/*
  * 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 "libavutil/internal.h"

 #include "libavutil/mem.h"

 #include "libavutil/opt.h"

 #if FF_API_OLD_BSF
 FF_DISABLE_DEPRECATION_WARNINGS

 AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f)

 {

     const AVBitStreamFilter *filter = NULL;
     void *opaque = NULL;
 
     while (filter != f)
         filter = av_bsf_next(&opaque);
 
     return av_bsf_next(&opaque);

 }
 

 void av_register_bitstream_filter(AVBitStreamFilter *bsf)
 {

 }
 

 typedef struct BSFCompatContext {
     AVBSFContext *ctx;

     int extradata_updated;

 } BSFCompatContext;
 

 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name)
 {

     AVBitStreamFilterContext *ctx = NULL;
     BSFCompatContext         *priv = NULL;
     const AVBitStreamFilter *bsf;
 
     bsf = av_bsf_get_by_name(name);
     if (!bsf)
         return NULL;
 
     ctx = av_mallocz(sizeof(*ctx));
     if (!ctx)
         return NULL;
 
     priv = av_mallocz(sizeof(*priv));
     if (!priv)
         goto fail;
 
 
     ctx->filter    = bsf;
     ctx->priv_data = priv;
 
     return ctx;
 
 fail:
     if (priv)
         av_bsf_free(&priv->ctx);
     av_freep(&priv);
     av_freep(&ctx);

     return NULL;
 }
 

 void av_bitstream_filter_close(AVBitStreamFilterContext *bsfc)
 {

     BSFCompatContext *priv;
 

     if (!bsfc)
         return;

 
     priv = bsfc->priv_data;

 
     av_bsf_free(&priv->ctx);

     av_freep(&bsfc->priv_data);

     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)
 {

     BSFCompatContext *priv = bsfc->priv_data;
     AVPacket pkt = { 0 };
     int ret;
 
     if (!priv->ctx) {
         ret = av_bsf_alloc(bsfc->filter, &priv->ctx);
         if (ret < 0)
             return ret;
 
         ret = avcodec_parameters_from_context(priv->ctx->par_in, avctx);
         if (ret < 0)
             return ret;
 
         priv->ctx->time_base_in = avctx->time_base;
 

         if (bsfc->args && bsfc->filter->priv_class) {
             const AVOption *opt = av_opt_next(priv->ctx->priv_data, NULL);
             const char * shorthand[2] = {NULL};
 
             if (opt)
                 shorthand[0] = opt->name;
 
             ret = av_opt_set_from_string(priv->ctx->priv_data, bsfc->args, shorthand, "=", ":");

             if (ret < 0)
                 return ret;

         }
 

         ret = av_bsf_init(priv->ctx);
         if (ret < 0)
             return ret;
     }
 
     pkt.data = buf;
     pkt.size = buf_size;
 
     ret = av_bsf_send_packet(priv->ctx, &pkt);
     if (ret < 0)
         return ret;
 
     *poutbuf      = NULL;
     *poutbuf_size = 0;
 
     ret = av_bsf_receive_packet(priv->ctx, &pkt);
     if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
         return 0;
     else if (ret < 0)
         return ret;
 
     *poutbuf = av_malloc(pkt.size + AV_INPUT_BUFFER_PADDING_SIZE);
     if (!*poutbuf) {
         av_packet_unref(&pkt);
         return AVERROR(ENOMEM);
     }
 
     *poutbuf_size = pkt.size;
     memcpy(*poutbuf, pkt.data, pkt.size);
 
     av_packet_unref(&pkt);
 
     /* drain all the remaining packets we cannot return */
     while (ret >= 0) {
         ret = av_bsf_receive_packet(priv->ctx, &pkt);
         av_packet_unref(&pkt);
     }
 

     if (!priv->extradata_updated) {
         /* update extradata in avctx from the output codec parameters */
         if (priv->ctx->par_out->extradata_size && (!args || !strstr(args, "private_spspps_buf"))) {
             av_freep(&avctx->extradata);
             avctx->extradata_size = 0;
             avctx->extradata = av_mallocz(priv->ctx->par_out->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
             if (!avctx->extradata)
                 return AVERROR(ENOMEM);
             memcpy(avctx->extradata, priv->ctx->par_out->extradata, priv->ctx->par_out->extradata_size);
             avctx->extradata_size = priv->ctx->par_out->extradata_size;
         }
 
         priv->extradata_updated = 1;
     }
 

     return 1;

 }

 FF_ENABLE_DEPRECATION_WARNINGS
 #endif