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 fps
 102                 mlt_properties_set_double( this->properties, "fps", 25 );
 103
 104                 // process actual param
 105                 if ( arg == NULL || !strcmp( arg, "PAL" ) )
 106                 {
 107                         this->width = 720;
 108                         this->height = 576;
 109                 }
 110                 else if ( !strcmp( arg, "NTSC" ) )
 111                 {
 112                         this->width = 720;
 113                         this->height = 480;
 114                         mlt_properties_set_double( this->properties, "fps", 29.97 );
 115                 }
 116                 else if ( sscanf( arg, "%dx%d", &this->width, &this->height ) != 2 )
 117                 {
 118                         this->width = 720;
 119                         this->height = 576;
 120                 }
 121
 122                 // Default window size and aspect ratio
 123                 this->aspect_ratio = 4.0 / 3.0;
 124                 this->window_width = (int)( (float)this->height * this->aspect_ratio ) + 1;
 125                 this->window_height = this->height;
 126
 127                 // Set the sdl flags
 128                 this->sdl_flags = SDL_HWSURFACE | SDL_DOUBLEBUF | SDL_HWACCEL | SDL_RESIZABLE;
 129
 130                 // Allow thread to be started/stopped
 131                 parent->start = consumer_start;
 132                 parent->stop = consumer_stop;
 133                 parent->is_stopped = consumer_is_stopped;
 134
 135                 // Return the consumer produced
 136                 return parent;
 137         }
 138
 139         // malloc or consumer init failed
 140         free( this );
 141
 142         // Indicate failure
 143         return NULL;
 144 }
 145
 146 int consumer_start( mlt_consumer parent )
 147 {
 148         consumer_sdl this = parent->child;
 149
 150         if ( !this->running )
 151         {
 152                 this->running = 1;
 153                 pthread_create( &this->thread, NULL, consumer_thread, this );
 154         }
 155
 156         return 0;
 157 }
 158
 159 int consumer_stop( mlt_consumer parent )
 160 {
 161         // Get the actual object
 162         consumer_sdl this = parent->child;
 163
 164         if ( this->running )
 165         {
 166                 // Kill the thread and clean up
 167                 this->running = 0;
 168
 169                 pthread_mutex_lock( &this->audio_mutex );
 170                 pthread_cond_broadcast( &this->audio_cond );
 171                 pthread_mutex_unlock( &this->audio_mutex );
 172
 173                 pthread_join( this->thread, NULL );
 174         }
 175
 176         return 0;
 177 }
 178
 179 int consumer_is_stopped( mlt_consumer parent )
 180 {
 181         consumer_sdl this = parent->child;
 182         return !this->running;
 183 }
 184
 185 static int sdl_lock_display( )
 186 {
 187         SDL_Surface *screen = SDL_GetVideoSurface( );
 188         return screen != NULL && ( !SDL_MUSTLOCK( screen ) || SDL_LockSurface( screen ) >= 0 );
 189 }
 190
 191 static void sdl_unlock_display( )
 192 {
 193         SDL_Surface *screen = SDL_GetVideoSurface( );
 194         if ( screen != NULL && SDL_MUSTLOCK( screen ) )
 195                 SDL_UnlockSurface( screen );
 196 }
 197
 198 static void sdl_fill_audio( void *udata, uint8_t *stream, int len )
 199 {
 200         consumer_sdl this = udata;
 201
 202         // Get the volume
 203         float volume = mlt_properties_get_double( this->properties, "volume" );
 204
 205         pthread_mutex_lock( &this->audio_mutex );
 206
 207         // Block until audio received
 208         while ( this->running && len > this->audio_avail )
 209                 pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 210
 211         if ( this->audio_avail >= len )
 212         {
 213                 // Place in the audio buffer
 214                 SDL_MixAudio( stream, this->audio_buffer, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 215
 216                 // Remove len from the audio available
 217                 this->audio_avail -= len;
 218
 219                 // Remove the samples
 220                 memmove( this->audio_buffer, this->audio_buffer + len, this->audio_avail );
 221         }
 222         else
 223         {
 224                 // Just to be safe, wipe the stream first
 225                 memset( stream, 0, len );
 226
 227                 // Copy what we have into the stream
 228                 memcpy( stream, this->audio_buffer, this->audio_avail );
 229
 230                 // Mix the audio
 231                 SDL_MixAudio( stream, stream, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 232
 233                 // No audio left
 234                 this->audio_avail = 0;
 235         }
 236
 237         // We're definitely playing now
 238         this->playing = 1;
 239
 240         pthread_cond_broadcast( &this->audio_cond );
 241         pthread_mutex_unlock( &this->audio_mutex );
 242 }
 243
 244 static int consumer_play_audio( consumer_sdl this, mlt_frame frame, int init_audio )
 245 {
 246         // Get the properties of this consumer
 247         mlt_properties properties = this->properties;
 248         mlt_audio_format afmt = mlt_audio_pcm;
 249
 250         // Set the preferred params of the test card signal
 251         int channels = 2;
 252         int frequency = 48000;
 253         static int counter = 0;
 254         if ( mlt_properties_get_int( properties, "frequency" ) != 0 )
 255                 frequency =  mlt_properties_get_int( properties, "frequency" );
 256
 257         int samples = mlt_sample_calculator( mlt_properties_get_double( this->properties, "fps" ), frequency, counter++ );
 258
 259         int16_t *pcm;
 260         int bytes;
 261
 262         mlt_frame_get_audio( frame, &pcm, &afmt, &frequency, &channels, &samples );
 263
 264         if ( mlt_properties_get_int( properties, "audio_off" ) )
 265         {
 266                 this->playing = 1;
 267                 return init_audio;
 268         }
 269
 270         if ( init_audio == 1 )
 271         {
 272                 SDL_AudioSpec request;
 273                 SDL_AudioSpec got;
 274
 275                 SDL_EnableKeyRepeat( SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL );
 276                 SDL_EnableUNICODE( 1 );
 277
 278                 // specify audio format
 279                 memset( &request, 0, sizeof( SDL_AudioSpec ) );
 280                 this->playing = 0;
 281                 request.freq = frequency;
 282                 request.format = AUDIO_S16;
 283                 request.channels = channels;
 284                 request.samples = 1024;
 285                 request.callback = sdl_fill_audio;
 286                 request.userdata = (void *)this;
 287                 if ( SDL_OpenAudio( &request, &got ) != 0 )
 288                 {
 289                         fprintf( stderr, "SDL failed to open audio: %s\n", SDL_GetError() );
 290                         init_audio = 2;
 291                 }
 292                 else if ( got.size != 0 )
 293                 {
 294                         SDL_PauseAudio( 0 );
 295                         init_audio = 0;
 296                 }
 297         }
 298
 299         if ( init_audio == 0 )
 300         {
 301                 bytes = ( samples * channels * 2 );
 302                 pthread_mutex_lock( &this->audio_mutex );
 303                 while ( bytes > ( sizeof( this->audio_buffer) - this->audio_avail ) )
 304                         pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 305                 mlt_properties properties = mlt_frame_properties( frame );
 306                 if ( mlt_properties_get_double( properties, "speed" ) == 1 )
 307                         memcpy( &this->audio_buffer[ this->audio_avail ], pcm, bytes );
 308                 else
 309                         memset( &this->audio_buffer[ this->audio_avail ], 0, bytes );
 310                 this->audio_avail += bytes;
 311                 pthread_cond_broadcast( &this->audio_cond );
 312                 pthread_mutex_unlock( &this->audio_mutex );
 313         }
 314         else
 315         {
 316                 this->playing = 1;
 317         }
 318
 319         return init_audio;
 320 }
 321
 322 static int consumer_play_video( consumer_sdl this, mlt_frame frame )
 323 {
 324         // Get the properties of this consumer
 325         mlt_properties properties = this->properties;
 326
 327         mlt_image_format vfmt = mlt_image_yuv422;
 328         int width = this->width, height = this->height;
 329         uint8_t *image;
 330         int changed = 0;
 331
 332         if ( mlt_properties_get_int( properties, "video_off" ) )
 333         {
 334                 mlt_frame_close( frame );
 335                 return 0;
 336         }
 337
 338         if ( this->count == this->size )
 339         {
 340                 this->size += 25;
 341                 this->queue = realloc( this->queue, sizeof( mlt_frame ) * this->size );
 342         }
 343         this->queue[ this->count ++ ] = frame;
 344
 345         if ( this->playing )
 346         {
 347                 // We're working on the oldest frame now
 348                 frame = this->queue[ 0 ];
 349
 350                 // Shunt the frames in the queue down
 351                 int i = 0;
 352                 for ( i = 1; i < this->count; i ++ )
 353                         this->queue[ i - 1 ] = this->queue[ i ];
 354                 this->count --;
 355
 356                 // Get the image, width and height
 357                 mlt_frame_get_image( frame, &image, &vfmt, &width, &height, 0 );
 358
 359                 if ( this->sdl_screen != NULL )
 360                 {
 361                         SDL_Event event;
 362
 363                         changed = consumer_get_dimensions( &this->window_width, &this->window_height );
 364
 365                         while ( SDL_PollEvent( &event ) )
 366                         {
 367                                 switch( event.type )
 368                                 {
 369                                         case SDL_VIDEORESIZE:
 370                                                 this->window_width = event.resize.w;
 371                                                 this->window_height = event.resize.h;
 372                                                 changed = 1;
 373                                                 break;
 374                                         case SDL_KEYDOWN:
 375                                                 {
 376                                                         mlt_producer producer = mlt_properties_get_data( properties, "transport_producer", NULL );
 377                                                         char keyboard[ 2 ] = " ";
 378                                                         void (*callback)( mlt_producer, char * ) = mlt_properties_get_data( properties, "transport_callback", NULL );
 379                                                         if ( callback != NULL && producer != NULL && event.key.keysym.unicode < 0x80 && event.key.keysym.unicode > 0 )
 380                                                         {
 381                                                                 keyboard[ 0 ] = ( char )event.key.keysym.unicode;
 382                                                                 callback( producer, keyboard );
 383                                                         }
 384                                                 }
 385                                                 break;
 386                                 }
 387                         }
 388
 389                 }
 390
 391                 if ( width != this->width || height != this->height )
 392                 {
 393                         this->width = width;
 394                         this->height = height;
 395                         changed = 1;
 396                 }
 397
 398                 if ( this->sdl_screen == NULL || changed )
 399                 {
 400                         double aspect_ratio = mlt_frame_get_aspect_ratio( frame );
 401                         float display_aspect_ratio = (float)width / (float)height;
 402                         SDL_Rect rect;
 403
 404                         if ( mlt_properties_get_double( properties, "aspect_ratio" ) )
 405                                 aspect_ratio = mlt_properties_get_double( properties, "aspect_ratio" );
 406
 407                         if ( aspect_ratio == 1 )
 408                         {
 409                                 rect.w = this->window_width;
 410                                 rect.h = this->window_height;
 411                         }
 412                         else if ( this->window_width < this->window_height * aspect_ratio )
 413                         {
 414                                 rect.w = this->window_width;
 415                                 rect.h = this->window_width / aspect_ratio;
 416                         }
 417                         else
 418                         {
 419                                 rect.w = this->window_height * aspect_ratio;
 420                                 rect.h = this->window_height;
 421                         }
 422
 423                         if ( mlt_properties_get_int( properties, "scale_overlay" ) )
 424                         {
 425                                 if ( ( float )rect.w * display_aspect_ratio < this->window_width )
 426                                         rect.w = ( int )( ( float )rect.w * display_aspect_ratio );
 427                                 else if ( ( float )rect.h * display_aspect_ratio < this->window_height )
 428                                         rect.h = ( int )( ( float )rect.h * display_aspect_ratio );
 429                         }
 430
 431                         rect.x = ( this->window_width - rect.w ) / 2;
 432                         rect.y = ( this->window_height - rect.h ) / 2;
 433
 434                         // Force an overlay recreation
 435                         if ( this->sdl_overlay != NULL )
 436                                 SDL_FreeYUVOverlay( this->sdl_overlay );
 437
 438                         // open SDL window with video overlay, if possible
 439                         this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 0, this->sdl_flags );
 440
 441                         if ( this->sdl_screen != NULL )
 442                         {
 443                                 SDL_SetClipRect( this->sdl_screen, &rect );
 444
 445                                 sdl_lock_display();
 446                                 this->sdl_overlay = SDL_CreateYUVOverlay( this->width - (this->width % 4), this->height- (this->height % 2 ), SDL_YUY2_OVERLAY, this->sdl_screen );
 447                                 sdl_unlock_display();
 448                         }
 449                 }
 450
 451                 if ( this->sdl_screen != NULL && this->sdl_overlay != NULL )
 452                 {
 453                         this->buffer = this->sdl_overlay->pixels[ 0 ];
 454                         if ( SDL_LockYUVOverlay( this->sdl_overlay ) >= 0 )
 455                         {
 456                                 mlt_resize_yuv422( this->buffer, this->width - (this->width % 4 ), this->height- (this->height % 2 ), image, width, height );
 457                                 SDL_UnlockYUVOverlay( this->sdl_overlay );
 458                                 SDL_DisplayYUVOverlay( this->sdl_overlay, &this->sdl_screen->clip_rect );
 459                         }
 460                 }
 461         }
 462         else
 463         {
 464                 frame = NULL;
 465         }
 466
 467         // Close the frame
 468         if ( frame != NULL )
 469                 mlt_frame_close( frame );
 470
 471         if ( this->count )
 472                 mlt_frame_get_image( this->queue[ this->count - 1 ], &image, &vfmt, &width, &height, 0 );
 473
 474         return 0;
 475 }
 476
 477 /** Threaded wrapper for pipe.
 478 */
 479
 480 static void *consumer_thread( void *arg )
 481 {
 482         // Identify the arg
 483         consumer_sdl this = arg;
 484
 485         // Get the consumer
 486         mlt_consumer consumer = &this->parent;
 487
 488         // Get the service assoicated to the consumer
 489         mlt_service service = mlt_consumer_service( consumer );
 490
 491         // Define a frame pointer
 492         mlt_frame frame;
 493
 494         // internal intialization
 495         int init_audio = 1;
 496
 497         if ( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_NOPARACHUTE ) < 0 )
 498         {
 499                 fprintf( stderr, "Failed to initialize SDL: %s\n", SDL_GetError() );
 500                 return NULL;
 501         }
 502
 503         // Loop until told not to
 504         while( this->running )
 505         {
 506                 // Get a frame from the service (should never return anything other than 0)
 507                 if ( mlt_service_get_frame( service, &frame, 0 ) == 0 )
 508                 {
 509                         init_audio = consumer_play_audio( this, frame, init_audio );
 510                         consumer_play_video( this, frame );
 511                 }
 512         }
 513
 514         // internal cleanup
 515         if ( init_audio == 0 )
 516                 SDL_AudioQuit( );
 517         if ( this->sdl_overlay != NULL )
 518                 SDL_FreeYUVOverlay( this->sdl_overlay );
 519         SDL_Quit( );
 520
 521         this->sdl_screen = NULL;
 522         this->sdl_overlay = NULL;
 523         this->audio_avail = 0;
 524
 525         return NULL;
 526 }
 527
 528 static int consumer_get_dimensions( int *width, int *height )
 529 {
 530         int changed = 0;
 531
 532         // SDL windows manager structure
 533         SDL_SysWMinfo wm;
 534
 535         // Specify the SDL Version
 536         SDL_VERSION( &wm.version );
 537
 538         // Get the wm structure
 539         if ( SDL_GetWMInfo( &wm ) == 1 )
 540         {
 541                 // Check that we have the X11 wm
 542                 if ( wm.subsystem == SDL_SYSWM_X11 )
 543                 {
 544                         // Get the SDL window
 545                         Window window = wm.info.x11.window;
 546
 547                         // Get the display session
 548                         Display *display = wm.info.x11.display;
 549
 550                         // Get the window attributes
 551                         XWindowAttributes attr;
 552                         XGetWindowAttributes( display, window, &attr );
 553
 554                         // Determine whether window has changed
 555                         changed = *width != attr.width || *height != attr.height;
 556
 557                         // Return width and height
 558                         *width = attr.width;
 559                         *height = attr.height;
 560                 }
 561         }
 562
 563         return changed;
 564 }
 565
 566 /** Callback to allow override of the close method.
 567 */
 568
 569 static void consumer_close( mlt_consumer parent )
 570 {
 571         // Get the actual object
 572         consumer_sdl this = parent->child;
 573
 574         // Stop the consumer
 575         mlt_consumer_stop( parent );
 576
 577         // Destroy mutexes
 578         pthread_mutex_destroy( &this->audio_mutex );
 579         pthread_cond_destroy( &this->audio_cond );
 580
 581         // Now clean up the rest
 582         mlt_consumer_close( parent );
 583
 584         // Finally clean up this
 585         free( this );
 586 }
 587