예제 #1
0
/*!
 * The first call to the video code, called by oss_new() or similar.
 * Here we initialize the various components we use, namely SDL for display,
 * ffmpeg for encoding/decoding, and a local video source.
 * We do our best to progress even if some of the components are not
 * available.
 */
void console_video_start(struct video_desc *env, struct ast_channel *owner)
{
	ast_log(LOG_WARNING, "env %p chan %p\n", env, owner);
	if (env == NULL)	/* video not initialized */
		return;
	env->owner = owner;	/* work even if no owner is specified */
	if (env->vthread)
		return;		/* already initialized, nothing to do */
	init_env(env);
	env->out.enc = map_config_video_format(env->codec_name);

	ast_log(LOG_WARNING, "start video out %s %dx%d\n",
		env->codec_name, env->enc_in.w,  env->enc_in.h);
	/*
	 * Register all codecs supported by the ffmpeg library.
	 * We only need to do it once, but probably doesn't
	 * harm to do it multiple times.
	 */
	avcodec_init();
	avcodec_register_all();
	av_log_set_level(AV_LOG_ERROR);	/* only report errors */

	if (env->out.fps == 0) {
		env->out.fps = 15;
		ast_log(LOG_WARNING, "fps unset, forcing to %d\n", env->out.fps);
	}
	if (env->out.bitrate == 0) {
		env->out.bitrate = 65000;
		ast_log(LOG_WARNING, "bitrate unset, forcing to %d\n", env->out.bitrate);
	}
	/* create the thread as detached so memory is freed on termination */
	ast_pthread_create_detached_background(&env->vthread,
		NULL, video_thread, env);
}
예제 #2
0
int ooh323c_start_call_thread(ooCallData *call) {
 char c = 'c';
 struct callthread *cur = callThreads;

 ast_mutex_lock(&callThreadsLock);
 while (cur != NULL && (cur->inUse || ast_mutex_trylock(&cur->lock))) {
	cur = cur->next;
 }
 ast_mutex_unlock(&callThreadsLock);

 if (cur != NULL) {
   if (cur->inUse || write(cur->thePipe[1], &c, 1) < 0) {
	ast_mutex_unlock(&cur->lock);
	cur = NULL;
   }
 }

/* make new thread */
 if (cur == NULL) {
	if (!(cur = ast_calloc(1, sizeof(struct callthread)))) {
		ast_log(LOG_ERROR, "Unable to allocate thread structure for call %s\n",
							call->callToken);
		return -1;
	}

	ast_module_ref(myself);
	if ((socketpair(PF_LOCAL, SOCK_STREAM, 0, cur->thePipe)) == -1) {
		ast_log(LOG_ERROR, "Can't create thread pipe for call %s\n", call->callToken);
		ast_free(cur);
		return -1;
	}
	cur->inUse = TRUE;
	cur->call = call;

	ast_mutex_init(&cur->lock);

	if (gH323Debug)
		ast_debug(1,"new call thread created for call %s\n", call->callToken);

	if(ast_pthread_create_detached_background(&call->callThread, NULL, ooh323c_call_thread, cur) < 0)
 	{
  		ast_log(LOG_ERROR, "Unable to start ooh323c call thread for call %s\n",
					call->callToken);
		ast_mutex_destroy(&cur->lock);
		close(cur->thePipe[0]);
		close(cur->thePipe[1]);
		ast_free(cur);
  		return -1;
 	}

 } else {
	if (gH323Debug)
		ast_debug(1,"using existing call thread for call %s\n", call->callToken);
	cur->inUse = TRUE;
	cur->call = call;
	ast_mutex_unlock(&cur->lock);

 }
 return 0;
}
예제 #3
0
파일: tcptls.c 프로젝트: litnimax/asterisk
void *ast_tcptls_server_root(void *data)
{
    struct ast_tcptls_session_args *desc = data;
    int fd;
    struct ast_sockaddr addr;
    struct ast_tcptls_session_instance *tcptls_session;
    pthread_t launched;

    for (;;) {
        int i, flags;

        if (desc->periodic_fn) {
            desc->periodic_fn(desc);
        }
        i = ast_wait_for_input(desc->accept_fd, desc->poll_timeout);
        if (i <= 0) {
            continue;
        }
        fd = ast_accept(desc->accept_fd, &addr);
        if (fd < 0) {
            if ((errno != EAGAIN) && (errno != EWOULDBLOCK) && (errno != EINTR) && (errno != ECONNABORTED)) {
                ast_log(LOG_ERROR, "Accept failed: %s\n", strerror(errno));
                break;
            }
            continue;
        }
        tcptls_session = ao2_alloc(sizeof(*tcptls_session), session_instance_destructor);
        if (!tcptls_session) {
            ast_log(LOG_WARNING, "No memory for new session: %s\n", strerror(errno));
            if (close(fd)) {
                ast_log(LOG_ERROR, "close() failed: %s\n", strerror(errno));
            }
            continue;
        }

        tcptls_session->overflow_buf = ast_str_create(128);
        flags = fcntl(fd, F_GETFL);
        fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);

        tcptls_session->stream = ast_iostream_from_fd(&fd);
        if (!tcptls_session->stream) {
            ast_log(LOG_WARNING, "No memory for new session iostream\n");
            continue;
        }

        tcptls_session->parent = desc;
        ast_sockaddr_copy(&tcptls_session->remote_address, &addr);

        tcptls_session->client = 0;

        /* This thread is now the only place that controls the single ref to tcptls_session */
        if (ast_pthread_create_detached_background(&launched, NULL, handle_tcptls_connection, tcptls_session)) {
            ast_log(LOG_ERROR, "Unable to launch helper thread: %s\n", strerror(errno));
            ast_tcptls_close_session_file(tcptls_session);
            ao2_ref(tcptls_session, -1);
        }
    }
    return NULL;
}
예제 #4
0
void *ast_tcptls_server_root(void *data)
{
	struct ast_tcptls_session_args *desc = data;
	int fd;
	struct sockaddr_in sin;
	socklen_t sinlen;
	struct ast_tcptls_session_instance *tcptls_session;
	pthread_t launched;
	
	for (;;) {
		int i, flags;

		if (desc->periodic_fn)
			desc->periodic_fn(desc);
		i = ast_wait_for_input(desc->accept_fd, desc->poll_timeout);
		if (i <= 0)
			continue;
		sinlen = sizeof(sin);
		fd = accept(desc->accept_fd, (struct sockaddr *) &sin, &sinlen);
		if (fd < 0) {
			if ((errno != EAGAIN) && (errno != EINTR))
				ast_log(LOG_WARNING, "Accept failed: %s\n", strerror(errno));
			continue;
		}
		tcptls_session = ao2_alloc(sizeof(*tcptls_session), session_instance_destructor);
		if (!tcptls_session) {
			ast_log(LOG_WARNING, "No memory for new session: %s\n", strerror(errno));
			close(fd);
			continue;
		}

		ast_mutex_init(&tcptls_session->lock);

		flags = fcntl(fd, F_GETFL);
		fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
		tcptls_session->fd = fd;
		tcptls_session->parent = desc;
		memcpy(&tcptls_session->remote_address, &sin, sizeof(tcptls_session->remote_address));

		tcptls_session->client = 0;
			
		/* This thread is now the only place that controls the single ref to tcptls_session */
		if (ast_pthread_create_detached_background(&launched, NULL, handle_tcptls_connection, tcptls_session)) {
			ast_log(LOG_WARNING, "Unable to launch helper thread: %s\n", strerror(errno));
			close(tcptls_session->fd);
			ao2_ref(tcptls_session, -1);
		}
	}
	return NULL;
}
예제 #5
0
static void *hook_launch_thread(void *data)
{
	struct hook_thread_arg *arg = data;
	struct ast_variable hook_id = {
		.name = "HOOK_ID",
		.value = arg->hook_id,
	};
	struct ast_variable chan_name_var = {
		.name = "HOOK_CHANNEL",
		.value = arg->chan_name,
		.next = &hook_id,
	};

	ast_pbx_outgoing_exten("Local", NULL, full_exten_name, 60,
			arg->context, arg->exten, 1, NULL, AST_OUTGOING_NO_WAIT,
			NULL, NULL, &chan_name_var, NULL, NULL, 1, NULL);

	hook_thread_arg_destroy(arg);

	return NULL;
}

static struct hook_thread_arg *hook_thread_arg_alloc(struct ast_channel *chan,
		struct hook_state *state)
{
	struct hook_thread_arg *arg;

	if (!(arg = ast_calloc(1, sizeof(*arg)))) {
		return NULL;
	}

	ast_channel_lock(chan);
	arg->chan_name = ast_strdup(ast_channel_name(chan));
	ast_channel_unlock(chan);
	if (!arg->chan_name) {
		hook_thread_arg_destroy(arg);
		return NULL;
	}

	if (ast_asprintf(&arg->hook_id, "%u", state->hook_id) == -1) {
		hook_thread_arg_destroy(arg);
		return NULL;
	}

	if (!(arg->context = ast_strdup(state->context))) {
		hook_thread_arg_destroy(arg);
		return NULL;
	}

	if (!(arg->exten = ast_strdup(state->exten))) {
		hook_thread_arg_destroy(arg);
		return NULL;
	}

	return arg;
}

static int do_hook(struct ast_channel *chan, struct hook_state *state)
{
	pthread_t t;
	struct hook_thread_arg *arg;
	int res;

	if (!(arg = hook_thread_arg_alloc(chan, state))) {
		return -1;
	}

	/*
	 * We don't want to block normal frame processing *at all* while we kick
	 * this off, so do it in a new thread.
	 */
	res = ast_pthread_create_detached_background(&t, NULL, hook_launch_thread, arg);
	if (res != 0) {
		hook_thread_arg_destroy(arg);
	}

	return res;
}

static int hook_callback(struct ast_audiohook *audiohook, struct ast_channel *chan,
		struct ast_frame *frame, enum ast_audiohook_direction direction)
{
	struct hook_state *state = (struct hook_state *) audiohook; /* trust me. */
	struct timeval now;
	int res = 0;

	if (audiohook->status == AST_AUDIOHOOK_STATUS_DONE || state->disabled) {
		return 0;
	}

	now = ast_tvnow();
	if (ast_tvdiff_ms(now, state->last_hook) > state->interval * 1000) {
		if ((res = do_hook(chan, state))) {
			const char *name;
			ast_channel_lock(chan);
			name = ast_strdupa(ast_channel_name(chan));
			ast_channel_unlock(chan);
			ast_log(LOG_WARNING, "Failed to run hook on '%s'\n", name);
		}
		state->last_hook = now;
	}

	return res;
}

static struct hook_state *hook_state_alloc(const char *context, const char *exten,
		unsigned int interval, unsigned int hook_id)
{
	struct hook_state *state;

	if (!(state = ast_calloc(1, sizeof(*state)))) {
		return NULL;
	}

	state->context = ast_strdup(context);
	state->exten = ast_strdup(exten);
	state->interval = interval;
	state->hook_id = hook_id;

	ast_audiohook_init(&state->audiohook, AST_AUDIOHOOK_TYPE_MANIPULATE,
			AST_MODULE, AST_AUDIOHOOK_MANIPULATE_ALL_RATES);
	state->audiohook.manipulate_callback = hook_callback;

	return state;
}

static int init_hook(struct ast_channel *chan, const char *context, const char *exten,
		unsigned int interval, unsigned int hook_id)
{
	struct hook_state *state;
	struct ast_datastore *datastore;
	char uid[32];

	snprintf(uid, sizeof(uid), "%u", hook_id);

	if (!(datastore = ast_datastore_alloc(&hook_datastore, uid))) {
		return -1;
	}
	ast_module_ref(ast_module_info->self);
	if (!(state = hook_state_alloc(context, exten, interval, hook_id))) {
		ast_datastore_free(datastore);
		return -1;
	}
	datastore->data = state;

	ast_channel_lock(chan);
	ast_channel_datastore_add(chan, datastore);
	ast_audiohook_attach(chan, &state->audiohook);
	ast_channel_unlock(chan);

	return 0;
}

static int hook_on(struct ast_channel *chan, const char *data, unsigned int hook_id)
{
	char *parse = ast_strdupa(S_OR(data, ""));
	AST_DECLARE_APP_ARGS(args,
		AST_APP_ARG(context);
		AST_APP_ARG(exten);
		AST_APP_ARG(interval);
	);
예제 #6
0
static void launch_monitor_thread(struct ast_channel *chan, const char *filename,
				  unsigned int flags, int readvol, int writevol,
				  const char *post_process, const char *filename_write,
				  char *filename_read, const char *uid_channel_var)
{
	pthread_t thread;
	struct mixmonitor *mixmonitor;
	char postprocess2[1024] = "";
	char *datastore_id = NULL;

	postprocess2[0] = 0;
	/* If a post process system command is given attach it to the structure */
	if (!ast_strlen_zero(post_process)) {
		char *p1, *p2;

		p1 = ast_strdupa(post_process);
		for (p2 = p1; *p2; p2++) {
			if (*p2 == '^' && *(p2+1) == '{') {
				*p2 = '$';
			}
		}
		pbx_substitute_variables_helper(chan, p1, postprocess2, sizeof(postprocess2) - 1);
	}

	/* Pre-allocate mixmonitor structure and spy */
	if (!(mixmonitor = ast_calloc(1, sizeof(*mixmonitor)))) {
		return;
	}

	/* Setup the actual spy before creating our thread */
	if (ast_audiohook_init(&mixmonitor->audiohook, AST_AUDIOHOOK_TYPE_SPY, mixmonitor_spy_type, 0)) {
		mixmonitor_free(mixmonitor);
		return;
	}

	/* Copy over flags and channel name */
	mixmonitor->flags = flags;
	if (!(mixmonitor->autochan = ast_autochan_setup(chan))) {
		mixmonitor_free(mixmonitor);
		return;
	}

	if (setup_mixmonitor_ds(mixmonitor, chan, &datastore_id)) {
		ast_autochan_destroy(mixmonitor->autochan);
		mixmonitor_free(mixmonitor);
		ast_free(datastore_id);
		return;
	}

	if (!ast_strlen_zero(uid_channel_var)) {
		if (datastore_id) {
			pbx_builtin_setvar_helper(chan, uid_channel_var, datastore_id);
		}
	}
	ast_free(datastore_id);


	mixmonitor->name = ast_strdup(ast_channel_name(chan));

	if (!ast_strlen_zero(postprocess2)) {
		mixmonitor->post_process = ast_strdup(postprocess2);
	}

	if (!ast_strlen_zero(filename)) {
		mixmonitor->filename = ast_strdup(filename);
	}

	if (!ast_strlen_zero(filename_write)) {
		mixmonitor->filename_write = ast_strdup(filename_write);
	}

	if (!ast_strlen_zero(filename_read)) {
		mixmonitor->filename_read = ast_strdup(filename_read);
	}

	ast_set_flag(&mixmonitor->audiohook, AST_AUDIOHOOK_TRIGGER_SYNC);

	if (readvol)
		mixmonitor->audiohook.options.read_volume = readvol;
	if (writevol)
		mixmonitor->audiohook.options.write_volume = writevol;

	if (startmon(chan, &mixmonitor->audiohook)) {
		ast_log(LOG_WARNING, "Unable to add '%s' spy to channel '%s'\n",
			mixmonitor_spy_type, ast_channel_name(chan));
		ast_audiohook_destroy(&mixmonitor->audiohook);
		mixmonitor_free(mixmonitor);
		return;
	}

	ast_pthread_create_detached_background(&thread, NULL, mixmonitor_thread, mixmonitor);
}
예제 #7
0
struct ast_channel *stasis_app_control_snoop(struct ast_channel *chan,
	enum stasis_app_snoop_direction spy, enum stasis_app_snoop_direction whisper,
	const char *app, const char *app_args, const char *snoop_id)
{
	RAII_VAR(struct stasis_app_snoop *, snoop, NULL, ao2_cleanup);
	struct ast_format_cap *caps;
	pthread_t thread;
	struct ast_assigned_ids assignedids = {
		.uniqueid = snoop_id,
	};

	if (spy == STASIS_SNOOP_DIRECTION_NONE &&
		whisper == STASIS_SNOOP_DIRECTION_NONE) {
		return NULL;
	}

	snoop = ao2_alloc_options(sizeof(*snoop), snoop_destroy, AO2_ALLOC_OPT_LOCK_NOLOCK);
	if (!snoop) {
		return NULL;
	}

	/* Allocate a buffer to store the Stasis application and arguments in */
	snoop->app = ast_str_create(64);
	if (!snoop->app) {
		return NULL;
	}

	ast_str_set(&snoop->app, 0, "%s", app);
	if (!ast_strlen_zero(app_args)) {
		ast_str_append(&snoop->app, 0, ",%s", app_args);
	}

	/* Set up a timer for the Snoop channel so it wakes up at a specific interval */
	snoop->timer = ast_timer_open();
	if (!snoop->timer) {
		return NULL;
	}
	ast_timer_set_rate(snoop->timer, 1000 / SNOOP_INTERVAL);

	/* Determine which signed linear format should be used */
	snoop_determine_format(chan, snoop);

	/* Allocate a Snoop channel and set up various parameters */
	snoop->chan = ast_channel_alloc(1, AST_STATE_UP, "", "", "", "", "", &assignedids, NULL, 0, "Snoop/%s-%08x", ast_channel_uniqueid(chan),
		(unsigned)ast_atomic_fetchadd_int((int *)&chan_idx, +1));
	if (!snoop->chan) {
		return NULL;
	}

	ast_copy_string(snoop->uniqueid, ast_channel_uniqueid(chan), sizeof(snoop->uniqueid));

	/* To keep the channel valid on the Snoop structure until it is destroyed we bump the ref up here */
	ast_channel_ref(snoop->chan);

	ast_channel_tech_set(snoop->chan, &snoop_tech);
	ao2_ref(snoop, +1);
	ast_channel_tech_pvt_set(snoop->chan, snoop);
	ast_channel_set_fd(snoop->chan, 0, ast_timer_fd(snoop->timer));

	/* The format on the Snoop channel will be this signed linear format, and it will never change */
	caps = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT);
	if (!caps) {
		ast_channel_unlock(snoop->chan);
		ast_hangup(snoop->chan);
		return NULL;
	}
	ast_format_cap_append(caps, snoop->spy_format, 0);
	ast_channel_nativeformats_set(snoop->chan, caps);
	ao2_ref(caps, -1);

	ast_channel_set_writeformat(snoop->chan, snoop->spy_format);
	ast_channel_set_rawwriteformat(snoop->chan, snoop->spy_format);
	ast_channel_set_readformat(snoop->chan, snoop->spy_format);
	ast_channel_set_rawreadformat(snoop->chan, snoop->spy_format);

	ast_channel_unlock(snoop->chan);

	if (spy != STASIS_SNOOP_DIRECTION_NONE) {
		if (snoop_setup_audiohook(chan, AST_AUDIOHOOK_TYPE_SPY, spy, &snoop->spy_direction, &snoop->spy)) {
			ast_hangup(snoop->chan);
			return NULL;
		}

		snoop->spy_samples = ast_format_get_sample_rate(snoop->spy_format) / (1000 / SNOOP_INTERVAL);
		snoop->spy_active = 1;
	}

	/* If whispering is enabled set up the audiohook */
	if (whisper != STASIS_SNOOP_DIRECTION_NONE) {
		if (snoop_setup_audiohook(chan, AST_AUDIOHOOK_TYPE_WHISPER, whisper, &snoop->whisper_direction, &snoop->whisper)) {
			ast_hangup(snoop->chan);
			return NULL;
		}

		snoop->whisper_active = 1;
	}

	/* Create the thread which services the Snoop channel */
	ao2_ref(snoop, +1);
	if (ast_pthread_create_detached_background(&thread, NULL, snoop_stasis_thread, snoop)) {
		ao2_cleanup(snoop);

		/* No other thread is servicing this channel so we can immediately hang it up */
		ast_hangup(snoop->chan);
		return NULL;
	}

	publish_chanspy_message(snoop, 1);

	/* The caller of this has a reference as well */
	return ast_channel_ref(snoop->chan);
}
예제 #8
0
/*
 * Helper thread to periodically poll the video sources and enqueue the
 * generated frames directed to the remote party to the channel's queue.
 * Using a separate thread also helps because the encoding can be
 * computationally expensive so we don't want to starve the main thread.
 */
static void *video_thread(void *arg)
{
	struct video_desc *env = arg;
	int count = 0;
	char save_display[128] = "";
	int i; /* integer variable used as iterator */

	/* if sdl_videodriver is set, override the environment. Also,
	 * if it contains 'console' override DISPLAY around the call to SDL_Init
	 * so we use the console as opposed to the x11 version of aalib
	 */
	if (!ast_strlen_zero(env->sdl_videodriver)) { /* override */
		const char *s = getenv("DISPLAY");
		setenv("SDL_VIDEODRIVER", env->sdl_videodriver, 1);
		if (s && !strcasecmp(env->sdl_videodriver, "aalib-console")) {
			ast_copy_string(save_display, s, sizeof(save_display));
			unsetenv("DISPLAY");
		}
	}
	sdl_setup(env);
	if (!ast_strlen_zero(save_display)) {
		setenv("DISPLAY", save_display, 1);
	}

	ast_mutex_init(&env->dec_lock);	/* used to sync decoder and renderer */

	if (grabber_open(&env->out)) {
		ast_log(LOG_WARNING, "cannot open local video source\n");
	}

	if (env->out.device_num) {
		env->out.devices[env->out.device_primary].status_index |= IS_PRIMARY | IS_SECONDARY;
	}

	/* even if no device is connected, we must call video_out_init,
	 * as some of the data structures it initializes are
	 * used in get_video_frames()
	 */
	video_out_init(env);

	/* Writes intial status of the sources. */
	if (env->gui) {
		for (i = 0; i < env->out.device_num; i++) {
			print_message(env->gui->thumb_bd_array[i].board,
				src_msgs[env->out.devices[i].status_index]);
		}
	}

	for (;;) {
		struct timespec t = { 0, 50000000 };	/* XXX 20 times/sec */
		struct ast_frame *p, *f;
		struct ast_channel *chan;
		int fd;
		char *caption = NULL, buf[160];

		/* determine if video format changed */
		if (count++ % 10 == 0) {
			if (env->out.sendvideo && env->out.devices) {
				snprintf(buf, sizeof(buf), "%s %s %dx%d @@ %dfps %dkbps",
				env->out.devices[env->out.device_primary].name, env->codec_name,
				env->enc_in.w, env->enc_in.h,
				env->out.fps, env->out.bitrate / 1000);
			} else {
				sprintf(buf, "hold");
			}
			caption = buf;
		}

		/* manage keypad events */
		/* XXX here we should always check for events,
		* otherwise the drag will not work */ 
		if (env->gui)
			eventhandler(env, caption);

		/* sleep for a while */
		nanosleep(&t, NULL);

	    if (env->in) {
			struct video_dec_desc *v = env->in;

			/*
			 * While there is something to display, call the decoder and free
			 * the buffer, possibly enabling the receiver to store new data.
			 */
			while (v->dec_in_dpy) {
				struct fbuf_t *tmp = v->dec_in_dpy;	/* store current pointer */

				/* decode the frame, but show it only if not frozen */
				if (v->d_callbacks->dec_run(v, tmp) && !env->frame_freeze)
					show_frame(env, WIN_REMOTE);
				tmp->used = 0;	/* mark buffer as free */
				tmp->ebit = 0;
				ast_mutex_lock(&env->dec_lock);
				if (++v->dec_in_dpy == &v->dec_in[N_DEC_IN])	/* advance to next, circular */
					v->dec_in_dpy = &v->dec_in[0];

				if (v->dec_in_cur == NULL)	/* receiver was idle, enable it... */
					v->dec_in_cur = tmp;	/* using the slot just freed */
				else if (v->dec_in_dpy == v->dec_in_cur) /* this was the last slot */
					v->dec_in_dpy = NULL;	/* nothing more to display */
				ast_mutex_unlock(&env->dec_lock);
			}
		}

		if (env->shutdown)
			break;
		f = get_video_frames(env, &p);	/* read and display */
		if (!f)
			continue;
		chan = env->owner;
		if (chan == NULL) {
			/* drop the chain of frames, nobody uses them */
			while (f) {
				struct ast_frame *g = AST_LIST_NEXT(f, frame_list);
				ast_frfree(f);
				f = g;
			}
			continue;
		}
		ast_channel_lock(chan);

		/* AST_LIST_INSERT_TAIL is only good for one frame, cannot use here */
		if (ast_channel_readq(chan).first == NULL) {
			ast_channel_readq(chan).first = f;
		} else {
			ast_channel_readq(chan).last->frame_list.next = f;
		}
		ast_channel_readq(chan).last = p;
		/*
		 * more or less same as ast_queue_frame, but extra
		 * write on the alertpipe to signal frames.
		 */
		if (ast_channel_alertable(chan)) {
			for (p = f; p; p = AST_LIST_NEXT(p, frame_list)) {
				if (ast_channel_alert(chan)) {
					ast_log(LOG_WARNING, "Unable to write to alert pipe on %s, frametype/subclass %d/%d: %s!\n",
						ast_channel_name(chan), f->frametype, f->subclass, strerror(errno));
			}
		}
		ast_channel_unlock(chan);
	}
	/* thread terminating, here could call the uninit */
	/* uninitialize the local and remote video environments */
	env->in = dec_uninit(env->in);
	video_out_uninit(env);

	if (env->gui)
		env->gui = cleanup_sdl(env->gui, env->out.device_num);
	ast_mutex_destroy(&env->dec_lock);
	env->shutdown = 0;
	return NULL;
}

static void copy_geometry(struct fbuf_t *src, struct fbuf_t *dst)
{
	if (dst->w == 0)
		dst->w = src->w;
	if (dst->h == 0)
		dst->h = src->h;
}

/*! initialize the video environment.
 * Apart from the formats (constant) used by sdl and the codec,
 * we use enc_in as the basic geometry.
 */
static void init_env(struct video_desc *env)
{
	struct fbuf_t *c = &(env->out.loc_src_geometry);		/* local source */
	struct fbuf_t *ei = &(env->enc_in);		/* encoder input */
	struct fbuf_t *ld = &(env->loc_dpy);	/* local display */
	struct fbuf_t *rd = &(env->rem_dpy);		/* remote display */
	int i; /* integer working as iterator */

	c->pix_fmt = PIX_FMT_YUV420P;	/* default - camera format */
	ei->pix_fmt = PIX_FMT_YUV420P;	/* encoder input */
	if (ei->w == 0 || ei->h == 0) {
		ei->w = 352;
		ei->h = 288;
	}
	ld->pix_fmt = rd->pix_fmt = PIX_FMT_YUV420P; /* sdl format */
	/* inherit defaults */
	copy_geometry(ei, c);	/* camera inherits from encoder input */
	copy_geometry(ei, rd);	/* remote display inherits from encoder input */
	copy_geometry(rd, ld);	/* local display inherits from remote display */

	/* fix the size of buffers for small windows */
	for (i = 0; i < env->out.device_num; i++) {
		env->src_dpy[i].pix_fmt = PIX_FMT_YUV420P;
		env->src_dpy[i].w = SRC_WIN_W;
		env->src_dpy[i].h = SRC_WIN_H;
	}
	/* now we set the default coordinates for the picture in picture
	frames inside the env_in buffers, those can be changed by dragging the
	picture in picture with left click */
	env->out.pip_x = ei->w - ei->w/3;
	env->out.pip_y = ei->h - ei->h/3;
}

/*!
 * The first call to the video code, called by oss_new() or similar.
 * Here we initialize the various components we use, namely SDL for display,
 * ffmpeg for encoding/decoding, and a local video source.
 * We do our best to progress even if some of the components are not
 * available.
 */
void console_video_start(struct video_desc *env, struct ast_channel *owner)
{
	ast_log(LOG_WARNING, "env %p chan %p\n", env, owner);
	if (env == NULL)	/* video not initialized */
		return;
	env->owner = owner;	/* work even if no owner is specified */
	if (env->vthread)
		return;		/* already initialized, nothing to do */
	init_env(env);
	env->out.enc = map_config_video_format(env->codec_name);

	ast_log(LOG_WARNING, "start video out %s %dx%d\n",
		env->codec_name, env->enc_in.w,  env->enc_in.h);
	/*
	 * Register all codecs supported by the ffmpeg library.
	 * We only need to do it once, but probably doesn't
	 * harm to do it multiple times.
	 */
	avcodec_init();
	avcodec_register_all();
	av_log_set_level(AV_LOG_ERROR);	/* only report errors */

	if (env->out.fps == 0) {
		env->out.fps = 15;
		ast_log(LOG_WARNING, "fps unset, forcing to %d\n", env->out.fps);
	}
	if (env->out.bitrate == 0) {
		env->out.bitrate = 65000;
		ast_log(LOG_WARNING, "bitrate unset, forcing to %d\n", env->out.bitrate);
	}
	/* create the thread as detached so memory is freed on termination */
	ast_pthread_create_detached_background(&env->vthread,
		NULL, video_thread, env);
}