Signed-off-by: softworkz <softwo...@hotmail.com>
---
libavfilter/Makefile | 1 +
libavfilter/internal.h | 8 ++++++
libavfilter/subtitles.c | 61 +++++++++++++++++++++++++++++++++++++++++
libavfilter/subtitles.h | 42 ++++++++++++++++++++++++++++
4 files changed, 112 insertions(+)
create mode 100644 libavfilter/subtitles.c
create mode 100644 libavfilter/subtitles.h
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 102ce7beff..db32cf1265 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -19,6 +19,7 @@ OBJS = allfilters.o
\
framequeue.o \
graphdump.o \
graphparser.o \
+ subtitles.o \
video.o \
OBJS-$(HAVE_THREADS) += pthread.o
diff --git a/libavfilter/internal.h b/libavfilter/internal.h
index a0aa32af4d..4f9aedf151 100644
--- a/libavfilter/internal.h
+++ b/libavfilter/internal.h
@@ -87,6 +87,14 @@ struct AVFilterPad {
AVFrame *(*audio)(AVFilterLink *link, int nb_samples);
} get_buffer;
+ /**
+ * Callback function to get a subtitle buffer. If NULL, the filter system
will
+ * use ff_default_get_subtitle_buffer().
+ *
+ * Input subtitle pads only.
+ */
+ AVFrame *(*get_subtitle_buffer)(AVFilterLink *link, int format);
+
/**
* Filtering callback. This is where a filter receives a frame with
* audio/video data and should do its processing.
diff --git a/libavfilter/subtitles.c b/libavfilter/subtitles.c
new file mode 100644
index 0000000000..188ff1289c
--- /dev/null
+++ b/libavfilter/subtitles.c
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2021 softworkz
+ *
+ * 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
+ */
+
+#include "libavutil/common.h"
+
+#include "subtitles.h"
+#include "avfilter.h"
+#include "internal.h"
+
+
+AVFrame *ff_null_get_subtitles_buffer(AVFilterLink *link, int format)
+{
+ return ff_get_subtitles_buffer(link->dst->outputs[0], format);
+}
+
+AVFrame *ff_default_get_subtitles_buffer(AVFilterLink *link, int format)
+{
+ AVFrame *frame = NULL;
+
+ // TODO:
+ //frame = ff_frame_pool_get(link->frame_pool);
+
+ frame = av_frame_alloc();
+ if (!frame)
+ return NULL;
+
+ frame->format = format;
+ frame->type = AVMEDIA_TYPE_SUBTITLE;
+
+ return frame;
+}
+
+AVFrame *ff_get_subtitles_buffer(AVFilterLink *link, int format)
+{
+ AVFrame *ret = NULL;
+
+ if (link->dstpad->get_subtitle_buffer)
+ ret = link->dstpad->get_subtitle_buffer(link, format);
+
+ if (!ret)
+ ret = ff_default_get_subtitles_buffer(link, format);
+
+ return ret;
+}
diff --git a/libavfilter/subtitles.h b/libavfilter/subtitles.h
new file mode 100644
index 0000000000..b964b61c37
--- /dev/null
+++ b/libavfilter/subtitles.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2021 softworkz
+ *
+ * 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 AVFILTER_SUBTITLES_H
+#define AVFILTER_SUBTITLES_H
+
+#include "avfilter.h"
+#include "internal.h"
+
+/** default handler for get_subtitles_buffer() for subtitle inputs */
+AVFrame *ff_default_get_subtitles_buffer(AVFilterLink *link, int format);
+
+/** get_subtitles_buffer() handler for filters which simply pass subtitles
along */
+AVFrame *ff_null_get_subtitles_buffer(AVFilterLink *link, int format);
+
+/**
+ * Request a subtitles buffer with a specific set of permissions.
+ *
+ * @param link the output link to the filter from which the buffer
will
+ * be requested
+ * @return The subtitles format.
+ */
+AVFrame *ff_get_subtitles_buffer(AVFilterLink *link, int format);
+
+#endif /* AVFILTER_SUBTITLES_H */
--
2.28.0.windows.1
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