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authorMichael Niedermayer <michaelni@gmx.at>2006-07-06 15:04:46 +0000
committerMichael Niedermayer <michaelni@gmx.at>2006-07-06 15:04:46 +0000
commit748c2fca7e4d99357c234936aa71212a6282be36 (patch)
treedd31be48f45e433c1e6b9c002553a2f4191de893 /libavcodec
parent06fcf56c50eb6194270656ac8c4fddb250b14eab (diff)
AVBitStreamFilter (some thingy which can modify the bitstream like add or remove global headers or change the headers or ...)
Originally committed as revision 5643 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec')
-rw-r--r--libavcodec/Makefile4
-rw-r--r--libavcodec/allcodecs.c3
-rw-r--r--libavcodec/avcodec.h31
-rw-r--r--libavcodec/bitstream_filter.c96
-rw-r--r--libavcodec/parser.c1
5 files changed, 134 insertions, 1 deletions
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 0e28fd3ef8..4ef24562e0 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -17,7 +17,9 @@ OBJS= bitstream.o utils.o mem.o allcodecs.o \
fft.o mdct.o raw.o golomb.o cabac.o\
dpcm.o adx.o faandct.o parser.o g726.o \
vp3dsp.o h264idct.o rangecoder.o pnm.o h263.o msmpeg4.o h263dec.o \
- opt.o
+ opt.o \
+ bitstream_filter.o \
+
HEADERS = avcodec.h
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index ef97b871d3..11d765093a 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -661,5 +661,8 @@ PCM_CODEC(CODEC_ID_ADPCM_SBPRO_2, adpcm_sbpro_2);
av_register_codec_parser(&dvbsub_parser);
#endif
av_register_codec_parser(&aac_parser);
+
+ av_register_bitstream_filter(&dump_extradata_bsf);
+ av_register_bitstream_filter(&remove_extradata_bsf);
}
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 30aad8fadf..1af9901999 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -2571,6 +2571,37 @@ extern AVCodecParser dvdsub_parser;
extern AVCodecParser dvbsub_parser;
extern AVCodecParser aac_parser;
+
+typedef struct AVBitStreamFilterContext {
+ struct AVBitStreamFilter *filter;
+ AVCodecParserContext *parser;
+ struct AVBitStreamFilterContext *next;
+} AVBitStreamFilterContext;
+
+
+typedef struct AVBitStreamFilter {
+ const char *name;
+ int (*filter)(AVBitStreamFilterContext *bsfc,
+ AVCodecContext *avctx, const char *args,
+ uint8_t **poutbuf, int *poutbuf_size,
+ const uint8_t *buf, int buf_size, int keyframe);
+ struct AVBitStreamFilter *next;
+} AVBitStreamFilter;
+
+extern AVBitStreamFilter *av_first_bitstream_filter;
+
+void av_register_bitstream_filter(AVBitStreamFilter *bsf);
+AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
+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);
+void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
+
+extern AVBitStreamFilter dump_extradata_bsf;
+extern AVBitStreamFilter remove_extradata_bsf;
+
+
/* memory */
void *av_malloc(unsigned int size);
void *av_mallocz(unsigned int size);
diff --git a/libavcodec/bitstream_filter.c b/libavcodec/bitstream_filter.c
new file mode 100644
index 0000000000..8cc75a976b
--- /dev/null
+++ b/libavcodec/bitstream_filter.c
@@ -0,0 +1,96 @@
+
+#include "avcodec.h"
+
+AVBitStreamFilter *first_bitstream_filter= NULL;
+
+void av_register_bitstream_filter(AVBitStreamFilter *bsf){
+ bsf->next = first_bitstream_filter;
+ first_bitstream_filter= bsf;
+}
+
+AVBitStreamFilterContext *av_bitstream_filter_init(const char *name){
+ AVBitStreamFilter *bsf= first_bitstream_filter;
+
+ while(bsf){
+ if(!strcmp(name, bsf->name)){
+ AVBitStreamFilterContext *bsfc= av_mallocz(sizeof(AVBitStreamFilterContext));
+ bsfc->filter= bsf;
+ return bsfc;
+ }
+ bsf= bsf->next;
+ }
+ return NULL;
+}
+
+void av_bitstream_filter_close(AVBitStreamFilterContext *bsfc){
+ av_parser_close(bsfc->parser);
+ av_free(bsfc);
+}
+
+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){
+ return bsfc->filter->filter(bsfc, avctx, args, poutbuf, poutbuf_size, buf, buf_size, keyframe);
+}
+
+static int dump_extradata(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
+ uint8_t **poutbuf, int *poutbuf_size,
+ 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))
+ ||(cmd=='e')
+ /*||(? && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_BEGIN)*/){
+ int size= buf_size + avctx->extradata_size;
+ *poutbuf_size= size;
+ *poutbuf= av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
+
+ memcpy(*poutbuf, avctx->extradata, avctx->extradata_size);
+ memcpy((*poutbuf) + avctx->extradata_size, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
+ return 1;
+ }
+ }
+ return 0;
+}
+
+static int remove_extradata(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
+ uint8_t **poutbuf, int *poutbuf_size,
+ const uint8_t *buf, int buf_size, int keyframe){
+ int cmd= args ? *args : 0;
+ AVCodecParserContext *s;
+
+ if(!bsfc->parser){
+ bsfc->parser= av_parser_init(avctx->codec_id);
+ }
+ s= bsfc->parser;
+
+ if(s && s->parser->split){
+ if( (((avctx->flags & CODEC_FLAG_GLOBAL_HEADER) || (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER)) && cmd=='a')
+ ||(!keyframe && cmd=='k')
+ ||(cmd=='e' || !cmd)
+ ){
+ int i= s->parser->split(avctx, buf, buf_size);
+ buf += i;
+ buf_size -= i;
+ }
+ }
+ *poutbuf= (uint8_t *) buf;
+ *poutbuf_size= buf_size;
+
+ return 0;
+}
+
+AVBitStreamFilter dump_extradata_bsf={
+ "dump_extra",
+ dump_extradata,
+};
+
+AVBitStreamFilter remove_extradata_bsf={
+ "remove_extra",
+ remove_extradata,
+};
diff --git a/libavcodec/parser.c b/libavcodec/parser.c
index 1977dd4943..4944b3a9fc 100644
--- a/libavcodec/parser.c
+++ b/libavcodec/parser.c
@@ -145,6 +145,7 @@ int av_parser_parse(AVCodecParserContext *s,
/**
*
* @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
+ * @deprecated use AVBitstreamFilter
*/
int av_parser_change(AVCodecParserContext *s,
AVCodecContext *avctx,