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/*
* Copyright (C) 2018,2019 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>
#undef DEBUG
static void *gst_loop_thread(GMainLoop *loop)
{
if(loop)
g_main_loop_run(loop);
}
FilePlayer::FilePlayer(const std::string &path, const std::string &role) :
m_path(path),
m_role(role)
{
std::string uri;
// 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;
}
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);
}
void FilePlayer::play(bool loop)
{
if(!m_valid || m_playing)
return;
m_playing = true;
m_looping = loop;
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);
}
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) {
// 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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