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 ( this != NULL && mlt_producer_init( &this->parent, this ) == 0 )
56 mlt_producer producer = &this->parent;
58 // Register transport implementation with the producer
59 producer->close = producer_close;
61 // Register our get_frame implementation with the producer
62 producer->get_frame = producer_get_frame;
64 // Create the dv_decoder
65 this->dv_decoder = dv_decoder_new( FALSE, FALSE, FALSE );
66 this->dv_decoder->quality = DV_QUALITY_BEST;
67 this->dv_decoder->audio->arg_audio_emphasis = 2;
68 dv_set_audio_correction( this->dv_decoder, DV_AUDIO_CORRECT_AVERAGE );
70 // Open the file if specified
71 if ( filename != NULL )
73 this->fd = open( filename, O_RDONLY );
74 producer_collect_info( this );
77 // Return the producer
84 static int read_frame( int fd, uint8_t* frame_buf, int *isPAL )
86 int result = read( fd, frame_buf, frame_size_525_60 ) == frame_size_525_60;
89 *isPAL = ( frame_buf[3] & 0x80 );
93 int diff = frame_size_625_50 - frame_size_525_60;
94 result = read( fd, frame_buf + frame_size_525_60, diff ) == diff;
101 static int producer_collect_info( producer_libdv this )
104 uint8_t *dv_data = malloc( frame_size_625_50 );
106 if ( dv_data != NULL )
108 // Read the first frame
109 valid = read_frame( this->fd, dv_data, &this->is_pal );
111 // If it looks like a valid frame, the get stats
114 // Get the properties
115 mlt_properties properties = mlt_producer_properties( &this->parent );
117 // Determine the file size
119 fstat( this->fd, &buf );
121 // Store the file size
122 this->file_size = buf.st_size;
124 // Determine the frame size
125 this->frame_size = this->is_pal ? frame_size_625_50 : frame_size_525_60;
127 // Determine the number of frames in the file
128 this->frames_in_file = this->file_size / this->frame_size;
130 // Calculate default in/out points
131 double fps = this->is_pal ? 25 : 30000 / 1001;
132 mlt_timecode length = ( mlt_timecode )( this->frames_in_file ) / fps;
133 mlt_properties_set_double( properties, "fps", fps );
134 mlt_properties_set_timecode( properties, "length", length );
135 mlt_properties_set_timecode( properties, "in", 0.0 );
136 mlt_properties_set_timecode( properties, "out", length );
138 // Set the speed to normal
139 mlt_properties_set_double( properties, "speed", 1 );
148 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
150 int pitches[3] = { 0, 0, 0 };
151 uint8_t *pixels[3] = { NULL, NULL, NULL };
153 // Get the frames properties
154 mlt_properties properties = mlt_frame_properties( this );
156 // Get the dv decoder
157 dv_decoder_t *decoder = mlt_properties_get_data( properties, "dv_decoder", NULL );
160 uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );
162 // Assign width and height from properties
163 *width = mlt_properties_get_int( properties, "width" );
164 *height = mlt_properties_get_int( properties, "height" );
166 // Extract an image of the format requested
167 if ( *format == mlt_image_yuv422 )
170 uint8_t *image = malloc( *width * *height * 2 );
172 // Pass to properties for clean up
173 mlt_properties_set_data( properties, "image", image, *width * *height * 2, free, NULL );
176 pitches[ 0 ] = *width * 2;
178 dv_decode_full_frame( decoder, dv_data, e_dv_color_yuv, pixels, pitches );
183 else if ( *format == mlt_image_rgb24 )
186 uint8_t *image = malloc( *width * *height * 3 );
188 // Pass to properties for clean up
189 mlt_properties_set_data( properties, "image", image, *width * *height * 3, free, NULL );
192 pitches[ 0 ] = 720 * 3;
194 dv_decode_full_frame( decoder, dv_data, e_dv_color_rgb, pixels, pitches );
203 static int producer_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
207 int16_t *audio_channels[ 4 ];
209 // Get the frames properties
210 mlt_properties properties = mlt_frame_properties( this );
212 // Get the dv decoder
213 dv_decoder_t *decoder = mlt_properties_get_data( properties, "dv_decoder", NULL );
216 uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );
218 // Obtain required values
219 *frequency = decoder->audio->frequency;
220 *samples = decoder->audio->samples_this_frame;
221 *channels = decoder->audio->num_channels;
223 // Create a temporary workspace
224 for ( i = 0; i < 4; i++ )
225 audio_channels[ i ] = malloc( DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
227 // Create a workspace for the result
228 *buffer = malloc( *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
230 // Pass the allocated audio buffer as a property
231 mlt_properties_set_data( properties, "audio", *buffer, *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ), free, NULL );
234 dv_decode_full_audio( decoder, dv_data, audio_channels );
236 // Interleave the audio
238 for ( i = 0; i < *samples; i++ )
239 for ( j = 0; j < *channels; j++ )
240 *p++ = audio_channels[ j ][ i ];
242 // Free the temporary work space
243 for ( i = 0; i < 4; i++ )
244 free( audio_channels[ i ] );
249 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
251 producer_libdv this = producer->child;
252 uint8_t *data = malloc( frame_size_625_50 );
254 // Obtain the current frame number
255 uint64_t position = mlt_producer_frame( producer );
257 // Convert timecode to a file position (ensuring that we're on a frame boundary)
258 uint64_t offset = position * this->frame_size;
260 // Create an empty frame
261 *frame = mlt_frame_init( );
264 if ( this->fd != 0 &&
265 lseek( this->fd, offset, SEEK_SET ) == offset &&
266 read_frame( this->fd, data, &this->is_pal ) )
268 // Get the frames properties
269 mlt_properties properties = mlt_frame_properties( *frame );
271 // Pass the dv decoder
272 mlt_properties_set_data( properties, "dv_decoder", this->dv_decoder, 0, NULL, NULL );
275 mlt_properties_set_data( properties, "dv_data", data, frame_size_625_50, free, NULL );
277 // Update other info on the frame
278 mlt_properties_set_int( properties, "width", 720 );
279 mlt_properties_set_int( properties, "height", this->is_pal ? 576 : 480 );
280 mlt_properties_set_int( properties, "top_field_first", 0 );
282 // Parse the header for meta info
283 dv_parse_header( this->dv_decoder, data );
284 mlt_properties_set_int( properties, "progressive", dv_is_progressive( this->dv_decoder ) );
285 mlt_properties_set_double( properties, "display_aspect", dv_format_wide( this->dv_decoder ) ? 16.0/9.0 : 4.0/3.0 );
287 // Hmm - register audio callback
288 ( *frame )->get_audio = producer_get_audio;
290 // Push the get_image method on to the stack
291 mlt_frame_push_get_image( *frame, producer_get_image );
298 // Update timecode on the frame we're creating
299 mlt_frame_set_timecode( *frame, mlt_producer_position( producer ) );
301 // Calculate the next timecode
302 mlt_producer_prepare_next( producer );
307 static void producer_close( mlt_producer parent )
310 producer_libdv this = parent->child;
312 // Free the dv deconder
313 dv_decoder_free( this->dv_decoder );
320 parent->close = NULL;
321 mlt_producer_close( parent );