/*
  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
  *
  * 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 <string.h>
 

 #include "avcodec.h"

 #include "bsf.h"
 
 #include "libavutil/log.h"

 #include "libavutil/mem.h"

 #include "libavutil/opt.h"
 
 enum DumpFreq {
     DUMP_FREQ_KEYFRAME,
     DUMP_FREQ_ALL,
 };
 
 typedef struct DumpExtradataContext {
     const AVClass *class;
     int freq;
 } DumpExtradataContext;
 
 static int dump_extradata(AVBSFContext *ctx, AVPacket *out)
 {
     DumpExtradataContext *s = ctx->priv_data;
     AVPacket *in;
     int ret = 0;
 
     ret = ff_bsf_get_packet(ctx, &in);
     if (ret < 0)
         return ret;
 
     if (ctx->par_in->extradata &&
         (s->freq == DUMP_FREQ_ALL ||
          (s->freq == DUMP_FREQ_KEYFRAME && in->flags & AV_PKT_FLAG_KEY))) {
         if (in->size >= INT_MAX - ctx->par_in->extradata_size) {
             ret = AVERROR(ERANGE);
             goto fail;
         }

         ret = av_new_packet(out, in->size + ctx->par_in->extradata_size);
         if (ret < 0)
             goto fail;

         ret = av_packet_copy_props(out, in);
         if (ret < 0) {
             av_packet_unref(out);
             goto fail;

         }

 
         memcpy(out->data, ctx->par_in->extradata, ctx->par_in->extradata_size);
         memcpy(out->data + ctx->par_in->extradata_size, in->data, in->size);
     } else {
         av_packet_move_ref(out, in);

     }

 
 fail:
     av_packet_free(&in);
 
     return ret;

 }
 

 #define OFFSET(x) offsetof(DumpExtradataContext, x)
 static const AVOption options[] = {
     { "freq", "When do dump extradata", OFFSET(freq), AV_OPT_TYPE_INT,
         { .i64 = DUMP_FREQ_KEYFRAME }, DUMP_FREQ_KEYFRAME, DUMP_FREQ_ALL, 0, "freq" },

         { "k",        NULL, 0, AV_OPT_TYPE_CONST, { .i64 = DUMP_FREQ_KEYFRAME }, .unit = "freq" },

         { "keyframe", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = DUMP_FREQ_KEYFRAME }, .unit = "freq" },

         { "e",        NULL, 0, AV_OPT_TYPE_CONST, { .i64 = DUMP_FREQ_ALL      }, .unit = "freq" },

         { "all",      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = DUMP_FREQ_ALL      }, .unit = "freq" },
     { NULL },
 };
 
 static const AVClass dump_extradata_class = {
     .class_name = "dump_extradata bsf",
     .item_name  = av_default_item_name,
     .option     = options,
     .version    = LIBAVUTIL_VERSION_MAJOR,
 };
 
 const AVBitStreamFilter ff_dump_extradata_bsf = {
     .name           = "dump_extra",
     .priv_data_size = sizeof(DumpExtradataContext),
     .priv_class     = &dump_extradata_class,
     .filter         = dump_extradata,

 };