> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ai-coustics.com/llms.txt
> Use this file to discover all available pages before exploring further.

# C API reference

> Complete public C SDK 0.25.0 functions, handles, structures and enums.

C SDK **0.25.0** uses core **0.25.0** and model file format **7**. This reference covers the public `aic.h` surface: 50 functions, eight opaque handle types, two value structs and three enums, including every field and enum member. Signatures follow the [released header](https://github.com/ai-coustics/aic-sdk-c/blob/e2bbcccb364ae7b4d884236099eed87b7fad1286/include/aic.h).

For installation and a complete runnable audio example, start with the [C integration guide](/reference/sdk/language-bindings/c). This reference has no automatic model downloader or file-decoding API: download a model separately and decode audio in your application. Internal wrapper-registration exports are not part of the public header contract.

## Browse by task

| Task | Reference |
| - | - |
| Load a model, inspect its rate or configure OTel | [Models and configuration](/reference/sdk/api/c/models-and-config) |
| Enhance audio and control stream state | [Processing](/reference/sdk/api/c/processing) |
| Detect speech with a dedicated model, or from an enhancement processor | [VAD](/reference/sdk/api/c/vad) |
| Collect audio and compute Tyto scores | [Analysis](/reference/sdk/api/c/analysis) |
| Interpret an error or inspect a struct field | [Errors and types](/reference/sdk/api/c/errors-and-types) |

## Alphabetical symbol index

| Public symbol | Definition |
| - | - |
| `aic_analyzer_analyze_buffered` | [Reference](/reference/sdk/api/c/analysis#aic_analyzer_analyze_buffered) |
| `aic_analyzer_destroy` | [Reference](/reference/sdk/api/c/analysis#aic_analyzer_destroy) |
| `aic_analyzer_pair_create` | [Reference](/reference/sdk/api/c/analysis#aic_analyzer_pair_create) |
| `aic_analyzer_reset` | [Reference](/reference/sdk/api/c/analysis#aic_analyzer_reset) |
| `aic_analyzer_terminate_session` | [Reference](/reference/sdk/api/c/analysis#aic_analyzer_terminate_session) |
| `aic_analyzer_update_bearer_token` | [Reference](/reference/sdk/api/c/analysis#aic_analyzer_update_bearer_token) |
| `aic_collector_buffer` | [Reference](/reference/sdk/api/c/analysis#aic_collector_buffer) |
| `aic_collector_destroy` | [Reference](/reference/sdk/api/c/analysis#aic_collector_destroy) |
| `aic_collector_initialize` | [Reference](/reference/sdk/api/c/analysis#aic_collector_initialize) |
| `AIC_ERROR_CODE_AUDIO_CONFIG_MISMATCH` | [Reference](/reference/sdk/api/c/errors-and-types#AIC_ERROR_CODE_AUDIO_CONFIG_MISMATCH) |
| `AIC_ERROR_CODE_AUDIO_CONFIG_UNSUPPORTED` | [Reference](/reference/sdk/api/c/errors-and-types#AIC_ERROR_CODE_AUDIO_CONFIG_UNSUPPORTED) |
| `AIC_ERROR_CODE_FILE_PATH_INVALID` | [Reference](/reference/sdk/api/c/errors-and-types#AIC_ERROR_CODE_FILE_PATH_INVALID) |
| `AIC_ERROR_CODE_FILE_SYSTEM_ERROR` | [Reference](/reference/sdk/api/c/errors-and-types#AIC_ERROR_CODE_FILE_SYSTEM_ERROR) |
| `AIC_ERROR_CODE_INTERNAL_ERROR` | [Reference](/reference/sdk/api/c/errors-and-types#AIC_ERROR_CODE_INTERNAL_ERROR) |
| `AIC_ERROR_CODE_LICENSE_EXPIRED` | [Reference](/reference/sdk/api/c/errors-and-types#AIC_ERROR_CODE_LICENSE_EXPIRED) |
| `AIC_ERROR_CODE_LICENSE_FORMAT_INVALID` | [Reference](/reference/sdk/api/c/errors-and-types#AIC_ERROR_CODE_LICENSE_FORMAT_INVALID) |
| `AIC_ERROR_CODE_LICENSE_VERSION_UNSUPPORTED` | [Reference](/reference/sdk/api/c/errors-and-types#AIC_ERROR_CODE_LICENSE_VERSION_UNSUPPORTED) |
| `AIC_ERROR_CODE_MODEL_DATA_UNALIGNED` | [Reference](/reference/sdk/api/c/errors-and-types#AIC_ERROR_CODE_MODEL_DATA_UNALIGNED) |
| `AIC_ERROR_CODE_MODEL_INVALID` | [Reference](/reference/sdk/api/c/errors-and-types#AIC_ERROR_CODE_MODEL_INVALID) |
| `AIC_ERROR_CODE_MODEL_TYPE_UNSUPPORTED` | [Reference](/reference/sdk/api/c/errors-and-types#AIC_ERROR_CODE_MODEL_TYPE_UNSUPPORTED) |
| `AIC_ERROR_CODE_MODEL_VERSION_UNSUPPORTED` | [Reference](/reference/sdk/api/c/errors-and-types#AIC_ERROR_CODE_MODEL_VERSION_UNSUPPORTED) |
| `AIC_ERROR_CODE_NOT_INITIALIZED` | [Reference](/reference/sdk/api/c/errors-and-types#AIC_ERROR_CODE_NOT_INITIALIZED) |
| `AIC_ERROR_CODE_NULL_POINTER` | [Reference](/reference/sdk/api/c/errors-and-types#AIC_ERROR_CODE_NULL_POINTER) |
| `AIC_ERROR_CODE_PARAMETER_OUT_OF_RANGE` | [Reference](/reference/sdk/api/c/errors-and-types#AIC_ERROR_CODE_PARAMETER_OUT_OF_RANGE) |
| `AIC_ERROR_CODE_PROCESSING_NOT_ALLOWED` | [Reference](/reference/sdk/api/c/errors-and-types#AIC_ERROR_CODE_PROCESSING_NOT_ALLOWED) |
| `AIC_ERROR_CODE_SUCCESS` | [Reference](/reference/sdk/api/c/errors-and-types#AIC_ERROR_CODE_SUCCESS) |
| `AIC_ERROR_CODE_TOKEN_UPDATE_UNSUPPORTED` | [Reference](/reference/sdk/api/c/errors-and-types#AIC_ERROR_CODE_TOKEN_UPDATE_UNSUPPORTED) |
| `aic_energy_vad_context_create` | [Reference](/reference/sdk/api/c/vad#aic_energy_vad_context_create) |
| `aic_energy_vad_context_destroy` | [Reference](/reference/sdk/api/c/vad#aic_energy_vad_context_destroy) |
| `aic_energy_vad_context_get_parameter` | [Reference](/reference/sdk/api/c/vad#aic_energy_vad_context_get_parameter) |
| `aic_energy_vad_context_get_prediction_delay` | [Reference](/reference/sdk/api/c/vad#aic_energy_vad_context_get_prediction_delay) |
| `aic_energy_vad_context_is_speech_detected` | [Reference](/reference/sdk/api/c/vad#aic_energy_vad_context_is_speech_detected) |
| `aic_energy_vad_context_reset` | [Reference](/reference/sdk/api/c/vad#aic_energy_vad_context_reset) |
| `aic_energy_vad_context_set_parameter` | [Reference](/reference/sdk/api/c/vad#aic_energy_vad_context_set_parameter) |
| `aic_get_compatible_model_version` | [Reference](/reference/sdk/api/c/models-and-config#aic_get_compatible_model_version) |
| `aic_get_sdk_version` | [Reference](/reference/sdk/api/c/models-and-config#aic_get_sdk_version) |
| `aic_model_create_from_buffer` | [Reference](/reference/sdk/api/c/models-and-config#aic_model_create_from_buffer) |
| `aic_model_create_from_file` | [Reference](/reference/sdk/api/c/models-and-config#aic_model_create_from_file) |
| `aic_model_destroy` | [Reference](/reference/sdk/api/c/models-and-config#aic_model_destroy) |
| `aic_model_get_id` | [Reference](/reference/sdk/api/c/models-and-config#aic_model_get_id) |
| `aic_model_get_optimal_block_size` | [Reference](/reference/sdk/api/c/models-and-config#aic_model_get_optimal_block_size) |
| `aic_model_get_optimal_sample_rate` | [Reference](/reference/sdk/api/c/models-and-config#aic_model_get_optimal_sample_rate) |
| `aic_processor_context_create` | [Reference](/reference/sdk/api/c/processing#aic_processor_context_create) |
| `aic_processor_context_destroy` | [Reference](/reference/sdk/api/c/processing#aic_processor_context_destroy) |
| `aic_processor_context_get_audio_delay` | [Reference](/reference/sdk/api/c/processing#aic_processor_context_get_audio_delay) |
| `aic_processor_context_get_parameter` | [Reference](/reference/sdk/api/c/processing#aic_processor_context_get_parameter) |
| `aic_processor_context_reset` | [Reference](/reference/sdk/api/c/processing#aic_processor_context_reset) |
| `aic_processor_context_set_parameter` | [Reference](/reference/sdk/api/c/processing#aic_processor_context_set_parameter) |
| `aic_processor_context_update_bearer_token` | [Reference](/reference/sdk/api/c/processing#aic_processor_context_update_bearer_token) |
| `aic_processor_create` | [Reference](/reference/sdk/api/c/processing#aic_processor_create) |
| `aic_processor_destroy` | [Reference](/reference/sdk/api/c/processing#aic_processor_destroy) |
| `aic_processor_initialize` | [Reference](/reference/sdk/api/c/processing#aic_processor_initialize) |
| `AIC_PROCESSOR_PARAMETER_BYPASS` | [Reference](/reference/sdk/api/c/processing#AIC_PROCESSOR_PARAMETER_BYPASS) |
| `AIC_PROCESSOR_PARAMETER_ENHANCEMENT_LEVEL` | [Reference](/reference/sdk/api/c/processing#AIC_PROCESSOR_PARAMETER_ENHANCEMENT_LEVEL) |
| `aic_processor_process` | [Reference](/reference/sdk/api/c/processing#aic_processor_process) |
| `aic_processor_terminate_session` | [Reference](/reference/sdk/api/c/processing#aic_processor_terminate_session) |
| `aic_vad_context_create` | [Reference](/reference/sdk/api/c/vad#aic_vad_context_create) |
| `aic_vad_context_destroy` | [Reference](/reference/sdk/api/c/vad#aic_vad_context_destroy) |
| `aic_vad_context_get_parameter` | [Reference](/reference/sdk/api/c/vad#aic_vad_context_get_parameter) |
| `aic_vad_context_get_prediction_delay` | [Reference](/reference/sdk/api/c/vad#aic_vad_context_get_prediction_delay) |
| `aic_vad_context_get_raw_vad_probability` | [Reference](/reference/sdk/api/c/vad#aic_vad_context_get_raw_vad_probability) |
| `aic_vad_context_is_speech_detected` | [Reference](/reference/sdk/api/c/vad#aic_vad_context_is_speech_detected) |
| `aic_vad_context_reset` | [Reference](/reference/sdk/api/c/vad#aic_vad_context_reset) |
| `aic_vad_context_set_parameter` | [Reference](/reference/sdk/api/c/vad#aic_vad_context_set_parameter) |
| `aic_vad_context_update_bearer_token` | [Reference](/reference/sdk/api/c/vad#aic_vad_context_update_bearer_token) |
| `aic_vad_create` | [Reference](/reference/sdk/api/c/vad#aic_vad_create) |
| `aic_vad_destroy` | [Reference](/reference/sdk/api/c/vad#aic_vad_destroy) |
| `aic_vad_initialize` | [Reference](/reference/sdk/api/c/vad#aic_vad_initialize) |
| `AIC_VAD_PARAMETER_MINIMUM_SPEECH_DURATION` | [Reference](/reference/sdk/api/c/vad#AIC_VAD_PARAMETER_MINIMUM_SPEECH_DURATION) |
| `AIC_VAD_PARAMETER_SENSITIVITY` | [Reference](/reference/sdk/api/c/vad#AIC_VAD_PARAMETER_SENSITIVITY) |
| `AIC_VAD_PARAMETER_SPEECH_HOLD_DURATION` | [Reference](/reference/sdk/api/c/vad#AIC_VAD_PARAMETER_SPEECH_HOLD_DURATION) |
| `aic_vad_process` | [Reference](/reference/sdk/api/c/vad#aic_vad_process) |
| `aic_vad_terminate_session` | [Reference](/reference/sdk/api/c/vad#aic_vad_terminate_session) |
| `AicAnalysisResult` | [Reference](/reference/sdk/api/c/errors-and-types#AicAnalysisResult) |
| `AicAnalysisResult.codec_degradation` | [Reference](/reference/sdk/api/c/errors-and-types#AicAnalysisResult.codec_degradation) |
| `AicAnalysisResult.interfering_speech` | [Reference](/reference/sdk/api/c/errors-and-types#AicAnalysisResult.interfering_speech) |
| `AicAnalysisResult.noise` | [Reference](/reference/sdk/api/c/errors-and-types#AicAnalysisResult.noise) |
| `AicAnalysisResult.packet_loss` | [Reference](/reference/sdk/api/c/errors-and-types#AicAnalysisResult.packet_loss) |
| `AicAnalysisResult.risk_score` | [Reference](/reference/sdk/api/c/errors-and-types#AicAnalysisResult.risk_score) |
| `AicAnalysisResult.speaker_loudness` | [Reference](/reference/sdk/api/c/errors-and-types#AicAnalysisResult.speaker_loudness) |
| `AicAnalysisResult.speaker_reverb` | [Reference](/reference/sdk/api/c/errors-and-types#AicAnalysisResult.speaker_reverb) |
| `AicAnalyzer` | [Reference](/reference/sdk/api/c/errors-and-types#AicAnalyzer) |
| `AicCollector` | [Reference](/reference/sdk/api/c/errors-and-types#AicCollector) |
| `AicEnergyVadContext` | [Reference](/reference/sdk/api/c/errors-and-types#AicEnergyVadContext) |
| `AicErrorCode` | [Reference](/reference/sdk/api/c/errors-and-types#AicErrorCode) |
| `AicModel` | [Reference](/reference/sdk/api/c/errors-and-types#AicModel) |
| `AicOtelConfig` | [Reference](/reference/sdk/api/c/models-and-config#AicOtelConfig) |
| `AicOtelConfig.enable` | [Reference](/reference/sdk/api/c/models-and-config#AicOtelConfig.enable) |
| `AicOtelConfig.export_interval_ms` | [Reference](/reference/sdk/api/c/models-and-config#AicOtelConfig.export_interval_ms) |
| `AicOtelConfig.session_id` | [Reference](/reference/sdk/api/c/models-and-config#AicOtelConfig.session_id) |
| `AicProcessor` | [Reference](/reference/sdk/api/c/errors-and-types#AicProcessor) |
| `AicProcessorContext` | [Reference](/reference/sdk/api/c/errors-and-types#AicProcessorContext) |
| `AicProcessorParameter` | [Reference](/reference/sdk/api/c/processing#AicProcessorParameter) |
| `AicVad` | [Reference](/reference/sdk/api/c/errors-and-types#AicVad) |
| `AicVadContext` | [Reference](/reference/sdk/api/c/errors-and-types#AicVadContext) |
| `AicVadParameter` | [Reference](/reference/sdk/api/c/vad#AicVadParameter) |

## Update this reference

Compare API changes against the released header and implementation, preserving correct text and anchors. Check [compatibility](/reference/sdk/compatibility-matrix) before changing package or model versions.


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