1 /*****************************************************************************
2 * scope.c : Scope effect module
3 *****************************************************************************
4 * Copyright (C) 2002 VideoLAN
5 * $Id: scope.c,v 1.1 2002/02/25 04:30:03 sam Exp $
7 * Authors: Samuel Hocevar <sam@zoy.org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
27 #include <stdlib.h> /* malloc(), free() */
28 #include <string.h> /* strdup() */
31 #include <videolan/vlc.h>
34 #include "video_output.h"
36 #include "audio_output.h" /* aout_thread_t */
38 #define SCOPE_WIDTH 640
39 #define SCOPE_HEIGHT 200
40 #define SCOPE_ASPECT (VOUT_ASPECT_FACTOR*SCOPE_WIDTH/SCOPE_HEIGHT)
42 /*****************************************************************************
43 * Capabilities defined in the other files.
44 *****************************************************************************/
45 static void aout_getfunctions( function_list_t * p_function_list );
47 /*****************************************************************************
48 * aout_sys_t: scope audio output method descriptor
49 *****************************************************************************
50 * This structure is part of the audio output thread descriptor.
51 * It describes some scope specific variables.
52 *****************************************************************************/
53 typedef struct aout_sys_s
55 struct aout_fifo_s *p_aout_fifo; /* XXX: unused yet */
56 struct vout_thread_s *p_vout;
60 /*****************************************************************************
61 * Build configuration tree.
62 *****************************************************************************/
67 SET_DESCRIPTION( "scope effect module" )
68 ADD_CAPABILITY( AOUT, 0 )
69 ADD_SHORTCUT( "scope" )
73 aout_getfunctions( &p_module->p_functions->aout );
76 MODULE_DEACTIVATE_START
77 MODULE_DEACTIVATE_STOP
79 /*****************************************************************************
81 *****************************************************************************/
82 static int aout_Open ( aout_thread_t *p_aout );
83 static int aout_SetFormat ( aout_thread_t *p_aout );
84 static int aout_GetBufInfo ( aout_thread_t *p_aout, int i_buffer_info );
85 static void aout_Play ( aout_thread_t *p_aout,
86 byte_t *buffer, int i_size );
87 static void aout_Close ( aout_thread_t *p_aout );
89 /*****************************************************************************
90 * Functions exported as capabilities. They are declared as static so that
91 * we don't pollute the namespace too much.
92 *****************************************************************************/
93 static void aout_getfunctions( function_list_t * p_function_list )
95 p_function_list->functions.aout.pf_open = aout_Open;
96 p_function_list->functions.aout.pf_setformat = aout_SetFormat;
97 p_function_list->functions.aout.pf_getbufinfo = aout_GetBufInfo;
98 p_function_list->functions.aout.pf_play = aout_Play;
99 p_function_list->functions.aout.pf_close = aout_Close;
102 /*****************************************************************************
103 * aout_Open: open a scope effect plugin
104 *****************************************************************************/
105 static int aout_Open( aout_thread_t *p_aout )
107 /* Allocate structure */
108 p_aout->p_sys = malloc( sizeof( aout_sys_t ) );
109 if( p_aout->p_sys == NULL )
111 intf_ErrMsg("error: %s", strerror(ENOMEM) );
115 p_aout->p_sys->p_vout =
116 vout_CreateThread( NULL, SCOPE_WIDTH, SCOPE_HEIGHT,
117 FOURCC_I420, SCOPE_ASPECT );
122 /*****************************************************************************
123 * aout_SetFormat: set the output format
124 *****************************************************************************/
125 static int aout_SetFormat( aout_thread_t *p_aout )
127 /* Force the output method */
128 p_aout->i_format = AOUT_FMT_U16_LE;
129 p_aout->i_channels = 2;
134 /*****************************************************************************
135 * aout_GetBufInfo: buffer status query
136 *****************************************************************************/
137 static int aout_GetBufInfo( aout_thread_t *p_aout, int i_buffer_limit )
139 /* arbitrary value that should be changed */
140 return( i_buffer_limit );
143 /*****************************************************************************
144 * aout_Play: play a sound samples buffer
145 *****************************************************************************
146 * This function writes a buffer of i_length bytes in the socket
147 *****************************************************************************/
148 static void aout_Play( aout_thread_t *p_aout, byte_t *p_buffer, int i_size )
155 /* This is a new frame. Get a structure from the video_output. */
156 while( ( p_outpic = vout_CreatePicture( p_aout->p_sys->p_vout, 0, 0, 0 ) )
163 msleep( VOUT_OUTMEM_SLEEP );
166 /* Blank the picture */
167 for( i_index = 0 ; i_index < p_outpic->i_planes ; i_index++ )
169 memset( p_outpic->p[i_index].p_pixels, i_index ? 0x80 : 0x00,
170 p_outpic->p[i_index].i_lines * p_outpic->p[i_index].i_pitch );
174 for( i_index = 0, p_sample = (u16*)p_buffer;
175 i_index < SCOPE_WIDTH && i_index < i_size / 2;
179 u8 i_value = *p_sample / 256;
181 for( i = 0 ; i < 8 ; i++ )
183 p_pixel = p_outpic->p[0].p_pixels + (p_outpic->p[0].i_pitch * i_index) / SCOPE_WIDTH + p_outpic->p[0].i_lines * (u8)(i_value+128) / 512 * p_outpic->p[0].i_pitch;
185 p_pixel = p_outpic->p[1].p_pixels + (p_outpic->p[1].i_pitch * i_index) / SCOPE_WIDTH + p_outpic->p[1].i_lines * (u8)(i_value+128) / 512 * p_outpic->p[1].i_pitch;
192 for( i_index = 0, p_sample = (u16*)p_buffer + 1;
193 i_index < SCOPE_WIDTH && i_index < i_size / 2;
197 u8 i_value = *p_sample / 256;
199 for( i = 0 ; i < 8 ; i++ )
201 p_pixel = p_outpic->p[0].p_pixels + (p_outpic->p[0].i_pitch * i_index) / SCOPE_WIDTH + (p_outpic->p[0].i_lines * (u8)(i_value+128) / 512 + p_outpic->p[0].i_lines / 2) * p_outpic->p[0].i_pitch;
203 p_pixel = p_outpic->p[2].p_pixels + (p_outpic->p[2].i_pitch * i_index) / SCOPE_WIDTH + (p_outpic->p[2].i_lines * (u8)(i_value+128) / 512 + p_outpic->p[2].i_lines / 2) * p_outpic->p[2].i_pitch;
209 /* Display the picture */
210 vout_DatePicture( p_aout->p_sys->p_vout, p_outpic, p_aout->date );
211 vout_DisplayPicture( p_aout->p_sys->p_vout, p_outpic );
214 /*****************************************************************************
215 * aout_Close: close the Esound socket
216 *****************************************************************************/
217 static void aout_Close( aout_thread_t *p_aout )
219 vout_DestroyThread( p_aout->p_sys->p_vout, NULL );
220 free( p_aout->p_sys );