/*
  * 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 "libavutil/log.h"
 #include "libavutil/opt.h"
 

 #include "avcodec.h"

 #include "bsf.h"

 enum RemoveFreq {
     REMOVE_FREQ_KEYFRAME,
     REMOVE_FREQ_ALL,

     REMOVE_FREQ_NONKEYFRAME,

 };

 typedef struct RemoveExtradataContext {
     const AVClass *class;
     int freq;

     AVCodecParserContext *parser;
     AVCodecContext *avctx;
 } RemoveExtradataContext;
 
 static int remove_extradata(AVBSFContext *ctx, AVPacket *out)
 {
     RemoveExtradataContext *s = ctx->priv_data;
 
     AVPacket *in;
     int ret;
 
     ret = ff_bsf_get_packet(ctx, &in);
     if (ret < 0)
         return ret;
 
     if (s->parser && s->parser->parser->split) {
         if (s->freq == REMOVE_FREQ_ALL ||

             (s->freq == REMOVE_FREQ_NONKEYFRAME && !(in->flags & AV_PKT_FLAG_KEY)) ||

             (s->freq == REMOVE_FREQ_KEYFRAME && in->flags & AV_PKT_FLAG_KEY)) {
             int i = s->parser->parser->split(s->avctx, in->data, in->size);
             in->data += i;
             in->size -= i;

         }
     }

 
     av_packet_move_ref(out, in);
     av_packet_free(&in);

 
     return 0;
 }
 

 static int remove_extradata_init(AVBSFContext *ctx)
 {
     RemoveExtradataContext *s = ctx->priv_data;
     int ret;
 
     s->parser = av_parser_init(ctx->par_in->codec_id);
 
     if (s->parser) {
         s->avctx = avcodec_alloc_context3(NULL);
         if (!s->avctx)
             return AVERROR(ENOMEM);
 
         ret = avcodec_parameters_to_context(s->avctx, ctx->par_in);
         if (ret < 0)
             return ret;
     }
 
     return 0;
 }
 
 static void remove_extradata_close(AVBSFContext *ctx)
 {
     RemoveExtradataContext *s = ctx->priv_data;
 
     avcodec_free_context(&s->avctx);
     av_parser_close(s->parser);
 }
 
 #define OFFSET(x) offsetof(RemoveExtradataContext, x)
 static const AVOption options[] = {

     { "freq", NULL, OFFSET(freq), AV_OPT_TYPE_INT, { .i64 = REMOVE_FREQ_KEYFRAME }, REMOVE_FREQ_KEYFRAME, REMOVE_FREQ_NONKEYFRAME, 0, "freq" },

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

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

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

         { "all",      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE_FREQ_ALL      }, .unit = "freq" },
     { NULL },
 };
 
 static const AVClass remove_extradata_class = {
     .class_name = "remove_extradata",
     .item_name  = av_default_item_name,
     .option     = options,
     .version    = LIBAVUTIL_VERSION_INT,
 };
 
 const AVBitStreamFilter ff_remove_extradata_bsf = {
     .name           = "remove_extra",
     .priv_data_size = sizeof(RemoveExtradataContext),
     .priv_class     = &remove_extradata_class,
     .init           = remove_extradata_init,
     .close          = remove_extradata_close,
     .filter         = remove_extradata,

 };