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// The contents of this file are in the public domain. See LICENSE_FOR_EXAMPLE_PROGRAMS.txt
/*
This is an example illustrating the use of the ffmpeg wrappers.
It attempts to read audio from a microphone if available, and saves the audio to wav.
*/
#include <iostream>
#include <chrono>
#include <dlib/media.h>
#include <dlib/cmd_line_parser.h>
using namespace std;
using namespace std::chrono;
using namespace std::chrono_literals;
using namespace dlib;
using namespace dlib::ffmpeg;
int main(const int argc, const char** argv)
try
{
command_line_parser parser;
parser.add_option("i", "input audio file", 1);
parser.add_option("o", "output audio device (speaker). E.g. hw:0,0", 1);
parser.add_option("codec", "audio codec. E.g. pcm_s16le", 1);
parser.set_group_name("Help Options");
parser.add_option("h", "alias of --help");
parser.add_option("help", "display this message and exit");
parser.parse(argc, argv);
const char* one_time_opts[] = {"i", "o", "codec"};
parser.check_one_time_options(one_time_opts);
if (parser.option("h") || parser.option("help"))
{
parser.print_options();
return 0;
}
const std::string filename = get_option(parser, "i", "");
const std::string device = get_option(parser, "o", "hw:0,0");
const std::string codec = get_option(parser, "codec", "");
if (device.empty())
{
cout << "Didn't find a speaker. Exiting.\n";
return EXIT_FAILURE;
}
// Open file
demuxer cap({filename, video_disabled, audio_enabled});
if (!cap.is_open())
{
cout << "Failed to open " << device << endl;
return EXIT_FAILURE;
}
// Create writer to speaker
muxer writer([&] {
muxer::args args;
args.filepath = device;
args.output_format = "alsa";
args.enable_image = false;
args.args_audio.codec_name = codec;
args.args_audio.sample_rate = 44100;
args.args_audio.channel_layout = AV_CH_LAYOUT_STEREO;
args.args_audio.fmt = cap.sample_fmt();
return args;
}());
if (!writer.is_open())
{
cout << "Failed to open wav file" << endl;
return EXIT_FAILURE;
}
// Pull and push
frame f;
while (cap.read(f))
writer.push(std::move(f));
return EXIT_SUCCESS;
}
catch (const std::exception& e)
{
printf("%s\n", e.what());
return EXIT_FAILURE;
}
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