modules/stream_out: select.c

Replace an existing ES with another ES in the same track. It
can be used in combination with VLM. Here is an example vlm command file:

  # VLC media player VLM command batch
  # http://www.videolan.org/vlc/

  # MPEG-TS stream
  new ts broadcast enabled
  setup ts input "file:///<path_to_some_file_to_play>"
  setup ts output #duplicate{dst=bridge-out{id=1},select=video,dst=bridge-out{id=0xa3},select=audio}
  setup ts loop

  # Mic input
  new mic broadcast enabled
  setup mic input "alsa://"
  setup mic output #transcode{acodec=mpga,ab=192,channels=2}:bridge-in{id-offset=0}:select{disable=0}:setid{id=0,newid=0xa3}:autodel:std{access=udp,mux=ts,dst=127.0.0.1:1234}

  # Fire it up
  control ts play
  control mic play

modules/stream_out/Modules.am

@@ -17,6 +17,7 @@ SOURCES_stream_out_raop = raop.c
 SOURCES_stream_out_smem = smem.c
 SOURCES_stream_out_setid = setid.c
 SOURCES_stream_out_langfromtelx = langfromtelx.c
+SOURCES_stream_out_select = select.c
 
 libvlc_LTLIBRARIES += \
 	libstream_out_dummy_plugin.la \
@@ -34,6 +35,7 @@ libvlc_LTLIBRARIES += \
 	libstream_out_smem_plugin.la \
 	libstream_out_setid_plugin.la \
 	libstream_out_langfromtelx_plugin.la \
+	libstream_out_select_plugin.la \
 	$(NULL)
 
 # RTP plugin

modules/stream_out/select.c

+/*****************************************************************************
+ * select.c: Select individual es to enable or disable from stream
+ *****************************************************************************
+ * Copyright (C) 2006-2011 the VideoLAN team
+ * $Id$
+ *
+ * Authors: Jean-Paul Saman <jpsaman@videolan.org>
+ * Based upon autodel.c written by: Christophe Massiot <massiot@via.ecp.fr>
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Preamble
+ *****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <vlc_common.h>
+#include <vlc_plugin.h>
+#include <vlc_sout.h>
+#include <vlc_block.h>
+#include <vlc_network.h>
+
+/*****************************************************************************
+ * Module descriptor
+ *****************************************************************************/
+static int  Open    ( vlc_object_t * );
+static void Close   ( vlc_object_t * );
+
+#define PORT_TEXT N_("Command UDP port")
+#define PORT_LONGTEXT N_( \
+    "UDP port to listen to for commands (show | enable <pid> | disable <pid>)." )
+
+#define DISABLE_TEXT N_("Disable ES id")
+#define DISABLE_LONGTEXT N_( \
+    "Disable ES id at startup." )
+
+#define SOUT_CFG_PREFIX "sout-select-"
+
+vlc_module_begin ()
+    set_shortname(N_("Select"))
+    set_description(N_("Select individual es to enable or disable from stream"))
+    set_capability("sout stream", 50 )
+    add_integer(SOUT_CFG_PREFIX "port", 5001, PORT_TEXT, PORT_LONGTEXT, true)
+    add_integer(SOUT_CFG_PREFIX "disable", -1, DISABLE_TEXT, DISABLE_LONGTEXT, false)
+    add_shortcut("select")
+    set_callbacks(Open, Close)
+vlc_module_end ()
+
+/*****************************************************************************
+ * Local prototypes
+ *****************************************************************************/
+static sout_stream_id_t *Add   (sout_stream_t *, es_format_t *);
+static int               Del   (sout_stream_t *, sout_stream_id_t *);
+static int               Send  (sout_stream_t *, sout_stream_id_t *, block_t *);
+
+static void* Command(vlc_object_t *);
+
+struct sout_stream_id_t
+{
+    sout_stream_id_t *id;
+    es_format_t fmt;
+    bool b_error;
+    bool b_enabled;
+};
+
+struct sout_stream_sys_t
+{
+    sout_stream_id_t **pp_es;
+    int i_es_num;
+
+    vlc_mutex_t es_lock;
+    int i_fd;
+    int i_id_disable;
+};
+
+static const char *const ppsz_sout_options[] = {
+    "disable", "port", NULL
+};
+
+/*****************************************************************************
+ * Open:
+ *****************************************************************************/
+static int Open(vlc_object_t *p_this)
+{
+    sout_stream_t     *p_stream = (sout_stream_t*)p_this;
+    sout_stream_sys_t *p_sys;
+
+    p_sys = malloc(sizeof(sout_stream_sys_t));
+    if (!p_sys)
+        return VLC_ENOMEM;
+
+    if (!p_stream->p_next)
+    {
+        msg_Err( p_stream, "cannot create chain" );
+        free( p_sys );
+        return VLC_EGENERIC;
+    }
+
+    config_ChainParse(p_stream, SOUT_CFG_PREFIX, ppsz_sout_options,
+                      p_stream->p_cfg);
+
+    int port = var_CreateGetInteger(p_stream, SOUT_CFG_PREFIX "port");
+    p_sys->i_fd = net_ListenUDP1(VLC_OBJECT(p_stream), NULL, port);
+    if (p_sys->i_fd < 0)
+    {
+        free( p_sys );
+        return VLC_EGENERIC;
+    }
+    p_sys->i_id_disable = var_CreateGetInteger(p_stream, SOUT_CFG_PREFIX "disable");
+
+    p_sys->pp_es = NULL;
+    p_sys->i_es_num = 0;
+
+    p_stream->pf_add    = Add;
+    p_stream->pf_del    = Del;
+    p_stream->pf_send   = Send;
+
+    p_stream->p_sys     = p_sys;
+
+    vlc_mutex_init(&p_sys->es_lock);
+
+    if (vlc_thread_create(p_stream, Command, VLC_THREAD_PRIORITY_LOW))
+    {
+        vlc_mutex_destroy(&p_sys->es_lock);
+        free(p_sys);
+        return VLC_EGENERIC;
+    }
+
+    /* update p_sout->i_out_pace_nocontrol */
+    p_stream->p_sout->i_out_pace_nocontrol++;
+
+    return VLC_SUCCESS;
+}
+
+/*****************************************************************************
+ * Close:
+ *****************************************************************************/
+static void Close (vlc_object_t * p_this)
+{
+    sout_stream_t     *p_stream = (sout_stream_t*)p_this;
+    sout_stream_sys_t *p_sys = (sout_stream_sys_t *)p_stream->p_sys;
+
+    net_Close( p_sys->i_fd );
+    p_sys->i_fd = -1;
+
+    vlc_thread_join(p_stream);
+
+    vlc_mutex_destroy(&p_sys->es_lock);
+
+    p_stream->p_sout->i_out_pace_nocontrol--;
+
+    free(p_sys);
+}
+
+/****************************************************************************
+ * Command Thread:
+ ****************************************************************************/
+static void* Command(vlc_object_t *p_this)
+{
+    sout_stream_t *p_stream = (sout_stream_t *)p_this;
+    sout_stream_sys_t *p_sys = p_stream->p_sys;
+
+    int canc = vlc_savecancel();
+
+    while (vlc_object_alive(p_stream))
+    {
+        if (p_sys->i_fd < 0)
+            break;
+
+        char psz_buffer[20];
+
+        int i_len = recv(p_sys->i_fd, psz_buffer, sizeof(psz_buffer)-1, 0);
+        if (i_len < 4)
+            continue;
+
+        psz_buffer[i_len] = '\0';
+        msg_Info( p_stream, "command: %s", psz_buffer );
+
+        if (strncmp(psz_buffer, "show", 4) == 0)
+        {
+            vlc_mutex_lock(&p_sys->es_lock);
+            for (int i = 0; i < p_sys->i_es_num; i++)
+            {
+                i_len = snprintf(psz_buffer, sizeof(psz_buffer), "%.4s : %d",
+                                 (char *)&p_sys->pp_es[i]->fmt.i_codec,
+                                 p_sys->pp_es[i]->fmt.i_id);
+                psz_buffer[i_len] = '\0';
+                msg_Info(p_stream, psz_buffer);
+            }
+            vlc_mutex_unlock(&p_sys->es_lock);
+        }
+        else
+        {
+            bool b_apply = false;
+            bool b_select = false;
+            int i_pid = 0x1FFF;
+
+            if (strncmp(psz_buffer, "enable", 6) == 0)
+            {
+                i_pid = atol(psz_buffer+7);
+                b_select = true;
+                b_apply = true;
+            }
+            else if (strncmp(psz_buffer, "disable", 7) == 0)
+            {
+                i_pid = atol(psz_buffer+8);
+                b_apply = true;
+            }
+
+            if (b_apply)
+            {
+                vlc_mutex_lock(&p_sys->es_lock);
+                for (int i = 0; i < p_sys->i_es_num; i++)
+                {
+                    msg_Info(p_stream, "elementary stream pid %d",
+                             p_sys->pp_es[i]->fmt.i_id);
+                    if (p_sys->pp_es[i]->fmt.i_id == i_pid)
+                    {
+                        p_sys->pp_es[i]->b_enabled = b_select;
+                        msg_Info(p_stream, "%s: %d", b_select ? "enable" : "disable", i_pid);
+                    }
+                }
+                vlc_mutex_unlock(&p_sys->es_lock);
+            }
+        }
+    }
+
+    vlc_restorecancel(canc);
+    return NULL;
+}
+
+static sout_stream_id_t *Add(sout_stream_t *p_stream, es_format_t *p_fmt)
+{
+    sout_stream_sys_t *p_sys = (sout_stream_sys_t *)p_stream->p_sys;
+    sout_stream_id_t *p_es = malloc(sizeof(sout_stream_id_t));
+    if( !p_es )
+        return NULL;
+
+    p_es->fmt = *p_fmt;
+    p_es->id = NULL;
+    p_es->b_error = false;
+    p_es->b_enabled = (p_es->fmt.i_id == p_sys->i_id_disable) ? false : true;
+
+    vlc_mutex_lock(&p_sys->es_lock);
+    TAB_APPEND(p_sys->i_es_num, p_sys->pp_es, p_es);
+    vlc_mutex_unlock(&p_sys->es_lock);
+
+    return p_es;
+}
+
+static int Del(sout_stream_t *p_stream, sout_stream_id_t *p_es)
+{
+    sout_stream_sys_t *p_sys = (sout_stream_sys_t *)p_stream->p_sys;
+    sout_stream_id_t *id = p_es->id;
+
+    vlc_mutex_lock(&p_sys->es_lock);
+    TAB_REMOVE(p_sys->i_es_num, p_sys->pp_es, p_es);
+    vlc_mutex_unlock(&p_sys->es_lock);
+
+    free(p_es);
+
+    if (id != NULL)
+        return p_stream->p_next->pf_del(p_stream->p_next, id);
+    else
+        return VLC_SUCCESS;
+}
+
+static int Send(sout_stream_t *p_stream, sout_stream_id_t *p_es,
+                block_t *p_buffer)
+{
+    if (p_es->id == NULL && p_es->b_error != true)
+    {
+        p_es->id = p_stream->p_next->pf_add(p_stream->p_next, &p_es->fmt);
+        if (p_es->id == NULL)
+        {
+            p_es->b_error = true;
+            msg_Err(p_stream, "couldn't create chain for id %d",
+                    p_es->fmt.i_id);
+        }
+    }
+
+    if ((p_es->b_error != true) && p_es->b_enabled)
+        p_stream->p_next->pf_send(p_stream->p_next, p_es->id, p_buffer);
+    else
+        block_ChainRelease(p_buffer);
+
+    return VLC_SUCCESS;
+}