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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.
* -------------------------------------------------------------------
*/
#include <cstdio>
#include <string>
#include "VLCInput.h"
#include "config.h"
#if HAVE_VLC
#include <sys/time.h>
#include <boost/date_time/posix_time/posix_time.hpp>
using namespace std;
// VLC Audio prerender callback
void prepareRender(
void* p_audio_data,
uint8_t** pp_pcm_buffer,
size_t size)
{
VLCInput* in = (VLCInput*)p_audio_data;
in->preRender(pp_pcm_buffer, size);
}
// Audio postrender callback
void handleStream(
void* p_audio_data,
uint8_t* p_pcm_buffer,
unsigned int channels,
unsigned int rate,
unsigned int nb_samples,
unsigned int bits_per_sample,
size_t size,
int64_t pts)
{
VLCInput* in = (VLCInput*)p_audio_data;
assert(channels == 2);
assert(rate == in->getRate());
assert(bits_per_sample == 8*BYTES_PER_SAMPLE);
in->postRender(p_pcm_buffer, size);
}
int VLCInput::prepare()
{
int err;
fprintf(stderr, "Initialising VLC...\n");
// VLC options
char smem_options[512];
snprintf(smem_options, sizeof(smem_options),
"#transcode{acodec=s16l,samplerate=%d}:"
// We are using transcode because smem only support raw audio and
// video formats
"smem{"
"audio-postrender-callback=%lld,"
"audio-prerender-callback=%lld,"
"audio-data=%lld"
"}",
m_rate,
(long long int)(intptr_t)(void*)&handleStream,
(long long int)(intptr_t)(void*)&prepareRender,
(long long int)(intptr_t)this);
char verb_options[512];
snprintf(verb_options, sizeof(verb_options),
"--verbose=%d", m_verbosity);
const char * const vlc_args[] = {
verb_options,
"--sout", smem_options // Stream to memory
};
// Launch VLC
m_vlc = libvlc_new(sizeof(vlc_args) / sizeof(vlc_args[0]), vlc_args);
// Load the media
libvlc_media_t *m;
m = libvlc_media_new_location(m_vlc, m_uri.c_str());
m_mp = libvlc_media_player_new_from_media(m);
libvlc_media_release(m);
// Start playing
libvlc_media_player_play(m_mp);
fprintf(stderr, "VLC launched.\n");
return 0;
}
void VLCInput::preRender(uint8_t** pp_pcm_buffer, size_t size)
{
const size_t max_length = 20 * size;
for (;;) {
boost::mutex::scoped_lock lock(m_queue_mutex);
if (m_queue.size() < max_length) {
m_current_buf.resize(size);
*pp_pcm_buffer = &m_current_buf[0];
return;
}
lock.unlock();
boost::this_thread::sleep(boost::posix_time::milliseconds(1));
}
}
void VLCInput::postRender(uint8_t* p_pcm_buffer, size_t size)
{
boost::mutex::scoped_lock lock(m_queue_mutex);
assert(m_current_buf.size() == size);
size_t queue_size = m_queue.size();
m_queue.resize(m_queue.size() + size);
std::copy(m_current_buf.begin(), m_current_buf.end(),
m_queue.begin() + queue_size);
}
ssize_t VLCInput::m_read(uint8_t* buf, size_t length)
{
ssize_t err = 0;
for (;;) {
boost::mutex::scoped_lock lock(m_queue_mutex);
if (m_queue.size() >= length) {
for (size_t i = 0; i < length; i++) {
buf[i] = m_queue[i];
}
m_queue.erase(m_queue.begin(), m_queue.begin() + length);
return length;
}
lock.unlock();
boost::this_thread::sleep(boost::posix_time::milliseconds(1));
}
return err;
}
ssize_t VLCInput::read(uint8_t* buf, size_t length)
{
int bytes_per_frame = m_channels * BYTES_PER_SAMPLE;
assert(length % bytes_per_frame == 0);
ssize_t read = m_read(buf, length);
return read;
}
#endif // HAVE_VLC
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