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-rw-r--r--binding/afm-mediaplayer-binding.c620
1 files changed, 620 insertions, 0 deletions
diff --git a/binding/afm-mediaplayer-binding.c b/binding/afm-mediaplayer-binding.c
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+/*
+ * Copyright (C) 2017 Konsulko Group
+ * Author: Matt Ranostay <matt.ranostay@konsulko.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define _GNU_SOURCE
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <glib.h>
+#include <pthread.h>
+#include <gst/gst.h>
+#include <json-c/json.h>
+#include "afm-common.h"
+
+#define AFB_BINDING_VERSION 2
+#include <afb/afb-binding.h>
+
+static struct afb_event gstreamer_event;
+static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+
+static GList *playlist = NULL;
+static GList *current_track = NULL;
+
+typedef struct _CustomData {
+ GstElement *playbin;
+ gboolean playing;
+ guint volume;
+ gint64 position;
+ gint64 duration;
+} CustomData;
+
+CustomData data = {
+ .volume = 50,
+ .position = GST_CLOCK_TIME_NONE,
+ .duration = GST_CLOCK_TIME_NONE,
+};
+
+static json_object *populate_json(struct playlist_item *track)
+{
+ json_object *jresp = json_object_new_object();
+ json_object *jstring = json_object_new_string(track->media_path);
+ json_object_object_add(jresp, "path", jstring);
+
+ if (track->title) {
+ jstring = json_object_new_string(track->title);
+ json_object_object_add(jresp, "title", jstring);
+ }
+
+ if (track->album) {
+ jstring = json_object_new_string(track->album);
+ json_object_object_add(jresp, "album", jstring);
+ }
+
+ if (track->artist) {
+ jstring = json_object_new_string(track->artist);
+ json_object_object_add(jresp, "artist", jstring);
+ }
+
+ if (track->genre) {
+ jstring = json_object_new_string(track->genre);
+ json_object_object_add(jresp, "genre", jstring);
+ }
+
+ if (track->duration > 0)
+ json_object_object_add(jresp, "duration",
+ json_object_new_int64(track->duration));
+
+ json_object_object_add(jresp, "index",
+ json_object_new_int(track->id));
+
+ return jresp;
+}
+
+static gboolean populate_from_json(struct playlist_item *item, json_object *jdict)
+{
+ gboolean ret;
+ json_object *val = NULL;
+
+ ret = json_object_object_get_ex(jdict, "path", &val);
+ if (!ret)
+ return ret;
+ item->media_path = g_strdup(json_object_get_string(val));
+
+ ret = json_object_object_get_ex(jdict, "title", &val);
+ if (ret) {
+ item->title = g_strdup(json_object_get_string(val));
+ }
+
+ ret = json_object_object_get_ex(jdict, "album", &val);
+ if (ret) {
+ item->album = g_strdup(json_object_get_string(val));
+ }
+
+ ret = json_object_object_get_ex(jdict, "artist", &val);
+ if (ret) {
+ item->artist = g_strdup(json_object_get_string(val));
+ }
+
+ ret = json_object_object_get_ex(jdict, "genre", &val);
+ if (ret) {
+ item->genre = g_strdup(json_object_get_string(val));
+ }
+
+ ret = json_object_object_get_ex(jdict, "duration", &val);
+ if (ret) {
+ item->duration = json_object_get_int64(val);
+ }
+
+ return TRUE;
+}
+
+static int set_media_uri(struct playlist_item *item)
+{
+ if (!item || !item->media_path)
+ return -ENOENT;
+
+ gst_element_set_state(data.playbin, GST_STATE_NULL);
+
+ g_object_set(data.playbin, "uri", item->media_path, NULL);
+
+ data.position = GST_CLOCK_TIME_NONE;
+ data.duration = GST_CLOCK_TIME_NONE;
+
+ if (data.playing)
+ gst_element_set_state(data.playbin, GST_STATE_PLAYING);
+
+ g_object_set(data.playbin, "volume", data.volume / 100.0, NULL);
+
+ return 0;
+}
+
+static void populate_playlist(json_object *jquery)
+{
+ int i, idx = 0;
+ GList *list = g_list_last(playlist);
+
+ if (list && list->data) {
+ struct playlist_item *item = list->data;
+ idx = item->id + 1;
+ }
+
+ for (i = 0; i < json_object_array_length(jquery); i++) {
+ json_object *jdict = json_object_array_get_idx(jquery, i);
+ struct playlist_item *item = g_malloc0(sizeof(*item));
+ int ret;
+
+ if (item == NULL)
+ break;
+
+ ret = populate_from_json(item, jdict);
+ if (!ret) {
+ g_free_playlist_item(item);
+ continue;
+ }
+
+ item->id = idx++;
+ playlist = g_list_append(playlist, item);
+ }
+
+ current_track = g_list_first(playlist);
+ set_media_uri(current_track->data);
+}
+
+static void audio_playlist(struct afb_req request)
+{
+ const char *value = afb_req_value(request, "list");
+ json_object *jresp = NULL;
+
+ pthread_mutex_lock(&mutex);
+
+ if (value) {
+ json_object *jquery;
+
+ if (playlist) {
+ g_list_free_full(playlist, g_free_playlist_item);
+ playlist = NULL;
+ }
+
+ jquery = json_tokener_parse(value);
+ populate_playlist(jquery);
+
+ if (playlist == NULL)
+ afb_req_fail(request, "failed", "invalid playlist");
+ else
+ afb_req_success(request, NULL, NULL);
+
+ json_object_put(jquery);
+ } else {
+ GList *l;
+ json_object *jarray = json_object_new_array();
+ jresp = json_object_new_object();
+
+ for (l = playlist; l; l = l->next) {
+ json_object *item = populate_json(l->data);
+ json_object_array_add(jarray, item);
+ }
+
+ json_object_object_add(jresp, "list", jarray);
+ afb_req_success(request, jresp, "Playlist results");
+ }
+
+ pthread_mutex_unlock(&mutex);
+}
+
+static int seek_track(int cmd)
+{
+ GList *item = (cmd == NEXT_CMD) ? current_track->next : current_track->prev;
+ int ret;
+
+ if (item == NULL)
+ return -EINVAL;
+
+ ret = set_media_uri(item->data);
+ if (ret < 0)
+ return -EINVAL;
+
+ if (data.playing)
+ gst_element_set_state(data.playbin, GST_STATE_PLAYING);
+
+ current_track = item;
+
+ return 0;
+}
+
+static int seek_stream(const char *value, int cmd)
+{
+ gint64 position, current = 0;
+
+ if (value == NULL)
+ return -EINVAL;
+
+ position = strtoll(value, NULL, 10);
+
+ if (cmd != SEEK_CMD) {
+ gst_element_query_position (data.playbin, GST_FORMAT_TIME, &current);
+ position = (current / GST_MSECOND) + (FASTFORWARD_CMD ? position : -position);
+ }
+
+ if (position < 0)
+ position = 0;
+
+ if (data.duration > 0 && position > data.duration)
+ position = data.duration;
+
+ return gst_element_seek_simple(data.playbin, GST_FORMAT_TIME,
+ GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_KEY_UNIT,
+ position * GST_MSECOND);
+}
+
+/* @value can be one of the following values:
+ * play - go to playing transition
+ * pause - go to pause transition
+ * previous - skip to previous track
+ * next - skip to the next track
+ * seek - go to position (in milliseconds)
+ *
+ * fast-forward - skip forward in milliseconds
+ * rewind - skip backward in milliseconds
+ *
+ * pick-track - select track via index number
+ * volume - set volume between 0 - 100%
+ */
+
+static void controls(struct afb_req request)
+{
+ const char *value = afb_req_value(request, "value");
+ const char *position = afb_req_value(request, "position");
+ int cmd = get_command_index(value);
+
+ if (!value) {
+ afb_req_fail(request, "failed", "no value was passed");
+ return;
+ }
+
+ pthread_mutex_lock(&mutex);
+ errno = 0;
+
+ switch (cmd) {
+ case PLAY_CMD:
+ gst_element_set_state(data.playbin, GST_STATE_PLAYING);
+ data.playing = TRUE;
+ break;
+ case PAUSE_CMD:
+ gst_element_set_state(data.playbin, GST_STATE_PAUSED);
+ data.playing = FALSE;
+ break;
+ case PREVIOUS_CMD:
+ case NEXT_CMD:
+ seek_track(cmd);
+ break;
+ case SEEK_CMD:
+ case FASTFORWARD_CMD:
+ case REWIND_CMD:
+ seek_stream(position, cmd);
+ break;
+ case PICKTRACK_CMD: {
+ const char *parameter = afb_req_value(request, "index");
+ long int idx = strtol(parameter, NULL, 10);
+ GList *list = NULL;
+
+ if (idx == 0 && !errno) {
+ afb_req_fail(request, "failed", "invalid index");
+ pthread_mutex_unlock(&mutex);
+ return;
+ }
+
+ list = find_media_index(playlist, idx);
+ if (list != NULL) {
+ struct playlist_item *item = list->data;
+ set_media_uri(item);
+ current_track = list;
+ } else {
+ afb_req_fail(request, "failed", "couldn't find index");
+ pthread_mutex_unlock(&mutex);
+ return;
+ }
+
+ break;
+ }
+ case VOLUME_CMD: {
+ const char *parameter = afb_req_value(request, "volume");
+ long int volume = strtol(parameter, NULL, 10);
+
+ if (volume == 0 && !errno) {
+ afb_req_fail(request, "failed", "invalid volume");
+ pthread_mutex_unlock(&mutex);
+ return;
+ }
+
+ if (volume < 0)
+ volume = 0;
+ if (volume > 100)
+ volume = 100;
+
+ g_object_set(data.playbin, "volume", volume / 100.0, NULL);
+
+ break;
+ }
+ default:
+ afb_req_fail(request, "failed", "unknown command");
+ pthread_mutex_unlock(&mutex);
+ return;
+ }
+
+ afb_req_success(request, NULL, NULL);
+ pthread_mutex_unlock(&mutex);
+}
+
+static void metadata(struct afb_req request)
+{
+ struct playlist_item *track;
+ json_object *jresp;
+
+ pthread_mutex_lock(&mutex);
+
+ if (current_track == NULL || current_track->data == NULL) {
+ afb_req_fail(request, "failed", "No playlist");
+ pthread_mutex_unlock(&mutex);
+ return;
+ }
+
+ track = current_track->data;
+ jresp = populate_json(track);
+
+ if (data.duration != GST_CLOCK_TIME_NONE)
+ json_object_object_add(jresp, "duration",
+ json_object_new_int64(data.duration / GST_MSECOND));
+
+ if (data.position != GST_CLOCK_TIME_NONE)
+ json_object_object_add(jresp, "position",
+ json_object_new_int64(data.position / GST_MSECOND));
+
+ json_object_object_add(jresp, "volume",
+ json_object_new_int(data.volume));
+
+ pthread_mutex_unlock(&mutex);
+
+ afb_req_success(request, jresp, "Metadata results");
+}
+
+static void subscribe(struct afb_req request)
+{
+ const char *value = afb_req_value(request, "value");
+
+ if (value && !strcasecmp(value, "gstreamer")) {
+ afb_req_subscribe(request, gstreamer_event);
+ afb_req_success(request, NULL, NULL);
+ return;
+ }
+
+ afb_req_fail(request, "failed", "Invalid event");
+}
+
+static void unsubscribe(struct afb_req request)
+{
+ const char *value = afb_req_value(request, "value");
+
+ if (value && !strcasecmp(value, "gstreamer")) {
+ afb_req_unsubscribe(request, gstreamer_event);
+ afb_req_success(request, NULL, NULL);
+ return;
+ }
+
+ afb_req_fail(request, "failed", "Invalid event");
+}
+
+static gboolean handle_message(GstBus *bus, GstMessage *msg, CustomData *data)
+{
+ switch (GST_MESSAGE_TYPE (msg)) {
+ case GST_MESSAGE_EOS: {
+ int ret;
+
+ pthread_mutex_lock(&mutex);
+
+ data->position = GST_CLOCK_TIME_NONE;
+ data->duration = GST_CLOCK_TIME_NONE;
+
+ ret = seek_track(NEXT_CMD);
+ if (ret < 0) {
+ data->playing = FALSE;
+ current_track = playlist;
+ } else if (data->playing) {
+ gst_element_set_state(data->playbin, GST_STATE_PLAYING);
+ }
+
+ pthread_mutex_unlock(&mutex);
+ break;
+ }
+ case GST_MESSAGE_DURATION:
+ data->duration = GST_CLOCK_TIME_NONE;
+ break;
+ default:
+ break;
+ }
+
+ return TRUE;
+}
+
+static gboolean position_event(CustomData *data)
+{
+ struct playlist_item *track;
+ json_object *jresp = NULL;
+
+ pthread_mutex_lock(&mutex);
+
+ if (!data->playing || current_track == NULL) {
+ pthread_mutex_unlock(&mutex);
+ return TRUE;
+ }
+
+ track = current_track->data;
+ jresp = populate_json(track);
+
+ if (!GST_CLOCK_TIME_IS_VALID(data->duration))
+ gst_element_query_duration(data->playbin,
+ GST_FORMAT_TIME, &data->duration);
+
+ gst_element_query_position(data->playbin,
+ GST_FORMAT_TIME, &data->position);
+
+ json_object_object_add(jresp, "duration",
+ json_object_new_int64(data->duration / GST_MSECOND));
+ json_object_object_add(jresp, "position",
+ json_object_new_int64(data->position / GST_MSECOND));
+
+ pthread_mutex_unlock(&mutex);
+
+ afb_event_push(gstreamer_event, jresp);
+
+ return TRUE;
+}
+
+static void *gstreamer_loop_thread(void *ptr)
+{
+ GstBus *bus;
+ json_object *query, *response;
+ int ret;
+
+ gst_init(NULL, NULL);
+
+ data.playbin = gst_element_factory_make("playbin", "playbin");
+ if (!data.playbin) {
+ AFB_ERROR("Cannot create playbin");
+ exit(1);
+ }
+
+ bus = gst_element_get_bus(data.playbin);
+ gst_bus_add_watch(bus, (GstBusFunc) handle_message, &data);
+ g_timeout_add_seconds(1, (GSourceFunc) position_event, &data);
+
+ ret = afb_service_call_sync("mediascanner", "media_result", NULL, &response);
+ if (!ret) {
+ json_object *query = json_object_object_get(response, "response");
+
+ if (query)
+ query = json_object_object_get(query, "Media");
+
+ if (query)
+ populate_playlist(query);
+ }
+ json_object_put(response);
+
+ g_main_loop_run(g_main_loop_new(NULL, FALSE));
+
+ return NULL;
+}
+
+static void onevent(const char *event, struct json_object *object)
+{
+ if (!g_strcmp0(event, "mediascanner/media_added")) {
+ pthread_mutex_lock(&mutex);
+
+ json_object *query = json_object_object_get(object, "Media");
+ if (query)
+ populate_playlist(query);
+
+ pthread_mutex_unlock(&mutex);
+ } else if (!g_strcmp0(event, "mediascanner/media_removed")) {
+ json_object *query = json_object_object_get(object, "Path");
+ const char *path = json_object_get_string(query);
+ GList *l = playlist;
+
+ pthread_mutex_lock(&mutex);
+
+ while (l) {
+ struct playlist_item *item = l->data;
+
+ l = l->next;
+
+ if (!strncasecmp(path, item->media_path, strlen(path))) {
+ playlist = g_list_remove(playlist, item);
+ g_free_playlist_item(item);
+
+ if (current_track->data == item) {
+ current_track = NULL;
+ gst_element_set_state(data.playbin, GST_STATE_NULL);
+ }
+ }
+ }
+
+ current_track = g_list_first(playlist);
+
+ pthread_mutex_unlock(&mutex);
+ } else {
+ AFB_ERROR("Invalid event: %s", event);
+ }
+}
+
+static int init() {
+ pthread_t thread_id;
+ json_object *response, *query;
+ int ret;
+
+ ret = afb_daemon_require_api("mediascanner", 1);
+ if (ret < 0) {
+ AFB_ERROR("Cannot request mediascanner");
+ return ret;
+ }
+
+ query = json_object_new_object();
+ json_object_object_add(query, "value", json_object_new_string("media_added"));
+
+ ret = afb_service_call_sync("mediascanner", "subscribe", query, &response);
+ json_object_put(response);
+
+ if (ret < 0) {
+ AFB_ERROR("Cannot subscribe to mediascanner media_added event");
+ return ret;
+ }
+
+ query = json_object_new_object();
+ json_object_object_add(query, "value", json_object_new_string("media_removed"));
+
+ ret = afb_service_call_sync("mediascanner", "subscribe", query, &response);
+ json_object_put(response);
+
+ if (ret < 0) {
+ AFB_ERROR("Cannot subscribe to mediascanner media_remove event");
+ return ret;
+ }
+
+ gstreamer_event = afb_daemon_make_event("gstreamer");
+
+ return pthread_create(&thread_id, NULL, gstreamer_loop_thread, NULL);
+}
+
+static const struct afb_verb_v2 binding_verbs[] = {
+ { .verb = "playlist", .callback = audio_playlist, .info = "Get/set playlist" },
+ { .verb = "controls", .callback = controls, .info = "Audio controls" },
+ { .verb = "metadata", .callback = metadata, .info = "Get metadata of current track" },
+ { .verb = "subscribe", .callback = subscribe, .info = "Subscribe to GStreamer events" },
+ { .verb = "unsubscribe", .callback = unsubscribe, .info = "Unsubscribe to GStreamer events" },
+ { }
+};
+
+/*
+ * binder API description
+ */
+const struct afb_binding_v2 afbBindingV2 = {
+ .api = "mediaplayer",
+ .specification = "Mediaplayer API",
+ .verbs = binding_verbs,
+ .onevent = onevent,
+ .init = init,
+};