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91 lines
2.8 KiB
91 lines
2.8 KiB
// The contents of this file are in the public domain. See LICENSE_FOR_EXAMPLE_PROGRAMS.txt
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/*
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This is an example illustrating the use of the ffmpeg wrappers.
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It attempts to read audio from a microphone if available, and saves the audio to wav.
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*/
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#include <iostream>
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#include <chrono>
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#include <dlib/media.h>
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#include <dlib/cmd_line_parser.h>
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using namespace std;
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using namespace std::chrono;
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using namespace std::chrono_literals;
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using namespace dlib;
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using namespace dlib::ffmpeg;
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int main(const int argc, const char** argv)
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try
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{
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command_line_parser parser;
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parser.add_option("t", "capture time in seconds", 1);
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parser.add_option("i", "input microphone device. E.g. hw:0,0", 1);
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parser.add_option("o", "output audio file. E.g. recording.m4a, recording.wav. Default: recording.m4a", 1);
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parser.add_option("codec", "audio codec. E.g. `aac`, `pcm_s16le`. Recommend `pcm_s16le` for WAV files and `aac` for `M4A` files. Default: `aac`", 1);
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parser.set_group_name("Help Options");
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parser.add_option("h", "alias of --help");
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parser.add_option("help", "display this message and exit");
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parser.parse(argc, argv);
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const char* one_time_opts[] = {"t", "i", "o", "codec"};
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parser.check_one_time_options(one_time_opts);
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if (parser.option("h") || parser.option("help"))
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{
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parser.print_options();
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return 0;
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}
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const seconds time{get_option(parser, "t", 1)};
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const std::string device = get_option(parser, "i", "hw:0,0");
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const std::string filename = get_option(parser, "o", "recording.m4a");
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const std::string codec = get_option(parser, "codec", "aac");
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// Open microphone
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demuxer cap([&] {
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demuxer::args args;
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args.filepath = device;
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args.input_format = "alsa";
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return args;
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}());
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if (!cap.is_open())
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{
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cout << "Failed to open device: " << device << '\n';
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return EXIT_FAILURE;
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}
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// Create WAV file
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muxer writer([&] {
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muxer::args args;
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args.filepath = filename;
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args.enable_image = false;
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args.args_audio.codec_name = codec;
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args.args_audio.sample_rate = cap.sample_rate();
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args.args_audio.channel_layout = cap.channel_layout();
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args.args_audio.fmt = cap.sample_fmt();
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return args;
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}());
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if (!writer.is_open())
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{
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cout << "Failed to open wav file" << endl;
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return EXIT_FAILURE;
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}
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// Pull and push
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const auto start = high_resolution_clock::now();
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frame f;
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while (cap.read(f) && (high_resolution_clock::now() - start) < time)
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writer.push(std::move(f));
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return EXIT_SUCCESS;
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}
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catch (const std::exception& e)
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{
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printf("%s\n", e.what());
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return EXIT_FAILURE;
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} |