+#include <afb/afb-plugin.h>
+#include <afb/afb-req-itf.h>
+
+/* ------ BACKEND FUNCTIONS ------- */
+
+unsigned char _backend_init (const char *name, audioCtxHandleT *ctx) {
+
+ char *backend_env = getenv ("AFB_AUDIO_OUTPUT");
+ unsigned char res = 0;
+
+# ifdef HAVE_PULSE
+ if (!backend_env || (strcasecmp (backend_env, "Pulse") == 0))
+ res = _pulse_init (name, ctx);
+ if (!res)
+#endif
+ res = _alsa_init (name, ctx);
+
+ if (!res)
+ fprintf (stderr, "Could not initialize Audio backend\n");
+
+ return res;
+}
+
+void _backend_free (audioCtxHandleT *ctx) {
+
+# ifdef HAVE_PULSE
+ if (ctx->audio_dev) _pulse_free (ctx); else
+# endif
+ _alsa_free (ctx->name);
+}
+
+void _backend_play (audioCtxHandleT *ctx) {
+
+# ifdef HAVE_PULSE
+ if (ctx->audio_dev) _pulse_play (ctx); else
+# endif
+ _alsa_play (ctx->idx);
+}
+
+void _backend_stop (audioCtxHandleT *ctx) {
+
+# ifdef HAVE_PULSE
+ if (ctx->audio_dev) _pulse_stop (ctx); else
+# endif
+ _alsa_stop (ctx->idx);
+}
+
+unsigned int _backend_get_volume (audioCtxHandleT *ctx, unsigned int channel) {
+
+# ifdef HAVE_PULSE
+ if (ctx->audio_dev) return _pulse_get_volume (ctx, channel); else
+# endif
+ return _alsa_get_volume (ctx->idx, channel);
+}
+
+void _backend_set_volume (audioCtxHandleT *ctx, unsigned int channel, unsigned int vol) {
+
+# ifdef HAVE_PULSE
+ if (ctx->audio_dev) _pulse_set_volume (ctx, channel, vol); else
+# endif
+ _alsa_set_volume (ctx->idx, channel, vol);
+}
+
+void _backend_set_volume_all (audioCtxHandleT *ctx, unsigned int vol) {
+
+# ifdef HAVE_PULSE
+ if (ctx->audio_dev) _pulse_set_volume_all (ctx, vol); else
+# endif
+ _alsa_set_volume_all (ctx->idx, vol);
+}
+
+unsigned char _backend_get_mute (audioCtxHandleT *ctx) {
+
+# ifdef HAVE_PULSE
+ if (ctx->audio_dev) return _pulse_get_mute (ctx); else
+# endif
+ return _alsa_get_mute (ctx->idx);
+}
+
+void _backend_set_mute (audioCtxHandleT *ctx, unsigned char mute) {
+
+# ifdef HAVE_PULSE
+ if (ctx->audio_dev) _pulse_set_mute (ctx, mute); else
+# endif
+ _alsa_set_mute (ctx->idx, mute);
+}
+
+void _backend_set_channels (audioCtxHandleT *ctx, unsigned int channels) {
+
+# ifdef HAVE_PULSE
+ if (ctx->audio_dev) return; else
+# endif
+ _alsa_set_channels (ctx->idx, channels);
+}
+
+/* ------ LOCAL HELPER FUNCTIONS --------- */
+
+/* private client context constructor ; default values */
+static audioCtxHandleT* initAudioCtx () {
+
+ audioCtxHandleT *ctx;
+ int i;
+
+ ctx = malloc (sizeof(audioCtxHandleT));
+ ctx->audio_dev = NULL;
+ ctx->name = NULL;
+ ctx->idx = -1;
+ for (i = 0; i < 8; i++)
+ ctx->volume[i] = 25;
+ ctx->channels = 2;
+ ctx->mute = 0;
+ ctx->is_playing = 0;
+
+ return ctx;
+}
+
+static void releaseAudioCtx (void *context) {
+
+ audioCtxHandleT *ctx = (audioCtxHandleT*) context;
+
+ /* power it off */
+ _backend_free (ctx);
+
+ /* clean client context */
+ ctx->audio_dev = NULL;
+ if (ctx->name)
+ free (ctx->name);
+ ctx->idx = -1;
+ free (ctx);
+}
+
+
+/* ------ PUBLIC PLUGIN FUNCTIONS --------- */
+
+static void init (struct afb_req request) { /* AFB_SESSION_CHECK */
+
+ audioCtxHandleT *ctx = afb_req_context_get (request);
+ json_object *jresp;
+
+ /* create a private client context */
+ if (!ctx) {
+ ctx = initAudioCtx();
+ afb_req_context_set (request, ctx, releaseAudioCtx);
+ }
+
+ if (!_backend_init ("default", ctx))
+ afb_req_fail (request, "failed", "backend initialization failed");
+
+ jresp = json_object_new_object();
+ json_object_object_add (jresp, "init", json_object_new_string ("success"));
+ afb_req_success (request, jresp, "Audio initialized");
+}
+
+static void volume (struct afb_req request) { /* AFB_SESSION_CHECK */
+
+ audioCtxHandleT *ctx = afb_req_context_get (request);
+ const char *value = afb_req_value (request, "value");
+ json_object *jresp;
+ unsigned int volume[8], i;
+ char *volume_i;
+ char volume_str[256];
+ size_t len_str = 0;
+
+ if (!ctx) {
+ afb_req_fail (request, "failed", "you must call 'init' first");
+ return;
+ }
+ jresp = json_object_new_object();
+
+ /* no "?value=" parameter : return current state */
+ if (!value) {
+ for (i = 0; i < 8; i++) {
+ ctx->volume[i] = _backend_get_volume (ctx, i);
+ snprintf (volume_str+len_str, sizeof(volume_str)-len_str, "%d,", ctx->volume[i]);
+ len_str = strlen (volume_str);
+ }
+ json_object_object_add (jresp, "volume", json_object_new_string(volume_str));
+ afb_req_success (request, jresp, "Audio - Volume obtained");
+ return;
+ }
+
+ /* "?value=" parameter, set volume */
+ else {
+ volume_i = strdup (value);
+ volume_i = strtok (volume_i, ",");
+ volume[0] = (unsigned int) atoi (volume_i);
+
+ if (100 < volume[0]) {
+ free (volume_i);
+ afb_req_fail (request, "failed", "volume must be between 0 and 100");
+ return;
+ }
+ ctx->volume[0] = volume[0];
+ _backend_set_volume (ctx, 0, ctx->volume[0]);
+ snprintf (volume_str, sizeof(volume_str), "%d,", ctx->volume[0]);
+
+ for (i = 1; i < 8; i++) {
+ volume_i = strtok (NULL, ",");
+ /* if there is only one value, set all channels to this one */
+ if (!volume_i && i == 1)
+ _backend_set_volume_all (ctx, ctx->volume[0]);
+ if (!volume_i || 100 < atoi(volume_i) || atoi(volume_i) < 0)
+ ctx->volume[i] = _backend_get_volume (ctx, i);
+ else {
+ ctx->volume[i] = (unsigned int) atoi(volume_i);
+ _backend_set_volume (ctx, i, ctx->volume[i]);
+ }
+ len_str = strlen(volume_str);
+ snprintf (volume_str+len_str, sizeof(volume_str)-len_str, "%d,", ctx->volume[i]);
+ }
+ free (volume_i);
+ json_object_object_add (jresp, "volume", json_object_new_string(volume_str));
+ }
+
+ afb_req_success (request, jresp, "Audio - Volume changed");