void
wav_reader_c::scan_chunks() {
wav_chunk_t new_chunk;
bool debug_chunks = debugging_c::requested("wav_reader|wav_reader_chunks");
try {
int64_t file_size = m_in->get_size();
while (true) {
new_chunk.pos = m_in->getFilePointer();
if (m_in->read(new_chunk.id, 4) != 4)
return;
new_chunk.len = m_in->read_uint32_le();
if (debug_chunks)
mxinfo(boost::format("wav_reader_c::scan_chunks() new chunk at %1% type %2% length %3%\n")
% new_chunk.pos % get_displayable_string(new_chunk.id, 4) % new_chunk.len);
if (!strncasecmp(new_chunk.id, "data", 4))
m_bytes_in_data_chunks += new_chunk.len;
else if (!m_chunks.empty() && !strncasecmp(m_chunks.back().id, "data", 4) && (file_size > 0x100000000ll)) {
wav_chunk_t &previous_chunk = m_chunks.back();
int64_t this_chunk_len = file_size - previous_chunk.pos - sizeof(struct chunk_struct);
m_bytes_in_data_chunks -= previous_chunk.len;
m_bytes_in_data_chunks += this_chunk_len;
previous_chunk.len = this_chunk_len;
if (debug_chunks)
mxinfo(boost::format("wav_reader_c::scan_chunks() hugh data chunk with wrong length at %1%; re-calculated from file size; new length %2%\n")
% previous_chunk.pos % previous_chunk.len);
break;
}
m_chunks.push_back(new_chunk);
m_in->setFilePointer(new_chunk.len, seek_current);
}
} catch (...) {
}
}
std::string
get_displayable_string(std::string const &src) {
return get_displayable_string(src.c_str(), src.length());
}
