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 * 6 ];
  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         int width;
  50         int height;
  51 };
  52
  53 /** Forward references to static functions.
  54 */
  55
  56 static void consumer_close( mlt_consumer parent );
  57 static void *consumer_thread( void * );
  58 static int consumer_get_dimensions( int *width, int *height );
  59
  60 /** This is what will be called by the factory - anything can be passed in
  61         via the argument, but keep it simple.
  62 */
  63
  64 mlt_consumer consumer_sdl_init( char *arg )
  65 {
  66         // Create the consumer object
  67         consumer_sdl this = calloc( sizeof( struct consumer_sdl_s ), 1 );
  68
  69         // If no malloc'd and consumer init ok
  70         if ( this != NULL && mlt_consumer_init( &this->parent, this ) == 0 )
  71         {
  72                 // Get the parent consumer object
  73                 mlt_consumer parent = &this->parent;
  74
  75                 // We have stuff to clean up, so override the close method
  76                 parent->close = consumer_close;
  77
  78                 // get a handle on properties
  79                 mlt_service service = mlt_consumer_service( parent );
  80                 this->properties = mlt_service_properties( service );
  81
  82                 // Set the default volume
  83                 mlt_properties_set_double( this->properties, "volume", 1.0 );
  84
  85                 // This is the initialisation of the consumer
  86                 this->running = 1;
  87                 pthread_mutex_init( &this->audio_mutex, NULL );
  88                 pthread_cond_init( &this->audio_cond, NULL);
  89
  90                 // process actual param
  91                 if ( arg == NULL || !strcmp( arg, "PAL" ) )
  92                 {
  93                         this->width = 720;
  94                         this->height = 576;
  95                 }
  96                 else if ( !strcmp( arg, "NTSC" ) )
  97                 {
  98                         this->width = 720;
  99                         this->height = 480;
 100                 }
 101                 else if ( sscanf( arg, "%dx%d", &this->width, &this->height ) != 2 )
 102                 {
 103                         this->width = 720;
 104                         this->height = 576;
 105                 }
 106
 107
 108                 // Create the the thread
 109                 pthread_create( &this->thread, NULL, consumer_thread, this );
 110
 111                 // Return the consumer produced
 112                 return parent;
 113         }
 114
 115         // malloc or consumer init failed
 116         free( this );
 117
 118         // Indicate failure
 119         return NULL;
 120 }
 121
 122 static int sdl_lock_display( )
 123 {
 124         SDL_Surface *screen = SDL_GetVideoSurface( );
 125         return screen != NULL && ( !SDL_MUSTLOCK( screen ) || SDL_LockSurface( screen ) >= 0 );
 126 }
 127
 128 static void sdl_unlock_display( )
 129 {
 130         SDL_Surface *screen = SDL_GetVideoSurface( );
 131         if ( screen != NULL && SDL_MUSTLOCK( screen ) )
 132                 SDL_UnlockSurface( screen );
 133 }
 134
 135 void sdl_fill_audio( void *udata, uint8_t *stream, int len )
 136 {
 137         consumer_sdl this = udata;
 138
 139         // Get the volume
 140         float volume = mlt_properties_get_double( this->properties, "volume" );
 141
 142         pthread_mutex_lock( &this->audio_mutex );
 143
 144         // Experimental - block until audio received
 145         while ( this->running && len > this->audio_avail )
 146                 pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 147
 148         if ( this->audio_avail >= len )
 149         {
 150                 // Place in the audio buffer
 151                 SDL_MixAudio( stream, this->audio_buffer, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 152
 153                 // Remove len from the audio available
 154                 this->audio_avail -= len;
 155
 156                 // Remove the samples
 157                 memmove( this->audio_buffer, this->audio_buffer + len, this->audio_avail );
 158         }
 159         else
 160         {
 161                 // Just to be safe, wipe the stream first
 162                 memset( stream, 0, len );
 163
 164                 // Copy what we have into the stream
 165                 memcpy( stream, this->audio_buffer, this->audio_avail );
 166
 167                 // Mix the audio
 168                 SDL_MixAudio( stream, stream, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 169
 170                 // No audio left
 171                 this->audio_avail = 0;
 172         }
 173         pthread_cond_broadcast( &this->audio_cond );
 174         pthread_mutex_unlock( &this->audio_mutex );
 175 }
 176
 177 /** Threaded wrapper for pipe.
 178 */
 179
 180 static void *consumer_thread( void *arg )
 181 {
 182         // Identify the arg
 183         consumer_sdl this = arg;
 184
 185         // Get the consumer
 186         mlt_consumer consumer = &this->parent;
 187
 188         // Get the service assoicated to the consumer
 189         mlt_service service = mlt_consumer_service( consumer );
 190
 191         // Define a frame pointer
 192         mlt_frame frame;
 193
 194         // internal intialization
 195         int sdl_flags = SDL_HWSURFACE | SDL_DOUBLEBUF | SDL_HWACCEL | SDL_RESIZABLE;
 196         SDL_Surface *sdl_screen = NULL;
 197         SDL_Overlay *sdl_overlay = NULL;
 198         uint8_t *buffer = NULL;
 199         int init_audio = 1;
 200         int bytes;
 201
 202         if ( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_NOPARACHUTE ) < 0 )
 203         {
 204                 fprintf( stderr, "Failed to initialize SDL: %s\n", SDL_GetError() );
 205                 return NULL;
 206         }
 207
 208         // Loop until told not to
 209         while( this->running )
 210         {
 211                 // Get a frame from the service (should never return anything other than 0)
 212                 if ( mlt_service_get_frame( service, &frame, 0 ) == 0 )
 213                 {
 214                         mlt_image_format vfmt = mlt_image_yuv422;
 215                         int width = this->width, height = this->height;
 216                         uint8_t *image;
 217
 218                         mlt_audio_format afmt = mlt_audio_pcm;
 219                         int channels;
 220                         int samples;
 221                         int frequency;
 222                         int16_t *pcm;
 223                         int changed = 0;
 224
 225                         mlt_frame_get_audio( frame, &pcm, &afmt, &frequency, &channels, &samples );
 226                         if ( init_audio == 1 )
 227                         {
 228                                 SDL_AudioSpec request;
 229
 230                                 // specify audio format
 231                                 request.freq = frequency;
 232                                 request.format = AUDIO_S16;
 233                                 request.channels = channels;
 234                                 request.samples = 1024;
 235                                 request.callback = sdl_fill_audio;
 236                                 request.userdata = (void *)this;
 237                                 if ( SDL_OpenAudio( &request, NULL ) < 0 )
 238                                 {
 239                                         fprintf( stderr, "SDL failed to open audio: %s\n", SDL_GetError() );
 240                                         break;
 241                                 }
 242                                 SDL_PauseAudio( 0 );
 243                                 init_audio = 0;
 244                         }
 245                         bytes = ( samples * channels * 2 );
 246                         pthread_mutex_lock( &this->audio_mutex );
 247                         while ( bytes > ( sizeof( this->audio_buffer) - this->audio_avail ) )
 248                                 pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 249                         memcpy( &this->audio_buffer[ this->audio_avail ], pcm, bytes );
 250                         this->audio_avail += bytes;
 251                         pthread_cond_broadcast( &this->audio_cond );
 252                         pthread_mutex_unlock( &this->audio_mutex );
 253
 254                         // Get the image, width and height
 255                         mlt_frame_get_image( frame, &image, &vfmt, &width, &height, 0 );
 256
 257                         if ( sdl_screen != NULL )
 258                         {
 259                                 SDL_Event event;
 260
 261                                 changed = consumer_get_dimensions( &this->window_width, &this->window_height );
 262
 263                                 while ( SDL_PollEvent( &event ) )
 264                                 {
 265                                         switch( event.type )
 266                                         {
 267                                                 case SDL_VIDEORESIZE:
 268                                                         this->window_width = event.resize.w;
 269                                                         this->window_height = event.resize.h;
 270                                                         changed = 1;
 271                                                         break;
 272                                         }
 273                                 }
 274                         }
 275
 276                         if ( sdl_screen == NULL || changed )
 277                         {
 278                                 double aspect_ratio = mlt_frame_get_aspect_ratio( frame );
 279
 280                                 if ( this->window_width == 0 || this->window_height == 0 )
 281                                 {
 282                                         this->window_width = width;
 283                                         this->window_height = height;
 284                                 }
 285
 286                                 // open SDL window with video overlay, if possible
 287                                 sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 0, sdl_flags );
 288
 289                                 if ( sdl_screen != NULL )
 290                                 {
 291                                         SDL_Rect rect;
 292                                         if ( this->window_width < this->window_height * aspect_ratio )
 293                                         {
 294                                                 rect.w = this->window_width;
 295                                                 rect.h = this->window_width / aspect_ratio;
 296                                         }
 297                                         else
 298                                         {
 299                                                 rect.w = this->window_height * aspect_ratio;
 300                                                 rect.h = this->window_height;
 301                                         }
 302
 303                                         rect.x = ( this->window_width - rect.w ) / 2;
 304                                         rect.y = ( this->window_height - rect.h ) / 2;
 305
 306                                         SDL_SetClipRect( sdl_screen, &rect );
 307
 308                                         // Force an overlay recreation
 309                                         if ( sdl_overlay != NULL )
 310                                                 SDL_FreeYUVOverlay( sdl_overlay );
 311                                         sdl_lock_display();
 312                                         sdl_overlay = SDL_CreateYUVOverlay( width, height, SDL_YUY2_OVERLAY, sdl_screen );
 313                                         sdl_unlock_display();
 314                                 }
 315                         }
 316
 317                         if ( sdl_screen != NULL && sdl_overlay != NULL )
 318                         {
 319                                 buffer = sdl_overlay->pixels[ 0 ];
 320                                 if ( sdl_lock_display() )
 321                                 {
 322                                         if ( SDL_LockYUVOverlay( sdl_overlay ) >= 0 )
 323                                         {
 324                                                 memcpy( buffer, image, width * height * 2 );
 325                                                 SDL_UnlockYUVOverlay( sdl_overlay );
 326                                                 SDL_DisplayYUVOverlay( sdl_overlay, &sdl_screen->clip_rect );
 327                                         }
 328                                         sdl_unlock_display();
 329                                 }
 330                         }
 331                         else
 332                         {
 333                                 // TODO: allocate buffer?
 334                         }
 335
 336                         // Close the frame
 337                         mlt_frame_close( frame );
 338                 }
 339                 else
 340                 {
 341                         break;
 342                 }
 343         } // while
 344
 345         // internal cleanup
 346         if ( init_audio == 0 )
 347                 SDL_AudioQuit( );
 348         if ( sdl_overlay != NULL )
 349                 SDL_FreeYUVOverlay( sdl_overlay );
 350         SDL_Quit( );
 351
 352         return NULL;
 353 }
 354
 355 static int consumer_get_dimensions( int *width, int *height )
 356 {
 357         int changed = 0;
 358
 359         // SDL windows manager structure
 360         SDL_SysWMinfo wm;
 361
 362         // Specify the SDL Version
 363         SDL_VERSION( &wm.version );
 364
 365         // Get the wm structure
 366         if ( SDL_GetWMInfo( &wm ) == 1 )
 367         {
 368                 // Check that we have the X11 wm
 369                 if ( wm.subsystem == SDL_SYSWM_X11 )
 370                 {
 371                         // Get the SDL window
 372                         Window window = wm.info.x11.window;
 373
 374                         // Get the display session
 375                         Display *display = wm.info.x11.display;
 376
 377                         // Get the window attributes
 378                         XWindowAttributes attr;
 379                         XGetWindowAttributes( display, window, &attr );
 380
 381                         // Determine whether window has changed
 382                         changed = *width != attr.width || *height != attr.height;
 383
 384                         // Return width and height
 385                         *width = attr.width;
 386                         *height = attr.height;
 387                 }
 388         }
 389
 390         return changed;
 391 }
 392
 393 /** Callback to allow override of the close method.
 394 */
 395
 396 static void consumer_close( mlt_consumer parent )
 397 {
 398         // Get the actual object
 399         consumer_sdl this = parent->child;
 400
 401         // Kill the thread and clean up
 402         this->running = 0;
 403
 404         pthread_mutex_lock( &this->audio_mutex );
 405         pthread_cond_broadcast( &this->audio_cond );
 406         pthread_mutex_unlock( &this->audio_mutex );
 407
 408         pthread_join( this->thread, NULL );
 409         pthread_mutex_destroy( &this->audio_mutex );
 410         pthread_cond_destroy( &this->audio_cond );
 411
 412         // Now clean up the rest (the close = NULL is a bit nasty but needed for now)
 413         parent->close = NULL;
 414         mlt_consumer_close( parent );
 415
 416         // Finally clean up this
 417         free( this );
 418 }
 419