Finalize Audio plugin

Signed-off-by: Manuel Bachmann <mbc@iot.bzh>

4 files changed, 275 insertions, 13 deletions

diff --git a/plugins/audio/audio-alsa.c b/plugins/audio/audio-alsa.c
index 8c08c8db..4d97c2d2 100644
--- a/plugins/audio/audio-alsa.c
+++ b/plugins/audio/audio-alsa.c
@@ -1,3 +1,21 @@
+/*
+ * Copyright (C) 2015 "IoT.bzh"
+ * Author "Manuel Bachmann"
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
 #include "audio-api.h"
 #include "audio-alsa.h"
 
@@ -5,6 +23,11 @@ PUBLIC unsigned char _alsa_init (const char *name, audioCtxHandleT *ctx) {
 
     snd_pcm_t *dev;
     snd_pcm_hw_params_t *params;
+    snd_mixer_t *mixer;
+    snd_mixer_selem_id_t *mixer_sid;
+    snd_mixer_elem_t *mixer_elm;
+    unsigned int rate = 22050;
+    long vol, vol_min, vol_max;
     int num;
 
     if (snd_pcm_open (&dev, name, SND_PCM_STREAM_PLAYBACK, 0) < 0)
@@ -14,14 +37,30 @@ PUBLIC unsigned char _alsa_init (const char *name, audioCtxHandleT *ctx) {
     snd_pcm_hw_params_any (dev, params);
     snd_pcm_hw_params_set_access (dev, params, SND_PCM_ACCESS_RW_INTERLEAVED);
     snd_pcm_hw_params_set_format (dev, params, SND_PCM_FORMAT_S16_LE);
-    snd_pcm_hw_params_set_rate_near (dev, params, &ctx->rate, 0);
+    snd_pcm_hw_params_set_rate_near (dev, params, &rate, 0);
     snd_pcm_hw_params_set_channels (dev, params, ctx->channels);
     if (snd_pcm_hw_params (dev, params) < 0) {
         snd_pcm_hw_params_free (params);
         return 0;
     }
     snd_pcm_prepare (dev);
-    
+
+    snd_mixer_open (&mixer, 0);
+    if (snd_mixer_attach (mixer, name) < 0) {
+        snd_pcm_hw_params_free (params);
+        return 0;
+    }
+    snd_mixer_selem_register (mixer, NULL, NULL);
+    snd_mixer_load (mixer);
+
+    snd_mixer_selem_id_alloca (&mixer_sid);
+    snd_mixer_selem_id_set_index (mixer_sid, 0);
+    snd_mixer_selem_id_set_name (mixer_sid, "Master");
+
+    mixer_elm = snd_mixer_find_selem (mixer, mixer_sid);
+    snd_mixer_selem_get_playback_volume_range (mixer_elm, &vol_min, &vol_max);
+    snd_mixer_selem_get_playback_volume (mixer_elm, SND_MIXER_SCHN_FRONT_LEFT, &vol);
+
     /* allocate the global array if it hasn't been done */
     if (!dev_ctx) {
         dev_ctx = (dev_ctx_T**) malloc (sizeof(dev_ctx_T));
@@ -39,10 +78,19 @@ PUBLIC unsigned char _alsa_init (const char *name, audioCtxHandleT *ctx) {
     num++;
 
     /* it's not... let us add it to the global array */
+    dev_ctx = (dev_ctx_T**) realloc (dev_ctx, (num+1)*sizeof(dev_ctx_T));
     dev_ctx[num] = (dev_ctx_T*) malloc (sizeof(dev_ctx_T));
     dev_ctx[num]->name = strdup (name);
     dev_ctx[num]->dev = dev;
     dev_ctx[num]->params = params;
+    dev_ctx[num]->mixer_elm = mixer_elm;
+    dev_ctx[num]->vol_max = vol_max;
+    dev_ctx[num]->vol = vol;
+
+    /* make the client context aware of current card state */
+    ctx->volume = _alsa_get_volume (num);
+    ctx->mute = _alsa_get_mute (num);
+    ctx->idx = num;
 
     return 1;
 }
@@ -79,4 +127,63 @@ PUBLIC void _alsa_play (unsigned int num, void *buf, int len) {
         snd_pcm_prepare (dev_ctx[num]->dev);
     }
     /* snd_pcm_drain (dev_ctx[num]->dev); */
-}
\ No newline at end of file
+}
+
+PUBLIC unsigned int _alsa_get_volume (unsigned int num) {
+
+    if (!dev_ctx || !dev_ctx[num])
+        return;
+
+    snd_mixer_selem_get_playback_volume (dev_ctx[num]->mixer_elm, SND_MIXER_SCHN_FRONT_LEFT, &dev_ctx[num]->vol);
+
+    return (unsigned int)(dev_ctx[num]->vol*100)/dev_ctx[num]->vol_max;
+}
+
+PUBLIC unsigned int _alsa_set_volume (unsigned int num, unsigned int vol) {
+
+    if (!dev_ctx || !dev_ctx[num] || vol > 100)
+        return;
+
+   snd_mixer_selem_set_playback_volume_all (dev_ctx[num]->mixer_elm, (vol*dev_ctx[num]->vol_max)/100);
+}
+
+PUBLIC unsigned char _alsa_get_mute (unsigned int num) {
+
+    int mute = 0;
+
+    if (!dev_ctx || !dev_ctx[num])
+        return;
+
+    if (snd_mixer_selem_has_playback_switch (dev_ctx[num]->mixer_elm)) {
+        snd_mixer_selem_get_playback_switch (dev_ctx[num]->mixer_elm, SND_MIXER_SCHN_FRONT_LEFT, &mute); 
+        snd_mixer_selem_get_playback_switch (dev_ctx[num]->mixer_elm, SND_MIXER_SCHN_FRONT_RIGHT, &mute); 
+
+    }
+
+    return (unsigned char)mute;
+}
+
+PUBLIC void _alsa_set_mute (unsigned int num, unsigned char mute) {
+
+    if (!dev_ctx || !dev_ctx[num] || 1 < mute < 0)
+        return;
+
+    if (snd_mixer_selem_has_playback_switch (dev_ctx[num]->mixer_elm))
+        snd_mixer_selem_set_playback_switch_all (dev_ctx[num]->mixer_elm, mute);
+}
+
+PUBLIC void _alsa_set_rate (unsigned int num, unsigned int rate) {
+
+    if (!dev_ctx || !dev_ctx[num])
+        return;
+
+    snd_pcm_hw_params_set_rate_near (dev_ctx[num]->dev, dev_ctx[num]->params, &rate, 0);
+}
+
+PUBLIC void _alsa_set_channels (unsigned int num, unsigned int channels) {
+
+    if (!dev_ctx || !dev_ctx[num])
+        return;
+
+    snd_pcm_hw_params_set_channels (dev_ctx[num]->dev, dev_ctx[num]->params, channels);
+}
diff --git a/plugins/audio/audio-alsa.h b/plugins/audio/audio-alsa.h
index a85f419d..9a4b0b58 100644
--- a/plugins/audio/audio-alsa.h
+++ b/plugins/audio/audio-alsa.h
@@ -1,3 +1,21 @@
+/*
+ * Copyright (C) 2015 "IoT.bzh"
+ * Author "Manuel Bachmann"
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
 #ifndef AUDIO_ALSA_H
 #define AUDIO_ALSA_H
 
@@ -11,8 +29,14 @@ struct dev_ctx {
   char *name;
   snd_pcm_t *dev;
   snd_pcm_hw_params_t *params;
+  snd_mixer_elem_t *mixer_elm;
+  long vol_max;
+  long vol;
 };
 
+PUBLIC unsigned int _alsa_get_volume (unsigned int);
+PUBLIC unsigned char _alsa_get_mute (unsigned int);
+
 static struct dev_ctx **dev_ctx = NULL;
 
-#endif /* AUDIO_ALSA_H */
\ No newline at end of file
+#endif /* AUDIO_ALSA_H */
diff --git a/plugins/audio/audio-api.c b/plugins/audio/audio-api.c
index 547f97ed..0fcc73d1 100644
--- a/plugins/audio/audio-api.c
+++ b/plugins/audio/audio-api.c
@@ -1,6 +1,6 @@
 /*
  * Copyright (C) 2015 "IoT.bzh"
- * Author "Fulup Ar Foll"
+ * Author "Manuel Bachmann"
  *
  * 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
@@ -28,17 +28,29 @@ STATIC audioCtxHandleT* initAudioCtx () {
     audioCtxHandleT *ctx;
 
     ctx = malloc (sizeof(audioCtxHandleT));
+    ctx->idx = -1;
     ctx->volume = 25;
-    ctx->rate = 22050;
     ctx->channels = 2;
+    ctx->mute = 0;
 
     return ctx;
 }
 
+STATIC AFB_error releaseAudio (audioCtxHandleT *ctx) {
+
+    /* power it off */
+    _alsa_free (ctx->idx);
+
+    /* clean client context */
+    ctx->idx = -1;
+
+    return AFB_SUCCESS;
+}
+
 /* called when client session dies [e.g. client quits for more than 15mns] */
 STATIC json_object* freeAudio (AFB_clientCtx *client) {
 
-    //releaseAudio (client->plugin->handle, client->ctx);
+    releaseAudio (client->ctx);
     free (client->ctx);
     
     return jsonNewMessage (AFB_SUCCESS, "Released radio and client context");
@@ -51,6 +63,7 @@ STATIC json_object* init (AFB_request *request) {       /* AFB_SESSION_CREATE */
 
     audioCtxHandleT *ctx;
     json_object *jresp;
+    int idx;
 
     /* create a private client context */
     ctx = initAudioCtx();
@@ -60,13 +73,112 @@ STATIC json_object* init (AFB_request *request) {       /* AFB_SESSION_CREATE */
     
     jresp = json_object_new_object();
     json_object_object_add (jresp, "token", json_object_new_string (request->client->token));
+    return jresp;
 }
 
+STATIC json_object* volume (AFB_request *request) {      /* AFB_SESSION_CHECK */
 
-STATIC AFB_restapi pluginApis[]= {
-  {"init"   , AFB_SESSION_CREATE, (AFB_apiCB)init       , "Audio API - init"},
-//  {"error"  , AFB_SESSION_CHECK,   (AFB_apiCB)wrongApi   , "Ping Application Framework"},
+    audioCtxHandleT *ctx = (audioCtxHandleT*)request->client->ctx;
+    const char *value = getQueryValue (request, "value");
+    json_object *jresp;
+    int volume;
+    char volume_str[256];
+
+    /* no "?value=" parameter : return current state */
+    if (!value) {
+        ctx->volume = _alsa_get_volume (ctx->idx);
+        snprintf (volume_str, sizeof(volume_str), "%d", ctx->volume);
+        jresp = json_object_new_object();
+        json_object_object_add (jresp, "volume", json_object_new_string(volume_str));
+    }
+
+    /* "?value=" parameter, set volume */
+    else {
+        volume = atoi (value);
+        if (100 < volume < 0) {
+            request->errcode = MHD_HTTP_SERVICE_UNAVAILABLE;
+            return (jsonNewMessage (AFB_FAIL, "Volume must be between 0 and 100"));
+        }
+        ctx->volume = volume;
+        _alsa_set_volume (ctx->idx, ctx->volume);
+
+        snprintf (volume_str, sizeof(volume_str), "%d", ctx->volume);
+        jresp = json_object_new_object();
+        json_object_object_add (jresp, "volume", json_object_new_string(volume_str));
+    }
+
+    return jresp;
+}
+
+STATIC json_object* channels (AFB_request *request) {    /* AFB_SESSION_CHECK */
+
+    audioCtxHandleT *ctx = (audioCtxHandleT*)request->client->ctx;
+    const char *value = getQueryValue (request, "value");
+    json_object *jresp = json_object_new_object();
+    char channels_str[256];
+
+    /* no "?value=" parameter : return current state */
+    if (!value) {
+        snprintf (channels_str, sizeof(channels_str), "%d", ctx->channels);
+        json_object_object_add (jresp, "channels", json_object_new_string (channels_str));
+    }
+
+    /* "?value=" parameter, set channels */
+    else {
+        ctx->channels = atoi (value);
+        _alsa_set_channels (ctx->idx, ctx->channels);
+
+        snprintf (channels_str, sizeof(channels_str), "%d", ctx->channels);
+        json_object_object_add (jresp, "channels", json_object_new_string (channels_str));
+    }
+
+    return jresp;
+}
 
+STATIC json_object* mute (AFB_request *request) {        /* AFB_SESSION_CHECK */
+
+    audioCtxHandleT *ctx = (audioCtxHandleT*)request->client->ctx;
+    const char *value = getQueryValue (request, "value");
+    json_object *jresp = json_object_new_object();
+
+    /* no "?value=" parameter : return current state */
+    if (!value) {
+        ctx->mute = _alsa_get_mute (ctx->idx);
+        ctx->mute ?
+            json_object_object_add (jresp, "mute", json_object_new_string ("on"))
+          : json_object_object_add (jresp, "mute", json_object_new_string ("off"));
+    }
+
+    /* "?value=" parameter is "1" or "on" */
+    else if ( atoi(value) == 1 || !strcasecmp(value, "on") ) {
+        ctx->mute = 1;
+        _alsa_set_mute (ctx->idx, ctx->mute);
+
+        json_object_object_add (jresp, "mute", json_object_new_string ("on"));
+    }
+
+    /* "?value=" parameter is "0" or "off" */
+    if ( atoi(value) == 0 || !strcasecmp(value, "off") ) {
+        ctx->mute = 0;
+        _alsa_set_mute (ctx->idx, ctx->mute);
+
+        json_object_object_add (jresp, "mute", json_object_new_string ("off"));
+    }
+
+    return jresp;
+}
+
+STATIC json_object* status (AFB_request *request) {      /* AFB_SESSION_RENEW */
+    return NULL;
+}
+
+
+STATIC AFB_restapi pluginApis[]= {
+  {"init"    , AFB_SESSION_CREATE, (AFB_apiCB)init      , "Audio API - init"},
+  {"volume"  , AFB_SESSION_CHECK,  (AFB_apiCB)volume    , "Audio API - volume"},
+  {"channels", AFB_SESSION_CHECK,  (AFB_apiCB)channels  , "Audio API - channels"},
+  {"mute"    , AFB_SESSION_CHECK,  (AFB_apiCB)mute      , "Audio API - mute"},
+  {"status"  , AFB_SESSION_RENEW,  (AFB_apiCB)status    , "Audio API - status"},
   {NULL}
 };
 
@@ -80,4 +192,4 @@ PUBLIC AFB_plugin *audioRegister () {
     plugin->freeCtxCB = freeAudio;
 
     return (plugin);
-};
\ No newline at end of file
+};
diff --git a/plugins/audio/audio-api.h b/plugins/audio/audio-api.h
index 0928f0fa..8acb1bd8 100644
--- a/plugins/audio/audio-api.h
+++ b/plugins/audio/audio-api.h
@@ -1,3 +1,21 @@
+/*
+ * Copyright (C) 2015 "IoT.bzh"
+ * Author "Manuel Bachmann"
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
 #ifndef AUDIO_API_H
 #define AUDIO_API_H
 
@@ -17,10 +35,11 @@ typedef struct {
 /* private client context [will be destroyed when client leaves] */
 typedef struct {
   audioDevT *radio;        /* pointer to client audio card          */
+  int idx;                 /* audio card index within global array  */
   unsigned int volume;     /* audio volume : 0-100                  */
-  unsigned int rate;       /* audio rate (Hz)                       */
   unsigned int channels;   /* audio channels : 1(mono)/2(stereo)... */
+  unsigned char mute;      /* audio muted : 0(false)/1(true)        */
 } audioCtxHandleT;
 
 
-#endif /* AUDIO_API_H */
\ No newline at end of file
+#endif /* AUDIO_API_H */