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

ffmpeg.c

@@ -250,6 +250,9 @@ const char **opt_names=NULL;
 int opt_name_count=0;
 AVCodecContext *avctx_opts;
 
+static AVBitStreamFilterContext *video_bitstream_filters=NULL;
+static AVBitStreamFilterContext *audio_bitstream_filters=NULL;
+static AVBitStreamFilterContext *bitstream_filters[MAX_FILES][MAX_STREAMS];
 
 #define DEFAULT_PASS_LOGFILENAME "ffmpeg2pass"
 
@@ -445,6 +448,25 @@ get_sync_ipts(const AVOutputStream *ost)
     return (double)(ist->pts + input_files_ts_offset[ist->file_index] - start_time)/AV_TIME_BASE;
 }
 
+static void write_frame(AVFormatContext *s, AVPacket *pkt, AVCodecContext *avctx, AVBitStreamFilterContext *bsfc){
+    while(bsfc){
+        AVPacket new_pkt= *pkt;
+        int a= av_bitstream_filter_filter(bsfc, avctx, NULL,
+                                          &new_pkt.data, &new_pkt.size,
+                                          pkt->data, pkt->size,
+                                          pkt->flags & PKT_FLAG_KEY);
+        if(a){
+            av_free_packet(pkt);
+            new_pkt.destruct= av_destruct_packet;
+        }
+        *pkt= new_pkt;
+
+        bsfc= bsfc->next;
+    }
+
+    av_interleaved_write_frame(s, pkt);
+}
+
 #define MAX_AUDIO_PACKET_SIZE (128 * 1024)
 
 static void do_audio_out(AVFormatContext *s,
@@ -548,7 +570,7 @@ static void do_audio_out(AVFormatContext *s,
             if(enc->coded_frame && enc->coded_frame->pts != AV_NOPTS_VALUE)
                 pkt.pts= av_rescale_q(enc->coded_frame->pts, enc->time_base, ost->st->time_base);
             pkt.flags |= PKT_FLAG_KEY;
-            av_interleaved_write_frame(s, &pkt);
+            write_frame(s, &pkt, ost->st->codec, bitstream_filters[ost->file_index][pkt.stream_index]);
 
             ost->sync_opts += enc->frame_size;
         }
@@ -592,7 +614,7 @@ static void do_audio_out(AVFormatContext *s,
         if(enc->coded_frame && enc->coded_frame->pts != AV_NOPTS_VALUE)
             pkt.pts= av_rescale_q(enc->coded_frame->pts, enc->time_base, ost->st->time_base);
         pkt.flags |= PKT_FLAG_KEY;
-        av_interleaved_write_frame(s, &pkt);
+        write_frame(s, &pkt, ost->st->codec, bitstream_filters[ost->file_index][pkt.stream_index]);
     }
 }
 
@@ -691,7 +713,7 @@ static void do_subtitle_out(AVFormatContext *s,
             else
                 pkt.pts += 90 * sub->end_display_time;
         }
-        av_interleaved_write_frame(s, &pkt);
+        write_frame(s, &pkt, ost->st->codec, bitstream_filters[ost->file_index][pkt.stream_index]);
     }
 }
 
@@ -853,7 +875,7 @@ static void do_video_out(AVFormatContext *s,
             if(dec->coded_frame && dec->coded_frame->key_frame)
                 pkt.flags |= PKT_FLAG_KEY;
 
-            av_interleaved_write_frame(s, &pkt);
+            write_frame(s, &pkt, ost->st->codec, bitstream_filters[ost->file_index][pkt.stream_index]);
             enc->coded_frame = old_frame;
         } else {
             AVFrame big_picture;
@@ -896,7 +918,7 @@ static void do_video_out(AVFormatContext *s,
 
                 if(enc->coded_frame && enc->coded_frame->key_frame)
                     pkt.flags |= PKT_FLAG_KEY;
-                av_interleaved_write_frame(s, &pkt);
+                write_frame(s, &pkt, ost->st->codec, bitstream_filters[ost->file_index][pkt.stream_index]);
                 *frame_size = ret;
                 //fprintf(stderr,"\nFrame: %3d %3d size: %5d type: %d",
                 //        enc->frame_number-1, enc->real_pict_num, ret,
@@ -1317,9 +1339,12 @@ static int output_packet(AVInputStream *ist, int ist_index,
                                 opkt.dts= av_rescale_q(dts + input_files_ts_offset[ist->file_index], AV_TIME_BASE_Q,  ost->st->time_base);
                             }
                             opkt.flags= pkt->flags;
+
+                            //FIXME remove the following 2 lines they shall be replaced by the bitstream filters
                             if(av_parser_change(ist->st->parser, ost->st->codec, &opkt.data, &opkt.size, data_buf, data_size, pkt->flags & PKT_FLAG_KEY))
                                 opkt.destruct= av_destruct_packet;
-                            av_interleaved_write_frame(os, &opkt);
+
+                            write_frame(os, &opkt, ost->st->codec, bitstream_filters[ost->file_index][pkt->stream_index]);
                             ost->st->codec->frame_number++;
                             ost->frame_number++;
                             av_free_packet(&opkt);
@@ -1401,7 +1426,7 @@ static int output_packet(AVInputStream *ist, int ist_index,
                         pkt.size= ret;
                         if(enc->coded_frame && enc->coded_frame->pts != AV_NOPTS_VALUE)
                             pkt.pts= av_rescale_q(enc->coded_frame->pts, enc->time_base, ost->st->time_base);
-                        av_interleaved_write_frame(os, &pkt);
+                        write_frame(os, &pkt, ost->st->codec, bitstream_filters[ost->file_index][pkt.stream_index]);
                     }
                 }
             }
@@ -2980,6 +3005,9 @@ static void new_video_stream(AVFormatContext *oc)
         fprintf(stderr, "Could not alloc stream\n");
         exit(1);
     }
+    bitstream_filters[nb_output_files][oc->nb_streams - 1]= video_bitstream_filters;
+    video_bitstream_filters= NULL;
+
 #if defined(HAVE_THREADS)
     if(thread_count>1)
         avcodec_thread_init(st->codec, thread_count);
@@ -3179,6 +3207,10 @@ static void new_audio_stream(AVFormatContext *oc)
         fprintf(stderr, "Could not alloc stream\n");
         exit(1);
     }
+
+    bitstream_filters[nb_output_files][oc->nb_streams - 1]= audio_bitstream_filters;
+    audio_bitstream_filters= NULL;
+
 #if defined(HAVE_THREADS)
     if(thread_count>1)
         avcodec_thread_init(st->codec, thread_count);
@@ -3885,6 +3917,41 @@ static void opt_target(const char *arg)
     }
 }
 
+static void opt_video_bsf(const char *arg)
+{
+    AVBitStreamFilterContext *bsfc= av_bitstream_filter_init(arg); //FIXME split name and args for filter at '='
+    AVBitStreamFilterContext **bsfp;
+
+    if(!bsfc){
+        fprintf(stderr, "Unkown bitstream filter %s\n", arg);
+        exit(1);
+    }
+
+    bsfp= &video_bitstream_filters;
+    while(*bsfp)
+        bsfp= &(*bsfp)->next;
+
+    *bsfp= bsfc;
+}
+
+//FIXME avoid audio - video code duplication
+static void opt_audio_bsf(const char *arg)
+{
+    AVBitStreamFilterContext *bsfc= av_bitstream_filter_init(arg); //FIXME split name and args for filter at '='
+    AVBitStreamFilterContext **bsfp;
+
+    if(!bsfc){
+        fprintf(stderr, "Unkown bitstream filter %s\n", arg);
+        exit(1);
+    }
+
+    bsfp= &audio_bitstream_filters;
+    while(*bsfp)
+        bsfp= &(*bsfp)->next;
+
+    *bsfp= bsfc;
+}
+
 static void show_version(void)
 {
     /* TODO: add function interface to avutil and avformat */
@@ -4069,6 +4136,10 @@ const OptionDef options[] = {
     { "packetsize", OPT_INT | HAS_ARG | OPT_EXPERT, {(void*)&mux_packet_size}, "set packet size", "size" },
     { "muxdelay", OPT_FLOAT | HAS_ARG | OPT_EXPERT, {(void*)&mux_max_delay}, "set the maximum demux-decode delay", "seconds" },
     { "muxpreload", OPT_FLOAT | HAS_ARG | OPT_EXPERT, {(void*)&mux_preload}, "set the initial demux-decode delay", "seconds" },
+
+    { "absf", HAS_ARG | OPT_AUDIO | OPT_EXPERT, {(void*)opt_audio_bsf}, "", "bitstream filter" },
+    { "vbsf", HAS_ARG | OPT_VIDEO | OPT_EXPERT, {(void*)opt_video_bsf}, "", "bitstream filter" },
+
     { "default", OPT_FUNC2 | HAS_ARG | OPT_AUDIO | OPT_VIDEO | OPT_EXPERT, {(void*)opt_default}, "generic catch all option", "" },
     { NULL, },
 };

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
 

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);
 }
 

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);

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,
+};

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,