run_convert.cxx 2.47 KB
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/*
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 * Copyright 2003-2018 The Music Player Daemon Project
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 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

/*
 * This program is a command line interface to MPD's PCM conversion
 * library (pcm_convert.c).
 *
 */

#include "config.h"
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#include "AudioParser.hxx"
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#include "AudioFormat.hxx"
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#include "pcm/PcmConvert.hxx"
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#include "util/ConstBuffer.hxx"
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#include "util/StaticFifoBuffer.hxx"
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#include "util/PrintException.hxx"
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#include <assert.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>

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int
main(int argc, char **argv)
try {
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	if (argc != 3) {
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		fprintf(stderr,
			"Usage: run_convert IN_FORMAT OUT_FORMAT <IN >OUT\n");
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		return 1;
	}

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	const auto in_audio_format = ParseAudioFormat(argv[1], false);
	const auto out_audio_format_mask = ParseAudioFormat(argv[2], false);
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	const auto out_audio_format =
		in_audio_format.WithMask(out_audio_format_mask);
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	const size_t in_frame_size = in_audio_format.GetFrameSize();
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	PcmConvert state;
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	state.Open(in_audio_format, out_audio_format);
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	StaticFifoBuffer<uint8_t, 4096> buffer;
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	while (true) {
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		{
			const auto dest = buffer.Write();
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			assert(!dest.empty());
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			ssize_t nbytes = read(0, dest.data, dest.size);
			if (nbytes <= 0)
				break;
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			buffer.Append(nbytes);
		}
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		auto src = buffer.Read();
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		assert(!src.empty());
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		src.size -= src.size % in_frame_size;
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		if (src.empty())
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			continue;

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		buffer.Consume(src.size);
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		auto output = state.Convert({src.data, src.size});
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		gcc_unused ssize_t ignored = write(1, output.data,
						   output.size);
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	}

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	while (true) {
		auto output = state.Flush();
		if (output.IsNull())
			break;

		gcc_unused ssize_t ignored = write(1, output.data,
						   output.size);
	}

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	state.Close();

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	return EXIT_SUCCESS;
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} catch (...) {
	PrintException(std::current_exception());
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	return EXIT_FAILURE;
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}