Patch from Søren Bøg <avacore@videolan.org> GSoC 2007

Overlay - Basic test/demonstration program

extras/misc/overlay-test.c

+/*****************************************************************************
+ * overlay-test.c : test program for the dynamic overlay plugin
+ *****************************************************************************
+ * Copyright (C) 2007 the VideoLAN team
+ * $Id$
+ *
+ * Author: Søren Bøg <avacore@videolan.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Preamble
+ *****************************************************************************/
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+
+#include <sys/fcntl.h>
+#include <sys/ipc.h>
+#include <sys/shm.h>
+#include <unistd.h>
+
+/*****************************************************************************
+ * Images
+ *****************************************************************************/
+
+#define WIDTH 128
+#define HEIGHT 128
+
+char *p_imageRGBA;
+
+void ImagesCreate( void ) {
+    char *p_data = p_imageRGBA;
+    for( size_t i = 0; i < HEIGHT; ++i ) {
+        for( size_t j = 0; j < HEIGHT; ++j ) {
+            *(p_data++) = i * 4 & 0xFF;
+            *(p_data++) = 0xFF;
+            *(p_data++) = 0x00;
+            *(p_data++) = j * 4 & 0xFF;
+        }
+    }
+}
+
+/*****************************************************************************
+ * I/O Helpers
+ *****************************************************************************/
+
+int IsFailure( char *psz_text ) {
+    return strncmp( psz_text, "SUCCESS:", 8 );
+}
+
+/*****************************************************************************
+ * main
+ *****************************************************************************/
+
+int main( int i_argc, char *ppsz_argv[] ) {
+    if( i_argc != 3 ) {
+        printf( "Incorrect number of parameters.\n"
+                "Usage is: %s command-fifo response-fifo\n", ppsz_argv[0] );
+        exit( -2 );
+    }
+
+    printf( "Creating shared memory..." );
+    int i_shmRGBA = shmget( IPC_PRIVATE, WIDTH * HEIGHT * 4, S_IRWXU );
+    if( i_shmRGBA == -1 ) {
+        printf( " failed\n" );
+        exit( -1 );
+    }
+    printf( " done. ID is %d\n", i_shmRGBA );
+
+    printf( "Attaching shared memory..." );
+    p_imageRGBA = shmat( i_shmRGBA, NULL, 0 );
+    if( p_imageRGBA == -1 ) {
+        printf( " failed\n" );
+        exit( -1 );
+    }
+    printf( " done\n" );
+
+    printf( "Queueing shared memory for destruction..." );
+    if( shmctl( i_shmRGBA, IPC_RMID, 0 ) == -1 ) {
+        printf( " failed\n" );
+        exit( -1 );
+    }
+    printf( " done\n" );
+
+    printf( "Generating images..." );
+    ImagesCreate();
+    printf( " done\n" );
+
+    printf( "Please make sure vlc is running.\n"
+            "You should append parameters similar to the following:\n"
+            "--sub-filter overlay --overlay-input %s --overlay-output %s\n",
+            ppsz_argv[1], ppsz_argv[2] );
+
+    printf( "Opening FIFOs..." );
+    FILE *f_cmd = fopen( ppsz_argv[1], "w" );
+    if( f_cmd == NULL ) {
+        printf( " failed\n" );
+        exit( -1 );
+    }
+    FILE *f_res = fopen( ppsz_argv[2], "r" );
+    if( f_res == NULL ) {
+        printf( " failed\n" );
+        exit( -1 );
+    }
+    printf( " done\n" );
+
+    printf( "Getting an overlay..." );
+    int i_overlay;
+    char psz_resp[9];
+    fprintf( f_cmd, "GenImage\n" );
+    fflush( f_cmd );
+    fscanf( f_res, "%8s", &psz_resp );
+    if( IsFailure( psz_resp ) ) {
+        printf( " failed\n" );
+        exit( -1 );
+    }
+    fscanf( f_res, "%d", &i_overlay );
+    printf( " done. Overlay is %d\n", i_overlay );
+
+    printf( "Sending data..." );
+    fprintf( f_cmd, "DataSharedMem %d %d %d RGBA %d\n", i_overlay, WIDTH,
+             HEIGHT, i_shmRGBA );
+    fflush( f_cmd );
+    fscanf( f_res, "%8s", &psz_resp );
+    if( IsFailure( psz_resp ) ) {
+        printf( " failed\n" );
+        exit( -1 );
+    }
+    printf( " done\n" );
+
+    printf( "Activating overlay..." );
+    fprintf( f_cmd, "SetVisibility %d 1\n", i_overlay );
+    fflush( f_cmd );
+    fscanf( f_res, "%8s", &psz_resp );
+    if( IsFailure( psz_resp ) ) {
+        printf( " failed\n" );
+        exit( -1 );
+    }
+    printf( " done\n" );
+
+    printf( "Sweeping alpha..." );
+    for( int i_alpha = 0xFF; i_alpha >= -0xFF ; i_alpha -= 8 ) {
+        fprintf( f_cmd, "SetAlpha %d %d\n", i_overlay, abs( i_alpha ) );
+        fflush( f_cmd );
+        fscanf( f_res, "%8s", &psz_resp );
+        if( IsFailure( psz_resp ) ) {
+            printf( " failed\n" );
+            exit( -1 );
+        }
+        usleep( 20000 );
+    }
+    fprintf( f_cmd, "SetAlpha %d 255\n", i_overlay );
+    fflush( f_cmd );
+    fscanf( f_res, "%8s", &psz_resp );
+    if( IsFailure( psz_resp ) ) {
+        printf( " failed\n" );
+        exit( -1 );
+    }
+    printf( " done\n" );
+
+    printf( "Circle motion..." );
+    for( float f_theta = 0; f_theta <= 2 * M_PI ; f_theta += M_PI / 64.0 ) {
+        fprintf( f_cmd, "SetPosition %d %d %d\n", i_overlay,
+                 (int)( - cos( f_theta ) * 100.0 + 100.0 ),
+                 (int)( - sin( f_theta ) * 100.0 + 100.0 ) );
+        fflush( f_cmd );
+        fscanf( f_res, "%8s", &psz_resp );
+        if( IsFailure( psz_resp ) ) {
+            printf( " failed\n" );
+            exit( -1 );
+        }
+        usleep( 20000 );
+    }
+    fprintf( f_cmd, "SetPosition %d 0 0\n", i_overlay );
+    fflush( f_cmd );
+    fscanf( f_res, "%8s", &psz_resp );
+    if( IsFailure( psz_resp ) ) {
+        printf( " failed\n" );
+        exit( -1 );
+    }
+    printf( " done\n" );
+
+    printf( "Removing image..." );
+    fprintf( f_cmd, "DeleteImage %d\n", i_overlay );
+    fflush( f_cmd );
+    fscanf( f_res, "%8s", &psz_resp );
+    if( IsFailure( psz_resp ) ) {
+        printf( " failed\n" );
+        exit( -1 );
+    }
+    printf( " done\n" );
+}