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/*
* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "modules/audio_coding/neteq/tools/input_audio_file.h"
#include "absl/strings/string_view.h"
#include "rtc_base/checks.h"
namespace webrtc {
namespace test {
InputAudioFile::InputAudioFile(absl::string_view file_name, bool loop_at_end)
: loop_at_end_(loop_at_end) {
fp_ = fopen(std::string(file_name).c_str(), "rb");
RTC_DCHECK(fp_) << file_name << " could not be opened.";
}
InputAudioFile::~InputAudioFile() {
RTC_DCHECK(fp_);
fclose(fp_);
}
bool InputAudioFile::Read(size_t samples, int16_t* destination) {
if (!fp_) {
return false;
}
size_t samples_read = fread(destination, sizeof(int16_t), samples, fp_);
if (samples_read < samples) {
if (!loop_at_end_) {
return false;
}
// Rewind and read the missing samples.
rewind(fp_);
size_t missing_samples = samples - samples_read;
if (fread(destination + samples_read, sizeof(int16_t), missing_samples,
fp_) < missing_samples) {
// Could not read enough even after rewinding the file.
return false;
}
}
return true;
}
bool InputAudioFile::Seek(int samples) {
if (!fp_) {
return false;
}
// Find file boundaries.
const long current_pos = ftell(fp_);
RTC_CHECK_NE(EOF, current_pos)
<< "Error returned when getting file position.";
RTC_CHECK_EQ(0, fseek(fp_, 0, SEEK_END)); // Move to end of file.
const long file_size = ftell(fp_);
RTC_CHECK_NE(EOF, file_size) << "Error returned when getting file position.";
// Find new position.
long new_pos = current_pos + sizeof(int16_t) * samples; // Samples to bytes.
if (loop_at_end_) {
new_pos = new_pos % file_size; // Wrap around the end of the file.
if (new_pos < 0) {
// For negative values of new_pos, newpos % file_size will also be
// negative. To get the correct result it's needed to add file_size.
new_pos += file_size;
}
} else {
new_pos = new_pos > file_size ? file_size : new_pos; // Don't loop.
}
RTC_CHECK_GE(new_pos, 0)
<< "Trying to move to before the beginning of the file";
// Move to new position relative to the beginning of the file.
RTC_CHECK_EQ(0, fseek(fp_, new_pos, SEEK_SET));
return true;
}
void InputAudioFile::DuplicateInterleaved(const int16_t* source,
size_t samples,
size_t channels,
int16_t* destination) {
// Start from the end of `source` and `destination`, and work towards the
// beginning. This is to allow in-place interleaving of the same array (i.e.,
// `source` and `destination` are the same array).
for (int i = static_cast<int>(samples - 1); i >= 0; --i) {
for (int j = static_cast<int>(channels - 1); j >= 0; --j) {
destination[i * channels + j] = source[i];
}
}
}
} // namespace test
} // namespace webrtc