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le_audio: add util

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This commit is contained in:
Matthias Ringwald 2023-02-06 12:37:15 +01:00
parent 2c39e30fac
commit fd6b825b84
2 changed files with 92 additions and 0 deletions
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90
src/le-audio/le_audio_util.c
View File

@ -291,3 +291,93 @@ uint16_t le_audio_util_metadata_serialize(le_audio_metadata_t * metadata, uint8_
return pos;
}
static uint16_t le_audio_util_get_value_size_for_metadata_type(le_audio_metadata_t * metadata, le_audio_metadata_type_t metadata_type){
switch (metadata_type){
case LE_AUDIO_METADATA_TYPE_PREFERRED_AUDIO_CONTEXTS:
case LE_AUDIO_METADATA_TYPE_STREAMING_AUDIO_CONTEXTS:
return 2;
case LE_AUDIO_METADATA_TYPE_PROGRAM_INFO:
return metadata->program_info_length;
case LE_AUDIO_METADATA_TYPE_LANGUAGE:
return 3;
case LE_AUDIO_METADATA_TYPE_CCID_LIST:
return metadata->ccids_num;
case LE_AUDIO_METADATA_TYPE_PARENTAL_RATING:
return 1;
case LE_AUDIO_METADATA_TYPE_PROGRAM_INFO_URI:
return metadata->program_info_uri_length;
case LE_AUDIO_METADATA_TYPE_MAPPED_EXTENDED_METADATA_BIT_POSITION:
return 2 + metadata->extended_metadata_length;
case LE_AUDIO_METADATA_TYPE_MAPPED_VENDOR_SPECIFIC_METADATA_BIT_POSITION:
return 2 + metadata->vendor_specific_metadata_length;
default:
break;
}
return 0;
}
uint16_t le_audio_util_metadata_serialize_using_mask(le_audio_metadata_t * metadata, uint8_t * tlv_buffer, uint16_t tlv_buffer_size){
uint16_t metadata_type;
uint16_t pos = 0;
uint16_t remaining_bytes = tlv_buffer_size;
for (metadata_type = (uint16_t)LE_AUDIO_METADATA_TYPE_PREFERRED_AUDIO_CONTEXTS; metadata_type < (uint16_t) LE_AUDIO_METADATA_TYPE_RFU; metadata_type++){
if ((metadata->metadata_mask & (1 << metadata_type)) == 0){
continue;
}
uint8_t payload_length = le_audio_util_get_value_size_for_metadata_type(metadata, (le_audio_metadata_type_t)metadata_type);
// ensure that there is enough space in TLV to store length (1), type(1) and payload
if (remaining_bytes < (2 + payload_length)){
return pos;
}
tlv_buffer[pos++] = 1 + payload_length; // add one extra byte to count size of type (1 byte)
tlv_buffer[pos++] = metadata_type;
switch ((le_audio_metadata_type_t)metadata_type){
case LE_AUDIO_METADATA_TYPE_PREFERRED_AUDIO_CONTEXTS:
little_endian_store_16(tlv_buffer, pos, metadata->preferred_audio_contexts_mask);
break;
case LE_AUDIO_METADATA_TYPE_STREAMING_AUDIO_CONTEXTS:
little_endian_store_16(tlv_buffer, pos, metadata->streaming_audio_contexts_mask);
break;
case LE_AUDIO_METADATA_TYPE_PROGRAM_INFO:
memcpy(&tlv_buffer[pos], metadata->program_info, metadata->program_info_length);
break;
case LE_AUDIO_METADATA_TYPE_LANGUAGE:
little_endian_store_24(tlv_buffer, pos, metadata->language_code);
break;
case LE_AUDIO_METADATA_TYPE_CCID_LIST:
memcpy(&tlv_buffer[pos], metadata->ccids, metadata->ccids_num);
break;
case LE_AUDIO_METADATA_TYPE_PARENTAL_RATING:
break;
case LE_AUDIO_METADATA_TYPE_PROGRAM_INFO_URI:
memcpy(&tlv_buffer[pos], metadata->program_info_uri, metadata->program_info_uri_length);
break;
case LE_AUDIO_METADATA_TYPE_MAPPED_EXTENDED_METADATA_BIT_POSITION:
little_endian_store_16(tlv_buffer, pos, metadata->extended_metadata_type);
memcpy(&tlv_buffer[pos + 2], metadata->extended_metadata, metadata->extended_metadata_length);
break;
case LE_AUDIO_METADATA_TYPE_MAPPED_VENDOR_SPECIFIC_METADATA_BIT_POSITION:
little_endian_store_16(tlv_buffer, pos, metadata->vendor_specific_company_id);
memcpy(&tlv_buffer[pos + 2], metadata->vendor_specific_metadata, metadata->vendor_specific_metadata_length);
break;
default:
break;
}
pos += payload_length;
remaining_bytes -= (payload_length + 2);
}
return pos;
}

2
src/le-audio/le_audio_util.h
View File

@ -60,6 +60,8 @@ uint16_t le_audio_util_metadata_parse(uint8_t * buffer, uint8_t buffer_size, le_
uint16_t le_audio_util_metadata_serialize(le_audio_metadata_t * metadata, uint8_t * event, uint16_t event_size);
uint16_t le_audio_util_metadata_serialize_using_mask(le_audio_metadata_t * metadata, uint8_t * tlv_buffer, uint16_t tlv_buffer_size);
#if defined __cplusplus
}
#endif