249 lines
6.4 KiB
C
249 lines
6.4 KiB
C
/**
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* TV headend - Timeshift
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* Copyright (C) 2012 Adam Sutton
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "tvheadend.h"
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#include "streaming.h"
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#include "timeshift.h"
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#include "timeshift/private.h"
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#include "config2.h"
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#include "settings.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/epoll.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <string.h>
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#include <assert.h>
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#include <stdio.h>
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static int timeshift_index = 0;
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uint32_t timeshift_enabled;
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int timeshift_ondemand;
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char *timeshift_path;
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int timeshift_unlimited_period;
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uint32_t timeshift_max_period;
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int timeshift_unlimited_size;
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size_t timeshift_max_size;
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/*
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* Intialise global file manager
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*/
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void timeshift_init ( void )
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{
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htsmsg_t *m;
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const char *str;
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uint32_t u32;
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timeshift_filemgr_init();
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/* Defaults */
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timeshift_enabled = 0; // Disabled
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timeshift_ondemand = 0; // Permanent
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timeshift_path = NULL; // setting dir
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timeshift_unlimited_period = 0;
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timeshift_max_period = 3600; // 1Hr
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timeshift_unlimited_size = 0;
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timeshift_max_size = 10000 * (size_t)1048576; // 10G
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/* Load settings */
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if ((m = hts_settings_load("timeshift/config"))) {
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if (!htsmsg_get_u32(m, "enabled", &u32))
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timeshift_enabled = u32 ? 1 : 0;
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if (!htsmsg_get_u32(m, "ondemand", &u32))
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timeshift_ondemand = u32 ? 1 : 0;
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if ((str = htsmsg_get_str(m, "path")))
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timeshift_path = strdup(str);
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if (!htsmsg_get_u32(m, "unlimited_period", &u32))
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timeshift_unlimited_period = u32 ? 1 : 0;
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htsmsg_get_u32(m, "max_period", ×hift_max_period);
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if (!htsmsg_get_u32(m, "unlimited_size", &u32))
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timeshift_unlimited_size = u32 ? 1 : 0;
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if (!htsmsg_get_u32(m, "max_size", &u32))
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timeshift_max_size = 1048576LL * u32;
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htsmsg_destroy(m);
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}
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}
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/*
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* Terminate global file manager
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*/
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void timeshift_term ( void )
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{
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timeshift_filemgr_term();
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}
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/*
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* Save settings
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*/
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void timeshift_save ( void )
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{
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htsmsg_t *m;
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m = htsmsg_create_map();
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htsmsg_add_u32(m, "enabled", timeshift_enabled);
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htsmsg_add_u32(m, "ondemand", timeshift_ondemand);
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if (timeshift_path)
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htsmsg_add_str(m, "path", timeshift_path);
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htsmsg_add_u32(m, "unlimited_period", timeshift_unlimited_period);
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htsmsg_add_u32(m, "max_period", timeshift_max_period);
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htsmsg_add_u32(m, "unlimited_size", timeshift_unlimited_size);
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htsmsg_add_u32(m, "max_size", timeshift_max_size / 1048576);
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hts_settings_save(m, "timeshift/config");
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}
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/*
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* Receive data
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*/
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static void timeshift_input
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( void *opaque, streaming_message_t *sm )
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{
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int exit = 0;
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timeshift_t *ts = opaque;
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pthread_mutex_lock(&ts->state_mutex);
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/* Control */
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if (sm->sm_type == SMT_SKIP) {
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if (ts->state >= TS_LIVE)
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timeshift_write_skip(ts->rd_pipe.wr, sm->sm_data);
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} else if (sm->sm_type == SMT_SPEED) {
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if (ts->state >= TS_LIVE)
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timeshift_write_speed(ts->rd_pipe.wr, sm->sm_code);
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}
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else {
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/* Start */
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if (sm->sm_type == SMT_START && ts->state == TS_INIT) {
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ts->state = TS_LIVE;
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}
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/* Pass-thru */
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if (ts->state <= TS_LIVE) {
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streaming_target_deliver2(ts->output, streaming_msg_clone(sm));
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}
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/* Check for exit */
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if (sm->sm_type == SMT_EXIT ||
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(sm->sm_type == SMT_STOP && sm->sm_code == 0))
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exit = 1;
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/* Buffer to disk */
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if ((ts->state > TS_LIVE) || (!ts->ondemand && (ts->state == TS_LIVE))) {
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sm->sm_time = getmonoclock();
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streaming_target_deliver2(&ts->wr_queue.sq_st, sm);
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} else
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streaming_msg_free(sm);
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/* Exit/Stop */
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if (exit) {
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timeshift_write_exit(ts->rd_pipe.wr);
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ts->state = TS_EXIT;
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}
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}
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pthread_mutex_unlock(&ts->state_mutex);
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}
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/**
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*
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*/
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void
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timeshift_destroy(streaming_target_t *pad)
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{
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timeshift_t *ts = (timeshift_t*)pad;
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streaming_message_t *sm;
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/* Must hold global lock */
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lock_assert(&global_lock);
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/* Ensure the threads exits */
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// Note: this is a workaround for the fact the Q might have been flushed
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// in reader thread (VERY unlikely)
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pthread_mutex_lock(&ts->state_mutex);
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sm = streaming_msg_create(SMT_EXIT);
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streaming_target_deliver2(&ts->wr_queue.sq_st, sm);
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timeshift_write_exit(ts->rd_pipe.wr);
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pthread_mutex_unlock(&ts->state_mutex);
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/* Wait for all threads */
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pthread_join(ts->rd_thread, NULL);
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pthread_join(ts->wr_thread, NULL);
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/* Shut stuff down */
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streaming_queue_deinit(&ts->wr_queue);
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close(ts->rd_pipe.rd);
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close(ts->rd_pipe.wr);
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/* Flush files */
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timeshift_filemgr_flush(ts, NULL);
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free(ts->path);
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free(ts);
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}
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/**
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* Create timeshift buffer
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*
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* max_period of buffer in seconds (0 = unlimited)
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* max_size of buffer in bytes (0 = unlimited)
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*/
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streaming_target_t *timeshift_create
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(streaming_target_t *out, time_t max_time)
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{
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char buf[512];
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timeshift_t *ts = calloc(1, sizeof(timeshift_t));
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/* Must hold global lock */
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lock_assert(&global_lock);
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/* Create directories */
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if (timeshift_filemgr_makedirs(timeshift_index, buf, sizeof(buf)))
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return NULL;
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/* Setup structure */
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TAILQ_INIT(&ts->files);
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ts->output = out;
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ts->path = strdup(buf);
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ts->max_time = max_time;
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ts->state = TS_INIT;
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ts->full = 0;
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ts->vididx = -1;
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ts->id = timeshift_index;
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ts->ondemand = timeshift_ondemand;
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pthread_mutex_init(&ts->rdwr_mutex, NULL);
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pthread_mutex_init(&ts->state_mutex, NULL);
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/* Initialise output */
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tvh_pipe(O_NONBLOCK, &ts->rd_pipe);
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/* Initialise input */
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streaming_queue_init(&ts->wr_queue, 0);
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streaming_target_init(&ts->input, timeshift_input, ts, 0);
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pthread_create(&ts->wr_thread, NULL, timeshift_writer, ts);
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pthread_create(&ts->rd_thread, NULL, timeshift_reader, ts);
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/* Update index */
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timeshift_index++;
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return &ts->input;
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}
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