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/* ------------------------------------------------------------------
* Copyright (C) 2015 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.
* -------------------------------------------------------------------
*/
#ifndef __VLC_INPUT_H_
#define __VLC_INPUT_H_
#include "config.h"
#if HAVE_VLC
#include <cstdio>
#include <string>
#include <vector>
#include <deque>
#include <thread>
#include <mutex>
#include <future>
#include <vlc/vlc.h>
#include "SampleQueue.h"
// 16 bits per sample is fine for now
#define BYTES_PER_SAMPLE 2
/* Common functionality for the direct libvlc input and the
* threaded libvlc input
*/
class VLCInput
{
public:
VLCInput(const std::string& uri,
int rate,
unsigned channels,
unsigned verbosity,
std::string& gain,
std::string& cache) :
m_uri(uri),
m_verbosity(verbosity),
m_channels(channels),
m_rate(rate),
m_cache(cache),
m_gain(gain),
m_vlc(nullptr),
m_mp(nullptr) { }
~VLCInput() { cleanup(); }
/* Prepare the audio input */
int prepare();
/* Write the last received ICY-Text to the
* file.
*/
void write_icy_text(const std::string& filename);
// 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
*/
void postRender_cb();
int getRate() { return m_rate; }
int getChannels() { return m_channels; }
protected:
void cleanup(void);
// Fill exactly length bytes into buf. Blocking.
ssize_t m_read(uint8_t* buf, size_t length);
std::vector<uint8_t> m_current_buf;
mutable std::mutex m_queue_mutex;
std::deque<uint8_t> 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;
// value for the VLC compressor filter
std::string m_gain;
std::future<bool> icy_text_written;
std::string m_nowplaying;
std::string m_nowplaying_previous;
// VLC pointers
libvlc_instance_t *m_vlc;
libvlc_media_player_t *m_mp;
private:
VLCInput(const VLCInput& other) {}
};
class VLCInputDirect : public VLCInput
{
public:
VLCInputDirect(const std::string& uri,
int rate,
unsigned channels,
unsigned verbosity,
std::string& gain,
std::string& cache) :
VLCInput(uri, rate, channels, verbosity, gain, cache) {}
/* Read exactly length bytes into buf.
* Blocks if not enough data is available,
* or returns zero if EOF reached.
*
* Returns the number of bytes written into
* the buffer.
*/
ssize_t read(uint8_t* buf, size_t length);
};
class VLCInputThreaded : public VLCInput
{
public:
VLCInputThreaded(const std::string& uri,
int rate,
unsigned channels,
unsigned verbosity,
std::string& gain,
std::string& cache,
SampleQueue<uint8_t>& queue) :
VLCInput(uri, rate, channels, verbosity, gain, cache),
m_fault(false),
m_running(false),
m_queue(queue) {}
~VLCInputThreaded()
{
if (m_running) {
m_running = false;
m_thread.join();
}
}
/* Start the libVLC thread that fills the queue */
virtual void start();
bool fault_detected() { return m_fault; };
private:
VLCInputThreaded(const VLCInputThreaded& other) = delete;
VLCInputThreaded& operator=(const VLCInputThreaded& other) = delete;
void process();
std::atomic<bool> m_fault;
std::atomic<bool> m_running;
std::thread m_thread;
SampleQueue<uint8_t>& m_queue;
};
#endif // HAVE_VLC
#endif
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