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/*
* Copyright (C) 2012 The Android Open Source Project
*
* 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 "AudioResampler.h"
#include <media/AudioBufferProvider.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <errno.h>
#include <time.h>
#include <math.h>
using namespace android;
struct HeaderWav {
HeaderWav(size_t size, int nc, int sr, int bits) {
strncpy(RIFF, "RIFF", 4);
chunkSize = size + sizeof(HeaderWav);
strncpy(WAVE, "WAVE", 4);
strncpy(fmt, "fmt ", 4);
fmtSize = 16;
audioFormat = 1;
numChannels = nc;
samplesRate = sr;
byteRate = sr * numChannels * (bits/8);
align = nc*(bits/8);
bitsPerSample = bits;
strncpy(data, "data", 4);
dataSize = size;
}
char RIFF[4]; // RIFF
uint32_t chunkSize; // File size
char WAVE[4]; // WAVE
char fmt[4]; // fmt\0
uint32_t fmtSize; // fmt size
uint16_t audioFormat; // 1=PCM
uint16_t numChannels; // num channels
uint32_t samplesRate; // sample rate in hz
uint32_t byteRate; // Bps
uint16_t align; // 2=16-bit mono, 4=16-bit stereo
uint16_t bitsPerSample; // bits per sample
char data[4]; // "data"
uint32_t dataSize; // size
};
static int usage(const char* name) {
fprintf(stderr,"Usage: %s [-p] [-h] [-s] [-q {dq|lq|mq|hq|vhq}] [-i input-sample-rate] "
"[-o output-sample-rate] [<input-file>] <output-file>\n", name);
fprintf(stderr," -p enable profiling\n");
fprintf(stderr," -h create wav file\n");
fprintf(stderr," -s stereo\n");
fprintf(stderr," -q resampler quality\n");
fprintf(stderr," dq : default quality\n");
fprintf(stderr," lq : low quality\n");
fprintf(stderr," mq : medium quality\n");
fprintf(stderr," hq : high quality\n");
fprintf(stderr," vhq : very high quality\n");
fprintf(stderr," -i input file sample rate\n");
fprintf(stderr," -o output file sample rate\n");
return -1;
}
int main(int argc, char* argv[]) {
const char* const progname = argv[0];
bool profiling = false;
bool writeHeader = false;
int channels = 1;
int input_freq = 0;
int output_freq = 0;
AudioResampler::src_quality quality = AudioResampler::DEFAULT_QUALITY;
int ch;
while ((ch = getopt(argc, argv, "phsq:i:o:")) != -1) {
switch (ch) {
case 'p':
profiling = true;
break;
case 'h':
writeHeader = true;
break;
case 's':
channels = 2;
break;
case 'q':
if (!strcmp(optarg, "dq"))
quality = AudioResampler::DEFAULT_QUALITY;
else if (!strcmp(optarg, "lq"))
quality = AudioResampler::LOW_QUALITY;
else if (!strcmp(optarg, "mq"))
quality = AudioResampler::MED_QUALITY;
else if (!strcmp(optarg, "hq"))
quality = AudioResampler::HIGH_QUALITY;
else if (!strcmp(optarg, "vhq"))
quality = AudioResampler::VERY_HIGH_QUALITY;
else {
usage(progname);
return -1;
}
break;
case 'i':
input_freq = atoi(optarg);
break;
case 'o':
output_freq = atoi(optarg);
break;
case '?':
default:
usage(progname);
return -1;
}
}
argc -= optind;
argv += optind;
const char* file_in = NULL;
const char* file_out = NULL;
if (argc == 1) {
file_out = argv[0];
} else if (argc == 2) {
file_in = argv[0];
file_out = argv[1];
} else {
usage(progname);
return -1;
}
// ----------------------------------------------------------
size_t input_size;
void* input_vaddr;
if (argc == 2) {
struct stat st;
if (stat(file_in, &st) < 0) {
fprintf(stderr, "stat: %s\n", strerror(errno));
return -1;
}
int input_fd = open(file_in, O_RDONLY);
if (input_fd < 0) {
fprintf(stderr, "open: %s\n", strerror(errno));
return -1;
}
input_size = st.st_size;
input_vaddr = mmap(0, input_size, PROT_READ, MAP_PRIVATE, input_fd, 0);
if (input_vaddr == MAP_FAILED ) {
fprintf(stderr, "mmap: %s\n", strerror(errno));
return -1;
}
} else {
double k = 1000; // Hz / s
double time = (input_freq / 2) / k;
size_t input_frames = size_t(input_freq * time);
input_size = channels * sizeof(int16_t) * input_frames;
input_vaddr = malloc(input_size);
int16_t* in = (int16_t*)input_vaddr;
for (size_t i=0 ; i<input_frames ; i++) {
double t = double(i) / input_freq;
double y = sin(M_PI * k * t * t);
int16_t yi = floor(y * 32767.0 + 0.5);
for (size_t j=0 ; j<(size_t)channels ; j++) {
in[i*channels + j] = yi / (1+j);
}
}
}
// ----------------------------------------------------------
class Provider: public AudioBufferProvider {
int16_t* mAddr;
size_t mNumFrames;
public:
Provider(const void* addr, size_t size, int channels) {
mAddr = (int16_t*) addr;
mNumFrames = size / (channels*sizeof(int16_t));
}
virtual status_t getNextBuffer(Buffer* buffer,
int64_t pts = kInvalidPTS) {
buffer->frameCount = mNumFrames;
buffer->i16 = mAddr;
return NO_ERROR;
}
virtual void releaseBuffer(Buffer* buffer) {
}
} provider(input_vaddr, input_size, channels);
size_t input_frames = input_size / (channels * sizeof(int16_t));
size_t output_size = 2 * 4 * ((int64_t) input_frames * output_freq) / input_freq;
output_size &= ~7; // always stereo, 32-bits
void* output_vaddr = malloc(output_size);
if (profiling) {
AudioResampler* resampler = AudioResampler::create(16, channels,
output_freq, quality);
size_t out_frames = output_size/8;
resampler->setSampleRate(input_freq);
resampler->setVolume(0x1000, 0x1000);
memset(output_vaddr, 0, output_size);
timespec start, end;
clock_gettime(CLOCK_MONOTONIC_HR, &start);
resampler->resample((int*) output_vaddr, out_frames, &provider);
resampler->resample((int*) output_vaddr, out_frames, &provider);
resampler->resample((int*) output_vaddr, out_frames, &provider);
resampler->resample((int*) output_vaddr, out_frames, &provider);
clock_gettime(CLOCK_MONOTONIC_HR, &end);
int64_t start_ns = start.tv_sec * 1000000000LL + start.tv_nsec;
int64_t end_ns = end.tv_sec * 1000000000LL + end.tv_nsec;
int64_t time = (end_ns - start_ns)/4;
printf("%f Mspl/s\n", out_frames/(time/1e9)/1e6);
delete resampler;
}
AudioResampler* resampler = AudioResampler::create(16, channels,
output_freq, quality);
size_t out_frames = output_size/8;
resampler->setSampleRate(input_freq);
resampler->setVolume(0x1000, 0x1000);
memset(output_vaddr, 0, output_size);
resampler->resample((int*) output_vaddr, out_frames, &provider);
// down-mix (we just truncate and keep the left channel)
int32_t* out = (int32_t*) output_vaddr;
int16_t* convert = (int16_t*) malloc(out_frames * channels * sizeof(int16_t));
for (size_t i = 0; i < out_frames; i++) {
for (int j=0 ; j<channels ; j++) {
int32_t s = out[i * 2 + j] >> 12;
if (s > 32767) s = 32767;
else if (s < -32768) s = -32768;
convert[i * channels + j] = int16_t(s);
}
}
// write output to disk
int output_fd = open(file_out, O_WRONLY | O_CREAT | O_TRUNC,
S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
if (output_fd < 0) {
fprintf(stderr, "open: %s\n", strerror(errno));
return -1;
}
if (writeHeader) {
HeaderWav wav(out_frames * channels * sizeof(int16_t), channels, output_freq, 16);
write(output_fd, &wav, sizeof(wav));
}
write(output_fd, convert, out_frames * channels * sizeof(int16_t));
close(output_fd);
return 0;
}