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/**
* @file timecode.c
* @brief Time code sub-picture generator for VLC media player
*/
/*****************************************************************************
* Copyright © 2013 Rémi Denis-Courmont
*
* 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 <stdlib.h>
#include <assert.h>
#include <vlc_common.h>
#include <vlc_demux.h>
#include <vlc_plugin.h>
#define FPS_TEXT N_("Frame rate")
static int Open (vlc_object_t *);
static const char *const fps_values[] = { "24/1", "25/1", "30000/1001", "30/1" };
static const char *const fps_texts[] = { "24", "25", "29.97", "30" };
vlc_module_begin ()
set_shortname (N_("Time code"))
set_description (N_("Time code subpicture elementary stream generator"))
set_category (CAT_INPUT)
set_subcategory (SUBCAT_INPUT_ACCESS)
set_capability ("access_demux", 0)
set_callbacks (Open, NULL)
add_string ("timecode-fps", "25/1", FPS_TEXT, FPS_TEXT, false)
change_string_list (fps_values, fps_texts)
change_safe ()
vlc_module_end ()
struct demux_sys_t
{
es_out_id_t *es;
date_t date;
vlc_tick_t next_time;
};
static int DemuxOnce (demux_t *demux, bool master)
{
demux_sys_t *sys = demux->p_sys;
vlc_tick_t pts = date_Get (&sys->date);
lldiv_t d;
unsigned h, m, s, f;
d = lldiv (pts, CLOCK_FREQ);
f = d.rem * sys->date.i_divider_num / sys->date.i_divider_den / CLOCK_FREQ;
d = lldiv (d.quot, 60);
s = d.rem;
d = lldiv (d.quot, 60);
m = d.rem;
h = d.quot;
char *str;
int len = asprintf (&str, "%02u:%02u:%02u:%02u", h, m, s, f);
if (len == -1)
return -1;
block_t *block = block_heap_Alloc (str, len + 1);
if (unlikely(block == NULL))
return -1;
block->i_buffer = len;
assert(str[len] == '\0');
block->i_pts = block->i_dts = pts;
block->i_length = date_Increment (&sys->date, 1) - pts;
es_out_Send (demux->out, sys->es, block);
if (master)
es_out_SetPCR(demux->out, pts);
return 1;
}
static int Demux (demux_t *demux)
{
demux_sys_t *sys = demux->p_sys;
if (sys->next_time == VLC_TICK_INVALID) /* Master mode */
return DemuxOnce (demux, true);
/* Slave mode */
while (sys->next_time > date_Get (&sys->date))
{
int val = DemuxOnce (demux, false);
if (val <= 0)
return val;
}
return 1;
}
static int Control (demux_t *demux, int query, va_list args)
{
demux_sys_t *sys = demux->p_sys;
switch (query)
{
case DEMUX_GET_POSITION:
*va_arg (args, float *) = 0.f;
break;
case DEMUX_GET_LENGTH:
*va_arg (args, int64_t *) = INT64_C(0);
break;
case DEMUX_GET_TIME:
*va_arg (args, int64_t *) = date_Get (&sys->date);
break;
case DEMUX_SET_TIME:
date_Set (&sys->date, va_arg (args, int64_t));
break;
case DEMUX_SET_NEXT_DEMUX_TIME:
{
const vlc_tick_t pts = va_arg (args, int64_t );
if (sys->next_time == VLC_TICK_INVALID) /* first invocation? */
{
date_Set (&sys->date, pts);
date_Decrement (&sys->date, 1);
}
sys->next_time = pts;
break;
}
case DEMUX_GET_PTS_DELAY:
{
int64_t *v = va_arg (args, int64_t *);
*v = INT64_C(1000) * var_InheritInteger (demux, "live-caching");
break;
}
case DEMUX_CAN_PAUSE:
case DEMUX_CAN_CONTROL_PACE:
case DEMUX_CAN_SEEK:
*va_arg (args, bool *) = true;
break;
default:
return VLC_EGENERIC;
}
return VLC_SUCCESS;
}
static int Open (vlc_object_t *obj)
{
demux_t *demux = (demux_t *)obj;
demux_sys_t *sys = vlc_obj_malloc(obj, sizeof (*sys));
if (unlikely(sys == NULL))
return VLC_ENOMEM;
es_format_t fmt;
es_format_Init (&fmt, SPU_ES, VLC_CODEC_ITU_T140);
sys->es = es_out_Add (demux->out, &fmt);
unsigned num, den;
if (var_InheritURational (demux, &num, &den, "timecode-fps")
|| !num || !den)
{
msg_Err (demux, "invalid frame rate");
return VLC_EGENERIC;
}
date_Init (&sys->date, num, den);
date_Set (&sys->date, VLC_TICK_0);
sys->next_time = VLC_TICK_INVALID;
demux->p_sys = sys;
demux->pf_demux = Demux;
demux->pf_control = Control;
return VLC_SUCCESS;
}
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