/*
  *
  * This file is part of Libav.
  *
  * Libav 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.
  *
  * Libav 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 Libav; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef AVFILTER_BUFFERSRC_H
 #define AVFILTER_BUFFERSRC_H
 
 /**
  * @file
  * Memory buffer source API.
  */
 

 #include "libavcodec/avcodec.h"

 #include "avfilter.h"
 

 enum {
 
     /**
      * Do not check for format changes.
      */
     AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT = 1,
 
     /**
      * Do not copy buffer data.
      */
     AV_BUFFERSRC_FLAG_NO_COPY = 2,
 

     /**
      * Immediately push the frame to the output.
      */
     AV_BUFFERSRC_FLAG_PUSH = 4,
 

 };
 
 /**

  * Add buffer data in picref to buffer_src.

  *
  * @param buffer_src  pointer to a buffer source context
  * @param picref      a buffer reference, or NULL to mark EOF
  * @param flags       a combination of AV_BUFFERSRC_FLAG_*
  * @return            >= 0 in case of success, a negative AVERROR code
  *                    in case of failure
  */
 int av_buffersrc_add_ref(AVFilterContext *buffer_src,
                          AVFilterBufferRef *picref, int flags);
 

 /**
  * Get the number of failed requests.
  *
  * A failed request is when the request_frame method is called while no
  * frame is present in the buffer.
  * The number is reset when a frame is added.
  */
 unsigned av_buffersrc_get_nb_failed_requests(AVFilterContext *buffer_src);
 

 #ifdef FF_API_BUFFERSRC_BUFFER

 /**

  * Add a buffer to the filtergraph s.
  *
  * @param buf buffer containing frame data to be passed down the filtergraph.
  * This function will take ownership of buf, the user must not free it.
  * A NULL buf signals EOF -- i.e. no more frames will be sent to this filter.

  * @deprecated Use av_buffersrc_add_ref(s, picref, AV_BUFFERSRC_FLAG_NO_COPY) instead.

  */

 attribute_deprecated

 int av_buffersrc_buffer(AVFilterContext *s, AVFilterBufferRef *buf);

 #endif

 
 /**

  * Add a frame to the buffer source.
  *
  * @param s an instance of the buffersrc filter.
  * @param frame frame to be added.
  *
  * @warning frame data will be memcpy()ed, which may be a big performance
  *          hit. Use av_buffersrc_buffer() to avoid copying the data.
  */

 int av_buffersrc_write_frame(AVFilterContext *s, const AVFrame *frame);

 #endif /* AVFILTER_BUFFERSRC_H */