[vlc-devel] [PATCH] adding invmem (all-in-one patch)

Robert Paciorek robert at opcode.eu.org
Wed Dec 3 20:03:00 CET 2008


This module make possible uses libvlc as output (not input as vmem) for
video stream rendering in aplication ... motivation to create this patch can
find at http://forum.videolan.org/viewtopic.php?f=32&t=53256

Usage is similar to vmem output module. We need next vlc_argv[] options:
   "--codec", "invmem",
   "--invmem-width", width,
   "--invmem-height", height,
   "--invmem-lock", clock,
   "--invmem-unlock", cunlock,
   "--invmem-data", cdata,
and calling libvlc_media_new with "fake://" access string:
   libvlc_media_new(libvlc, "fake://", &ex);
---
 modules/codec/Modules.am |    2 +
 modules/codec/invmem.c   |  212 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 214 insertions(+), 0 deletions(-)
 create mode 100644 modules/codec/invmem.c

diff --git a/modules/codec/Modules.am b/modules/codec/Modules.am
index 0f87d0d..e69f556 100644
--- a/modules/codec/Modules.am
+++ b/modules/codec/Modules.am
@@ -25,6 +25,7 @@ SOURCES_png = png.c
 SOURCES_svcdsub = svcdsub.c
 SOURCES_cvdsub = cvdsub.c
 SOURCES_fake = fake.c
+SOURCES_invmem = invmem.c
 SOURCES_realaudio = realaudio.c
 SOURCES_realvideo = realvideo.c
 SOURCES_sdl_image = sdl_image.c
@@ -53,4 +54,5 @@ libvlc_LTLIBRARIES += \
 	libmpeg_audio_plugin.la \
 	librawvideo_plugin.la \
 	libsvcdsub_plugin.la \
+	libinvmem_plugin.la \
 	$(NULL)
diff --git a/modules/codec/invmem.c b/modules/codec/invmem.c
new file mode 100644
index 0000000..1703243
--- /dev/null
+++ b/modules/codec/invmem.c
@@ -0,0 +1,212 @@
+/*****************************************************************************
+ * invmem_decoder.c: memory video driver for vlc
+ *****************************************************************************
+ * Copyright (C) 2008 the VideoLAN team
+ * $Id$
+ *
+ * Authors: Robert Paciorek <robert at opcode.eu.org> <http://opcode.eu.org/bercik>
+ * based on:
+ *  - vmem video output module (Gildas Bazin <gbazin at videolan.org>)
+ *  - png video decodec module (Sam Hocevar <sam at zoy.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
+ *****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <vlc_common.h>
+#include <vlc_plugin.h>
+#include <vlc_codec.h>
+
+#include <vlc_image.h>
+#include <vlc_filter.h>
+
+/*****************************************************************************
+ * Local prototypes
+ *****************************************************************************/
+static int  OpenDecoder   ( vlc_object_t * );
+static void CloseDecoder  ( vlc_object_t * );
+
+static picture_t *DecodeBlock  ( decoder_t *, block_t ** );
+
+/*****************************************************************************
+ * Module descriptor
+ *****************************************************************************/
+#define T_WIDTH N_( "Width" )
+#define LT_WIDTH N_( "Video memory buffer width." )
+
+#define T_HEIGHT N_( "Height" )
+#define LT_HEIGHT N_( "Video memory buffer height." )
+
+#define T_LOCK N_( "Lock function" )
+#define LT_LOCK N_( "Address of the locking callback function. This " \
+                    "function must return a valid memory address for use " \
+                    "by the video renderer." )
+
+#define T_UNLOCK N_( "Unlock function" )
+#define LT_UNLOCK N_( "Address of the unlocking callback function" )
+
+#define T_DATA N_( "Callback data" )
+#define LT_DATA N_( "Data for the locking and unlocking functions" )
+
+#define INVMEM_HELP N_( "This module make possible making video stream from raw-image " \
+                        "generating (to memory) from rendering program uses libvlc. " \
+                        "To use this module from libvlc set --codec to invmem, "\
+                        "set all --invmem-* options in vlc_argv an use " \
+                        "libvlc_media_new(libvlc, \"fake://\", &ex);. " \
+                        "Besides is simillar to vmem video output module." )
+vlc_module_begin();
+    set_category( CAT_INPUT );
+    set_subcategory( SUBCAT_INPUT_VCODEC );
+    set_shortname( N_("Memory video decoder") );
+    set_description( N_("Memory video decoder") );
+    set_help( INVMEM_HELP );
+    set_capability( "decoder", 50 );
+    set_callbacks( OpenDecoder, CloseDecoder );
+    add_shortcut( "invmem" );
+
+    add_integer( "invmem-width", "0", NULL, T_WIDTH, LT_WIDTH, false );
+    add_integer( "invmem-height", "0", NULL, T_HEIGHT, LT_HEIGHT, false );
+    add_string( "invmem-lock", "0", NULL, T_LOCK, LT_LOCK, true );
+    add_string( "invmem-unlock", "0", NULL, T_UNLOCK, LT_UNLOCK, true );
+    add_string( "invmem-data", "0", NULL, T_DATA, LT_DATA, true );
+vlc_module_end();
+
+
+struct decoder_sys_t
+{
+    void * (*pf_lock) (void *);
+    void (*pf_unlock) (void *);
+    void *p_data;
+
+    int i_width;
+    int i_height;
+    int i_pitch;
+
+    picture_t *p_pic;
+};
+
+
+/*****************************************************************************
+ * OpenDecoder: probe the decoder and return score
+ *****************************************************************************/
+static int OpenDecoder( vlc_object_t *p_this )
+{
+    decoder_t *p_dec = (decoder_t*)p_this;
+    decoder_sys_t *p_sys;
+    char *psz_tmp;
+
+    if( p_dec->fmt_in.i_codec != VLC_FOURCC('f','a','k','e'))
+    {
+        return VLC_EGENERIC;
+    }
+
+    /* Allocate the memory needed to store the decoder's structure */
+    if( ( p_dec->p_sys = p_sys =
+          (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
+        return VLC_ENOMEM;
+
+    // get parametrs
+    p_sys->i_width = var_CreateGetInteger( p_this, "invmem-width" );
+    p_sys->i_height = var_CreateGetInteger( p_this, "invmem-height" );
+    if (p_sys->i_width == 0 || p_sys->i_height == 0) {
+        msg_Err( p_dec, "--vmem-width and --vmem-height must be > 0" );
+        return VLC_EGENERIC;
+    }
+
+    psz_tmp = var_CreateGetString( p_dec, "invmem-lock" );
+    p_sys->pf_lock = (void * (*) (void *))(intptr_t)atoll( psz_tmp );
+    free( psz_tmp );
+
+    psz_tmp = var_CreateGetString( p_dec, "invmem-unlock" );
+    p_sys->pf_unlock = (void (*) (void *))(intptr_t)atoll( psz_tmp );
+    free( psz_tmp );
+
+    psz_tmp = var_CreateGetString( p_dec, "invmem-data" );
+    p_sys->p_data = (void *)(intptr_t)atoll( psz_tmp );
+    free( psz_tmp );
+
+    if( !p_sys->pf_lock || !p_sys->pf_unlock )
+    {
+        msg_Err( p_dec, "Invalid lock or unlock callbacks" );
+        return VLC_EGENERIC;
+    }
+
+    /* Set output properties */
+    p_dec->fmt_out.i_cat = VIDEO_ES;
+    //p_dec->fmt_out.i_codec = VLC_FOURCC('R','G','B','A');
+    p_dec->fmt_out.i_codec = VLC_FOURCC('R','V','2','4');
+    p_dec->fmt_out.video.i_width = p_dec->p_sys->i_width;
+    p_dec->fmt_out.video.i_height = p_dec->p_sys->i_height;
+    p_dec->fmt_out.video.i_aspect = VOUT_ASPECT_FACTOR * p_dec->p_sys->i_width / p_dec->p_sys->i_height;
+    p_dec->fmt_out.video.i_rmask = 0xff0000;
+    p_dec->fmt_out.video.i_gmask = 0x00ff00;
+    p_dec->fmt_out.video.i_bmask = 0x0000ff;
+    p_dec->fmt_out.i_cat = VIDEO_ES;
+
+    p_sys->i_pitch = p_sys->i_width*3 + p_sys->i_width%4;
+
+    // create new picture
+    p_sys->p_pic = p_dec->pf_vout_buffer_new( p_dec );
+
+    /* Set callbacks */
+    p_dec->pf_decode_video = DecodeBlock;
+
+    return VLC_SUCCESS;
+}
+
+/****************************************************************************
+ * DecodeBlock: the whole thing
+ ****************************************************************************
+ * This function must be fed with a complete compressed frame.
+ ****************************************************************************/
+static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
+{
+    decoder_sys_t *p_sys = p_dec->p_sys;
+
+    if( !pp_block || !*pp_block ) return NULL;
+
+    // create new picture
+    picture_Release( p_sys->p_pic );
+    p_sys->p_pic = p_dec->pf_vout_buffer_new( p_dec );
+    p_sys->p_pic->b_force = true;
+    p_sys->p_pic->p->i_pitch = p_dec->p_sys->i_pitch;
+
+   // lock input and copy to picture
+    p_sys->p_pic->p->p_pixels = p_sys->pf_lock( p_dec->p_sys->p_data );
+
+    // unlock input
+    p_sys->pf_unlock( p_dec->p_sys->p_data );
+
+    block_Release( *pp_block ); *pp_block = NULL;
+    return p_sys->p_pic;
+}
+
+/*****************************************************************************
+ * CloseDecoder: invmem decoder destruction
+ *****************************************************************************/
+static void CloseDecoder( vlc_object_t *p_this )
+{
+    decoder_t *p_dec = (decoder_t *)p_this;
+    decoder_sys_t *p_sys = p_dec->p_sys;
+
+    free( p_sys );
+}
-- 
1.5.6.5




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