IMB_indexer.h

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/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
 
#pragma once
 
#ifdef WIN32
#  include <io.h>
#endif
 
#include "IMB_anim.h"
#include <stdio.h>
#include <stdlib.h>
/*
 * separate animation index files to solve the following problems:
 *
 * a) different time-codes within one file (like DTS/PTS, Time-code-Track,
 *    "implicit" time-codes within DV-files and HDV-files etc.)
 * b) seeking difficulties within FFMPEG for files with timestamp holes
 * c) broken files that miss several frames / have varying framerates
 * d) use proxies accordingly
 *
 * ... we need index files, that provide us with
 *
 * the binary(!) position, where we have to seek into the file *and*
 * the continuous frame number (ignoring the holes) starting from the
 * beginning of the file, so that we know, which proxy frame to serve.
 *
 * This index has to be only built once for a file and is written into
 * the BL_proxy directory structure for later reuse in different blender files.
 */
 
typedef struct anim_index_entry {
  int frameno;
  uint64_t seek_pos;
  uint64_t seek_pos_pts;
  uint64_t seek_pos_dts;
  uint64_t pts;
} anim_index_entry;
 
struct anim_index {
  char name[1024];
 
  int num_entries;
  struct anim_index_entry *entries;
};
 
struct anim_index_builder;
 
typedef struct anim_index_builder {
  FILE *fp;
  char name[FILE_MAX];
  char temp_name[FILE_MAX];
 
  void *private_data;
 
  void (*delete_priv_data)(struct anim_index_builder *idx);
  void (*proc_frame)(struct anim_index_builder *idx,
                     unsigned char *buffer,
                     int data_size,
                     struct anim_index_entry *entry);
} anim_index_builder;
 
anim_index_builder *IMB_index_builder_create(const char *name);
void IMB_index_builder_add_entry(anim_index_builder *fp,
                                 int frameno,
                                 uint64_t seek_pos,
                                 uint64_t seek_pos_pts,
                                 uint64_t seek_pos_dts,
                                 uint64_t pts);
 
void IMB_index_builder_proc_frame(anim_index_builder *fp,
                                  unsigned char *buffer,
                                  int data_size,
                                  int frameno,
                                  uint64_t seek_pos,
                                  uint64_t seek_pos_pts,
                                  uint64_t seek_pos_dts,
                                  uint64_t pts);
 
void IMB_index_builder_finish(anim_index_builder *fp, int rollback);
 
struct anim_index *IMB_indexer_open(const char *name);
uint64_t IMB_indexer_get_seek_pos(struct anim_index *idx, int frame_index);
uint64_t IMB_indexer_get_seek_pos_pts(struct anim_index *idx, int frame_index);
uint64_t IMB_indexer_get_seek_pos_dts(struct anim_index *idx, int frame_index);
 
int IMB_indexer_get_frame_index(struct anim_index *idx, int frameno);
uint64_t IMB_indexer_get_pts(struct anim_index *idx, int frame_index);
int IMB_indexer_get_duration(struct anim_index *idx);
 
int IMB_indexer_can_scan(struct anim_index *idx, int old_frame_index, int new_frame_index);
 
void IMB_indexer_close(struct anim_index *idx);
 
void IMB_free_indices(struct anim *anim);
 
struct anim *IMB_anim_open_proxy(struct anim *anim, IMB_Proxy_Size preview_size);
struct anim_index *IMB_anim_open_index(struct anim *anim, IMB_Timecode_Type tc);
 
int IMB_proxy_size_to_array_index(IMB_Proxy_Size pr_size);
int IMB_timecode_to_array_index(IMB_Timecode_Type tc);