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  1. /*
  2.  *
  3.  * This file is part of FFmpeg.
  4.  *
  5.  * FFmpeg is free software; you can redistribute it and/or
  6.  * modify it under the terms of the GNU Lesser General Public
  7.  * License as published by the Free Software Foundation; either
  8.  * version 2.1 of the License, or (at your option) any later version.
  9.  *
  10.  * FFmpeg is distributed in the hope that it will be useful,
  11.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13.  * Lesser General Public License for more details.
  14.  *
  15.  * You should have received a copy of the GNU Lesser General Public
  16.  * License along with FFmpeg; if not, write to the Free Software
  17.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18.  */
  19.  
  20. #ifndef AVFILTER_BUFFERSRC_H
  21. #define AVFILTER_BUFFERSRC_H
  22.  
  23. /**
  24.  * @file
  25.  * Memory buffer source API.
  26.  */
  27.  
  28. #include "libavcodec/avcodec.h"
  29. #include "avfilter.h"
  30.  
  31. enum {
  32.  
  33.     /**
  34.      * Do not check for format changes.
  35.      */
  36.     AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT = 1,
  37.  
  38. #if FF_API_AVFILTERBUFFER
  39.     /**
  40.      * Ignored
  41.      */
  42.     AV_BUFFERSRC_FLAG_NO_COPY = 2,
  43. #endif
  44.  
  45.     /**
  46.      * Immediately push the frame to the output.
  47.      */
  48.     AV_BUFFERSRC_FLAG_PUSH = 4,
  49.  
  50.     /**
  51.      * Keep a reference to the frame.
  52.      * If the frame if reference-counted, create a new reference; otherwise
  53.      * copy the frame data.
  54.      */
  55.     AV_BUFFERSRC_FLAG_KEEP_REF = 8,
  56.  
  57. };
  58.  
  59. /**
  60.  * Add buffer data in picref to buffer_src.
  61.  *
  62.  * @param buffer_src  pointer to a buffer source context
  63.  * @param picref      a buffer reference, or NULL to mark EOF
  64.  * @param flags       a combination of AV_BUFFERSRC_FLAG_*
  65.  * @return            >= 0 in case of success, a negative AVERROR code
  66.  *                    in case of failure
  67.  */
  68. int av_buffersrc_add_ref(AVFilterContext *buffer_src,
  69.                          AVFilterBufferRef *picref, int flags);
  70.  
  71. /**
  72.  * Get the number of failed requests.
  73.  *
  74.  * A failed request is when the request_frame method is called while no
  75.  * frame is present in the buffer.
  76.  * The number is reset when a frame is added.
  77.  */
  78. unsigned av_buffersrc_get_nb_failed_requests(AVFilterContext *buffer_src);
  79.  
  80. #if FF_API_AVFILTERBUFFER
  81. /**
  82.  * Add a buffer to the filtergraph s.
  83.  *
  84.  * @param buf buffer containing frame data to be passed down the filtergraph.
  85.  * This function will take ownership of buf, the user must not free it.
  86.  * A NULL buf signals EOF -- i.e. no more frames will be sent to this filter.
  87.  *
  88.  * @deprecated use av_buffersrc_write_frame() or av_buffersrc_add_frame()
  89.  */
  90. attribute_deprecated
  91. int av_buffersrc_buffer(AVFilterContext *s, AVFilterBufferRef *buf);
  92. #endif
  93.  
  94. /**
  95.  * Add a frame to the buffer source.
  96.  *
  97.  * @param s an instance of the buffersrc filter.
  98.  * @param frame frame to be added. If the frame is reference counted, this
  99.  * function will make a new reference to it. Otherwise the frame data will be
  100.  * copied.
  101.  *
  102.  * @return 0 on success, a negative AVERROR on error
  103.  *
  104.  * This function is equivalent to av_buffersrc_add_frame_flags() with the
  105.  * AV_BUFFERSRC_FLAG_KEEP_REF flag.
  106.  */
  107. int av_buffersrc_write_frame(AVFilterContext *s, const AVFrame *frame);
  108.  
  109. /**
  110.  * Add a frame to the buffer source.
  111.  *
  112.  * @param s an instance of the buffersrc filter.
  113.  * @param frame frame to be added. If the frame is reference counted, this
  114.  * function will take ownership of the reference(s) and reset the frame.
  115.  * Otherwise the frame data will be copied. If this function returns an error,
  116.  * the input frame is not touched.
  117.  *
  118.  * @return 0 on success, a negative AVERROR on error.
  119.  *
  120.  * @note the difference between this function and av_buffersrc_write_frame() is
  121.  * that av_buffersrc_write_frame() creates a new reference to the input frame,
  122.  * while this function takes ownership of the reference passed to it.
  123.  *
  124.  * This function is equivalent to av_buffersrc_add_frame_flags() without the
  125.  * AV_BUFFERSRC_FLAG_KEEP_REF flag.
  126.  */
  127. int av_buffersrc_add_frame(AVFilterContext *ctx, AVFrame *frame);
  128.  
  129. /**
  130.  * Add a frame to the buffer source.
  131.  *
  132.  * By default, if the frame is reference-counted, this function will take
  133.  * ownership of the reference(s) and reset the frame. This can be controled
  134.  * using the flags.
  135.  *
  136.  * If this function returns an error, the input frame is not touched.
  137.  *
  138.  * @param buffer_src  pointer to a buffer source context
  139.  * @param frame       a frame, or NULL to mark EOF
  140.  * @param flags       a combination of AV_BUFFERSRC_FLAG_*
  141.  * @return            >= 0 in case of success, a negative AVERROR code
  142.  *                    in case of failure
  143.  */
  144. int av_buffersrc_add_frame_flags(AVFilterContext *buffer_src,
  145.                                  AVFrame *frame, int flags);
  146.  
  147.  
  148. #endif /* AVFILTER_BUFFERSRC_H */
  149.