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Diffstat (limited to 'include/uapi/sound/sof/eq.h')
| -rw-r--r-- | include/uapi/sound/sof/eq.h | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/include/uapi/sound/sof/eq.h b/include/uapi/sound/sof/eq.h new file mode 100644 index 000000000000..666c2b6a3229 --- /dev/null +++ b/include/uapi/sound/sof/eq.h @@ -0,0 +1,172 @@ +/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */ +/* + * This file is provided under a dual BSD/GPLv2 license. When using or + * redistributing this file, you may do so under either license. + * + * Copyright(c) 2018 Intel Corporation. All rights reserved. + */ + +#ifndef __INCLUDE_UAPI_SOUND_SOF_USER_EQ_H__ +#define __INCLUDE_UAPI_SOUND_SOF_USER_EQ_H__ + +/* FIR EQ type */ + +#define SOF_EQ_FIR_IDX_SWITCH 0 + +#define SOF_EQ_FIR_MAX_SIZE 4096 /* Max size allowed for coef data in bytes */ + +#define SOF_EQ_FIR_MAX_LENGTH 192 /* Max length for individual filter */ + +#define SOF_EQ_FIR_MAX_RESPONSES 8 /* A blob can define max 8 FIR EQs */ + +/* + * eq_fir_configuration data structure contains this information + * uint32_t size + * This is the number of bytes need to store the received EQ + * configuration. + * uint16_t channels_in_config + * This describes the number of channels in this EQ config data. It + * can be different from PLATFORM_MAX_CHANNELS. + * uint16_t number_of_responses + * 0=no responses, 1=one response defined, 2=two responses defined, etc. + * int16_t data[] + * assign_response[channels_in_config] + * 0 = use first response, 1 = use 2nd response, etc. + * E.g. {0, 0, 0, 0, 1, 1, 1, 1} would apply to channels 0-3 the + * same first defined response and for to channels 4-7 the second. + * coef_data[] + * Repeated data + * { filter_length, output_shift, h[] } + * for every EQ response defined where vector h has filter_length + * number of coefficients. Coefficients in h[] are in Q1.15 format. + * E.g. 16384 (Q1.15) = 0.5. The shifts are number of right shifts. + * + * NOTE: The channels_in_config must be even to have coef_data aligned to + * 32 bit word in RAM. Therefore a mono EQ assign must be duplicated to 2ch + * even if it would never used. Similarly a 5ch EQ assign must be increased + * to 6ch. EQ init will return an error if this is not met. + * + * NOTE: The filter_length must be multiple of four. Therefore the filter must + * be padded from the end with zeros have this condition met. + */ + +struct sof_eq_fir_config { + uint32_t size; + uint16_t channels_in_config; + uint16_t number_of_responses; + + /* reserved */ + uint32_t reserved[4]; + + int16_t data[]; +} __packed; + +struct sof_eq_fir_coef_data { + int16_t length; /* Number of FIR taps */ + int16_t out_shift; /* Amount of right shifts at output */ + + /* reserved */ + uint32_t reserved[4]; + + int16_t coef[]; /* FIR coefficients */ +} __packed; + +/* In the struct above there's two 16 bit words (length, shift) and four + * reserved 32 bit words before the actual FIR coefficients. This information + * is used in parsing of the configuration blob. + */ +#define SOF_EQ_FIR_COEF_NHEADER \ + (sizeof(struct sof_eq_fir_coef_data) / sizeof(int16_t)) + +/* IIR EQ type */ + +#define SOF_EQ_IIR_IDX_SWITCH 0 + +#define SOF_EQ_IIR_MAX_SIZE 1024 /* Max size allowed for coef data in bytes */ + +#define SOF_EQ_IIR_MAX_RESPONSES 8 /* A blob can define max 8 IIR EQs */ + +/* eq_iir_configuration + * uint32_t channels_in_config + * This describes the number of channels in this EQ config data. It + * can be different from PLATFORM_MAX_CHANNELS. + * uint32_t number_of_responses_defined + * 0=no responses, 1=one response defined, 2=two responses defined, etc. + * int32_t data[] + * Data consist of two parts. First is the response assign vector that + * has length of channels_in_config. The latter part is coefficient + * data. + * uint32_t assign_response[channels_in_config] + * -1 = not defined, 0 = use first response, 1 = use 2nd, etc. + * E.g. {0, 0, 0, 0, -1, -1, -1, -1} would apply to channels 0-3 the + * same first defined response and leave channels 4-7 unequalized. + * coefficient_data[] + * <1st EQ> + * uint32_t num_biquads + * uint32_t num_biquads_in_series + * <1st biquad> + * int32_t coef_a2 Q2.30 format + * int32_t coef_a1 Q2.30 format + * int32_t coef_b2 Q2.30 format + * int32_t coef_b1 Q2.30 format + * int32_t coef_b0 Q2.30 format + * int32_t output_shift number of shifts right, shift left is negative + * int32_t output_gain Q2.14 format + * <2nd biquad> + * ... + * <2nd EQ> + * + * Note: A flat response biquad can be made with a section set to + * b0 = 1.0, gain = 1.0, and other parameters set to 0 + * {0, 0, 0, 0, 1073741824, 0, 16484} + */ + +struct sof_eq_iir_config { + uint32_t size; + uint32_t channels_in_config; + uint32_t number_of_responses; + + /* reserved */ + uint32_t reserved[4]; + + int32_t data[]; /* eq_assign[channels], eq 0, eq 1, ... */ +} __packed; + +struct sof_eq_iir_header_df2t { + uint32_t num_sections; + uint32_t num_sections_in_series; + + /* reserved */ + uint32_t reserved[4]; + + int32_t biquads[]; /* Repeated biquad coefficients */ +} __packed; + +struct sof_eq_iir_biquad_df2t { + int32_t a2; /* Q2.30 */ + int32_t a1; /* Q2.30 */ + int32_t b2; /* Q2.30 */ + int32_t b1; /* Q2.30 */ + int32_t b0; /* Q2.30 */ + int32_t output_shift; /* Number of right shifts */ + int32_t output_gain; /* Q2.14 */ +} __packed; + +/* A full 22th order equalizer with 11 biquads cover octave bands 1-11 in + * in the 0 - 20 kHz bandwidth. + */ +#define SOF_EQ_IIR_DF2T_BIQUADS_MAX 11 + +/* The number of int32_t words in sof_eq_iir_header_df2t: + * num_sections, num_sections_in_series, reserved[4] + */ +#define SOF_EQ_IIR_NHEADER_DF2T \ + (sizeof(struct sof_eq_iir_header_df2t) / sizeof(int32_t)) + +/* The number of int32_t words in sof_eq_iir_biquad_df2t: + * a2, a1, b2, b1, b0, output_shift, output_gain + */ +#define SOF_EQ_IIR_NBIQUAD_DF2T \ + (sizeof(struct sof_eq_iir_biquad_df2t) / sizeof(int32_t)) + +#endif |