[vlc-devel] [PATCH v3] video_output: add support for Flaschen-Taschen screen protocol

François Revol revol at free.fr
Wed Jul 20 00:01:07 CEST 2016


cf.
https://github.com/hzeller/flaschen-taschen/blob/master/doc/protocols.md

* TODO implement offset_{x,y,z} ? (mostly useful for games though)
* TODO try to fix aspect ratio (it's 1:1 always)
* TODO limit the framerate? It's meant to be used over a LAN, but still...
---
 modules/video_output/Makefile.am |   2 +
 modules/video_output/flaschen.c  | 249 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 251 insertions(+)
 create mode 100644 modules/video_output/flaschen.c

diff --git a/modules/video_output/Makefile.am b/modules/video_output/Makefile.am
index e05d02a..24b77ba 100644
--- a/modules/video_output/Makefile.am
+++ b/modules/video_output/Makefile.am
@@ -367,11 +367,13 @@ endif
 
 
 ### Common ###
+libflaschen_plugin_la_SOURCES = video_output/flaschen.c
 libvdummy_plugin_la_SOURCES = video_output/vdummy.c
 libvmem_plugin_la_SOURCES = video_output/vmem.c
 libyuv_plugin_la_SOURCES = video_output/yuv.c
 
 vout_LTLIBRARIES += \
+	libflaschen_plugin.la \
 	libvdummy_plugin.la \
 	libvmem_plugin.la \
 	libyuv_plugin.la
diff --git a/modules/video_output/flaschen.c b/modules/video_output/flaschen.c
new file mode 100644
index 0000000..2eeffab
--- /dev/null
+++ b/modules/video_output/flaschen.c
@@ -0,0 +1,249 @@
+/*****************************************************************************
+ * flaschentaschen.c: Flaschen-Taschen video output display for vlc
+ * cf. https://github.com/hzeller/flaschen-taschen
+ *****************************************************************************
+ * Copyright (C) 2000-2009 VLC authors and VideoLAN
+ * Copyright (C) 2016 François Revol <revol at free.fr>
+ *
+ * Includes code from vdummy.c and aa.c:
+ * Authors: Samuel Hocevar <sam at zoy.org>
+ * Authors: Sigmund Augdal Helberg <dnumgis at videolan.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser 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 <errno.h>
+
+#include <vlc_common.h>
+#include <vlc_fs.h>
+#include <vlc_network.h>
+#include <vlc_plugin.h>
+#include <vlc_vout_display.h>
+
+#define T_FLDISPLAY N_("Flaschen-Taschen display address")
+#define LT_FLDISPLAY N_( \
+    "IP address or hostname of the Flaschen-Taschen display. " \
+    "Something like ft.noise or ftkleine.noise")
+
+#define T_WIDTH N_("Width")
+#define LT_WIDTH N_("Video width")
+
+#define T_HEIGHT N_("Height")
+#define LT_HEIGHT N_("Video height")
+
+static int Open( vlc_object_t * );
+static void Close( vlc_object_t * );
+
+vlc_module_begin ()
+    set_shortname( N_("Flaschen") )
+    set_description( N_("Flaschen-Taschen video output") )
+    set_capability( "vout display", 0 )
+    set_callbacks( Open, Close )
+    add_shortcut( "flaschen" )
+
+    set_category( CAT_VIDEO )
+    set_subcategory( SUBCAT_VIDEO_VOUT )
+    add_string( "flaschen-display", NULL, T_FLDISPLAY, LT_FLDISPLAY, true )
+    add_integer("flaschen-width", 25, T_WIDTH, LT_WIDTH, false)
+    add_integer("flaschen-height", 20, T_HEIGHT, LT_HEIGHT, false)
+vlc_module_end ()
+
+
+/*****************************************************************************
+ * Local prototypes
+ *****************************************************************************/
+struct vout_display_sys_t {
+    int             fd;
+
+    picture_pool_t *pool;
+};
+static picture_pool_t *Pool(vout_display_t *, unsigned count);
+static void            Display(vout_display_t *, picture_t *, subpicture_t *);
+static int             Control(vout_display_t *, int, va_list);
+
+/*****************************************************************************
+ * Open: activates flaschen vout display method
+ *****************************************************************************/
+static int Open(vlc_object_t *object)
+{
+    vout_display_t *vd = (vout_display_t *)object;
+    vout_display_sys_t *sys;
+    int fd;
+    unsigned port = 1337;
+
+    vd->sys = sys = calloc(1, sizeof(*sys));
+    if (!sys)
+        return VLC_ENOMEM;
+    sys->pool = NULL;
+    sys->fd = -1;
+
+    /* */
+    video_format_t fmt = vd->fmt;
+    fmt.i_chroma = VLC_CODEC_RGB24;
+    /* TODO: check if this works on big-endian systems */
+    fmt.i_rmask = 0xff0000;
+    fmt.i_gmask = 0x00ff00;
+    fmt.i_bmask = 0x0000ff;
+    fmt.i_width  = var_InheritInteger(vd, "flaschen-width");
+    fmt.i_height = var_InheritInteger(vd, "flaschen-height");
+    fmt.i_visible_width = fmt.i_width;
+    fmt.i_visible_height = fmt.i_height;
+
+    /* p_vd->info is not modified */
+
+    char *display = var_InheritString(vd, "flaschen-display");
+    if (display == NULL) {
+        msg_Err(vd, "missing flaschen-display");
+        free(sys);
+        return VLC_EGENERIC;
+    }
+    msg_Dbg(vd, "using display at %s (%dx%d)", display, fmt.i_width, fmt.i_height);
+
+    fd = net_ConnectDgram( vd, display, port, -1, IPPROTO_UDP );
+
+    if( fd == -1 )
+    {
+        msg_Err( vd,
+                 "cannot create UDP socket for %s port %u",
+                 display, port );
+        free(display);
+        free(sys);
+        return VLC_EGENERIC;
+    }
+    free(display);
+    sys->fd = fd;
+
+    /* Ignore any unexpected incoming packet */
+    setsockopt (fd, SOL_SOCKET, SO_RCVBUF, &(int){ 0 }, sizeof (int));
+
+
+    vd->fmt     = fmt;
+
+    vd->pool    = Pool;
+    vd->prepare = NULL;
+    vd->display = Display;
+    vd->control = Control;
+    vd->manage  = NULL;
+
+    vout_display_DeleteWindow(vd, NULL);
+
+    return VLC_SUCCESS;
+}
+
+static void Close(vlc_object_t *object)
+{
+    vout_display_t *vd = (vout_display_t *)object;
+    vout_display_sys_t *sys = vd->sys;
+
+    if (sys->pool)
+        picture_pool_Release(sys->pool);
+
+    net_Close(sys->fd);
+    free(sys);
+}
+
+static picture_pool_t *Pool(vout_display_t *vd, unsigned count)
+{
+    vout_display_sys_t *sys = vd->sys;
+    if (!sys->pool)
+        sys->pool = picture_pool_NewFromFormat(&vd->fmt, count);
+    return sys->pool;
+}
+
+static void Display(vout_display_t *vd, picture_t *picture, subpicture_t *subpicture)
+{
+#ifdef IOV_MAX
+    const long iovmax = IOV_MAX;
+#else
+    const long iovmax = sysconf(_SC_IOV_MAX);
+#endif
+    vout_display_sys_t *sys = vd->sys;
+    int result;
+    VLC_UNUSED(subpicture);
+
+    char buffer[64];
+    int header_len = snprintf(buffer, sizeof(buffer), "P6\n%d %d\n255\n",
+                              vd->fmt.i_width, vd->fmt.i_height);
+    /* TODO: support offset_{x,y,z}? (#FT:...) */
+    /* Note the protocol doesn't include any picture order field. */
+    /* (maybe add as comment?) */
+
+    int iovcnt = 1 + vd->fmt.i_height;
+    if (unlikely(iovcnt > iovmax))
+        return;
+
+    struct iovec iov[iovcnt];
+    iov[0].iov_base = buffer;
+    iov[0].iov_len = header_len;
+
+    uint8_t *src = picture->p->p_pixels;
+    for (int i = 1; i < iovcnt; i++)
+    {
+        iov[i].iov_base = src;
+        iov[i].iov_len = vd->fmt.i_width * 3;
+        src += picture->p->i_pitch;
+    }
+
+    struct msghdr hdr;
+    hdr.msg_name = NULL;
+    hdr.msg_namelen = 0;
+    hdr.msg_iov = iov;
+    hdr.msg_iovlen = iovcnt;
+    hdr.msg_control = NULL;
+    hdr.msg_controllen = 0;
+    hdr.msg_flags = 0;
+
+    result = sendmsg(sys->fd, &hdr, 0);
+    if (result < 0)
+        msg_Err(vd, "sendmsg: error %s in vout display flaschen", vlc_strerror_c(errno));
+    else if (result < (int)(header_len + vd->fmt.i_width * vd->fmt.i_height * 3))
+        msg_Err(vd, "sendmsg only sent %d bytes in vout display flaschen", result);
+        /* we might want to drop some frames? */
+
+    picture_Release(picture);
+}
+
+/**
+ * Control for vout display
+ */
+static int Control(vout_display_t *vd, int query, va_list args)
+{
+    VLC_UNUSED(args);
+
+    switch (query) {
+    case VOUT_DISPLAY_CHANGE_DISPLAY_SIZE:
+    case VOUT_DISPLAY_CHANGE_ZOOM:
+    case VOUT_DISPLAY_CHANGE_DISPLAY_FILLED:
+    case VOUT_DISPLAY_CHANGE_SOURCE_ASPECT:
+    case VOUT_DISPLAY_CHANGE_FULLSCREEN:
+        return VLC_EGENERIC;
+
+    case VOUT_DISPLAY_HIDE_MOUSE:
+        /* not really working */
+        return VLC_SUCCESS;
+
+    default:
+        msg_Err(vd, "Unsupported query in vout display flaschen");
+        return VLC_EGENERIC;
+    }
+}
-- 
2.8.1



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