annotate data/fileio/MP3FileReader.cpp @ 152:21792a550ec9 last-cc-copyright

* Move the current DenseThreeDimensionalModel to EditableDenseThreeDimensionalModel (wow!), and make DTDM an abstract base * Move FFTFuzzyAdapter to FFTModel as a new subclass of DTDM
author Chris Cannam
date Mon, 31 Jul 2006 17:05:18 +0000
parents 4b2ea82fd0ed
children c03ec31005e1
rev   line source
Chris@148 1
Chris@148 2 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
Chris@148 3
Chris@148 4 /*
Chris@148 5 Sonic Visualiser
Chris@148 6 An audio file viewer and annotation editor.
Chris@148 7 Centre for Digital Music, Queen Mary, University of London.
Chris@148 8 This file copyright 2006 Chris Cannam.
Chris@148 9
Chris@148 10 This program is free software; you can redistribute it and/or
Chris@148 11 modify it under the terms of the GNU General Public License as
Chris@148 12 published by the Free Software Foundation; either version 2 of the
Chris@148 13 License, or (at your option) any later version. See the file
Chris@148 14 COPYING included with this distribution for more information.
Chris@148 15 */
Chris@148 16
Chris@148 17 #ifdef HAVE_MAD
Chris@148 18
Chris@148 19 #include "MP3FileReader.h"
Chris@150 20 #include "system/System.h"
Chris@148 21
Chris@148 22 #include <sys/types.h>
Chris@148 23 #include <sys/stat.h>
Chris@148 24 #include <fcntl.h>
Chris@148 25
Chris@148 26 #include <iostream>
Chris@148 27
Chris@148 28 #include <QApplication>
Chris@148 29 #include <QProgressDialog>
Chris@148 30
Chris@148 31 MP3FileReader::MP3FileReader(QString path, bool showProgress, CacheMode mode) :
Chris@148 32 CodedAudioFileReader(mode),
Chris@148 33 m_path(path)
Chris@148 34 {
Chris@148 35 m_frameCount = 0;
Chris@148 36 m_channelCount = 0;
Chris@148 37 m_sampleRate = 0;
Chris@148 38 m_fileSize = 0;
Chris@148 39 m_bitrateNum = 0;
Chris@148 40 m_bitrateDenom = 0;
Chris@148 41 m_frameCount = 0;
Chris@148 42 m_cancelled = false;
Chris@148 43
Chris@148 44 struct stat stat;
Chris@148 45 if (::stat(path.toLocal8Bit().data(), &stat) == -1 || stat.st_size == 0) {
Chris@148 46 m_error = QString("File %1 does not exist.").arg(path);
Chris@148 47 return;
Chris@148 48 }
Chris@148 49
Chris@148 50 m_fileSize = stat.st_size;
Chris@148 51
Chris@148 52 int fd;
Chris@148 53 if ((fd = ::open(path.toLocal8Bit().data(), O_RDONLY, 0)) < 0) {
Chris@148 54 m_error = QString("Failed to open file %1 for reading.").arg(path);
Chris@148 55 return;
Chris@148 56 }
Chris@148 57
Chris@148 58 unsigned char *filebuffer = 0;
Chris@148 59
Chris@148 60 try {
Chris@148 61 filebuffer = new unsigned char[stat.st_size];
Chris@148 62 } catch (...) {
Chris@148 63 m_error = QString("Out of memory");
Chris@148 64 ::close(fd);
Chris@148 65 return;
Chris@148 66 }
Chris@148 67
Chris@148 68 if (::read(fd, filebuffer, stat.st_size) < stat.st_size) {
Chris@148 69 m_error = QString("Failed to read file %1.").arg(path);
Chris@148 70 delete[] filebuffer;
Chris@148 71 ::close(fd);
Chris@148 72 return;
Chris@148 73 }
Chris@148 74
Chris@148 75 ::close(fd);
Chris@148 76
Chris@148 77 if (showProgress) {
Chris@148 78 m_progress = new QProgressDialog
Chris@148 79 (QObject::tr("Decoding MP3 file..."),
Chris@148 80 QObject::tr("Stop"), 0, 100);
Chris@148 81 m_progress->hide();
Chris@148 82 }
Chris@148 83
Chris@148 84 if (!decode(filebuffer, stat.st_size)) {
Chris@148 85 m_error = QString("Failed to decode file %1.").arg(path);
Chris@148 86 delete[] filebuffer;
Chris@148 87 return;
Chris@148 88 }
Chris@148 89
Chris@148 90 if (isDecodeCacheInitialised()) finishDecodeCache();
Chris@148 91
Chris@148 92 if (showProgress) {
Chris@148 93 delete m_progress;
Chris@148 94 m_progress = 0;
Chris@148 95 }
Chris@148 96
Chris@148 97 delete[] filebuffer;
Chris@148 98 }
Chris@148 99
Chris@148 100 MP3FileReader::~MP3FileReader()
Chris@148 101 {
Chris@148 102 }
Chris@148 103
Chris@148 104 bool
Chris@148 105 MP3FileReader::decode(void *mm, size_t sz)
Chris@148 106 {
Chris@148 107 DecoderData data;
Chris@148 108 struct mad_decoder decoder;
Chris@148 109
Chris@148 110 data.start = (unsigned char const *)mm;
Chris@148 111 data.length = (unsigned long)sz;
Chris@148 112 data.reader = this;
Chris@148 113
Chris@148 114 mad_decoder_init(&decoder, &data, input, 0, 0, output, error, 0);
Chris@148 115 mad_decoder_run(&decoder, MAD_DECODER_MODE_SYNC);
Chris@148 116 mad_decoder_finish(&decoder);
Chris@148 117
Chris@148 118 return true;
Chris@148 119 }
Chris@148 120
Chris@148 121 enum mad_flow
Chris@148 122 MP3FileReader::input(void *dp, struct mad_stream *stream)
Chris@148 123 {
Chris@148 124 DecoderData *data = (DecoderData *)dp;
Chris@148 125
Chris@148 126 if (!data->length) return MAD_FLOW_STOP;
Chris@148 127 mad_stream_buffer(stream, data->start, data->length);
Chris@148 128 data->length = 0;
Chris@148 129
Chris@148 130 return MAD_FLOW_CONTINUE;
Chris@148 131 }
Chris@148 132
Chris@148 133 enum mad_flow
Chris@148 134 MP3FileReader::output(void *dp,
Chris@148 135 struct mad_header const *header,
Chris@148 136 struct mad_pcm *pcm)
Chris@148 137 {
Chris@148 138 DecoderData *data = (DecoderData *)dp;
Chris@148 139 return data->reader->accept(header, pcm);
Chris@148 140 }
Chris@148 141
Chris@148 142 enum mad_flow
Chris@148 143 MP3FileReader::accept(struct mad_header const *header,
Chris@148 144 struct mad_pcm *pcm)
Chris@148 145 {
Chris@148 146 int channels = pcm->channels;
Chris@148 147 int frames = pcm->length;
Chris@148 148
Chris@148 149 if (header) {
Chris@148 150 m_bitrateNum += header->bitrate;
Chris@148 151 m_bitrateDenom ++;
Chris@148 152 }
Chris@148 153
Chris@148 154 if (frames < 1) return MAD_FLOW_CONTINUE;
Chris@148 155
Chris@148 156 if (m_channelCount == 0) {
Chris@148 157 m_channelCount = channels;
Chris@148 158 m_sampleRate = pcm->samplerate;
Chris@148 159 }
Chris@148 160
Chris@148 161 if (m_bitrateDenom > 0) {
Chris@148 162 double bitrate = m_bitrateNum / m_bitrateDenom;
Chris@148 163 double duration = double(m_fileSize * 8) / bitrate;
Chris@148 164 double elapsed = double(m_frameCount) / m_sampleRate;
Chris@148 165 double percent = ((elapsed * 100.0) / duration);
Chris@148 166 int progress = int(percent);
Chris@148 167 if (progress < 1) progress = 1;
Chris@148 168 if (progress > 99) progress = 99;
Chris@148 169 if (progress > m_progress->value()) {
Chris@148 170 m_progress->setValue(progress);
Chris@148 171 m_progress->show();
Chris@148 172 m_progress->raise();
Chris@148 173 qApp->processEvents();
Chris@148 174 if (m_progress->wasCanceled()) {
Chris@148 175 m_cancelled = true;
Chris@148 176 }
Chris@148 177 }
Chris@148 178 }
Chris@148 179
Chris@148 180 if (m_cancelled) return MAD_FLOW_STOP;
Chris@148 181
Chris@148 182 m_frameCount += frames;
Chris@148 183
Chris@148 184 if (!isDecodeCacheInitialised()) {
Chris@148 185 initialiseDecodeCache();
Chris@148 186 }
Chris@148 187
Chris@148 188 for (int i = 0; i < frames; ++i) {
Chris@148 189
Chris@148 190 for (int ch = 0; ch < channels; ++ch) {
Chris@148 191 mad_fixed_t sample = 0;
Chris@148 192 if (ch < int(sizeof(pcm->samples) / sizeof(pcm->samples[0]))) {
Chris@148 193 sample = pcm->samples[ch][i];
Chris@148 194 }
Chris@148 195 float fsample = float(sample) / float(MAD_F_ONE);
Chris@148 196 addSampleToDecodeCache(fsample);
Chris@148 197 }
Chris@148 198
Chris@148 199 if (! (i & 0xffff)) {
Chris@148 200 // periodically munlock to ensure we don't exhaust real memory
Chris@148 201 // if running with memory locked down
Chris@148 202 MUNLOCK_SAMPLEBLOCK(m_data);
Chris@148 203 }
Chris@148 204 }
Chris@148 205
Chris@148 206 if (frames > 0) {
Chris@148 207 MUNLOCK_SAMPLEBLOCK(m_data);
Chris@148 208 }
Chris@148 209
Chris@148 210 return MAD_FLOW_CONTINUE;
Chris@148 211 }
Chris@148 212
Chris@148 213 enum mad_flow
Chris@148 214 MP3FileReader::error(void *dp,
Chris@148 215 struct mad_stream *stream,
Chris@148 216 struct mad_frame *)
Chris@148 217 {
Chris@148 218 DecoderData *data = (DecoderData *)dp;
Chris@148 219
Chris@148 220 fprintf(stderr, "decoding error 0x%04x (%s) at byte offset %u\n",
Chris@148 221 stream->error, mad_stream_errorstr(stream),
Chris@148 222 stream->this_frame - data->start);
Chris@148 223
Chris@148 224 return MAD_FLOW_CONTINUE;
Chris@148 225 }
Chris@148 226
Chris@148 227 #endif