[outputs] Make a wrapper for mp3 streaming so it can be included in

the generic outputs interface and so special handling in player.c can
be removed

src/Makefile.am

@@ -110,7 +110,7 @@ forked_daapd_SOURCES = main.c \
 	outputs.h outputs.c \
 	laudio_dummy.c \
 	laudio.c laudio.h \
-	outputs/raop.c \
+	outputs/raop.c outputs/streaming.c \
 	evrtsp/rtsp.c evrtp/evrtsp.h evrtsp/rtsp-internal.h evrtsp/log.h \
 	$(SPOTIFY_SRC) \
 	$(LASTFM_SRC) \

src/httpd_streaming.c

@@ -52,7 +52,7 @@ extern struct event_base *evbase_httpd;
 // Should prevent that we keep transcoding to dead connections
 #define STREAMING_CONNECTION_TIMEOUT 60
 
-// Linked list of Icecast requests
+// Linked list of mp3 streaming requests
 struct streaming_session {
   struct evhttp_request *req;
   struct streaming_session *next;
@@ -108,7 +108,6 @@ streaming_fail_cb(struct evhttp_connection *evcon, void *arg)
     {
       DPRINTF(E_INFO, L_STREAMING, "No more clients, will stop streaming\n");
       event_del(streamingev);
-      player_streaming_stop();
     }
 }
 
@@ -122,16 +121,16 @@ streaming_send_cb(evutil_socket_t fd, short event, void *arg)
   int len;
   int ret;
 
-  if (!streaming_sessions)
-    return;
-
-  // Callback from player (EV_READ)
+  // Player wrote data to the pipe (EV_READ)
   if (event & EV_READ)
     {
       ret = read(streaming_pipe[0], &streaming_rawbuf, STREAMING_RAWBUF_SIZE);
       if (ret < 0)
 	return;
 
+      if (!streaming_sessions)
+	return;
+
       decoded = transcode_raw2frame(streaming_rawbuf, STREAMING_RAWBUF_SIZE);
       if (!decoded)
 	{
@@ -153,6 +152,9 @@ streaming_send_cb(evutil_socket_t fd, short event, void *arg)
 	  player_get_status(&streaming_player_status);
 	}
 
+      if (!streaming_sessions)
+	return;
+
       if (streaming_player_status.status != PLAY_PAUSED)
 	return;
 
@@ -177,22 +179,6 @@ streaming_send_cb(evutil_socket_t fd, short event, void *arg)
   evbuffer_free(evbuf);
 }
 
-// Thread: player
-static int
-streaming_cb(uint8_t *rawbuf, size_t size)
-{
-  if (size != STREAMING_RAWBUF_SIZE)
-    {
-      DPRINTF(E_LOG, L_STREAMING, "Bug! Buffer size in streaming_cb does not equal input from player\n");
-      return -1;
-    }
-
-  if (write(streaming_pipe[1], rawbuf, size) < 0)
-    return -1;
-
-  return 0;
-}
-
 // Thread: player (not fully thread safe, but hey...)
 static void
 player_change_cb(enum listener_event_type type)
@@ -200,6 +186,20 @@ player_change_cb(enum listener_event_type type)
   streaming_player_changed = 1;
 }
 
+// Thread: player (also prone to race conditions, mostly during deinit)
+void
+streaming_write(uint8_t *buf, uint64_t rtptime)
+{
+  int ret;
+
+  if (!streaming_sessions)
+    return;
+
+  ret = write(streaming_pipe[1], buf, STREAMING_RAWBUF_SIZE);
+  if (ret < 0)
+    DPRINTF(E_LOG, L_STREAMING, "Error writing to streaming pipe\n");
+}
+
 int
 streaming_is_request(struct evhttp_request *req, char *uri)
 {
@@ -269,8 +269,6 @@ streaming_request(struct evhttp_request *req)
   evhttp_connection_set_timeout(evcon, STREAMING_CONNECTION_TIMEOUT);
   evhttp_connection_set_closecb(evcon, streaming_fail_cb, session);
 
-  player_streaming_start(streaming_cb);
-
   return 0;
 }
 
@@ -403,18 +401,20 @@ streaming_deinit(void)
   if (!streaming_initialized)
     return;
 
-  player_streaming_stop();
-
-  event_free(streamingev);
+  session = streaming_sessions;
+  streaming_sessions = NULL; // Stops writing and sending
 
   next = NULL;
-  for (session = streaming_sessions; session; session = next)
+  while (session)
     {
       evhttp_send_reply_end(session->req);
       next = session->next;
       free(session);
+      session = next;
     }
 
+  event_free(streamingev);
+
   listener_remove(player_change_cb);
 
   close(streaming_pipe[0]);

src/httpd_streaming.h

@@ -10,6 +10,9 @@
  * if a suitable ffmpeg/libav encoder is not present at runtime.
  */
 
+void
+streaming_write(uint8_t *buf, uint64_t rtptime);
+
 int
 streaming_is_request(struct evhttp_request *req, char *uri);
 

src/outputs.c

@@ -35,8 +35,8 @@ extern struct output_definition output_raop;
 #ifdef CHROMECAST
 extern struct output_definition output_cast;
 #endif
-/* TODO
 extern struct output_definition output_streaming;
+/* TODO
 #ifdef ALSA
 extern struct output_definition output_alsa;
 #endif
@@ -52,8 +52,8 @@ static struct output_definition *outputs[] = {
 #ifdef CHROMECAST
     &output_cast,
 #endif
-/* TODO
     &output_streaming,
+/* TODO
 #ifdef ALSA
     &output_alsa,
 #endif
@@ -338,6 +338,9 @@ outputs_init(void)
 	  return -1;
 	}
 
+      if (!outputs[i]->init)
+	continue;
+
       ret = outputs[i]->init();
       if (ret < 0)
 	outputs[i]->disabled = 1;
@@ -358,7 +361,10 @@ outputs_deinit(void)
 
   for (i = 0; outputs[i]; i++)
     {
-      if (!outputs[i]->disabled)
+      if (outputs[i]->disabled)
+	continue;
+
+      if (outputs[i]->deinit)
         outputs[i]->deinit();
     }
 }

src/outputs.h

@@ -23,8 +23,8 @@ enum output_types
 #ifdef CHROMECAST
   OUTPUT_TYPE_CAST,
 #endif
-/* TODO
   OUTPUT_TYPE_STREAMING,
+/* TODO
   OUTPUT_TYPE_ALSA,
   OUTPUT_TYPE_OSS,
   OUTPUT_TYPE_DUMMY,

src/outputs/streaming.c

@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2016 Espen Jürgensen <espenjurgensen@gmail.com>
+ *
+ * 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  02111-1307  USA
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdint.h>
+
+#include "outputs.h"
+#include "httpd_streaming.h"
+
+
+struct output_definition output_streaming =
+{
+  .name = "mp3 streaming",
+  .type = OUTPUT_TYPE_STREAMING,
+  .priority = 0,
+  .disabled = 0,
+  .write = streaming_write,
+};

src/player.c

@@ -291,9 +291,6 @@ static int laudio_selected;
 static int laudio_volume;
 static int laudio_relvol;
 static int output_sessions;
-static int streaming_selected;
-
-static player_streaming_cb streaming_write;
 
 /* Commands */
 static struct player_command *cur_cmd;
@@ -1606,14 +1603,10 @@ playback_write(void)
       return;
     }
 
-  if (streaming_selected)
-    streaming_write(rawbuf, sizeof(rawbuf));
-
   if (laudio_status & LAUDIO_F_STARTED)
     laudio_write(rawbuf, last_rtptime);
 
-  if (output_sessions > 0)
-    outputs_write(rawbuf, last_rtptime);
+  outputs_write(rawbuf, last_rtptime);
 }
 
 static void
@@ -2170,8 +2163,7 @@ playback_abort(void)
   if (laudio_status != LAUDIO_CLOSED)
     laudio_close();
 
-  if (output_sessions > 0)
-    outputs_playback_stop();
+  outputs_playback_stop();
 
   pb_timer_stop();
 
@@ -2423,8 +2415,7 @@ playback_start_bh(struct player_command *cmd)
     goto out_fail;
 
   /* Everything OK, start outputs */
-  if (output_sessions > 0)
-    outputs_playback_start(last_rtptime + AIRTUNES_V2_PACKET_SAMPLES, &pb_pos_stamp);
+  outputs_playback_start(last_rtptime + AIRTUNES_V2_PACKET_SAMPLES, &pb_pos_stamp);
 
   status_update(PLAY_PLAYING);
 
@@ -4014,19 +4005,6 @@ player_playback_prev(void)
   return ret;
 }
 
-void
-player_streaming_start(player_streaming_cb cb)
-{
-  streaming_write = cb;
-  streaming_selected = 1;
-}
-
-void
-player_streaming_stop(void)
-{
-  streaming_selected = 0;
-}
-
 
 void
 player_speaker_enumerate(spk_enum_cb cb, void *arg)

src/player.h

@@ -70,7 +70,6 @@ struct player_status {
 };
 
 typedef void (*spk_enum_cb)(uint64_t id, const char *name, int relvol, struct spk_flags flags, void *arg);
-typedef int (*player_streaming_cb)(uint8_t *rawbuf, size_t size);
 
 struct player_history
 {
@@ -131,12 +130,6 @@ player_playback_next(void);
 int
 player_playback_prev(void);
 
-void
-player_streaming_start(player_streaming_cb cb);
-
-void
-player_streaming_stop(void);
-
 
 int
 player_volume_set(int vol);