research.m1stereo.tv/gitweb/ - melted/blob - src/modules/kino/producer_kino.c

   1 /*
   2  * producer_kino.c -- a DV file format parser
   3  * Copyright (C) 2005 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program 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
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include <stdlib.h>
  22 #include "producer_kino.h"
  23 #include <framework/mlt_frame.h>
  24 #include <framework/mlt_deque.h>
  25 #include <framework/mlt_factory.h>
  26 #include "kino_wrapper.h"
  27
  28 /* NB: This is an abstract producer - it provides no codec support whatsoever. */
  29
  30 #define FRAME_SIZE_525_60       10 * 150 * 80
  31 #define FRAME_SIZE_625_50       12 * 150 * 80
  32
  33 typedef struct producer_kino_s *producer_kino;
  34
  35 struct producer_kino_s
  36 {
  37         struct mlt_producer_s parent;
  38         kino_wrapper wrapper;
  39 };
  40
  41 static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int index );
  42 static void producer_close( mlt_producer parent );
  43
  44 mlt_producer producer_kino_init( char *filename )
  45 {
  46         kino_wrapper wrapper = kino_wrapper_init( );
  47
  48         if ( kino_wrapper_open( wrapper, filename ) )
  49         {
  50                 producer_kino this = calloc( sizeof( struct producer_kino_s ), 1 );
  51
  52                 if ( this != NULL && mlt_producer_init( &this->parent, this ) == 0 )
  53                 {
  54                         mlt_producer producer = &this->parent;
  55                         mlt_properties properties = MLT_PRODUCER_PROPERTIES( producer );
  56                         double fps = kino_wrapper_is_pal( wrapper ) ? 25 : 30000.0 / 1001.0;
  57
  58                         // Assign the wrapper
  59                         this->wrapper = wrapper;
  60
  61                         // Pass wrapper properties (frame rate, count etc)
  62                         mlt_properties_set_position( properties, "length", kino_wrapper_get_frame_count( wrapper ) );
  63                         mlt_properties_set_position( properties, "in", 0 );
  64                         mlt_properties_set_position( properties, "out", kino_wrapper_get_frame_count( wrapper ) - 1 );
  65                         mlt_properties_set_double( properties, "real_fps", fps );
  66
  67                         // Register transport implementation with the producer
  68                         producer->close = ( mlt_destructor )producer_close;
  69
  70                         // Register our get_frame implementation with the producer
  71                         producer->get_frame = producer_get_frame;
  72
  73                         // Return the producer
  74                         return producer;
  75                 }
  76                 free( this );
  77         }
  78
  79         kino_wrapper_close( wrapper );
  80
  81         return NULL;
  82 }
  83
  84 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
  85 {
  86         producer_kino this = producer->child;
  87         uint8_t *data = mlt_pool_alloc( FRAME_SIZE_625_50 );
  88
  89         // Obtain the current frame number
  90         uint64_t position = mlt_producer_frame( producer );
  91
  92         // Create an empty frame
  93         *frame = mlt_frame_init( );
  94
  95         // Seek and fetch
  96         if ( kino_wrapper_get_frame( this->wrapper, data, position ) )
  97         {
  98                 // Get the frames properties
  99                 mlt_properties properties = MLT_FRAME_PROPERTIES( *frame );
 100
 101                 // Determine if we're PAL or NTSC
 102                 int is_pal = kino_wrapper_is_pal( this->wrapper );
 103
 104                 // Pass the dv data
 105                 mlt_properties_set_data( properties, "dv_data", data, FRAME_SIZE_625_50, ( mlt_destructor )mlt_pool_release, NULL );
 106
 107                 // Update other info on the frame
 108                 mlt_properties_set_int( properties, "width", 720 );
 109                 mlt_properties_set_int( properties, "height", is_pal ? 576 : 480 );
 110                 mlt_properties_set_int( properties, "top_field_first", is_pal ? 0 : ( data[ 5 ] & 0x07 ) == 0 ? 0 : 1 );
 111         }
 112         else
 113         {
 114                 mlt_pool_release( data );
 115         }
 116
 117         // Update timecode on the frame we're creating
 118         mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
 119
 120         // Calculate the next timecode
 121         mlt_producer_prepare_next( producer );
 122
 123         return 0;
 124 }
 125
 126 static void producer_close( mlt_producer parent )
 127 {
 128         if ( parent != NULL )
 129         {
 130                 // Obtain this
 131                 producer_kino this = parent->child;
 132
 133                 // Close the file
 134                 if ( this != NULL )
 135                         kino_wrapper_close( this->wrapper );
 136
 137                 // Close the parent
 138                 parent->close = NULL;
 139                 mlt_producer_close( parent );
 140
 141                 // Free the memory
 142                 free( this );
 143         }
 144 }