#include "producer_libdv.h"
#include <framework/mlt_frame.h>
+#include <framework/mlt_deque.h>
+#include <framework/mlt_factory.h>
+#include <pthread.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <sys/stat.h>
#include <fcntl.h>
+/** To conserve resources, we maintain a stack of dv decoders.
+*/
+
+static pthread_mutex_t decoder_lock = PTHREAD_MUTEX_INITIALIZER;
+static mlt_properties dv_decoders = NULL;
+
+dv_decoder_t *dv_decoder_alloc( )
+{
+ // We'll return a dv_decoder
+ dv_decoder_t *this = NULL;
+
+ // Lock the mutex
+ pthread_mutex_lock( &decoder_lock );
+
+ // Create the properties if necessary
+ if ( dv_decoders == NULL )
+ {
+ // Create the properties
+ dv_decoders = mlt_properties_new( );
+
+ // Create the stack
+ mlt_properties_set_data( dv_decoders, "stack", mlt_deque_init( ), 0, ( mlt_destructor )mlt_deque_close, NULL );
+
+ // Register the properties for clean up
+ mlt_factory_register_for_clean_up( dv_decoders, ( mlt_destructor )mlt_properties_close );
+ }
+
+ // Now try to obtain a decoder
+ if ( dv_decoders != NULL )
+ {
+ // Obtain the stack
+ mlt_deque stack = mlt_properties_get_data( dv_decoders, "stack", NULL );
+
+ // Pop the top of the stack
+ this = mlt_deque_pop_back( stack );
+
+ // Create a new decoder if none available
+ if ( this == NULL )
+ {
+ // We'll need a unique property ID for this
+ char label[ 256 ];
+
+ // Configure the decoder
+ this = dv_decoder_new( FALSE, FALSE, FALSE );
+ this->quality = DV_QUALITY_COLOR | DV_QUALITY_AC_1;
+ this->audio->arg_audio_emphasis = 2;
+ dv_set_audio_correction( this, DV_AUDIO_CORRECT_AVERAGE );
+
+ // Register it with the properties to ensure clean up
+ sprintf( label, "%p", this );
+ mlt_properties_set_data( dv_decoders, label, this, 0, ( mlt_destructor )dv_decoder_free, NULL );
+ }
+ }
+
+ // Unlock the mutex
+ pthread_mutex_unlock( &decoder_lock );
+
+ return this;
+}
+
+void dv_decoder_return( dv_decoder_t *this )
+{
+ // Lock the mutex
+ pthread_mutex_lock( &decoder_lock );
+
+ // Now try to return the decoder
+ if ( dv_decoders != NULL )
+ {
+ // Obtain the stack
+ mlt_deque stack = mlt_properties_get_data( dv_decoders, "stack", NULL );
+
+ // Push it back
+ mlt_deque_push_back( stack, this );
+ }
+
+ // Unlock the mutex
+ pthread_mutex_unlock( &decoder_lock );
+}
+
+
typedef struct producer_libdv_s *producer_libdv;
struct producer_libdv_s
{
struct mlt_producer_s parent;
int fd;
- dv_decoder_t *dv_decoder;
int is_pal;
uint64_t file_size;
int frame_size;
// Register our get_frame implementation with the producer
producer->get_frame = producer_get_frame;
- // Create the dv_decoder
- this->dv_decoder = dv_decoder_new( FALSE, FALSE, FALSE );
- this->dv_decoder->quality = DV_QUALITY_BEST;
- this->dv_decoder->audio->arg_audio_emphasis = 2;
- dv_set_audio_correction( this->dv_decoder, DV_AUDIO_CORRECT_AVERAGE );
-
// Open the file if specified
this->fd = open( filename, O_RDONLY );
// Get the properties
mlt_properties properties = mlt_producer_properties( &this->parent );
+ // Get a dv_decoder
+ dv_decoder_t *dv_decoder = dv_decoder_alloc( );
+
// Determine the file size
struct stat buf;
fstat( this->fd, &buf );
}
// Parse the header for meta info
- dv_parse_header( this->dv_decoder, dv_data );
- mlt_properties_set_double( properties, "aspect_ratio", dv_format_wide( this->dv_decoder ) ? 16.0/9.0 : 4.0/3.0 );
+ dv_parse_header( dv_decoder, dv_data );
+ mlt_properties_set_double( properties, "aspect_ratio",
+ dv_format_wide( dv_decoder ) ? ( this->is_pal ? 512.0/351.0 : 96.0/79.0 ) : ( this->is_pal ? 128.0/117.0 : 72.0/79.0 ) );
+
+ // Return the decoder
+ dv_decoder_return( dv_decoder );
}
mlt_pool_release( dv_data );
// Get the frames properties
mlt_properties properties = mlt_frame_properties( this );
- // Get the dv decoder
- dv_decoder_t *decoder = mlt_properties_get_data( properties, "dv_decoder", NULL );
+ // Get a dv_decoder
+ dv_decoder_t *decoder = dv_decoder_alloc( );
// Get the dv data
uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );
+ // Get and set the quality request
+ char *quality = mlt_frame_pop_service( this );
+
+ if ( quality != NULL )
+ {
+ if ( strncmp( quality, "fast", 4 ) == 0 )
+ decoder->quality = ( DV_QUALITY_COLOR | DV_QUALITY_DC );
+ else if ( strncmp( quality, "best", 4 ) == 0 )
+ decoder->quality = ( DV_QUALITY_COLOR | DV_QUALITY_AC_2 );
+ else
+ decoder->quality = ( DV_QUALITY_COLOR | DV_QUALITY_AC_1 );
+ }
+
// Parse the header for meta info
dv_parse_header( decoder, dv_data );
*buffer = image;
}
+ // Return the decoder
+ dv_decoder_return( decoder );
+
return 0;
}
// Get the frames properties
mlt_properties properties = mlt_frame_properties( this );
- // Get the dv decoder
- dv_decoder_t *decoder = mlt_properties_get_data( properties, "dv_decoder", NULL );
+ // Get a dv_decoder
+ dv_decoder_t *decoder = dv_decoder_alloc( );
// Get the dv data
uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );
// Parse the header for meta info
dv_parse_header( decoder, dv_data );
- // Obtain required values
- //fprintf( stderr, "libdv: frequency %d\n", decoder->audio->frequency );
- *frequency = decoder->audio->frequency;
- *samples = decoder->audio->samples_this_frame;
- *channels = decoder->audio->num_channels;
-
- // Create a temporary workspace
- for ( i = 0; i < 4; i++ )
- audio_channels[ i ] = mlt_pool_alloc( DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
-
- // Create a workspace for the result
- *buffer = mlt_pool_alloc( *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
-
- // Pass the allocated audio buffer as a property
- mlt_properties_set_data( properties, "audio", *buffer, *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ), ( mlt_destructor )mlt_pool_release, NULL );
-
- // Decode the audio
- dv_decode_full_audio( decoder, dv_data, audio_channels );
+ // Check that we have audio
+ if ( decoder->audio->num_channels > 0 )
+ {
+ // Obtain required values
+ *frequency = decoder->audio->frequency;
+ *samples = decoder->audio->samples_this_frame;
+ *channels = decoder->audio->num_channels;
+
+ // Create a temporary workspace
+ for ( i = 0; i < 4; i++ )
+ audio_channels[ i ] = mlt_pool_alloc( DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
+
+ // Create a workspace for the result
+ *buffer = mlt_pool_alloc( *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
+
+ // Pass the allocated audio buffer as a property
+ mlt_properties_set_data( properties, "audio", *buffer, *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ), ( mlt_destructor )mlt_pool_release, NULL );
- // Interleave the audio
- p = *buffer;
- for ( i = 0; i < *samples; i++ )
- for ( j = 0; j < *channels; j++ )
- *p++ = audio_channels[ j ][ i ];
+ // Decode the audio
+ dv_decode_full_audio( decoder, dv_data, audio_channels );
+
+ // Interleave the audio
+ p = *buffer;
+ for ( i = 0; i < *samples; i++ )
+ for ( j = 0; j < *channels; j++ )
+ *p++ = audio_channels[ j ][ i ];
+
+ // Free the temporary work space
+ for ( i = 0; i < 4; i++ )
+ mlt_pool_release( audio_channels[ i ] );
+ }
+ else
+ {
+ // No audio available on the frame, so get test audio (silence)
+ this->get_audio = NULL;
+ mlt_frame_get_audio( this, buffer, format, frequency, channels, samples );
+ }
- // Free the temporary work space
- for ( i = 0; i < 4; i++ )
- mlt_pool_release( audio_channels[ i ] );
+ // Return the decoder
+ dv_decoder_return( decoder );
return 0;
}
// Get the frames properties
mlt_properties properties = mlt_frame_properties( *frame );
- // Pass the dv decoder
- mlt_properties_set_data( properties, "dv_decoder", this->dv_decoder, 0, NULL, NULL );
+ // Get a dv_decoder
+ dv_decoder_t *dv_decoder = dv_decoder_alloc( );
// Pass the dv data
mlt_properties_set_data( properties, "dv_data", data, frame_size_625_50, ( mlt_destructor )mlt_pool_release, NULL );
mlt_properties_set_int( properties, "width", 720 );
mlt_properties_set_int( properties, "height", this->is_pal ? 576 : 480 );
mlt_properties_set_int( properties, "top_field_first", 0 );
-
+
// Parse the header for meta info
- dv_parse_header( this->dv_decoder, data );
- mlt_properties_set_int( properties, "progressive", dv_is_progressive( this->dv_decoder ) );
- mlt_properties_set_double( properties, "aspect_ratio", dv_format_wide( this->dv_decoder ) ? 16.0/9.0 : 4.0/3.0 );
+ dv_parse_header( dv_decoder, data );
+ mlt_properties_set_int( properties, "progressive", dv_is_progressive( dv_decoder ) );
+ mlt_properties_set_double( properties, "aspect_ratio",
+ dv_format_wide( dv_decoder ) ? ( this->is_pal ? 512.0/351.0 : 96.0/79.0 ) : ( this->is_pal ? 128.0/117.0 : 72.0/79.0 ) );
// Hmm - register audio callback
( *frame )->get_audio = producer_get_audio;
-
+
+ // Push the quality string
+ mlt_frame_push_service( *frame, mlt_properties_get( mlt_producer_properties( producer ), "quality" ) );
+
// Push the get_image method on to the stack
mlt_frame_push_get_image( *frame, producer_get_image );
+
+ // Return the decoder
+ dv_decoder_return( dv_decoder );
}
else
{
// Obtain this
producer_libdv this = parent->child;
- // Free the dv deconder
- //dv_decoder_free( this->dv_decoder );
-
// Close the file
if ( this->fd > 0 )
close( this->fd );
// Free the memory
free( this );
}
-
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