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239 lines
6 KiB
C++
239 lines
6 KiB
C++
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/*
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** mpg123_decoder.cpp
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**
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**---------------------------------------------------------------------------
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** Copyright 2008-2010 Chris Robinson
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** All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions
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** are met:
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**
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** 1. Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** 2. Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in the
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** documentation and/or other materials provided with the distribution.
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** 3. The name of the author may not be used to endorse or promote products
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** derived from this software without specific prior written permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**---------------------------------------------------------------------------
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**
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*/
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#include <algorithm>
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#include <stdio.h>
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#include "mpg123_decoder.h"
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#include "i_module.h"
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#ifdef HAVE_MPG123
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FModule MPG123Module{"MPG123"};
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#include "mpgload.h"
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#ifdef _WIN32
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#define MPG123LIB "libmpg123-0.dll"
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#elif defined(__APPLE__)
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#define MPG123LIB "libmpg123.0.dylib"
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#else
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#define MPG123LIB "libmpg123.so.0"
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#endif
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bool IsMPG123Present()
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{
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#if !defined DYN_MPG123
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return true;
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#else
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static bool cached_result = false;
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static bool done = false;
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if (!done)
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{
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done = true;
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auto abspath = module_progdir + "/" MPG123LIB;
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cached_result = MPG123Module.Load({abspath.c_str(), MPG123LIB});
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}
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return cached_result;
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#endif
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}
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static bool inited = false;
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off_t MPG123Decoder::file_lseek(void *handle, off_t offset, int whence)
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{
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auto &reader = reinterpret_cast<MPG123Decoder*>(handle)->Reader;
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if(whence == SEEK_CUR)
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{
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if(offset < 0 && reader->tell()+offset < 0)
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return -1;
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}
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else if(whence == SEEK_END)
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{
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if(offset < 0 && reader->filelength() + offset < 0)
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return -1;
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}
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if(reader->seek(offset, whence) != 0)
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return -1;
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return (off_t)reader->tell();
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}
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ssize_t MPG123Decoder::file_read(void *handle, void *buffer, size_t bytes)
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{
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auto &reader = reinterpret_cast<MPG123Decoder*>(handle)->Reader;
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return (ssize_t)reader->read(buffer, (long)bytes);
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}
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MPG123Decoder::~MPG123Decoder()
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{
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if(MPG123)
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{
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mpg123_close(MPG123);
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mpg123_delete(MPG123);
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MPG123 = 0;
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}
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if (Reader) Reader->close();
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Reader = nullptr;
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}
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bool MPG123Decoder::open(MusicIO::FileInterface *reader)
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{
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if(!inited)
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{
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if (!IsMPG123Present()) return false;
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if(mpg123_init() != MPG123_OK) return false;
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inited = true;
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}
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Reader = reader;
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{
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MPG123 = mpg123_new(NULL, NULL);
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if(mpg123_replace_reader_handle(MPG123, file_read, file_lseek, NULL) == MPG123_OK &&
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mpg123_open_handle(MPG123, this) == MPG123_OK)
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{
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int enc, channels;
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long srate;
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if(mpg123_getformat(MPG123, &srate, &channels, &enc) == MPG123_OK)
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{
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if((channels == 1 || channels == 2) && srate > 0 &&
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mpg123_format_none(MPG123) == MPG123_OK &&
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mpg123_format(MPG123, srate, channels, MPG123_ENC_SIGNED_16) == MPG123_OK)
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{
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// All OK
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Done = false;
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return true;
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}
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}
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mpg123_close(MPG123);
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}
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mpg123_delete(MPG123);
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MPG123 = 0;
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}
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Reader = nullptr; // need to give it back.
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return false;
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}
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void MPG123Decoder::getInfo(int *samplerate, ChannelConfig *chans, SampleType *type)
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{
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int enc = 0, channels = 0;
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long srate = 0;
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mpg123_getformat(MPG123, &srate, &channels, &enc);
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*samplerate = srate;
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if(channels == 2)
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*chans = ChannelConfig_Stereo;
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else
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*chans = ChannelConfig_Mono;
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*type = SampleType_Int16;
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}
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size_t MPG123Decoder::read(char *buffer, size_t bytes)
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{
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size_t amt = 0;
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while(!Done && bytes > 0)
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{
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size_t got = 0;
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int ret = mpg123_read(MPG123, (unsigned char*)buffer, bytes, &got);
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bytes -= got;
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buffer += got;
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amt += got;
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if(ret == MPG123_NEW_FORMAT || ret == MPG123_DONE || got == 0)
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{
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Done = true;
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break;
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}
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}
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return amt;
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}
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bool MPG123Decoder::seek(size_t ms_offset, bool ms, bool mayrestart)
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{
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int enc, channels;
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long srate;
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if (!mayrestart || ms_offset > 0)
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{
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if (mpg123_getformat(MPG123, &srate, &channels, &enc) == MPG123_OK)
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{
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size_t smp_offset = ms ? (size_t)((double)ms_offset / 1000. * srate) : ms_offset;
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if (mpg123_seek(MPG123, (off_t)smp_offset, SEEK_SET) >= 0)
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{
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Done = false;
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return true;
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}
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}
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return false;
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}
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else
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{
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// Restart the song instead of rewinding. A rewind seems to cause distortion when done repeatedly.
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// offset is intentionally ignored here.
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if (MPG123)
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{
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mpg123_close(MPG123);
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mpg123_delete(MPG123);
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MPG123 = 0;
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}
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Reader->seek(0, SEEK_SET);
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// Do not call open with our own reader variable, that would be catastrophic.
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auto reader = std::move(Reader);
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return open(reader);
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}
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}
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size_t MPG123Decoder::getSampleOffset()
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{
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return mpg123_tell(MPG123);
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}
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size_t MPG123Decoder::getSampleLength()
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{
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off_t len = mpg123_length(MPG123);
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return (len > 0) ? len : 0;
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}
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#endif
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