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
  31 /** This classes definition.
  32 */
  33
  34 typedef struct consumer_sdl_s *consumer_sdl;
  35
  36 struct consumer_sdl_s
  37 {
  38         struct mlt_consumer_s parent;
  39         mlt_properties properties;
  40         mlt_deque queue;
  41         pthread_t thread;
  42         int running;
  43         uint8_t audio_buffer[ 4096 * 3 ];
  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         float aspect_ratio;
  50         int width;
  51         int height;
  52         int playing;
  53         int sdl_flags;
  54         SDL_Surface *sdl_screen;
  55         SDL_Overlay *sdl_overlay;
  56         uint8_t *buffer;
  57 };
  58
  59 /** Forward references to static functions.
  60 */
  61
  62 static int consumer_start( mlt_consumer parent );
  63 static int consumer_stop( mlt_consumer parent );
  64 static int consumer_is_stopped( mlt_consumer parent );
  65 static void consumer_close( mlt_consumer parent );
  66 static void *consumer_thread( void * );
  67 static int consumer_get_dimensions( int *width, int *height );
  68
  69 /** This is what will be called by the factory - anything can be passed in
  70         via the argument, but keep it simple.
  71 */
  72
  73 mlt_consumer consumer_sdl_init( char *arg )
  74 {
  75         // Create the consumer object
  76         consumer_sdl this = calloc( sizeof( struct consumer_sdl_s ), 1 );
  77
  78         // If no malloc'd and consumer init ok
  79         if ( this != NULL && mlt_consumer_init( &this->parent, this ) == 0 )
  80         {
  81                 // Create the queue
  82                 this->queue = mlt_deque_init( );
  83
  84                 // Get the parent consumer object
  85                 mlt_consumer parent = &this->parent;
  86
  87                 // We have stuff to clean up, so override the close method
  88                 parent->close = consumer_close;
  89
  90                 // get a handle on properties
  91                 mlt_service service = mlt_consumer_service( parent );
  92                 this->properties = mlt_service_properties( service );
  93
  94                 // Set the default volume
  95                 mlt_properties_set_double( this->properties, "volume", 1.0 );
  96
  97                 // This is the initialisation of the consumer
  98                 pthread_mutex_init( &this->audio_mutex, NULL );
  99                 pthread_cond_init( &this->audio_cond, NULL);
 100
 101                 // Default scaler (for now we'll use nearest)
 102                 mlt_properties_set( this->properties, "rescale", "nearest" );
 103
 104                 // Default progressive true
 105                 mlt_properties_set_int( this->properties, "progressive", 1 );
 106
 107                 // Get aspect ratio
 108                 this->aspect_ratio = mlt_properties_get_double( this->properties, "aspect_ratio" );
 109
 110                 // process actual param
 111                 if ( arg == NULL || sscanf( arg, "%dx%d", &this->width, &this->height ) != 2 )
 112                 {
 113                         this->width = mlt_properties_get_int( this->properties, "width" );
 114                         this->height = mlt_properties_get_int( this->properties, "height" );
 115                 }
 116
 117                 // Default window size
 118                 this->window_width = (int)( (float)this->height * this->aspect_ratio ) + 1;
 119                 this->window_height = this->height;
 120
 121                 // Set the sdl flags
 122                 this->sdl_flags = SDL_HWSURFACE | SDL_ASYNCBLIT | SDL_HWACCEL | SDL_RESIZABLE;
 123
 124                 // Allow thread to be started/stopped
 125                 parent->start = consumer_start;
 126                 parent->stop = consumer_stop;
 127                 parent->is_stopped = consumer_is_stopped;
 128
 129                 // Return the consumer produced
 130                 return parent;
 131         }
 132
 133         // malloc or consumer init failed
 134         free( this );
 135
 136         // Indicate failure
 137         return NULL;
 138 }
 139
 140 int consumer_start( mlt_consumer parent )
 141 {
 142         consumer_sdl this = parent->child;
 143
 144         if ( !this->running )
 145         {
 146                 this->running = 1;
 147                 pthread_create( &this->thread, NULL, consumer_thread, this );
 148         }
 149
 150         return 0;
 151 }
 152
 153 int consumer_stop( mlt_consumer parent )
 154 {
 155         // Get the actual object
 156         consumer_sdl this = parent->child;
 157
 158         if ( this->running )
 159         {
 160                 // Kill the thread and clean up
 161                 this->running = 0;
 162
 163                 pthread_mutex_lock( &this->audio_mutex );
 164                 pthread_cond_broadcast( &this->audio_cond );
 165                 pthread_mutex_unlock( &this->audio_mutex );
 166
 167                 pthread_join( this->thread, NULL );
 168         }
 169
 170         return 0;
 171 }
 172
 173 int consumer_is_stopped( mlt_consumer parent )
 174 {
 175         consumer_sdl this = parent->child;
 176         return !this->running;
 177 }
 178
 179 static int sdl_lock_display( )
 180 {
 181         SDL_Surface *screen = SDL_GetVideoSurface( );
 182         return screen != NULL && ( !SDL_MUSTLOCK( screen ) || SDL_LockSurface( screen ) >= 0 );
 183 }
 184
 185 static void sdl_unlock_display( )
 186 {
 187         SDL_Surface *screen = SDL_GetVideoSurface( );
 188         if ( screen != NULL && SDL_MUSTLOCK( screen ) )
 189                 SDL_UnlockSurface( screen );
 190 }
 191
 192 static void sdl_fill_audio( void *udata, uint8_t *stream, int len )
 193 {
 194         consumer_sdl this = udata;
 195
 196         // Get the volume
 197         float volume = mlt_properties_get_double( this->properties, "volume" );
 198
 199         pthread_mutex_lock( &this->audio_mutex );
 200
 201         // Block until audio received
 202         while ( this->running && len > this->audio_avail )
 203                 pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 204
 205         if ( this->audio_avail >= len )
 206         {
 207                 // Place in the audio buffer
 208                 SDL_MixAudio( stream, this->audio_buffer, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 209
 210                 // Remove len from the audio available
 211                 this->audio_avail -= len;
 212
 213                 // Remove the samples
 214                 memmove( this->audio_buffer, this->audio_buffer + len, this->audio_avail );
 215         }
 216         else
 217         {
 218                 // Just to be safe, wipe the stream first
 219                 memset( stream, 0, len );
 220
 221                 // Copy what we have into the stream
 222                 memcpy( stream, this->audio_buffer, this->audio_avail );
 223
 224                 // Mix the audio
 225                 SDL_MixAudio( stream, stream, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 226
 227                 // No audio left
 228                 this->audio_avail = 0;
 229         }
 230
 231         // We're definitely playing now
 232         this->playing = 1;
 233
 234         pthread_cond_broadcast( &this->audio_cond );
 235         pthread_mutex_unlock( &this->audio_mutex );
 236 }
 237
 238 static int consumer_play_audio( consumer_sdl this, mlt_frame frame, int init_audio )
 239 {
 240         // Get the properties of this consumer
 241         mlt_properties properties = this->properties;
 242         mlt_audio_format afmt = mlt_audio_pcm;
 243
 244         // Set the preferred params of the test card signal
 245         int channels = 2;
 246         int frequency = 48000;
 247         static int counter = 0;
 248         if ( mlt_properties_get_int( properties, "frequency" ) != 0 )
 249                 frequency =  mlt_properties_get_int( properties, "frequency" );
 250
 251         int samples = mlt_sample_calculator( mlt_properties_get_double( this->properties, "fps" ), frequency, counter++ );
 252
 253         int16_t *pcm;
 254         int bytes;
 255
 256         mlt_frame_get_audio( frame, &pcm, &afmt, &frequency, &channels, &samples );
 257
 258         if ( mlt_properties_get_int( properties, "audio_off" ) )
 259         {
 260                 this->playing = 1;
 261                 return init_audio;
 262         }
 263
 264         if ( init_audio == 1 )
 265         {
 266                 SDL_AudioSpec request;
 267                 SDL_AudioSpec got;
 268
 269                 SDL_EnableKeyRepeat( SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL );
 270                 SDL_EnableUNICODE( 1 );
 271
 272                 // specify audio format
 273                 memset( &request, 0, sizeof( SDL_AudioSpec ) );
 274                 this->playing = 0;
 275                 request.freq = frequency;
 276                 request.format = AUDIO_S16;
 277                 request.channels = channels;
 278                 request.samples = 1024;
 279                 request.callback = sdl_fill_audio;
 280                 request.userdata = (void *)this;
 281                 if ( SDL_OpenAudio( &request, &got ) != 0 )
 282                 {
 283                         fprintf( stderr, "SDL failed to open audio: %s\n", SDL_GetError() );
 284                         init_audio = 2;
 285                 }
 286                 else if ( got.size != 0 )
 287                 {
 288                         SDL_PauseAudio( 0 );
 289                         init_audio = 0;
 290                 }
 291         }
 292
 293         if ( init_audio == 0 )
 294         {
 295                 bytes = ( samples * channels * 2 );
 296                 pthread_mutex_lock( &this->audio_mutex );
 297                 while ( bytes > ( sizeof( this->audio_buffer) - this->audio_avail ) )
 298                         pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 299                 mlt_properties properties = mlt_frame_properties( frame );
 300                 if ( mlt_properties_get_double( properties, "_speed" ) == 1 )
 301                         memcpy( &this->audio_buffer[ this->audio_avail ], pcm, bytes );
 302                 else
 303                         memset( &this->audio_buffer[ this->audio_avail ], 0, bytes );
 304                 this->audio_avail += bytes;
 305                 pthread_cond_broadcast( &this->audio_cond );
 306                 pthread_mutex_unlock( &this->audio_mutex );
 307         }
 308         else
 309         {
 310                 this->playing = 1;
 311         }
 312
 313         return init_audio;
 314 }
 315
 316 static int consumer_play_video( consumer_sdl this, mlt_frame frame )
 317 {
 318         // Get the properties of this consumer
 319         mlt_properties properties = this->properties;
 320
 321         mlt_image_format vfmt = mlt_image_yuv422;
 322         int width = this->width, height = this->height;
 323         uint8_t *image;
 324         int changed = 0;
 325
 326         if ( mlt_properties_get_int( properties, "video_off" ) )
 327         {
 328                 mlt_frame_close( frame );
 329                 return 0;
 330         }
 331
 332         // Push this frame to the back of the queue
 333         mlt_deque_push_back( this->queue, frame );
 334
 335         if ( this->playing )
 336         {
 337                 // Get the frame at the front of the queue
 338                 frame = mlt_deque_pop_front( this->queue );
 339
 340                 // Get the image, width and height
 341                 mlt_frame_get_image( frame, &image, &vfmt, &width, &height, 0 );
 342
 343                 if ( this->sdl_screen != NULL )
 344                 {
 345                         SDL_Event event;
 346
 347                         changed = consumer_get_dimensions( &this->window_width, &this->window_height );
 348
 349                         while ( SDL_PollEvent( &event ) )
 350                         {
 351                                 switch( event.type )
 352                                 {
 353                                         case SDL_VIDEORESIZE:
 354                                                 this->window_width = event.resize.w;
 355                                                 this->window_height = event.resize.h;
 356                                                 changed = 1;
 357                                                 break;
 358                                         case SDL_KEYDOWN:
 359                                                 {
 360                                                         mlt_producer producer = mlt_properties_get_data( properties, "transport_producer", NULL );
 361                                                         char keyboard[ 2 ] = " ";
 362                                                         void (*callback)( mlt_producer, char * ) = mlt_properties_get_data( properties, "transport_callback", NULL );
 363                                                         if ( callback != NULL && producer != NULL && event.key.keysym.unicode < 0x80 && event.key.keysym.unicode > 0 )
 364                                                         {
 365                                                                 keyboard[ 0 ] = ( char )event.key.keysym.unicode;
 366                                                                 callback( producer, keyboard );
 367                                                         }
 368                                                 }
 369                                                 break;
 370                                 }
 371                         }
 372
 373                 }
 374
 375                 if ( width != this->width || height != this->height )
 376                 {
 377                         this->width = width;
 378                         this->height = height;
 379                         changed = 1;
 380                 }
 381
 382                 if ( this->sdl_screen == NULL || changed )
 383                 {
 384                         double aspect_ratio = mlt_frame_get_aspect_ratio( frame );
 385                         float display_aspect_ratio = (float)width / (float)height;
 386                         SDL_Rect rect;
 387
 388                         if ( mlt_properties_get_double( properties, "aspect_ratio" ) )
 389                                 aspect_ratio = mlt_properties_get_double( properties, "aspect_ratio" );
 390
 391                         if ( aspect_ratio == 1 )
 392                         {
 393                                 rect.w = this->window_width;
 394                                 rect.h = this->window_height;
 395                         }
 396                         else if ( this->window_width < this->window_height * aspect_ratio )
 397                         {
 398                                 rect.w = this->window_width;
 399                                 rect.h = this->window_width / aspect_ratio;
 400                         }
 401                         else
 402                         {
 403                                 rect.w = this->window_height * aspect_ratio;
 404                                 rect.h = this->window_height;
 405                         }
 406
 407                         if ( mlt_properties_get_int( properties, "scale_overlay" ) )
 408                         {
 409                                 if ( ( float )rect.w * display_aspect_ratio < this->window_width )
 410                                         rect.w = ( int )( ( float )rect.w * display_aspect_ratio );
 411                                 else if ( ( float )rect.h * display_aspect_ratio < this->window_height )
 412                                         rect.h = ( int )( ( float )rect.h * display_aspect_ratio );
 413                         }
 414
 415                         rect.x = ( this->window_width - rect.w ) / 2;
 416                         rect.y = ( this->window_height - rect.h ) / 2;
 417
 418                         // Force an overlay recreation
 419                         if ( this->sdl_overlay != NULL )
 420                                 SDL_FreeYUVOverlay( this->sdl_overlay );
 421
 422                         // open SDL window with video overlay, if possible
 423                         this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 0, this->sdl_flags );
 424
 425                         if ( this->sdl_screen != NULL )
 426                         {
 427                                 SDL_SetClipRect( this->sdl_screen, &rect );
 428
 429                                 sdl_lock_display();
 430                                 this->sdl_overlay = SDL_CreateYUVOverlay( this->width - (this->width % 4), this->height- (this->height % 2 ), SDL_YUY2_OVERLAY, this->sdl_screen );
 431                                 sdl_unlock_display();
 432                         }
 433                 }
 434
 435                 if ( this->sdl_screen != NULL && this->sdl_overlay != NULL )
 436                 {
 437                         this->buffer = this->sdl_overlay->pixels[ 0 ];
 438                         if ( SDL_LockYUVOverlay( this->sdl_overlay ) >= 0 )
 439                         {
 440                                 memcpy( this->buffer, image, width * height * 2 );
 441                                 SDL_UnlockYUVOverlay( this->sdl_overlay );
 442                                 SDL_DisplayYUVOverlay( this->sdl_overlay, &this->sdl_screen->clip_rect );
 443                         }
 444                 }
 445         }
 446         else
 447         {
 448                 frame = NULL;
 449         }
 450
 451         // Close the frame
 452         if ( frame != NULL )
 453                 mlt_frame_close( frame );
 454
 455         if ( mlt_deque_count( this->queue ) )
 456         {
 457                 // Tell the producers about our scale relative to the normalisation
 458                 frame = mlt_deque_peek_front( this->queue );
 459                 mlt_properties_set_double( mlt_frame_properties( frame ), "consumer_scale",
 460                         ( double )height / mlt_properties_get_double( properties, "height" ) );
 461                 mlt_frame_get_image( frame, &image, &vfmt, &width, &height, 0 );
 462         }
 463
 464         return 0;
 465 }
 466
 467 /** Threaded wrapper for pipe.
 468 */
 469
 470 static void *consumer_thread( void *arg )
 471 {
 472         // Identify the arg
 473         consumer_sdl this = arg;
 474
 475         // Get the consumer
 476         mlt_consumer consumer = &this->parent;
 477
 478         // internal intialization
 479         int init_audio = 1;
 480
 481         if ( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_NOPARACHUTE ) < 0 )
 482         {
 483                 fprintf( stderr, "Failed to initialize SDL: %s\n", SDL_GetError() );
 484                 return NULL;
 485         }
 486
 487         // Loop until told not to
 488         while( this->running )
 489         {
 490                 // Get a frame from the attached producer
 491                 mlt_frame frame = mlt_consumer_get_frame( consumer );
 492
 493                 // Ensure that we have a frame
 494                 if ( frame != NULL )
 495                 {
 496                         // SDL adapts display aspect, but set this so pixel aspect can be normalised
 497 //                      mlt_properties_set_double( mlt_frame_properties( frame ), "consumer_aspect_ratio",
 498 //                              mlt_frame_get_aspect_ratio( frame ) );
 499
 500                         init_audio = consumer_play_audio( this, frame, init_audio );
 501                         consumer_play_video( this, frame );
 502                 }
 503         }
 504
 505         // internal cleanup
 506         if ( init_audio == 0 )
 507                 SDL_AudioQuit( );
 508         if ( this->sdl_overlay != NULL )
 509                 SDL_FreeYUVOverlay( this->sdl_overlay );
 510         SDL_Quit( );
 511
 512         while( mlt_deque_count( this->queue ) )
 513                 mlt_frame_close( mlt_deque_pop_back( this->queue ) );
 514
 515         this->sdl_screen = NULL;
 516         this->sdl_overlay = NULL;
 517         this->audio_avail = 0;
 518
 519         return NULL;
 520 }
 521
 522 static int consumer_get_dimensions( int *width, int *height )
 523 {
 524         int changed = 0;
 525
 526         // SDL windows manager structure
 527         SDL_SysWMinfo wm;
 528
 529         // Specify the SDL Version
 530         SDL_VERSION( &wm.version );
 531
 532         // Get the wm structure
 533         if ( SDL_GetWMInfo( &wm ) == 1 )
 534         {
 535                 // Check that we have the X11 wm
 536                 if ( wm.subsystem == SDL_SYSWM_X11 )
 537                 {
 538                         // Get the SDL window
 539                         Window window = wm.info.x11.window;
 540
 541                         // Get the display session
 542                         Display *display = wm.info.x11.display;
 543
 544                         // Get the window attributes
 545                         XWindowAttributes attr;
 546                         XGetWindowAttributes( display, window, &attr );
 547
 548                         // Determine whether window has changed
 549                         changed = *width != attr.width || *height != attr.height;
 550
 551                         // Return width and height
 552                         *width = attr.width;
 553                         *height = attr.height;
 554                 }
 555         }
 556
 557         return changed;
 558 }
 559
 560 /** Callback to allow override of the close method.
 561 */
 562
 563 static void consumer_close( mlt_consumer parent )
 564 {
 565         // Get the actual object
 566         consumer_sdl this = parent->child;
 567
 568         // Stop the consumer
 569         mlt_consumer_stop( parent );
 570
 571         // Destroy mutexes
 572         pthread_mutex_destroy( &this->audio_mutex );
 573         pthread_cond_destroy( &this->audio_cond );
 574
 575         // Now clean up the rest
 576         mlt_consumer_close( parent );
 577
 578         // Finally clean up this
 579         free( this );
 580 }
 581