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lavc: add a null bitstream filter

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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.
This commit is contained in:
Anton Khirnov 2016-05-24 15:09:29 +02:00
parent 0309ddcfb2
commit 47e547b321
4 changed files with 48 additions and 0 deletions
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3
doc/bitstream_filters.texi
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@ -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

1
libavcodec/Makefile
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@ -764,6 +764,7 @@ 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

1
libavcodec/bitstream_filters.c
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@ -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;

43
libavcodec/null_bsf.c Normal file
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@ -0,0 +1,43 @@
/*
* 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,
};