(*line, "[%"PRId64"][%"PRId64"]%c%n",
+               pts_start, &end, &c, &len) >= 3) {
+        *duration = end - *pts_start;
+        *line += len - 1;
+        return 0;
+    }
+    return -1;
+}
+
+static int mpl2_read_header(AVFormatContext *s)
+{
+    MPL2Context *mpl2 = s->priv_data;
+    AVStream *st = avformat_new_stream(s, NULL);
+    int res = 0;
+
+    if (!st)
+        return AVERROR(ENOMEM);
+    avpriv_set_pts_info(st, 64, 1, 10);
+    st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
+    st->codec->codec_id   = AV_CODEC_ID_MPL2;
+
+    while (!url_feof(s->pb)) {
+        char line[4096];
+        char *p = line;
+        const int64_t pos = avio_tell(s->pb);
+        int len = ff_get_line(s->pb, line, sizeof(line));
+        int64_t pts_start;
+        int duration;
+
+        if (!len)
+            break;
+
+        line[strcspn(line, "\r\n")] = 0;
+
+        if (!read_ts(&p, &pts_start, &duration)) {
+            AVPacket *sub;
+
+            sub = ff_subtitles_queue_insert(&mpl2->q, p, strlen(p), 0);
+            if (!sub)
+                return AVERROR(ENOMEM);
+            sub->pos = pos;
+            sub->pts = pts_start;
+            sub->duration = duration;
+        }
+    }
+
+    ff_subtitles_queue_finalize(&mpl2->q);
+    return res;
+}
+
+static int mpl2_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    MPL2Context *mpl2 = s->priv_data;
+    return ff_subtitles_queue_read_packet(&mpl2->q, pkt);
+}
+
+static int mpl2_read_seek(AVFormatContext *s, int stream_index,
+                          int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
+{
+    MPL2Context *mpl2 = s->priv_data;
+    return ff_subtitles_queue_seek(&mpl2->q, s, stream_index,
+                                   min_ts, ts, max_ts, flags);
+}
+
+static int mpl2_read_close(AVFormatContext *s)
+{
+    MPL2Context *mpl2 = s->priv_data;
+    ff_subtitles_queue_clean(&mpl2->q);
+    return 0;
+}
+
+AVInputFormat ff_mpl2_demuxer = {
+    .name           = "mpl2",
+    .long_name      = NULL_IF_CONFIG_SMALL("MPL2 subtitles"),
+    .priv_data_size = sizeof(MPL2Context),
+    .read_probe     = mpl2_probe,
+    .read_header    = mpl2_read_header,
+    .read_packet    = mpl2_read_packet,
+    .read_seek2     = mpl2_read_seek,
+    .read_close     = mpl2_read_close,
+    .extensions     = "txt,mpl2",
+};