1/*
2 * Copyright 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//
18// A2DP Codec API for aptX
19//
20
21#ifndef A2DP_VENDOR_APTX_H
22#define A2DP_VENDOR_APTX_H
23
24#include "a2dp_codec_api.h"
25#include "a2dp_vendor_aptx_constants.h"
26#include "avdt_api.h"
27
28class A2dpCodecConfigAptx : public A2dpCodecConfig {
29 public:
30  A2dpCodecConfigAptx(btav_a2dp_codec_priority_t codec_priority);
31  virtual ~A2dpCodecConfigAptx();
32
33  bool init() override;
34  period_ms_t encoderIntervalMs() const override;
35  int getEffectiveMtu() const override;
36  bool setCodecConfig(const uint8_t* p_peer_codec_info, bool is_capability,
37                      uint8_t* p_result_codec_config) override;
38  bool setPeerCodecCapabilities(
39      const uint8_t* p_peer_codec_capabilities) override;
40
41 private:
42  bool useRtpHeaderMarkerBit() const override;
43  bool updateEncoderUserConfig(
44      const tA2DP_ENCODER_INIT_PEER_PARAMS* p_peer_params,
45      bool* p_restart_input, bool* p_restart_output,
46      bool* p_config_updated) override;
47  void debug_codec_dump(int fd) override;
48};
49
50// Checks whether the codec capabilities contain a valid A2DP aptX Source
51// codec.
52// NOTE: only codecs that are implemented are considered valid.
53// Returns true if |p_codec_info| contains information about a valid aptX
54// codec, otherwise false.
55bool A2DP_IsVendorSourceCodecValidAptx(const uint8_t* p_codec_info);
56
57// Checks whether the codec capabilities contain a valid peer A2DP aptX Sink
58// codec.
59// NOTE: only codecs that are implemented are considered valid.
60// Returns true if |p_codec_info| contains information about a valid aptX
61// codec, otherwise false.
62bool A2DP_IsVendorPeerSinkCodecValidAptx(const uint8_t* p_codec_info);
63
64// Checks whether the A2DP data packets should contain RTP header.
65// |content_protection_enabled| is true if Content Protection is
66// enabled. |p_codec_info| contains information about the codec capabilities.
67// Returns true if the A2DP data packets should contain RTP header, otherwise
68// false.
69bool A2DP_VendorUsesRtpHeaderAptx(bool content_protection_enabled,
70                                  const uint8_t* p_codec_info);
71
72// Gets the A2DP aptX codec name for a given |p_codec_info|.
73const char* A2DP_VendorCodecNameAptx(const uint8_t* p_codec_info);
74
75// Checks whether two A2DP aptX codecs |p_codec_info_a| and |p_codec_info_b|
76// have the same type.
77// Returns true if the two codecs have the same type, otherwise false.
78bool A2DP_VendorCodecTypeEqualsAptx(const uint8_t* p_codec_info_a,
79                                    const uint8_t* p_codec_info_b);
80
81// Checks whether two A2DP aptX codecs |p_codec_info_a| and |p_codec_info_b|
82// are exactly the same.
83// Returns true if the two codecs are exactly the same, otherwise false.
84// If the codec type is not aptX, the return value is false.
85bool A2DP_VendorCodecEqualsAptx(const uint8_t* p_codec_info_a,
86                                const uint8_t* p_codec_info_b);
87
88// Gets the track sample rate value for the A2DP aptX codec.
89// |p_codec_info| is a pointer to the aptX codec_info to decode.
90// Returns the track sample rate on success, or -1 if |p_codec_info|
91// contains invalid codec information.
92int A2DP_VendorGetTrackSampleRateAptx(const uint8_t* p_codec_info);
93
94// Gets the track bitrate value for the A2DP aptX codec.
95// |p_codec_info| is a pointer to the aptX codec_info to decode.
96// Returns the track sample rate on success, or -1 if |p_codec_info|
97// contains invalid codec information.
98int A2DP_VendorGetBitRateAptx(const uint8_t* p_codec_info);
99
100// Gets the channel count for the A2DP aptX codec.
101// |p_codec_info| is a pointer to the aptX codec_info to decode.
102// Returns the channel count on success, or -1 if |p_codec_info|
103// contains invalid codec information.
104int A2DP_VendorGetTrackChannelCountAptx(const uint8_t* p_codec_info);
105
106// Gets the A2DP aptX audio data timestamp from an audio packet.
107// |p_codec_info| contains the codec information.
108// |p_data| contains the audio data.
109// The timestamp is stored in |p_timestamp|.
110// Returns true on success, otherwise false.
111bool A2DP_VendorGetPacketTimestampAptx(const uint8_t* p_codec_info,
112                                       const uint8_t* p_data,
113                                       uint32_t* p_timestamp);
114
115// Builds A2DP aptX codec header for audio data.
116// |p_codec_info| contains the codec information.
117// |p_buf| contains the audio data.
118// |frames_per_packet| is the number of frames in this packet.
119// Returns true on success, otherwise false.
120bool A2DP_VendorBuildCodecHeaderAptx(const uint8_t* p_codec_info, BT_HDR* p_buf,
121                                     uint16_t frames_per_packet);
122
123// Decodes A2DP aptX codec info into a human readable string.
124// |p_codec_info| is a pointer to the aptX codec_info to decode.
125// Returns a string describing the codec information.
126std::string A2DP_VendorCodecInfoStringAptx(const uint8_t* p_codec_info);
127
128// Gets the A2DP aptX encoder interface that can be used to encode and prepare
129// A2DP packets for transmission - see |tA2DP_ENCODER_INTERFACE|.
130// |p_codec_info| contains the codec information.
131// Returns the A2DP aptX encoder interface if the |p_codec_info| is valid and
132// supported, otherwise NULL.
133const tA2DP_ENCODER_INTERFACE* A2DP_VendorGetEncoderInterfaceAptx(
134    const uint8_t* p_codec_info);
135
136// Adjusts the A2DP aptX codec, based on local support and Bluetooth
137// specification.
138// |p_codec_info| contains the codec information to adjust.
139// Returns true if |p_codec_info| is valid and supported, otherwise false.
140bool A2DP_VendorAdjustCodecAptx(uint8_t* p_codec_info);
141
142// Gets the A2DP aptX Source codec index for a given |p_codec_info|.
143// Returns the corresponding |btav_a2dp_codec_index_t| on success,
144// otherwise |BTAV_A2DP_CODEC_INDEX_MAX|.
145btav_a2dp_codec_index_t A2DP_VendorSourceCodecIndexAptx(
146    const uint8_t* p_codec_info);
147
148// Gets the A2DP aptX Source codec name.
149const char* A2DP_VendorCodecIndexStrAptx(void);
150
151// Initializes A2DP aptX Source codec information into |AvdtpSepConfig|
152// configuration entry pointed by |p_cfg|.
153bool A2DP_VendorInitCodecConfigAptx(AvdtpSepConfig* p_cfg);
154
155#endif  // A2DP_VENDOR_APTX_H
156