/*
  * 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
  */
 

 #ifndef AVFILTER_BUFFERSINK_H
 #define AVFILTER_BUFFERSINK_H

 
 /**
  * @file

  * memory buffer sink API for audio and video

  */
 
 #include "avfilter.h"
 
 /**

  * Struct to use for initializing a buffersink context.

  */

 typedef struct {

     const enum AVPixelFormat *pixel_fmts; ///< list of allowed pixel formats, terminated by AV_PIX_FMT_NONE

 } AVBufferSinkParams;

 
 /**

  * Create an AVBufferSinkParams structure.

  *

  * Must be freed with av_free().
  */
 AVBufferSinkParams *av_buffersink_params_alloc(void);
 
 /**
  * Struct to use for initializing an abuffersink context.
  */
 typedef struct {
     const enum AVSampleFormat *sample_fmts; ///< list of allowed sample formats, terminated by AV_SAMPLE_FMT_NONE
     const int64_t *channel_layouts;         ///< list of allowed channel layouts, terminated by -1

     const int *channel_counts;              ///< list of allowed channel counts, terminated by -1
     int all_channel_counts;                 ///< if not 0, accept any channel count or layout

     int *sample_rates;                      ///< list of allowed sample rates, terminated by -1

 } AVABufferSinkParams;
 
 /**
  * Create an AVABufferSinkParams structure.
  *
  * Must be freed with av_free().
  */
 AVABufferSinkParams *av_abuffersink_params_alloc(void);
 
 /**

  * Set the frame size for an audio buffer sink.
  *
  * All calls to av_buffersink_get_buffer_ref will return a buffer with
  * exactly the specified number of samples, or AVERROR(EAGAIN) if there is
  * not enough. The last buffer at EOF will be padded with 0.
  */
 void av_buffersink_set_frame_size(AVFilterContext *ctx, unsigned frame_size);
 
 /**

  * Tell av_buffersink_get_buffer_ref() to read video/samples buffer
  * reference, but not remove it from the buffer. This is useful if you
  * need only to read a video/samples buffer, without to fetch it.
  */
 #define AV_BUFFERSINK_FLAG_PEEK 1
 
 /**

  * Tell av_buffersink_get_buffer_ref() not to request a frame from its input.

  * If a frame is already buffered, it is read (and removed from the buffer),
  * but if no frame is present, return AVERROR(EAGAIN).
  */
 #define AV_BUFFERSINK_FLAG_NO_REQUEST 2
 
 /**

  * Get an audio/video buffer data from buffer_sink and put it in bufref.
  *
  * This function works with both audio and video buffer sinks.
  *
  * @param buffer_sink pointer to a buffersink or abuffersink context
  * @param flags a combination of AV_BUFFERSINK_FLAG_* flags

  * @return >= 0 in case of success, a negative AVERROR code in case of
  * failure
  */

 int av_buffersink_get_buffer_ref(AVFilterContext *buffer_sink,
                                  AVFilterBufferRef **bufref, int flags);
 

 
 /**
  * Get the number of immediately available frames.
  */
 int av_buffersink_poll_frame(AVFilterContext *ctx);
 

 /**

  * Get the frame rate of the input.
  */
 AVRational av_buffersink_get_frame_rate(AVFilterContext *ctx);
 
 /**
  * @defgroup libav_api Libav API
  * @{
  */
 
 /**

  * Get a buffer with filtered data from sink and put it in buf.
  *

  * @param ctx pointer to a context of a buffersink or abuffersink AVFilter.

  * @param buf pointer to the buffer will be written here if buf is non-NULL. buf
  *            must be freed by the caller using avfilter_unref_buffer().
  *            Buf may also be NULL to query whether a buffer is ready to be
  *            output.
  *
  * @return >= 0 in case of success, a negative AVERROR code in case of
  *         failure.
  */

 int av_buffersink_read(AVFilterContext *ctx, AVFilterBufferRef **buf);

 /**
  * Same as av_buffersink_read, but with the ability to specify the number of
  * samples read. This function is less efficient than av_buffersink_read(),
  * because it copies the data around.
  *

  * @param ctx pointer to a context of the abuffersink AVFilter.

  * @param buf pointer to the buffer will be written here if buf is non-NULL. buf
  *            must be freed by the caller using avfilter_unref_buffer(). buf
  *            will contain exactly nb_samples audio samples, except at the end
  *            of stream, when it can contain less than nb_samples.
  *            Buf may also be NULL to query whether a buffer is ready to be
  *            output.
  *
  * @warning do not mix this function with av_buffersink_read(). Use only one or
  * the other with a single sink, not both.
  */
 int av_buffersink_read_samples(AVFilterContext *ctx, AVFilterBufferRef **buf,
                                int nb_samples);
 

 /**

  * @}

  */
 

 #endif /* AVFILTER_BUFFERSINK_H */