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[mlt] / src / modules / dv / producer_libdv.c
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 <stdlib.h>
24 #include <string.h>
25 #include <stdio.h>
26 #include <libdv/dv.h>
27 #include <unistd.h>
28 #include <sys/types.h>
29 #include <sys/stat.h>
30 #include <fcntl.h>
31
32 typedef struct producer_libdv_s *producer_libdv;
33
34 struct producer_libdv_s
35 {
36         struct mlt_producer_s parent;
37         int fd;
38         dv_decoder_t *dv_decoder;
39         int is_pal;
40         uint64_t file_size;
41         int frame_size;
42         long frames_in_file;
43 };
44
45 static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int index );
46 static void producer_close( mlt_producer parent );
47
48 static int producer_collect_info( producer_libdv this );
49
50 mlt_producer producer_libdv_init( char *filename )
51 {
52         producer_libdv this = calloc( sizeof( struct producer_libdv_s ), 1 );
53
54         if ( filename != NULL && this != NULL && mlt_producer_init( &this->parent, this ) == 0 )
55         {
56                 mlt_producer producer = &this->parent;
57                 mlt_properties properties = mlt_producer_properties( producer );
58
59                 // Register transport implementation with the producer
60                 producer->close = producer_close;
61
62                 // Register our get_frame implementation with the producer
63                 producer->get_frame = producer_get_frame;
64
65                 // Create the dv_decoder
66                 this->dv_decoder = dv_decoder_new( FALSE, FALSE, FALSE );
67                 this->dv_decoder->quality = DV_QUALITY_BEST;
68                 this->dv_decoder->audio->arg_audio_emphasis = 2;
69                 dv_set_audio_correction( this->dv_decoder, DV_AUDIO_CORRECT_AVERAGE );
70
71                 // Open the file if specified
72                 this->fd = open( filename, O_RDONLY );
73
74                 // Collect info
75                 if ( this->fd != -1 && producer_collect_info( this ) )
76                 {
77                         // Set the resource property (required for all producers)
78                         mlt_properties_set( properties, "resource", filename );
79                 }
80                 else
81                 {
82                         // Reject this file
83                         mlt_producer_close( producer );
84                         producer = NULL;
85                 }
86
87                 // Return the producer
88                 return producer;
89         }
90         free( this );
91         return NULL;
92 }
93
94 static int read_frame( int fd, uint8_t* frame_buf, int *isPAL )
95 {
96         int result = read( fd, frame_buf, frame_size_525_60 ) == frame_size_525_60;
97         if ( result )
98         {
99                 *isPAL = ( frame_buf[3] & 0x80 );
100
101                 if ( *isPAL )
102                 {
103                         int diff = frame_size_625_50 - frame_size_525_60;
104                         result = read( fd, frame_buf + frame_size_525_60, diff ) == diff;
105                 }
106         }
107         
108         return result;
109 }
110
111 static int producer_collect_info( producer_libdv this )
112 {
113         int valid = 0;
114         // IRRIGATE ME
115         uint8_t *dv_data = malloc( frame_size_625_50 );
116
117         if ( dv_data != NULL )
118         {
119                 // Read the first frame
120                 valid = read_frame( this->fd, dv_data, &this->is_pal );
121
122                 // If it looks like a valid frame, the get stats
123                 if ( valid )
124                 {
125                         // Get the properties
126                         mlt_properties properties = mlt_producer_properties( &this->parent );
127
128                         // Determine the file size
129                         struct stat buf;
130                         fstat( this->fd, &buf );
131
132                         // Store the file size
133                         this->file_size = buf.st_size;
134
135                         // Determine the frame size
136                         this->frame_size = this->is_pal ? frame_size_625_50 : frame_size_525_60;
137
138                         // Determine the number of frames in the file
139                         this->frames_in_file = this->file_size / this->frame_size;
140
141                         // Calculate default in/out points
142                         double fps = this->is_pal ? 25 : 30000.0 / 1001.0;
143                         if ( mlt_properties_get_double( properties, "fps" ) == fps )
144                         {
145                                 mlt_properties_set_position( properties, "length", this->frames_in_file );
146                                 mlt_properties_set_position( properties, "in", 0 );
147                                 mlt_properties_set_position( properties, "out", this->frames_in_file - 1 );
148                         }
149                         else
150                         {
151                                 valid = 0;
152                         }
153
154                         // Parse the header for meta info
155                         dv_parse_header( this->dv_decoder, dv_data );
156                         mlt_properties_set_double( properties, "aspect_ratio", dv_format_wide( this->dv_decoder ) ? 16.0/9.0 : 4.0/3.0 );
157                 }
158
159                 free( dv_data );
160         }
161
162         return valid;
163 }
164
165 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
166 {
167         int pitches[3] = { 0, 0, 0 };
168         uint8_t *pixels[3] = { NULL, NULL, NULL };
169         
170         // Get the frames properties
171         mlt_properties properties = mlt_frame_properties( this );
172
173         // Get the dv decoder
174         dv_decoder_t *decoder = mlt_properties_get_data( properties, "dv_decoder", NULL );
175
176         // Get the dv data
177         uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );
178
179         // Parse the header for meta info
180         dv_parse_header( decoder, dv_data );
181         
182         // Assign width and height from properties
183         *width = mlt_properties_get_int( properties, "width" );
184         *height = mlt_properties_get_int( properties, "height" );
185
186         // Extract an image of the format requested
187         if ( *format == mlt_image_yuv422 )
188         {
189                 // Allocate an image
190                 // IRRIGATE ME
191                 uint8_t *image = malloc( *width * ( *height + 1 ) * 2 );
192
193                 // Pass to properties for clean up
194                 mlt_properties_set_data( properties, "image", image, *width * ( *height + 1 ) * 2, free, NULL );
195
196                 // Decode the image
197                 pitches[ 0 ] = *width * 2;
198                 pixels[ 0 ] = image;
199                 dv_decode_full_frame( decoder, dv_data, e_dv_color_yuv, pixels, pitches );
200
201                 // Assign result
202                 *buffer = image;
203         }
204         else if ( *format == mlt_image_rgb24 )
205         {
206                 // Allocate an image
207                 // IRRIGATE ME
208                 uint8_t *image = malloc( *width * ( *height + 1 ) * 3 );
209
210                 // Pass to properties for clean up
211                 mlt_properties_set_data( properties, "image", image, *width * ( *height + 1 ) * 3, free, NULL );
212
213                 // Decode the frame
214                 pitches[ 0 ] = 720 * 3;
215                 pixels[ 0 ] = image;
216                 dv_decode_full_frame( decoder, dv_data, e_dv_color_rgb, pixels, pitches );
217
218                 // Assign result
219                 *buffer = image;
220         }
221
222         return 0;
223 }
224
225 static int producer_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
226 {
227         int16_t *p;
228         int i, j;
229         int16_t *audio_channels[ 4 ];
230         
231         // Get the frames properties
232         mlt_properties properties = mlt_frame_properties( this );
233
234         // Get the dv decoder
235         dv_decoder_t *decoder = mlt_properties_get_data( properties, "dv_decoder", NULL );
236
237         // Get the dv data
238         uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );
239
240         // Parse the header for meta info
241         dv_parse_header( decoder, dv_data );
242
243         // Obtain required values
244         //fprintf( stderr, "libdv: frequency %d\n", decoder->audio->frequency );
245         *frequency = decoder->audio->frequency;
246         *samples = decoder->audio->samples_this_frame;
247         *channels = decoder->audio->num_channels;
248
249         // Create a temporary workspace
250         for ( i = 0; i < 4; i++ )
251                 audio_channels[ i ] = malloc( DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
252
253         // Create a workspace for the result
254         *buffer = malloc( *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
255
256         // Pass the allocated audio buffer as a property
257         mlt_properties_set_data( properties, "audio", *buffer, *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ), free, NULL );
258
259         // Decode the audio
260         dv_decode_full_audio( decoder, dv_data, audio_channels );
261         
262         // Interleave the audio
263         p = *buffer;
264         for ( i = 0; i < *samples; i++ )
265                 for ( j = 0; j < *channels; j++ )
266                         *p++ = audio_channels[ j ][ i ];
267
268         // Free the temporary work space
269         for ( i = 0; i < 4; i++ )
270                 free( audio_channels[ i ] );
271
272         return 0;
273 }
274
275 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
276 {
277         producer_libdv this = producer->child;
278         uint8_t *data = malloc( frame_size_625_50 );
279         
280         // Obtain the current frame number
281         uint64_t position = mlt_producer_frame( producer );
282         
283         // Convert timecode to a file position (ensuring that we're on a frame boundary)
284         uint64_t offset = position * this->frame_size;
285
286         // Create an empty frame
287         *frame = mlt_frame_init( );
288
289         // Seek and fetch
290         if ( this->fd != 0 && 
291                  lseek( this->fd, offset, SEEK_SET ) == offset &&
292                  read_frame( this->fd, data, &this->is_pal ) )
293         {
294                 // Get the frames properties
295                 mlt_properties properties = mlt_frame_properties( *frame );
296
297                 // Pass the dv decoder
298                 mlt_properties_set_data( properties, "dv_decoder", this->dv_decoder, 0, NULL, NULL );
299
300                 // Pass the dv data
301                 mlt_properties_set_data( properties, "dv_data", data, frame_size_625_50, free, NULL );
302
303                 // Update other info on the frame
304                 mlt_properties_set_int( properties, "width", 720 );
305                 mlt_properties_set_int( properties, "height", this->is_pal ? 576 : 480 );
306                 mlt_properties_set_int( properties, "top_field_first", 0 );
307                 
308                 // Parse the header for meta info
309                 dv_parse_header( this->dv_decoder, data );
310                 mlt_properties_set_int( properties, "progressive", dv_is_progressive( this->dv_decoder ) );
311                 mlt_properties_set_double( properties, "aspect_ratio", dv_format_wide( this->dv_decoder ) ? 16.0/9.0 : 4.0/3.0 );
312
313                 // Hmm - register audio callback
314                 ( *frame )->get_audio = producer_get_audio;
315                 
316                 // Push the get_image method on to the stack
317                 mlt_frame_push_get_image( *frame, producer_get_image );
318         }
319         else
320         {
321                 free( data );
322         }
323
324         // Update timecode on the frame we're creating
325         mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
326
327         // Calculate the next timecode
328         mlt_producer_prepare_next( producer );
329
330         return 0;
331 }
332
333 static void producer_close( mlt_producer parent )
334 {
335         // Obtain this
336         producer_libdv this = parent->child;
337
338         // Free the dv deconder
339         //dv_decoder_free( this->dv_decoder );
340
341         // Close the file
342         if ( this->fd > 0 )
343                 close( this->fd );
344
345         // Close the parent
346         parent->close = NULL;
347         mlt_producer_close( parent );
348
349         // Free the memory
350         free( this );
351 }
352