blob: 42bc382d1f9ef50eb6ef602ad4f1f04ac07ee62f [file] [log] [blame]
/*
* Copyright (C) 2023 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.
*/
#define LOG_TAG "hfp_lc3_decoder"
#include "hfp_lc3_decoder.h"
#include <base/logging.h>
#include <bluetooth/log.h>
#include <lc3.h>
#include <cstring>
#include "os/log.h"
#include "osi/include/allocator.h"
using namespace bluetooth;
const int HFP_LC3_H2_HEADER_LEN = 2;
const int HFP_LC3_PKT_FRAME_LEN = 58;
const int HFP_LC3_PCM_BYTES = 480;
static void* hfp_lc3_decoder_mem;
static lc3_decoder_t hfp_lc3_decoder;
bool hfp_lc3_decoder_init() {
if (hfp_lc3_decoder_mem) {
log::warn("The decoder instance should have had been released.");
osi_free(hfp_lc3_decoder_mem);
}
const int dt_us = 7500;
const int sr_hz = 32000;
const int sr_pcm_hz = 32000;
const unsigned dec_size = lc3_decoder_size(dt_us, sr_pcm_hz);
hfp_lc3_decoder_mem = osi_malloc(dec_size);
hfp_lc3_decoder =
lc3_setup_decoder(dt_us, sr_hz, sr_pcm_hz, hfp_lc3_decoder_mem);
return true;
}
void hfp_lc3_decoder_cleanup() {
if (hfp_lc3_decoder_mem) {
osi_free_and_reset((void**)&hfp_lc3_decoder_mem);
}
}
bool hfp_lc3_decoder_decode_packet(const uint8_t* i_buf, int16_t* o_buf,
size_t out_len) {
if (o_buf == nullptr || out_len < HFP_LC3_PCM_BYTES) {
log::error("Output buffer size {} is less than LC3 frame size {}", out_len,
HFP_LC3_PCM_BYTES);
return false;
}
const uint8_t* frame = i_buf ? i_buf + HFP_LC3_H2_HEADER_LEN : nullptr;
/* Note this only fails when wrong parameters are supplied. */
int rc = lc3_decode(hfp_lc3_decoder, frame, HFP_LC3_PKT_FRAME_LEN,
LC3_PCM_FORMAT_S16, o_buf, 1);
ASSERT(rc == 0 || rc == 1);
return !rc;
}