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 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                 // Get the parent consumer object
  82                 mlt_consumer parent = &this->parent;
  83
  84                 // We have stuff to clean up, so override the close method
  85                 parent->close = consumer_close;
  86
  87                 // get a handle on properties
  88                 mlt_service service = mlt_consumer_service( parent );
  89                 this->properties = mlt_service_properties( service );
  90
  91                 // Set the default volume
  92                 mlt_properties_set_double( this->properties, "volume", 1.0 );
  93
  94                 // This is the initialisation of the consumer
  95                 this->running = 1;
  96                 pthread_mutex_init( &this->audio_mutex, NULL );
  97                 pthread_cond_init( &this->audio_cond, NULL);
  98
  99                 // process actual param
 100                 if ( arg == NULL || !strcmp( arg, "PAL" ) )
 101                 {
 102                         this->width = 720;
 103                         this->height = 576;
 104                 }
 105                 else if ( !strcmp( arg, "NTSC" ) )
 106                 {
 107                         this->width = 720;
 108                         this->height = 480;
 109                 }
 110                 else if ( sscanf( arg, "%dx%d", &this->width, &this->height ) != 2 )
 111                 {
 112                         this->width = 720;
 113                         this->height = 576;
 114                 }
 115
 116                 // Default window size and aspect ratio
 117                 this->aspect_ratio = 4.0 / 3.0;
 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_DOUBLEBUF | SDL_HWACCEL | SDL_RESIZABLE;
 123
 124                 // Create the the thread
 125                 pthread_create( &this->thread, NULL, consumer_thread, this );
 126
 127                 // Return the consumer produced
 128                 return parent;
 129         }
 130
 131         // malloc or consumer init failed
 132         free( this );
 133
 134         // Indicate failure
 135         return NULL;
 136 }
 137
 138 static int sdl_lock_display( )
 139 {
 140         SDL_Surface *screen = SDL_GetVideoSurface( );
 141         return screen != NULL && ( !SDL_MUSTLOCK( screen ) || SDL_LockSurface( screen ) >= 0 );
 142 }
 143
 144 static void sdl_unlock_display( )
 145 {
 146         SDL_Surface *screen = SDL_GetVideoSurface( );
 147         if ( screen != NULL && SDL_MUSTLOCK( screen ) )
 148                 SDL_UnlockSurface( screen );
 149 }
 150
 151 static void sdl_fill_audio( void *udata, uint8_t *stream, int len )
 152 {
 153         consumer_sdl this = udata;
 154
 155         // Get the volume
 156         float volume = mlt_properties_get_double( this->properties, "volume" );
 157
 158         pthread_mutex_lock( &this->audio_mutex );
 159
 160         // Block until audio received
 161         while ( this->running && len > this->audio_avail )
 162                 pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 163
 164         if ( this->audio_avail >= len )
 165         {
 166                 // Place in the audio buffer
 167                 SDL_MixAudio( stream, this->audio_buffer, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 168
 169                 // Remove len from the audio available
 170                 this->audio_avail -= len;
 171
 172                 // Remove the samples
 173                 memmove( this->audio_buffer, this->audio_buffer + len, this->audio_avail );
 174         }
 175         else
 176         {
 177                 // Just to be safe, wipe the stream first
 178                 memset( stream, 0, len );
 179
 180                 // Copy what we have into the stream
 181                 memcpy( stream, this->audio_buffer, this->audio_avail );
 182
 183                 // Mix the audio
 184                 SDL_MixAudio( stream, stream, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 185
 186                 // No audio left
 187                 this->audio_avail = 0;
 188         }
 189
 190         // We're definitely playing now
 191         this->playing = 1;
 192
 193         pthread_cond_broadcast( &this->audio_cond );
 194         pthread_mutex_unlock( &this->audio_mutex );
 195 }
 196
 197 static int consumer_play_audio( consumer_sdl this, mlt_frame frame, int init_audio )
 198 {
 199         // Get the properties of this consumer
 200         mlt_properties properties = this->properties;
 201         mlt_audio_format afmt = mlt_audio_pcm;
 202         int channels;
 203         int samples;
 204         int frequency;
 205         int16_t *pcm;
 206         int bytes;
 207
 208         mlt_frame_get_audio( frame, &pcm, &afmt, &frequency, &channels, &samples );
 209
 210         if ( mlt_properties_get_int( properties, "audio_off" ) )
 211         {
 212                 this->playing = 1;
 213                 return init_audio;
 214         }
 215
 216         if ( init_audio == 1 )
 217         {
 218                 SDL_AudioSpec request;
 219                 SDL_AudioSpec got;
 220
 221                 // specify audio format
 222                 memset( &request, 0, sizeof( SDL_AudioSpec ) );
 223                 this->playing = 0;
 224                 request.freq = frequency;
 225                 request.format = AUDIO_S16;
 226                 request.channels = channels;
 227                 request.samples = 1024;
 228                 request.callback = sdl_fill_audio;
 229                 request.userdata = (void *)this;
 230                 if ( SDL_OpenAudio( &request, &got ) != 0 )
 231                 {
 232                         fprintf( stderr, "SDL failed to open audio: %s\n", SDL_GetError() );
 233                         init_audio = 2;
 234                 }
 235                 else
 236                 {
 237                         if ( got.size != 0 )
 238                         {
 239                                 SDL_PauseAudio( 0 );
 240                                 init_audio = 0;
 241                         }
 242                 }
 243         }
 244
 245         if ( init_audio == 0 )
 246         {
 247                 bytes = ( samples * channels * 2 );
 248                 pthread_mutex_lock( &this->audio_mutex );
 249                 while ( bytes > ( sizeof( this->audio_buffer) - this->audio_avail ) )
 250                         pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 251                 mlt_properties properties = mlt_frame_properties( frame );
 252                 if ( mlt_properties_get_double( properties, "speed" ) == 1 )
 253                         memcpy( &this->audio_buffer[ this->audio_avail ], pcm, bytes );
 254                 else
 255                         memset( &this->audio_buffer[ this->audio_avail ], 0, bytes );
 256                 this->audio_avail += bytes;
 257                 pthread_cond_broadcast( &this->audio_cond );
 258                 pthread_mutex_unlock( &this->audio_mutex );
 259         }
 260         else
 261         {
 262                 this->playing = 1;
 263         }
 264
 265         return init_audio;
 266 }
 267
 268 static int consumer_play_video( consumer_sdl this, mlt_frame frame )
 269 {
 270         // Get the properties of this consumer
 271         mlt_properties properties = this->properties;
 272
 273         mlt_image_format vfmt = mlt_image_yuv422;
 274         int width = this->width, height = this->height;
 275         uint8_t *image;
 276         int changed = 0;
 277
 278         if ( mlt_properties_get_int( properties, "video_off" ) )
 279         {
 280                 mlt_frame_close( frame );
 281                 return 0;
 282         }
 283
 284         if ( this->count == this->size )
 285         {
 286                 this->size += 25;
 287                 this->queue = realloc( this->queue, sizeof( mlt_frame ) * this->size );
 288         }
 289         this->queue[ this->count ++ ] = frame;
 290
 291         if ( this->playing )
 292         {
 293                 // We're working on the oldest frame now
 294                 frame = this->queue[ 0 ];
 295
 296                 // Shunt the frames in the queue down
 297                 int i = 0;
 298                 for ( i = 1; i < this->count; i ++ )
 299                         this->queue[ i - 1 ] = this->queue[ i ];
 300                 this->count --;
 301
 302                 // Get the image, width and height
 303                 mlt_frame_get_image( frame, &image, &vfmt, &width, &height, 0 );
 304
 305                 if ( this->sdl_screen != NULL )
 306                 {
 307                         SDL_Event event;
 308
 309                         changed = consumer_get_dimensions( &this->window_width, &this->window_height );
 310
 311                         while ( SDL_PollEvent( &event ) )
 312                         {
 313                                 switch( event.type )
 314                                 {
 315                                         case SDL_VIDEORESIZE:
 316                                                 this->window_width = event.resize.w;
 317                                                 this->window_height = event.resize.h;
 318                                                 changed = 1;
 319                                                 break;
 320                                         case SDL_KEYDOWN:
 321                                                 {
 322                                                         mlt_producer producer = mlt_properties_get_data( properties, "transport_producer", NULL );
 323                                                         void (*callback)( mlt_producer, char * ) = mlt_properties_get_data( properties, "transport_callback", NULL );
 324                                                         if ( callback != NULL && producer != NULL )
 325                                                                 callback( producer, SDL_GetKeyName(event.key.keysym.sym) );
 326                                                 }
 327                                                 break;
 328                                 }
 329                         }
 330
 331                 }
 332
 333                 if ( width != this->width || height != this->height )
 334                 {
 335                         this->width = width;
 336                         this->height = height;
 337                         changed = 1;
 338                 }
 339
 340                 if ( this->sdl_screen == NULL || changed )
 341                 {
 342                         double aspect_ratio = mlt_frame_get_aspect_ratio( frame );
 343                         float display_aspect_ratio = (float)width / (float)height;
 344                         SDL_Rect rect;
 345
 346                         if ( mlt_properties_get_double( properties, "aspect_ratio" ) )
 347                                 aspect_ratio = mlt_properties_get_double( properties, "aspect_ratio" );
 348
 349                         if ( aspect_ratio == 1 )
 350                         {
 351                                 rect.w = this->window_width;
 352                                 rect.h = this->window_height;
 353                         }
 354                         else if ( this->window_width < this->window_height * aspect_ratio )
 355                         {
 356                                 rect.w = this->window_width;
 357                                 rect.h = this->window_width / aspect_ratio;
 358                         }
 359                         else
 360                         {
 361                                 rect.w = this->window_height * aspect_ratio;
 362                                 rect.h = this->window_height;
 363                         }
 364
 365                         if ( mlt_properties_get_int( properties, "scale_overlay" ) )
 366                         {
 367                                 if ( ( float )rect.w * display_aspect_ratio < this->window_width )
 368                                         rect.w = ( int )( ( float )rect.w * display_aspect_ratio );
 369                                 else if ( ( float )rect.h * display_aspect_ratio < this->window_height )
 370                                         rect.h = ( int )( ( float )rect.h * display_aspect_ratio );
 371                         }
 372
 373                         rect.x = ( this->window_width - rect.w ) / 2;
 374                         rect.y = ( this->window_height - rect.h ) / 2;
 375
 376                         // Force an overlay recreation
 377                         if ( this->sdl_overlay != NULL )
 378                                 SDL_FreeYUVOverlay( this->sdl_overlay );
 379
 380                         // open SDL window with video overlay, if possible
 381                         this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 0, this->sdl_flags );
 382
 383                         if ( this->sdl_screen != NULL )
 384                         {
 385                                 SDL_SetClipRect( this->sdl_screen, &rect );
 386
 387                                 sdl_lock_display();
 388                                 this->sdl_overlay = SDL_CreateYUVOverlay( this->width - (this->width % 4), this->height- (this->height % 2 ), SDL_YUY2_OVERLAY, this->sdl_screen );
 389                                 sdl_unlock_display();
 390                         }
 391                 }
 392
 393                 if ( this->sdl_screen != NULL && this->sdl_overlay != NULL )
 394                 {
 395                         this->buffer = this->sdl_overlay->pixels[ 0 ];
 396                         if ( SDL_LockYUVOverlay( this->sdl_overlay ) >= 0 )
 397                         {
 398                                 mlt_resize_yuv422( this->buffer, this->width - (this->width % 4 ), this->height- (this->height % 2 ), image, width, height );
 399                                 SDL_UnlockYUVOverlay( this->sdl_overlay );
 400                                 SDL_DisplayYUVOverlay( this->sdl_overlay, &this->sdl_screen->clip_rect );
 401                         }
 402                 }
 403         }
 404         else
 405         {
 406                 frame = NULL;
 407         }
 408
 409         // Close the frame
 410         if ( frame != NULL )
 411                 mlt_frame_close( frame );
 412
 413         if ( this->count )
 414                 mlt_frame_get_image( this->queue[ this->count - 1 ], &image, &vfmt, &width, &height, 0 );
 415
 416         return 0;
 417 }
 418
 419 /** Threaded wrapper for pipe.
 420 */
 421
 422 static void *consumer_thread( void *arg )
 423 {
 424         // Identify the arg
 425         consumer_sdl this = arg;
 426
 427         // Get the consumer
 428         mlt_consumer consumer = &this->parent;
 429
 430         // Get the service assoicated to the consumer
 431         mlt_service service = mlt_consumer_service( consumer );
 432
 433         // Define a frame pointer
 434         mlt_frame frame;
 435
 436         // internal intialization
 437         int init_audio = 1;
 438
 439         if ( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_NOPARACHUTE ) < 0 )
 440         {
 441                 fprintf( stderr, "Failed to initialize SDL: %s\n", SDL_GetError() );
 442                 return NULL;
 443         }
 444
 445         // Loop until told not to
 446         while( this->running )
 447         {
 448                 // Get a frame from the service (should never return anything other than 0)
 449                 if ( mlt_service_get_frame( service, &frame, 0 ) == 0 )
 450                 {
 451                         init_audio = consumer_play_audio( this, frame, init_audio );
 452                         consumer_play_video( this, frame );
 453                 }
 454         }
 455
 456         // internal cleanup
 457         if ( init_audio == 0 )
 458                 SDL_AudioQuit( );
 459         if ( this->sdl_overlay != NULL )
 460                 SDL_FreeYUVOverlay( this->sdl_overlay );
 461         SDL_Quit( );
 462
 463         return NULL;
 464 }
 465
 466 static int consumer_get_dimensions( int *width, int *height )
 467 {
 468         int changed = 0;
 469
 470         // SDL windows manager structure
 471         SDL_SysWMinfo wm;
 472
 473         // Specify the SDL Version
 474         SDL_VERSION( &wm.version );
 475
 476         // Get the wm structure
 477         if ( SDL_GetWMInfo( &wm ) == 1 )
 478         {
 479                 // Check that we have the X11 wm
 480                 if ( wm.subsystem == SDL_SYSWM_X11 )
 481                 {
 482                         // Get the SDL window
 483                         Window window = wm.info.x11.window;
 484
 485                         // Get the display session
 486                         Display *display = wm.info.x11.display;
 487
 488                         // Get the window attributes
 489                         XWindowAttributes attr;
 490                         XGetWindowAttributes( display, window, &attr );
 491
 492                         // Determine whether window has changed
 493                         changed = *width != attr.width || *height != attr.height;
 494
 495                         // Return width and height
 496                         *width = attr.width;
 497                         *height = attr.height;
 498                 }
 499         }
 500
 501         return changed;
 502 }
 503
 504 /** Callback to allow override of the close method.
 505 */
 506
 507 static void consumer_close( mlt_consumer parent )
 508 {
 509         // Get the actual object
 510         consumer_sdl this = parent->child;
 511
 512         // Kill the thread and clean up
 513         this->running = 0;
 514
 515         pthread_mutex_lock( &this->audio_mutex );
 516         pthread_cond_broadcast( &this->audio_cond );
 517         pthread_mutex_unlock( &this->audio_mutex );
 518
 519         pthread_join( this->thread, NULL );
 520         pthread_mutex_destroy( &this->audio_mutex );
 521         pthread_cond_destroy( &this->audio_cond );
 522
 523         // Now clean up the rest (the close = NULL is a bit nasty but needed for now)
 524         parent->close = NULL;
 525         mlt_consumer_close( parent );
 526
 527         // Finally clean up this
 528         free( this );
 529 }
 530