sr3_config_audio.h

/*$$$LICENCE_NORDIC_STANDARD<2016>$$$*/

#ifndef _SR3_CONFIG_AUDIO_H
#define _SR3_CONFIG_AUDIO_H

// Calculate audio parameters.
#if (CONFIG_AUDIO_CODEC == CONFIG_AUDIO_CODEC_ADPCM)
# define CONFIG_AUDIO_FRAME_SIZE_BYTES ((CONFIG_AUDIO_FRAME_SIZE_SAMPLES / 2) + 3)
#elif (CONFIG_AUDIO_CODEC == CONFIG_AUDIO_CODEC_BV32FP)
# define CONFIG_AUDIO_FRAME_SIZE_SAMPLES 80
# define CONFIG_AUDIO_FRAME_SIZE_BYTES 20
#elif (CONFIG_AUDIO_CODEC == CONFIG_AUDIO_CODEC_OPUS)
# define CONFIG_AUDIO_FRAME_SIZE_BYTES ((CONFIG_OPUS_BITRATE_LIMIT * CONFIG_AUDIO_FRAME_SIZE_SAMPLES / (8 * CONFIG_AUDIO_SAMPLING_FREQUENCY)) + ((CONFIG_OPUS_HEADER_ENABLED) ? 2 : 0))
# define CONFIG_OPUS_VBR_ENABLED ((CONFIG_OPUS_BITRATE_CFG & 0x01) == 0x00)
# define CONFIG_OPUS_BITRATE (CONFIG_OPUS_BITRATE_CFG & ~0x0F)
# if (CONFIG_OPUS_BITRATE > CONFIG_OPUS_BITRATE_LIMIT)
# error "Bitrate limit cannot be lower than selected codec bitrate"
# endif
#elif (CONFIG_AUDIO_CODEC == CONFIG_AUDIO_CODEC_SBC)
/*
 * See A2DP specification v1.3.1, page 70, 12.9 Calculation of Bit Rate and Frame Length.
 * Since MONO is the only mode used here, the size is calculated for one channel.
 *
 * Fixed settings used for mSBC are taken from "Hands-Free Profile 1.7",
 * page 115, section 5.7.4 "mSBC coding".
 */
# define CONFIG_AUDIO_FRAME_SIZE_SAMPLES (CONFIG_SBC_BLOCKS * CONFIG_SBC_SUBBANDS)
# define CONFIG_AUDIO_FRAME_SIZE_BYTES (4 + ((4 * CONFIG_SBC_SUBBANDS) / 8) + CEIL_DIV(CONFIG_SBC_BLOCKS * CONFIG_SBC_BITPOOL, 8))
# if (CONFIG_SBC_MODE == CONFIG_SBC_MODE_MSBC)
# define CONFIG_SBC_BLOCKS 15
# define CONFIG_SBC_SUBBANDS 8
# define CONFIG_SBC_ALLOCATION SBC_LOUDNESS
# define CONFIG_SBC_BITPOOL 26
# endif
#else
# error "Unsupported Compression"
#endif

#if (defined(CONFIG_AUDIO_FRAME_SIZE_SAMPLES) && !defined(CONFIG_AUDIO_FRAME_SIZE_MS))
# define CONFIG_AUDIO_FRAME_SIZE_MS (1000 * CONFIG_AUDIO_FRAME_SIZE_SAMPLES / CONFIG_AUDIO_SAMPLING_FREQUENCY)
#elif (defined(CONFIG_AUDIO_FRAME_SIZE_MS) && !defined(CONFIG_AUDIO_FRAME_SIZE_SAMPLES))
# define CONFIG_AUDIO_FRAME_SIZE_SAMPLES (CONFIG_AUDIO_FRAME_SIZE_MS * CONFIG_AUDIO_SAMPLING_FREQUENCY / 1000)
#else
# error "Either CONFIG_AUDIO_FRAME_SIZE_SAMPLES or CONFIG_AUDIO_FRAME_SIZE_MS has to be defined!"
#endif

// Create PDM configuration basing on audio settings.
#if (CONFIG_AUDIO_SAMPLING_FREQUENCY == 8000)
# define CONFIG_PDM_MCLKFREQ 0x04100000
# define CONFIG_AUDIO_REAL_SAMPLING_FREQUENCY 7936
#elif (CONFIG_AUDIO_SAMPLING_FREQUENCY == 16000)
# define CONFIG_PDM_MCLKFREQ 0x08400000
# define CONFIG_AUDIO_REAL_SAMPLING_FREQUENCY 16125
#elif (CONFIG_AUDIO_SAMPLING_FREQUENCY == 24000)
# define CONFIG_PDM_MCLKFREQ 0x0C000000
# define CONFIG_AUDIO_REAL_SAMPLING_FREQUENCY 23819
#elif (CONFIG_AUDIO_SAMPLING_FREQUENCY == 32000)
# define CONFIG_PDM_MCLKFREQ 0x10000000
# define CONFIG_AUDIO_REAL_SAMPLING_FREQUENCY 31250
#else
# error "Unsuppored CONFIG_AUDIO_SAMPLING_FREQUENCY value!"
#endif

#if CONFIG_AUDIO_ANR_ENABLED
# define CONFIG_PDM_BUFFER_SIZE_SAMPLES (2 * CONFIG_AUDIO_FRAME_SIZE_SAMPLES)
#else /* !CONFIG_AUDIO_ANR_ENABLED */
# define CONFIG_PDM_BUFFER_SIZE_SAMPLES (1 * CONFIG_AUDIO_FRAME_SIZE_SAMPLES)
#endif /* CONFIG_AUDIO_ANR_ENABLED */

// Calculate stack size.
#if CONFIG_AUDIO_ENABLED
# if (CONFIG_AUDIO_CODEC == CONFIG_AUDIO_CODEC_BV32FP)
# define CONFIG_STACK_SIZE_AUDIO CONFIG_STACK_SIZE_AUDIO_BV32FP
# elif ((CONFIG_AUDIO_CODEC == CONFIG_AUDIO_CODEC_OPUS) && (CONFIG_OPUS_MODE == CONFIG_OPUS_MODE_CELT))
# define CONFIG_STACK_SIZE_AUDIO CONFIG_STACK_SIZE_AUDIO_OPUS_CELT
# elif ((CONFIG_AUDIO_CODEC == CONFIG_AUDIO_CODEC_OPUS) && (CONFIG_OPUS_MODE == CONFIG_OPUS_MODE_SILK))
# define CONFIG_STACK_SIZE_AUDIO CONFIG_STACK_SIZE_AUDIO_OPUS_SILK
# else
# define CONFIG_STACK_SIZE_AUDIO 0
# endif
#else /* !CONFIG_AUDIO_ENABLED */
# define CONFIG_STACK_SIZE_AUDIO 0
#endif /* CONFIG_AUDIO_ENABLED */

#if defined(CONFIG_BOARD_NRF52832_PCA20023) || defined(CONFIG_BOARD_NRF52810_PCA20031)
# if !CONFIG_PDM_MIC_PWR_CTRL_ENABLED
# error "Product Example devices require control over microphone power line to be enabled."
# endif
#endif

#endif /* _SR3_CONFIG_AUDIO_H */