[FFmpeg-devel] [PATCH v17 08/19] avfilter/subtitles: Add subtitles.c for subtitle frame allocation
Soft Works
softworkz at hotmail.com
Sat Nov 27 21:37:53 EET 2021
Analog to avfilter/video.c and avfilter/audio.c
Signed-off-by: softworkz <softworkz at hotmail.com>
---
libavfilter/Makefile | 1 +
libavfilter/avfilter.c | 4 +++
libavfilter/internal.h | 1 +
libavfilter/subtitles.c | 63 +++++++++++++++++++++++++++++++++++++++++
libavfilter/subtitles.h | 44 ++++++++++++++++++++++++++++
5 files changed, 113 insertions(+)
create mode 100644 libavfilter/subtitles.c
create mode 100644 libavfilter/subtitles.h
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 0e27aeeff6..99f3047965 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/avfilter.c b/libavfilter/avfilter.c
index 7362bcdab5..df5b8f483c 100644
--- a/libavfilter/avfilter.c
+++ b/libavfilter/avfilter.c
@@ -43,6 +43,7 @@
#include "formats.h"
#include "framepool.h"
#include "internal.h"
+#include "subtitles.h"
#include "libavutil/ffversion.h"
const char av_filter_ffversion[] = "FFmpeg version " FFMPEG_VERSION;
@@ -1475,6 +1476,9 @@ int ff_inlink_make_frame_writable(AVFilterLink *link, AVFrame **rframe)
case AVMEDIA_TYPE_AUDIO:
out = ff_get_audio_buffer(link, frame->nb_samples);
break;
+ case AVMEDIA_TYPE_SUBTITLE:
+ out = ff_get_subtitles_buffer(link, link->format);
+ break;
default:
return AVERROR(EINVAL);
}
diff --git a/libavfilter/internal.h b/libavfilter/internal.h
index 1099b82b4b..fc09ef574c 100644
--- a/libavfilter/internal.h
+++ b/libavfilter/internal.h
@@ -90,6 +90,7 @@ struct AVFilterPad {
union {
AVFrame *(*video)(AVFilterLink *link, int w, int h);
AVFrame *(*audio)(AVFilterLink *link, int nb_samples);
+ AVFrame *(*subtitle)(AVFilterLink *link, int format);
} get_buffer;
/**
diff --git a/libavfilter/subtitles.c b/libavfilter/subtitles.c
new file mode 100644
index 0000000000..951bfd612c
--- /dev/null
+++ b/libavfilter/subtitles.c
@@ -0,0 +1,63 @@
+/*
+ * 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;
+
+ frame = av_frame_alloc();
+ if (!frame)
+ return NULL;
+
+ frame->format = format;
+ frame->type = AVMEDIA_TYPE_SUBTITLE;
+
+ if (av_frame_get_buffer2(frame, 0) < 0) {
+ av_frame_free(&frame);
+ return NULL;
+ }
+
+ return frame;
+}
+
+AVFrame *ff_get_subtitles_buffer(AVFilterLink *link, int format)
+{
+ AVFrame *ret = NULL;
+
+ if (link->dstpad->get_buffer.subtitle)
+ ret = link->dstpad->get_buffer.subtitle(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..4a9115126e
--- /dev/null
+++ b/libavfilter/subtitles.h
@@ -0,0 +1,44 @@
+/*
+ * 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 frame with a specific set of permissions.
+ *
+ * @param link the output link to the filter from which the buffer will
+ * be requested
+ * @param format The subtitles format.
+ * @return A reference to the frame. This must be unreferenced with
+ * av_frame_free when you are finished with it.
+*/
+AVFrame *ff_get_subtitles_buffer(AVFilterLink *link, int format);
+
+#endif /* AVFILTER_SUBTITLES_H */
--
2.30.2.windows.1
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