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