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
 203         // Set the preferred params of the test card signal
 204         int channels = 2;
 205         int frequency = 48000;
 206         static int counter = 0;
 207         int samples = mlt_sample_calculator( ( this->height < 576 ? 29.97 : 25 ), frequency, counter++ );
 208
 209         int16_t *pcm;
 210         int bytes;
 211
 212         mlt_frame_get_audio( frame, &pcm, &afmt, &frequency, &channels, &samples );
 213
 214         if ( mlt_properties_get_int( properties, "audio_off" ) )
 215         {
 216                 this->playing = 1;
 217                 return init_audio;
 218         }
 219
 220         if ( init_audio == 1 )
 221         {
 222                 SDL_AudioSpec request;
 223                 SDL_AudioSpec got;
 224
 225                 // specify audio format
 226                 memset( &request, 0, sizeof( SDL_AudioSpec ) );
 227                 this->playing = 0;
 228                 request.freq = frequency;
 229                 request.format = AUDIO_S16;
 230                 request.channels = channels;
 231                 request.samples = 1024;
 232                 request.callback = sdl_fill_audio;
 233                 request.userdata = (void *)this;
 234                 if ( SDL_OpenAudio( &request, &got ) != 0 )
 235                 {
 236                         fprintf( stderr, "SDL failed to open audio: %s\n", SDL_GetError() );
 237                         init_audio = 2;
 238                 }
 239                 else if ( got.size != 0 )
 240                 {
 241                         SDL_PauseAudio( 0 );
 242                         init_audio = 0;
 243                 }
 244         }
 245
 246         if ( init_audio == 0 )
 247         {
 248                 bytes = ( samples * channels * 2 );
 249                 pthread_mutex_lock( &this->audio_mutex );
 250                 while ( bytes > ( sizeof( this->audio_buffer) - this->audio_avail ) )
 251                         pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 252                 mlt_properties properties = mlt_frame_properties( frame );
 253                 if ( mlt_properties_get_double( properties, "speed" ) == 1 )
 254                         memcpy( &this->audio_buffer[ this->audio_avail ], pcm, bytes );
 255                 else
 256                         memset( &this->audio_buffer[ this->audio_avail ], 0, bytes );
 257                 this->audio_avail += bytes;
 258                 pthread_cond_broadcast( &this->audio_cond );
 259                 pthread_mutex_unlock( &this->audio_mutex );
 260         }
 261         else
 262         {
 263                 this->playing = 1;
 264         }
 265
 266         return init_audio;
 267 }
 268
 269 static int consumer_play_video( consumer_sdl this, mlt_frame frame )
 270 {
 271         // Get the properties of this consumer
 272         mlt_properties properties = this->properties;
 273
 274         mlt_image_format vfmt = mlt_image_yuv422;
 275         int width = this->width, height = this->height;
 276         uint8_t *image;
 277         int changed = 0;
 278
 279         if ( mlt_properties_get_int( properties, "video_off" ) )
 280         {
 281                 mlt_frame_close( frame );
 282                 return 0;
 283         }
 284
 285         if ( this->count == this->size )
 286         {
 287                 this->size += 25;
 288                 this->queue = realloc( this->queue, sizeof( mlt_frame ) * this->size );
 289         }
 290         this->queue[ this->count ++ ] = frame;
 291
 292         if ( this->playing )
 293         {
 294                 // We're working on the oldest frame now
 295                 frame = this->queue[ 0 ];
 296
 297                 // Shunt the frames in the queue down
 298                 int i = 0;
 299                 for ( i = 1; i < this->count; i ++ )
 300                         this->queue[ i - 1 ] = this->queue[ i ];
 301                 this->count --;
 302
 303                 // Get the image, width and height
 304                 mlt_frame_get_image( frame, &image, &vfmt, &width, &height, 0 );
 305
 306                 if ( this->sdl_screen != NULL )
 307                 {
 308                         SDL_Event event;
 309
 310                         changed = consumer_get_dimensions( &this->window_width, &this->window_height );
 311
 312                         while ( SDL_PollEvent( &event ) )
 313                         {
 314                                 switch( event.type )
 315                                 {
 316                                         case SDL_VIDEORESIZE:
 317                                                 this->window_width = event.resize.w;
 318                                                 this->window_height = event.resize.h;
 319                                                 changed = 1;
 320                                                 break;
 321                                         case SDL_KEYDOWN:
 322                                                 {
 323                                                         mlt_producer producer = mlt_properties_get_data( properties, "transport_producer", NULL );
 324                                                         void (*callback)( mlt_producer, char * ) = mlt_properties_get_data( properties, "transport_callback", NULL );
 325                                                         if ( callback != NULL && producer != NULL )
 326                                                                 callback( producer, SDL_GetKeyName(event.key.keysym.sym) );
 327                                                 }
 328                                                 break;
 329                                 }
 330                         }
 331
 332                 }
 333
 334                 if ( width != this->width || height != this->height )
 335                 {
 336                         this->width = width;
 337                         this->height = height;
 338                         changed = 1;
 339                 }
 340
 341                 if ( this->sdl_screen == NULL || changed )
 342                 {
 343                         double aspect_ratio = mlt_frame_get_aspect_ratio( frame );
 344                         float display_aspect_ratio = (float)width / (float)height;
 345                         SDL_Rect rect;
 346
 347                         if ( mlt_properties_get_double( properties, "aspect_ratio" ) )
 348                                 aspect_ratio = mlt_properties_get_double( properties, "aspect_ratio" );
 349
 350                         if ( aspect_ratio == 1 )
 351                         {
 352                                 rect.w = this->window_width;
 353                                 rect.h = this->window_height;
 354                         }
 355                         else if ( this->window_width < this->window_height * aspect_ratio )
 356                         {
 357                                 rect.w = this->window_width;
 358                                 rect.h = this->window_width / aspect_ratio;
 359                         }
 360                         else
 361                         {
 362                                 rect.w = this->window_height * aspect_ratio;
 363                                 rect.h = this->window_height;
 364                         }
 365
 366                         if ( mlt_properties_get_int( properties, "scale_overlay" ) )
 367                         {
 368                                 if ( ( float )rect.w * display_aspect_ratio < this->window_width )
 369                                         rect.w = ( int )( ( float )rect.w * display_aspect_ratio );
 370                                 else if ( ( float )rect.h * display_aspect_ratio < this->window_height )
 371                                         rect.h = ( int )( ( float )rect.h * display_aspect_ratio );
 372                         }
 373
 374                         rect.x = ( this->window_width - rect.w ) / 2;
 375                         rect.y = ( this->window_height - rect.h ) / 2;
 376
 377                         // Force an overlay recreation
 378                         if ( this->sdl_overlay != NULL )
 379                                 SDL_FreeYUVOverlay( this->sdl_overlay );
 380
 381                         // open SDL window with video overlay, if possible
 382                         this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 0, this->sdl_flags );
 383
 384                         if ( this->sdl_screen != NULL )
 385                         {
 386                                 SDL_SetClipRect( this->sdl_screen, &rect );
 387
 388                                 sdl_lock_display();
 389                                 this->sdl_overlay = SDL_CreateYUVOverlay( this->width - (this->width % 4), this->height- (this->height % 2 ), SDL_YUY2_OVERLAY, this->sdl_screen );
 390                                 sdl_unlock_display();
 391                         }
 392                 }
 393
 394                 if ( this->sdl_screen != NULL && this->sdl_overlay != NULL )
 395                 {
 396                         this->buffer = this->sdl_overlay->pixels[ 0 ];
 397                         if ( SDL_LockYUVOverlay( this->sdl_overlay ) >= 0 )
 398                         {
 399                                 mlt_resize_yuv422( this->buffer, this->width - (this->width % 4 ), this->height- (this->height % 2 ), image, width, height );
 400                                 SDL_UnlockYUVOverlay( this->sdl_overlay );
 401                                 SDL_DisplayYUVOverlay( this->sdl_overlay, &this->sdl_screen->clip_rect );
 402                         }
 403                 }
 404         }
 405         else
 406         {
 407                 frame = NULL;
 408         }
 409
 410         // Close the frame
 411         if ( frame != NULL )
 412                 mlt_frame_close( frame );
 413
 414         if ( this->count )
 415                 mlt_frame_get_image( this->queue[ this->count - 1 ], &image, &vfmt, &width, &height, 0 );
 416
 417         return 0;
 418 }
 419
 420 /** Threaded wrapper for pipe.
 421 */
 422
 423 static void *consumer_thread( void *arg )
 424 {
 425         // Identify the arg
 426         consumer_sdl this = arg;
 427
 428         // Get the consumer
 429         mlt_consumer consumer = &this->parent;
 430
 431         // Get the service assoicated to the consumer
 432         mlt_service service = mlt_consumer_service( consumer );
 433
 434         // Define a frame pointer
 435         mlt_frame frame;
 436
 437         // internal intialization
 438         int init_audio = 1;
 439
 440         if ( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_NOPARACHUTE ) < 0 )
 441         {
 442                 fprintf( stderr, "Failed to initialize SDL: %s\n", SDL_GetError() );
 443                 return NULL;
 444         }
 445
 446         // Loop until told not to
 447         while( this->running )
 448         {
 449                 // Get a frame from the service (should never return anything other than 0)
 450                 if ( mlt_service_get_frame( service, &frame, 0 ) == 0 )
 451                 {
 452                         init_audio = consumer_play_audio( this, frame, init_audio );
 453                         consumer_play_video( this, frame );
 454                 }
 455         }
 456
 457         // internal cleanup
 458         if ( init_audio == 0 )
 459                 SDL_AudioQuit( );
 460         if ( this->sdl_overlay != NULL )
 461                 SDL_FreeYUVOverlay( this->sdl_overlay );
 462         SDL_Quit( );
 463
 464         return NULL;
 465 }
 466
 467 static int consumer_get_dimensions( int *width, int *height )
 468 {
 469         int changed = 0;
 470
 471         // SDL windows manager structure
 472         SDL_SysWMinfo wm;
 473
 474         // Specify the SDL Version
 475         SDL_VERSION( &wm.version );
 476
 477         // Get the wm structure
 478         if ( SDL_GetWMInfo( &wm ) == 1 )
 479         {
 480                 // Check that we have the X11 wm
 481                 if ( wm.subsystem == SDL_SYSWM_X11 )
 482                 {
 483                         // Get the SDL window
 484                         Window window = wm.info.x11.window;
 485
 486                         // Get the display session
 487                         Display *display = wm.info.x11.display;
 488
 489                         // Get the window attributes
 490                         XWindowAttributes attr;
 491                         XGetWindowAttributes( display, window, &attr );
 492
 493                         // Determine whether window has changed
 494                         changed = *width != attr.width || *height != attr.height;
 495
 496                         // Return width and height
 497                         *width = attr.width;
 498                         *height = attr.height;
 499                 }
 500         }
 501
 502         return changed;
 503 }
 504
 505 /** Callback to allow override of the close method.
 506 */
 507
 508 static void consumer_close( mlt_consumer parent )
 509 {
 510         // Get the actual object
 511         consumer_sdl this = parent->child;
 512
 513         // Kill the thread and clean up
 514         this->running = 0;
 515
 516         pthread_mutex_lock( &this->audio_mutex );
 517         pthread_cond_broadcast( &this->audio_cond );
 518         pthread_mutex_unlock( &this->audio_mutex );
 519
 520         pthread_join( this->thread, NULL );
 521         pthread_mutex_destroy( &this->audio_mutex );
 522         pthread_cond_destroy( &this->audio_cond );
 523
 524         // Now clean up the rest (the close = NULL is a bit nasty but needed for now)
 525         parent->close = NULL;
 526         mlt_consumer_close( parent );
 527
 528         // Finally clean up this
 529         free( this );
 530 }
 531