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                 // process actual param
 105                 if ( arg == NULL || sscanf( arg, "%dx%d", &this->width, &this->height ) != 2 )
 106                 {
 107                         this->width = mlt_properties_get_int( this->properties, "width" );
 108                         this->height = mlt_properties_get_int( this->properties, "height" );
 109                 }
 110
 111                 // Default window size and aspect ratio
 112                 this->aspect_ratio = 4.0 / 3.0;
 113                 this->window_width = (int)( (float)this->height * this->aspect_ratio ) + 1;
 114                 this->window_height = this->height;
 115
 116                 // Set the sdl flags
 117                 this->sdl_flags = SDL_HWSURFACE | SDL_DOUBLEBUF | SDL_HWACCEL | SDL_RESIZABLE;
 118
 119                 // Allow thread to be started/stopped
 120                 parent->start = consumer_start;
 121                 parent->stop = consumer_stop;
 122                 parent->is_stopped = consumer_is_stopped;
 123
 124                 // Return the consumer produced
 125                 return parent;
 126         }
 127
 128         // malloc or consumer init failed
 129         free( this );
 130
 131         // Indicate failure
 132         return NULL;
 133 }
 134
 135 int consumer_start( mlt_consumer parent )
 136 {
 137         consumer_sdl this = parent->child;
 138
 139         if ( !this->running )
 140         {
 141                 this->running = 1;
 142                 pthread_create( &this->thread, NULL, consumer_thread, this );
 143         }
 144
 145         return 0;
 146 }
 147
 148 int consumer_stop( mlt_consumer parent )
 149 {
 150         // Get the actual object
 151         consumer_sdl this = parent->child;
 152
 153         if ( this->running )
 154         {
 155                 // Kill the thread and clean up
 156                 this->running = 0;
 157
 158                 pthread_mutex_lock( &this->audio_mutex );
 159                 pthread_cond_broadcast( &this->audio_cond );
 160                 pthread_mutex_unlock( &this->audio_mutex );
 161
 162                 pthread_join( this->thread, NULL );
 163         }
 164
 165         return 0;
 166 }
 167
 168 int consumer_is_stopped( mlt_consumer parent )
 169 {
 170         consumer_sdl this = parent->child;
 171         return !this->running;
 172 }
 173
 174 static int sdl_lock_display( )
 175 {
 176         SDL_Surface *screen = SDL_GetVideoSurface( );
 177         return screen != NULL && ( !SDL_MUSTLOCK( screen ) || SDL_LockSurface( screen ) >= 0 );
 178 }
 179
 180 static void sdl_unlock_display( )
 181 {
 182         SDL_Surface *screen = SDL_GetVideoSurface( );
 183         if ( screen != NULL && SDL_MUSTLOCK( screen ) )
 184                 SDL_UnlockSurface( screen );
 185 }
 186
 187 static void sdl_fill_audio( void *udata, uint8_t *stream, int len )
 188 {
 189         consumer_sdl this = udata;
 190
 191         // Get the volume
 192         float volume = mlt_properties_get_double( this->properties, "volume" );
 193
 194         pthread_mutex_lock( &this->audio_mutex );
 195
 196         // Block until audio received
 197         while ( this->running && len > this->audio_avail )
 198                 pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 199
 200         if ( this->audio_avail >= len )
 201         {
 202                 // Place in the audio buffer
 203                 SDL_MixAudio( stream, this->audio_buffer, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 204
 205                 // Remove len from the audio available
 206                 this->audio_avail -= len;
 207
 208                 // Remove the samples
 209                 memmove( this->audio_buffer, this->audio_buffer + len, this->audio_avail );
 210         }
 211         else
 212         {
 213                 // Just to be safe, wipe the stream first
 214                 memset( stream, 0, len );
 215
 216                 // Copy what we have into the stream
 217                 memcpy( stream, this->audio_buffer, this->audio_avail );
 218
 219                 // Mix the audio
 220                 SDL_MixAudio( stream, stream, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 221
 222                 // No audio left
 223                 this->audio_avail = 0;
 224         }
 225
 226         // We're definitely playing now
 227         this->playing = 1;
 228
 229         pthread_cond_broadcast( &this->audio_cond );
 230         pthread_mutex_unlock( &this->audio_mutex );
 231 }
 232
 233 static int consumer_play_audio( consumer_sdl this, mlt_frame frame, int init_audio )
 234 {
 235         // Get the properties of this consumer
 236         mlt_properties properties = this->properties;
 237         mlt_audio_format afmt = mlt_audio_pcm;
 238
 239         // Set the preferred params of the test card signal
 240         int channels = 2;
 241         int frequency = 48000;
 242         static int counter = 0;
 243         if ( mlt_properties_get_int( properties, "frequency" ) != 0 )
 244                 frequency =  mlt_properties_get_int( properties, "frequency" );
 245
 246         int samples = mlt_sample_calculator( mlt_properties_get_double( this->properties, "fps" ), frequency, counter++ );
 247
 248         int16_t *pcm;
 249         int bytes;
 250
 251         mlt_frame_get_audio( frame, &pcm, &afmt, &frequency, &channels, &samples );
 252
 253         if ( mlt_properties_get_int( properties, "audio_off" ) )
 254         {
 255                 this->playing = 1;
 256                 return init_audio;
 257         }
 258
 259         if ( init_audio == 1 )
 260         {
 261                 SDL_AudioSpec request;
 262                 SDL_AudioSpec got;
 263
 264                 SDL_EnableKeyRepeat( SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL );
 265                 SDL_EnableUNICODE( 1 );
 266
 267                 // specify audio format
 268                 memset( &request, 0, sizeof( SDL_AudioSpec ) );
 269                 this->playing = 0;
 270                 request.freq = frequency;
 271                 request.format = AUDIO_S16;
 272                 request.channels = channels;
 273                 request.samples = 1024;
 274                 request.callback = sdl_fill_audio;
 275                 request.userdata = (void *)this;
 276                 if ( SDL_OpenAudio( &request, &got ) != 0 )
 277                 {
 278                         fprintf( stderr, "SDL failed to open audio: %s\n", SDL_GetError() );
 279                         init_audio = 2;
 280                 }
 281                 else if ( got.size != 0 )
 282                 {
 283                         SDL_PauseAudio( 0 );
 284                         init_audio = 0;
 285                 }
 286         }
 287
 288         if ( init_audio == 0 )
 289         {
 290                 bytes = ( samples * channels * 2 );
 291                 pthread_mutex_lock( &this->audio_mutex );
 292                 while ( bytes > ( sizeof( this->audio_buffer) - this->audio_avail ) )
 293                         pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 294                 mlt_properties properties = mlt_frame_properties( frame );
 295                 if ( mlt_properties_get_double( properties, "_speed" ) == 1 )
 296                         memcpy( &this->audio_buffer[ this->audio_avail ], pcm, bytes );
 297                 else
 298                         memset( &this->audio_buffer[ this->audio_avail ], 0, bytes );
 299                 this->audio_avail += bytes;
 300                 pthread_cond_broadcast( &this->audio_cond );
 301                 pthread_mutex_unlock( &this->audio_mutex );
 302         }
 303         else
 304         {
 305                 this->playing = 1;
 306         }
 307
 308         return init_audio;
 309 }
 310
 311 static int consumer_play_video( consumer_sdl this, mlt_frame frame )
 312 {
 313         // Get the properties of this consumer
 314         mlt_properties properties = this->properties;
 315
 316         mlt_image_format vfmt = mlt_image_yuv422;
 317         int width = this->width, height = this->height;
 318         uint8_t *image;
 319         int changed = 0;
 320
 321         if ( mlt_properties_get_int( properties, "video_off" ) )
 322         {
 323                 mlt_frame_close( frame );
 324                 return 0;
 325         }
 326
 327         if ( this->count == this->size )
 328         {
 329                 this->size += 25;
 330                 this->queue = realloc( this->queue, sizeof( mlt_frame ) * this->size );
 331         }
 332         this->queue[ this->count ++ ] = frame;
 333
 334         if ( this->playing )
 335         {
 336                 // We're working on the oldest frame now
 337                 frame = this->queue[ 0 ];
 338
 339                 // Shunt the frames in the queue down
 340                 int i = 0;
 341                 for ( i = 1; i < this->count; i ++ )
 342                         this->queue[ i - 1 ] = this->queue[ i ];
 343                 this->count --;
 344
 345                 // Get the image, width and height
 346                 mlt_frame_get_image( frame, &image, &vfmt, &width, &height, 0 );
 347
 348                 if ( this->sdl_screen != NULL )
 349                 {
 350                         SDL_Event event;
 351
 352                         changed = consumer_get_dimensions( &this->window_width, &this->window_height );
 353
 354                         while ( SDL_PollEvent( &event ) )
 355                         {
 356                                 switch( event.type )
 357                                 {
 358                                         case SDL_VIDEORESIZE:
 359                                                 this->window_width = event.resize.w;
 360                                                 this->window_height = event.resize.h;
 361                                                 changed = 1;
 362                                                 break;
 363                                         case SDL_KEYDOWN:
 364                                                 {
 365                                                         mlt_producer producer = mlt_properties_get_data( properties, "transport_producer", NULL );
 366                                                         char keyboard[ 2 ] = " ";
 367                                                         void (*callback)( mlt_producer, char * ) = mlt_properties_get_data( properties, "transport_callback", NULL );
 368                                                         if ( callback != NULL && producer != NULL && event.key.keysym.unicode < 0x80 && event.key.keysym.unicode > 0 )
 369                                                         {
 370                                                                 keyboard[ 0 ] = ( char )event.key.keysym.unicode;
 371                                                                 callback( producer, keyboard );
 372                                                         }
 373                                                 }
 374                                                 break;
 375                                 }
 376                         }
 377
 378                 }
 379
 380                 if ( width != this->width || height != this->height )
 381                 {
 382                         this->width = width;
 383                         this->height = height;
 384                         changed = 1;
 385                 }
 386
 387                 if ( this->sdl_screen == NULL || changed )
 388                 {
 389                         double aspect_ratio = mlt_frame_get_aspect_ratio( frame );
 390                         float display_aspect_ratio = (float)width / (float)height;
 391                         SDL_Rect rect;
 392
 393                         if ( mlt_properties_get_double( properties, "aspect_ratio" ) )
 394                                 aspect_ratio = mlt_properties_get_double( properties, "aspect_ratio" );
 395
 396                         if ( aspect_ratio == 1 )
 397                         {
 398                                 rect.w = this->window_width;
 399                                 rect.h = this->window_height;
 400                         }
 401                         else if ( this->window_width < this->window_height * aspect_ratio )
 402                         {
 403                                 rect.w = this->window_width;
 404                                 rect.h = this->window_width / aspect_ratio;
 405                         }
 406                         else
 407                         {
 408                                 rect.w = this->window_height * aspect_ratio;
 409                                 rect.h = this->window_height;
 410                         }
 411
 412                         if ( mlt_properties_get_int( properties, "scale_overlay" ) )
 413                         {
 414                                 if ( ( float )rect.w * display_aspect_ratio < this->window_width )
 415                                         rect.w = ( int )( ( float )rect.w * display_aspect_ratio );
 416                                 else if ( ( float )rect.h * display_aspect_ratio < this->window_height )
 417                                         rect.h = ( int )( ( float )rect.h * display_aspect_ratio );
 418                         }
 419
 420                         rect.x = ( this->window_width - rect.w ) / 2;
 421                         rect.y = ( this->window_height - rect.h ) / 2;
 422
 423                         // Force an overlay recreation
 424                         if ( this->sdl_overlay != NULL )
 425                                 SDL_FreeYUVOverlay( this->sdl_overlay );
 426
 427                         // open SDL window with video overlay, if possible
 428                         this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 0, this->sdl_flags );
 429
 430                         if ( this->sdl_screen != NULL )
 431                         {
 432                                 SDL_SetClipRect( this->sdl_screen, &rect );
 433
 434                                 sdl_lock_display();
 435                                 this->sdl_overlay = SDL_CreateYUVOverlay( this->width - (this->width % 4), this->height- (this->height % 2 ), SDL_YUY2_OVERLAY, this->sdl_screen );
 436                                 sdl_unlock_display();
 437                         }
 438                 }
 439
 440                 if ( this->sdl_screen != NULL && this->sdl_overlay != NULL )
 441                 {
 442                         this->buffer = this->sdl_overlay->pixels[ 0 ];
 443                         if ( SDL_LockYUVOverlay( this->sdl_overlay ) >= 0 )
 444                         {
 445                                 mlt_resize_yuv422( this->buffer, this->width - (this->width % 4 ), this->height- (this->height % 2 ), image, width, height );
 446                                 SDL_UnlockYUVOverlay( this->sdl_overlay );
 447                                 SDL_DisplayYUVOverlay( this->sdl_overlay, &this->sdl_screen->clip_rect );
 448                         }
 449                 }
 450         }
 451         else
 452         {
 453                 frame = NULL;
 454         }
 455
 456         // Close the frame
 457         if ( frame != NULL )
 458                 mlt_frame_close( frame );
 459
 460         if ( this->count )
 461                 mlt_frame_get_image( this->queue[ this->count - 1 ], &image, &vfmt, &width, &height, 0 );
 462
 463         return 0;
 464 }
 465
 466 /** Threaded wrapper for pipe.
 467 */
 468
 469 static void *consumer_thread( void *arg )
 470 {
 471         // Identify the arg
 472         consumer_sdl this = arg;
 473
 474         // Get the consumer
 475         mlt_consumer consumer = &this->parent;
 476
 477         // internal intialization
 478         int init_audio = 1;
 479
 480         if ( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_NOPARACHUTE ) < 0 )
 481         {
 482                 fprintf( stderr, "Failed to initialize SDL: %s\n", SDL_GetError() );
 483                 return NULL;
 484         }
 485
 486         // Loop until told not to
 487         while( this->running )
 488         {
 489                 // Get a frame from the attached producer
 490                 mlt_frame frame = mlt_consumer_get_frame( consumer );
 491
 492                 // Ensure that we have a frame
 493                 if ( frame != NULL )
 494                 {
 495                         init_audio = consumer_play_audio( this, frame, init_audio );
 496                         consumer_play_video( this, frame );
 497                 }
 498         }
 499
 500         // internal cleanup
 501         if ( init_audio == 0 )
 502                 SDL_AudioQuit( );
 503         if ( this->sdl_overlay != NULL )
 504                 SDL_FreeYUVOverlay( this->sdl_overlay );
 505         SDL_Quit( );
 506
 507         this->sdl_screen = NULL;
 508         this->sdl_overlay = NULL;
 509         this->audio_avail = 0;
 510
 511         return NULL;
 512 }
 513
 514 static int consumer_get_dimensions( int *width, int *height )
 515 {
 516         int changed = 0;
 517
 518         // SDL windows manager structure
 519         SDL_SysWMinfo wm;
 520
 521         // Specify the SDL Version
 522         SDL_VERSION( &wm.version );
 523
 524         // Get the wm structure
 525         if ( SDL_GetWMInfo( &wm ) == 1 )
 526         {
 527                 // Check that we have the X11 wm
 528                 if ( wm.subsystem == SDL_SYSWM_X11 )
 529                 {
 530                         // Get the SDL window
 531                         Window window = wm.info.x11.window;
 532
 533                         // Get the display session
 534                         Display *display = wm.info.x11.display;
 535
 536                         // Get the window attributes
 537                         XWindowAttributes attr;
 538                         XGetWindowAttributes( display, window, &attr );
 539
 540                         // Determine whether window has changed
 541                         changed = *width != attr.width || *height != attr.height;
 542
 543                         // Return width and height
 544                         *width = attr.width;
 545                         *height = attr.height;
 546                 }
 547         }
 548
 549         return changed;
 550 }
 551
 552 /** Callback to allow override of the close method.
 553 */
 554
 555 static void consumer_close( mlt_consumer parent )
 556 {
 557         // Get the actual object
 558         consumer_sdl this = parent->child;
 559
 560         // Stop the consumer
 561         mlt_consumer_stop( parent );
 562
 563         // Destroy mutexes
 564         pthread_mutex_destroy( &this->audio_mutex );
 565         pthread_cond_destroy( &this->audio_cond );
 566
 567         // Now clean up the rest
 568         mlt_consumer_close( parent );
 569
 570         // Finally clean up this
 571         free( this );
 572 }
 573