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noise bitstream filter

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add priv_data field to AVBitStreamFilterContext

Originally committed as revision 5644 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2006-07-06 15:28:17 +00:00
parent 748c2fca7e
commit 514e0831ae
3 changed files with 34 additions and 2 deletions
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1
libavcodec/allcodecs.c
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@ -664,5 +664,6 @@ PCM_CODEC(CODEC_ID_ADPCM_SBPRO_2, adpcm_sbpro_2);
av_register_bitstream_filter(&dump_extradata_bsf);
av_register_bitstream_filter(&remove_extradata_bsf);
av_register_bitstream_filter(&noise_bsf);
}

3
libavcodec/avcodec.h
View File

@ -2573,6 +2573,7 @@ extern AVCodecParser aac_parser;
typedef struct AVBitStreamFilterContext {
void *priv_data;
struct AVBitStreamFilter *filter;
AVCodecParserContext *parser;
struct AVBitStreamFilterContext *next;
@ -2581,6 +2582,7 @@ typedef struct AVBitStreamFilterContext {
typedef struct AVBitStreamFilter {
const char *name;
int priv_data_size;
int (*filter)(AVBitStreamFilterContext *bsfc,
AVCodecContext *avctx, const char *args,
uint8_t **poutbuf, int *poutbuf_size,
@ -2600,6 +2602,7 @@ void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
extern AVBitStreamFilter dump_extradata_bsf;
extern AVBitStreamFilter remove_extradata_bsf;
extern AVBitStreamFilter noise_bsf;
/* memory */

32
libavcodec/bitstream_filter.c
View File

@ -15,6 +15,7 @@ AVBitStreamFilterContext *av_bitstream_filter_init(const char *name){
if(!strcmp(name, bsf->name)){
AVBitStreamFilterContext *bsfc= av_mallocz(sizeof(AVBitStreamFilterContext));
bsfc->filter= bsf;
bsfc->priv_data= av_mallocz(bsf->priv_data_size);
return bsfc;
}
bsf= bsf->next;
@ -23,6 +24,7 @@ AVBitStreamFilterContext *av_bitstream_filter_init(const char *name){
}
void av_bitstream_filter_close(AVBitStreamFilterContext *bsfc){
av_freep(&bsfc->priv_data);
av_parser_close(bsfc->parser);
av_free(bsfc);
}
@ -31,6 +33,8 @@ int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
AVCodecContext *avctx, const char *args,
uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size, int keyframe){
*poutbuf= (uint8_t *) buf;
*poutbuf_size= buf_size;
return bsfc->filter->filter(bsfc, avctx, args, poutbuf, poutbuf_size, buf, buf_size, keyframe);
}
@ -39,8 +43,6 @@ static int dump_extradata(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx,
const uint8_t *buf, int buf_size, int keyframe){
int cmd= args ? *args : 0;
/* cast to avoid warning about discarding qualifiers */
*poutbuf= (uint8_t *) buf;
*poutbuf_size= buf_size;
if(avctx->extradata){
if( (keyframe && (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER) && cmd=='a')
||(keyframe && (cmd=='k' || !cmd))
@ -85,12 +87,38 @@ static int remove_extradata(AVBitStreamFilterContext *bsfc, AVCodecContext *avct
return 0;
}
static int noise(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size, int keyframe){
int amount= args ? atoi(args) : 10000;
unsigned int *state= bsfc->priv_data;
int i;
*poutbuf= av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
memcpy(*poutbuf, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
for(i=0; i<buf_size; i++){
(*state) += (*poutbuf)[i] + 1;
if(*state % amount == 0)
(*poutbuf)[i] = *state;
}
return 1;
}
AVBitStreamFilter dump_extradata_bsf={
"dump_extra",
0,
dump_extradata,
};
AVBitStreamFilter remove_extradata_bsf={
"remove_extra",
0,
remove_extradata,
};
AVBitStreamFilter noise_bsf={
"noise",
sizeof(int),
noise,
};