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/* Copyright 2019 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <errno.h>
#include <getopt.h>
#include <math.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include "cras_sbc_codec.h"
#include "cras_plc.h"
#define MSBC_CODE_SIZE 240
#define MSBC_PKT_FRAME_LEN 57
#define RND_SEED 7
static const uint8_t msbc_zero_frame[] = {
0xad, 0x00, 0x00, 0xc5, 0x00, 0x00, 0x00, 0x00, 0x77, 0x6d, 0xb6, 0xdd,
0xdb, 0x6d, 0xb7, 0x76, 0xdb, 0x6d, 0xdd, 0xb6, 0xdb, 0x77, 0x6d, 0xb6,
0xdd, 0xdb, 0x6d, 0xb7, 0x76, 0xdb, 0x6d, 0xdd, 0xb6, 0xdb, 0x77, 0x6d,
0xb6, 0xdd, 0xdb, 0x6d, 0xb7, 0x76, 0xdb, 0x6d, 0xdd, 0xb6, 0xdb, 0x77,
0x6d, 0xb6, 0xdd, 0xdb, 0x6d, 0xb7, 0x76, 0xdb, 0x6c
};
bool *generate_pl_seq(int input_file_size, float pl_percent)
{
unsigned pk_count, pl_count;
bool *seq;
pk_count = input_file_size / MSBC_CODE_SIZE;
pl_count = pk_count * (pl_percent / 100.0);
seq = (bool *)calloc(pk_count, sizeof(*seq));
srand(RND_SEED);
while (pl_count > 0) {
bool *missed = &seq[rand() % pk_count];
if (!*missed) {
*missed = true;
pl_count--;
}
}
return seq;
}
/* pl_hex is expected to be consecutive bytes(two chars) in hex format.*/
bool *parse_pl_hex(int input_file_size, const char *pl_hex)
{
char tmp[3];
uint8_t val = 0;
int i, pl_hex_len, seq_len;
bool *seq;
pl_hex_len = strlen(pl_hex);
seq_len = MAX(1 + input_file_size / MSBC_CODE_SIZE, pl_hex_len * 4);
seq = (bool *)calloc(seq_len, sizeof(*seq));
for (i = 0; i < seq_len; i++) {
/* If sequence is longer then the provided pl_hex, leave the
* rest to all zeros. */
if (i > pl_hex_len * 4)
break;
if (i % 8 == 0) {
memcpy(tmp, pl_hex + i / 4, 2);
tmp[2] = '\0';
val = strtol(tmp, NULL, 16);
}
seq[i] = val & 1U;
val >>= 1;
}
printf("pl_hex string maps to %ld ms, total sequence size %f ms\n",
strlen(pl_hex) * 30, seq_len * 7.5f);
return seq;
}
void plc_experiment(const char *input_filename, bool *pl_seq, bool with_plc)
{
char output_filename[255];
int input_fd, output_fd, rc;
struct cras_audio_codec *msbc_input = cras_msbc_codec_create();
struct cras_audio_codec *msbc_output = cras_msbc_codec_create();
struct cras_msbc_plc *plc = cras_msbc_plc_create();
uint8_t buffer[MSBC_CODE_SIZE], packet_buffer[MSBC_PKT_FRAME_LEN];
size_t encoded, decoded;
unsigned count = 0;
input_fd = open(input_filename, O_RDONLY);
if (input_fd == -1) {
fprintf(stderr, "Cannout open input file %s\n", input_filename);
return;
}
if (with_plc)
sprintf(output_filename, "output_with_plc.raw");
else
sprintf(output_filename, "output_with_zero.raw");
output_fd = open(output_filename, O_CREAT | O_RDWR | O_TRUNC, 0644);
if (output_fd == -1) {
fprintf(stderr, "Cannot open output file %s\n",
output_filename);
return;
}
while (1) {
rc = read(input_fd, buffer, MSBC_CODE_SIZE);
if (rc < 0) {
fprintf(stderr, "Cannot read file %s", input_filename);
return;
} else if (rc == 0 || rc < MSBC_CODE_SIZE)
break;
msbc_input->encode(msbc_input, buffer, MSBC_CODE_SIZE,
packet_buffer, MSBC_PKT_FRAME_LEN, &encoded);
if (pl_seq[count]) {
if (with_plc) {
cras_msbc_plc_handle_bad_frames(
plc, msbc_output, buffer);
decoded = MSBC_CODE_SIZE;
} else
msbc_output->decode(msbc_output,
msbc_zero_frame,
MSBC_PKT_FRAME_LEN, buffer,
MSBC_CODE_SIZE, &decoded);
} else {
msbc_output->decode(msbc_output, packet_buffer,
MSBC_PKT_FRAME_LEN, buffer,
MSBC_CODE_SIZE, &decoded);
cras_msbc_plc_handle_good_frames(plc, buffer, buffer);
}
count++;
rc = write(output_fd, buffer, decoded);
if (rc < 0) {
fprintf(stderr, "Cannot write file %s\n",
output_filename);
return;
}
}
}
static void show_usage()
{
printf("This test only supports reading/writing raw audio with format:\n"
"\t16000 sample rate, mono channel, S16_LE\n");
printf("--help - Print this usage.\n");
printf("--input_file - path to an audio file.\n");
printf("--pattern - Hex string representing consecutive packets'"
"status.\n");
printf("--random - Percentage of packet loss.\n");
}
int main(int argc, char **argv)
{
int fd;
struct stat st;
float pl_percent;
int pl_percent_set = 0;
int option_character;
int option_index = 0;
const char *input_file = NULL;
const char *pl_hex = NULL;
bool *pl_seq = NULL;
static struct option long_options[] = {
{ "help", no_argument, NULL, 'h' },
{ "input", required_argument, NULL, 'i' },
{ "pattern", required_argument, NULL, 'p' },
{ "random", required_argument, NULL, 'r' },
{ NULL, 0, NULL, 0 },
};
while (true) {
option_character = getopt_long(argc, argv, "i:r:p:h",
long_options, &option_index);
if (option_character == -1)
break;
switch (option_character) {
case 'h':
show_usage();
break;
case 'i':
input_file = optarg;
break;
case 'p':
pl_hex = optarg;
break;
case 'r':
pl_percent = atof(optarg);
pl_percent_set = 1;
break;
default:
break;
}
}
if ((!pl_percent_set && !pl_hex) || !input_file) {
show_usage();
return 1;
}
fd = open(input_file, O_RDONLY);
if (fd == -1) {
fprintf(stderr, "Cannout open input file %s\n", input_file);
return 1;
}
fstat(fd, &st);
close(fd);
if (pl_percent_set)
pl_seq = generate_pl_seq(st.st_size, pl_percent);
else if (pl_hex)
pl_seq = parse_pl_hex(st.st_size, pl_hex);
plc_experiment(input_file, pl_seq, true);
plc_experiment(input_file, pl_seq, false);
}
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