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 };
  57
  58 /** Forward references to static functions.
  59 */
  60
  61 static void consumer_close( mlt_consumer parent );
  62 static void *consumer_thread( void * );
  63 static int consumer_get_dimensions( int *width, int *height );
  64
  65 /** This is what will be called by the factory - anything can be passed in
  66         via the argument, but keep it simple.
  67 */
  68
  69 mlt_consumer consumer_sdl_init( char *arg )
  70 {
  71         // Create the consumer object
  72         consumer_sdl this = calloc( sizeof( struct consumer_sdl_s ), 1 );
  73
  74         // If no malloc'd and consumer init ok
  75         if ( this != NULL && mlt_consumer_init( &this->parent, this ) == 0 )
  76         {
  77                 // Get the parent consumer object
  78                 mlt_consumer parent = &this->parent;
  79
  80                 // We have stuff to clean up, so override the close method
  81                 parent->close = consumer_close;
  82
  83                 // get a handle on properties
  84                 mlt_service service = mlt_consumer_service( parent );
  85                 this->properties = mlt_service_properties( service );
  86
  87                 // Set the default volume
  88                 mlt_properties_set_double( this->properties, "volume", 1.0 );
  89
  90                 // This is the initialisation of the consumer
  91                 this->running = 1;
  92                 pthread_mutex_init( &this->audio_mutex, NULL );
  93                 pthread_cond_init( &this->audio_cond, NULL);
  94
  95                 // process actual param
  96                 if ( arg == NULL || !strcmp( arg, "PAL" ) )
  97                 {
  98                         this->width = 720;
  99                         this->height = 576;
 100                 }
 101                 else if ( !strcmp( arg, "NTSC" ) )
 102                 {
 103                         this->width = 720;
 104                         this->height = 480;
 105                 }
 106                 else if ( sscanf( arg, "%dx%d", &this->width, &this->height ) != 2 )
 107                 {
 108                         this->width = 720;
 109                         this->height = 576;
 110                 }
 111
 112                 // Default window size and aspect ratio
 113                 this->aspect_ratio = 4.0 / 3.0;
 114                 this->window_width = (int)( (float)this->height * this->aspect_ratio ) + 1;
 115                 this->window_height = this->height;
 116
 117                 // Create the the thread
 118                 pthread_create( &this->thread, NULL, consumer_thread, this );
 119
 120                 // Return the consumer produced
 121                 return parent;
 122         }
 123
 124         // malloc or consumer init failed
 125         free( this );
 126
 127         // Indicate failure
 128         return NULL;
 129 }
 130
 131 static int sdl_lock_display( )
 132 {
 133         SDL_Surface *screen = SDL_GetVideoSurface( );
 134         return screen != NULL && ( !SDL_MUSTLOCK( screen ) || SDL_LockSurface( screen ) >= 0 );
 135 }
 136
 137 static void sdl_unlock_display( )
 138 {
 139         SDL_Surface *screen = SDL_GetVideoSurface( );
 140         if ( screen != NULL && SDL_MUSTLOCK( screen ) )
 141                 SDL_UnlockSurface( screen );
 142 }
 143
 144 void sdl_fill_audio( void *udata, uint8_t *stream, int len )
 145 {
 146         consumer_sdl this = udata;
 147
 148         // Get the volume
 149         float volume = mlt_properties_get_double( this->properties, "volume" );
 150
 151         pthread_mutex_lock( &this->audio_mutex );
 152
 153         // Block until audio received
 154         while ( this->running && len > this->audio_avail )
 155                 pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 156
 157         if ( this->audio_avail >= len )
 158         {
 159                 // Place in the audio buffer
 160                 SDL_MixAudio( stream, this->audio_buffer, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 161
 162                 // Remove len from the audio available
 163                 this->audio_avail -= len;
 164
 165                 // Remove the samples
 166                 memmove( this->audio_buffer, this->audio_buffer + len, this->audio_avail );
 167         }
 168         else
 169         {
 170                 // Just to be safe, wipe the stream first
 171                 memset( stream, 0, len );
 172
 173                 // Copy what we have into the stream
 174                 memcpy( stream, this->audio_buffer, this->audio_avail );
 175
 176                 // Mix the audio
 177                 SDL_MixAudio( stream, stream, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 178
 179                 // No audio left
 180                 this->audio_avail = 0;
 181         }
 182
 183         // We're definitely playing now
 184         this->playing = 1;
 185
 186         pthread_cond_broadcast( &this->audio_cond );
 187         pthread_mutex_unlock( &this->audio_mutex );
 188 }
 189
 190 static int consumer_play_audio( consumer_sdl this, mlt_frame frame, int init_audio )
 191 {
 192         mlt_audio_format afmt = mlt_audio_pcm;
 193         int channels;
 194         int samples;
 195         int frequency;
 196         int16_t *pcm;
 197         int bytes;
 198
 199         mlt_frame_get_audio( frame, &pcm, &afmt, &frequency, &channels, &samples );
 200
 201         if ( init_audio == 1 )
 202         {
 203                 SDL_AudioSpec request;
 204                 SDL_AudioSpec got;
 205
 206                 // specify audio format
 207                 memset( &request, 0, sizeof( SDL_AudioSpec ) );
 208                 this->playing = 0;
 209                 request.freq = frequency;
 210                 request.format = AUDIO_S16;
 211                 request.channels = channels;
 212                 request.samples = 1024;
 213                 request.callback = sdl_fill_audio;
 214                 request.userdata = (void *)this;
 215                 if ( SDL_OpenAudio( &request, &got ) != 0 )
 216                 {
 217                         fprintf( stderr, "SDL failed to open audio: %s\n", SDL_GetError() );
 218                         init_audio = 2;
 219                 }
 220                 else
 221                 {
 222                         if ( got.size != 0 )
 223                         {
 224                                 SDL_PauseAudio( 0 );
 225                                 init_audio = 0;
 226                         }
 227                 }
 228         }
 229
 230         if ( init_audio == 0 )
 231         {
 232                 bytes = ( samples * channels * 2 );
 233                 pthread_mutex_lock( &this->audio_mutex );
 234                 while ( bytes > ( sizeof( this->audio_buffer) - this->audio_avail ) )
 235                         pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 236                 mlt_properties properties = mlt_frame_properties( frame );
 237                 if ( mlt_properties_get_double( properties, "speed" ) == 1 )
 238                         memcpy( &this->audio_buffer[ this->audio_avail ], pcm, bytes );
 239                 else
 240                         memset( &this->audio_buffer[ this->audio_avail ], 0, bytes );
 241                 this->audio_avail += bytes;
 242                 pthread_cond_broadcast( &this->audio_cond );
 243                 pthread_mutex_unlock( &this->audio_mutex );
 244         }
 245         else
 246         {
 247                 this->playing = 1;
 248         }
 249
 250         return init_audio;
 251 }
 252
 253 /** Threaded wrapper for pipe.
 254 */
 255
 256 static void *consumer_thread( void *arg )
 257 {
 258         // Identify the arg
 259         consumer_sdl this = arg;
 260
 261         // Get the consumer
 262         mlt_consumer consumer = &this->parent;
 263
 264         // Get the service assoicated to the consumer
 265         mlt_service service = mlt_consumer_service( consumer );
 266
 267         // Get the properties of this consumer
 268         mlt_properties properties = this->properties;
 269
 270         // Define a frame pointer
 271         mlt_frame frame;
 272
 273         // internal intialization
 274         int sdl_flags = SDL_HWSURFACE | SDL_DOUBLEBUF | SDL_HWACCEL | SDL_RESIZABLE;
 275         SDL_Surface *sdl_screen = NULL;
 276         SDL_Overlay *sdl_overlay = NULL;
 277         uint8_t *buffer = NULL;
 278         int init_audio = 1;
 279
 280         if ( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_NOPARACHUTE ) < 0 )
 281         {
 282                 fprintf( stderr, "Failed to initialize SDL: %s\n", SDL_GetError() );
 283                 return NULL;
 284         }
 285
 286         // Loop until told not to
 287         while( this->running )
 288         {
 289                 // Get a frame from the service (should never return anything other than 0)
 290                 if ( mlt_service_get_frame( service, &frame, 0 ) == 0 )
 291                 {
 292                         init_audio = consumer_play_audio( this, frame, init_audio );
 293
 294                         mlt_image_format vfmt = mlt_image_yuv422;
 295                         int width = this->width, height = this->height;
 296                         uint8_t *image;
 297                         int changed = 0;
 298
 299                         if ( this->count == this->size )
 300                         {
 301                                 this->size += 25;
 302                                 this->queue = realloc( this->queue, sizeof( mlt_frame ) * this->size );
 303                         }
 304                         this->queue[ this->count ++ ] = frame;
 305
 306                         if ( this->playing )
 307                         {
 308                                 // We're working on the oldest frame now
 309                                 frame = this->queue[ 0 ];
 310
 311                                 // Shunt the frames in the queue down
 312                                 int i = 0;
 313                                 for ( i = 1; i < this->count; i ++ )
 314                                         this->queue[ i - 1 ] = this->queue[ i ];
 315                                 this->count --;
 316
 317                                 // Get the image, width and height
 318                                 mlt_frame_get_image( frame, &image, &vfmt, &width, &height, 0 );
 319
 320                                 if ( sdl_screen != NULL )
 321                                 {
 322                                         SDL_Event event;
 323
 324                                         changed = consumer_get_dimensions( &this->window_width, &this->window_height );
 325
 326                                         while ( SDL_PollEvent( &event ) )
 327                                         {
 328                                                 switch( event.type )
 329                                                 {
 330                                                         case SDL_VIDEORESIZE:
 331                                                                 this->window_width = event.resize.w;
 332                                                                 this->window_height = event.resize.h;
 333                                                                 changed = 1;
 334                                                                 break;
 335                                                         case SDL_KEYDOWN:
 336                                                                 {
 337                                                                         mlt_producer producer = mlt_properties_get_data( properties, "transport_producer", NULL );
 338                                                                         void (*callback)( mlt_producer, char * ) = mlt_properties_get_data( properties, "transport_callback", NULL );
 339                                                                         if ( callback != NULL && producer != NULL )
 340                                                                                 callback( producer, SDL_GetKeyName(event.key.keysym.sym) );
 341                                                                 }
 342                                                                 break;
 343                                                 }
 344                                         }
 345
 346                                 }
 347
 348                                 if ( width != this->width || height != this->height )
 349                                 {
 350                                         this->width = width;
 351                                         this->height = height;
 352                                         changed = 1;
 353                                 }
 354
 355                                 if ( sdl_screen == NULL || changed )
 356                                 {
 357                                         double aspect_ratio = mlt_frame_get_aspect_ratio( frame );
 358
 359                                         if ( mlt_properties_get_double( properties, "aspect_ratio" ) )
 360                                                 aspect_ratio = mlt_properties_get_double( properties, "aspect_ratio" );
 361
 362                                         int full_width = height * aspect_ratio + 1;
 363                                         int full_height = height;
 364                                         float scale_width = (float)full_width / (float)this->window_width;
 365                                         float scale_height = (float)full_height / (float)this->window_height;
 366                                         float display_aspect_ratio = (float)this->window_width / (float)this->window_height;
 367
 368                                         SDL_Rect rect;
 369
 370                                         if ( aspect_ratio == 1 )
 371                                         {
 372                                                 rect.w = this->window_width;
 373                                                 rect.h = this->window_height;
 374                                         }
 375                                         else if ( this->window_width < this->window_height * aspect_ratio )
 376                                         {
 377                                                 rect.w = this->window_width;
 378                                                 rect.h = this->window_width / aspect_ratio;
 379                                         }
 380                                         else
 381                                         {
 382                                                 rect.w = this->window_height * aspect_ratio;
 383                                                 rect.h = this->window_height;
 384                                         }
 385
 386                                         rect.x = ( this->window_width - rect.w ) / 2;
 387                                         rect.y = ( this->window_height - rect.h ) / 2;
 388
 389                                         // Force an overlay recreation
 390                                         if ( sdl_overlay != NULL )
 391                                                 SDL_FreeYUVOverlay( sdl_overlay );
 392
 393                                         // open SDL window with video overlay, if possible
 394                                         sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 0, sdl_flags );
 395
 396                                         if ( sdl_screen != NULL )
 397                                         {
 398                                                 SDL_SetClipRect( sdl_screen, &rect );
 399
 400                                                 sdl_lock_display();
 401                                                 sdl_overlay = SDL_CreateYUVOverlay( this->width - (this->width % 4), this->height- (this->height % 2 ), SDL_YUY2_OVERLAY, sdl_screen );
 402                                                 sdl_unlock_display();
 403                                         }
 404                                 }
 405
 406                                 if ( sdl_screen != NULL && sdl_overlay != NULL )
 407                                 {
 408                                         buffer = sdl_overlay->pixels[ 0 ];
 409                                         if ( SDL_LockYUVOverlay( sdl_overlay ) >= 0 )
 410                                         {
 411                                                 mlt_resize_yuv422( buffer, this->width - (this->width % 4 ), this->height- (this->height % 2 ), image, width, height );
 412                                                 SDL_UnlockYUVOverlay( sdl_overlay );
 413                                                 SDL_DisplayYUVOverlay( sdl_overlay, &sdl_screen->clip_rect );
 414                                         }
 415                                 }
 416                         }
 417                         else
 418                         {
 419                                 frame = NULL;
 420                         }
 421
 422                         // Close the frame
 423                         if ( frame != NULL )
 424                                 mlt_frame_close( frame );
 425
 426                         if ( this->count )
 427                                 mlt_frame_get_image( this->queue[ this->count - 1 ], &image, &vfmt, &width, &height, 0 );
 428                 }
 429                 else
 430                 {
 431                         break;
 432                 }
 433         } // while
 434
 435         // internal cleanup
 436         if ( init_audio == 0 )
 437                 SDL_AudioQuit( );
 438         if ( sdl_overlay != NULL )
 439                 SDL_FreeYUVOverlay( sdl_overlay );
 440         SDL_Quit( );
 441
 442         return NULL;
 443 }
 444
 445 static int consumer_get_dimensions( int *width, int *height )
 446 {
 447         int changed = 0;
 448
 449         // SDL windows manager structure
 450         SDL_SysWMinfo wm;
 451
 452         // Specify the SDL Version
 453         SDL_VERSION( &wm.version );
 454
 455         // Get the wm structure
 456         if ( SDL_GetWMInfo( &wm ) == 1 )
 457         {
 458                 // Check that we have the X11 wm
 459                 if ( wm.subsystem == SDL_SYSWM_X11 )
 460                 {
 461                         // Get the SDL window
 462                         Window window = wm.info.x11.window;
 463
 464                         // Get the display session
 465                         Display *display = wm.info.x11.display;
 466
 467                         // Get the window attributes
 468                         XWindowAttributes attr;
 469                         XGetWindowAttributes( display, window, &attr );
 470
 471                         // Determine whether window has changed
 472                         changed = *width != attr.width || *height != attr.height;
 473
 474                         // Return width and height
 475                         *width = attr.width;
 476                         *height = attr.height;
 477                 }
 478         }
 479
 480         return changed;
 481 }
 482
 483 /** Callback to allow override of the close method.
 484 */
 485
 486 static void consumer_close( mlt_consumer parent )
 487 {
 488         // Get the actual object
 489         consumer_sdl this = parent->child;
 490
 491         // Kill the thread and clean up
 492         this->running = 0;
 493
 494         pthread_mutex_lock( &this->audio_mutex );
 495         pthread_cond_broadcast( &this->audio_cond );
 496         pthread_mutex_unlock( &this->audio_mutex );
 497
 498         pthread_join( this->thread, NULL );
 499         pthread_mutex_destroy( &this->audio_mutex );
 500         pthread_cond_destroy( &this->audio_cond );
 501
 502         // Now clean up the rest (the close = NULL is a bit nasty but needed for now)
 503         parent->close = NULL;
 504         mlt_consumer_close( parent );
 505
 506         // Finally clean up this
 507         free( this );
 508 }
 509