research.m1stereo.tv/gitweb/ - melted/blob - mlt/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 = 0;
 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 if ( got.size != 0 )
 236                 {
 237                         SDL_PauseAudio( 0 );
 238                         init_audio = 0;
 239                 }
 240         }
 241
 242         if ( init_audio == 0 )
 243         {
 244                 bytes = ( samples * channels * 2 );
 245                 pthread_mutex_lock( &this->audio_mutex );
 246                 while ( bytes > ( sizeof( this->audio_buffer) - this->audio_avail ) )
 247                         pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 248                 mlt_properties properties = mlt_frame_properties( frame );
 249                 if ( mlt_properties_get_double( properties, "speed" ) == 1 )
 250                         memcpy( &this->audio_buffer[ this->audio_avail ], pcm, bytes );
 251                 else
 252                         memset( &this->audio_buffer[ this->audio_avail ], 0, bytes );
 253                 this->audio_avail += bytes;
 254                 pthread_cond_broadcast( &this->audio_cond );
 255                 pthread_mutex_unlock( &this->audio_mutex );
 256         }
 257         else
 258         {
 259                 this->playing = 1;
 260         }
 261
 262         return init_audio;
 263 }
 264
 265 static int consumer_play_video( consumer_sdl this, mlt_frame frame )
 266 {
 267         // Get the properties of this consumer
 268         mlt_properties properties = this->properties;
 269
 270         mlt_image_format vfmt = mlt_image_yuv422;
 271         int width = this->width, height = this->height;
 272         uint8_t *image;
 273         int changed = 0;
 274
 275         if ( mlt_properties_get_int( properties, "video_off" ) )
 276         {
 277                 mlt_frame_close( frame );
 278                 return 0;
 279         }
 280
 281         if ( this->count == this->size )
 282         {
 283                 this->size += 25;
 284                 this->queue = realloc( this->queue, sizeof( mlt_frame ) * this->size );
 285         }
 286         this->queue[ this->count ++ ] = frame;
 287
 288         if ( this->playing )
 289         {
 290                 // We're working on the oldest frame now
 291                 frame = this->queue[ 0 ];
 292
 293                 // Shunt the frames in the queue down
 294                 int i = 0;
 295                 for ( i = 1; i < this->count; i ++ )
 296                         this->queue[ i - 1 ] = this->queue[ i ];
 297                 this->count --;
 298
 299                 // Get the image, width and height
 300                 mlt_frame_get_image( frame, &image, &vfmt, &width, &height, 0 );
 301
 302                 if ( this->sdl_screen != NULL )
 303                 {
 304                         SDL_Event event;
 305
 306                         changed = consumer_get_dimensions( &this->window_width, &this->window_height );
 307
 308                         while ( SDL_PollEvent( &event ) )
 309                         {
 310                                 switch( event.type )
 311                                 {
 312                                         case SDL_VIDEORESIZE:
 313                                                 this->window_width = event.resize.w;
 314                                                 this->window_height = event.resize.h;
 315                                                 changed = 1;
 316                                                 break;
 317                                         case SDL_KEYDOWN:
 318                                                 {
 319                                                         mlt_producer producer = mlt_properties_get_data( properties, "transport_producer", NULL );
 320                                                         void (*callback)( mlt_producer, char * ) = mlt_properties_get_data( properties, "transport_callback", NULL );
 321                                                         if ( callback != NULL && producer != NULL )
 322                                                                 callback( producer, SDL_GetKeyName(event.key.keysym.sym) );
 323                                                 }
 324                                                 break;
 325                                 }
 326                         }
 327
 328                 }
 329
 330                 if ( width != this->width || height != this->height )
 331                 {
 332                         this->width = width;
 333                         this->height = height;
 334                         changed = 1;
 335                 }
 336
 337                 if ( this->sdl_screen == NULL || changed )
 338                 {
 339                         double aspect_ratio = mlt_frame_get_aspect_ratio( frame );
 340                         float display_aspect_ratio = (float)width / (float)height;
 341                         SDL_Rect rect;
 342
 343                         if ( mlt_properties_get_double( properties, "aspect_ratio" ) )
 344                                 aspect_ratio = mlt_properties_get_double( properties, "aspect_ratio" );
 345
 346                         if ( aspect_ratio == 1 )
 347                         {
 348                                 rect.w = this->window_width;
 349                                 rect.h = this->window_height;
 350                         }
 351                         else if ( this->window_width < this->window_height * aspect_ratio )
 352                         {
 353                                 rect.w = this->window_width;
 354                                 rect.h = this->window_width / aspect_ratio;
 355                         }
 356                         else
 357                         {
 358                                 rect.w = this->window_height * aspect_ratio;
 359                                 rect.h = this->window_height;
 360                         }
 361
 362                         if ( mlt_properties_get_int( properties, "scale_overlay" ) )
 363                         {
 364                                 if ( ( float )rect.w * display_aspect_ratio < this->window_width )
 365                                         rect.w = ( int )( ( float )rect.w * display_aspect_ratio );
 366                                 else if ( ( float )rect.h * display_aspect_ratio < this->window_height )
 367                                         rect.h = ( int )( ( float )rect.h * display_aspect_ratio );
 368                         }
 369
 370                         rect.x = ( this->window_width - rect.w ) / 2;
 371                         rect.y = ( this->window_height - rect.h ) / 2;
 372
 373                         // Force an overlay recreation
 374                         if ( this->sdl_overlay != NULL )
 375                                 SDL_FreeYUVOverlay( this->sdl_overlay );
 376
 377                         // open SDL window with video overlay, if possible
 378                         this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 0, this->sdl_flags );
 379
 380                         if ( this->sdl_screen != NULL )
 381                         {
 382                                 SDL_SetClipRect( this->sdl_screen, &rect );
 383
 384                                 sdl_lock_display();
 385                                 this->sdl_overlay = SDL_CreateYUVOverlay( this->width - (this->width % 4), this->height- (this->height % 2 ), SDL_YUY2_OVERLAY, this->sdl_screen );
 386                                 sdl_unlock_display();
 387                         }
 388                 }
 389
 390                 if ( this->sdl_screen != NULL && this->sdl_overlay != NULL )
 391                 {
 392                         this->buffer = this->sdl_overlay->pixels[ 0 ];
 393                         if ( SDL_LockYUVOverlay( this->sdl_overlay ) >= 0 )
 394                         {
 395                                 mlt_resize_yuv422( this->buffer, this->width - (this->width % 4 ), this->height- (this->height % 2 ), image, width, height );
 396                                 SDL_UnlockYUVOverlay( this->sdl_overlay );
 397                                 SDL_DisplayYUVOverlay( this->sdl_overlay, &this->sdl_screen->clip_rect );
 398                         }
 399                 }
 400         }
 401         else
 402         {
 403                 frame = NULL;
 404         }
 405
 406         // Close the frame
 407         if ( frame != NULL )
 408                 mlt_frame_close( frame );
 409
 410         if ( this->count )
 411                 mlt_frame_get_image( this->queue[ this->count - 1 ], &image, &vfmt, &width, &height, 0 );
 412
 413         return 0;
 414 }
 415
 416 /** Threaded wrapper for pipe.
 417 */
 418
 419 static void *consumer_thread( void *arg )
 420 {
 421         // Identify the arg
 422         consumer_sdl this = arg;
 423
 424         // Get the consumer
 425         mlt_consumer consumer = &this->parent;
 426
 427         // Get the service assoicated to the consumer
 428         mlt_service service = mlt_consumer_service( consumer );
 429
 430         // Define a frame pointer
 431         mlt_frame frame;
 432
 433         // internal intialization
 434         int init_audio = 1;
 435
 436         if ( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_NOPARACHUTE ) < 0 )
 437         {
 438                 fprintf( stderr, "Failed to initialize SDL: %s\n", SDL_GetError() );
 439                 return NULL;
 440         }
 441
 442         // Loop until told not to
 443         while( this->running )
 444         {
 445                 // Get a frame from the service (should never return anything other than 0)
 446                 if ( mlt_service_get_frame( service, &frame, 0 ) == 0 )
 447                 {
 448                         init_audio = consumer_play_audio( this, frame, init_audio );
 449                         consumer_play_video( this, frame );
 450                 }
 451         }
 452
 453         // internal cleanup
 454         if ( init_audio == 0 )
 455                 SDL_AudioQuit( );
 456         if ( this->sdl_overlay != NULL )
 457                 SDL_FreeYUVOverlay( this->sdl_overlay );
 458         SDL_Quit( );
 459
 460         return NULL;
 461 }
 462
 463 static int consumer_get_dimensions( int *width, int *height )
 464 {
 465         int changed = 0;
 466
 467         // SDL windows manager structure
 468         SDL_SysWMinfo wm;
 469
 470         // Specify the SDL Version
 471         SDL_VERSION( &wm.version );
 472
 473         // Get the wm structure
 474         if ( SDL_GetWMInfo( &wm ) == 1 )
 475         {
 476                 // Check that we have the X11 wm
 477                 if ( wm.subsystem == SDL_SYSWM_X11 )
 478                 {
 479                         // Get the SDL window
 480                         Window window = wm.info.x11.window;
 481
 482                         // Get the display session
 483                         Display *display = wm.info.x11.display;
 484
 485                         // Get the window attributes
 486                         XWindowAttributes attr;
 487                         XGetWindowAttributes( display, window, &attr );
 488
 489                         // Determine whether window has changed
 490                         changed = *width != attr.width || *height != attr.height;
 491
 492                         // Return width and height
 493                         *width = attr.width;
 494                         *height = attr.height;
 495                 }
 496         }
 497
 498         return changed;
 499 }
 500
 501 /** Callback to allow override of the close method.
 502 */
 503
 504 static void consumer_close( mlt_consumer parent )
 505 {
 506         // Get the actual object
 507         consumer_sdl this = parent->child;
 508
 509         // Kill the thread and clean up
 510         this->running = 0;
 511
 512         pthread_mutex_lock( &this->audio_mutex );
 513         pthread_cond_broadcast( &this->audio_cond );
 514         pthread_mutex_unlock( &this->audio_mutex );
 515
 516         pthread_join( this->thread, NULL );
 517         pthread_mutex_destroy( &this->audio_mutex );
 518         pthread_cond_destroy( &this->audio_cond );
 519
 520         // Now clean up the rest (the close = NULL is a bit nasty but needed for now)
 521         parent->close = NULL;
 522         mlt_consumer_close( parent );
 523
 524         // Finally clean up this
 525         free( this );
 526 }
 527