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@148: #include "base/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@148: #include <QProgressDialog>
Chris@148: 
Chris@148: MP3FileReader::MP3FileReader(QString path, bool showProgress, CacheMode mode) :
Chris@148:     CodedAudioFileReader(mode),
Chris@148:     m_path(path)
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@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@148:     int fd;
Chris@148:     if ((fd = ::open(path.toLocal8Bit().data(), O_RDONLY, 0)) < 0) {
Chris@148: 	m_error = QString("Failed to open file %1 for reading.").arg(path);
Chris@148: 	return;
Chris@148:     }	
Chris@148: 
Chris@148:     unsigned char *filebuffer = 0;
Chris@148: 
Chris@148:     try {
Chris@148:         filebuffer = new unsigned char[stat.st_size];
Chris@148:     } catch (...) {
Chris@148:         m_error = QString("Out of memory");
Chris@148:         ::close(fd);
Chris@148: 	return;
Chris@148:     }
Chris@148:     
Chris@148:     if (::read(fd, filebuffer, stat.st_size) < stat.st_size) {
Chris@148: 	m_error = QString("Failed to read file %1.").arg(path);
Chris@148:         delete[] filebuffer;
Chris@148:         ::close(fd);
Chris@148: 	return;
Chris@148:     }
Chris@148: 
Chris@148:     ::close(fd);
Chris@148: 
Chris@148:     if (showProgress) {
Chris@148: 	m_progress = new QProgressDialog
Chris@148: 	    (QObject::tr("Decoding MP3 file..."),
Chris@148: 	     QObject::tr("Stop"), 0, 100);
Chris@148: 	m_progress->hide();
Chris@148:     }
Chris@148: 
Chris@148:     if (!decode(filebuffer, stat.st_size)) {
Chris@148: 	m_error = QString("Failed to decode file %1.").arg(path);
Chris@148:         delete[] filebuffer;
Chris@148: 	return;
Chris@148:     }
Chris@148:     
Chris@148:     if (isDecodeCacheInitialised()) finishDecodeCache();
Chris@148: 
Chris@148:     if (showProgress) {
Chris@148: 	delete m_progress;
Chris@148: 	m_progress = 0;
Chris@148:     }
Chris@148: 
Chris@148:     delete[] filebuffer;
Chris@148: }
Chris@148: 
Chris@148: MP3FileReader::~MP3FileReader()
Chris@148: {
Chris@148: }
Chris@148: 
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@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@148:         int progress = int(percent);
Chris@148:         if (progress < 1) progress = 1;
Chris@148:         if (progress > 99) progress = 99;
Chris@148:         if (progress > m_progress->value()) {
Chris@148:             m_progress->setValue(progress);
Chris@148:             m_progress->show();
Chris@148:             m_progress->raise();
Chris@148:             qApp->processEvents();
Chris@148:             if (m_progress->wasCanceled()) {
Chris@148:                 m_cancelled = true;
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@148: #endif