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 <framework/mlt_deque.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <pthread.h>
  28 #include <SDL/SDL.h>
  29 #include <SDL/SDL_syswm.h>
  30 #include <sys/time.h>
  31
  32 /** This classes definition.
  33 */
  34
  35 typedef struct consumer_sdl_s *consumer_sdl;
  36
  37 struct consumer_sdl_s
  38 {
  39         struct mlt_consumer_s parent;
  40         mlt_properties properties;
  41         mlt_deque queue;
  42         pthread_t thread;
  43         int running;
  44         uint8_t audio_buffer[ 4096 * 19 ];
  45         int audio_avail;
  46         pthread_mutex_t audio_mutex;
  47         pthread_cond_t audio_cond;
  48         int window_width;
  49         int window_height;
  50         float aspect_ratio;
  51         int width;
  52         int height;
  53         int playing;
  54         int sdl_flags;
  55         SDL_Surface *sdl_screen;
  56         SDL_Overlay *sdl_overlay;
  57         uint8_t *buffer;
  58 };
  59
  60 /** Forward references to static functions.
  61 */
  62
  63 static int consumer_start( mlt_consumer parent );
  64 static int consumer_stop( mlt_consumer parent );
  65 static int consumer_is_stopped( mlt_consumer parent );
  66 static void consumer_close( mlt_consumer parent );
  67 static void *consumer_thread( void * );
  68 static int consumer_get_dimensions( int *width, int *height );
  69
  70 /** This is what will be called by the factory - anything can be passed in
  71         via the argument, but keep it simple.
  72 */
  73
  74 mlt_consumer consumer_sdl_init( char *arg )
  75 {
  76         // Create the consumer object
  77         consumer_sdl this = calloc( sizeof( struct consumer_sdl_s ), 1 );
  78
  79         // If no malloc'd and consumer init ok
  80         if ( this != NULL && mlt_consumer_init( &this->parent, this ) == 0 )
  81         {
  82                 // Create the queue
  83                 this->queue = mlt_deque_init( );
  84
  85                 // Get the parent consumer object
  86                 mlt_consumer parent = &this->parent;
  87
  88                 // We have stuff to clean up, so override the close method
  89                 parent->close = consumer_close;
  90
  91                 // get a handle on properties
  92                 mlt_service service = mlt_consumer_service( parent );
  93                 this->properties = mlt_service_properties( service );
  94
  95                 // Set the default volume
  96                 mlt_properties_set_double( this->properties, "volume", 1.0 );
  97
  98                 // This is the initialisation of the consumer
  99                 pthread_mutex_init( &this->audio_mutex, NULL );
 100                 pthread_cond_init( &this->audio_cond, NULL);
 101
 102                 // Default scaler (for now we'll use nearest)
 103                 mlt_properties_set( this->properties, "rescale", "nearest" );
 104
 105                 // Default buffer for low latency
 106                 mlt_properties_set_int( this->properties, "buffer", 2 );
 107
 108                 // Default progressive true
 109                 mlt_properties_set_int( this->properties, "progressive", 0 );
 110
 111                 // Get aspect ratio
 112                 this->aspect_ratio = mlt_properties_get_double( this->properties, "aspect_ratio" );
 113
 114                 // process actual param
 115                 if ( arg == NULL || sscanf( arg, "%dx%d", &this->width, &this->height ) != 2 )
 116                 {
 117                         this->width = mlt_properties_get_int( this->properties, "width" );
 118                         this->height = mlt_properties_get_int( this->properties, "height" );
 119                 }
 120
 121                 // Default window size
 122                 this->window_width = (int)( (float)this->height * 4.0/3.0 + 0.5);
 123                 this->window_height = this->height;
 124
 125                 // Set the sdl flags
 126                 this->sdl_flags = SDL_HWSURFACE | SDL_ASYNCBLIT | SDL_HWACCEL | SDL_RESIZABLE;
 127
 128                 // Allow thread to be started/stopped
 129                 parent->start = consumer_start;
 130                 parent->stop = consumer_stop;
 131                 parent->is_stopped = consumer_is_stopped;
 132
 133                 // Return the consumer produced
 134                 return parent;
 135         }
 136
 137         // malloc or consumer init failed
 138         free( this );
 139
 140         // Indicate failure
 141         return NULL;
 142 }
 143
 144 int consumer_start( mlt_consumer parent )
 145 {
 146         consumer_sdl this = parent->child;
 147
 148         if ( !this->running )
 149         {
 150                 this->running = 1;
 151                 pthread_create( &this->thread, NULL, consumer_thread, this );
 152         }
 153
 154         return 0;
 155 }
 156
 157 int consumer_stop( mlt_consumer parent )
 158 {
 159         // Get the actual object
 160         consumer_sdl this = parent->child;
 161
 162         if ( this->running )
 163         {
 164                 // Kill the thread and clean up
 165                 this->running = 0;
 166
 167                 pthread_mutex_lock( &this->audio_mutex );
 168                 pthread_cond_broadcast( &this->audio_cond );
 169                 pthread_mutex_unlock( &this->audio_mutex );
 170
 171                 pthread_join( this->thread, NULL );
 172         }
 173
 174         return 0;
 175 }
 176
 177 int consumer_is_stopped( mlt_consumer parent )
 178 {
 179         consumer_sdl this = parent->child;
 180         return !this->running;
 181 }
 182
 183 static int sdl_lock_display( )
 184 {
 185         SDL_Surface *screen = SDL_GetVideoSurface( );
 186         return screen != NULL && ( !SDL_MUSTLOCK( screen ) || SDL_LockSurface( screen ) >= 0 );
 187 }
 188
 189 static void sdl_unlock_display( )
 190 {
 191         SDL_Surface *screen = SDL_GetVideoSurface( );
 192         if ( screen != NULL && SDL_MUSTLOCK( screen ) )
 193                 SDL_UnlockSurface( screen );
 194 }
 195
 196 static void sdl_fill_audio( void *udata, uint8_t *stream, int len )
 197 {
 198         consumer_sdl this = udata;
 199
 200         // Get the volume
 201         float volume = mlt_properties_get_double( this->properties, "volume" );
 202
 203         pthread_mutex_lock( &this->audio_mutex );
 204
 205         // Block until audio received
 206         while ( this->running && len > this->audio_avail )
 207                 pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 208
 209         if ( this->audio_avail >= len )
 210         {
 211                 // Place in the audio buffer
 212                 SDL_MixAudio( stream, this->audio_buffer, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 213
 214                 // Remove len from the audio available
 215                 this->audio_avail -= len;
 216
 217                 // Remove the samples
 218                 memmove( this->audio_buffer, this->audio_buffer + len, this->audio_avail );
 219         }
 220         else
 221         {
 222                 // Just to be safe, wipe the stream first
 223                 memset( stream, 0, len );
 224
 225                 // Copy what we have into the stream
 226                 memcpy( stream, this->audio_buffer, this->audio_avail );
 227
 228                 // Mix the audio
 229                 SDL_MixAudio( stream, stream, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 230
 231                 // No audio left
 232                 this->audio_avail = 0;
 233         }
 234
 235         // We're definitely playing now
 236         this->playing = 1;
 237
 238         pthread_cond_broadcast( &this->audio_cond );
 239         pthread_mutex_unlock( &this->audio_mutex );
 240 }
 241
 242 static int consumer_play_audio( consumer_sdl this, mlt_frame frame, int init_audio, int *duration )
 243 {
 244         // Get the properties of this consumer
 245         mlt_properties properties = this->properties;
 246         mlt_audio_format afmt = mlt_audio_pcm;
 247
 248         // Set the preferred params of the test card signal
 249         int channels = 2;
 250         int frequency = 48000;
 251         static int counter = 0;
 252         if ( mlt_properties_get_int( properties, "frequency" ) != 0 )
 253                 frequency =  mlt_properties_get_int( properties, "frequency" );
 254
 255         int samples = mlt_sample_calculator( mlt_properties_get_double( this->properties, "fps" ), frequency, counter++ );
 256
 257         int16_t *pcm;
 258         int bytes;
 259
 260         mlt_frame_get_audio( frame, &pcm, &afmt, &frequency, &channels, &samples );
 261         *duration = ( ( samples * 1000 ) / frequency );
 262
 263         if ( mlt_properties_get_int( properties, "audio_off" ) )
 264         {
 265                 this->playing = 1;
 266                 init_audio = 1;
 267                 return init_audio;
 268         }
 269
 270         if ( init_audio == 1 )
 271         {
 272                 SDL_AudioSpec request;
 273                 SDL_AudioSpec got;
 274
 275                 // specify audio format
 276                 memset( &request, 0, sizeof( SDL_AudioSpec ) );
 277                 this->playing = 0;
 278                 request.freq = frequency;
 279                 request.format = AUDIO_S16;
 280                 request.channels = channels;
 281                 request.samples = 1024;
 282                 request.callback = sdl_fill_audio;
 283                 request.userdata = (void *)this;
 284                 if ( SDL_OpenAudio( &request, &got ) != 0 )
 285                 {
 286                         fprintf( stderr, "SDL failed to open audio: %s\n", SDL_GetError() );
 287                         init_audio = 2;
 288                 }
 289                 else if ( got.size != 0 )
 290                 {
 291                         SDL_PauseAudio( 0 );
 292                         init_audio = 0;
 293                 }
 294         }
 295
 296         if ( init_audio == 0 )
 297         {
 298                 mlt_properties properties = mlt_frame_properties( frame );
 299                 bytes = ( samples * channels * 2 );
 300                 pthread_mutex_lock( &this->audio_mutex );
 301                 while ( bytes > ( sizeof( this->audio_buffer) - this->audio_avail ) )
 302                         pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 303                 if ( mlt_properties_get_double( properties, "_speed" ) == 1 )
 304                         memcpy( &this->audio_buffer[ this->audio_avail ], pcm, bytes );
 305                 else
 306                         memset( &this->audio_buffer[ this->audio_avail ], 0, bytes );
 307                 this->audio_avail += bytes;
 308                 pthread_cond_broadcast( &this->audio_cond );
 309                 pthread_mutex_unlock( &this->audio_mutex );
 310         }
 311         else
 312         {
 313                 this->playing = 1;
 314         }
 315
 316         return init_audio;
 317 }
 318
 319 static int consumer_play_video( consumer_sdl this, mlt_frame frame )
 320 {
 321         // Get the properties of this consumer
 322         mlt_properties properties = this->properties;
 323
 324         mlt_image_format vfmt = mlt_image_yuv422;
 325         int width = this->width, height = this->height;
 326         uint8_t *image;
 327         int changed = 0;
 328
 329         if ( mlt_properties_get_int( properties, "video_off" ) == 0 )
 330         {
 331                 // Get the image, width and height
 332                 mlt_frame_get_image( frame, &image, &vfmt, &width, &height, 0 );
 333
 334                 // Handle events
 335                 if ( this->sdl_screen != NULL )
 336                 {
 337                         SDL_Event event;
 338
 339                         changed = consumer_get_dimensions( &this->window_width, &this->window_height );
 340
 341                         while ( SDL_PollEvent( &event ) )
 342                         {
 343                                 switch( event.type )
 344                                 {
 345                                         case SDL_VIDEORESIZE:
 346                                                 this->window_width = event.resize.w;
 347                                                 this->window_height = event.resize.h;
 348                                                 changed = 1;
 349                                                 break;
 350                                         case SDL_QUIT:
 351                                                 this->running = 0;
 352                                                 break;
 353                                         case SDL_KEYDOWN:
 354                                                 {
 355                                                         mlt_producer producer = mlt_properties_get_data( properties, "transport_producer", NULL );
 356                                                         char keyboard[ 2 ] = " ";
 357                                                         void (*callback)( mlt_producer, char * ) = mlt_properties_get_data( properties, "transport_callback", NULL );
 358                                                         if ( callback != NULL && producer != NULL && event.key.keysym.unicode < 0x80 && event.key.keysym.unicode > 0 )
 359                                                         {
 360                                                                 keyboard[ 0 ] = ( char )event.key.keysym.unicode;
 361                                                                 callback( producer, keyboard );
 362                                                         }
 363                                                 }
 364                                                 break;
 365                                 }
 366                         }
 367                 }
 368
 369                 if ( width != this->width || height != this->height )
 370                 {
 371                         this->width = width;
 372                         this->height = height;
 373                         changed = 1;
 374                 }
 375
 376                 if ( this->sdl_screen == NULL || changed )
 377                 {
 378                         double aspect_ratio = ( float )this->aspect_ratio * this->width / this->height;
 379                         float display_aspect_ratio = ( float )width / height;
 380                         SDL_Rect rect;
 381                         if ( mlt_properties_get( properties, "rescale" ) != NULL &&
 382                                         !strcmp( mlt_properties_get( properties, "rescale" ), "none" ) )
 383                                 aspect_ratio = mlt_frame_get_aspect_ratio( frame ) * mlt_properties_get_int(mlt_frame_properties(frame),"width") / mlt_properties_get_int(mlt_frame_properties(frame),"height");
 384
 385                         if ( aspect_ratio == 1 )
 386                         {
 387                                 rect.w = this->window_width;
 388                                 rect.h = this->window_height;
 389                         }
 390                         else if ( this->window_width < this->window_height * aspect_ratio )
 391                         {
 392                                 rect.w = this->window_width;
 393                                 rect.h = this->window_width / aspect_ratio + 1;
 394                         }
 395                         else
 396                         {
 397                                 rect.w = this->window_height * aspect_ratio + 1;
 398                                 rect.h = this->window_height;
 399                         }
 400
 401                         if ( mlt_properties_get_int( properties, "scale_overlay" ) )
 402                         {
 403                                 if ( ( float )rect.w * display_aspect_ratio < this->window_width )
 404                                         rect.w = ( int )( ( float )rect.w * display_aspect_ratio );
 405                                 else if ( ( float )rect.h * display_aspect_ratio < this->window_height )
 406                                         rect.h = ( int )( ( float )rect.h * display_aspect_ratio );
 407                         }
 408
 409                         rect.x = ( this->window_width - rect.w ) / 2;
 410                         rect.y = ( this->window_height - rect.h ) / 2;
 411
 412                         // Force an overlay recreation
 413                         if ( this->sdl_overlay != NULL )
 414                                 SDL_FreeYUVOverlay( this->sdl_overlay );
 415
 416                         // open SDL window with video overlay, if possible
 417                         this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 0, this->sdl_flags );
 418
 419                         if ( this->sdl_screen != NULL )
 420                         {
 421                                 SDL_SetClipRect( this->sdl_screen, &rect );
 422
 423                                 sdl_lock_display();
 424                                 this->sdl_overlay = SDL_CreateYUVOverlay( this->width - (this->width % 4), this->height- (this->height % 2 ), SDL_YUY2_OVERLAY, this->sdl_screen );
 425                                 sdl_unlock_display();
 426                         }
 427                 }
 428
 429                 if ( this->sdl_screen != NULL && this->sdl_overlay != NULL )
 430                 {
 431                         this->buffer = this->sdl_overlay->pixels[ 0 ];
 432                         if ( SDL_LockYUVOverlay( this->sdl_overlay ) >= 0 )
 433                         {
 434                                 memcpy( this->buffer, image, width * height * 2 );
 435                                 SDL_UnlockYUVOverlay( this->sdl_overlay );
 436                                 SDL_DisplayYUVOverlay( this->sdl_overlay, &this->sdl_screen->clip_rect );
 437                         }
 438                 }
 439         }
 440
 441         // Close the frame
 442         mlt_frame_close( frame );
 443
 444         return 0;
 445 }
 446
 447 /** Threaded wrapper for pipe.
 448 */
 449
 450 static void *consumer_thread( void *arg )
 451 {
 452         // Identify the arg
 453         consumer_sdl this = arg;
 454
 455         // Get the consumer
 456         mlt_consumer consumer = &this->parent;
 457
 458         // internal intialization
 459         int init_audio = 1;
 460
 461         // Obtain time of thread start
 462         struct timeval now;
 463         int64_t start = 0;
 464         int64_t elapsed = 0;
 465         int duration = 0;
 466         int64_t playtime = 0;
 467         struct timespec tm;
 468         mlt_frame next = NULL;
 469         mlt_frame frame = NULL;
 470
 471         if ( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_NOPARACHUTE ) < 0 )
 472         {
 473                 fprintf( stderr, "Failed to initialize SDL: %s\n", SDL_GetError() );
 474                 return NULL;
 475         }
 476
 477         SDL_EnableKeyRepeat( SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL );
 478         SDL_EnableUNICODE( 1 );
 479
 480         // Loop until told not to
 481         while( this->running )
 482         {
 483                 // Get a frame from the attached producer
 484                 frame = mlt_consumer_rt_frame( consumer );
 485
 486                 // Ensure that we have a frame
 487                 if ( frame != NULL )
 488                 {
 489                         // Play audio
 490                         init_audio = consumer_play_audio( this, frame, init_audio, &duration );
 491
 492                         if ( this->playing )
 493                         {
 494                                 // Get the current time
 495                                 gettimeofday( &now, NULL );
 496
 497                                 // Determine elapsed time
 498                                 if ( start == 0 )
 499                                         start = ( int64_t )now.tv_sec * 1000000 + now.tv_usec;
 500                                 else
 501                                         elapsed = ( ( int64_t )now.tv_sec * 1000000 + now.tv_usec) - start;
 502                         }
 503
 504                         // Set playtime for this frame
 505                         mlt_properties_set_position( mlt_frame_properties( frame ), "playtime", playtime );
 506
 507                         // Push this frame to the back of the queue
 508                         mlt_deque_push_back( this->queue, frame );
 509
 510                         // Calculate the next playtime
 511                         playtime += ( duration * 1000 );
 512                 }
 513
 514                 if ( this->playing )
 515                 {
 516                         // Pop the next frame
 517                         next = mlt_deque_pop_front( this->queue );
 518
 519                         // See if we have to delay the display of the current frame
 520                         if ( next != NULL && mlt_properties_get_int( mlt_frame_properties( next ), "rendered" ) == 1 )
 521                         {
 522                                 mlt_position scheduled = mlt_properties_get_position( mlt_frame_properties( next ), "playtime" ) + 5000;
 523                                 if ( scheduled > elapsed && mlt_deque_count( this->queue ) > 25 )
 524                                 {
 525                                         tm.tv_sec = ( scheduled - elapsed ) / 1000000;
 526                                         tm.tv_nsec = ( ( scheduled - elapsed ) % 1000000 ) * 1000;
 527                                         nanosleep( &tm, NULL );
 528
 529                                         // Show current frame
 530                                         consumer_play_video( this, next );
 531                                 }
 532                                 else if ( scheduled > elapsed )
 533                                 {
 534                                         // More time to kill
 535                                         mlt_deque_push_front( this->queue, next );
 536                                 }
 537                                 else
 538                                 {
 539                                         // Show current frame
 540                                         consumer_play_video( this, next );
 541                                 }
 542                         }
 543                         else
 544                         {
 545                                 // This is an unrendered frame - just close it
 546                                 mlt_frame_close( next );
 547                         }
 548                 }
 549         }
 550
 551         // internal cleanup
 552         if ( init_audio == 0 )
 553                 SDL_AudioQuit( );
 554         if ( this->sdl_overlay != NULL )
 555                 SDL_FreeYUVOverlay( this->sdl_overlay );
 556         SDL_Quit( );
 557
 558         while( mlt_deque_count( this->queue ) )
 559                 mlt_frame_close( mlt_deque_pop_back( this->queue ) );
 560
 561         this->sdl_screen = NULL;
 562         this->sdl_overlay = NULL;
 563         this->audio_avail = 0;
 564
 565         return NULL;
 566 }
 567
 568 static int consumer_get_dimensions( int *width, int *height )
 569 {
 570         int changed = 0;
 571
 572         // SDL windows manager structure
 573         SDL_SysWMinfo wm;
 574
 575         // Specify the SDL Version
 576         SDL_VERSION( &wm.version );
 577
 578         // Get the wm structure
 579         if ( SDL_GetWMInfo( &wm ) == 1 )
 580         {
 581                 // Check that we have the X11 wm
 582                 if ( wm.subsystem == SDL_SYSWM_X11 )
 583                 {
 584                         // Get the SDL window
 585                         Window window = wm.info.x11.window;
 586
 587                         // Get the display session
 588                         Display *display = wm.info.x11.display;
 589
 590                         // Get the window attributes
 591                         XWindowAttributes attr;
 592                         XGetWindowAttributes( display, window, &attr );
 593
 594                         // Determine whether window has changed
 595                         changed = *width != attr.width || *height != attr.height;
 596
 597                         // Return width and height
 598                         *width = attr.width;
 599                         *height = attr.height;
 600                 }
 601         }
 602
 603         return changed;
 604 }
 605
 606 /** Callback to allow override of the close method.
 607 */
 608
 609 static void consumer_close( mlt_consumer parent )
 610 {
 611         // Get the actual object
 612         consumer_sdl this = parent->child;
 613
 614         // Stop the consumer
 615         mlt_consumer_stop( parent );
 616
 617         // Destroy mutexes
 618         pthread_mutex_destroy( &this->audio_mutex );
 619         pthread_cond_destroy( &this->audio_cond );
 620
 621         // Now clean up the rest
 622         mlt_consumer_close( parent );
 623
 624         // Finally clean up this
 625         free( this );
 626 }