118 lines
2.9 KiB
C
118 lines
2.9 KiB
C
/**
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* @file audio_mixer.h
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* @brief Mixer interface for esp-audio-player. Provides a global mixer that accepts
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* PCM from multiple sources via FreeRTOS ring buffers and writes mixed PCM to I2S.
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*/
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#pragma once
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#include <stdint.h>
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#include "esp_err.h"
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#include "audio_player.h"
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#include "../audio_decode_types.h" // FIXME: leaks out
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#include "audio_stream.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Configuration structure for the audio mixer
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*/
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typedef struct {
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audio_player_mute_fn mute_fn; /**< Function to mute/unmute audio */
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audio_reconfig_std_clock clk_set_fn; /**< Function to reconfigure I2S clock */
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audio_player_write_fn write_fn; /**< Function to write PCM data to I2S */
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UBaseType_t priority; /**< FreeRTOS task priority for the mixer task */
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BaseType_t coreID; /**< ESP32 core ID for the mixer task */
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format i2s_format; /**< Fixed output format for the mixer */
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} audio_mixer_config_t;
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/**
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* @brief Mixer callback function type
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*/
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typedef audio_player_cb_t audio_mixer_cb_t;
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/**
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* @brief Get the number of active streams in the mixer
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*
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* @return Number of active streams
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*/
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uint8_t audio_mixer_stream_count();
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/**
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* @brief Lock the mixer's main mutex
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*
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* Call this before modifying stream state (busy flags, queues).
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*/
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void audio_mixer_lock();
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/**
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* @brief Unlock the mixer's main mutex
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*/
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void audio_mixer_unlock();
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/**
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* @brief Add a stream to the mixer's processing list
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*
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* This function is thread-safe.
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*
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* @param h Handle of the stream to add
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*/
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void audio_mixer_add_stream(audio_stream_handle_t h);
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/**
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* @brief Remove a stream from the mixer's processing list
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*
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* This function is thread-safe.
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*
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* @param h Handle of the stream to remove
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*/
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void audio_mixer_remove_stream(audio_stream_handle_t h);
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/**
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* @brief Query the current mixer output format
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*
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* Returns zeros if the mixer is not initialized.
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*
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* @param[out] sample_rate Pointer to store the sample rate
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* @param[out] bits_per_sample Pointer to store the bits per sample
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* @param[out] channels Pointer to store the number of channels
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*/
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void audio_mixer_get_output_format(uint32_t *sample_rate, uint32_t *bits_per_sample, uint32_t *channels);
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/**
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* @brief Register a global callback for mixer events
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*
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* @param cb Callback function to register
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*/
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void audio_mixer_callback_register(audio_mixer_cb_t cb);
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/**
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* @brief Check if the mixer is initialized
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*
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* @return true if initialized, false otherwise
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*/
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bool audio_mixer_is_initialized();
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/**
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* @brief Initialize the mixer and start the mixer task
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*
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* @param cfg Pointer to the mixer configuration structure
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* @return
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* - ESP_OK: Success
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* - ESP_ERR_INVALID_ARG: Invalid configuration
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* - Others: Fail
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*/
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esp_err_t audio_mixer_init(audio_mixer_config_t *cfg);
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/**
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* @brief Deinitialize the mixer and stop the mixer task
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*/
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void audio_mixer_deinit();
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#ifdef __cplusplus
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}
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#endif
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