lavf: add internal demuxer helpers for subtitles.

1 files changed, 61 insertions, 0 deletions

diff --git a/libavformat/subtitles.h b/libavformat/subtitles.h
new file mode 100644
index 0000000000..8a75161d5e
--- /dev/null
+++ b/libavformat/subtitles.h
@@ -0,0 +1,61 @@
+/*
+ * 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
+ */
+
+#ifndef AVFORMAT_SUBTITLES_H
+#define AVFORMAT_SUBTITLES_H
+
+#include <stdint.h>
+#include "avformat.h"
+
+typedef struct {
+    AVPacket *subs;         ///< array of subtitles packets
+    int nb_subs;            ///< number of subtitles packets
+    int allocated_size;     ///< allocated size for subs
+    int current_sub_idx;    ///< current position for the read packet callback
+} FFDemuxSubtitlesQueue;
+
+/**
+ * Insert a new subtitle event.
+ *
+ * @param event the subtitle line, may not be zero terminated
+ * @param len   the length of the event (in strlen() sense, so without '\0')
+ * @param merge set to 1 if the current event should be concatenated with the
+ *              previous one instead of adding a new entry, 0 otherwise
+ */
+AVPacket *ff_subtitles_queue_insert(FFDemuxSubtitlesQueue *q,
+                                    const uint8_t *event, int len, int merge);
+
+/**
+ * Set missing durations and sort subtitles by PTS, and then byte position.
+ */
+void ff_subtitles_queue_finalize(FFDemuxSubtitlesQueue *q);
+
+/**
+ * Generic read_packet() callback for subtitles demuxers using this queue
+ * system.
+ */
+int ff_subtitles_queue_read_packet(FFDemuxSubtitlesQueue *q, AVPacket *pkt);
+
+/**
+ * Remove and destroy all the subtitles packets.
+ */
+void ff_subtitles_queue_clean(FFDemuxSubtitlesQueue *q);
+
+#endif /* AVFORMAT_SUBTITLES_H */