/*****************************************************************************
* decoder_device.c: MMAL-based decoder plugin for Raspberry Pi
*****************************************************************************
* Copyright © 2020 Steve Lhomme
*
* Authors: Steve Lhomme <robux4@videolabs.io>
*
* 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.
*****************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_window.h>
#include <vlc_codec.h>
#include <bcm_host.h>
#include <interface/vcsm/user-vcsm.h>
#include "mmal_picture.h"
static int OpenDecoderDevice(vlc_decoder_device *, vlc_window_t *);
vlc_module_begin()
set_description(N_("MMAL"))
set_callback_dec_device(OpenDecoderDevice, 100)
add_shortcut("mmal")
vlc_module_end()
typedef enum {
VCSM_INIT_NONE = 0,
VCSM_INIT_LEGACY,
VCSM_INIT_CMA
} vcsm_init_type_t;
// Preferred mode - none->cma on Pi4 otherwise legacy
static volatile vcsm_init_type_t last_vcsm_type = VCSM_INIT_NONE;
static vcsm_init_type_t cma_vcsm_init(void)
{
vcsm_init_type_t rv = VCSM_INIT_NONE;
// We don't bother locking - taking a copy here should be good enough
vcsm_init_type_t try_type = last_vcsm_type;
if (try_type == VCSM_INIT_NONE) {
if (bcm_host_is_fkms_active())
try_type = VCSM_INIT_CMA;
else
try_type = VCSM_INIT_LEGACY;
}
if (try_type == VCSM_INIT_CMA) {
if (vcsm_init_ex(1, -1) == 0)
rv = VCSM_INIT_CMA;
else if (vcsm_init_ex(0, -1) == 0)
rv = VCSM_INIT_LEGACY;
}
else
{
if (vcsm_init_ex(0, -1) == 0)
rv = VCSM_INIT_LEGACY;
else if (vcsm_init_ex(1, -1) == 0)
rv = VCSM_INIT_CMA;
}
// Just in case this affects vcsm init do after that
if (rv != VCSM_INIT_NONE)
bcm_host_init();
last_vcsm_type = rv;
return rv;
}
static void cma_vcsm_exit()
{
vcsm_exit();
bcm_host_deinit(); // Does nothing but add in case it ever does
}
static const char * cma_vcsm_init_str(const vcsm_init_type_t init_mode)
{
switch (init_mode)
{
case VCSM_INIT_CMA:
return "CMA";
case VCSM_INIT_LEGACY:
return "Legacy";
default:
vlc_assert_unreachable();
return NULL;
}
}
static void CloseDecoderDevice(vlc_decoder_device *device)
{
VLC_UNUSED(device);
cma_vcsm_exit();
}
static const struct vlc_decoder_device_operations mmal_device_ops = {
.close = CloseDecoderDevice,
};
static int OpenDecoderDevice(vlc_decoder_device *device, vlc_window_t *window)
{
VLC_UNUSED(window);
mmal_decoder_device_t *sys = vlc_obj_malloc(VLC_OBJECT(device), sizeof(mmal_decoder_device_t));
if (unlikely(sys==NULL))
return VLC_ENOMEM;
vcsm_init_type_t vcsm_init_type = cma_vcsm_init();
if (vcsm_init_type == VCSM_INIT_NONE) {
msg_Err(device, "VCSM init failed");
return VLC_EGENERIC;
}
sys->is_cma = vcsm_init_type == VCSM_INIT_CMA;
device->ops = &mmal_device_ops;
device->opaque = sys;
device->type = VLC_DECODER_DEVICE_MMAL;
device->sys = sys;
msg_Warn(device, "VCSM init succeeded: %s", cma_vcsm_init_str(vcsm_init_type));
return VLC_SUCCESS;
}
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(vorverarbeitet am 2026-11-04)
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