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* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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* This file is part of FFmpeg.
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* FFmpeg 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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* FFmpeg 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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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; 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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AVBitStreamFilter *first_bitstream_filter= NULL;
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void av_register_bitstream_filter(AVBitStreamFilter *bsf){
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bsf->next = first_bitstream_filter;
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first_bitstream_filter= bsf;
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AVBitStreamFilterContext *av_bitstream_filter_init(const char *name){
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AVBitStreamFilter *bsf= first_bitstream_filter;
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if(!strcmp(name, bsf->name)){
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AVBitStreamFilterContext *bsfc= av_mallocz(sizeof(AVBitStreamFilterContext));
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bsfc->priv_data= av_mallocz(bsf->priv_data_size);
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void av_bitstream_filter_close(AVBitStreamFilterContext *bsfc){
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av_freep(&bsfc->priv_data);
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av_parser_close(bsfc->parser);
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int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
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AVCodecContext *avctx, const char *args,
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uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size, int keyframe){
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*poutbuf= (uint8_t *) buf;
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*poutbuf_size= buf_size;
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return bsfc->filter->filter(bsfc, avctx, args, poutbuf, poutbuf_size, buf, buf_size, keyframe);
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static int dump_extradata(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
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uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size, int keyframe){
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int cmd= args ? *args : 0;
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/* cast to avoid warning about discarding qualifiers */
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if( (keyframe && (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER) && cmd=='a')
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||(keyframe && (cmd=='k' || !cmd))
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/*||(? && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_BEGIN)*/){
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int size= buf_size + avctx->extradata_size;
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*poutbuf= av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
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memcpy(*poutbuf, avctx->extradata, avctx->extradata_size);
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memcpy((*poutbuf) + avctx->extradata_size, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
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static int remove_extradata(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
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uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size, int keyframe){
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int cmd= args ? *args : 0;
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AVCodecParserContext *s;
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bsfc->parser= av_parser_init(avctx->codec_id);
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if(s && s->parser->split){
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if( (((avctx->flags & CODEC_FLAG_GLOBAL_HEADER) || (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER)) && cmd=='a')
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||(!keyframe && cmd=='k')
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int i= s->parser->split(avctx, buf, buf_size);
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*poutbuf= (uint8_t *) buf;
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*poutbuf_size= buf_size;
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static int noise(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
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uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size, int keyframe){
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int amount= args ? atoi(args) : 10000;
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unsigned int *state= bsfc->priv_data;
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*poutbuf= av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
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memcpy(*poutbuf, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
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for(i=0; i<buf_size; i++){
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(*state) += (*poutbuf)[i] + 1;
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if(*state % amount == 0)
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(*poutbuf)[i] = *state;
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AVBitStreamFilter dump_extradata_bsf={
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AVBitStreamFilter remove_extradata_bsf={
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AVBitStreamFilter noise_bsf={