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/*
* Copyright (C) 2018 Konsulko Group
*
* 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.
*/
#include "fileplayer.h"
#include <string>
#include <cstring>
#include <iostream>
#include <mutex>
#include <condition_variable>
#include <json-c/json.h>
#undef DEBUG
struct set_role_data
{
bool state;
std::string output;
std::condition_variable cv;
};
static void on_hangup(void *closure, struct afb_wsj1 *wsj)
{
}
static void on_call(void *closure, const char *api, const char *verb, struct afb_wsj1_msg *msg)
{
}
static void on_event(void* closure, const char* event, struct afb_wsj1_msg *msg)
{
}
static void on_reply(void *closure, struct afb_wsj1_msg *msg)
{
struct set_role_data *data = (struct set_role_data*) closure;
struct json_object* reply;
if(!(data && data->state))
goto reply_done;
// We opened the role, return the output
reply = afb_wsj1_msg_object_j(msg);
if(reply) {
#ifdef DEBUG
std::cerr << __FUNCTION__ << ": reply = " << \
json_object_to_json_string_ext(reply, JSON_C_TO_STRING_SPACED | JSON_C_TO_STRING_PRETTY) << \
std::endl;
#endif
struct json_object* response;
int rc = json_object_object_get_ex(reply, "response", &response);
if(rc) {
struct json_object* val;
rc = json_object_object_get_ex(response, "device_uri", &val);
if (rc && json_object_get_string_len(val)) {
const char* jres_pcm = json_object_get_string(val);
data->output = jres_pcm;
#ifdef DEBUG
std::cerr << __FUNCTION__ << ": output = " << jres_pcm << std::endl;
#endif
}
}
}
reply_done:
// Signal reply is done
data->cv.notify_one();
}
static void *afb_loop_thread(struct sd_event* loop)
{
for(;;)
sd_event_run(loop, 30000000);
}
static void *gst_loop_thread(GMainLoop *loop)
{
if(loop)
g_main_loop_run(loop);
}
FilePlayer::FilePlayer(const int port, const std::string &token, const std::string &path, const std::string &role) :
m_path(path),
m_role(role)
{
std::string uri;
if(sd_event_new(&m_afb_loop) < 0) {
std::cerr << __FUNCTION__ << ": Failed to create event loop" << std::endl;
return;
}
// Initialize interface for websocket
m_itf.on_hangup = on_hangup;
m_itf.on_call = on_call;
m_itf.on_event = on_event;
uri = "ws://localhost:" + std::to_string(port) + "/api?token=" + token;
#ifdef DEBUG
std::cerr << "Using URI: " << uri << std::endl;
#endif
m_ws = afb_ws_client_connect_wsj1(m_afb_loop, uri.c_str(), &m_itf, NULL);
if(m_ws) {
m_afb_thread = std::thread(afb_loop_thread, m_afb_loop);
} else {
std::cerr << __FUNCTION__ << ": Failed to create websocket connection" << std::endl;
goto error;
}
// Initialize GStreamer
gst_init(NULL, NULL);
// Create elements we need
m_playbin = gst_element_factory_make("playbin", "play");
m_alsa_sink = gst_element_factory_make("alsasink", NULL);
if(!(m_playbin && m_alsa_sink))
goto error;
// Set up bus callback
m_bus = gst_pipeline_get_bus(GST_PIPELINE(m_playbin));
if(!m_bus)
goto error;
m_gst_loop = g_main_loop_new(NULL, FALSE);
if(!m_gst_loop)
goto error;
gst_bus_add_watch(m_bus, gstreamer_bus_callback, this);
// Start thread to run glib main loop for gstreamer bus
m_gst_thread = std::thread(gst_loop_thread, m_gst_loop);
m_valid = true;
return;
error:
gst_object_unref(m_playbin);
m_playbin = nullptr;
gst_object_unref(m_alsa_sink);
m_alsa_sink = nullptr;
gst_object_unref(m_bus);
m_bus = nullptr;
if(m_gst_loop) {
g_main_loop_quit(m_gst_loop);
m_gst_loop = nullptr;
}
if(m_afb_loop) {
sd_event_unref(m_afb_loop);
m_afb_loop = nullptr;
}
return;
}
FilePlayer::~FilePlayer(void)
{
gst_element_set_state(m_playbin, GST_STATE_NULL);
gst_object_unref(m_playbin);
gst_object_unref(m_alsa_sink);
gst_object_unref(m_bus);
sd_event_unref(m_afb_loop);
}
void FilePlayer::play(bool loop)
{
std::string output;
if(!m_valid || m_playing)
return;
if(set_role_state(true, &output) != 0)
return;
if(output.empty())
return;
m_playing = true;
m_looping = loop;
g_object_set(m_alsa_sink, "device", output.c_str(), NULL);
g_object_set(m_playbin, "audio-sink", m_alsa_sink, NULL);
std::string uri = "file://" + m_path;
g_object_set(m_playbin, "uri", uri.c_str(), NULL);
// Start playback
gst_element_set_state(m_playbin, GST_STATE_PLAYING);
return;
}
void FilePlayer::stop(void)
{
if(!(m_valid && m_playing))
return;
// Stop playback
gst_element_set_state(m_playbin, GST_STATE_PAUSED);
}
gboolean FilePlayer::gstreamer_bus_callback(GstBus *bus, GstMessage *msg, gpointer data)
{
if(!data)
return TRUE;
return static_cast<FilePlayer*>(data)->bus_callback(bus, msg);
}
int FilePlayer::set_role_state(bool state, std::string *output)
{
if(!m_valid)
return -1;
set_role_data data;
data.state = state;
json_object *jsonData = json_object_new_object();
json_object_object_add(jsonData, "action", json_object_new_string(state ? "open" : "close"));
int rc = afb_wsj1_call_j(m_ws, "ahl-4a", m_role.c_str(), jsonData, on_reply, (void*) &data);
if(rc >= 0) {
// Wait for response
std::mutex m;
std::unique_lock<std::mutex> lk(m);
data.cv.wait(lk);
if(state && output)
*output = data.output;
} else {
std::cerr << __FUNCTION__ << ": Failed to call ahl-4a/" << m_role.c_str() << std::endl;
}
return rc;
}
gboolean FilePlayer::bus_callback(GstBus *bus, GstMessage *msg)
{
switch (GST_MESSAGE_TYPE(msg)) {
case GST_MESSAGE_EOS:
#ifdef DEBUG
std::cerr << __FUNCTION__ << ": GST_MESSAGE_EOS" << std::endl;
#endif
if(m_looping) {
// restart playback if at end
if (!gst_element_seek(m_playbin,
1.0, GST_FORMAT_TIME, GST_SEEK_FLAG_FLUSH,
GST_SEEK_TYPE_SET, 0,
GST_SEEK_TYPE_NONE, GST_CLOCK_TIME_NONE)) {
std::cerr << "Seek failed!" << std::endl;
}
} else {
// Move stream to paused state since we're done
gst_element_set_state(m_playbin, GST_STATE_PAUSED);
}
break;
case GST_MESSAGE_STATE_CHANGED: {
if((GstElement*) GST_MESSAGE_SRC(msg) != m_playbin)
break;
GstState old_state, new_state;
gst_message_parse_state_changed(msg, &old_state, &new_state, NULL);
#ifdef DEBUG
std::cerr << __FUNCTION__ << ": GST_MESSAGE_STATE_CHANGE: " << (int) old_state << " to " << (int) new_state << std::endl;
#endif
if(old_state == GST_STATE_PLAYING && new_state == GST_STATE_PAUSED) {
set_role_state(false);
// Seek back to beginning so any subsequent play starts there
if (!gst_element_seek(m_playbin,
1.0, GST_FORMAT_TIME, GST_SEEK_FLAG_FLUSH,
GST_SEEK_TYPE_SET, 0,
GST_SEEK_TYPE_NONE, GST_CLOCK_TIME_NONE)) {
std::cerr << "Seek failed!" << std::endl;
}
m_playing = false;
} else if(old_state == GST_STATE_READY && new_state == GST_STATE_NULL) {
// clean up
g_main_loop_quit(m_gst_loop);
}
break;
}
default:
break;
}
return TRUE;
}
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