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/* ------------------------------------------------------------------
* Copyright (C) 2017 Matthias P. Braendli
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied.
* See the License for the specific language governing permissions
* and limitations under the License.
* -------------------------------------------------------------------
*/
#include "FileInput.h"
#include "wavfile.h"
#include <cstring>
#include <cstdio>
#include <stdexcept>
#include <stdint.h>
using namespace std;
FileInput::~FileInput()
{
if (m_raw_input and m_in_fh) {
fclose(m_in_fh);
}
else if (m_wav) {
wav_read_close(m_wav);
}
}
void FileInput::prepare(void)
{
const char* fname = m_filename.c_str();
if (m_raw_input) {
if (fname && strcmp(fname, "-")) {
m_in_fh = fopen(fname, "rb");
if (!m_in_fh) {
throw runtime_error("Can't open input file!");
}
}
else {
m_in_fh = stdin;
}
}
else {
int bits_per_sample = 0;
int channels = 0;
int wav_format = 0;
int sample_rate = 0;
m_wav = wav_read_open(fname);
if (!m_wav) {
throw runtime_error("Unable to open wav file " + m_filename);
}
if (!wav_get_header(m_wav, &wav_format, &channels, &sample_rate,
&bits_per_sample, nullptr)) {
throw runtime_error("Bad wav file" + m_filename);
}
if (wav_format != 1) {
throw runtime_error("Unsupported WAV format " + to_string(wav_format));
}
if (bits_per_sample != 16) {
throw runtime_error("Unsupported WAV sample depth " +
to_string(bits_per_sample));
}
if ( !(channels == 1 or channels == 2)) {
throw runtime_error("Unsupported WAV channels " + to_string(channels));
}
if (m_sample_rate != sample_rate) {
throw runtime_error(
"WAV sample rate " +
to_string(sample_rate) +
" doesn't correspond to desired sample rate " +
to_string(m_sample_rate));
}
}
}
bool FileInput::read_source(size_t num_bytes)
{
vector<uint8_t> samplebuf(num_bytes);
ssize_t ret = 0;
if (m_raw_input) {
ret = fread(samplebuf.data(), 1, num_bytes, m_in_fh);
}
else {
ret = wav_read_data(m_wav, samplebuf.data(), num_bytes);
}
if (ret > 0) {
m_queue.push(samplebuf.data(), ret);
}
if (ret < num_bytes) {
if (m_raw_input) {
if (ferror(m_in_fh)) {
return false;
}
if (feof(m_in_fh)) {
if (m_continue_after_eof) {
clearerr(m_in_fh);
}
else {
return false;
}
}
}
else {
// the wavfile input doesn't support the continuation after EOF
return false;
}
}
return true;
}
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