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/*
* Copyright 2003-2020 The Music Player Daemon Project
* 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.
*/
#include "WildmidiDecoderPlugin.hxx"
#include "../DecoderAPI.hxx"
#include "tag/Handler.hxx"
#include "util/ScopeExit.hxx"
#include "util/StringFormat.hxx"
#include "fs/AllocatedPath.hxx"
#include "fs/FileSystem.hxx"
#include "fs/Path.hxx"
#include "PluginUnavailable.hxx"
extern "C" {
#include <wildmidi_lib.h>
}
static constexpr AudioFormat wildmidi_audio_format{48000, SampleFormat::S16, 2};
static bool
wildmidi_init(const ConfigBlock &block)
{
const AllocatedPath path =
block.GetPath("config_file",
"/etc/timidity/timidity.cfg");
if (!FileExists(path)) {
const auto utf8 = path.ToUTF8();
throw PluginUnavailable(StringFormat<1024>("configuration file does not exist: %s",
utf8.c_str()));
}
#ifdef LIBWILDMIDI_VERSION
/* WildMidi_ClearError() requires libwildmidi 0.4 */
WildMidi_ClearError();
AtScopeExit() { WildMidi_ClearError(); };
#endif
if (WildMidi_Init(path.c_str(), wildmidi_audio_format.sample_rate,
0) != 0) {
#ifdef LIBWILDMIDI_VERSION
/* WildMidi_GetError() requires libwildmidi 0.4 */
throw PluginUnavailable(WildMidi_GetError());
#else
throw PluginUnavailable("WildMidi_Init() failed");
#endif
}
return true;
}
static void
wildmidi_finish() noexcept
{
WildMidi_Shutdown();
}
static DecoderCommand
wildmidi_output(DecoderClient &client, midi *wm)
{
#ifdef LIBWILDMIDI_VER_MAJOR
/* WildMidi 0.4 has switched from "char*" to "int8_t*" */
int8_t buffer[4096];
#else
/* pre 0.4 */
char buffer[4096];
#endif
int length = WildMidi_GetOutput(wm, buffer, sizeof(buffer));
if (length <= 0)
return DecoderCommand::STOP;
return client.SubmitData(nullptr, buffer, length, 0);
}
static void
wildmidi_file_decode(DecoderClient &client, Path path_fs)
{
midi *wm;
const struct _WM_Info *info;
wm = WildMidi_Open(path_fs.c_str());
if (wm == nullptr)
return;
info = WildMidi_GetInfo(wm);
if (info == nullptr) {
WildMidi_Close(wm);
return;
}
const auto duration =
SongTime::FromScale<uint64_t>(info->approx_total_samples,
wildmidi_audio_format.sample_rate);
client.Ready(wildmidi_audio_format, true, duration);
DecoderCommand cmd;
do {
info = WildMidi_GetInfo(wm);
if (info == nullptr)
break;
cmd = wildmidi_output(client, wm);
if (cmd == DecoderCommand::SEEK) {
unsigned long seek_where = client.GetSeekFrame();
WildMidi_FastSeek(wm, &seek_where);
client.CommandFinished();
cmd = DecoderCommand::NONE;
}
} while (cmd == DecoderCommand::NONE);
WildMidi_Close(wm);
}
static bool
wildmidi_scan_file(Path path_fs, TagHandler &handler) noexcept
{
midi *wm = WildMidi_Open(path_fs.c_str());
if (wm == nullptr)
return false;
const struct _WM_Info *info = WildMidi_GetInfo(wm);
if (info == nullptr) {
WildMidi_Close(wm);
return false;
}
handler.OnAudioFormat(wildmidi_audio_format);
const auto duration =
SongTime::FromScale<uint64_t>(info->approx_total_samples,
wildmidi_audio_format.sample_rate);
handler.OnDuration(duration);
WildMidi_Close(wm);
return true;
}
static const char *const wildmidi_suffixes[] = {
"mid",
nullptr
};
constexpr DecoderPlugin wildmidi_decoder_plugin =
DecoderPlugin("wildmidi", wildmidi_file_decode, wildmidi_scan_file)
.WithInit(wildmidi_init, wildmidi_finish)
.WithSuffixes(wildmidi_suffixes);