tvheadend/v4l.c

352 lines
6.6 KiB
C

/*
* TV Input - Linux analogue (v4lv2) interface
* Copyright (C) 2007 Andreas Öman
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <pthread.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#define __user
#include <linux/videodev2.h>
#include <libhts/htscfg.h>
#include "tvhead.h"
#include "v4l.h"
#include "channels.h"
#include "dispatch.h"
#include "transports.h"
struct th_v4l_adapter_list v4l_adapters;
static void v4l_fd_callback(int events, void *opaque, int fd);
static int v4l_setfreq(th_v4l_adapter_t *tva, int frequency);
static void v4l_add_adapter(const char *path);
static void v4l_stop_feed(th_transport_t *t);
static int v4l_start_feed(th_transport_t *t, unsigned int weight, int status);
/*
*
*/
void
v4l_init(void)
{
v4l_add_adapter("/dev/video0");
}
/*
*
*/
int
v4l_configure_transport(th_transport_t *t, const char *muxname,
const char *channel_name)
{
config_entry_t *ce;
char buf[100];
if((ce = find_mux_config("v4lmux", muxname)) == NULL)
return -1;
t->tht_type = TRANSPORT_V4L;
t->tht_start_feed = v4l_start_feed;
t->tht_stop_feed = v4l_stop_feed;
t->tht_v4l_frequency =
atoi(config_get_str_sub(&ce->ce_sub, "frequency", "0"));
t->tht_video = transport_add_stream(t, -1, HTSTV_MPEG2VIDEO);
t->tht_audio = transport_add_stream(t, -1, HTSTV_MPEG2AUDIO);
snprintf(buf, sizeof(buf), "Analog: %s (%.2f MHz)", muxname,
(float)t->tht_v4l_frequency / 1000000.0f);
t->tht_name = strdup(buf);
t->tht_provider = strdup("Analog TV");
snprintf(buf, sizeof(buf), "analog_%u", t->tht_v4l_frequency);
t->tht_identifier = strdup(buf);
t->tht_chname = strdup(channel_name);
transport_map_channel(t, NULL);
return 0;
}
/*
*
*/
static void
v4l_add_adapter(const char *path)
{
int fd, r;
th_v4l_adapter_t *tva;
struct v4l2_capability caps;
fd = open(path, O_RDWR);
if(fd == -1)
return;
r = ioctl(fd, VIDIOC_QUERYCAP, &caps);
close(fd);
if(r < 0)
return;
tva = calloc(1, sizeof(th_v4l_adapter_t));
pthread_cond_init(&tva->tva_run_cond, NULL);
tva->tva_path = strdup(path);
LIST_INSERT_HEAD(&v4l_adapters, tva, tva_link);
tva->tva_name = strdup((char *)caps.card);
}
/*
*
*/
static int
v4l_setfreq(th_v4l_adapter_t *tva, int frequency)
{
struct v4l2_frequency vf;
struct v4l2_tuner vt;
int result;
memset(&vf, 0, sizeof(vf));
memset(&vt, 0, sizeof(vt));
vf.tuner = 0;
vf.type = V4L2_TUNER_ANALOG_TV;
vf.frequency = (frequency * 16) / 1000000;
result = ioctl(tva->tva_fd, VIDIOC_S_FREQUENCY, &vf);
if(result < 0) {
syslog(LOG_ERR, "%s: Unable to tune to %dHz\n", tva->tva_path, frequency);
return 1;
}
vt.index = 0;
result = ioctl(tva->tva_fd, VIDIOC_G_TUNER, &vt);
if(result < 0) {
syslog(LOG_ERR, "%s: Unable read tuner status\n", tva->tva_path);
return 1;
}
syslog(LOG_DEBUG, "%s: Tuned to %.3f MHz%s",
tva->tva_path, (float)frequency/1000000.0,
vt.signal ? " (Signal Detected)" : "");
return 0;
}
/*
*
*/
static void
v4l_stop(th_v4l_adapter_t *tva)
{
if(tva->tva_dispatch_handle != NULL) {
close(dispatch_delfd(tva->tva_dispatch_handle));
tva->tva_dispatch_handle = NULL;
}
tva->tva_startcode = 0;
}
/*
*
*/
static void
v4l_stop_feed(th_transport_t *t)
{
th_v4l_adapter_t *tva = t->tht_v4l_adapter;
t->tht_v4l_adapter = NULL;
LIST_REMOVE(t, tht_active_link);
t->tht_runstatus = TRANSPORT_IDLE;
if(LIST_FIRST(&tva->tva_transports) == NULL)
v4l_stop(tva);
}
/*
*
*/
static void
v4l_adapter_clean(th_v4l_adapter_t *tva)
{
th_transport_t *t;
while((t = LIST_FIRST(&tva->tva_transports)) != NULL)
v4l_stop_feed(t);
v4l_stop(tva);
}
/*
*
*/
static int
v4l_start_feed(th_transport_t *t, unsigned int weight, int status)
{
th_v4l_adapter_t *tva, *cand = NULL;
int w, fd;
LIST_FOREACH(tva, &v4l_adapters, tva_link) {
w = transport_compute_weight(&tva->tva_transports);
if(w < weight)
cand = tva;
if(tva->tva_frequency == t->tht_v4l_frequency)
break;
}
if(tva == NULL) {
if(cand == NULL)
return 1;
v4l_adapter_clean(cand);
tva = cand;
}
if(tva->tva_dispatch_handle == NULL) {
fd = open(tva->tva_path, O_RDWR);
if(fd == -1)
return 1;
tva->tva_dispatch_handle =
dispatch_addfd(fd, v4l_fd_callback, tva, DISPATCH_READ);
tva->tva_fd = fd;
}
tva->tva_frequency = t->tht_v4l_frequency;
if(v4l_setfreq(tva, tva->tva_frequency))
return 1;
LIST_INSERT_HEAD(&tva->tva_transports, t, tht_active_link);
t->tht_v4l_adapter = tva;
t->tht_runstatus = TRANSPORT_RUNNING;
return 0;
}
static void
v4l_fd_callback(int events, void *opaque, int fd)
{
th_v4l_adapter_t *tva = opaque;
th_transport_t *t;
th_stream_t *st;
uint8_t buf[4000];
uint8_t *ptr, *pkt;
int len, l, r;
if(!(events & DISPATCH_READ))
return;
len = read(fd, buf, 4000);
if(len < 1)
return;
t = LIST_FIRST(&tva->tva_transports);
if(t == NULL)
return;
ptr = buf;
while(len > 0) {
switch(tva->tva_startcode) {
default:
tva->tva_startcode = tva->tva_startcode << 8 | *ptr;
tva->tva_lenlock = 0;
ptr++; len--;
continue;
case 0x000001e0:
st = t->tht_video;
break;
case 0x000001c0:
st = t->tht_audio;
break;
}
if(tva->tva_lenlock == 2) {
l = st->st_buffer_size;
st->st_buffer = pkt = realloc(st->st_buffer, l);
r = l - st->st_buffer_ptr;
if(r > len)
r = len;
memcpy(pkt + st->st_buffer_ptr, ptr, r);
ptr += r;
len -= r;
st->st_buffer_ptr += r;
if(st->st_buffer_ptr == l) {
// pes_packet_input(t, st, pkt, l);
st->st_buffer_size = 0;
tva->tva_startcode = 0;
}
} else {
st->st_buffer_size = st->st_buffer_size << 8 | *ptr;
tva->tva_lenlock++;
if(tva->tva_lenlock == 2) {
st->st_buffer_ptr = 0;
}
ptr++; len--;
}
}
}