+/*
+ typedef struct
+ {
+ int64_t i_file_offset;
+ int32_t i_keyframe_number;
+ } seektable_entry_t;
+ typedef struct
+ {
+ int32_t i_adjust;
+ int32_t i_keyframe_number;
+ } kfatable_entry_t;
+*/
+
+static int SeekTableLoad( demux_t *p_demux, demux_sys_t *p_sys )
+{
+ frame_header_t fh;
+ int64_t i_original_pos;
+ int64_t i_time, i_offset;
+ int keyframe, last_keyframe = 0, frame = 0, kfa_entry_id = 0;
+
+ if( p_sys->exh.i_seektable_offset <= 0 )
+ return VLC_SUCCESS;
+
+ /* Save current position */
+ i_original_pos = stream_Tell( p_demux->s );
+#if 0
+ msg_Dbg( p_demux, "current offset %"PRIi64, i_original_pos );
+
+ msg_Dbg( p_demux, "seeking in stream to %"PRIi64, p_sys->exh.i_seektable_offset );
+#endif
+ if( stream_Seek( p_demux->s, p_sys->exh.i_seektable_offset ) )
+ return VLC_EGENERIC;
+
+ if( FrameHeaderLoad( p_demux, &fh ) )
+ return VLC_EGENERIC;
+
+ if( fh.i_type != 'Q' )
+ {
+ msg_Warn( p_demux, "invalid seektable, frame type=%c", fh.i_type );
+ stream_Seek( p_demux->s, i_original_pos );
+ return VLC_EGENERIC;
+ }
+
+ /* */
+ uint8_t *p_seek_table = malloc( fh.i_length );
+ if( p_seek_table == NULL )
+ return VLC_ENOMEM;
+
+ if( stream_Read( p_demux->s, p_seek_table, fh.i_length ) != fh.i_length )
+ {
+ free( p_seek_table );
+ return VLC_EGENERIC;
+ }
+ const int32_t i_seek_elements = fh.i_length / 12;
+
+ /* Get keyframe adjust offsets */
+ int32_t i_kfa_elements;
+ uint8_t *p_kfa_table;
+
+ if( p_sys->exh.i_keyframe_adjust_offset > 0 )
+ {
+ msg_Dbg( p_demux, "seeking in stream to %"PRIi64, p_sys->exh.i_keyframe_adjust_offset );
+ if( stream_Seek( p_demux->s, p_sys->exh.i_keyframe_adjust_offset ) )
+ {
+ free( p_seek_table );
+ return VLC_EGENERIC;
+ }
+
+ if( FrameHeaderLoad( p_demux, &fh ) )
+ {
+ free( p_seek_table );
+ return VLC_EGENERIC;
+ }
+
+ if( fh.i_type == 'K' && fh.i_length >= 8 )
+ {
+ p_kfa_table = malloc( fh.i_length );
+
+ if( p_kfa_table == NULL )
+ {
+ free( p_seek_table );
+ return VLC_ENOMEM;
+ }
+
+ if( stream_Read( p_demux->s, p_kfa_table, fh.i_length ) != fh.i_length )
+ {
+ free( p_seek_table );
+ free( p_kfa_table );
+ return VLC_EGENERIC;
+ }
+
+ i_kfa_elements = fh.i_length / 8;
+ }
+ }
+ else
+ {
+ i_kfa_elements = 0;
+ }
+
+
+ if( i_kfa_elements > 0 )
+ msg_Warn( p_demux, "untested keyframe adjust support, upload samples" );
+
+ for( int32_t j = 0; j < i_seek_elements; j++)
+ {
+#if 0
+ uint8_t* p = p_seek_table + j * 12;
+ msg_Dbg( p_demux, "%x %x %x %x %x %x %x %x %x %x %x %x",
+ p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8], p[9], p[10], p[11]);
+#endif
+ keyframe = GetDWLE( p_seek_table + j * 12 + 8 );
+
+ frame += (keyframe - last_keyframe) * p_sys->hdr.i_keyframe_distance;
+
+ if( kfa_entry_id < i_kfa_elements && *(int32_t*)(p_kfa_table + kfa_entry_id * 12 + 4) == j )
+ {
+ frame -= *(int32_t*)(p_kfa_table + kfa_entry_id * 12);
+ msg_Dbg( p_demux, "corrected keyframe %d with current frame number %d (corrected with %d)",
+ keyframe, frame, *(int32_t*)(p_kfa_table + kfa_entry_id * 12) );
+ kfa_entry_id++;
+ }
+
+ i_time = (double)( (int64_t)frame * 1000000 ) / p_sys->hdr.d_fps;
+ i_offset = GetQWLE( p_seek_table + j * 12 );
+
+ if( i_offset == 0 && i_time != 0 )
+ msg_Dbg( p_demux, "invalid file offset %d %"PRIi64, keyframe, i_offset );
+ else
+ {
+ demux_IndexAppend( &p_sys->idx, i_time , i_offset );
+#if 0
+ msg_Dbg( p_demux, "adding entry position %d %"PRIi64 " file offset %"PRIi64, keyframe, i_time, i_offset );
+#endif
+ }
+
+ last_keyframe = keyframe;
+ }
+
+ p_sys->i_total_frames = (int64_t)frame;
+
+ p_sys->b_index = true;
+
+ p_sys->i_total_length = p_sys->i_total_frames * 1000000 / p_sys->hdr.d_fps;
+
+ msg_Dbg( p_demux, "index table loaded (%d elements)", i_seek_elements );
+
+ if( i_kfa_elements )
+ free ( p_kfa_table );
+
+ free ( p_seek_table );
+
+ /* Restore stream position */
+ if( stream_Seek( p_demux->s, i_original_pos ) )
+ return VLC_EGENERIC;
+
+ return VLC_SUCCESS;
+
+}
+