research.m1stereo.tv/gitweb/ - melted/blob - src/modules/sdl/consumer_sdl.c

   1 /*
   2  * consumer_sdl.c -- A Simple DirectMedia Layer consumer
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Dan Dennedy <dan@dennedy.org>
   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 "consumer_sdl.h"
  22 #include <framework/mlt_frame.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <pthread.h>
  27 #include <SDL/SDL.h>
  28 #include <SDL/SDL_syswm.h>
  29
  30 /** This classes definition.
  31 */
  32
  33 typedef struct consumer_sdl_s *consumer_sdl;
  34
  35 struct consumer_sdl_s
  36 {
  37         struct mlt_consumer_s parent;
  38         mlt_properties properties;
  39         int format;
  40         int video;
  41         pthread_t thread;
  42         int running;
  43         uint8_t audio_buffer[ 4096 * 6 ];
  44         int audio_avail;
  45         pthread_mutex_t audio_mutex;
  46         pthread_cond_t audio_cond;
  47         int window_width;
  48         int window_height;
  49         int width;
  50         int height;
  51         int playing;
  52         mlt_frame *queue;
  53         int size;
  54         int count;
  55 };
  56
  57 /** Forward references to static functions.
  58 */
  59
  60 static void consumer_close( mlt_consumer parent );
  61 static void *consumer_thread( void * );
  62 static int consumer_get_dimensions( int *width, int *height );
  63
  64 /** This is what will be called by the factory - anything can be passed in
  65         via the argument, but keep it simple.
  66 */
  67
  68 mlt_consumer consumer_sdl_init( char *arg )
  69 {
  70         // Create the consumer object
  71         consumer_sdl this = calloc( sizeof( struct consumer_sdl_s ), 1 );
  72
  73         // If no malloc'd and consumer init ok
  74         if ( this != NULL && mlt_consumer_init( &this->parent, this ) == 0 )
  75         {
  76                 // Get the parent consumer object
  77                 mlt_consumer parent = &this->parent;
  78
  79                 // We have stuff to clean up, so override the close method
  80                 parent->close = consumer_close;
  81
  82                 // get a handle on properties
  83                 mlt_service service = mlt_consumer_service( parent );
  84                 this->properties = mlt_service_properties( service );
  85
  86                 // Set the default volume
  87                 mlt_properties_set_double( this->properties, "volume", 1.0 );
  88
  89                 // This is the initialisation of the consumer
  90                 this->running = 1;
  91                 pthread_mutex_init( &this->audio_mutex, NULL );
  92                 pthread_cond_init( &this->audio_cond, NULL);
  93
  94                 // process actual param
  95                 if ( arg == NULL || !strcmp( arg, "PAL" ) )
  96                 {
  97                         this->width = 720;
  98                         this->height = 576;
  99                 }
 100                 else if ( !strcmp( arg, "NTSC" ) )
 101                 {
 102                         this->width = 720;
 103                         this->height = 480;
 104                 }
 105                 else if ( sscanf( arg, "%dx%d", &this->width, &this->height ) != 2 )
 106                 {
 107                         this->width = 720;
 108                         this->height = 576;
 109                 }
 110
 111                 // Create the the thread
 112                 pthread_create( &this->thread, NULL, consumer_thread, this );
 113
 114                 // Return the consumer produced
 115                 return parent;
 116         }
 117
 118         // malloc or consumer init failed
 119         free( this );
 120
 121         // Indicate failure
 122         return NULL;
 123 }
 124
 125 static int sdl_lock_display( )
 126 {
 127         SDL_Surface *screen = SDL_GetVideoSurface( );
 128         return screen != NULL && ( !SDL_MUSTLOCK( screen ) || SDL_LockSurface( screen ) >= 0 );
 129 }
 130
 131 static void sdl_unlock_display( )
 132 {
 133         SDL_Surface *screen = SDL_GetVideoSurface( );
 134         if ( screen != NULL && SDL_MUSTLOCK( screen ) )
 135                 SDL_UnlockSurface( screen );
 136 }
 137
 138 void sdl_fill_audio( void *udata, uint8_t *stream, int len )
 139 {
 140         consumer_sdl this = udata;
 141
 142         // Get the volume
 143         float volume = mlt_properties_get_double( this->properties, "volume" );
 144
 145         pthread_mutex_lock( &this->audio_mutex );
 146
 147         // Block until audio received
 148         while ( this->running && len > this->audio_avail )
 149                 pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 150
 151         if ( this->audio_avail >= len )
 152         {
 153                 // Place in the audio buffer
 154                 SDL_MixAudio( stream, this->audio_buffer, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 155
 156                 // Remove len from the audio available
 157                 this->audio_avail -= len;
 158
 159                 // Remove the samples
 160                 memmove( this->audio_buffer, this->audio_buffer + len, this->audio_avail );
 161         }
 162         else
 163         {
 164                 // Just to be safe, wipe the stream first
 165                 memset( stream, 0, len );
 166
 167                 // Copy what we have into the stream
 168                 memcpy( stream, this->audio_buffer, this->audio_avail );
 169
 170                 // Mix the audio
 171                 SDL_MixAudio( stream, stream, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 172
 173                 // No audio left
 174                 this->audio_avail = 0;
 175         }
 176
 177         // We're definitely playing now
 178         this->playing = 1;
 179
 180         pthread_cond_broadcast( &this->audio_cond );
 181         pthread_mutex_unlock( &this->audio_mutex );
 182 }
 183
 184 /** Threaded wrapper for pipe.
 185 */
 186
 187 static void *consumer_thread( void *arg )
 188 {
 189         // Identify the arg
 190         consumer_sdl this = arg;
 191
 192         // Get the consumer
 193         mlt_consumer consumer = &this->parent;
 194
 195         // Get the service assoicated to the consumer
 196         mlt_service service = mlt_consumer_service( consumer );
 197
 198         // Get the properties of this consumer
 199         mlt_properties properties = this->properties;
 200
 201         // Define a frame pointer
 202         mlt_frame frame;
 203
 204         // internal intialization
 205         int sdl_flags = SDL_HWSURFACE | SDL_DOUBLEBUF | SDL_HWACCEL | SDL_RESIZABLE;
 206         SDL_Surface *sdl_screen = NULL;
 207         SDL_Overlay *sdl_overlay = NULL;
 208         uint8_t *buffer = NULL;
 209         int init_audio = 1;
 210         int bytes;
 211
 212         if ( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_NOPARACHUTE ) < 0 )
 213         {
 214                 fprintf( stderr, "Failed to initialize SDL: %s\n", SDL_GetError() );
 215                 return NULL;
 216         }
 217
 218         // Loop until told not to
 219         while( this->running )
 220         {
 221                 // Get a frame from the service (should never return anything other than 0)
 222                 if ( mlt_service_get_frame( service, &frame, 0 ) == 0 )
 223                 {
 224                         mlt_image_format vfmt = mlt_image_yuv422;
 225                         int width = this->width, height = this->height;
 226                         uint8_t *image;
 227
 228                         mlt_audio_format afmt = mlt_audio_pcm;
 229                         int channels;
 230                         int samples;
 231                         int frequency;
 232                         int16_t *pcm;
 233                         int changed = 0;
 234
 235                         mlt_frame_get_audio( frame, &pcm, &afmt, &frequency, &channels, &samples );
 236                         if ( init_audio == 1 )
 237                         {
 238                                 SDL_AudioSpec request;
 239
 240                                 // specify audio format
 241                                 request.freq = frequency;
 242                                 request.format = AUDIO_S16;
 243                                 request.channels = channels;
 244                                 request.samples = 2048;
 245                                 request.callback = sdl_fill_audio;
 246                                 request.userdata = (void *)this;
 247                                 if ( SDL_OpenAudio( &request, NULL ) < 0 )
 248                                 {
 249                                         fprintf( stderr, "SDL failed to open audio: %s\n", SDL_GetError() );
 250                                         break;
 251                                 }
 252                                 SDL_PauseAudio( 0 );
 253                                 init_audio = 0;
 254                         }
 255                         bytes = ( samples * channels * 2 );
 256                         pthread_mutex_lock( &this->audio_mutex );
 257                         while ( bytes > ( sizeof( this->audio_buffer) - this->audio_avail ) )
 258                                 pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 259                         memcpy( &this->audio_buffer[ this->audio_avail ], pcm, bytes );
 260                         this->audio_avail += bytes;
 261                         pthread_cond_broadcast( &this->audio_cond );
 262                         pthread_mutex_unlock( &this->audio_mutex );
 263
 264                         if ( this->count == this->size )
 265                         {
 266                                 this->size += 25;
 267                                 this->queue = realloc( this->queue, sizeof( mlt_frame ) * this->size );
 268                         }
 269                         this->queue[ this->count ++ ] = frame;
 270
 271                         if ( this->playing )
 272                         {
 273                                 // We're working on the oldest frame now
 274                                 frame = this->queue[ 0 ];
 275
 276                                 // Shunt the frames in the queue down
 277                                 int i = 0;
 278                                 for ( i = 1; i < this->count; i ++ )
 279                                         this->queue[ i - 1 ] = this->queue[ i ];
 280                                 this->count --;
 281
 282                                 // Get the image, width and height
 283                                 mlt_frame_get_image( frame, &image, &vfmt, &width, &height, 0 );
 284
 285                                 if ( sdl_screen != NULL )
 286                                 {
 287                                         SDL_Event event;
 288
 289                                         changed = consumer_get_dimensions( &this->window_width, &this->window_height );
 290
 291                                         while ( SDL_PollEvent( &event ) )
 292                                         {
 293                                                 switch( event.type )
 294                                                 {
 295                                                         case SDL_VIDEORESIZE:
 296                                                                 this->window_width = event.resize.w;
 297                                                                 this->window_height = event.resize.h;
 298                                                                 changed = 1;
 299                                                                 break;
 300                                                         case SDL_KEYDOWN:
 301                                                                 {
 302                                                                         mlt_producer producer = mlt_properties_get_data( properties, "transport_producer", NULL );
 303                                                                         void (*callback)( mlt_producer, char * ) = mlt_properties_get_data( properties, "transport_callback", NULL );
 304                                                                         if ( callback != NULL && producer != NULL )
 305                                                                                 callback( producer, SDL_GetKeyName(event.key.keysym.sym) );
 306                                                                 }
 307                                                                 break;
 308                                                 }
 309                                         }
 310
 311                                         if ( width != this->width || height != this->height )
 312                                         {
 313                                                 this->width = width;
 314                                                 this->height = height;
 315                                                 changed = 1;
 316                                         }
 317                                 }
 318
 319                                 if ( sdl_screen == NULL || changed )
 320                                 {
 321                                         double aspect_ratio = mlt_frame_get_aspect_ratio( frame );
 322
 323                                         if ( mlt_properties_get_double( properties, "aspect_ratio" ) )
 324                                                 aspect_ratio = mlt_properties_get_double( properties, "aspect_ratio" );
 325
 326                                         if ( this->window_width == 0 || this->window_height == 0 )
 327                                         {
 328                                                 this->window_width = width;
 329                                                 this->window_height = height;
 330                                         }
 331
 332                                         // open SDL window with video overlay, if possible
 333                                         sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 0, sdl_flags );
 334
 335                                         if ( sdl_screen != NULL )
 336                                         {
 337                                                 SDL_Rect rect;
 338                                                 if ( this->window_width < this->window_height * aspect_ratio )
 339                                                 {
 340                                                         rect.w = this->window_width;
 341                                                         rect.h = this->window_width / aspect_ratio;
 342                                                 }
 343                                                 else
 344                                                 {
 345                                                         rect.w = this->window_height * aspect_ratio;
 346                                                         rect.h = this->window_height;
 347                                                 }
 348
 349                                                 rect.x = ( this->window_width - rect.w ) / 2;
 350                                                 rect.y = ( this->window_height - rect.h ) / 2;
 351
 352                                                 SDL_SetClipRect( sdl_screen, &rect );
 353
 354                                                 // Force an overlay recreation
 355                                                 if ( sdl_overlay != NULL )
 356                                                         SDL_FreeYUVOverlay( sdl_overlay );
 357                                                 sdl_lock_display();
 358                                                 sdl_overlay = SDL_CreateYUVOverlay( this->width, this->height, SDL_YUY2_OVERLAY, sdl_screen );
 359                                                 sdl_unlock_display();
 360                                         }
 361                                 }
 362
 363                                 if ( sdl_screen != NULL && sdl_overlay != NULL )
 364                                 {
 365                                         buffer = sdl_overlay->pixels[ 0 ];
 366                                         if ( sdl_lock_display() )
 367                                         {
 368                                                 if ( SDL_LockYUVOverlay( sdl_overlay ) >= 0 )
 369                                                 {
 370                                                         mlt_resize_yuv422( buffer, this->width, this->height, image, width, height );
 371                                                         SDL_UnlockYUVOverlay( sdl_overlay );
 372                                                         SDL_DisplayYUVOverlay( sdl_overlay, &sdl_screen->clip_rect );
 373                                                 }
 374                                                 sdl_unlock_display();
 375                                         }
 376                                 }
 377                         }
 378                         else
 379                         {
 380                                 frame = NULL;
 381                         }
 382
 383                         // Close the frame
 384                         if ( frame != NULL )
 385                                 mlt_frame_close( frame );
 386
 387                         if ( this->count )
 388                                 mlt_frame_get_image( this->queue[ this->count - 1 ], &image, &vfmt, &width, &height, 0 );
 389                 }
 390                 else
 391                 {
 392                         break;
 393                 }
 394         } // while
 395
 396         // internal cleanup
 397         if ( init_audio == 0 )
 398                 SDL_AudioQuit( );
 399         if ( sdl_overlay != NULL )
 400                 SDL_FreeYUVOverlay( sdl_overlay );
 401         SDL_Quit( );
 402
 403         return NULL;
 404 }
 405
 406 static int consumer_get_dimensions( int *width, int *height )
 407 {
 408         int changed = 0;
 409
 410         // SDL windows manager structure
 411         SDL_SysWMinfo wm;
 412
 413         // Specify the SDL Version
 414         SDL_VERSION( &wm.version );
 415
 416         // Get the wm structure
 417         if ( SDL_GetWMInfo( &wm ) == 1 )
 418         {
 419                 // Check that we have the X11 wm
 420                 if ( wm.subsystem == SDL_SYSWM_X11 )
 421                 {
 422                         // Get the SDL window
 423                         Window window = wm.info.x11.window;
 424
 425                         // Get the display session
 426                         Display *display = wm.info.x11.display;
 427
 428                         // Get the window attributes
 429                         XWindowAttributes attr;
 430                         XGetWindowAttributes( display, window, &attr );
 431
 432                         // Determine whether window has changed
 433                         changed = *width != attr.width || *height != attr.height;
 434
 435                         // Return width and height
 436                         *width = attr.width;
 437                         *height = attr.height;
 438                 }
 439         }
 440
 441         return changed;
 442 }
 443
 444 /** Callback to allow override of the close method.
 445 */
 446
 447 static void consumer_close( mlt_consumer parent )
 448 {
 449         // Get the actual object
 450         consumer_sdl this = parent->child;
 451
 452         // Kill the thread and clean up
 453         this->running = 0;
 454
 455         pthread_mutex_lock( &this->audio_mutex );
 456         pthread_cond_broadcast( &this->audio_cond );
 457         pthread_mutex_unlock( &this->audio_mutex );
 458
 459         pthread_join( this->thread, NULL );
 460         pthread_mutex_destroy( &this->audio_mutex );
 461         pthread_cond_destroy( &this->audio_cond );
 462
 463         // Now clean up the rest (the close = NULL is a bit nasty but needed for now)
 464         parent->close = NULL;
 465         mlt_consumer_close( parent );
 466
 467         // Finally clean up this
 468         free( this );
 469 }
 470