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v811_spc009/system/bt/stack/a2dp/a2dp_vendor_aptx.cc

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/*
* Copyright 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.
*/
/******************************************************************************
*
* Utility functions to help build and parse the aptX Codec Information
* Element and Media Payload.
*
******************************************************************************/
#define LOG_TAG "a2dp_vendor_aptx"
#include "bt_target.h"
#include "a2dp_vendor_aptx.h"
#include <string.h>
#include <base/logging.h>
#include "a2dp_vendor.h"
#include "a2dp_vendor_aptx_encoder.h"
#include "bt_utils.h"
#include "btif_av_co.h"
#include "osi/include/log.h"
#include "osi/include/osi.h"
// data type for the aptX Codec Information Element */
typedef struct {
uint32_t vendorId;
uint16_t codecId; /* Codec ID for aptX */
uint8_t sampleRate; /* Sampling Frequency */
uint8_t channelMode; /* STEREO/DUAL/MONO */
uint8_t future1;
uint8_t future2;
btav_a2dp_codec_bits_per_sample_t bits_per_sample;
} tA2DP_APTX_CIE;
/* aptX Source codec capabilities */
static const tA2DP_APTX_CIE a2dp_aptx_source_caps = {
A2DP_APTX_VENDOR_ID, /* vendorId */
A2DP_APTX_CODEC_ID_BLUETOOTH, /* codecId */
(A2DP_APTX_SAMPLERATE_44100 | A2DP_APTX_SAMPLERATE_48000), /* sampleRate */
A2DP_APTX_CHANNELS_STEREO, /* channelMode */
A2DP_APTX_FUTURE_1, /* future1 */
A2DP_APTX_FUTURE_2, /* future2 */
BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16 /* bits_per_sample */
};
/* Default aptX codec configuration */
static const tA2DP_APTX_CIE a2dp_aptx_default_config = {
A2DP_APTX_VENDOR_ID, /* vendorId */
A2DP_APTX_CODEC_ID_BLUETOOTH, /* codecId */
A2DP_APTX_SAMPLERATE_48000, /* sampleRate */
A2DP_APTX_CHANNELS_STEREO, /* channelMode */
A2DP_APTX_FUTURE_1, /* future1 */
A2DP_APTX_FUTURE_2, /* future2 */
BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16 /* bits_per_sample */
};
static const tA2DP_ENCODER_INTERFACE a2dp_encoder_interface_aptx = {
a2dp_vendor_aptx_encoder_init,
a2dp_vendor_aptx_encoder_cleanup,
a2dp_vendor_aptx_feeding_reset,
a2dp_vendor_aptx_feeding_flush,
a2dp_vendor_aptx_get_encoder_interval_ms,
a2dp_vendor_aptx_send_frames,
nullptr // set_transmit_queue_length
};
UNUSED_ATTR static tA2DP_STATUS A2DP_CodecInfoMatchesCapabilityAptx(
const tA2DP_APTX_CIE* p_cap, const uint8_t* p_codec_info,
bool is_peer_codec_info);
// Builds the aptX Media Codec Capabilities byte sequence beginning from the
// LOSC octet. |media_type| is the media type |AVDT_MEDIA_TYPE_*|.
// |p_ie| is a pointer to the aptX Codec Information Element information.
// The result is stored in |p_result|. Returns A2DP_SUCCESS on success,
// otherwise the corresponding A2DP error status code.
static tA2DP_STATUS A2DP_BuildInfoAptx(uint8_t media_type,
const tA2DP_APTX_CIE* p_ie,
uint8_t* p_result) {
if (p_ie == NULL || p_result == NULL) {
return A2DP_INVALID_PARAMS;
}
*p_result++ = A2DP_APTX_CODEC_LEN;
*p_result++ = (media_type << 4);
*p_result++ = A2DP_MEDIA_CT_NON_A2DP;
*p_result++ = (uint8_t)(p_ie->vendorId & 0x000000FF);
*p_result++ = (uint8_t)((p_ie->vendorId & 0x0000FF00) >> 8);
*p_result++ = (uint8_t)((p_ie->vendorId & 0x00FF0000) >> 16);
*p_result++ = (uint8_t)((p_ie->vendorId & 0xFF000000) >> 24);
*p_result++ = (uint8_t)(p_ie->codecId & 0x00FF);
*p_result++ = (uint8_t)((p_ie->codecId & 0xFF00) >> 8);
*p_result++ = p_ie->sampleRate | p_ie->channelMode;
return A2DP_SUCCESS;
}
// Parses the aptX Media Codec Capabilities byte sequence beginning from the
// LOSC octet. The result is stored in |p_ie|. The byte sequence to parse is
// |p_codec_info|. If |is_capability| is true, the byte sequence is
// codec capabilities, otherwise is codec configuration.
// Returns A2DP_SUCCESS on success, otherwise the corresponding A2DP error
// status code.
static tA2DP_STATUS A2DP_ParseInfoAptx(tA2DP_APTX_CIE* p_ie,
const uint8_t* p_codec_info,
bool is_capability) {
uint8_t losc;
uint8_t media_type;
tA2DP_CODEC_TYPE codec_type;
if (p_ie == NULL || p_codec_info == NULL) return A2DP_INVALID_PARAMS;
// Check the codec capability length
losc = *p_codec_info++;
if (losc != A2DP_APTX_CODEC_LEN) return A2DP_WRONG_CODEC;
media_type = (*p_codec_info++) >> 4;
codec_type = *p_codec_info++;
/* Check the Media Type and Media Codec Type */
if (media_type != AVDT_MEDIA_TYPE_AUDIO ||
codec_type != A2DP_MEDIA_CT_NON_A2DP) {
return A2DP_WRONG_CODEC;
}
// Check the Vendor ID and Codec ID */
p_ie->vendorId = (*p_codec_info & 0x000000FF) |
(*(p_codec_info + 1) << 8 & 0x0000FF00) |
(*(p_codec_info + 2) << 16 & 0x00FF0000) |
(*(p_codec_info + 3) << 24 & 0xFF000000);
p_codec_info += 4;
p_ie->codecId =
(*p_codec_info & 0x00FF) | (*(p_codec_info + 1) << 8 & 0xFF00);
p_codec_info += 2;
if (p_ie->vendorId != A2DP_APTX_VENDOR_ID ||
p_ie->codecId != A2DP_APTX_CODEC_ID_BLUETOOTH) {
return A2DP_WRONG_CODEC;
}
p_ie->channelMode = *p_codec_info & 0x0F;
p_ie->sampleRate = *p_codec_info & 0xF0;
p_codec_info++;
if (is_capability) {
// NOTE: The checks here are very liberal. We should be using more
// pedantic checks specific to the SRC or SNK as specified in the spec.
if (A2DP_BitsSet(p_ie->sampleRate) == A2DP_SET_ZERO_BIT)
return A2DP_BAD_SAMP_FREQ;
if (A2DP_BitsSet(p_ie->channelMode) == A2DP_SET_ZERO_BIT)
return A2DP_BAD_CH_MODE;
return A2DP_SUCCESS;
}
if (A2DP_BitsSet(p_ie->sampleRate) != A2DP_SET_ONE_BIT)
return A2DP_BAD_SAMP_FREQ;
if (A2DP_BitsSet(p_ie->channelMode) != A2DP_SET_ONE_BIT)
return A2DP_BAD_CH_MODE;
return A2DP_SUCCESS;
}
bool A2DP_IsVendorSourceCodecValidAptx(const uint8_t* p_codec_info) {
tA2DP_APTX_CIE cfg_cie;
/* Use a liberal check when parsing the codec info */
return (A2DP_ParseInfoAptx(&cfg_cie, p_codec_info, false) == A2DP_SUCCESS) ||
(A2DP_ParseInfoAptx(&cfg_cie, p_codec_info, true) == A2DP_SUCCESS);
}
bool A2DP_IsVendorPeerSinkCodecValidAptx(const uint8_t* p_codec_info) {
tA2DP_APTX_CIE cfg_cie;
/* Use a liberal check when parsing the codec info */
return (A2DP_ParseInfoAptx(&cfg_cie, p_codec_info, false) == A2DP_SUCCESS) ||
(A2DP_ParseInfoAptx(&cfg_cie, p_codec_info, true) == A2DP_SUCCESS);
}
// Checks whether A2DP aptX codec configuration matches with a device's codec
// capabilities. |p_cap| is the aptX codec configuration. |p_codec_info| is
// the device's codec capabilities.
// If |is_capability| is true, the byte sequence is codec capabilities,
// otherwise is codec configuration.
// |p_codec_info| contains the codec capabilities for a peer device that
// is acting as an A2DP source.
// Returns A2DP_SUCCESS if the codec configuration matches with capabilities,
// otherwise the corresponding A2DP error status code.
static tA2DP_STATUS A2DP_CodecInfoMatchesCapabilityAptx(
const tA2DP_APTX_CIE* p_cap, const uint8_t* p_codec_info,
bool is_capability) {
tA2DP_STATUS status;
tA2DP_APTX_CIE cfg_cie;
/* parse configuration */
status = A2DP_ParseInfoAptx(&cfg_cie, p_codec_info, is_capability);
if (status != A2DP_SUCCESS) {
LOG_ERROR("%s: parsing failed %d", __func__, status);
return status;
}
/* verify that each parameter is in range */
LOG_VERBOSE("%s: FREQ peer: 0x%x, capability 0x%x", __func__,
cfg_cie.sampleRate, p_cap->sampleRate);
LOG_VERBOSE("%s: CH_MODE peer: 0x%x, capability 0x%x", __func__,
cfg_cie.channelMode, p_cap->channelMode);
/* sampling frequency */
if ((cfg_cie.sampleRate & p_cap->sampleRate) == 0) return A2DP_NS_SAMP_FREQ;
/* channel mode */
if ((cfg_cie.channelMode & p_cap->channelMode) == 0) return A2DP_NS_CH_MODE;
return A2DP_SUCCESS;
}
bool A2DP_VendorUsesRtpHeaderAptx(UNUSED_ATTR bool content_protection_enabled,
UNUSED_ATTR const uint8_t* p_codec_info) {
#if (BTA_AV_CO_CP_SCMS_T == TRUE)
return true;
#else
// no RTP header for aptX classic and no Copy Protection byte
return false;
#endif
}
const char* A2DP_VendorCodecNameAptx(UNUSED_ATTR const uint8_t* p_codec_info) {
return "aptX";
}
bool A2DP_VendorCodecTypeEqualsAptx(const uint8_t* p_codec_info_a,
const uint8_t* p_codec_info_b) {
tA2DP_APTX_CIE aptx_cie_a;
tA2DP_APTX_CIE aptx_cie_b;
// Check whether the codec info contains valid data
tA2DP_STATUS a2dp_status =
A2DP_ParseInfoAptx(&aptx_cie_a, p_codec_info_a, true);
if (a2dp_status != A2DP_SUCCESS) {
LOG_ERROR("%s: cannot decode codec information: %d", __func__, a2dp_status);
return false;
}
a2dp_status = A2DP_ParseInfoAptx(&aptx_cie_b, p_codec_info_b, true);
if (a2dp_status != A2DP_SUCCESS) {
LOG_ERROR("%s: cannot decode codec information: %d", __func__, a2dp_status);
return false;
}
return true;
}
bool A2DP_VendorCodecEqualsAptx(const uint8_t* p_codec_info_a,
const uint8_t* p_codec_info_b) {
tA2DP_APTX_CIE aptx_cie_a;
tA2DP_APTX_CIE aptx_cie_b;
// Check whether the codec info contains valid data
tA2DP_STATUS a2dp_status =
A2DP_ParseInfoAptx(&aptx_cie_a, p_codec_info_a, true);
if (a2dp_status != A2DP_SUCCESS) {
LOG_ERROR("%s: cannot decode codec information: %d", __func__, a2dp_status);
return false;
}
a2dp_status = A2DP_ParseInfoAptx(&aptx_cie_b, p_codec_info_b, true);
if (a2dp_status != A2DP_SUCCESS) {
LOG_ERROR("%s: cannot decode codec information: %d", __func__, a2dp_status);
return false;
}
return (aptx_cie_a.sampleRate == aptx_cie_b.sampleRate) &&
(aptx_cie_a.channelMode == aptx_cie_b.channelMode);
}
int A2DP_VendorGetBitRateAptx(const uint8_t* p_codec_info) {
A2dpCodecConfig* CodecConfig = bta_av_get_a2dp_current_codec();
tA2DP_BITS_PER_SAMPLE bits_per_sample = CodecConfig->getAudioBitsPerSample();
uint16_t samplerate = A2DP_GetTrackSampleRate(p_codec_info);
return (samplerate * bits_per_sample * 2) / 4;
}
int A2DP_VendorGetTrackSampleRateAptx(const uint8_t* p_codec_info) {
tA2DP_APTX_CIE aptx_cie;
// Check whether the codec info contains valid data
tA2DP_STATUS a2dp_status = A2DP_ParseInfoAptx(&aptx_cie, p_codec_info, false);
if (a2dp_status != A2DP_SUCCESS) {
LOG_ERROR("%s: cannot decode codec information: %d", __func__, a2dp_status);
return -1;
}
if (aptx_cie.sampleRate == A2DP_APTX_SAMPLERATE_44100) return 44100;
if (aptx_cie.sampleRate == A2DP_APTX_SAMPLERATE_48000) return 48000;
return -1;
}
int A2DP_VendorGetTrackBitsPerSampleAptx(const uint8_t* p_codec_info) {
tA2DP_APTX_CIE aptx_cie;
// Check whether the codec info contains valid data
tA2DP_STATUS a2dp_status = A2DP_ParseInfoAptx(&aptx_cie, p_codec_info, false);
if (a2dp_status != A2DP_SUCCESS) {
LOG_ERROR("%s: cannot decode codec information: %d", __func__, a2dp_status);
return -1;
}
// NOTE: The bits per sample never changes for aptX
return 16;
}
int A2DP_VendorGetTrackChannelCountAptx(const uint8_t* p_codec_info) {
tA2DP_APTX_CIE aptx_cie;
// Check whether the codec info contains valid data
tA2DP_STATUS a2dp_status = A2DP_ParseInfoAptx(&aptx_cie, p_codec_info, false);
if (a2dp_status != A2DP_SUCCESS) {
LOG_ERROR("%s: cannot decode codec information: %d", __func__, a2dp_status);
return -1;
}
switch (aptx_cie.channelMode) {
case A2DP_APTX_CHANNELS_MONO:
return 1;
case A2DP_APTX_CHANNELS_STEREO:
return 2;
}
return -1;
}
bool A2DP_VendorGetPacketTimestampAptx(UNUSED_ATTR const uint8_t* p_codec_info,
const uint8_t* p_data,
uint32_t* p_timestamp) {
// TODO: Is this function really codec-specific?
*p_timestamp = *(const uint32_t*)p_data;
return true;
}
bool A2DP_VendorBuildCodecHeaderAptx(UNUSED_ATTR const uint8_t* p_codec_info,
UNUSED_ATTR BT_HDR* p_buf,
UNUSED_ATTR uint16_t frames_per_packet) {
// Nothing to do
return true;
}
std::string A2DP_VendorCodecInfoStringAptx(const uint8_t* p_codec_info) {
std::stringstream res;
std::string field;
tA2DP_STATUS a2dp_status;
tA2DP_APTX_CIE aptx_cie;
a2dp_status = A2DP_ParseInfoAptx(&aptx_cie, p_codec_info, true);
if (a2dp_status != A2DP_SUCCESS) {
res << "A2DP_ParseInfoAptx fail: " << loghex(a2dp_status);
return res.str();
}
res << "\tname: aptX\n";
// Sample frequency
field.clear();
AppendField(&field, (aptx_cie.sampleRate == 0), "NONE");
AppendField(&field, (aptx_cie.sampleRate & A2DP_APTX_SAMPLERATE_44100),
"44100");
AppendField(&field, (aptx_cie.sampleRate & A2DP_APTX_SAMPLERATE_48000),
"48000");
res << "\tsamp_freq: " << field << " (" << loghex(aptx_cie.sampleRate)
<< ")\n";
// Channel mode
field.clear();
AppendField(&field, (aptx_cie.channelMode == 0), "NONE");
AppendField(&field, (aptx_cie.channelMode & A2DP_APTX_CHANNELS_MONO), "Mono");
AppendField(&field, (aptx_cie.channelMode & A2DP_APTX_CHANNELS_STEREO),
"Stereo");
res << "\tch_mode: " << field << " (" << loghex(aptx_cie.channelMode)
<< ")\n";
return res.str();
}
const tA2DP_ENCODER_INTERFACE* A2DP_VendorGetEncoderInterfaceAptx(
const uint8_t* p_codec_info) {
if (!A2DP_IsVendorSourceCodecValidAptx(p_codec_info)) return NULL;
return &a2dp_encoder_interface_aptx;
}
bool A2DP_VendorAdjustCodecAptx(uint8_t* p_codec_info) {
tA2DP_APTX_CIE cfg_cie;
// Nothing to do: just verify the codec info is valid
if (A2DP_ParseInfoAptx(&cfg_cie, p_codec_info, true) != A2DP_SUCCESS)
return false;
return true;
}
btav_a2dp_codec_index_t A2DP_VendorSourceCodecIndexAptx(
UNUSED_ATTR const uint8_t* p_codec_info) {
return BTAV_A2DP_CODEC_INDEX_SOURCE_APTX;
}
const char* A2DP_VendorCodecIndexStrAptx(void) { return "aptX"; }
bool A2DP_VendorInitCodecConfigAptx(AvdtpSepConfig* p_cfg) {
if (A2DP_BuildInfoAptx(AVDT_MEDIA_TYPE_AUDIO, &a2dp_aptx_source_caps,
p_cfg->codec_info) != A2DP_SUCCESS) {
return false;
}
#if (BTA_AV_CO_CP_SCMS_T == TRUE)
/* Content protection info - support SCMS-T */
uint8_t* p = p_cfg->protect_info;
*p++ = AVDT_CP_LOSC;
UINT16_TO_STREAM(p, AVDT_CP_SCMS_T_ID);
p_cfg->num_protect = 1;
#endif
return true;
}
A2dpCodecConfigAptx::A2dpCodecConfigAptx(
btav_a2dp_codec_priority_t codec_priority)
: A2dpCodecConfig(BTAV_A2DP_CODEC_INDEX_SOURCE_APTX,
A2DP_VendorCodecIndexStrAptx(), codec_priority) {
// Compute the local capability
if (a2dp_aptx_source_caps.sampleRate & A2DP_APTX_SAMPLERATE_44100) {
codec_local_capability_.sample_rate |= BTAV_A2DP_CODEC_SAMPLE_RATE_44100;
}
if (a2dp_aptx_source_caps.sampleRate & A2DP_APTX_SAMPLERATE_48000) {
codec_local_capability_.sample_rate |= BTAV_A2DP_CODEC_SAMPLE_RATE_48000;
}
codec_local_capability_.bits_per_sample =
a2dp_aptx_source_caps.bits_per_sample;
if (a2dp_aptx_source_caps.channelMode & A2DP_APTX_CHANNELS_MONO) {
codec_local_capability_.channel_mode |= BTAV_A2DP_CODEC_CHANNEL_MODE_MONO;
}
if (a2dp_aptx_source_caps.channelMode & A2DP_APTX_CHANNELS_STEREO) {
codec_local_capability_.channel_mode |= BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO;
}
}
A2dpCodecConfigAptx::~A2dpCodecConfigAptx() {}
bool A2dpCodecConfigAptx::init() {
if (!isValid()) return false;
// Load the encoder
if (!A2DP_VendorLoadEncoderAptx()) {
LOG_ERROR("%s: cannot load the encoder", __func__);
return false;
}
return true;
}
bool A2dpCodecConfigAptx::useRtpHeaderMarkerBit() const { return false; }
//
// Selects the best sample rate from |sampleRate|.
// The result is stored in |p_result| and p_codec_config|.
// Returns true if a selection was made, otherwise false.
//
static bool select_best_sample_rate(uint8_t sampleRate,
tA2DP_APTX_CIE* p_result,
btav_a2dp_codec_config_t* p_codec_config) {
if (sampleRate & A2DP_APTX_SAMPLERATE_48000) {
p_result->sampleRate = A2DP_APTX_SAMPLERATE_48000;
p_codec_config->sample_rate = BTAV_A2DP_CODEC_SAMPLE_RATE_48000;
return true;
}
if (sampleRate & A2DP_APTX_SAMPLERATE_44100) {
p_result->sampleRate = A2DP_APTX_SAMPLERATE_44100;
p_codec_config->sample_rate = BTAV_A2DP_CODEC_SAMPLE_RATE_44100;
return true;
}
return false;
}
//
// Selects the audio sample rate from |p_codec_audio_config|.
// |sampleRate| contains the capability.
// The result is stored in |p_result| and |p_codec_config|.
// Returns true if a selection was made, otherwise false.
//
static bool select_audio_sample_rate(
const btav_a2dp_codec_config_t* p_codec_audio_config, uint8_t sampleRate,
tA2DP_APTX_CIE* p_result, btav_a2dp_codec_config_t* p_codec_config) {
switch (p_codec_audio_config->sample_rate) {
case BTAV_A2DP_CODEC_SAMPLE_RATE_44100:
if (sampleRate & A2DP_APTX_SAMPLERATE_44100) {
p_result->sampleRate = A2DP_APTX_SAMPLERATE_44100;
p_codec_config->sample_rate = BTAV_A2DP_CODEC_SAMPLE_RATE_44100;
return true;
}
break;
case BTAV_A2DP_CODEC_SAMPLE_RATE_48000:
if (sampleRate & A2DP_APTX_SAMPLERATE_48000) {
p_result->sampleRate = A2DP_APTX_SAMPLERATE_48000;
p_codec_config->sample_rate = BTAV_A2DP_CODEC_SAMPLE_RATE_48000;
return true;
}
break;
case BTAV_A2DP_CODEC_SAMPLE_RATE_88200:
case BTAV_A2DP_CODEC_SAMPLE_RATE_96000:
case BTAV_A2DP_CODEC_SAMPLE_RATE_176400:
case BTAV_A2DP_CODEC_SAMPLE_RATE_192000:
case BTAV_A2DP_CODEC_SAMPLE_RATE_16000:
case BTAV_A2DP_CODEC_SAMPLE_RATE_24000:
case BTAV_A2DP_CODEC_SAMPLE_RATE_NONE:
break;
}
return false;
}
//
// Selects the best bits per sample.
// The result is stored in |p_codec_config|.
// Returns true if a selection was made, otherwise false.
//
static bool select_best_bits_per_sample(
btav_a2dp_codec_config_t* p_codec_config) {
p_codec_config->bits_per_sample = BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16;
return true;
}
//
// Selects the audio bits per sample from |p_codec_audio_config|.
// The result is stored in |p_codec_config|.
// Returns true if a selection was made, otherwise false.
//
static bool select_audio_bits_per_sample(
const btav_a2dp_codec_config_t* p_codec_audio_config,
btav_a2dp_codec_config_t* p_codec_config) {
switch (p_codec_audio_config->bits_per_sample) {
case BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16:
p_codec_config->bits_per_sample = BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16;
return true;
case BTAV_A2DP_CODEC_BITS_PER_SAMPLE_24:
case BTAV_A2DP_CODEC_BITS_PER_SAMPLE_32:
case BTAV_A2DP_CODEC_BITS_PER_SAMPLE_NONE:
break;
}
return false;
}
//
// Selects the best channel mode from |channelMode|.
// The result is stored in |p_result| and |p_codec_config|.
// Returns true if a selection was made, otherwise false.
//
static bool select_best_channel_mode(uint8_t channelMode,
tA2DP_APTX_CIE* p_result,
btav_a2dp_codec_config_t* p_codec_config) {
if (channelMode & A2DP_APTX_CHANNELS_STEREO) {
p_result->channelMode = A2DP_APTX_CHANNELS_STEREO;
p_codec_config->channel_mode = BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO;
return true;
}
if (channelMode & A2DP_APTX_CHANNELS_MONO) {
p_result->channelMode = A2DP_APTX_CHANNELS_MONO;
p_codec_config->channel_mode = BTAV_A2DP_CODEC_CHANNEL_MODE_MONO;
return true;
}
return false;
}
//
// Selects the audio channel mode from |p_codec_audio_config|.
// |channelMode| contains the capability.
// The result is stored in |p_result| and |p_codec_config|.
// Returns true if a selection was made, otherwise false.
//
static bool select_audio_channel_mode(
const btav_a2dp_codec_config_t* p_codec_audio_config, uint8_t channelMode,
tA2DP_APTX_CIE* p_result, btav_a2dp_codec_config_t* p_codec_config) {
switch (p_codec_audio_config->channel_mode) {
case BTAV_A2DP_CODEC_CHANNEL_MODE_MONO:
if (channelMode & A2DP_APTX_CHANNELS_MONO) {
p_result->channelMode = A2DP_APTX_CHANNELS_MONO;
p_codec_config->channel_mode = BTAV_A2DP_CODEC_CHANNEL_MODE_MONO;
return true;
}
break;
case BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO:
if (channelMode & A2DP_APTX_CHANNELS_STEREO) {
p_result->channelMode = A2DP_APTX_CHANNELS_STEREO;
p_codec_config->channel_mode = BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO;
return true;
}
break;
case BTAV_A2DP_CODEC_CHANNEL_MODE_NONE:
break;
}
return false;
}
bool A2dpCodecConfigAptx::setCodecConfig(const uint8_t* p_peer_codec_info,
bool is_capability,
uint8_t* p_result_codec_config) {
std::lock_guard<std::recursive_mutex> lock(codec_mutex_);
tA2DP_APTX_CIE peer_info_cie;
tA2DP_APTX_CIE result_config_cie;
uint8_t sampleRate;
uint8_t channelMode;
// Save the internal state
btav_a2dp_codec_config_t saved_codec_config = codec_config_;
btav_a2dp_codec_config_t saved_codec_capability = codec_capability_;
btav_a2dp_codec_config_t saved_codec_selectable_capability =
codec_selectable_capability_;
btav_a2dp_codec_config_t saved_codec_user_config = codec_user_config_;
btav_a2dp_codec_config_t saved_codec_audio_config = codec_audio_config_;
uint8_t saved_ota_codec_config[AVDT_CODEC_SIZE];
uint8_t saved_ota_codec_peer_capability[AVDT_CODEC_SIZE];
uint8_t saved_ota_codec_peer_config[AVDT_CODEC_SIZE];
memcpy(saved_ota_codec_config, ota_codec_config_, sizeof(ota_codec_config_));
memcpy(saved_ota_codec_peer_capability, ota_codec_peer_capability_,
sizeof(ota_codec_peer_capability_));
memcpy(saved_ota_codec_peer_config, ota_codec_peer_config_,
sizeof(ota_codec_peer_config_));
tA2DP_STATUS status =
A2DP_ParseInfoAptx(&peer_info_cie, p_peer_codec_info, is_capability);
if (status != A2DP_SUCCESS) {
LOG_ERROR("%s: can't parse peer's capabilities: error = %d", __func__,
status);
goto fail;
}
//
// Build the preferred configuration
//
memset(&result_config_cie, 0, sizeof(result_config_cie));
result_config_cie.vendorId = a2dp_aptx_source_caps.vendorId;
result_config_cie.codecId = a2dp_aptx_source_caps.codecId;
//
// Select the sample frequency
//
sampleRate = a2dp_aptx_source_caps.sampleRate & peer_info_cie.sampleRate;
codec_config_.sample_rate = BTAV_A2DP_CODEC_SAMPLE_RATE_NONE;
switch (codec_user_config_.sample_rate) {
case BTAV_A2DP_CODEC_SAMPLE_RATE_44100:
if (sampleRate & A2DP_APTX_SAMPLERATE_44100) {
result_config_cie.sampleRate = A2DP_APTX_SAMPLERATE_44100;
codec_capability_.sample_rate = codec_user_config_.sample_rate;
codec_config_.sample_rate = codec_user_config_.sample_rate;
}
break;
case BTAV_A2DP_CODEC_SAMPLE_RATE_48000:
if (sampleRate & A2DP_APTX_SAMPLERATE_48000) {
result_config_cie.sampleRate = A2DP_APTX_SAMPLERATE_48000;
codec_capability_.sample_rate = codec_user_config_.sample_rate;
codec_config_.sample_rate = codec_user_config_.sample_rate;
}
break;
case BTAV_A2DP_CODEC_SAMPLE_RATE_88200:
case BTAV_A2DP_CODEC_SAMPLE_RATE_96000:
case BTAV_A2DP_CODEC_SAMPLE_RATE_176400:
case BTAV_A2DP_CODEC_SAMPLE_RATE_192000:
case BTAV_A2DP_CODEC_SAMPLE_RATE_16000:
case BTAV_A2DP_CODEC_SAMPLE_RATE_24000:
case BTAV_A2DP_CODEC_SAMPLE_RATE_NONE:
codec_capability_.sample_rate = BTAV_A2DP_CODEC_SAMPLE_RATE_NONE;
codec_config_.sample_rate = BTAV_A2DP_CODEC_SAMPLE_RATE_NONE;
break;
}
// Select the sample frequency if there is no user preference
do {
// Compute the selectable capability
if (sampleRate & A2DP_APTX_SAMPLERATE_44100) {
codec_selectable_capability_.sample_rate |=
BTAV_A2DP_CODEC_SAMPLE_RATE_44100;
}
if (sampleRate & A2DP_APTX_SAMPLERATE_48000) {
codec_selectable_capability_.sample_rate |=
BTAV_A2DP_CODEC_SAMPLE_RATE_48000;
}
if (codec_config_.sample_rate != BTAV_A2DP_CODEC_SAMPLE_RATE_NONE) break;
// Compute the common capability
if (sampleRate & A2DP_APTX_SAMPLERATE_44100)
codec_capability_.sample_rate |= BTAV_A2DP_CODEC_SAMPLE_RATE_44100;
if (sampleRate & A2DP_APTX_SAMPLERATE_48000)
codec_capability_.sample_rate |= BTAV_A2DP_CODEC_SAMPLE_RATE_48000;
// No user preference - try the codec audio config
if (select_audio_sample_rate(&codec_audio_config_, sampleRate,
&result_config_cie, &codec_config_)) {
break;
}
// No user preference - try the default config
if (select_best_sample_rate(
a2dp_aptx_default_config.sampleRate & peer_info_cie.sampleRate,
&result_config_cie, &codec_config_)) {
break;
}
// No user preference - use the best match
if (select_best_sample_rate(sampleRate, &result_config_cie,
&codec_config_)) {
break;
}
} while (false);
if (codec_config_.sample_rate == BTAV_A2DP_CODEC_SAMPLE_RATE_NONE) {
LOG_ERROR(
"%s: cannot match sample frequency: local caps = 0x%x "
"peer info = 0x%x",
__func__, a2dp_aptx_source_caps.sampleRate, peer_info_cie.sampleRate);
goto fail;
}
//
// Select the bits per sample
//
// NOTE: this information is NOT included in the aptX A2DP codec
// description that is sent OTA.
codec_config_.bits_per_sample = BTAV_A2DP_CODEC_BITS_PER_SAMPLE_NONE;
switch (codec_user_config_.bits_per_sample) {
case BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16:
codec_capability_.bits_per_sample = codec_user_config_.bits_per_sample;
codec_config_.bits_per_sample = codec_user_config_.bits_per_sample;
break;
case BTAV_A2DP_CODEC_BITS_PER_SAMPLE_24:
case BTAV_A2DP_CODEC_BITS_PER_SAMPLE_32:
case BTAV_A2DP_CODEC_BITS_PER_SAMPLE_NONE:
codec_capability_.bits_per_sample = BTAV_A2DP_CODEC_BITS_PER_SAMPLE_NONE;
codec_config_.bits_per_sample = BTAV_A2DP_CODEC_BITS_PER_SAMPLE_NONE;
break;
}
// Select the bits per sample if there is no user preference
do {
// Compute the selectable capability
codec_selectable_capability_.bits_per_sample =
a2dp_aptx_source_caps.bits_per_sample;
if (codec_config_.bits_per_sample != BTAV_A2DP_CODEC_BITS_PER_SAMPLE_NONE)
break;
// Compute the common capability
codec_capability_.bits_per_sample = BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16;
// No user preference - try the codec audio config
if (select_audio_bits_per_sample(&codec_audio_config_, &codec_config_)) {
break;
}
// No user preference - try the default config
if (select_best_bits_per_sample(&codec_config_)) {
break;
}
// No user preference - use the best match
// NOTE: no-op - kept here for consistency
if (select_best_bits_per_sample(&codec_config_)) {
break;
}
} while (false);
if (codec_config_.bits_per_sample == BTAV_A2DP_CODEC_BITS_PER_SAMPLE_NONE) {
LOG_ERROR("%s: cannot match bits per sample: user preference = 0x%x",
__func__, codec_user_config_.bits_per_sample);
goto fail;
}
//
// Select the channel mode
//
channelMode = a2dp_aptx_source_caps.channelMode & peer_info_cie.channelMode;
codec_config_.channel_mode = BTAV_A2DP_CODEC_CHANNEL_MODE_NONE;
switch (codec_user_config_.channel_mode) {
case BTAV_A2DP_CODEC_CHANNEL_MODE_MONO:
if (channelMode & A2DP_APTX_CHANNELS_MONO) {
result_config_cie.channelMode = A2DP_APTX_CHANNELS_MONO;
codec_capability_.channel_mode = codec_user_config_.channel_mode;
codec_config_.channel_mode = codec_user_config_.channel_mode;
}
break;
case BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO:
if (channelMode & A2DP_APTX_CHANNELS_STEREO) {
result_config_cie.channelMode = A2DP_APTX_CHANNELS_STEREO;
codec_capability_.channel_mode = codec_user_config_.channel_mode;
codec_config_.channel_mode = codec_user_config_.channel_mode;
}
break;
case BTAV_A2DP_CODEC_CHANNEL_MODE_NONE:
codec_capability_.channel_mode = BTAV_A2DP_CODEC_CHANNEL_MODE_NONE;
codec_config_.channel_mode = BTAV_A2DP_CODEC_CHANNEL_MODE_NONE;
break;
}
// Select the channel mode if there is no user preference
do {
// Compute the selectable capability
if (channelMode & A2DP_APTX_CHANNELS_MONO) {
codec_selectable_capability_.channel_mode |=
BTAV_A2DP_CODEC_CHANNEL_MODE_MONO;
}
if (channelMode & A2DP_APTX_CHANNELS_STEREO) {
codec_selectable_capability_.channel_mode |=
BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO;
}
if (codec_config_.channel_mode != BTAV_A2DP_CODEC_CHANNEL_MODE_NONE) break;
// Compute the common capability
if (channelMode & A2DP_APTX_CHANNELS_MONO)
codec_capability_.channel_mode |= BTAV_A2DP_CODEC_CHANNEL_MODE_MONO;
if (channelMode & A2DP_APTX_CHANNELS_STEREO)
codec_capability_.channel_mode |= BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO;
// No user preference - try the codec audio config
if (select_audio_channel_mode(&codec_audio_config_, channelMode,
&result_config_cie, &codec_config_)) {
break;
}
// No user preference - try the default config
if (select_best_channel_mode(
a2dp_aptx_default_config.channelMode & peer_info_cie.channelMode,
&result_config_cie, &codec_config_)) {
break;
}
// No user preference - use the best match
if (select_best_channel_mode(channelMode, &result_config_cie,
&codec_config_)) {
break;
}
} while (false);
if (codec_config_.channel_mode == BTAV_A2DP_CODEC_CHANNEL_MODE_NONE) {
LOG_ERROR(
"%s: cannot match channel mode: local caps = 0x%x "
"peer info = 0x%x",
__func__, a2dp_aptx_source_caps.channelMode, peer_info_cie.channelMode);
goto fail;
}
//
// Set the rest of the fields as bit-wise AND operation
//
result_config_cie.future1 =
a2dp_aptx_source_caps.future1 & peer_info_cie.future1;
result_config_cie.future2 =
a2dp_aptx_source_caps.future2 & peer_info_cie.future2;
if (A2DP_BuildInfoAptx(AVDT_MEDIA_TYPE_AUDIO, &result_config_cie,
p_result_codec_config) != A2DP_SUCCESS) {
goto fail;
}
//
// Copy the codec-specific fields if they are not zero
//
if (codec_user_config_.codec_specific_1 != 0)
codec_config_.codec_specific_1 = codec_user_config_.codec_specific_1;
if (codec_user_config_.codec_specific_2 != 0)
codec_config_.codec_specific_2 = codec_user_config_.codec_specific_2;
if (codec_user_config_.codec_specific_3 != 0)
codec_config_.codec_specific_3 = codec_user_config_.codec_specific_3;
if (codec_user_config_.codec_specific_4 != 0)
codec_config_.codec_specific_4 = codec_user_config_.codec_specific_4;
// Create a local copy of the peer codec capability/config, and the
// result codec config.
if (is_capability) {
status = A2DP_BuildInfoAptx(AVDT_MEDIA_TYPE_AUDIO, &peer_info_cie,
ota_codec_peer_capability_);
} else {
status = A2DP_BuildInfoAptx(AVDT_MEDIA_TYPE_AUDIO, &peer_info_cie,
ota_codec_peer_config_);
}
CHECK(status == A2DP_SUCCESS);
status = A2DP_BuildInfoAptx(AVDT_MEDIA_TYPE_AUDIO, &result_config_cie,
ota_codec_config_);
CHECK(status == A2DP_SUCCESS);
return true;
fail:
// Restore the internal state
codec_config_ = saved_codec_config;
codec_capability_ = saved_codec_capability;
codec_selectable_capability_ = saved_codec_selectable_capability;
codec_user_config_ = saved_codec_user_config;
codec_audio_config_ = saved_codec_audio_config;
memcpy(ota_codec_config_, saved_ota_codec_config, sizeof(ota_codec_config_));
memcpy(ota_codec_peer_capability_, saved_ota_codec_peer_capability,
sizeof(ota_codec_peer_capability_));
memcpy(ota_codec_peer_config_, saved_ota_codec_peer_config,
sizeof(ota_codec_peer_config_));
return false;
}
bool A2dpCodecConfigAptx::setPeerCodecCapabilities(
const uint8_t* p_peer_codec_capabilities) {
std::lock_guard<std::recursive_mutex> lock(codec_mutex_);
tA2DP_APTX_CIE peer_info_cie;
uint8_t sampleRate;
uint8_t channelMode;
// Save the internal state
btav_a2dp_codec_config_t saved_codec_selectable_capability =
codec_selectable_capability_;
uint8_t saved_ota_codec_peer_capability[AVDT_CODEC_SIZE];
memcpy(saved_ota_codec_peer_capability, ota_codec_peer_capability_,
sizeof(ota_codec_peer_capability_));
tA2DP_STATUS status =
A2DP_ParseInfoAptx(&peer_info_cie, p_peer_codec_capabilities, true);
if (status != A2DP_SUCCESS) {
LOG_ERROR("%s: can't parse peer's capabilities: error = %d", __func__,
status);
goto fail;
}
// Compute the selectable capability - sample rate
sampleRate = a2dp_aptx_source_caps.sampleRate & peer_info_cie.sampleRate;
if (sampleRate & A2DP_APTX_SAMPLERATE_44100) {
codec_selectable_capability_.sample_rate |=
BTAV_A2DP_CODEC_SAMPLE_RATE_44100;
}
if (sampleRate & A2DP_APTX_SAMPLERATE_48000) {
codec_selectable_capability_.sample_rate |=
BTAV_A2DP_CODEC_SAMPLE_RATE_48000;
}
// Compute the selectable capability - bits per sample
codec_selectable_capability_.bits_per_sample =
a2dp_aptx_source_caps.bits_per_sample;
// Compute the selectable capability - channel mode
channelMode = a2dp_aptx_source_caps.channelMode & peer_info_cie.channelMode;
if (channelMode & A2DP_APTX_CHANNELS_MONO) {
codec_selectable_capability_.channel_mode |=
BTAV_A2DP_CODEC_CHANNEL_MODE_MONO;
}
if (channelMode & A2DP_APTX_CHANNELS_STEREO) {
codec_selectable_capability_.channel_mode |=
BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO;
}
status = A2DP_BuildInfoAptx(AVDT_MEDIA_TYPE_AUDIO, &peer_info_cie,
ota_codec_peer_capability_);
CHECK(status == A2DP_SUCCESS);
return true;
fail:
// Restore the internal state
codec_selectable_capability_ = saved_codec_selectable_capability;
memcpy(ota_codec_peer_capability_, saved_ota_codec_peer_capability,
sizeof(ota_codec_peer_capability_));
return false;
}
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