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                 // Default fps
 100                 mlt_properties_set_double( this->properties, "fps", 25 );
 101
 102                 // process actual param
 103                 if ( arg == NULL || !strcmp( arg, "PAL" ) )
 104                 {
 105                         this->width = 720;
 106                         this->height = 576;
 107                 }
 108                 else if ( !strcmp( arg, "NTSC" ) )
 109                 {
 110                         this->width = 720;
 111                         this->height = 480;
 112                         mlt_properties_set_double( this->properties, "fps", 29.97 );
 113                 }
 114                 else if ( sscanf( arg, "%dx%d", &this->width, &this->height ) != 2 )
 115                 {
 116                         this->width = 720;
 117                         this->height = 576;
 118                 }
 119
 120                 // Default window size and aspect ratio
 121                 this->aspect_ratio = 4.0 / 3.0;
 122                 this->window_width = (int)( (float)this->height * this->aspect_ratio ) + 1;
 123                 this->window_height = this->height;
 124
 125                 // Set the sdl flags
 126                 this->sdl_flags = SDL_HWSURFACE | SDL_DOUBLEBUF | SDL_HWACCEL | SDL_RESIZABLE;
 127
 128                 // Create the the thread
 129                 pthread_create( &this->thread, NULL, consumer_thread, this );
 130
 131                 // Return the consumer produced
 132                 return parent;
 133         }
 134
 135         // malloc or consumer init failed
 136         free( this );
 137
 138         // Indicate failure
 139         return NULL;
 140 }
 141
 142 static int sdl_lock_display( )
 143 {
 144         SDL_Surface *screen = SDL_GetVideoSurface( );
 145         return screen != NULL && ( !SDL_MUSTLOCK( screen ) || SDL_LockSurface( screen ) >= 0 );
 146 }
 147
 148 static void sdl_unlock_display( )
 149 {
 150         SDL_Surface *screen = SDL_GetVideoSurface( );
 151         if ( screen != NULL && SDL_MUSTLOCK( screen ) )
 152                 SDL_UnlockSurface( screen );
 153 }
 154
 155 static void sdl_fill_audio( void *udata, uint8_t *stream, int len )
 156 {
 157         consumer_sdl this = udata;
 158
 159         // Get the volume
 160         float volume = mlt_properties_get_double( this->properties, "volume" );
 161
 162         pthread_mutex_lock( &this->audio_mutex );
 163
 164         // Block until audio received
 165         while ( this->running && len > this->audio_avail )
 166                 pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 167
 168         if ( this->audio_avail >= len )
 169         {
 170                 // Place in the audio buffer
 171                 SDL_MixAudio( stream, this->audio_buffer, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 172
 173                 // Remove len from the audio available
 174                 this->audio_avail -= len;
 175
 176                 // Remove the samples
 177                 memmove( this->audio_buffer, this->audio_buffer + len, this->audio_avail );
 178         }
 179         else
 180         {
 181                 // Just to be safe, wipe the stream first
 182                 memset( stream, 0, len );
 183
 184                 // Copy what we have into the stream
 185                 memcpy( stream, this->audio_buffer, this->audio_avail );
 186
 187                 // Mix the audio
 188                 SDL_MixAudio( stream, stream, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 189
 190                 // No audio left
 191                 this->audio_avail = 0;
 192         }
 193
 194         // We're definitely playing now
 195         this->playing = 1;
 196
 197         pthread_cond_broadcast( &this->audio_cond );
 198         pthread_mutex_unlock( &this->audio_mutex );
 199 }
 200
 201 static int consumer_play_audio( consumer_sdl this, mlt_frame frame, int init_audio )
 202 {
 203         // Get the properties of this consumer
 204         mlt_properties properties = this->properties;
 205         mlt_audio_format afmt = mlt_audio_pcm;
 206
 207         // Set the preferred params of the test card signal
 208         int channels = 2;
 209         int frequency = 48000;
 210         static int counter = 0;
 211         int samples = mlt_sample_calculator( mlt_properties_get_double( this->properties, "fps" ), frequency, counter++ );
 212
 213         int16_t *pcm;
 214         int bytes;
 215
 216         mlt_frame_get_audio( frame, &pcm, &afmt, &frequency, &channels, &samples );
 217
 218         if ( mlt_properties_get_int( properties, "audio_off" ) )
 219         {
 220                 this->playing = 1;
 221                 return init_audio;
 222         }
 223
 224         if ( init_audio == 1 )
 225         {
 226                 SDL_AudioSpec request;
 227                 SDL_AudioSpec got;
 228
 229                 SDL_EnableKeyRepeat( SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL );
 230
 231                 // specify audio format
 232                 memset( &request, 0, sizeof( SDL_AudioSpec ) );
 233                 this->playing = 0;
 234                 request.freq = frequency;
 235                 request.format = AUDIO_S16;
 236                 request.channels = channels;
 237                 request.samples = 1024;
 238                 request.callback = sdl_fill_audio;
 239                 request.userdata = (void *)this;
 240                 if ( SDL_OpenAudio( &request, &got ) != 0 )
 241                 {
 242                         fprintf( stderr, "SDL failed to open audio: %s\n", SDL_GetError() );
 243                         init_audio = 2;
 244                 }
 245                 else if ( got.size != 0 )
 246                 {
 247                         SDL_PauseAudio( 0 );
 248                         init_audio = 0;
 249                 }
 250         }
 251
 252         if ( init_audio == 0 )
 253         {
 254                 bytes = ( samples * channels * 2 );
 255                 pthread_mutex_lock( &this->audio_mutex );
 256                 while ( bytes > ( sizeof( this->audio_buffer) - this->audio_avail ) )
 257                         pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 258                 mlt_properties properties = mlt_frame_properties( frame );
 259                 if ( mlt_properties_get_double( properties, "speed" ) == 1 )
 260                         memcpy( &this->audio_buffer[ this->audio_avail ], pcm, bytes );
 261                 else
 262                         memset( &this->audio_buffer[ this->audio_avail ], 0, bytes );
 263                 this->audio_avail += bytes;
 264                 pthread_cond_broadcast( &this->audio_cond );
 265                 pthread_mutex_unlock( &this->audio_mutex );
 266         }
 267         else
 268         {
 269                 this->playing = 1;
 270         }
 271
 272         return init_audio;
 273 }
 274
 275 static int consumer_play_video( consumer_sdl this, mlt_frame frame )
 276 {
 277         // Get the properties of this consumer
 278         mlt_properties properties = this->properties;
 279
 280         mlt_image_format vfmt = mlt_image_yuv422;
 281         int width = this->width, height = this->height;
 282         uint8_t *image;
 283         int changed = 0;
 284
 285         if ( mlt_properties_get_int( properties, "video_off" ) )
 286         {
 287                 mlt_frame_close( frame );
 288                 return 0;
 289         }
 290
 291         if ( this->count == this->size )
 292         {
 293                 this->size += 25;
 294                 this->queue = realloc( this->queue, sizeof( mlt_frame ) * this->size );
 295         }
 296         this->queue[ this->count ++ ] = frame;
 297
 298         if ( this->playing )
 299         {
 300                 // We're working on the oldest frame now
 301                 frame = this->queue[ 0 ];
 302
 303                 // Shunt the frames in the queue down
 304                 int i = 0;
 305                 for ( i = 1; i < this->count; i ++ )
 306                         this->queue[ i - 1 ] = this->queue[ i ];
 307                 this->count --;
 308
 309                 // Get the image, width and height
 310                 mlt_frame_get_image( frame, &image, &vfmt, &width, &height, 0 );
 311
 312                 if ( this->sdl_screen != NULL )
 313                 {
 314                         SDL_Event event;
 315
 316                         changed = consumer_get_dimensions( &this->window_width, &this->window_height );
 317
 318                         while ( SDL_PollEvent( &event ) )
 319                         {
 320                                 switch( event.type )
 321                                 {
 322                                         case SDL_VIDEORESIZE:
 323                                                 this->window_width = event.resize.w;
 324                                                 this->window_height = event.resize.h;
 325                                                 changed = 1;
 326                                                 break;
 327                                         case SDL_KEYDOWN:
 328                                                 {
 329                                                         mlt_producer producer = mlt_properties_get_data( properties, "transport_producer", NULL );
 330                                                         void (*callback)( mlt_producer, char * ) = mlt_properties_get_data( properties, "transport_callback", NULL );
 331                                                         if ( callback != NULL && producer != NULL && strcmp( SDL_GetKeyName(event.key.keysym.sym), "space" ) )
 332                                                                 callback( producer, SDL_GetKeyName(event.key.keysym.sym) );
 333                                                         else if ( callback != NULL && producer != NULL && !strcmp( SDL_GetKeyName(event.key.keysym.sym), "space" ) )
 334                                                                 callback( producer, " " );
 335                                                 }
 336                                                 break;
 337                                 }
 338                         }
 339
 340                 }
 341
 342                 if ( width != this->width || height != this->height )
 343                 {
 344                         this->width = width;
 345                         this->height = height;
 346                         changed = 1;
 347                 }
 348
 349                 if ( this->sdl_screen == NULL || changed )
 350                 {
 351                         double aspect_ratio = mlt_frame_get_aspect_ratio( frame );
 352                         float display_aspect_ratio = (float)width / (float)height;
 353                         SDL_Rect rect;
 354
 355                         if ( mlt_properties_get_double( properties, "aspect_ratio" ) )
 356                                 aspect_ratio = mlt_properties_get_double( properties, "aspect_ratio" );
 357
 358                         if ( aspect_ratio == 1 )
 359                         {
 360                                 rect.w = this->window_width;
 361                                 rect.h = this->window_height;
 362                         }
 363                         else if ( this->window_width < this->window_height * aspect_ratio )
 364                         {
 365                                 rect.w = this->window_width;
 366                                 rect.h = this->window_width / aspect_ratio;
 367                         }
 368                         else
 369                         {
 370                                 rect.w = this->window_height * aspect_ratio;
 371                                 rect.h = this->window_height;
 372                         }
 373
 374                         if ( mlt_properties_get_int( properties, "scale_overlay" ) )
 375                         {
 376                                 if ( ( float )rect.w * display_aspect_ratio < this->window_width )
 377                                         rect.w = ( int )( ( float )rect.w * display_aspect_ratio );
 378                                 else if ( ( float )rect.h * display_aspect_ratio < this->window_height )
 379                                         rect.h = ( int )( ( float )rect.h * display_aspect_ratio );
 380                         }
 381
 382                         rect.x = ( this->window_width - rect.w ) / 2;
 383                         rect.y = ( this->window_height - rect.h ) / 2;
 384
 385                         // Force an overlay recreation
 386                         if ( this->sdl_overlay != NULL )
 387                                 SDL_FreeYUVOverlay( this->sdl_overlay );
 388
 389                         // open SDL window with video overlay, if possible
 390                         this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 0, this->sdl_flags );
 391
 392                         if ( this->sdl_screen != NULL )
 393                         {
 394                                 SDL_SetClipRect( this->sdl_screen, &rect );
 395
 396                                 sdl_lock_display();
 397                                 this->sdl_overlay = SDL_CreateYUVOverlay( this->width - (this->width % 4), this->height- (this->height % 2 ), SDL_YUY2_OVERLAY, this->sdl_screen );
 398                                 sdl_unlock_display();
 399                         }
 400                 }
 401
 402                 if ( this->sdl_screen != NULL && this->sdl_overlay != NULL )
 403                 {
 404                         this->buffer = this->sdl_overlay->pixels[ 0 ];
 405                         if ( SDL_LockYUVOverlay( this->sdl_overlay ) >= 0 )
 406                         {
 407                                 mlt_resize_yuv422( this->buffer, this->width - (this->width % 4 ), this->height- (this->height % 2 ), image, width, height );
 408                                 SDL_UnlockYUVOverlay( this->sdl_overlay );
 409                                 SDL_DisplayYUVOverlay( this->sdl_overlay, &this->sdl_screen->clip_rect );
 410                         }
 411                 }
 412         }
 413         else
 414         {
 415                 frame = NULL;
 416         }
 417
 418         // Close the frame
 419         if ( frame != NULL )
 420                 mlt_frame_close( frame );
 421
 422         if ( this->count )
 423                 mlt_frame_get_image( this->queue[ this->count - 1 ], &image, &vfmt, &width, &height, 0 );
 424
 425         return 0;
 426 }
 427
 428 /** Threaded wrapper for pipe.
 429 */
 430
 431 static void *consumer_thread( void *arg )
 432 {
 433         // Identify the arg
 434         consumer_sdl this = arg;
 435
 436         // Get the consumer
 437         mlt_consumer consumer = &this->parent;
 438
 439         // Get the service assoicated to the consumer
 440         mlt_service service = mlt_consumer_service( consumer );
 441
 442         // Define a frame pointer
 443         mlt_frame frame;
 444
 445         // internal intialization
 446         int init_audio = 1;
 447
 448         if ( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_NOPARACHUTE ) < 0 )
 449         {
 450                 fprintf( stderr, "Failed to initialize SDL: %s\n", SDL_GetError() );
 451                 return NULL;
 452         }
 453
 454         // Loop until told not to
 455         while( this->running )
 456         {
 457                 // Get a frame from the service (should never return anything other than 0)
 458                 if ( mlt_service_get_frame( service, &frame, 0 ) == 0 )
 459                 {
 460                         init_audio = consumer_play_audio( this, frame, init_audio );
 461                         consumer_play_video( this, frame );
 462                 }
 463         }
 464
 465         // internal cleanup
 466         if ( init_audio == 0 )
 467                 SDL_AudioQuit( );
 468         if ( this->sdl_overlay != NULL )
 469                 SDL_FreeYUVOverlay( this->sdl_overlay );
 470         SDL_Quit( );
 471
 472         return NULL;
 473 }
 474
 475 static int consumer_get_dimensions( int *width, int *height )
 476 {
 477         int changed = 0;
 478
 479         // SDL windows manager structure
 480         SDL_SysWMinfo wm;
 481
 482         // Specify the SDL Version
 483         SDL_VERSION( &wm.version );
 484
 485         // Get the wm structure
 486         if ( SDL_GetWMInfo( &wm ) == 1 )
 487         {
 488                 // Check that we have the X11 wm
 489                 if ( wm.subsystem == SDL_SYSWM_X11 )
 490                 {
 491                         // Get the SDL window
 492                         Window window = wm.info.x11.window;
 493
 494                         // Get the display session
 495                         Display *display = wm.info.x11.display;
 496
 497                         // Get the window attributes
 498                         XWindowAttributes attr;
 499                         XGetWindowAttributes( display, window, &attr );
 500
 501                         // Determine whether window has changed
 502                         changed = *width != attr.width || *height != attr.height;
 503
 504                         // Return width and height
 505                         *width = attr.width;
 506                         *height = attr.height;
 507                 }
 508         }
 509
 510         return changed;
 511 }
 512
 513 /** Callback to allow override of the close method.
 514 */
 515
 516 static void consumer_close( mlt_consumer parent )
 517 {
 518         // Get the actual object
 519         consumer_sdl this = parent->child;
 520
 521         // Kill the thread and clean up
 522         this->running = 0;
 523
 524         pthread_mutex_lock( &this->audio_mutex );
 525         pthread_cond_broadcast( &this->audio_cond );
 526         pthread_mutex_unlock( &this->audio_mutex );
 527
 528         pthread_join( this->thread, NULL );
 529         pthread_mutex_destroy( &this->audio_mutex );
 530         pthread_cond_destroy( &this->audio_cond );
 531
 532         // Now clean up the rest
 533         mlt_consumer_close( parent );
 534
 535         // Finally clean up this
 536         free( this );
 537 }
 538