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 );
73 producer_collect_info( this );
75 // Set the resource property (required for all producers)
76 mlt_properties_set( properties, "resource", filename );
78 // Return the producer
85 static int read_frame( int fd, uint8_t* frame_buf, int *isPAL )
87 int result = read( fd, frame_buf, frame_size_525_60 ) == frame_size_525_60;
90 *isPAL = ( frame_buf[3] & 0x80 );
94 int diff = frame_size_625_50 - frame_size_525_60;
95 result = read( fd, frame_buf + frame_size_525_60, diff ) == diff;
102 static int producer_collect_info( producer_libdv this )
105 uint8_t *dv_data = malloc( frame_size_625_50 );
107 if ( dv_data != NULL )
109 // Read the first frame
110 valid = read_frame( this->fd, dv_data, &this->is_pal );
112 // If it looks like a valid frame, the get stats
115 // Get the properties
116 mlt_properties properties = mlt_producer_properties( &this->parent );
118 // Determine the file size
120 fstat( this->fd, &buf );
122 // Store the file size
123 this->file_size = buf.st_size;
125 // Determine the frame size
126 this->frame_size = this->is_pal ? frame_size_625_50 : frame_size_525_60;
128 // Determine the number of frames in the file
129 this->frames_in_file = this->file_size / this->frame_size;
131 // Calculate default in/out points
132 double fps = this->is_pal ? 25 : 30000.0 / 1001.0;
133 mlt_properties_set_double( properties, "fps", fps );
134 mlt_properties_set_position( properties, "length", this->frames_in_file );
135 mlt_properties_set_position( properties, "in", 0 );
136 mlt_properties_set_position( properties, "out", this->frames_in_file - 1 );
138 // Parse the header for meta info
139 dv_parse_header( this->dv_decoder, dv_data );
140 mlt_properties_set_double( properties, "aspect_ratio", dv_format_wide( this->dv_decoder ) ? 16.0/9.0 : 4.0/3.0 );
149 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
151 int pitches[3] = { 0, 0, 0 };
152 uint8_t *pixels[3] = { NULL, NULL, NULL };
154 // Get the frames properties
155 mlt_properties properties = mlt_frame_properties( this );
157 // Get the dv decoder
158 dv_decoder_t *decoder = mlt_properties_get_data( properties, "dv_decoder", NULL );
161 uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );
163 // Parse the header for meta info
164 dv_parse_header( decoder, dv_data );
166 // Assign width and height from properties
167 *width = mlt_properties_get_int( properties, "width" );
168 *height = mlt_properties_get_int( properties, "height" );
170 // Extract an image of the format requested
171 if ( *format == mlt_image_yuv422 )
174 uint8_t *image = malloc( *width * *height * 2 );
176 // Pass to properties for clean up
177 mlt_properties_set_data( properties, "image", image, *width * *height * 2, free, NULL );
180 pitches[ 0 ] = *width * 2;
182 dv_decode_full_frame( decoder, dv_data, e_dv_color_yuv, pixels, pitches );
187 else if ( *format == mlt_image_rgb24 )
190 uint8_t *image = malloc( *width * *height * 3 );
192 // Pass to properties for clean up
193 mlt_properties_set_data( properties, "image", image, *width * *height * 3, free, NULL );
196 pitches[ 0 ] = 720 * 3;
198 dv_decode_full_frame( decoder, dv_data, e_dv_color_rgb, pixels, pitches );
207 static int producer_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
211 int16_t *audio_channels[ 4 ];
213 // Get the frames properties
214 mlt_properties properties = mlt_frame_properties( this );
216 // Get the dv decoder
217 dv_decoder_t *decoder = mlt_properties_get_data( properties, "dv_decoder", NULL );
220 uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );
222 // Parse the header for meta info
223 dv_parse_header( decoder, dv_data );
225 // Obtain required values
226 *frequency = decoder->audio->frequency;
227 *samples = decoder->audio->samples_this_frame;
228 *channels = decoder->audio->num_channels;
230 // Create a temporary workspace
231 for ( i = 0; i < 4; i++ )
232 audio_channels[ i ] = malloc( DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
234 // Create a workspace for the result
235 *buffer = malloc( *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
237 // Pass the allocated audio buffer as a property
238 mlt_properties_set_data( properties, "audio", *buffer, *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ), free, NULL );
241 dv_decode_full_audio( decoder, dv_data, audio_channels );
243 // Interleave the audio
245 for ( i = 0; i < *samples; i++ )
246 for ( j = 0; j < *channels; j++ )
247 *p++ = audio_channels[ j ][ i ];
249 // Free the temporary work space
250 for ( i = 0; i < 4; i++ )
251 free( audio_channels[ i ] );
256 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
258 producer_libdv this = producer->child;
259 uint8_t *data = malloc( frame_size_625_50 );
261 // Obtain the current frame number
262 uint64_t position = mlt_producer_frame( producer );
264 // Convert timecode to a file position (ensuring that we're on a frame boundary)
265 uint64_t offset = position * this->frame_size;
267 // Create an empty frame
268 *frame = mlt_frame_init( );
271 if ( this->fd != 0 &&
272 lseek( this->fd, offset, SEEK_SET ) == offset &&
273 read_frame( this->fd, data, &this->is_pal ) )
275 // Get the frames properties
276 mlt_properties properties = mlt_frame_properties( *frame );
278 // Pass the dv decoder
279 mlt_properties_set_data( properties, "dv_decoder", this->dv_decoder, 0, NULL, NULL );
282 mlt_properties_set_data( properties, "dv_data", data, frame_size_625_50, free, NULL );
284 // Update other info on the frame
285 mlt_properties_set_int( properties, "width", 720 );
286 mlt_properties_set_int( properties, "height", this->is_pal ? 576 : 480 );
287 mlt_properties_set_int( properties, "top_field_first", 0 );
289 // Parse the header for meta info
290 dv_parse_header( this->dv_decoder, data );
291 mlt_properties_set_int( properties, "progressive", dv_is_progressive( this->dv_decoder ) );
292 mlt_properties_set_double( properties, "aspect_ratio", dv_format_wide( this->dv_decoder ) ? 16.0/9.0 : 4.0/3.0 );
294 // Hmm - register audio callback
295 ( *frame )->get_audio = producer_get_audio;
297 // Push the get_image method on to the stack
298 mlt_frame_push_get_image( *frame, producer_get_image );
305 // Update timecode on the frame we're creating
306 mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
308 // Calculate the next timecode
309 mlt_producer_prepare_next( producer );
314 static void producer_close( mlt_producer parent )
317 producer_libdv this = parent->child;
319 // Free the dv deconder
320 //dv_decoder_free( this->dv_decoder );
327 parent->close = NULL;
328 mlt_producer_close( parent );