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1 /*
2  * producer_libdv.c -- simple libdv test case
3  * Copyright (C) 2003-2004 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 "producer_libdv.h"
22 #include <framework/mlt_frame.h>
23 #include <framework/mlt_deque.h>
24 #include <framework/mlt_factory.h>
25 #include <pthread.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <stdio.h>
29 #include <libdv/dv.h>
30 #include <unistd.h>
31 #include <sys/types.h>
32 #include <sys/stat.h>
33 #include <fcntl.h>
34
35 /** To conserve resources, we maintain a stack of dv decoders.
36 */
37
38 static pthread_mutex_t decoder_lock = PTHREAD_MUTEX_INITIALIZER;
39 static mlt_properties dv_decoders = NULL;
40
41 dv_decoder_t *dv_decoder_alloc( )
42 {
43         // We'll return a dv_decoder
44         dv_decoder_t *this = NULL;
45
46         // Lock the mutex
47         pthread_mutex_lock( &decoder_lock );
48
49         // Create the properties if necessary
50         if ( dv_decoders == NULL )
51         {
52                 // Create the properties
53                 dv_decoders = mlt_properties_new( );
54
55                 // Create the stack
56                 mlt_properties_set_data( dv_decoders, "stack", mlt_deque_init( ), 0, ( mlt_destructor )mlt_deque_close, NULL );
57
58                 // Register the properties for clean up
59                 mlt_factory_register_for_clean_up( dv_decoders, ( mlt_destructor )mlt_properties_close );
60         }
61
62         // Now try to obtain a decoder
63         if ( dv_decoders != NULL )
64         {
65                 // Obtain the stack
66                 mlt_deque stack = mlt_properties_get_data( dv_decoders, "stack", NULL );
67
68                 // Pop the top of the stack
69                 this = mlt_deque_pop_back( stack );
70
71                 // Create a new decoder if none available
72                 if ( this == NULL )
73                 {
74                         // We'll need a unique property ID for this
75                         char label[ 256 ];
76
77                         // Configure the decoder
78                         this = dv_decoder_new( FALSE, FALSE, FALSE );
79                         this->quality = DV_QUALITY_COLOR | DV_QUALITY_AC_2;
80                         this->audio->arg_audio_emphasis = 2;
81                         dv_set_audio_correction( this, DV_AUDIO_CORRECT_AVERAGE );
82
83                         // Register it with the properties to ensure clean up
84                         sprintf( label, "%p", this );
85                         mlt_properties_set_data( dv_decoders, label, this, 0, ( mlt_destructor )dv_decoder_free, NULL );
86                 }
87         }
88
89         // Unlock the mutex
90         pthread_mutex_unlock( &decoder_lock );
91
92         return this;
93 }
94
95 void dv_decoder_return( dv_decoder_t *this )
96 {
97         // Lock the mutex
98         pthread_mutex_lock( &decoder_lock );
99
100         // Now try to return the decoder
101         if ( dv_decoders != NULL )
102         {
103                 // Obtain the stack
104                 mlt_deque stack = mlt_properties_get_data( dv_decoders, "stack", NULL );
105
106                 // Push it back
107                 mlt_deque_push_back( stack, this );
108         }
109
110         // Unlock the mutex
111         pthread_mutex_unlock( &decoder_lock );
112 }
113
114
115 typedef struct producer_libdv_s *producer_libdv;
116
117 struct producer_libdv_s
118 {
119         struct mlt_producer_s parent;
120         int fd;
121         int is_pal;
122         uint64_t file_size;
123         int frame_size;
124         long frames_in_file;
125 };
126
127 static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int index );
128 static void producer_close( mlt_producer parent );
129
130 static int producer_collect_info( producer_libdv this );
131
132 mlt_producer producer_libdv_init( char *filename )
133 {
134         producer_libdv this = calloc( sizeof( struct producer_libdv_s ), 1 );
135
136         if ( filename != NULL && this != NULL && mlt_producer_init( &this->parent, this ) == 0 )
137         {
138                 mlt_producer producer = &this->parent;
139                 mlt_properties properties = mlt_producer_properties( producer );
140
141                 // Register transport implementation with the producer
142                 producer->close = ( mlt_destructor )producer_close;
143
144                 // Register our get_frame implementation with the producer
145                 producer->get_frame = producer_get_frame;
146
147                 // Open the file if specified
148                 this->fd = open( filename, O_RDONLY );
149
150                 // Collect info
151                 if ( this->fd != -1 && producer_collect_info( this ) )
152                 {
153                         // Set the resource property (required for all producers)
154                         mlt_properties_set( properties, "resource", filename );
155                 }
156                 else
157                 {
158                         // Reject this file
159                         mlt_producer_close( producer );
160                         producer = NULL;
161                 }
162
163                 // Return the producer
164                 return producer;
165         }
166         free( this );
167         return NULL;
168 }
169
170 static int read_frame( int fd, uint8_t* frame_buf, int *isPAL )
171 {
172         int result = read( fd, frame_buf, FRAME_SIZE_525_60 ) == FRAME_SIZE_525_60;
173         if ( result )
174         {
175                 *isPAL = ( frame_buf[3] & 0x80 );
176
177                 if ( *isPAL )
178                 {
179                         int diff = FRAME_SIZE_625_50 - FRAME_SIZE_525_60;
180                         result = read( fd, frame_buf + FRAME_SIZE_525_60, diff ) == diff;
181                 }
182         }
183         
184         return result;
185 }
186
187 static int producer_collect_info( producer_libdv this )
188 {
189         int valid = 0;
190
191         uint8_t *dv_data = mlt_pool_alloc( FRAME_SIZE_625_50 );
192
193         if ( dv_data != NULL )
194         {
195                 // Read the first frame
196                 valid = read_frame( this->fd, dv_data, &this->is_pal );
197
198                 // If it looks like a valid frame, the get stats
199                 if ( valid )
200                 {
201                         // Get the properties
202                         mlt_properties properties = mlt_producer_properties( &this->parent );
203
204                         // Get a dv_decoder
205                         dv_decoder_t *dv_decoder = dv_decoder_alloc( );
206
207                         // Determine the file size
208                         struct stat buf;
209                         fstat( this->fd, &buf );
210
211                         // Store the file size
212                         this->file_size = buf.st_size;
213
214                         // Determine the frame size
215                         this->frame_size = this->is_pal ? FRAME_SIZE_625_50 : FRAME_SIZE_525_60;
216
217                         // Determine the number of frames in the file
218                         this->frames_in_file = this->file_size / this->frame_size;
219
220                         // Calculate default in/out points
221                         double fps = this->is_pal ? 25 : 30000.0 / 1001.0;
222                         if ( mlt_properties_get_double( properties, "fps" ) == fps )
223                         {
224                                 if ( this->frames_in_file > 0 )
225                                 {
226                                         mlt_properties_set_position( properties, "length", this->frames_in_file );
227                                         mlt_properties_set_position( properties, "in", 0 );
228                                         mlt_properties_set_position( properties, "out", this->frames_in_file - 1 );
229                                 }
230                         }
231                         else
232                         {
233                                 valid = 0;
234                         }
235
236                         // Parse the header for meta info
237                         dv_parse_header( dv_decoder, dv_data );
238                         mlt_properties_set_double( properties, "aspect_ratio", 
239                                 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 ) );
240
241                         // Return the decoder
242                         dv_decoder_return( dv_decoder );
243                 }
244
245                 mlt_pool_release( dv_data );
246         }
247
248         return valid;
249 }
250
251 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
252 {
253         int pitches[3] = { 0, 0, 0 };
254         uint8_t *pixels[3] = { NULL, NULL, NULL };
255         
256         // Get the frames properties
257         mlt_properties properties = mlt_frame_properties( this );
258
259         // Get a dv_decoder
260         dv_decoder_t *decoder = dv_decoder_alloc( );
261
262         // Get the dv data
263         uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );
264
265         // Get and set the quality request
266         char *quality = mlt_frame_pop_service( this );
267
268         if ( quality != NULL )
269         {
270                 if ( strncmp( quality, "fast", 4 ) == 0 )
271                         decoder->quality = ( DV_QUALITY_COLOR | DV_QUALITY_DC );
272                 else if ( strncmp( quality, "best", 4 ) == 0 )
273                         decoder->quality = ( DV_QUALITY_COLOR | DV_QUALITY_AC_2 );
274                 else
275                         decoder->quality = ( DV_QUALITY_COLOR | DV_QUALITY_AC_1 );
276         }
277
278         // Parse the header for meta info
279         dv_parse_header( decoder, dv_data );
280         
281         // Assign width and height from properties
282         *width = mlt_properties_get_int( properties, "width" );
283         *height = mlt_properties_get_int( properties, "height" );
284
285         // Extract an image of the format requested
286         if ( *format == mlt_image_yuv422 )
287         {
288                 // Allocate an image
289                 uint8_t *image = mlt_pool_alloc( *width * ( *height + 1 ) * 2 );
290
291                 // Pass to properties for clean up
292                 mlt_properties_set_data( properties, "image", image, *width * ( *height + 1 ) * 2, ( mlt_destructor )mlt_pool_release, NULL );
293
294                 // Decode the image
295                 pitches[ 0 ] = *width * 2;
296                 pixels[ 0 ] = image;
297                 dv_decode_full_frame( decoder, dv_data, e_dv_color_yuv, pixels, pitches );
298
299                 // Assign result
300                 *buffer = image;
301         }
302         else if ( *format == mlt_image_rgb24 )
303         {
304                 // Allocate an image
305                 uint8_t *image = mlt_pool_alloc( *width * ( *height + 1 ) * 3 );
306
307                 // Pass to properties for clean up
308                 mlt_properties_set_data( properties, "image", image, *width * ( *height + 1 ) * 3, ( mlt_destructor )mlt_pool_release, NULL );
309
310                 // Decode the frame
311                 pitches[ 0 ] = 720 * 3;
312                 pixels[ 0 ] = image;
313                 dv_decode_full_frame( decoder, dv_data, e_dv_color_rgb, pixels, pitches );
314
315                 // Assign result
316                 *buffer = image;
317         }
318
319         // Return the decoder
320         dv_decoder_return( decoder );
321
322         return 0;
323 }
324
325 static int producer_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
326 {
327         int16_t *p;
328         int i, j;
329         int16_t *audio_channels[ 4 ];
330         
331         // Get the frames properties
332         mlt_properties properties = mlt_frame_properties( this );
333
334         // Get a dv_decoder
335         dv_decoder_t *decoder = dv_decoder_alloc( );
336
337         // Get the dv data
338         uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );
339
340         // Parse the header for meta info
341         dv_parse_header( decoder, dv_data );
342
343         // Check that we have audio
344         if ( decoder->audio->num_channels > 0 )
345         {
346                 // Obtain required values
347                 *frequency = decoder->audio->frequency;
348                 *samples = decoder->audio->samples_this_frame;
349                 *channels = decoder->audio->num_channels;
350
351                 // Create a temporary workspace
352                 for ( i = 0; i < 4; i++ )
353                         audio_channels[ i ] = mlt_pool_alloc( DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
354         
355                 // Create a workspace for the result
356                 *buffer = mlt_pool_alloc( *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
357         
358                 // Pass the allocated audio buffer as a property
359                 mlt_properties_set_data( properties, "audio", *buffer, *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ), ( mlt_destructor )mlt_pool_release, NULL );
360         
361                 // Decode the audio
362                 dv_decode_full_audio( decoder, dv_data, audio_channels );
363                 
364                 // Interleave the audio
365                 p = *buffer;
366                 for ( i = 0; i < *samples; i++ )
367                         for ( j = 0; j < *channels; j++ )
368                                 *p++ = audio_channels[ j ][ i ];
369         
370                 // Free the temporary work space
371                 for ( i = 0; i < 4; i++ )
372                         mlt_pool_release( audio_channels[ i ] );
373         }
374         else
375         {
376                 // No audio available on the frame, so get test audio (silence)
377                 this->get_audio = NULL;
378                 mlt_frame_get_audio( this, buffer, format, frequency, channels, samples );
379         }
380
381         // Return the decoder
382         dv_decoder_return( decoder );
383
384         return 0;
385 }
386
387 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
388 {
389         producer_libdv this = producer->child;
390         uint8_t *data = mlt_pool_alloc( FRAME_SIZE_625_50 );
391         
392         // Obtain the current frame number
393         uint64_t position = mlt_producer_frame( producer );
394         
395         // Convert timecode to a file position (ensuring that we're on a frame boundary)
396         uint64_t offset = position * this->frame_size;
397
398         // Create an empty frame
399         *frame = mlt_frame_init( );
400
401         // Seek and fetch
402         if ( this->fd != 0 && 
403                  lseek( this->fd, offset, SEEK_SET ) == offset &&
404                  read_frame( this->fd, data, &this->is_pal ) )
405         {
406                 // Get the frames properties
407                 mlt_properties properties = mlt_frame_properties( *frame );
408
409                 // Get a dv_decoder
410                 dv_decoder_t *dv_decoder = dv_decoder_alloc( );
411
412                 // Pass the dv data
413                 mlt_properties_set_data( properties, "dv_data", data, FRAME_SIZE_625_50, ( mlt_destructor )mlt_pool_release, NULL );
414
415                 // Update other info on the frame
416                 mlt_properties_set_int( properties, "width", 720 );
417                 mlt_properties_set_int( properties, "height", this->is_pal ? 576 : 480 );
418                 mlt_properties_set_int( properties, "top_field_first", !this->is_pal ? 0 : ( data[ 5 ] & 0x07 ) == 0 ? 0 : 1 );
419
420                 // Parse the header for meta info
421                 dv_parse_header( dv_decoder, data );
422                 //mlt_properties_set_int( properties, "progressive", dv_is_progressive( dv_decoder ) );
423                 mlt_properties_set_double( properties, "aspect_ratio", 
424                         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 ) );
425
426                 // Hmm - register audio callback
427                 ( *frame )->get_audio = producer_get_audio;
428
429                 // Push the quality string
430                 mlt_frame_push_service( *frame, mlt_properties_get( mlt_producer_properties( producer ), "quality" ) );
431
432                 // Push the get_image method on to the stack
433                 mlt_frame_push_get_image( *frame, producer_get_image );
434
435                 // Return the decoder
436                 dv_decoder_return( dv_decoder );
437         }
438         else
439         {
440                 mlt_pool_release( data );
441         }
442
443         // Update timecode on the frame we're creating
444         mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
445
446         // Calculate the next timecode
447         mlt_producer_prepare_next( producer );
448
449         return 0;
450 }
451
452 static void producer_close( mlt_producer parent )
453 {
454         // Obtain this
455         producer_libdv this = parent->child;
456
457         // Close the file
458         if ( this->fd > 0 )
459                 close( this->fd );
460
461         // Close the parent
462         parent->close = NULL;
463         mlt_producer_close( parent );
464
465         // Free the memory
466         free( this );
467 }