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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 <cfloat>
#include <cstdio>
#include <cstdlib>
#include <vector>
#include "webrtc/modules/audio_processing/transient/transient_detector.h"
#include "webrtc/modules/audio_processing/transient/file_utils.h"
#include "webrtc/base/scoped_ptr.h"
#include "webrtc/system_wrappers/include/file_wrapper.h"
using rtc::scoped_ptr;
using webrtc::FileWrapper;
using webrtc::TransientDetector;
// Application to generate a RTP timing file.
// Opens the PCM file and divides the signal in frames.
// Creates a send times array, one for each step.
// Each block that contains a transient, has an infinite send time.
// The resultant array is written to a DAT file
// Returns -1 on error or |lost_packets| otherwise.
int main(int argc, char* argv[]) {
if (argc != 5) {
printf("\n%s - Application to generate a RTP timing file.\n\n", argv[0]);
printf("%s PCMfile DATfile chunkSize sampleRate\n\n", argv[0]);
printf("Opens the PCMfile with sampleRate in Hertz.\n");
printf("Creates a send times array, one for each chunkSize ");
printf("milliseconds step.\n");
printf("Each block that contains a transient, has an infinite send time. ");
printf("The resultant array is written to a DATfile.\n\n");
return 0;
}
scoped_ptr<FileWrapper> pcm_file(FileWrapper::Create());
pcm_file->OpenFile(argv[1], true, false, false);
if (!pcm_file->Open()) {
printf("\nThe %s could not be opened.\n\n", argv[1]);
return -1;
}
scoped_ptr<FileWrapper> dat_file(FileWrapper::Create());
dat_file->OpenFile(argv[2], false, false, false);
if (!dat_file->Open()) {
printf("\nThe %s could not be opened.\n\n", argv[2]);
return -1;
}
int chunk_size_ms = atoi(argv[3]);
if (chunk_size_ms <= 0) {
printf("\nThe chunkSize must be a positive integer\n\n");
return -1;
}
int sample_rate_hz = atoi(argv[4]);
if (sample_rate_hz <= 0) {
printf("\nThe sampleRate must be a positive integer\n\n");
return -1;
}
TransientDetector detector(sample_rate_hz);
int lost_packets = 0;
size_t audio_buffer_length = chunk_size_ms * sample_rate_hz / 1000;
scoped_ptr<float[]> audio_buffer(new float[audio_buffer_length]);
std::vector<float> send_times;
// Read first buffer from the PCM test file.
size_t file_samples_read = ReadInt16FromFileToFloatBuffer(
pcm_file.get(),
audio_buffer_length,
audio_buffer.get());
for (int time = 0; file_samples_read > 0; time += chunk_size_ms) {
// Pad the rest of the buffer with zeros.
for (size_t i = file_samples_read; i < audio_buffer_length; ++i) {
audio_buffer[i] = 0.0;
}
float value =
detector.Detect(audio_buffer.get(), audio_buffer_length, NULL, 0);
if (value < 0.5f) {
value = time;
} else {
value = FLT_MAX;
++lost_packets;
}
send_times.push_back(value);
// Read next buffer from the PCM test file.
file_samples_read = ReadInt16FromFileToFloatBuffer(pcm_file.get(),
audio_buffer_length,
audio_buffer.get());
}
size_t floats_written = WriteFloatBufferToFile(dat_file.get(),
send_times.size(),
&send_times[0]);
if (floats_written == 0) {
printf("\nThe send times could not be written to DAT file\n\n");
return -1;
}
pcm_file->CloseFile();
dat_file->CloseFile();
return lost_packets;
}
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