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 "bluetooth-a2dp"
18
19 #include "a2dp_sbc_decoder.h"
20
21 #include <bluetooth/log.h>
22
23 #include <cstddef>
24 #include <cstdint>
25
26 #include "a2dp_codec_api.h"
27 #include "embdrv/sbc/decoder/include/oi_codec_sbc.h"
28 #include "embdrv/sbc/decoder/include/oi_cpu_dep.h"
29 #include "embdrv/sbc/decoder/include/oi_status.h"
30 #include "stack/include/bt_hdr.h"
31
32 using namespace bluetooth;
33
34 namespace std {
35 template <>
36 struct formatter<OI_STATUS> : enum_formatter<OI_STATUS> {};
37 } // namespace std
38
39 typedef struct {
40 OI_CODEC_SBC_DECODER_CONTEXT decoder_context;
41 uint32_t context_data[CODEC_DATA_WORDS(2, SBC_CODEC_FAST_FILTER_BUFFERS)];
42 int16_t decode_buf[15 * SBC_MAX_SAMPLES_PER_FRAME * SBC_MAX_CHANNELS];
43 decoded_data_callback_t decode_callback;
44 } tA2DP_SBC_DECODER_CB;
45
46 static tA2DP_SBC_DECODER_CB a2dp_sbc_decoder_cb;
47
a2dp_sbc_decoder_init(decoded_data_callback_t decode_callback)48 bool a2dp_sbc_decoder_init(decoded_data_callback_t decode_callback) {
49 OI_STATUS status = OI_CODEC_SBC_DecoderReset(
50 &a2dp_sbc_decoder_cb.decoder_context, a2dp_sbc_decoder_cb.context_data,
51 sizeof(a2dp_sbc_decoder_cb.context_data), 2, 2, false);
52 if (!OI_SUCCESS(status)) {
53 log::error("OI_CODEC_SBC_DecoderReset failed with error code {}", status);
54 return false;
55 }
56
57 a2dp_sbc_decoder_cb.decode_callback = decode_callback;
58 return true;
59 }
60
a2dp_sbc_decoder_cleanup(void)61 void a2dp_sbc_decoder_cleanup(void) {
62 // Do nothing.
63 }
64
a2dp_sbc_decoder_decode_packet(BT_HDR * p_buf)65 bool a2dp_sbc_decoder_decode_packet(BT_HDR* p_buf) {
66 uint8_t* data = p_buf->data + p_buf->offset;
67 size_t data_size = p_buf->len;
68
69 if (data_size == 0) {
70 log::error("Empty packet");
71 return false;
72 }
73 size_t num_frames = data[0] & 0xf;
74 data += 1;
75 data_size -= 1;
76
77 const OI_BYTE* oi_data = data;
78 uint32_t oi_size = data_size;
79 size_t out_avail = sizeof(a2dp_sbc_decoder_cb.decode_buf);
80 int16_t* out_ptr = a2dp_sbc_decoder_cb.decode_buf;
81
82 for (size_t i = 0; i < num_frames; ++i) {
83 uint32_t out_size = out_avail;
84 OI_STATUS status = OI_CODEC_SBC_DecodeFrame(&a2dp_sbc_decoder_cb.decoder_context, &oi_data,
85 &oi_size, out_ptr, &out_size);
86 if (!OI_SUCCESS(status)) {
87 log::error("Decoding failure: {}", status);
88 return false;
89 }
90 out_avail -= out_size;
91 out_ptr += out_size / sizeof(*out_ptr);
92 }
93
94 size_t out_used = (out_ptr - a2dp_sbc_decoder_cb.decode_buf) * sizeof(*out_ptr);
95 a2dp_sbc_decoder_cb.decode_callback(reinterpret_cast<uint8_t*>(a2dp_sbc_decoder_cb.decode_buf),
96 out_used);
97 return true;
98 }
99