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 * 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         mlt_frame *queue;
  54         int size;
  55         int count;
  56         int sdl_flags;
  57         SDL_Surface *sdl_screen;
  58         SDL_Overlay *sdl_overlay;
  59         uint8_t *buffer;
  60 };
  61
  62 /** Forward references to static functions.
  63 */
  64
  65 static int consumer_start( mlt_consumer parent );
  66 static int consumer_stop( mlt_consumer parent );
  67 static int consumer_is_stopped( mlt_consumer parent );
  68 static void consumer_close( mlt_consumer parent );
  69 static void *consumer_thread( void * );
  70 static int consumer_get_dimensions( int *width, int *height );
  71
  72 /** This is what will be called by the factory - anything can be passed in
  73         via the argument, but keep it simple.
  74 */
  75
  76 mlt_consumer consumer_sdl_init( char *arg )
  77 {
  78         // Create the consumer object
  79         consumer_sdl this = calloc( sizeof( struct consumer_sdl_s ), 1 );
  80
  81         // If no malloc'd and consumer init ok
  82         if ( this != NULL && mlt_consumer_init( &this->parent, this ) == 0 )
  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                 // Get aspect ratio
 105                 this->aspect_ratio = mlt_properties_get_double( this->properties, "aspect_ratio" );
 106
 107                 // process actual param
 108                 if ( arg == NULL || sscanf( arg, "%dx%d", &this->width, &this->height ) != 2 )
 109                 {
 110                         this->width = mlt_properties_get_int( this->properties, "width" );
 111                         this->height = mlt_properties_get_int( this->properties, "height" );
 112                 }
 113
 114                 // Default window size
 115                 this->window_width = (int)( (float)this->height * this->aspect_ratio ) + 1;
 116                 this->window_height = this->height;
 117
 118                 // Set the sdl flags
 119                 this->sdl_flags = SDL_HWSURFACE | SDL_DOUBLEBUF | SDL_HWACCEL | SDL_RESIZABLE;
 120
 121                 // Allow thread to be started/stopped
 122                 parent->start = consumer_start;
 123                 parent->stop = consumer_stop;
 124                 parent->is_stopped = consumer_is_stopped;
 125
 126                 // Return the consumer produced
 127                 return parent;
 128         }
 129
 130         // malloc or consumer init failed
 131         free( this );
 132
 133         // Indicate failure
 134         return NULL;
 135 }
 136
 137 int consumer_start( mlt_consumer parent )
 138 {
 139         consumer_sdl this = parent->child;
 140
 141         if ( !this->running )
 142         {
 143                 this->running = 1;
 144                 pthread_create( &this->thread, NULL, consumer_thread, this );
 145         }
 146
 147         return 0;
 148 }
 149
 150 int consumer_stop( mlt_consumer parent )
 151 {
 152         // Get the actual object
 153         consumer_sdl this = parent->child;
 154
 155         if ( this->running )
 156         {
 157                 // Kill the thread and clean up
 158                 this->running = 0;
 159
 160                 pthread_mutex_lock( &this->audio_mutex );
 161                 pthread_cond_broadcast( &this->audio_cond );
 162                 pthread_mutex_unlock( &this->audio_mutex );
 163
 164                 pthread_join( this->thread, NULL );
 165         }
 166
 167         return 0;
 168 }
 169
 170 int consumer_is_stopped( mlt_consumer parent )
 171 {
 172         consumer_sdl this = parent->child;
 173         return !this->running;
 174 }
 175
 176 static int sdl_lock_display( )
 177 {
 178         SDL_Surface *screen = SDL_GetVideoSurface( );
 179         return screen != NULL && ( !SDL_MUSTLOCK( screen ) || SDL_LockSurface( screen ) >= 0 );
 180 }
 181
 182 static void sdl_unlock_display( )
 183 {
 184         SDL_Surface *screen = SDL_GetVideoSurface( );
 185         if ( screen != NULL && SDL_MUSTLOCK( screen ) )
 186                 SDL_UnlockSurface( screen );
 187 }
 188
 189 static void sdl_fill_audio( void *udata, uint8_t *stream, int len )
 190 {
 191         consumer_sdl this = udata;
 192
 193         // Get the volume
 194         float volume = mlt_properties_get_double( this->properties, "volume" );
 195
 196         pthread_mutex_lock( &this->audio_mutex );
 197
 198         // Block until audio received
 199         while ( this->running && len > this->audio_avail )
 200                 pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 201
 202         if ( this->audio_avail >= len )
 203         {
 204                 // Place in the audio buffer
 205                 SDL_MixAudio( stream, this->audio_buffer, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 206
 207                 // Remove len from the audio available
 208                 this->audio_avail -= len;
 209
 210                 // Remove the samples
 211                 memmove( this->audio_buffer, this->audio_buffer + len, this->audio_avail );
 212         }
 213         else
 214         {
 215                 // Just to be safe, wipe the stream first
 216                 memset( stream, 0, len );
 217
 218                 // Copy what we have into the stream
 219                 memcpy( stream, this->audio_buffer, this->audio_avail );
 220
 221                 // Mix the audio
 222                 SDL_MixAudio( stream, stream, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 223
 224                 // No audio left
 225                 this->audio_avail = 0;
 226         }
 227
 228         // We're definitely playing now
 229         this->playing = 1;
 230
 231         pthread_cond_broadcast( &this->audio_cond );
 232         pthread_mutex_unlock( &this->audio_mutex );
 233 }
 234
 235 static int consumer_play_audio( consumer_sdl this, mlt_frame frame, int init_audio )
 236 {
 237         // Get the properties of this consumer
 238         mlt_properties properties = this->properties;
 239         mlt_audio_format afmt = mlt_audio_pcm;
 240
 241         // Set the preferred params of the test card signal
 242         int channels = 2;
 243         int frequency = 48000;
 244         static int counter = 0;
 245         if ( mlt_properties_get_int( properties, "frequency" ) != 0 )
 246                 frequency =  mlt_properties_get_int( properties, "frequency" );
 247
 248         int samples = mlt_sample_calculator( mlt_properties_get_double( this->properties, "fps" ), frequency, counter++ );
 249
 250         int16_t *pcm;
 251         int bytes;
 252
 253         mlt_frame_get_audio( frame, &pcm, &afmt, &frequency, &channels, &samples );
 254
 255         if ( mlt_properties_get_int( properties, "audio_off" ) )
 256         {
 257                 this->playing = 1;
 258                 return init_audio;
 259         }
 260
 261         if ( init_audio == 1 )
 262         {
 263                 SDL_AudioSpec request;
 264                 SDL_AudioSpec got;
 265
 266                 SDL_EnableKeyRepeat( SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL );
 267                 SDL_EnableUNICODE( 1 );
 268
 269                 // specify audio format
 270                 memset( &request, 0, sizeof( SDL_AudioSpec ) );
 271                 this->playing = 0;
 272                 request.freq = frequency;
 273                 request.format = AUDIO_S16;
 274                 request.channels = channels;
 275                 request.samples = 1024;
 276                 request.callback = sdl_fill_audio;
 277                 request.userdata = (void *)this;
 278                 if ( SDL_OpenAudio( &request, &got ) != 0 )
 279                 {
 280                         fprintf( stderr, "SDL failed to open audio: %s\n", SDL_GetError() );
 281                         init_audio = 2;
 282                 }
 283                 else if ( got.size != 0 )
 284                 {
 285                         SDL_PauseAudio( 0 );
 286                         init_audio = 0;
 287                 }
 288         }
 289
 290         if ( init_audio == 0 )
 291         {
 292                 bytes = ( samples * channels * 2 );
 293                 pthread_mutex_lock( &this->audio_mutex );
 294                 while ( bytes > ( sizeof( this->audio_buffer) - this->audio_avail ) )
 295                         pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 296                 mlt_properties properties = mlt_frame_properties( frame );
 297                 if ( mlt_properties_get_double( properties, "_speed" ) == 1 )
 298                         memcpy( &this->audio_buffer[ this->audio_avail ], pcm, bytes );
 299                 else
 300                         memset( &this->audio_buffer[ this->audio_avail ], 0, bytes );
 301                 this->audio_avail += bytes;
 302                 pthread_cond_broadcast( &this->audio_cond );
 303                 pthread_mutex_unlock( &this->audio_mutex );
 304         }
 305         else
 306         {
 307                 this->playing = 1;
 308         }
 309
 310         return init_audio;
 311 }
 312
 313 static int consumer_play_video( consumer_sdl this, mlt_frame frame )
 314 {
 315         // Get the properties of this consumer
 316         mlt_properties properties = this->properties;
 317
 318         mlt_image_format vfmt = mlt_image_yuv422;
 319         int width = this->width, height = this->height;
 320         uint8_t *image;
 321         int changed = 0;
 322
 323         if ( mlt_properties_get_int( properties, "video_off" ) )
 324         {
 325                 mlt_frame_close( frame );
 326                 return 0;
 327         }
 328
 329         if ( this->count == this->size )
 330         {
 331                 this->size += 25;
 332                 this->queue = realloc( this->queue, sizeof( mlt_frame ) * this->size );
 333         }
 334         this->queue[ this->count ++ ] = frame;
 335
 336         if ( this->playing )
 337         {
 338                 // We're working on the oldest frame now
 339                 frame = this->queue[ 0 ];
 340
 341                 // Shunt the frames in the queue down
 342                 int i = 0;
 343                 for ( i = 1; i < this->count; i ++ )
 344                         this->queue[ i - 1 ] = this->queue[ i ];
 345                 this->count --;
 346
 347                 // Get the image, width and height
 348                 mlt_frame_get_image( frame, &image, &vfmt, &width, &height, 0 );
 349
 350                 if ( this->sdl_screen != NULL )
 351                 {
 352                         SDL_Event event;
 353
 354                         changed = consumer_get_dimensions( &this->window_width, &this->window_height );
 355
 356                         while ( SDL_PollEvent( &event ) )
 357                         {
 358                                 switch( event.type )
 359                                 {
 360                                         case SDL_VIDEORESIZE:
 361                                                 this->window_width = event.resize.w;
 362                                                 this->window_height = event.resize.h;
 363                                                 changed = 1;
 364                                                 break;
 365                                         case SDL_KEYDOWN:
 366                                                 {
 367                                                         mlt_producer producer = mlt_properties_get_data( properties, "transport_producer", NULL );
 368                                                         char keyboard[ 2 ] = " ";
 369                                                         void (*callback)( mlt_producer, char * ) = mlt_properties_get_data( properties, "transport_callback", NULL );
 370                                                         if ( callback != NULL && producer != NULL && event.key.keysym.unicode < 0x80 && event.key.keysym.unicode > 0 )
 371                                                         {
 372                                                                 keyboard[ 0 ] = ( char )event.key.keysym.unicode;
 373                                                                 callback( producer, keyboard );
 374                                                         }
 375                                                 }
 376                                                 break;
 377                                 }
 378                         }
 379
 380                 }
 381
 382                 if ( width != this->width || height != this->height )
 383                 {
 384                         this->width = width;
 385                         this->height = height;
 386                         changed = 1;
 387                 }
 388
 389                 if ( this->sdl_screen == NULL || changed )
 390                 {
 391                         double aspect_ratio = mlt_frame_get_aspect_ratio( frame );
 392                         float display_aspect_ratio = (float)width / (float)height;
 393                         SDL_Rect rect;
 394
 395                         if ( mlt_properties_get_double( properties, "aspect_ratio" ) )
 396                                 aspect_ratio = mlt_properties_get_double( properties, "aspect_ratio" );
 397
 398                         if ( aspect_ratio == 1 )
 399                         {
 400                                 rect.w = this->window_width;
 401                                 rect.h = this->window_height;
 402                         }
 403                         else if ( this->window_width < this->window_height * aspect_ratio )
 404                         {
 405                                 rect.w = this->window_width;
 406                                 rect.h = this->window_width / aspect_ratio;
 407                         }
 408                         else
 409                         {
 410                                 rect.w = this->window_height * aspect_ratio;
 411                                 rect.h = this->window_height;
 412                         }
 413
 414                         if ( mlt_properties_get_int( properties, "scale_overlay" ) )
 415                         {
 416                                 if ( ( float )rect.w * display_aspect_ratio < this->window_width )
 417                                         rect.w = ( int )( ( float )rect.w * display_aspect_ratio );
 418                                 else if ( ( float )rect.h * display_aspect_ratio < this->window_height )
 419                                         rect.h = ( int )( ( float )rect.h * display_aspect_ratio );
 420                         }
 421
 422                         rect.x = ( this->window_width - rect.w ) / 2;
 423                         rect.y = ( this->window_height - rect.h ) / 2;
 424
 425                         // Force an overlay recreation
 426                         if ( this->sdl_overlay != NULL )
 427                                 SDL_FreeYUVOverlay( this->sdl_overlay );
 428
 429                         // open SDL window with video overlay, if possible
 430                         this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 0, this->sdl_flags );
 431
 432                         if ( this->sdl_screen != NULL )
 433                         {
 434                                 SDL_SetClipRect( this->sdl_screen, &rect );
 435
 436                                 sdl_lock_display();
 437                                 this->sdl_overlay = SDL_CreateYUVOverlay( this->width - (this->width % 4), this->height- (this->height % 2 ), SDL_YUY2_OVERLAY, this->sdl_screen );
 438                                 sdl_unlock_display();
 439                         }
 440                 }
 441
 442                 if ( this->sdl_screen != NULL && this->sdl_overlay != NULL )
 443                 {
 444                         this->buffer = this->sdl_overlay->pixels[ 0 ];
 445                         if ( SDL_LockYUVOverlay( this->sdl_overlay ) >= 0 )
 446                         {
 447                                 mlt_resize_yuv422( this->buffer, this->width - (this->width % 4 ), this->height- (this->height % 2 ), image, width, height );
 448                                 SDL_UnlockYUVOverlay( this->sdl_overlay );
 449                                 SDL_DisplayYUVOverlay( this->sdl_overlay, &this->sdl_screen->clip_rect );
 450                         }
 451                 }
 452         }
 453         else
 454         {
 455                 frame = NULL;
 456         }
 457
 458         // Close the frame
 459         if ( frame != NULL )
 460                 mlt_frame_close( frame );
 461
 462         if ( this->count )
 463         {
 464                 // Tell the producers about our scale relative to the normalisation
 465                 mlt_properties_set_double( mlt_frame_properties( this->queue[ this->count - 1 ] ), "consumer_scale",
 466                         ( double )height / mlt_properties_get_double( properties, "height" ) );
 467                 mlt_frame_get_image( this->queue[ this->count - 1 ], &image, &vfmt, &width, &height, 0 );
 468         }
 469
 470         return 0;
 471 }
 472
 473 /** Threaded wrapper for pipe.
 474 */
 475
 476 static void *consumer_thread( void *arg )
 477 {
 478         // Identify the arg
 479         consumer_sdl this = arg;
 480
 481         // Get the consumer
 482         mlt_consumer consumer = &this->parent;
 483
 484         // internal intialization
 485         int init_audio = 1;
 486
 487         if ( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_NOPARACHUTE ) < 0 )
 488         {
 489                 fprintf( stderr, "Failed to initialize SDL: %s\n", SDL_GetError() );
 490                 return NULL;
 491         }
 492
 493         // Loop until told not to
 494         while( this->running )
 495         {
 496                 // Get a frame from the attached producer
 497                 mlt_frame frame = mlt_consumer_get_frame( consumer );
 498
 499                 // Ensure that we have a frame
 500                 if ( frame != NULL )
 501                 {
 502                         // SDL adapts display aspect, but set this so pixel aspect can be normalised
 503 //                      mlt_properties_set_double( mlt_frame_properties( frame ), "consumer_aspect_ratio",
 504 //                              mlt_frame_get_aspect_ratio( frame ) );
 505
 506                         init_audio = consumer_play_audio( this, frame, init_audio );
 507                         consumer_play_video( this, frame );
 508                 }
 509         }
 510
 511         // internal cleanup
 512         if ( init_audio == 0 )
 513                 SDL_AudioQuit( );
 514         if ( this->sdl_overlay != NULL )
 515                 SDL_FreeYUVOverlay( this->sdl_overlay );
 516         SDL_Quit( );
 517
 518         this->sdl_screen = NULL;
 519         this->sdl_overlay = NULL;
 520         this->audio_avail = 0;
 521
 522         return NULL;
 523 }
 524
 525 static int consumer_get_dimensions( int *width, int *height )
 526 {
 527         int changed = 0;
 528
 529         // SDL windows manager structure
 530         SDL_SysWMinfo wm;
 531
 532         // Specify the SDL Version
 533         SDL_VERSION( &wm.version );
 534
 535         // Get the wm structure
 536         if ( SDL_GetWMInfo( &wm ) == 1 )
 537         {
 538                 // Check that we have the X11 wm
 539                 if ( wm.subsystem == SDL_SYSWM_X11 )
 540                 {
 541                         // Get the SDL window
 542                         Window window = wm.info.x11.window;
 543
 544                         // Get the display session
 545                         Display *display = wm.info.x11.display;
 546
 547                         // Get the window attributes
 548                         XWindowAttributes attr;
 549                         XGetWindowAttributes( display, window, &attr );
 550
 551                         // Determine whether window has changed
 552                         changed = *width != attr.width || *height != attr.height;
 553
 554                         // Return width and height
 555                         *width = attr.width;
 556                         *height = attr.height;
 557                 }
 558         }
 559
 560         return changed;
 561 }
 562
 563 /** Callback to allow override of the close method.
 564 */
 565
 566 static void consumer_close( mlt_consumer parent )
 567 {
 568         // Get the actual object
 569         consumer_sdl this = parent->child;
 570
 571         // Stop the consumer
 572         mlt_consumer_stop( parent );
 573
 574         // Destroy mutexes
 575         pthread_mutex_destroy( &this->audio_mutex );
 576         pthread_cond_destroy( &this->audio_cond );
 577
 578         // Now clean up the rest
 579         mlt_consumer_close( parent );
 580
 581         // Finally clean up this
 582         free( this );
 583 }
 584