Chris@148: 
Chris@148: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@148: 
Chris@148: /*
Chris@148:     Sonic Visualiser
Chris@148:     An audio file viewer and annotation editor.
Chris@148:     Centre for Digital Music, Queen Mary, University of London.
Chris@148:     This file copyright 2006 Chris Cannam.
Chris@148:     
Chris@148:     This program is free software; you can redistribute it and/or
Chris@148:     modify it under the terms of the GNU General Public License as
Chris@148:     published by the Free Software Foundation; either version 2 of the
Chris@148:     License, or (at your option) any later version.  See the file
Chris@148:     COPYING included with this distribution for more information.
Chris@148: */
Chris@148: 
Chris@148: #ifdef HAVE_MAD
Chris@148: 
Chris@148: #include "MP3FileReader.h"
Chris@150: #include "system/System.h"
Chris@148: 
Chris@148: #include <sys/types.h>
Chris@148: #include <sys/stat.h>
Chris@148: #include <fcntl.h>
Chris@148: 
Chris@148: #include <iostream>
Chris@148: 
Chris@148: #include <QApplication>
Chris@186: #include <QFileInfo>
Chris@148: #include <QProgressDialog>
Chris@148: 
Chris@263: MP3FileReader::MP3FileReader(QString path, DecodeMode decodeMode, CacheMode mode) :
Chris@148:     CodedAudioFileReader(mode),
Chris@264:     m_path(path),
Chris@264:     m_decodeThread(0)
Chris@148: {
Chris@148:     m_frameCount = 0;
Chris@148:     m_channelCount = 0;
Chris@148:     m_sampleRate = 0;
Chris@148:     m_fileSize = 0;
Chris@148:     m_bitrateNum = 0;
Chris@148:     m_bitrateDenom = 0;
Chris@148:     m_frameCount = 0;
Chris@148:     m_cancelled = false;
Chris@265:     m_completion = 0;
Chris@263:     m_done = false;
Chris@263:     m_progress = 0;
Chris@148: 
Chris@148:     struct stat stat;
Chris@148:     if (::stat(path.toLocal8Bit().data(), &stat) == -1 || stat.st_size == 0) {
Chris@148: 	m_error = QString("File %1 does not exist.").arg(path);
Chris@148: 	return;
Chris@148:     }
Chris@148: 
Chris@148:     m_fileSize = stat.st_size;
Chris@148: 
Chris@229:     int fd = -1;
Chris@231:     if ((fd = ::open(path.toLocal8Bit().data(), O_RDONLY
Chris@231: #ifdef _WIN32
Chris@231:                      | O_BINARY
Chris@231: #endif
Chris@231:                      , 0)) < 0) {
Chris@148: 	m_error = QString("Failed to open file %1 for reading.").arg(path);
Chris@148: 	return;
Chris@148:     }	
Chris@148: 
Chris@263:     m_filebuffer = 0;
Chris@148: 
Chris@148:     try {
Chris@263:         m_filebuffer = new unsigned char[m_fileSize];
Chris@148:     } catch (...) {
Chris@148:         m_error = QString("Out of memory");
Chris@148:         ::close(fd);
Chris@148: 	return;
Chris@148:     }
Chris@148:     
Chris@229:     ssize_t sz = 0;
Chris@229:     size_t offset = 0;
Chris@229:     while (offset < m_fileSize) {
Chris@263:         sz = ::read(fd, m_filebuffer + offset, m_fileSize - offset);
Chris@229:         if (sz < 0) {
Chris@231:             m_error = QString("Read error for file %1 (after %2 bytes)")
Chris@231:                 .arg(path).arg(offset);
Chris@263:             delete[] m_filebuffer;
Chris@229:             ::close(fd);
Chris@229:             return;
Chris@230:         } else if (sz == 0) {
Chris@231:             std::cerr << QString("MP3FileReader::MP3FileReader: Warning: reached EOF after only %1 of %2 bytes")
Chris@231:                 .arg(offset).arg(m_fileSize).toStdString() << std::endl;
Chris@231:             m_fileSize = offset;
Chris@230:             break;
Chris@229:         }
Chris@229:         offset += sz;
Chris@148:     }
Chris@148: 
Chris@148:     ::close(fd);
Chris@148: 
Chris@263:     if (decodeMode == DecodeAtOnce) {
Chris@263: 
Chris@148: 	m_progress = new QProgressDialog
Chris@186: 	    (QObject::tr("Decoding %1...").arg(QFileInfo(path).fileName()),
Chris@148: 	     QObject::tr("Stop"), 0, 100);
Chris@148: 	m_progress->hide();
Chris@148: 
Chris@263:         if (!decode(m_filebuffer, m_fileSize)) {
Chris@263:             m_error = QString("Failed to decode file %1.").arg(path);
Chris@263:         }
Chris@263:         
Chris@263:         delete[] m_filebuffer;
Chris@263:         m_filebuffer = 0;
Chris@148: 
Chris@263:         if (isDecodeCacheInitialised()) finishDecodeCache();
Chris@263: 
Chris@148: 	delete m_progress;
Chris@148: 	m_progress = 0;
Chris@263: 
Chris@263:     } else {
Chris@263: 
Chris@263:         m_decodeThread = new DecodeThread(this);
Chris@263:         m_decodeThread->start();
Chris@263: 
Chris@263:         while (m_channelCount == 0 && !m_done) {
Chris@263:             usleep(10);
Chris@263:         }
Chris@148:     }
Chris@148: }
Chris@148: 
Chris@148: MP3FileReader::~MP3FileReader()
Chris@148: {
Chris@263:     if (m_decodeThread) {
Chris@265:         m_cancelled = true;
Chris@263:         m_decodeThread->wait();
Chris@263:         delete m_decodeThread;
Chris@263:     }
Chris@148: }
Chris@148: 
Chris@263: void
Chris@263: MP3FileReader::DecodeThread::run()
Chris@263: {
Chris@263:     if (!m_reader->decode(m_reader->m_filebuffer, m_reader->m_fileSize)) {
Chris@263:         m_reader->m_error = QString("Failed to decode file %1.").arg(m_reader->m_path);
Chris@263:     }
Chris@263: 
Chris@263:     delete[] m_reader->m_filebuffer;
Chris@263:     m_reader->m_filebuffer = 0;
Chris@263:     
Chris@263:     if (m_reader->isDecodeCacheInitialised()) m_reader->finishDecodeCache();
Chris@263: 
Chris@263:     m_reader->m_done = true;
Chris@265:     m_reader->m_completion = 100;
Chris@263: } 
Chris@263: 
Chris@148: bool
Chris@148: MP3FileReader::decode(void *mm, size_t sz)
Chris@148: {
Chris@148:     DecoderData data;
Chris@148:     struct mad_decoder decoder;
Chris@148: 
Chris@148:     data.start = (unsigned char const *)mm;
Chris@148:     data.length = (unsigned long)sz;
Chris@148:     data.reader = this;
Chris@148: 
Chris@148:     mad_decoder_init(&decoder, &data, input, 0, 0, output, error, 0);
Chris@148:     mad_decoder_run(&decoder, MAD_DECODER_MODE_SYNC);
Chris@148:     mad_decoder_finish(&decoder);
Chris@148: 
Chris@263:     m_done = true;
Chris@148:     return true;
Chris@148: }
Chris@148: 
Chris@148: enum mad_flow
Chris@148: MP3FileReader::input(void *dp, struct mad_stream *stream)
Chris@148: {
Chris@148:     DecoderData *data = (DecoderData *)dp;
Chris@148: 
Chris@148:     if (!data->length) return MAD_FLOW_STOP;
Chris@148:     mad_stream_buffer(stream, data->start, data->length);
Chris@148:     data->length = 0;
Chris@148: 
Chris@148:     return MAD_FLOW_CONTINUE;
Chris@148: }
Chris@148: 
Chris@148: enum mad_flow
Chris@148: MP3FileReader::output(void *dp,
Chris@148: 		      struct mad_header const *header,
Chris@148: 		      struct mad_pcm *pcm)
Chris@148: {
Chris@148:     DecoderData *data = (DecoderData *)dp;
Chris@148:     return data->reader->accept(header, pcm);
Chris@148: }
Chris@148: 
Chris@148: enum mad_flow
Chris@148: MP3FileReader::accept(struct mad_header const *header,
Chris@148: 		      struct mad_pcm *pcm)
Chris@148: {
Chris@148:     int channels = pcm->channels;
Chris@148:     int frames = pcm->length;
Chris@148: 
Chris@148:     if (header) {
Chris@148:         m_bitrateNum += header->bitrate;
Chris@148:         m_bitrateDenom ++;
Chris@148:     }
Chris@148: 
Chris@148:     if (frames < 1) return MAD_FLOW_CONTINUE;
Chris@148: 
Chris@148:     if (m_channelCount == 0) {
Chris@148:         m_channelCount = channels;
Chris@148:         m_sampleRate = pcm->samplerate;
Chris@148:     }
Chris@148:     
Chris@148:     if (m_bitrateDenom > 0) {
Chris@148:         double bitrate = m_bitrateNum / m_bitrateDenom;
Chris@148:         double duration = double(m_fileSize * 8) / bitrate;
Chris@148:         double elapsed = double(m_frameCount) / m_sampleRate;
Chris@148:         double percent = ((elapsed * 100.0) / duration);
Chris@265:         int progress = int(percent);
Chris@265:         if (progress < 1) progress = 1;
Chris@265:         if (progress > 99) progress = 99;
Chris@265:         m_completion = progress;
Chris@263:         if (m_progress) {
Chris@263:             if (progress > m_progress->value()) {
Chris@263:                 m_progress->setValue(progress);
Chris@263:                 m_progress->show();
Chris@263:                 m_progress->raise();
Chris@263:                 qApp->processEvents();
Chris@263:                 if (m_progress->wasCanceled()) {
Chris@263:                     m_cancelled = true;
Chris@263:                 }
Chris@148:             }
Chris@148:         }
Chris@148:     }
Chris@148: 
Chris@148:     if (m_cancelled) return MAD_FLOW_STOP;
Chris@148: 
Chris@148:     m_frameCount += frames;
Chris@148: 
Chris@148:     if (!isDecodeCacheInitialised()) {
Chris@148:         initialiseDecodeCache();
Chris@148:     }
Chris@148: 
Chris@148:     for (int i = 0; i < frames; ++i) {
Chris@148: 
Chris@148: 	for (int ch = 0; ch < channels; ++ch) {
Chris@148: 	    mad_fixed_t sample = 0;
Chris@148: 	    if (ch < int(sizeof(pcm->samples) / sizeof(pcm->samples[0]))) {
Chris@148: 		sample = pcm->samples[ch][i];
Chris@148: 	    }
Chris@148: 	    float fsample = float(sample) / float(MAD_F_ONE);
Chris@148:             addSampleToDecodeCache(fsample);
Chris@148: 	}
Chris@148: 
Chris@148: 	if (! (i & 0xffff)) {
Chris@148: 	    // periodically munlock to ensure we don't exhaust real memory
Chris@148: 	    // if running with memory locked down
Chris@148: 	    MUNLOCK_SAMPLEBLOCK(m_data);
Chris@148: 	}
Chris@148:     }
Chris@148: 
Chris@148:     if (frames > 0) {
Chris@148: 	MUNLOCK_SAMPLEBLOCK(m_data);
Chris@148:     }
Chris@148: 
Chris@148:     return MAD_FLOW_CONTINUE;
Chris@148: }
Chris@148: 
Chris@148: enum mad_flow
Chris@148: MP3FileReader::error(void *dp,
Chris@148: 		     struct mad_stream *stream,
Chris@148: 		     struct mad_frame *)
Chris@148: {
Chris@148:     DecoderData *data = (DecoderData *)dp;
Chris@148: 
Chris@148:     fprintf(stderr, "decoding error 0x%04x (%s) at byte offset %u\n",
Chris@148: 	    stream->error, mad_stream_errorstr(stream),
Chris@148: 	    stream->this_frame - data->start);
Chris@148: 
Chris@148:     return MAD_FLOW_CONTINUE;
Chris@148: }
Chris@148: 
Chris@157: void
Chris@157: MP3FileReader::getSupportedExtensions(std::set<QString> &extensions)
Chris@157: {
Chris@157:     extensions.insert("mp3");
Chris@157: }
Chris@157: 
Chris@148: #endif