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openaptxdec.c
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openaptxdec.c
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/*
* aptX decoder utility
* Copyright (C) 2018-2021 Pali Rohár <pali.rohar@gmail.com>
*
* Read README file for license details. Due to license abuse
* this program must not be used in any Freedesktop project.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <string.h>
#ifdef _WIN32
#include <fcntl.h>
#include <io.h>
#endif
#include <openaptx.h>
static unsigned char input_buffer[512*6];
static unsigned char output_buffer[512*3*2*6+3*2*4];
int main(int argc, char *argv[])
{
int i;
int hd;
int ret;
size_t length;
size_t processed;
size_t written;
size_t dropped;
int synced;
int syncing;
struct aptx_context *ctx;
#ifdef _WIN32
_setmode(_fileno(stdin), _O_BINARY);
_setmode(_fileno(stdout), _O_BINARY);
#endif
hd = 0;
for (i = 1; i < argc; ++i) {
if (strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "--help") == 0) {
fprintf(stderr, "aptX decoder utility %d.%d.%d (using libopenaptx %d.%d.%d)\n", OPENAPTX_MAJOR, OPENAPTX_MINOR, OPENAPTX_PATCH, aptx_major, aptx_minor, aptx_patch);
fprintf(stderr, "\n");
fprintf(stderr, "This utility decodes aptX or aptX HD audio stream\n");
fprintf(stderr, "from stdin to a raw 24 bit signed stereo on stdout\n");
fprintf(stderr, "\n");
fprintf(stderr, "When input is damaged it tries to synchronize and recover\n");
fprintf(stderr, "\n");
fprintf(stderr, "Non-zero return value indicates that input was damaged\n");
fprintf(stderr, "and some bytes from input aptX audio stream were dropped\n");
fprintf(stderr, "\n");
fprintf(stderr, "Usage:\n");
fprintf(stderr, " %s [options]\n", argv[0]);
fprintf(stderr, "\n");
fprintf(stderr, "Options:\n");
fprintf(stderr, " -h, --help Display this help\n");
fprintf(stderr, " --hd Decode from aptX HD\n");
fprintf(stderr, "\n");
fprintf(stderr, "Examples:\n");
fprintf(stderr, "\n");
fprintf(stderr, " %s < sample.aptx > sample.s24le\n", argv[0]);
fprintf(stderr, "\n");
fprintf(stderr, " %s --hd < sample.aptxhd > sample.s24le\n", argv[0]);
fprintf(stderr, "\n");
fprintf(stderr, " %s < sample.aptx | play -t raw -r 44.1k -L -e s -b 24 -c 2 -\n", argv[0]);
return 1;
} else if (strcmp(argv[i], "--hd") == 0) {
hd = 1;
} else {
fprintf(stderr, "%s: Invalid option %s\n", argv[0], argv[i]);
return 1;
}
}
ctx = aptx_init(hd);
if (!ctx) {
fprintf(stderr, "%s: Cannot initialize aptX decoder\n", argv[0]);
return 1;
}
/*
* Try to guess type of input stream based on the first six bytes
* Encoder produces fixed first sample because aptX predictor has fixed values
*/
length = fread(input_buffer, 1, 6, stdin);
if (length >= 4 && memcmp(input_buffer, "\x4b\xbf\x4b\xbf", 4) == 0) {
if (hd)
fprintf(stderr, "%s: Input looks like start of aptX audio stream (not aptX HD), try without --hd\n", argv[0]);
} else if (length >= 6 && memcmp(input_buffer, "\x73\xbe\xff\x73\xbe\xff", 6) == 0) {
if (!hd)
fprintf(stderr, "%s: Input looks like start of aptX HD audio stream, try with --hd\n", argv[0]);
} else {
if (length >= 4 && memcmp(input_buffer, "\x6b\xbf\x6b\xbf", 4) == 0)
fprintf(stderr, "%s: Input looks like start of standard aptX audio stream, which is not supported yet\n", argv[0]);
else
fprintf(stderr, "%s: Input does not look like start of aptX nor aptX HD audio stream\n", argv[0]);
}
ret = 0;
syncing = 0;
while (length > 0) {
processed = aptx_decode_sync(ctx, input_buffer, length, output_buffer, sizeof(output_buffer), &written, &synced, &dropped);
/* Check all possible states of synced, syncing and dropped status */
if (!synced) {
if (!syncing) {
fprintf(stderr, "%s: aptX decoding failed, synchronizing\n", argv[0]);
syncing = 1;
ret = 1;
}
if (dropped) {
fprintf(stderr, "%s: aptX synchronization successful, dropped %lu byte%s\n", argv[0], (unsigned long)dropped, (dropped != 1) ? "s" : "");
syncing = 0;
ret = 1;
}
if (!syncing) {
fprintf(stderr, "%s: aptX decoding failed, synchronizing\n", argv[0]);
syncing = 1;
ret = 1;
}
} else {
if (dropped) {
if (!syncing)
fprintf(stderr, "%s: aptX decoding failed, synchronizing\n", argv[0]);
fprintf(stderr, "%s: aptX synchronization successful, dropped %lu byte%s\n", argv[0], (unsigned long)dropped, (dropped != 1) ? "s" : "");
syncing = 0;
ret = 1;
} else if (syncing) {
fprintf(stderr, "%s: aptX synchronization successful\n", argv[0]);
syncing = 0;
ret = 1;
}
}
/* If we have not decoded all supplied samples then decoding unrecoverable failed */
if (processed != length) {
fprintf(stderr, "%s: aptX decoding failed\n", argv[0]);
ret = 1;
break;
}
if (!feof(stdin)) {
length = fread(input_buffer, 1, sizeof(input_buffer), stdin);
if (ferror(stdin)) {
fprintf(stderr, "%s: aptX decoding failed to read input data\n", argv[0]);
ret = 1;
length = 0;
}
} else {
length = 0;
}
/* On the end of the input stream last two decoded samples are just padding and not a real data */
if (length == 0 && !ferror(stdin) && written >= 6*2)
written -= 6*2;
if (written > 0) {
if (fwrite(output_buffer, 1, written, stdout) != written) {
fprintf(stderr, "%s: aptX decoding failed to write decoded data\n", argv[0]);
ret = 1;
break;
}
}
}
dropped = aptx_decode_sync_finish(ctx);
if (dropped && !syncing) {
fprintf(stderr, "%s: aptX decoding stopped in the middle of the sample, dropped %lu byte%s\n", argv[0], (unsigned long)dropped, (dropped != 1) ? "s" : "");
ret = 1;
} else if (syncing) {
fprintf(stderr, "%s: aptX synchronization failed\n", argv[0]);
ret = 1;
}
aptx_finish(ctx);
return ret;
}