1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#define LOG_TAG "a2dp_sbc_decoder"
18
19#include "a2dp_sbc_decoder.h"
20
21#include <base/logging.h>
22
23#include "embdrv/sbc/decoder/include/oi_codec_sbc.h"
24#include "embdrv/sbc/decoder/include/oi_status.h"
25#include "osi/include/log.h"
26
27typedef struct {
28  OI_CODEC_SBC_DECODER_CONTEXT decoder_context;
29  uint32_t context_data[CODEC_DATA_WORDS(2, SBC_CODEC_FAST_FILTER_BUFFERS)];
30  int16_t decode_buf[15 * SBC_MAX_SAMPLES_PER_FRAME * SBC_MAX_CHANNELS];
31  decoded_data_callback_t decode_callback;
32} tA2DP_SBC_DECODER_CB;
33
34static tA2DP_SBC_DECODER_CB a2dp_sbc_decoder_cb;
35
36bool A2DP_LoadDecoderSbc(void) {
37  // Nothing to do - the library is statically linked
38  return true;
39}
40
41void A2DP_UnloadDecoderSbc(void) { a2dp_sbc_decoder_cleanup(); }
42
43bool a2dp_sbc_decoder_init(decoded_data_callback_t decode_callback) {
44  OI_STATUS status = OI_CODEC_SBC_DecoderReset(
45      &a2dp_sbc_decoder_cb.decoder_context, a2dp_sbc_decoder_cb.context_data,
46      sizeof(a2dp_sbc_decoder_cb.context_data), 2, 2, false);
47  if (!OI_SUCCESS(status)) {
48    LOG_ERROR(LOG_TAG,
49              "%s: OI_CODEC_SBC_DecoderReset failed with error code %d",
50              __func__, status);
51    return false;
52  }
53
54  a2dp_sbc_decoder_cb.decode_callback = decode_callback;
55  return true;
56}
57
58void a2dp_sbc_decoder_cleanup(void) {
59  // Do nothing.
60}
61
62bool a2dp_sbc_decoder_decode_packet(BT_HDR* p_buf) {
63  uint8_t* data = p_buf->data + p_buf->offset;
64  size_t data_size = p_buf->len;
65
66  if (data_size == 0) {
67    LOG_ERROR(LOG_TAG, "%s: Empty packet", __func__);
68    return false;
69  }
70  size_t num_frames = data[0] & 0xf;
71  data += 1;
72  data_size -= 1;
73
74  const OI_BYTE* oi_data = data;
75  uint32_t oi_size = data_size;
76  size_t out_avail = sizeof(a2dp_sbc_decoder_cb.decode_buf);
77  int16_t* out_ptr = a2dp_sbc_decoder_cb.decode_buf;
78
79  for (size_t i = 0; i < num_frames; ++i) {
80    uint32_t out_size = out_avail;
81    OI_STATUS status =
82        OI_CODEC_SBC_DecodeFrame(&a2dp_sbc_decoder_cb.decoder_context, &oi_data,
83                                 &oi_size, out_ptr, &out_size);
84    if (!OI_SUCCESS(status)) {
85      LOG_ERROR(LOG_TAG, "%s: Decoding failure: %d", __func__, status);
86      return false;
87    }
88    out_avail -= out_size;
89    out_ptr += out_size / sizeof(*out_ptr);
90  }
91
92  size_t out_used =
93      (out_ptr - a2dp_sbc_decoder_cb.decode_buf) * sizeof(*out_ptr);
94  a2dp_sbc_decoder_cb.decode_callback(
95      reinterpret_cast<uint8_t*>(a2dp_sbc_decoder_cb.decode_buf), out_used);
96  return true;
97}
98