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lavc: add a null bitstream filter
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.
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@ -90,6 +90,9 @@ avconv -i frame_%d.jpg -c:v copy rotated.avi
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@section noise
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@section null
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This bitstream filter passes the packets through unchanged.
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@section remove_extradata
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@c man end BITSTREAM FILTERS
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@ -764,6 +764,7 @@ OBJS-$(CONFIG_MJPEG2JPEG_BSF) += mjpeg2jpeg_bsf.o
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OBJS-$(CONFIG_MJPEGA_DUMP_HEADER_BSF) += mjpega_dump_header_bsf.o
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OBJS-$(CONFIG_MOV2TEXTSUB_BSF) += movsub_bsf.o
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OBJS-$(CONFIG_NOISE_BSF) += noise_bsf.o
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OBJS-$(CONFIG_NULL_BSF) += null_bsf.o
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OBJS-$(CONFIG_REMOVE_EXTRADATA_BSF) += remove_extradata_bsf.o
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OBJS-$(CONFIG_TEXT2MOVSUB_BSF) += movsub_bsf.o
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@ -34,6 +34,7 @@ extern const AVBitStreamFilter ff_imx_dump_header_bsf;
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extern const AVBitStreamFilter ff_mjpeg2jpeg_bsf;
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extern const AVBitStreamFilter ff_mjpega_dump_header_bsf;
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extern const AVBitStreamFilter ff_mov2textsub_bsf;
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extern const AVBitStreamFilter ff_null_bsf;
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extern const AVBitStreamFilter ff_text2movsub_bsf;
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extern const AVBitStreamFilter ff_noise_bsf;
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extern const AVBitStreamFilter ff_remove_extradata_bsf;
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43
libavcodec/null_bsf.c
Normal file
43
libavcodec/null_bsf.c
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@ -0,0 +1,43 @@
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/*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Null bitstream filter -- pass the input through unchanged.
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*/
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#include "avcodec.h"
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#include "bsf.h"
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static int null_filter(AVBSFContext *ctx, AVPacket *out)
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{
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AVPacket *in;
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int ret;
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ret = ff_bsf_get_packet(ctx, &in);
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if (ret < 0)
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return ret;
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av_packet_move_ref(out, in);
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av_packet_free(&in);
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return 0;
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}
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const AVBitStreamFilter ff_null_bsf = {
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.name = "null",
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.filter = null_filter,
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};
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