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_aac_decoder"
18
19 #include "a2dp_aac_decoder.h"
20
21 #include <aacdecoder_lib.h>
22 #include <base/logging.h>
23
24 #include "a2dp_aac.h"
25 #include "osi/include/allocator.h"
26 #include "osi/include/log.h"
27
28 #define DECODE_BUF_LEN (8 * 2 * 1024)
29
30 typedef struct {
31 HANDLE_AACDECODER aac_handle;
32 bool has_aac_handle; // True if aac_handle is valid
33 INT_PCM* decode_buf = nullptr;
34 decoded_data_callback_t decode_callback;
35 } tA2DP_AAC_DECODER_CB;
36
37 static tA2DP_AAC_DECODER_CB a2dp_aac_decoder_cb;
38
A2DP_LoadDecoderAac(void)39 bool A2DP_LoadDecoderAac(void) {
40 // Nothing to do - the library is statically linked
41 return true;
42 }
43
A2DP_UnloadDecoderAac(void)44 void A2DP_UnloadDecoderAac(void) { a2dp_aac_decoder_cleanup(); }
45
a2dp_aac_decoder_init(decoded_data_callback_t decode_callback)46 bool a2dp_aac_decoder_init(decoded_data_callback_t decode_callback) {
47 a2dp_aac_decoder_cleanup();
48
49 a2dp_aac_decoder_cb.aac_handle =
50 aacDecoder_Open(TT_MP4_LATM_MCP1, 1 /* nrOfLayers */);
51 a2dp_aac_decoder_cb.has_aac_handle = true;
52 a2dp_aac_decoder_cb.decode_buf = static_cast<INT_PCM*>(
53 osi_malloc(sizeof(a2dp_aac_decoder_cb.decode_buf[0]) * DECODE_BUF_LEN));
54 a2dp_aac_decoder_cb.decode_callback = decode_callback;
55 return true;
56 }
57
a2dp_aac_decoder_cleanup(void)58 void a2dp_aac_decoder_cleanup(void) {
59 if (a2dp_aac_decoder_cb.has_aac_handle)
60 aacDecoder_Close(a2dp_aac_decoder_cb.aac_handle);
61 osi_free(a2dp_aac_decoder_cb.decode_buf);
62 memset(&a2dp_aac_decoder_cb, 0, sizeof(a2dp_aac_decoder_cb));
63 }
64
a2dp_aac_decoder_decode_packet(BT_HDR * p_buf)65 bool a2dp_aac_decoder_decode_packet(BT_HDR* p_buf) {
66 auto* pBuffer = reinterpret_cast<UCHAR*>(p_buf->data + p_buf->offset);
67 UINT bufferSize = p_buf->len;
68 UINT bytesValid = p_buf->len;
69 while (bytesValid > 0) {
70 AAC_DECODER_ERROR err = aacDecoder_Fill(a2dp_aac_decoder_cb.aac_handle,
71 &pBuffer, &bufferSize, &bytesValid);
72 if (err != AAC_DEC_OK) {
73 LOG_ERROR("%s: aacDecoder_Fill failed: 0x%x", __func__,
74 static_cast<unsigned>(err));
75 return false;
76 }
77
78 while (true) {
79 err = aacDecoder_DecodeFrame(a2dp_aac_decoder_cb.aac_handle,
80 a2dp_aac_decoder_cb.decode_buf,
81 DECODE_BUF_LEN, 0 /* flags */);
82 if (err == AAC_DEC_NOT_ENOUGH_BITS) {
83 break;
84 }
85 if (err != AAC_DEC_OK) {
86 LOG_ERROR("%s: aacDecoder_DecodeFrame failed: 0x%x", __func__,
87 static_cast<int>(err));
88 break;
89 }
90
91 CStreamInfo* info =
92 aacDecoder_GetStreamInfo(a2dp_aac_decoder_cb.aac_handle);
93 if (!info || info->sampleRate <= 0) {
94 LOG_ERROR("%s: Invalid stream info", __func__);
95 break;
96 }
97
98 size_t frame_len = info->frameSize * info->numChannels *
99 sizeof(a2dp_aac_decoder_cb.decode_buf[0]);
100 a2dp_aac_decoder_cb.decode_callback(
101 reinterpret_cast<uint8_t*>(a2dp_aac_decoder_cb.decode_buf),
102 frame_len);
103 }
104 }
105
106 return true;
107 }
108