2 * producer_libdv.c -- simple libdv test case
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Charles Yates <charles.yates@pandora.be>
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.
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.
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.
21 #include "producer_libdv.h"
22 #include <framework/mlt_frame.h>
28 #include <sys/types.h>
32 typedef struct producer_libdv_s *producer_libdv;
34 struct producer_libdv_s
36 struct mlt_producer_s parent;
38 dv_decoder_t *dv_decoder;
45 static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int index );
46 static void producer_close( mlt_producer parent );
48 static int producer_collect_info( producer_libdv this );
50 mlt_producer producer_libdv_init( char *filename )
52 producer_libdv this = calloc( sizeof( struct producer_libdv_s ), 1 );
54 if ( filename != NULL && this != NULL && mlt_producer_init( &this->parent, this ) == 0 )
56 mlt_producer producer = &this->parent;
57 mlt_properties properties = mlt_producer_properties( producer );
59 // Register transport implementation with the producer
60 producer->close = producer_close;
62 // Register our get_frame implementation with the producer
63 producer->get_frame = producer_get_frame;
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 );
71 // Open the file if specified
72 this->fd = open( filename, O_RDONLY );
75 if ( this->fd != -1 && producer_collect_info( this ) )
77 // Set the resource property (required for all producers)
78 mlt_properties_set( properties, "resource", filename );
83 mlt_producer_close( producer );
87 // Return the producer
94 static int read_frame( int fd, uint8_t* frame_buf, int *isPAL )
96 int result = read( fd, frame_buf, frame_size_525_60 ) == frame_size_525_60;
99 *isPAL = ( frame_buf[3] & 0x80 );
103 int diff = frame_size_625_50 - frame_size_525_60;
104 result = read( fd, frame_buf + frame_size_525_60, diff ) == diff;
111 static int producer_collect_info( producer_libdv this )
115 uint8_t *dv_data = malloc( frame_size_625_50 );
117 if ( dv_data != NULL )
119 // Read the first frame
120 valid = read_frame( this->fd, dv_data, &this->is_pal );
122 // If it looks like a valid frame, the get stats
125 // Get the properties
126 mlt_properties properties = mlt_producer_properties( &this->parent );
128 // Determine the file size
130 fstat( this->fd, &buf );
132 // Store the file size
133 this->file_size = buf.st_size;
135 // Determine the frame size
136 this->frame_size = this->is_pal ? frame_size_625_50 : frame_size_525_60;
138 // Determine the number of frames in the file
139 this->frames_in_file = this->file_size / this->frame_size;
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 )
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 );
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 );
165 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
167 int pitches[3] = { 0, 0, 0 };
168 uint8_t *pixels[3] = { NULL, NULL, NULL };
170 // Get the frames properties
171 mlt_properties properties = mlt_frame_properties( this );
173 // Get the dv decoder
174 dv_decoder_t *decoder = mlt_properties_get_data( properties, "dv_decoder", NULL );
177 uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );
179 // Parse the header for meta info
180 dv_parse_header( decoder, dv_data );
182 // Assign width and height from properties
183 *width = mlt_properties_get_int( properties, "width" );
184 *height = mlt_properties_get_int( properties, "height" );
186 // Extract an image of the format requested
187 if ( *format == mlt_image_yuv422 )
191 uint8_t *image = malloc( *width * ( *height + 1 ) * 2 );
193 // Pass to properties for clean up
194 mlt_properties_set_data( properties, "image", image, *width * ( *height + 1 ) * 2, free, NULL );
197 pitches[ 0 ] = *width * 2;
199 dv_decode_full_frame( decoder, dv_data, e_dv_color_yuv, pixels, pitches );
204 else if ( *format == mlt_image_rgb24 )
208 uint8_t *image = malloc( *width * ( *height + 1 ) * 3 );
210 // Pass to properties for clean up
211 mlt_properties_set_data( properties, "image", image, *width * ( *height + 1 ) * 3, free, NULL );
214 pitches[ 0 ] = 720 * 3;
216 dv_decode_full_frame( decoder, dv_data, e_dv_color_rgb, pixels, pitches );
225 static int producer_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
229 int16_t *audio_channels[ 4 ];
231 // Get the frames properties
232 mlt_properties properties = mlt_frame_properties( this );
234 // Get the dv decoder
235 dv_decoder_t *decoder = mlt_properties_get_data( properties, "dv_decoder", NULL );
238 uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );
240 // Parse the header for meta info
241 dv_parse_header( decoder, dv_data );
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;
249 // Create a temporary workspace
250 for ( i = 0; i < 4; i++ )
251 audio_channels[ i ] = malloc( DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
253 // Create a workspace for the result
254 *buffer = malloc( *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
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 );
260 dv_decode_full_audio( decoder, dv_data, audio_channels );
262 // Interleave the audio
264 for ( i = 0; i < *samples; i++ )
265 for ( j = 0; j < *channels; j++ )
266 *p++ = audio_channels[ j ][ i ];
268 // Free the temporary work space
269 for ( i = 0; i < 4; i++ )
270 free( audio_channels[ i ] );
275 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
277 producer_libdv this = producer->child;
278 uint8_t *data = malloc( frame_size_625_50 );
280 // Obtain the current frame number
281 uint64_t position = mlt_producer_frame( producer );
283 // Convert timecode to a file position (ensuring that we're on a frame boundary)
284 uint64_t offset = position * this->frame_size;
286 // Create an empty frame
287 *frame = mlt_frame_init( );
290 if ( this->fd != 0 &&
291 lseek( this->fd, offset, SEEK_SET ) == offset &&
292 read_frame( this->fd, data, &this->is_pal ) )
294 // Get the frames properties
295 mlt_properties properties = mlt_frame_properties( *frame );
297 // Pass the dv decoder
298 mlt_properties_set_data( properties, "dv_decoder", this->dv_decoder, 0, NULL, NULL );
301 mlt_properties_set_data( properties, "dv_data", data, frame_size_625_50, free, NULL );
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 );
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 );
313 // Hmm - register audio callback
314 ( *frame )->get_audio = producer_get_audio;
316 // Push the get_image method on to the stack
317 mlt_frame_push_get_image( *frame, producer_get_image );
324 // Update timecode on the frame we're creating
325 mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
327 // Calculate the next timecode
328 mlt_producer_prepare_next( producer );
333 static void producer_close( mlt_producer parent )
336 producer_libdv this = parent->child;
338 // Free the dv deconder
339 //dv_decoder_free( this->dv_decoder );
346 parent->close = NULL;
347 mlt_producer_close( parent );