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@392: #include "base/ProgressReporter.h"
Chris@357: 
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@405: #include <cstdlib>
Chris@405: 
Chris@271: #ifdef HAVE_ID3TAG
Chris@271: #include <id3tag.h>
Chris@271: #endif
Chris@1168: 
Chris@1364: #ifdef _WIN32
Chris@1364: #include <io.h>
Chris@1364: #include <fcntl.h>
Chris@1364: #else
Chris@1364: #include <fcntl.h>
Chris@1364: #include <unistd.h>
Chris@1364: #endif
Chris@1364: 
Chris@186: #include <QFileInfo>
Chris@148: 
Chris@1346: #include <QTextCodec>
Chris@1346: 
Chris@1305: using std::string;
Chris@1305: 
Chris@1305: static sv_frame_t DEFAULT_DECODER_DELAY = 529;
Chris@1305: 
Chris@317: MP3FileReader::MP3FileReader(FileSource source, DecodeMode decodeMode, 
Chris@1305:                              CacheMode mode, GaplessMode gaplessMode,
Chris@1305:                              sv_samplerate_t targetRate,
Chris@920:                              bool normalised,
Chris@392:                              ProgressReporter *reporter) :
Chris@920:     CodedAudioFileReader(mode, targetRate, normalised),
Chris@316:     m_source(source),
Chris@316:     m_path(source.getLocalFilename()),
Chris@1305:     m_gaplessMode(gaplessMode),
Chris@1284:     m_decodeErrorShown(false),
Chris@1582:     m_decodeThread(nullptr)
Chris@148: {
Chris@1279:     SVDEBUG << "MP3FileReader: local path: \"" << m_path
Chris@1279:             << "\", decode mode: " << decodeMode << " ("
Chris@1279:             << (decodeMode == DecodeAtOnce ? "DecodeAtOnce" : "DecodeThreaded")
Chris@1279:             << ")" << endl;
Chris@1279:     
Chris@148:     m_channelCount = 0;
Chris@297:     m_fileRate = 0;
Chris@148:     m_fileSize = 0;
Chris@148:     m_bitrateNum = 0;
Chris@148:     m_bitrateDenom = 0;
Chris@148:     m_cancelled = false;
Chris@1288:     m_mp3FrameCount = 0;
Chris@265:     m_completion = 0;
Chris@263:     m_done = false;
Chris@392:     m_reporter = reporter;
Chris@148: 
Chris@1313:     if (m_gaplessMode == GaplessMode::Gapless) {
Chris@1307:         CodedAudioFileReader::setFramesToTrim(DEFAULT_DECODER_DELAY, 0);
Chris@1305:     }
Chris@1305:     
Chris@1348:     m_fileSize = 0;
Chris@148: 
Chris@1582:     m_fileBuffer = nullptr;
Chris@1290:     m_fileBufferSize = 0;
Chris@1290: 
Chris@1582:     m_sampleBuffer = nullptr;
Chris@1290:     m_sampleBufferSize = 0;
Chris@977: 
Chris@1348:     QFile qfile(m_path);
Chris@1348:     if (!qfile.open(QIODevice::ReadOnly)) {
Chris@1342:         m_error = QString("Failed to open file %1 for reading.").arg(m_path);
Chris@1342:         SVDEBUG << "MP3FileReader: " << m_error << endl;
Chris@1342:         return;
Chris@1343:     }   
Chris@148: 
Chris@1348:     m_fileSize = qfile.size();
Chris@1348:     
Chris@148:     try {
Chris@1290:         // We need a mysterious MAD_BUFFER_GUARD (== 8) zero bytes at
Chris@1290:         // end of input, to ensure libmad decodes the last frame
Chris@1290:         // correctly. Otherwise the decoded audio is truncated.
Chris@1401:         SVDEBUG << "file size = " << m_fileSize << ", buffer guard = " << MAD_BUFFER_GUARD << endl;
Chris@1290:         m_fileBufferSize = m_fileSize + MAD_BUFFER_GUARD;
Chris@1290:         m_fileBuffer = new unsigned char[m_fileBufferSize];
Chris@1290:         memset(m_fileBuffer + m_fileSize, 0, MAD_BUFFER_GUARD);
Chris@148:     } catch (...) {
Chris@290:         m_error = QString("Out of memory");
Chris@1342:         SVDEBUG << "MP3FileReader: " << m_error << endl;
Chris@1342:         return;
Chris@148:     }
Chris@1348: 
Chris@1348:     auto amountRead = qfile.read(reinterpret_cast<char *>(m_fileBuffer),
Chris@1348:                                  m_fileSize);
Chris@1348: 
Chris@1348:     if (amountRead < m_fileSize) {
Chris@1348:         SVCERR << QString("MP3FileReader::MP3FileReader: Warning: reached EOF after only %1 of %2 bytes")
Chris@1348:             .arg(amountRead).arg(m_fileSize) << endl;
Chris@1348:         memset(m_fileBuffer + amountRead, 0, m_fileSize - amountRead);
Chris@1348:         m_fileSize = amountRead;
Chris@148:     }
Chris@1348:         
Chris@1348:     loadTags(qfile.handle());
Chris@148: 
Chris@1348:     qfile.close();
Chris@271: 
Chris@263:     if (decodeMode == DecodeAtOnce) {
Chris@263: 
Chris@392:         if (m_reporter) {
Chris@392:             connect(m_reporter, SIGNAL(cancelled()), this, SLOT(cancelled()));
Chris@392:             m_reporter->setMessage
Chris@392:                 (tr("Decoding %1...").arg(QFileInfo(m_path).fileName()));
Chris@327:         }
Chris@148: 
Chris@1290:         if (!decode(m_fileBuffer, m_fileBufferSize)) {
Chris@316:             m_error = QString("Failed to decode file %1.").arg(m_path);
Chris@263:         }
Chris@1402: 
Chris@1402:         if (m_sampleBuffer) {
Chris@1402:             for (int c = 0; c < m_channelCount; ++c) {
Chris@1402:                 delete[] m_sampleBuffer[c];
Chris@1402:             }
Chris@1402:             delete[] m_sampleBuffer;
Chris@1582:             m_sampleBuffer = nullptr;
Chris@1402:         }
Chris@263:         
Chris@1290:         delete[] m_fileBuffer;
Chris@1582:         m_fileBuffer = nullptr;
Chris@148: 
Chris@263:         if (isDecodeCacheInitialised()) finishDecodeCache();
Chris@398:         endSerialised();
Chris@263: 
Chris@392:     } else {
Chris@263: 
Chris@392:         if (m_reporter) m_reporter->setProgress(100);
Chris@263: 
Chris@263:         m_decodeThread = new DecodeThread(this);
Chris@263:         m_decodeThread->start();
Chris@263: 
Chris@386:         while ((m_channelCount == 0 || m_fileRate == 0 || m_sampleRate == 0)
Chris@386:                && !m_done) {
Chris@263:             usleep(10);
Chris@263:         }
Chris@386:         
Chris@1288:         SVDEBUG << "MP3FileReader: decoding startup complete, file rate = " << m_fileRate << endl;
Chris@148:     }
Chris@499: 
Chris@499:     if (m_error != "") {
Chris@1279:         SVDEBUG << "MP3FileReader::MP3FileReader(\"" << m_path << "\"): ERROR: " << m_error << endl;
Chris@499:     }
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@392: MP3FileReader::cancelled()
Chris@392: {
Chris@392:     m_cancelled = true;
Chris@392: }
Chris@392: 
Chris@392: void
Chris@1348: MP3FileReader::loadTags(int fd)
Chris@271: {
Chris@271:     m_title = "";
Chris@271: 
Chris@271: #ifdef HAVE_ID3TAG
Chris@271: 
Chris@1364: #ifdef _WIN32
Chris@1364:     int id3fd = _dup(fd);
Chris@1364: #else
Chris@1364:     int id3fd = dup(fd);
Chris@1364: #endif
Chris@1364: 
Chris@1364:     id3_file *file = id3_file_fdopen(id3fd, ID3_FILE_MODE_READONLY);
Chris@271:     if (!file) return;
Chris@271: 
Chris@273:     // We can do this a lot more elegantly, but we'll leave that for
Chris@273:     // when we implement support for more than just the one tag!
Chris@273:     
Chris@271:     id3_tag *tag = id3_file_tag(file);
Chris@273:     if (!tag) {
Chris@1279:         SVDEBUG << "MP3FileReader::loadTags: No ID3 tag found" << endl;
Chris@1364:         id3_file_close(file); // also closes our dup'd fd
Chris@273:         return;
Chris@271:     }
Chris@271: 
Chris@333:     m_title = loadTag(tag, "TIT2"); // work title
Chris@333:     if (m_title == "") m_title = loadTag(tag, "TIT1");
Chris@1287:     if (m_title == "") SVDEBUG << "MP3FileReader::loadTags: No title found" << endl;
Chris@273: 
Chris@333:     m_maker = loadTag(tag, "TPE1"); // "lead artist"
Chris@333:     if (m_maker == "") m_maker = loadTag(tag, "TPE2");
Chris@1287:     if (m_maker == "") SVDEBUG << "MP3FileReader::loadTags: No artist/maker found" << endl;
Chris@273: 
Chris@632:     for (unsigned int i = 0; i < tag->nframes; ++i) {
Chris@632:         if (tag->frames[i]) {
Chris@632:             QString value = loadTag(tag, tag->frames[i]->id);
Chris@1287:             if (value != "") {
Chris@1287:                 m_tags[tag->frames[i]->id] = value;
Chris@1287:             }
Chris@632:         }
Chris@632:     }
Chris@632: 
Chris@1364:     id3_file_close(file); // also closes our dup'd fd
Chris@273: 
Chris@273: #else
Chris@1287:     SVDEBUG << "MP3FileReader::loadTags: ID3 tag support not compiled in" << endl;
Chris@273: #endif
Chris@333: }
Chris@273: 
Chris@333: QString
Chris@333: MP3FileReader::loadTag(void *vtag, const char *name)
Chris@333: {
Chris@333: #ifdef HAVE_ID3TAG
Chris@333:     id3_tag *tag = (id3_tag *)vtag;
Chris@333: 
Chris@333:     id3_frame *frame = id3_tag_findframe(tag, name, 0);
Chris@333:     if (!frame) {
Chris@1287:         SVDEBUG << "MP3FileReader::loadTag: No \"" << name << "\" frame found in ID3 tag" << endl;
Chris@333:         return "";
Chris@333:     }
Chris@333:         
Chris@333:     if (frame->nfields < 2) {
Chris@1287:         cerr << "MP3FileReader::loadTag: WARNING: Not enough fields (" << frame->nfields << ") for \"" << name << "\" in ID3 tag" << endl;
Chris@333:         return "";
Chris@333:     }
Chris@333: 
Chris@333:     unsigned int nstrings = id3_field_getnstrings(&frame->fields[1]);
Chris@333:     if (nstrings == 0) {
Chris@1287:         SVDEBUG << "MP3FileReader::loadTag: No strings for \"" << name << "\" in ID3 tag" << endl;
Chris@333:         return "";
Chris@333:     }
Chris@333: 
Chris@333:     id3_ucs4_t const *ustr = id3_field_getstrings(&frame->fields[1], 0);
Chris@333:     if (!ustr) {
Chris@1287:         SVDEBUG << "MP3FileReader::loadTag: Invalid or absent data for \"" << name << "\" in ID3 tag" << endl;
Chris@333:         return "";
Chris@333:     }
Chris@333:         
Chris@333:     id3_utf8_t *u8str = id3_ucs4_utf8duplicate(ustr);
Chris@333:     if (!u8str) {
Chris@1287:         SVDEBUG << "MP3FileReader::loadTag: ERROR: Internal error: Failed to convert UCS4 to UTF8 in ID3 tag" << endl;
Chris@333:         return "";
Chris@333:     }
Chris@333:         
Chris@333:     QString rv = QString::fromUtf8((const char *)u8str);
Chris@333:     free(u8str);
Chris@334: 
Chris@1287:     SVDEBUG << "MP3FileReader::loadTag: Tag \"" << name << "\" -> \""
Chris@1287:             << rv << "\"" << endl;
Chris@334: 
Chris@333:     return rv;
Chris@333: 
Chris@333: #else
Chris@333:     return "";
Chris@333: #endif
Chris@271: }
Chris@271: 
Chris@271: void
Chris@263: MP3FileReader::DecodeThread::run()
Chris@263: {
Chris@1290:     if (!m_reader->decode(m_reader->m_fileBuffer, m_reader->m_fileBufferSize)) {
Chris@290:         m_reader->m_error = QString("Failed to decode file %1.").arg(m_reader->m_path);
Chris@263:     }
Chris@263: 
Chris@1290:     delete[] m_reader->m_fileBuffer;
Chris@1582:     m_reader->m_fileBuffer = nullptr;
Chris@297: 
Chris@1290:     if (m_reader->m_sampleBuffer) {
Chris@929:         for (int c = 0; c < m_reader->m_channelCount; ++c) {
Chris@1290:             delete[] m_reader->m_sampleBuffer[c];
Chris@297:         }
Chris@1290:         delete[] m_reader->m_sampleBuffer;
Chris@1582:         m_reader->m_sampleBuffer = nullptr;
Chris@297:     }
Chris@297: 
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@297: 
Chris@297:     m_reader->endSerialised();
Chris@263: } 
Chris@263: 
Chris@148: bool
Chris@1038: MP3FileReader::decode(void *mm, sv_frame_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@1288:     data.length = sz;
Chris@1310:     data.finished = false;
Chris@148:     data.reader = this;
Chris@148: 
Chris@1288:     mad_decoder_init(&decoder,          // decoder to initialise
Chris@1288:                      &data,             // our own data block for callbacks
Chris@1288:                      input_callback,    // provides (entire) input to mad
Chris@1582:                      nullptr,                 // checks header
Chris@1288:                      filter_callback,   // filters frame before decoding
Chris@1288:                      output_callback,   // receives decoded output
Chris@1288:                      error_callback,    // handles decode errors
Chris@1582:                      nullptr);                // "message_func"
Chris@1288: 
Chris@148:     mad_decoder_run(&decoder, MAD_DECODER_MODE_SYNC);
Chris@148:     mad_decoder_finish(&decoder);
Chris@148: 
Chris@1288:     SVDEBUG << "MP3FileReader: Decoding complete, decoded " << m_mp3FrameCount
Chris@1288:             << " mp3 frames" << endl;
Chris@1288:     
Chris@263:     m_done = true;
Chris@148:     return true;
Chris@148: }
Chris@148: 
Chris@148: enum mad_flow
Chris@1288: MP3FileReader::input_callback(void *dp, struct mad_stream *stream)
Chris@148: {
Chris@148:     DecoderData *data = (DecoderData *)dp;
Chris@148: 
Chris@1310:     if (!data->length) {
Chris@1310:         data->finished = true;
Chris@1310:         return MAD_FLOW_STOP;
Chris@1310:     }
Chris@348: 
Chris@348:     unsigned char const *start = data->start;
Chris@1288:     sv_frame_t length = data->length;
Chris@348: 
Chris@348: #ifdef HAVE_ID3TAG
Chris@1288:     while (length > ID3_TAG_QUERYSIZE) {
Chris@1038:         ssize_t taglen = id3_tag_query(start, ID3_TAG_QUERYSIZE);
Chris@1288:         if (taglen <= 0) {
Chris@1288:             break;
Chris@348:         }
Chris@1288:         SVDEBUG << "MP3FileReader: ID3 tag length to skip: " << taglen << endl;
Chris@1288:         start += taglen;
Chris@1288:         length -= taglen;
Chris@348:     }
Chris@348: #endif
Chris@348: 
Chris@348:     mad_stream_buffer(stream, start, length);
Chris@148:     data->length = 0;
Chris@148: 
Chris@148:     return MAD_FLOW_CONTINUE;
Chris@148: }
Chris@148: 
Chris@148: enum mad_flow
Chris@1288: MP3FileReader::filter_callback(void *dp,
Chris@1288:                                struct mad_stream const *stream,
Chris@1288:                                struct mad_frame *frame)
Chris@1288: {
Chris@1288:     DecoderData *data = (DecoderData *)dp;
Chris@1288:     return data->reader->filter(stream, frame);
Chris@1288: }
Chris@1288: 
Chris@1307: static string toMagic(unsigned long fourcc)
Chris@1305: {
Chris@1305:     string magic("....");
Chris@1305:     for (int i = 0; i < 4; ++i) {
Chris@1305:         magic[3-i] = char((fourcc >> (8*i)) & 0xff);
Chris@1305:     }
Chris@1305:     return magic;
Chris@1305: }
Chris@1305: 
Chris@1288: enum mad_flow
Chris@1288: MP3FileReader::filter(struct mad_stream const *stream,
Chris@1288:                       struct mad_frame *)
Chris@1288: {
Chris@1289:     if (m_mp3FrameCount > 0) {
Chris@1305:         // only handle info frame if it appears as first mp3 frame
Chris@1289:         return MAD_FLOW_CONTINUE;
Chris@1305:     }
Chris@1305: 
Chris@1313:     if (m_gaplessMode == GaplessMode::Gappy) {
Chris@1305:         // Our non-gapless mode does not even filter out the Xing/LAME
Chris@1305:         // frame. That's because the main reason non-gapless mode
Chris@1305:         // exists is for backward compatibility with MP3FileReader
Chris@1305:         // behaviour before the gapless support was added, so we even
Chris@1305:         // need to keep the spurious 1152 samples resulting from
Chris@1305:         // feeding Xing/LAME frame to the decoder as otherwise we'd
Chris@1305:         // have different output from before.
Chris@1305:         SVDEBUG << "MP3FileReader: Not gapless mode, not checking Xing/LAME frame"
Chris@1305:                 << endl;
Chris@1305:         return MAD_FLOW_CONTINUE;
Chris@1305:     }
Chris@1305:     
Chris@1305:     struct mad_bitptr ptr = stream->anc_ptr;
Chris@1305:     string magic = toMagic(mad_bit_read(&ptr, 32));
Chris@1305: 
Chris@1305:     if (magic == "Xing" || magic == "Info") {
Chris@1305: 
Chris@1305:         SVDEBUG << "MP3FileReader: Found Xing/LAME metadata frame (magic = \""
Chris@1305:                 << magic << "\")" << endl;
Chris@1305: 
Chris@1305:         // All we want at this point is the LAME encoder delay and
Chris@1305:         // padding values. We expect to see the Xing/Info magic (which
Chris@1305:         // we've already read), then 116 bytes of Xing data, then LAME
Chris@1305:         // magic, 5 byte version string, 12 bytes of LAME data that we
Chris@1305:         // aren't currently interested in, then the delays encoded as
Chris@1305:         // two 12-bit numbers into three bytes.
Chris@1305:         //
Chris@1305:         // (See gabriel.mp3-tech.org/mp3infotag.html)
Chris@1305:         
Chris@1305:         for (int skip = 0; skip < 116; ++skip) {
Chris@1305:             (void)mad_bit_read(&ptr, 8);
Chris@1305:         }
Chris@1305: 
Chris@1305:         magic = toMagic(mad_bit_read(&ptr, 32));
Chris@1305: 
Chris@1305:         if (magic == "LAME") {
Chris@1305: 
Chris@1305:             SVDEBUG << "MP3FileReader: Found LAME-specific metadata" << endl;
Chris@1305: 
Chris@1305:             for (int skip = 0; skip < 5 + 12; ++skip) {
Chris@1305:                 (void)mad_bit_read(&ptr, 8);
Chris@1305:             }
Chris@1305: 
Chris@1307:             auto delay = mad_bit_read(&ptr, 12);
Chris@1307:             auto padding = mad_bit_read(&ptr, 12);
Chris@1305: 
Chris@1305:             sv_frame_t delayToDrop = DEFAULT_DECODER_DELAY + delay;
Chris@1305:             sv_frame_t paddingToDrop = padding - DEFAULT_DECODER_DELAY;
Chris@1305:             if (paddingToDrop < 0) paddingToDrop = 0;
Chris@1305: 
Chris@1305:             SVDEBUG << "MP3FileReader: LAME encoder delay = " << delay
Chris@1305:                     << ", padding = " << padding << endl;
Chris@1305: 
Chris@1305:             SVDEBUG << "MP3FileReader: Will be trimming " << delayToDrop
Chris@1306:                     << " samples from start and " << paddingToDrop
Chris@1306:                     << " from end" << endl;
Chris@1305: 
Chris@1307:             CodedAudioFileReader::setFramesToTrim(delayToDrop, paddingToDrop);
Chris@1305:             
Chris@1305:         } else {
Chris@1305:             SVDEBUG << "MP3FileReader: Xing frame has no LAME metadata" << endl;
Chris@1305:         }
Chris@1305:             
Chris@1305:         return MAD_FLOW_IGNORE;
Chris@1305:         
Chris@1288:     } else {
Chris@1305:         return MAD_FLOW_CONTINUE;
Chris@1288:     }
Chris@1288: }
Chris@1288: 
Chris@1288: enum mad_flow
Chris@1288: MP3FileReader::output_callback(void *dp,
Chris@1288:                                struct mad_header const *header,
Chris@1288:                                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@1343:                       struct mad_pcm *pcm)
Chris@148: {
Chris@148:     int channels = pcm->channels;
Chris@148:     int frames = pcm->length;
Chris@1288:     
Chris@148:     if (header) {
Chris@1038:         m_bitrateNum = m_bitrateNum + double(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@297: 
Chris@297:         m_fileRate = pcm->samplerate;
Chris@148:         m_channelCount = channels;
Chris@297: 
Chris@1354:         SVDEBUG << "MP3FileReader::accept: file rate = " << pcm->samplerate
Chris@1354:                 << ", channel count = " << channels << ", about to init "
Chris@1354:                 << "decode cache" << endl;
Chris@1354: 
Chris@297:         initialiseDecodeCache();
Chris@297: 
Chris@297:         if (m_cacheMode == CacheInTemporaryFile) {
Chris@690: //            SVDEBUG << "MP3FileReader::accept: channel count " << m_channelCount << ", file rate " << m_fileRate << ", about to start serialised section" << endl;
Chris@297:             startSerialised("MP3FileReader::Decode");
Chris@297:         }
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@375:         double percent = 100;
Chris@375:         if (duration > 0.0) percent = ((elapsed * 100.0) / duration);
Chris@357:         int p = int(percent);
Chris@357:         if (p < 1) p = 1;
Chris@357:         if (p > 99) p = 99;
Chris@392:         if (m_completion != p && m_reporter) {
Chris@357:             m_completion = p;
Chris@392:             m_reporter->setProgress(m_completion);
Chris@148:         }
Chris@148:     }
Chris@148: 
Chris@1290:     if (m_cancelled) {
Chris@1290:         SVDEBUG << "MP3FileReader: Decoding cancelled" << endl;
Chris@1290:         return MAD_FLOW_STOP;
Chris@1290:     }
Chris@148: 
Chris@148:     if (!isDecodeCacheInitialised()) {
Chris@1354:         SVDEBUG << "MP3FileReader::accept: fallback case: file rate = " << pcm->samplerate
Chris@1354:                 << ", channel count = " << channels << ", about to init "
Chris@1354:                 << "decode cache" << endl;
Chris@148:         initialiseDecodeCache();
Chris@148:     }
Chris@148: 
Chris@1290:     if (m_sampleBufferSize < size_t(frames)) {
Chris@1290:         if (!m_sampleBuffer) {
Chris@1290:             m_sampleBuffer = new float *[channels];
Chris@297:             for (int c = 0; c < channels; ++c) {
Chris@1582:                 m_sampleBuffer[c] = nullptr;
Chris@297:             }
Chris@297:         }
Chris@297:         for (int c = 0; c < channels; ++c) {
Chris@1290:             delete[] m_sampleBuffer[c];
Chris@1290:             m_sampleBuffer[c] = new float[frames];
Chris@297:         }
Chris@1290:         m_sampleBufferSize = frames;
Chris@297:     }
Chris@148: 
Chris@297:     int activeChannels = int(sizeof(pcm->samples) / sizeof(pcm->samples[0]));
Chris@297: 
Chris@297:     for (int ch = 0; ch < channels; ++ch) {
Chris@297: 
Chris@297:         for (int i = 0; i < frames; ++i) {
Chris@297: 
Chris@1343:             mad_fixed_t sample = 0;
Chris@1343:             if (ch < activeChannels) {
Chris@1343:                 sample = pcm->samples[ch][i];
Chris@1343:             }
Chris@1343:             float fsample = float(sample) / float(MAD_F_ONE);
Chris@297:             
Chris@1290:             m_sampleBuffer[ch][i] = fsample;
Chris@1343:         }
Chris@148:     }
Chris@148: 
Chris@1290:     addSamplesToDecodeCache(m_sampleBuffer, frames);
Chris@148: 
Chris@1288:     ++m_mp3FrameCount;
Chris@1288: 
Chris@148:     return MAD_FLOW_CONTINUE;
Chris@148: }
Chris@148: 
Chris@148: enum mad_flow
Chris@1288: MP3FileReader::error_callback(void *dp,
Chris@1288:                               struct mad_stream *stream,
Chris@1288:                               struct mad_frame *)
Chris@148: {
Chris@1284:     DecoderData *data = (DecoderData *)dp;
Chris@1290: 
Chris@1312:     sv_frame_t ix = stream->this_frame - data->start;
Chris@1312:     
Chris@1290:     if (stream->error == MAD_ERROR_LOSTSYNC &&
Chris@1312:         (data->finished || ix >= data->length)) {
Chris@1310:         // We are at end of file, losing sync is expected behaviour,
Chris@1310:         // don't report it
Chris@1290:         return MAD_FLOW_CONTINUE;
Chris@1290:     }
Chris@1290:     
Chris@1284:     if (!data->reader->m_decodeErrorShown) {
Chris@1284:         char buffer[256];
Chris@1284:         snprintf(buffer, 255,
cannam@1334:                  "MP3 decoding error 0x%04x (%s) at byte offset %lld",
Chris@1335:                  stream->error, mad_stream_errorstr(stream), (long long int)ix);
Chris@1284:         SVCERR << "Warning: in file \"" << data->reader->m_path << "\": "
Chris@1284:                << buffer << " (continuing; will not report any further decode errors for this file)" << endl;
Chris@1284:         data->reader->m_decodeErrorShown = true;
Chris@1279:     }
Chris@148: 
Chris@148:     return MAD_FLOW_CONTINUE;
Chris@148: }
Chris@148: 
Chris@157: void
Chris@290: MP3FileReader::getSupportedExtensions(std::set<QString> &extensions)
Chris@157: {
Chris@157:     extensions.insert("mp3");
Chris@157: }
Chris@157: 
Chris@316: bool
Chris@316: MP3FileReader::supportsExtension(QString extension)
Chris@316: {
Chris@316:     std::set<QString> extensions;
Chris@316:     getSupportedExtensions(extensions);
Chris@316:     return (extensions.find(extension.toLower()) != extensions.end());
Chris@316: }
Chris@316: 
Chris@316: bool
Chris@316: MP3FileReader::supportsContentType(QString type)
Chris@316: {
Chris@316:     return (type == "audio/mpeg");
Chris@316: }
Chris@316: 
Chris@316: bool
Chris@317: MP3FileReader::supports(FileSource &source)
Chris@316: {
Chris@316:     return (supportsExtension(source.getExtension()) ||
Chris@316:             supportsContentType(source.getContentType()));
Chris@316: }
Chris@316: 
Chris@316: 
Chris@148: #endif