Mercurial > hg > svcore
view data/fileio/MP3FileReader.cpp @ 453:1f15beefcd76
* debug
author | Chris Cannam |
---|---|
date | Thu, 09 Oct 2008 12:22:02 +0000 |
parents | 65311fb86166 |
children | b71116d3c180 |
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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */ /* Sonic Visualiser An audio file viewer and annotation editor. Centre for Digital Music, Queen Mary, University of London. This file copyright 2006 Chris Cannam. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. See the file COPYING included with this distribution for more information. */ #ifdef HAVE_MAD #include "MP3FileReader.h" #include "base/ProgressReporter.h" #include "system/System.h" #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <iostream> #include <cstdlib> #ifdef HAVE_ID3TAG #include <id3tag.h> #endif #define DEBUG_ID3TAG 1 #include <QFileInfo> MP3FileReader::MP3FileReader(FileSource source, DecodeMode decodeMode, CacheMode mode, size_t targetRate, ProgressReporter *reporter) : CodedAudioFileReader(mode, targetRate), m_source(source), m_path(source.getLocalFilename()), m_decodeThread(0) { m_channelCount = 0; m_fileRate = 0; m_fileSize = 0; m_bitrateNum = 0; m_bitrateDenom = 0; m_cancelled = false; m_completion = 0; m_done = false; m_reporter = reporter; struct stat stat; if (::stat(m_path.toLocal8Bit().data(), &stat) == -1 || stat.st_size == 0) { m_error = QString("File %1 does not exist.").arg(m_path); return; } m_fileSize = stat.st_size; int fd = -1; if ((fd = ::open(m_path.toLocal8Bit().data(), O_RDONLY #ifdef _WIN32 | O_BINARY #endif , 0)) < 0) { m_error = QString("Failed to open file %1 for reading.").arg(m_path); return; } m_filebuffer = 0; m_samplebuffer = 0; m_samplebuffersize = 0; try { m_filebuffer = new unsigned char[m_fileSize]; } catch (...) { m_error = QString("Out of memory"); ::close(fd); return; } ssize_t sz = 0; size_t offset = 0; while (offset < m_fileSize) { sz = ::read(fd, m_filebuffer + offset, m_fileSize - offset); if (sz < 0) { m_error = QString("Read error for file %1 (after %2 bytes)") .arg(m_path).arg(offset); delete[] m_filebuffer; ::close(fd); return; } else if (sz == 0) { std::cerr << QString("MP3FileReader::MP3FileReader: Warning: reached EOF after only %1 of %2 bytes") .arg(offset).arg(m_fileSize).toStdString() << std::endl; m_fileSize = offset; break; } offset += sz; } ::close(fd); loadTags(); if (decodeMode == DecodeAtOnce) { if (m_reporter) { connect(m_reporter, SIGNAL(cancelled()), this, SLOT(cancelled())); m_reporter->setMessage (tr("Decoding %1...").arg(QFileInfo(m_path).fileName())); } if (!decode(m_filebuffer, m_fileSize)) { m_error = QString("Failed to decode file %1.").arg(m_path); } delete[] m_filebuffer; m_filebuffer = 0; if (isDecodeCacheInitialised()) finishDecodeCache(); endSerialised(); } else { if (m_reporter) m_reporter->setProgress(100); m_decodeThread = new DecodeThread(this); m_decodeThread->start(); while ((m_channelCount == 0 || m_fileRate == 0 || m_sampleRate == 0) && !m_done) { usleep(10); } std::cerr << "MP3FileReader ctor: exiting with file rate = " << m_fileRate << std::endl; } } MP3FileReader::~MP3FileReader() { if (m_decodeThread) { m_cancelled = true; m_decodeThread->wait(); delete m_decodeThread; } } void MP3FileReader::cancelled() { m_cancelled = true; } void MP3FileReader::loadTags() { m_title = ""; #ifdef HAVE_ID3TAG id3_file *file = id3_file_open(m_path.toLocal8Bit().data(), ID3_FILE_MODE_READONLY); if (!file) return; // We can do this a lot more elegantly, but we'll leave that for // when we implement support for more than just the one tag! id3_tag *tag = id3_file_tag(file); if (!tag) { #ifdef DEBUG_ID3TAG std::cerr << "MP3FileReader::loadTags: No ID3 tag found" << std::endl; #endif id3_file_close(file); return; } m_title = loadTag(tag, "TIT2"); // work title if (m_title == "") m_title = loadTag(tag, "TIT1"); m_maker = loadTag(tag, "TPE1"); // "lead artist" if (m_maker == "") m_maker = loadTag(tag, "TPE2"); id3_file_close(file); #else #ifdef DEBUG_ID3TAG std::cerr << "MP3FileReader::loadTags: ID3 tag support not compiled in" << std::endl; #endif #endif } QString MP3FileReader::loadTag(void *vtag, const char *name) { #ifdef HAVE_ID3TAG id3_tag *tag = (id3_tag *)vtag; id3_frame *frame = id3_tag_findframe(tag, name, 0); if (!frame) { #ifdef DEBUG_ID3TAG std::cerr << "MP3FileReader::loadTags: No \"" << name << "\" in ID3 tag" << std::endl; #endif return ""; } if (frame->nfields < 2) { std::cerr << "MP3FileReader::loadTags: WARNING: Not enough fields (" << frame->nfields << ") for \"" << name << "\" in ID3 tag" << std::endl; return ""; } unsigned int nstrings = id3_field_getnstrings(&frame->fields[1]); if (nstrings == 0) { #ifdef DEBUG_ID3TAG std::cerr << "MP3FileReader::loadTags: No strings for \"" << name << "\" in ID3 tag" << std::endl; #endif return ""; } id3_ucs4_t const *ustr = id3_field_getstrings(&frame->fields[1], 0); if (!ustr) { #ifdef DEBUG_ID3TAG std::cerr << "MP3FileReader::loadTags: Invalid or absent data for \"" << name << "\" in ID3 tag" << std::endl; #endif return ""; } id3_utf8_t *u8str = id3_ucs4_utf8duplicate(ustr); if (!u8str) { std::cerr << "MP3FileReader::loadTags: ERROR: Internal error: Failed to convert UCS4 to UTF8 in ID3 title" << std::endl; return ""; } QString rv = QString::fromUtf8((const char *)u8str); free(u8str); #ifdef DEBUG_ID3TAG std::cerr << "MP3FileReader::loadTags: tag \"" << name << "\" -> \"" << rv.toStdString() << "\"" << std::endl; #endif return rv; #else return ""; #endif } void MP3FileReader::DecodeThread::run() { if (!m_reader->decode(m_reader->m_filebuffer, m_reader->m_fileSize)) { m_reader->m_error = QString("Failed to decode file %1.").arg(m_reader->m_path); } delete[] m_reader->m_filebuffer; m_reader->m_filebuffer = 0; if (m_reader->m_samplebuffer) { for (size_t c = 0; c < m_reader->m_channelCount; ++c) { delete[] m_reader->m_samplebuffer[c]; } delete[] m_reader->m_samplebuffer; m_reader->m_samplebuffer = 0; } if (m_reader->isDecodeCacheInitialised()) m_reader->finishDecodeCache(); m_reader->m_done = true; m_reader->m_completion = 100; m_reader->endSerialised(); } bool MP3FileReader::decode(void *mm, size_t sz) { DecoderData data; struct mad_decoder decoder; data.start = (unsigned char const *)mm; data.length = (unsigned long)sz; data.reader = this; mad_decoder_init(&decoder, &data, input, 0, 0, output, error, 0); mad_decoder_run(&decoder, MAD_DECODER_MODE_SYNC); mad_decoder_finish(&decoder); m_done = true; return true; } enum mad_flow MP3FileReader::input(void *dp, struct mad_stream *stream) { DecoderData *data = (DecoderData *)dp; if (!data->length) return MAD_FLOW_STOP; unsigned char const *start = data->start; unsigned long length = data->length; #ifdef HAVE_ID3TAG if (length > ID3_TAG_QUERYSIZE) { int taglen = id3_tag_query(start, ID3_TAG_QUERYSIZE); if (taglen > 0) { // std::cerr << "ID3 tag length to skip: " << taglen << std::endl; start += taglen; length -= taglen; } } #endif mad_stream_buffer(stream, start, length); data->length = 0; return MAD_FLOW_CONTINUE; } enum mad_flow MP3FileReader::output(void *dp, struct mad_header const *header, struct mad_pcm *pcm) { DecoderData *data = (DecoderData *)dp; return data->reader->accept(header, pcm); } enum mad_flow MP3FileReader::accept(struct mad_header const *header, struct mad_pcm *pcm) { int channels = pcm->channels; int frames = pcm->length; if (header) { m_bitrateNum += header->bitrate; m_bitrateDenom ++; } if (frames < 1) return MAD_FLOW_CONTINUE; if (m_channelCount == 0) { m_fileRate = pcm->samplerate; m_channelCount = channels; initialiseDecodeCache(); if (m_cacheMode == CacheInTemporaryFile) { // m_completion = 1; std::cerr << "MP3FileReader::accept: channel count " << m_channelCount << ", file rate " << m_fileRate << ", about to start serialised section" << std::endl; startSerialised("MP3FileReader::Decode"); } } if (m_bitrateDenom > 0) { double bitrate = m_bitrateNum / m_bitrateDenom; double duration = double(m_fileSize * 8) / bitrate; double elapsed = double(m_frameCount) / m_sampleRate; double percent = 100; if (duration > 0.0) percent = ((elapsed * 100.0) / duration); int p = int(percent); if (p < 1) p = 1; if (p > 99) p = 99; if (m_completion != p && m_reporter) { m_completion = p; m_reporter->setProgress(m_completion); } } if (m_cancelled) return MAD_FLOW_STOP; if (!isDecodeCacheInitialised()) { initialiseDecodeCache(); } if (m_samplebuffersize < frames) { if (!m_samplebuffer) { m_samplebuffer = new float *[channels]; for (int c = 0; c < channels; ++c) { m_samplebuffer[c] = 0; } } for (int c = 0; c < channels; ++c) { delete[] m_samplebuffer[c]; m_samplebuffer[c] = new float[frames]; } m_samplebuffersize = frames; } int activeChannels = int(sizeof(pcm->samples) / sizeof(pcm->samples[0])); for (int ch = 0; ch < channels; ++ch) { for (int i = 0; i < frames; ++i) { mad_fixed_t sample = 0; if (ch < activeChannels) { sample = pcm->samples[ch][i]; } float fsample = float(sample) / float(MAD_F_ONE); m_samplebuffer[ch][i] = fsample; } } addSamplesToDecodeCache(m_samplebuffer, frames); return MAD_FLOW_CONTINUE; } enum mad_flow MP3FileReader::error(void *dp, struct mad_stream *stream, struct mad_frame *) { DecoderData *data = (DecoderData *)dp; fprintf(stderr, "decoding error 0x%04x (%s) at byte offset %lu\n", stream->error, mad_stream_errorstr(stream), (unsigned long)(stream->this_frame - data->start)); return MAD_FLOW_CONTINUE; } void MP3FileReader::getSupportedExtensions(std::set<QString> &extensions) { extensions.insert("mp3"); } bool MP3FileReader::supportsExtension(QString extension) { std::set<QString> extensions; getSupportedExtensions(extensions); return (extensions.find(extension.toLower()) != extensions.end()); } bool MP3FileReader::supportsContentType(QString type) { return (type == "audio/mpeg"); } bool MP3FileReader::supports(FileSource &source) { return (supportsExtension(source.getExtension()) || supportsContentType(source.getContentType())); } #endif