[misc/player] Introduce output ability to announce supported formats

Also introduce default output format and selected device format, should the
user want another format.

As part of this, change enum player_format in player.h to enum media_format in
misc.h so that it is akin to struct media_quality.

Modify json API to support this.

src/outputs/airplay.c

@@ -3737,6 +3737,7 @@ airplay_device_cb(const char *name, const char *type, const char *domain, const
   rd->type = OUTPUT_TYPE_AIRPLAY;
   rd->type_name = outputs_name(rd->type);
   rd->extra_device_info = re;
+  rd->supported_formats = MEDIA_FORMAT_ALAC;
 
   if (port < 0)
     {

src/outputs/alsa.c

@@ -1374,6 +1374,7 @@ alsa_device_add(cfg_t* cfg_audio, int id)
   device->type = OUTPUT_TYPE_ALSA;
   device->type_name = outputs_name(device->type);
   device->extra_device_info = ae;
+  device->supported_formats = MEDIA_FORMAT_PCM;
 
   // The audio section will have no title, so there we get the value from the
   // "card" option

src/outputs/cast.c

@@ -1778,6 +1778,7 @@ cast_device_cb(const char *name, const char *type, const char *domain, const cha
   device->name = strdup(name);
   device->type = OUTPUT_TYPE_CAST;
   device->type_name = outputs_name(device->type);
+  device->supported_formats = MEDIA_FORMAT_OPUS;
 
   if (port < 0)
     {

src/outputs/fifo.c

@@ -491,6 +491,7 @@ fifo_init(void)
   device->type_name = outputs_name(device->type);
   device->has_video = 0;
   device->extra_device_info = path;
+  device->supported_formats = MEDIA_FORMAT_PCM;
   DPRINTF(E_INFO, L_FIFO, "Adding fifo output device '%s' with path '%s'\n", nickname, path);
 
   player_device_add(device);

src/outputs/pulse.c

@@ -436,6 +436,7 @@ sinklist_cb(pa_context *ctx, const pa_sink_info *info, int eol, void *userdata)
   device->type = OUTPUT_TYPE_PULSE;
   device->type_name = outputs_name(device->type);
   device->extra_device_info = strdup(info->name);
+  device->supported_formats = MEDIA_FORMAT_PCM;
 
   player_device_add(device);
 }

src/outputs/raop.c

@@ -4230,6 +4230,7 @@ raop_device_cb(const char *name, const char *type, const char *domain, const cha
   rd->type = OUTPUT_TYPE_RAOP;
   rd->type_name = outputs_name(rd->type);
   rd->extra_device_info = re;
+  rd->supported_formats = MEDIA_FORMAT_ALAC;
 
   if (port < 0)
     {

src/outputs/rcp.c

@@ -1295,6 +1295,8 @@ rcp_mdns_device_cb(const char *name, const char *type, const char *domain, const
   device->name = strdup(name);
   device->type = OUTPUT_TYPE_RCP;
   device->type_name = outputs_name(device->type);
+  device->default_format = MEDIA_FORMAT_WAV;
+  device->supported_formats = MEDIA_FORMAT_WAV | MEDIA_FORMAT_MP3 | MEDIA_FORMAT_ALAC;
 
   if (port < 0 || !address)
     {

src/outputs/streaming.c

@@ -65,7 +65,7 @@ struct streaming_wanted
   struct pipepair audio[WANTED_PIPES_MAX];
   struct pipepair metadata[WANTED_PIPES_MAX];
 
-  enum player_format format;
+  enum media_format format;
   struct media_quality quality;
 
   struct evbuffer *audio_in;
@@ -113,7 +113,7 @@ extern struct event_base *evbase_player;
 /* ------------------------------- Helpers ---------------------------------- */
 
 static struct encode_ctx *
-encoder_setup(enum player_format format, struct media_quality *quality)
+encoder_setup(enum media_format format, struct media_quality *quality)
 {
   struct transcode_encode_setup_args encode_args = { .profile = XCODE_MP3, .quality = quality };
   struct encode_ctx *encode_ctx = NULL;
@@ -132,7 +132,7 @@ encoder_setup(enum player_format format, struct media_quality *quality)
       goto out;
     }
 
-  if (format == PLAYER_FORMAT_MP3)
+  if (format == MEDIA_FORMAT_MP3)
     encode_ctx = transcode_encode_setup(encode_args);
 
   if (!encode_ctx)
@@ -217,7 +217,7 @@ pipe_index_find_byreadfd(struct pipepair *p, int readfd)
 }
 
 static struct streaming_wanted *
-wanted_new(enum player_format format, struct media_quality quality)
+wanted_new(enum media_format format, struct media_quality quality)
 {
   struct streaming_wanted *w;
 
@@ -277,7 +277,7 @@ wanted_remove(struct streaming_wanted **wanted, struct streaming_wanted *remove)
 }
 
 static struct streaming_wanted *
-wanted_add(struct streaming_wanted **wanted, enum player_format format, struct media_quality quality)
+wanted_add(struct streaming_wanted **wanted, enum media_format format, struct media_quality quality)
 {
   struct streaming_wanted *w;
 
@@ -289,7 +289,7 @@ wanted_add(struct streaming_wanted **wanted, enum player_format format, struct m
 }
 
 static struct streaming_wanted *
-wanted_find_byformat(struct streaming_wanted *wanted, enum player_format format, struct media_quality quality)
+wanted_find_byformat(struct streaming_wanted *wanted, enum media_format format, struct media_quality quality)
 {
   struct streaming_wanted *w;
 
@@ -623,9 +623,9 @@ streaming_start(struct output_device *device, int callback_id)
   int ret;
 
   pthread_mutex_lock(&streaming_wanted_lck);
-  w = wanted_find_byformat(streaming.wanted, device->format, device->quality);
+  w = wanted_find_byformat(streaming.wanted, device->selected_format, device->quality);
   if (!w)
-    w = wanted_add(&streaming.wanted, device->format, device->quality);
+    w = wanted_add(&streaming.wanted, device->selected_format, device->quality);
   ret = wanted_session_add(&device->audio_fd, &device->metadata_fd, w);
   if (ret < 0)
     goto error;