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Add a chomp BSF to consume zero padding at the end of a packet.

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Originally committed as revision 23196 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Alex Converse 2010-05-19 20:18:40 +00:00
parent c16d5a6f14
commit c2341b8596
3 changed files with 49 additions and 0 deletions
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1
libavcodec/Makefile
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@ -577,6 +577,7 @@ OBJS-$(CONFIG_VP3_PARSER) += vp3_parser.o
# bitstream filters
OBJS-$(CONFIG_AAC_ADTSTOASC_BSF) += aac_adtstoasc_bsf.o
OBJS-$(CONFIG_CHOMP_BSF) += chomp_bsf.o
OBJS-$(CONFIG_DUMP_EXTRADATA_BSF) += dump_extradata_bsf.o
OBJS-$(CONFIG_H264_MP4TOANNEXB_BSF) += h264_mp4toannexb_bsf.o
OBJS-$(CONFIG_IMX_DUMP_HEADER_BSF) += imx_dump_header_bsf.o

1
libavcodec/allcodecs.c
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@ -375,6 +375,7 @@ void avcodec_register_all(void)
/* bitstream filters */
REGISTER_BSF (AAC_ADTSTOASC, aac_adtstoasc);
REGISTER_BSF (CHOMP, chomp);
REGISTER_BSF (DUMP_EXTRADATA, dump_extradata);
REGISTER_BSF (H264_MP4TOANNEXB, h264_mp4toannexb);
REGISTER_BSF (IMX_DUMP_HEADER, imx_dump_header);

47
libavcodec/chomp_bsf.c Normal file
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@ -0,0 +1,47 @@
/*
* Chomp bitstream filter
* Copyright (c) 2010 Alex Converse <alex.converse@gmail.com>
*
* 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 "avcodec.h"
#include "internal.h"
static int chomp_filter(AVBitStreamFilterContext *bsfc,
AVCodecContext *avctx, const char *args,
uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size,
int keyframe)
{
while (buf_size > 0 && !buf[buf_size-1])
buf_size--;
*poutbuf = (uint8_t*) buf;
*poutbuf_size = buf_size;
return 0;
}
/**
* This filter removes a string of \0 bytes from the end of a packet.
*/
AVBitStreamFilter chomp_bsf = {
"chomp",
0,
chomp_filter,
};