git.sesse.net Git - mlt/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         float display_aspect;
  52         int width;
  53         int height;
  54         int playing;
  55         int sdl_flags;
  56         SDL_Surface *sdl_screen;
  57         SDL_Overlay *sdl_overlay;
  58         uint8_t *buffer;
  59 };
  60
  61 /** Forward references to static functions.
  62 */
  63
  64 static int consumer_start( mlt_consumer parent );
  65 static int consumer_stop( mlt_consumer parent );
  66 static int consumer_is_stopped( mlt_consumer parent );
  67 static void consumer_close( mlt_consumer parent );
  68 static void *consumer_thread( void * );
  69 static int consumer_get_dimensions( int *width, int *height );
  70
  71 /** This is what will be called by the factory - anything can be passed in
  72         via the argument, but keep it simple.
  73 */
  74
  75 mlt_consumer consumer_sdl_init( char *arg )
  76 {
  77         // Create the consumer object
  78         consumer_sdl this = calloc( sizeof( struct consumer_sdl_s ), 1 );
  79
  80         // If no malloc'd and consumer init ok
  81         if ( this != NULL && mlt_consumer_init( &this->parent, this ) == 0 )
  82         {
  83                 // Create the queue
  84                 this->queue = mlt_deque_init( );
  85
  86                 // Get the parent consumer object
  87                 mlt_consumer parent = &this->parent;
  88
  89                 // We have stuff to clean up, so override the close method
  90                 parent->close = consumer_close;
  91
  92                 // get a handle on properties
  93                 mlt_service service = mlt_consumer_service( parent );
  94                 this->properties = mlt_service_properties( service );
  95
  96                 // Set the default volume
  97                 mlt_properties_set_double( this->properties, "volume", 1.0 );
  98
  99                 // This is the initialisation of the consumer
 100                 pthread_mutex_init( &this->audio_mutex, NULL );
 101                 pthread_cond_init( &this->audio_cond, NULL);
 102
 103                 // Default scaler (for now we'll use nearest)
 104                 mlt_properties_set( this->properties, "rescale", "nearest" );
 105
 106                 // Default buffer for low latency
 107                 mlt_properties_set_int( this->properties, "buffer", 1 );
 108
 109                 // Default progressive true
 110                 mlt_properties_set_int( this->properties, "progressive", 0 );
 111
 112                 // Get sample aspect ratio
 113                 this->aspect_ratio = mlt_properties_get_double( this->properties, "aspect_ratio" );
 114
 115                 // Default display aspect ratio
 116                 this->display_aspect = 4.0 / 3.0;
 117
 118                 // process actual param
 119                 if ( arg == NULL || sscanf( arg, "%dx%d", &this->width, &this->height ) != 2 )
 120                 {
 121                         this->width = mlt_properties_get_int( this->properties, "width" );
 122                         this->height = mlt_properties_get_int( this->properties, "height" );
 123
 124                         // Default window size
 125                         this->window_width = ( float )this->height * this->display_aspect + 0.5;
 126                         this->window_height = this->height;
 127                 }
 128                 else
 129                 {
 130                         if ( (int)( ( float )this->width / this->height * 1000 ) !=
 131                                  (int)( this->display_aspect * 1000 ) )
 132                         {
 133                                 // Override these
 134                                 this->display_aspect = ( float )this->width / this->height;
 135                                 this->aspect_ratio = 1.0;
 136                                 mlt_properties_set_double( this->properties, "aspect_ratio", this->aspect_ratio );
 137                         }
 138
 139                         // Set window size
 140                         this->window_width = this->width;
 141                         this->window_height = this->height;
 142                 }
 143
 144                 // Set the sdl flags
 145                 this->sdl_flags = SDL_HWSURFACE | SDL_ASYNCBLIT | SDL_HWACCEL | SDL_RESIZABLE;
 146
 147                 // Allow thread to be started/stopped
 148                 parent->start = consumer_start;
 149                 parent->stop = consumer_stop;
 150                 parent->is_stopped = consumer_is_stopped;
 151
 152                 // Return the consumer produced
 153                 return parent;
 154         }
 155
 156         // malloc or consumer init failed
 157         free( this );
 158
 159         // Indicate failure
 160         return NULL;
 161 }
 162
 163 int consumer_start( mlt_consumer parent )
 164 {
 165         consumer_sdl this = parent->child;
 166
 167         if ( !this->running )
 168         {
 169                 this->running = 1;
 170                 pthread_create( &this->thread, NULL, consumer_thread, this );
 171         }
 172
 173         return 0;
 174 }
 175
 176 int consumer_stop( mlt_consumer parent )
 177 {
 178         // Get the actual object
 179         consumer_sdl this = parent->child;
 180
 181         if ( this->running )
 182         {
 183                 // Kill the thread and clean up
 184                 this->running = 0;
 185
 186                 pthread_mutex_lock( &this->audio_mutex );
 187                 pthread_cond_broadcast( &this->audio_cond );
 188                 pthread_mutex_unlock( &this->audio_mutex );
 189
 190                 pthread_join( this->thread, NULL );
 191         }
 192
 193         return 0;
 194 }
 195
 196 int consumer_is_stopped( mlt_consumer parent )
 197 {
 198         consumer_sdl this = parent->child;
 199         return !this->running;
 200 }
 201
 202 static int sdl_lock_display( )
 203 {
 204         SDL_Surface *screen = SDL_GetVideoSurface( );
 205         return screen != NULL && ( !SDL_MUSTLOCK( screen ) || SDL_LockSurface( screen ) >= 0 );
 206 }
 207
 208 static void sdl_unlock_display( )
 209 {
 210         SDL_Surface *screen = SDL_GetVideoSurface( );
 211         if ( screen != NULL && SDL_MUSTLOCK( screen ) )
 212                 SDL_UnlockSurface( screen );
 213 }
 214
 215 static void sdl_fill_audio( void *udata, uint8_t *stream, int len )
 216 {
 217         consumer_sdl this = udata;
 218
 219         // Get the volume
 220         float volume = mlt_properties_get_double( this->properties, "volume" );
 221
 222         pthread_mutex_lock( &this->audio_mutex );
 223
 224         // Block until audio received
 225         while ( this->running && len > this->audio_avail )
 226                 pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 227
 228         if ( this->audio_avail >= len )
 229         {
 230                 // Place in the audio buffer
 231                 SDL_MixAudio( stream, this->audio_buffer, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 232
 233                 // Remove len from the audio available
 234                 this->audio_avail -= len;
 235
 236                 // Remove the samples
 237                 memmove( this->audio_buffer, this->audio_buffer + len, this->audio_avail );
 238         }
 239         else
 240         {
 241                 // Just to be safe, wipe the stream first
 242                 memset( stream, 0, len );
 243
 244                 // Copy what we have into the stream
 245                 memcpy( stream, this->audio_buffer, this->audio_avail );
 246
 247                 // Mix the audio
 248                 SDL_MixAudio( stream, stream, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 249
 250                 // No audio left
 251                 this->audio_avail = 0;
 252         }
 253
 254         // We're definitely playing now
 255         this->playing = 1;
 256
 257         pthread_cond_broadcast( &this->audio_cond );
 258         pthread_mutex_unlock( &this->audio_mutex );
 259 }
 260
 261 static int consumer_play_audio( consumer_sdl this, mlt_frame frame, int init_audio, int *duration )
 262 {
 263         // Get the properties of this consumer
 264         mlt_properties properties = this->properties;
 265         mlt_audio_format afmt = mlt_audio_pcm;
 266
 267         // Set the preferred params of the test card signal
 268         int channels = mlt_properties_get_int( properties, "channels" );
 269         int frequency = mlt_properties_get_int( properties, "frequency" );
 270         static int counter = 0;
 271
 272         int samples = mlt_sample_calculator( mlt_properties_get_double( this->properties, "fps" ), frequency, counter++ );
 273
 274         int16_t *pcm;
 275         int bytes;
 276
 277         mlt_frame_get_audio( frame, &pcm, &afmt, &frequency, &channels, &samples );
 278         *duration = ( ( samples * 1000 ) / frequency );
 279
 280         if ( mlt_properties_get_int( properties, "audio_off" ) )
 281         {
 282                 this->playing = 1;
 283                 init_audio = 1;
 284                 return init_audio;
 285         }
 286
 287         if ( init_audio == 1 )
 288         {
 289                 SDL_AudioSpec request;
 290                 SDL_AudioSpec got;
 291
 292                 // specify audio format
 293                 memset( &request, 0, sizeof( SDL_AudioSpec ) );
 294                 this->playing = 0;
 295                 request.freq = frequency;
 296                 request.format = AUDIO_S16;
 297                 request.channels = channels;
 298                 request.samples = 1024;
 299                 request.callback = sdl_fill_audio;
 300                 request.userdata = (void *)this;
 301                 if ( SDL_OpenAudio( &request, &got ) != 0 )
 302                 {
 303                         fprintf( stderr, "SDL failed to open audio: %s\n", SDL_GetError() );
 304                         init_audio = 2;
 305                 }
 306                 else if ( got.size != 0 )
 307                 {
 308                         SDL_PauseAudio( 0 );
 309                         init_audio = 0;
 310                 }
 311         }
 312
 313         if ( init_audio == 0 )
 314         {
 315                 mlt_properties properties = mlt_frame_properties( frame );
 316                 bytes = ( samples * channels * 2 );
 317                 pthread_mutex_lock( &this->audio_mutex );
 318                 while ( bytes > ( sizeof( this->audio_buffer) - this->audio_avail ) )
 319                         pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 320                 if ( mlt_properties_get_double( properties, "_speed" ) == 1 )
 321                         memcpy( &this->audio_buffer[ this->audio_avail ], pcm, bytes );
 322                 else
 323                         memset( &this->audio_buffer[ this->audio_avail ], 0, bytes );
 324                 this->audio_avail += bytes;
 325                 pthread_cond_broadcast( &this->audio_cond );
 326                 pthread_mutex_unlock( &this->audio_mutex );
 327         }
 328         else
 329         {
 330                 this->playing = 1;
 331         }
 332
 333         return init_audio;
 334 }
 335
 336 static int consumer_play_video( consumer_sdl this, mlt_frame frame )
 337 {
 338         // Get the properties of this consumer
 339         mlt_properties properties = this->properties;
 340
 341         mlt_image_format vfmt = mlt_image_yuv422;
 342         int width = this->width, height = this->height;
 343         uint8_t *image;
 344         int changed = 0;
 345
 346         if ( mlt_properties_get_int( properties, "video_off" ) == 0 )
 347         {
 348                 // Get the image, width and height
 349                 mlt_frame_get_image( frame, &image, &vfmt, &width, &height, 0 );
 350
 351                 // Handle events
 352                 if ( this->sdl_screen != NULL )
 353                 {
 354                         SDL_Event event;
 355
 356                         changed = consumer_get_dimensions( &this->window_width, &this->window_height );
 357
 358                         while ( SDL_PollEvent( &event ) )
 359                         {
 360                                 switch( event.type )
 361                                 {
 362                                         case SDL_VIDEORESIZE:
 363                                                 this->window_width = event.resize.w;
 364                                                 this->window_height = event.resize.h;
 365                                                 changed = 1;
 366                                                 break;
 367                                         case SDL_QUIT:
 368                                                 this->running = 0;
 369                                                 break;
 370                                         case SDL_KEYDOWN:
 371                                                 {
 372                                                         mlt_producer producer = mlt_properties_get_data( properties, "transport_producer", NULL );
 373                                                         char keyboard[ 2 ] = " ";
 374                                                         void (*callback)( mlt_producer, char * ) = mlt_properties_get_data( properties, "transport_callback", NULL );
 375                                                         if ( callback != NULL && producer != NULL && event.key.keysym.unicode < 0x80 && event.key.keysym.unicode > 0 )
 376                                                         {
 377                                                                 keyboard[ 0 ] = ( char )event.key.keysym.unicode;
 378                                                                 callback( producer, keyboard );
 379                                                         }
 380                                                 }
 381                                                 break;
 382                                 }
 383                         }
 384                 }
 385
 386                 if ( width != this->width || height != this->height )
 387                 {
 388                         this->width = width;
 389                         this->height = height;
 390                         changed = 1;
 391                 }
 392
 393                 if ( this->sdl_screen == NULL || changed )
 394                 {
 395                         SDL_Rect rect;
 396
 397                         // Determine frame's display aspect ratio
 398                         float frame_aspect = mlt_frame_get_aspect_ratio( frame ) * this->width / this->height;
 399
 400                         // Determine window's new display aspect ratio
 401                         float this_aspect = ( float )this->window_width / this->window_height;
 402
 403                         // If using hardware scaler
 404                         if ( mlt_properties_get( properties, "rescale" ) != NULL &&
 405                                 !strcmp( mlt_properties_get( properties, "rescale" ), "none" ) )
 406                         {
 407                                 // Special case optimisation to negate odd effect of sample aspect ratio
 408                                 // not corresponding exactly with image resolution.
 409                                 if ( ( (int)( this_aspect * 1000 ) == (int)( this->display_aspect * 1000 ) ) &&
 410                                          ( (int)( mlt_frame_get_aspect_ratio( frame ) * 1000 ) == (int)( this->aspect_ratio * 1000 ) ) )
 411                                 {
 412                                         rect.w = this->window_width;
 413                                         rect.h = this->window_height;
 414                                 }
 415                                 else
 416                                 {
 417                                         // Use hardware scaler to normalise display aspect ratio
 418                                         rect.w = frame_aspect / this_aspect * this->window_width + 0.5;
 419                                         rect.h = this->window_height;
 420                                         if ( rect.w > this->window_width )
 421                                         {
 422                                                 rect.w = this->window_width;
 423                                                 rect.h = this_aspect / frame_aspect * this->window_height + 0.5;
 424                                         }
 425                                 }
 426                         }
 427                         // Special case optimisation to negate odd effect of sample aspect ratio
 428                         // not corresponding exactly with image resolution.
 429                         else if ( (int)( this_aspect * 1000 ) == (int)( this->display_aspect * 1000 ) )
 430                         {
 431                                 rect.w = this->window_width;
 432                                 rect.h = this->window_height;
 433                         }
 434                         // Use hardware scaler to normalise sample aspect ratio
 435                         else if ( this->window_height * frame_aspect > this->window_width )
 436                         {
 437                                 rect.w = this->window_width;
 438                                 rect.h = this->window_width / frame_aspect + 0.5;
 439                         }
 440                         else
 441                         {
 442                                 rect.w = this->window_height * frame_aspect + 0.5;
 443                                 rect.h = this->window_height;
 444                         }
 445
 446                         rect.x = ( this->window_width - rect.w ) / 2;
 447                         rect.y = ( this->window_height - rect.h ) / 2;
 448
 449                         // Force an overlay recreation
 450                         if ( this->sdl_overlay != NULL )
 451                                 SDL_FreeYUVOverlay( this->sdl_overlay );
 452
 453                         // open SDL window with video overlay, if possible
 454                         this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 0, this->sdl_flags );
 455
 456                         if ( this->sdl_screen != NULL )
 457                         {
 458                                 SDL_SetClipRect( this->sdl_screen, &rect );
 459
 460                                 sdl_lock_display();
 461                                 this->sdl_overlay = SDL_CreateYUVOverlay( this->width - (this->width % 4), this->height - (this->height % 2 ), SDL_YUY2_OVERLAY, this->sdl_screen );
 462                                 sdl_unlock_display();
 463                         }
 464                 }
 465
 466                 if ( this->sdl_screen != NULL && this->sdl_overlay != NULL )
 467                 {
 468                         this->buffer = this->sdl_overlay->pixels[ 0 ];
 469                         if ( SDL_LockYUVOverlay( this->sdl_overlay ) >= 0 )
 470                         {
 471                                 memcpy( this->buffer, image, width * height * 2 );
 472                                 SDL_UnlockYUVOverlay( this->sdl_overlay );
 473                                 SDL_DisplayYUVOverlay( this->sdl_overlay, &this->sdl_screen->clip_rect );
 474                         }
 475                 }
 476         }
 477
 478         // Close the frame
 479         mlt_frame_close( frame );
 480
 481         return 0;
 482 }
 483
 484 /** Threaded wrapper for pipe.
 485 */
 486
 487 static void *consumer_thread( void *arg )
 488 {
 489         // Identify the arg
 490         consumer_sdl this = arg;
 491
 492         // Get the consumer
 493         mlt_consumer consumer = &this->parent;
 494
 495         // internal intialization
 496         int init_audio = 1;
 497
 498         // Obtain time of thread start
 499         struct timeval now;
 500         int64_t start = 0;
 501         int64_t elapsed = 0;
 502         int duration = 0;
 503         int64_t playtime = 0;
 504         struct timespec tm;
 505         mlt_frame next = NULL;
 506         mlt_frame frame = NULL;
 507
 508         if ( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_NOPARACHUTE ) < 0 )
 509         {
 510                 fprintf( stderr, "Failed to initialize SDL: %s\n", SDL_GetError() );
 511                 return NULL;
 512         }
 513
 514         SDL_EnableKeyRepeat( SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL );
 515         SDL_EnableUNICODE( 1 );
 516
 517         // Loop until told not to
 518         while( this->running )
 519         {
 520                 // Get a frame from the attached producer
 521                 frame = mlt_consumer_rt_frame( consumer );
 522
 523                 // Ensure that we have a frame
 524                 if ( frame != NULL )
 525                 {
 526                         // Play audio
 527                         init_audio = consumer_play_audio( this, frame, init_audio, &duration );
 528
 529                         if ( this->playing )
 530                         {
 531                                 // Get the current time
 532                                 gettimeofday( &now, NULL );
 533
 534                                 // Determine elapsed time
 535                                 if ( start == 0 )
 536                                         start = ( int64_t )now.tv_sec * 1000000 + now.tv_usec;
 537                                 else
 538                                         elapsed = ( ( int64_t )now.tv_sec * 1000000 + now.tv_usec) - start;
 539                         }
 540
 541                         // Set playtime for this frame
 542                         mlt_properties_set_position( mlt_frame_properties( frame ), "playtime", playtime );
 543
 544                         // Push this frame to the back of the queue
 545                         mlt_deque_push_back( this->queue, frame );
 546
 547                         // Calculate the next playtime
 548                         playtime += ( duration * 1000 );
 549                 }
 550
 551                 if ( this->playing )
 552                 {
 553                         // Pop the next frame
 554                         next = mlt_deque_pop_front( this->queue );
 555
 556                         // See if we have to delay the display of the current frame
 557                         if ( next != NULL && mlt_properties_get_int( mlt_frame_properties( next ), "rendered" ) == 1 )
 558                         {
 559                                 mlt_position scheduled = mlt_properties_get_position( mlt_frame_properties( next ), "playtime" ) + 5000;
 560                                 if ( scheduled > elapsed && mlt_deque_count( this->queue ) > 25 )
 561                                 {
 562                                         tm.tv_sec = ( scheduled - elapsed ) / 1000000;
 563                                         tm.tv_nsec = ( ( scheduled - elapsed ) % 1000000 ) * 1000;
 564                                         nanosleep( &tm, NULL );
 565
 566                                         // Show current frame
 567                                         consumer_play_video( this, next );
 568                                 }
 569                                 else if ( scheduled > elapsed )
 570                                 {
 571                                         // More time to kill
 572                                         mlt_deque_push_front( this->queue, next );
 573                                 }
 574                                 else
 575                                 {
 576                                         // Show current frame
 577                                         consumer_play_video( this, next );
 578                                 }
 579                         }
 580                         else
 581                         {
 582                                 // This is an unrendered frame - just close it
 583                                 mlt_frame_close( next );
 584                         }
 585                 }
 586         }
 587
 588         // internal cleanup
 589         if ( init_audio == 0 )
 590                 SDL_AudioQuit( );
 591         if ( this->sdl_overlay != NULL )
 592                 SDL_FreeYUVOverlay( this->sdl_overlay );
 593         SDL_Quit( );
 594
 595         while( mlt_deque_count( this->queue ) )
 596                 mlt_frame_close( mlt_deque_pop_back( this->queue ) );
 597
 598         this->sdl_screen = NULL;
 599         this->sdl_overlay = NULL;
 600         this->audio_avail = 0;
 601
 602         return NULL;
 603 }
 604
 605 static int consumer_get_dimensions( int *width, int *height )
 606 {
 607         int changed = 0;
 608
 609         // SDL windows manager structure
 610         SDL_SysWMinfo wm;
 611
 612         // Specify the SDL Version
 613         SDL_VERSION( &wm.version );
 614
 615         // Get the wm structure
 616         if ( SDL_GetWMInfo( &wm ) == 1 )
 617         {
 618                 // Check that we have the X11 wm
 619                 if ( wm.subsystem == SDL_SYSWM_X11 )
 620                 {
 621                         // Get the SDL window
 622                         Window window = wm.info.x11.window;
 623
 624                         // Get the display session
 625                         Display *display = wm.info.x11.display;
 626
 627                         // Get the window attributes
 628                         XWindowAttributes attr;
 629                         XGetWindowAttributes( display, window, &attr );
 630
 631                         // Determine whether window has changed
 632                         changed = *width != attr.width || *height != attr.height;
 633
 634                         // Return width and height
 635                         *width = attr.width;
 636                         *height = attr.height;
 637                 }
 638         }
 639
 640         return changed;
 641 }
 642
 643 /** Callback to allow override of the close method.
 644 */
 645
 646 static void consumer_close( mlt_consumer parent )
 647 {
 648         // Get the actual object
 649         consumer_sdl this = parent->child;
 650
 651         // Stop the consumer
 652         mlt_consumer_stop( parent );
 653
 654         // Destroy mutexes
 655         pthread_mutex_destroy( &this->audio_mutex );
 656         pthread_cond_destroy( &this->audio_cond );
 657
 658         // Now clean up the rest
 659         mlt_consumer_close( parent );
 660
 661         // Finally clean up this
 662         free( this );
 663 }