]> git.sesse.net Git - mlt/blob - src/modules/dv/producer_libdv.c
miracle part 1
[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                 producer_collect_info( this );
74
75                 // Set the resource property (required for all producers)
76                 mlt_properties_set( properties, "resource", filename );
77
78                 // Return the producer
79                 return producer;
80         }
81         free( this );
82         return NULL;
83 }
84
85 static int read_frame( int fd, uint8_t* frame_buf, int *isPAL )
86 {
87         int result = read( fd, frame_buf, frame_size_525_60 ) == frame_size_525_60;
88         if ( result )
89         {
90                 *isPAL = ( frame_buf[3] & 0x80 );
91
92                 if ( *isPAL )
93                 {
94                         int diff = frame_size_625_50 - frame_size_525_60;
95                         result = read( fd, frame_buf + frame_size_525_60, diff ) == diff;
96                 }
97         }
98         
99         return result;
100 }
101
102 static int producer_collect_info( producer_libdv this )
103 {
104         int valid = 0;
105         uint8_t *dv_data = malloc( frame_size_625_50 );
106
107         if ( dv_data != NULL )
108         {
109                 // Read the first frame
110                 valid = read_frame( this->fd, dv_data, &this->is_pal );
111
112                 // If it looks like a valid frame, the get stats
113                 if ( valid )
114                 {
115                         // Get the properties
116                         mlt_properties properties = mlt_producer_properties( &this->parent );
117
118                         // Determine the file size
119                         struct stat buf;
120                         fstat( this->fd, &buf );
121
122                         // Store the file size
123                         this->file_size = buf.st_size;
124
125                         // Determine the frame size
126                         this->frame_size = this->is_pal ? frame_size_625_50 : frame_size_525_60;
127
128                         // Determine the number of frames in the file
129                         this->frames_in_file = this->file_size / this->frame_size;
130
131                         // Calculate default in/out points
132                         double fps = this->is_pal ? 25 : 30000 / 1001;
133                         mlt_timecode length = ( mlt_timecode )( this->frames_in_file ) / fps;
134                         mlt_properties_set_double( properties, "fps", fps );
135                         mlt_properties_set_timecode( properties, "length", length );
136                         mlt_properties_set_timecode( properties, "in", 0.0 );
137                         mlt_properties_set_timecode( properties, "out", length );
138
139                         // Set the speed to normal
140                         mlt_properties_set_double( properties, "speed", 1 );
141                 }
142
143                 free( dv_data );
144         }
145
146         return valid;
147 }
148
149 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
150 {
151         int pitches[3] = { 0, 0, 0 };
152         uint8_t *pixels[3] = { NULL, NULL, NULL };
153         
154         // Get the frames properties
155         mlt_properties properties = mlt_frame_properties( this );
156
157         // Get the dv decoder
158         dv_decoder_t *decoder = mlt_properties_get_data( properties, "dv_decoder", NULL );
159
160         // Get the dv data
161         uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );
162
163         // Assign width and height from properties
164         *width = mlt_properties_get_int( properties, "width" );
165         *height = mlt_properties_get_int( properties, "height" );
166
167         // Extract an image of the format requested
168         if ( *format == mlt_image_yuv422 )
169         {
170                 // Allocate an image
171                 uint8_t *image = malloc( *width * *height * 2 );
172
173                 // Pass to properties for clean up
174                 mlt_properties_set_data( properties, "image", image, *width * *height * 2, free, NULL );
175
176                 // Decode the image
177                 pitches[ 0 ] = *width * 2;
178                 pixels[ 0 ] = image;
179                 dv_decode_full_frame( decoder, dv_data, e_dv_color_yuv, pixels, pitches );
180
181                 // Assign result
182                 *buffer = image;
183         }
184         else if ( *format == mlt_image_rgb24 )
185         {
186                 // Allocate an image
187                 uint8_t *image = malloc( *width * *height * 3 );
188
189                 // Pass to properties for clean up
190                 mlt_properties_set_data( properties, "image", image, *width * *height * 3, free, NULL );
191
192                 // Decode the frame
193                 pitches[ 0 ] = 720 * 3;
194                 pixels[ 0 ] = image;
195                 dv_decode_full_frame( decoder, dv_data, e_dv_color_rgb, pixels, pitches );
196
197                 // Assign result
198                 *buffer = image;
199         }
200
201         return 0;
202 }
203
204 static int producer_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
205 {
206         int16_t *p;
207         int i, j;
208         int16_t *audio_channels[ 4 ];
209         
210         // Get the frames properties
211         mlt_properties properties = mlt_frame_properties( this );
212
213         // Get the dv decoder
214         dv_decoder_t *decoder = mlt_properties_get_data( properties, "dv_decoder", NULL );
215
216         // Get the dv data
217         uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );
218
219         // Obtain required values
220         *frequency = decoder->audio->frequency;
221         *samples = decoder->audio->samples_this_frame;
222         *channels = decoder->audio->num_channels;
223
224         // Create a temporary workspace
225         for ( i = 0; i < 4; i++ )
226                 audio_channels[ i ] = malloc( DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
227
228         // Create a workspace for the result
229         *buffer = malloc( *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
230
231         // Pass the allocated audio buffer as a property
232         mlt_properties_set_data( properties, "audio", *buffer, *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ), free, NULL );
233
234         // Decode the audio
235         dv_decode_full_audio( decoder, dv_data, audio_channels );
236         
237         // Interleave the audio
238         p = *buffer;
239         for ( i = 0; i < *samples; i++ )
240                 for ( j = 0; j < *channels; j++ )
241                         *p++ = audio_channels[ j ][ i ];
242
243         // Free the temporary work space
244         for ( i = 0; i < 4; i++ )
245                 free( audio_channels[ i ] );
246
247         return 0;
248 }
249
250 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
251 {
252         producer_libdv this = producer->child;
253         uint8_t *data = malloc( frame_size_625_50 );
254         
255         // Obtain the current frame number
256         uint64_t position = mlt_producer_frame( producer );
257         
258         // Convert timecode to a file position (ensuring that we're on a frame boundary)
259         uint64_t offset = position * this->frame_size;
260
261         // Create an empty frame
262         *frame = mlt_frame_init( );
263
264         // Seek and fetch
265         if ( this->fd != 0 && 
266                  lseek( this->fd, offset, SEEK_SET ) == offset &&
267                  read_frame( this->fd, data, &this->is_pal ) )
268         {
269                 // Get the frames properties
270                 mlt_properties properties = mlt_frame_properties( *frame );
271
272                 // Pass the dv decoder
273                 mlt_properties_set_data( properties, "dv_decoder", this->dv_decoder, 0, NULL, NULL );
274
275                 // Pass the dv data
276                 mlt_properties_set_data( properties, "dv_data", data, frame_size_625_50, free, NULL );
277
278                 // Update other info on the frame
279                 mlt_properties_set_int( properties, "width", 720 );
280                 mlt_properties_set_int( properties, "height", this->is_pal ? 576 : 480 );
281                 mlt_properties_set_int( properties, "top_field_first", 0 );
282                 
283                 // Parse the header for meta info
284                 dv_parse_header( this->dv_decoder, data );
285                 mlt_properties_set_int( properties, "progressive", dv_is_progressive( this->dv_decoder ) );
286                 mlt_properties_set_double( properties, "display_aspect", dv_format_wide( this->dv_decoder ) ? 16.0/9.0 : 4.0/3.0 );
287
288                 // Hmm - register audio callback
289                 ( *frame )->get_audio = producer_get_audio;
290                 
291                 // Push the get_image method on to the stack
292                 mlt_frame_push_get_image( *frame, producer_get_image );
293         }
294         else
295         {
296                 free( data );
297         }
298
299         // Update timecode on the frame we're creating
300         mlt_frame_set_timecode( *frame, mlt_producer_position( producer ) );
301
302         // Calculate the next timecode
303         mlt_producer_prepare_next( producer );
304
305         return 0;
306 }
307
308 static void producer_close( mlt_producer parent )
309 {
310         // Obtain this
311         producer_libdv this = parent->child;
312
313         // Free the dv deconder
314         dv_decoder_free( this->dv_decoder );
315
316         // Close the file
317         if ( this->fd != 0 )
318                 close( this->fd );
319
320         // Close the parent
321         parent->close = NULL;
322         mlt_producer_close( parent );
323
324         // Free the memory
325         free( this );
326 }
327