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/*
* Copyright (C) 2016 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 "a2dp_sbc_decoder"
#include "a2dp_sbc_decoder.h"
#include <base/logging.h>
#include "embdrv/sbc/decoder/include/oi_codec_sbc.h"
#include "embdrv/sbc/decoder/include/oi_status.h"
#include "osi/include/log.h"
#include "stack/include/bt_hdr.h"
typedef struct {
OI_CODEC_SBC_DECODER_CONTEXT decoder_context;
uint32_t context_data[CODEC_DATA_WORDS(2, SBC_CODEC_FAST_FILTER_BUFFERS)];
int16_t decode_buf[15 * SBC_MAX_SAMPLES_PER_FRAME * SBC_MAX_CHANNELS];
decoded_data_callback_t decode_callback;
} tA2DP_SBC_DECODER_CB;
static tA2DP_SBC_DECODER_CB a2dp_sbc_decoder_cb;
bool A2DP_LoadDecoderSbc(void) {
// Nothing to do - the library is statically linked
return true;
}
void A2DP_UnloadDecoderSbc(void) { a2dp_sbc_decoder_cleanup(); }
bool a2dp_sbc_decoder_init(decoded_data_callback_t decode_callback) {
OI_STATUS status = OI_CODEC_SBC_DecoderReset(
&a2dp_sbc_decoder_cb.decoder_context, a2dp_sbc_decoder_cb.context_data,
sizeof(a2dp_sbc_decoder_cb.context_data), 2, 2, false);
if (!OI_SUCCESS(status)) {
LOG_ERROR("%s: OI_CODEC_SBC_DecoderReset failed with error code %d",
__func__, status);
return false;
}
a2dp_sbc_decoder_cb.decode_callback = decode_callback;
return true;
}
void a2dp_sbc_decoder_cleanup(void) {
// Do nothing.
}
bool a2dp_sbc_decoder_decode_packet(BT_HDR* p_buf) {
uint8_t* data = p_buf->data + p_buf->offset;
size_t data_size = p_buf->len;
if (data_size == 0) {
LOG_ERROR("%s: Empty packet", __func__);
return false;
}
size_t num_frames = data[0] & 0xf;
data += 1;
data_size -= 1;
const OI_BYTE* oi_data = data;
uint32_t oi_size = data_size;
size_t out_avail = sizeof(a2dp_sbc_decoder_cb.decode_buf);
int16_t* out_ptr = a2dp_sbc_decoder_cb.decode_buf;
for (size_t i = 0; i < num_frames; ++i) {
uint32_t out_size = out_avail;
OI_STATUS status =
OI_CODEC_SBC_DecodeFrame(&a2dp_sbc_decoder_cb.decoder_context, &oi_data,
&oi_size, out_ptr, &out_size);
if (!OI_SUCCESS(status)) {
LOG_ERROR("%s: Decoding failure: %d", __func__, status);
return false;
}
out_avail -= out_size;
out_ptr += out_size / sizeof(*out_ptr);
}
size_t out_used =
(out_ptr - a2dp_sbc_decoder_cb.decode_buf) * sizeof(*out_ptr);
a2dp_sbc_decoder_cb.decode_callback(
reinterpret_cast<uint8_t*>(a2dp_sbc_decoder_cb.decode_buf), out_used);
return true;
}
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