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/* ------------------------------------------------------------------
* Copyright (C) 2017 Matthias P. Braendli
*
* 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.
* -------------------------------------------------------------------
*/
/*! \file VLCInput.h
*
* This input uses libvlc to get audio data. It is extremely useful, and allows
* the encoder to use all inputs VLC supports.
*/
#pragma once
#include "config.h"
#if HAVE_VLC
#include <cstdio>
#include <string>
#include <sstream>
#include <vector>
#include <deque>
#include <thread>
#include <mutex>
#include <future>
#include <vlc/vlc.h>
#include "SampleQueue.h"
#include "common.h"
#include "InputInterface.h"
extern "C" {
#include "utils.h"
}
/*! Common functionality for the direct libvlc input and the
* threaded libvlc input
*/
struct ICY_TEXT_T {
std::string artist;
std::string title;
std::string now_playing;
bool operator==(const ICY_TEXT_T& other) const {
return
artist == other.artist and
title == other.title and
now_playing == other.now_playing;
}
bool operator!=(const ICY_TEXT_T& other) const {
return !(*this == other);
}
void useArtistTitle(const std::string& artist, const std::string& title) {
this->artist = artist;
this->title = title;
now_playing = "";
}
void useNowPlaying(const std::string& now_playing) {
artist = "";
title = "";
this->now_playing = now_playing;
}
};
class VLCInput : public InputInterface
{
public:
VLCInput(const std::string& uri,
int rate,
unsigned channels,
unsigned verbosity,
std::string& gain,
std::string& cache,
std::vector<std::string>& additional_opts,
SampleQueue<uint8_t>& queue) :
m_uri(uri),
m_verbosity(verbosity),
m_channels(channels),
m_rate(rate),
m_cache(cache),
m_additional_opts(additional_opts),
m_gain(gain),
m_vlc(nullptr),
m_mp(nullptr),
m_fault(false),
m_running(false),
m_samplequeue(queue) {}
VLCInput(const VLCInput& other) = delete;
VLCInput& operator=(const VLCInput& other) = delete;
virtual ~VLCInput();
/*! Initialise VLC and start playing, and start
* the libVLC thread that fills m_samplequeue */
virtual void prepare() override;
virtual bool read_source(size_t num_bytes) override;
/*! Write the last received ICY-Text to the
* file.
*/
void write_icy_text(const std::string& filename, bool dl_plus);
//! Callbacks for VLC
/*! Notification of VLC exit */
void exit_cb(void);
/*! Prepare a buffer for VLC */
void preRender_cb(
uint8_t** pp_pcm_buffer,
size_t size);
/*! Notification from VLC that the buffer is now filled.
* VLC also tells us how many channels and how many
* samples
*/
void postRender_cb(unsigned int channels, size_t size);
int getRate() { return m_rate; }
virtual bool fault_detected(void) const override { return m_fault; };
/*! Separator string used when artist/title are written
*/
static const std::string ICY_TEXT_SEPARATOR;
private:
/*! Stop the player and release resources
*/
void cleanup(void);
/*! Fill exactly length bytes into buf. Blocking.
*
* \return number of bytes written into buf, or
* -1 in case of error
*/
ssize_t m_read(uint8_t* buf, size_t length);
/*! Buffer used in the callback functions for VLC */
std::vector<float> m_current_buf;
std::mutex m_queue_mutex;
/*! Buffer containing all available samples from VLC */
std::deque<float> m_queue;
std::string m_uri;
unsigned m_verbosity;
unsigned m_channels;
int m_rate;
//! Whether to enable network caching in VLC or not
std::string m_cache;
//! Given as-is to libvlc, useful for additional arguments
std::vector<std::string> m_additional_opts;
/*! value for the VLC compressor filter --compressor-makeup
* setting. Many more compressor settings could be set.
*/
std::string m_gain;
/*! VLC can give us the ICY-Text from an Icecast stream,
* which we optionally write into a text file for ODR-PadEnc
*/
std::future<bool> icy_text_written;
std::mutex m_nowplaying_mutex;
ICY_TEXT_T m_nowplaying;
ICY_TEXT_T m_nowplaying_previous;
// VLC pointers
libvlc_instance_t *m_vlc;
libvlc_media_player_t *m_mp;
// For the thread
/* The thread running process takes samples from m_queue and writes
* them into m_samplequeue. This decouples m_queue from m_samplequeue
* which is directly used by odr-audioenc.cpp
*/
void process();
std::atomic<bool> m_fault;
std::atomic<bool> m_running;
std::thread m_thread;
SampleQueue<uint8_t>& m_samplequeue;
};
#endif // HAVE_VLC
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