It is useful for testing/debugging and will also be used as the default
filter in the following commit adding pre-decode filtering to avoid
having a separate non-filtered codepath.
---
doc/bitstream_filters.texi | 3 +++
libavcodec/Makefile | 1 +
libavcodec/bitstream_filters.c | 1 +
libavcodec/null_bsf.c | 44 ++++++++++++++++++++++++++++++++++++++++++
4 files changed, 49 insertions(+)
create mode 100644 libavcodec/null_bsf.c
diff --git a/doc/bitstream_filters.texi b/doc/bitstream_filters.texi
index 7ddf52e..2e13cbe 100644
--- a/doc/bitstream_filters.texi
+++ b/doc/bitstream_filters.texi
@@ -90,6 +90,9 @@ avconv -i frame_%d.jpg -c:v copy rotated.avi
@section noise
+@section null
+This bitstream filter passes the packets through unchanged.
+
@section remove_extradata
@c man end BITSTREAM FILTERS
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index dee3d13..4d421ce 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -760,6 +760,7 @@ OBJS-$(CONFIG_MJPEG2JPEG_BSF) +=
mjpeg2jpeg_bsf.o
OBJS-$(CONFIG_MJPEGA_DUMP_HEADER_BSF) += mjpega_dump_header_bsf.o
OBJS-$(CONFIG_MOV2TEXTSUB_BSF) += movsub_bsf.o
OBJS-$(CONFIG_NOISE_BSF) += noise_bsf.o
+OBJS-$(CONFIG_NULL_BSF) += null_bsf.o
OBJS-$(CONFIG_REMOVE_EXTRADATA_BSF) += remove_extradata_bsf.o
OBJS-$(CONFIG_TEXT2MOVSUB_BSF) += movsub_bsf.o
diff --git a/libavcodec/bitstream_filters.c b/libavcodec/bitstream_filters.c
index 8a5379e..ee9e4ba 100644
--- a/libavcodec/bitstream_filters.c
+++ b/libavcodec/bitstream_filters.c
@@ -34,6 +34,7 @@ extern const AVBitStreamFilter ff_imx_dump_header_bsf;
extern const AVBitStreamFilter ff_mjpeg2jpeg_bsf;
extern const AVBitStreamFilter ff_mjpega_dump_header_bsf;
extern const AVBitStreamFilter ff_mov2textsub_bsf;
+extern const AVBitStreamFilter ff_null_bsf;
extern const AVBitStreamFilter ff_text2movsub_bsf;
extern const AVBitStreamFilter ff_noise_bsf;
extern const AVBitStreamFilter ff_remove_extradata_bsf;
diff --git a/libavcodec/null_bsf.c b/libavcodec/null_bsf.c
new file mode 100644
index 0000000..790bc67
--- /dev/null
+++ b/libavcodec/null_bsf.c
@@ -0,0 +1,44 @@
+/*
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * Null bitstream filter -- pass the input through unchanged.
+ */
+
+#include "avcodec.h"
+#include "bsf.h"
+
+static int null_filter(AVBSFContext *ctx, AVPacket *out)
+{
+ AVPacket *in;
+ int ret;
+
+ ret = ff_bsf_get_packet(ctx, &in);
+ if (ret < 0)
+ return ret;
+ av_packet_move_ref(out, in);
+ av_packet_free(&in);
+ return 0;
+}
+
+const AVBitStreamFilter ff_null_bsf = {
+ .name = "null",
+ .filter = null_filter,
+};
+
--
2.0.0
_______________________________________________
libav-devel mailing list
[email protected]
https://lists.libav.org/mailman/listinfo/libav-devel
