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  1. /*
  2.  * Mpeg video formats-related defines and utility functions
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #ifndef AVCODEC_MPEGPICTURE_H
  22. #define AVCODEC_MPEGPICTURE_H
  23.  
  24. #include <stdint.h>
  25.  
  26. #include "libavutil/frame.h"
  27.  
  28. #include "avcodec.h"
  29. #include "motion_est.h"
  30. #include "thread.h"
  31.  
  32. #define MAX_PICTURE_COUNT 36
  33. #define EDGE_WIDTH 16
  34.  
  35. typedef struct ScratchpadContext {
  36.     uint8_t *edge_emu_buffer;     ///< temporary buffer for if MVs point to out-of-frame data
  37.     uint8_t *rd_scratchpad;       ///< scratchpad for rate distortion mb decision
  38.     uint8_t *obmc_scratchpad;
  39.     uint8_t *b_scratchpad;        ///< scratchpad used for writing into write only buffers
  40. } ScratchpadContext;
  41.  
  42. /**
  43.  * Picture.
  44.  */
  45. typedef struct Picture {
  46.     struct AVFrame *f;
  47.     ThreadFrame tf;
  48.  
  49.     AVBufferRef *qscale_table_buf;
  50.     int8_t *qscale_table;
  51.  
  52.     AVBufferRef *motion_val_buf[2];
  53.     int16_t (*motion_val[2])[2];
  54.  
  55.     AVBufferRef *mb_type_buf;
  56.     uint32_t *mb_type;          ///< types and macros are defined in mpegutils.h
  57.  
  58.     AVBufferRef *mbskip_table_buf;
  59.     uint8_t *mbskip_table;
  60.  
  61.     AVBufferRef *ref_index_buf[2];
  62.     int8_t *ref_index[2];
  63.  
  64.     AVBufferRef *mb_var_buf;
  65.     uint16_t *mb_var;           ///< Table for MB variances
  66.  
  67.     AVBufferRef *mc_mb_var_buf;
  68.     uint16_t *mc_mb_var;        ///< Table for motion compensated MB variances
  69.  
  70.     int alloc_mb_width;         ///< mb_width used to allocate tables
  71.     int alloc_mb_height;        ///< mb_height used to allocate tables
  72.  
  73.     AVBufferRef *mb_mean_buf;
  74.     uint8_t *mb_mean;           ///< Table for MB luminance
  75.  
  76.     AVBufferRef *hwaccel_priv_buf;
  77.     void *hwaccel_picture_private; ///< Hardware accelerator private data
  78.  
  79.     int field_picture;          ///< whether or not the picture was encoded in separate fields
  80.  
  81.     int64_t mb_var_sum;         ///< sum of MB variance for current frame
  82.     int64_t mc_mb_var_sum;      ///< motion compensated MB variance for current frame
  83.  
  84.     int b_frame_score;
  85.     int needs_realloc;          ///< Picture needs to be reallocated (eg due to a frame size change)
  86.  
  87.     int reference;
  88.     int shared;
  89.  
  90.     uint64_t error[AV_NUM_DATA_POINTERS];
  91. } Picture;
  92.  
  93. /**
  94.  * Allocate a Picture.
  95.  * The pixels are allocated/set by calling get_buffer() if shared = 0.
  96.  */
  97. int ff_alloc_picture(AVCodecContext *avctx, Picture *pic, MotionEstContext *me,
  98.                      ScratchpadContext *sc, int shared, int encoding,
  99.                      int chroma_x_shift, int chroma_y_shift, int out_format,
  100.                      int mb_stride, int mb_width, int mb_height, int b8_stride,
  101.                      ptrdiff_t *linesize, ptrdiff_t *uvlinesize);
  102.  
  103. int ff_mpeg_framesize_alloc(AVCodecContext *avctx, MotionEstContext *me,
  104.                             ScratchpadContext *sc, int linesize);
  105.  
  106. int ff_mpeg_ref_picture(AVCodecContext *avctx, Picture *dst, Picture *src);
  107. void ff_mpeg_unref_picture(AVCodecContext *avctx, Picture *picture);
  108.  
  109. void ff_free_picture_tables(Picture *pic);
  110. int ff_update_picture_tables(Picture *dst, Picture *src);
  111.  
  112. int ff_find_unused_picture(AVCodecContext *avctx, Picture *picture, int shared);
  113.  
  114. #endif /* AVCODEC_MPEGPICTURE_H */
  115.