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https://github.com/espressif/esp-idf.git
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Ma Jing Jing
64 lines
4.3 KiB
C
64 lines
4.3 KiB
C
/*
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* SPDX-FileCopyrightText: 2026 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include "hal/asrc_periph.h"
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/**
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* @brief ASRC rate conversion configuration lookup table
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* Table structure: asrc_periph_rate_table[src_rate_index][dest_rate_index]
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* Rate index mapping: 0=8kHz, 1=16kHz, 2=24kHz, 3=32kHz, 4=44.1kHz, 5=48kHz
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*/
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const asrc_periph_rate_config_t asrc_periph_rate_table[6][6] = {
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{
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{1, 1, 1, 0, 0, 0, 0, 0, 0}, // 8k->8k (bypass)
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{1, 0, 1, 0, 0, 0, 0, 0, 0}, // 8k->16k (up_2)
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{0, 0, 0, 0, 0, 0, 4, 3, (int)(((1 << 20) + 3) / (2 * 3))}, // 8k->32k->24k (up_4 + frac: 4/3)
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{0, 0, 1, 0, 0, 0, 0, 0, 0}, // 8k->32k (up_4)
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{0, 0, 0, 0, 0, 0, 320, 441, (int)(((1 << 20) + 441) / (2 * 441))}, // 8k->32k->44.1k (up_4 + frac: 320/441)
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{0, 0, 0, 0, 0, 0, 2, 3, (int)(((1 << 20) + 3) / (2 * 3))} // 8k->32k->48k (up_4 + frac: 2/3)
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},
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{
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{1, 0, 1, 0, 1, 0, 0, 0, 0}, // 16k->8k (down_2)
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{1, 1, 1, 0, 0, 0, 0, 0, 0}, // 16k->16k (bypass)
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{1, 0, 0, 0, 0, 0, 4, 3, (int)(((1 << 20) + 3) / (2 * 3))}, // 16k->32k->24k (up_2 + frac: 4/3)
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{1, 0, 1, 0, 0, 0, 0, 0, 0}, // 16k->32k (up_2)
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{1, 0, 0, 0, 0, 0, 320, 441, (int)(((1 << 20) + 441) / (2 * 441))}, // 16k->32k->44.1k (up_2 + frac: 320/441)
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{1, 0, 0, 0, 0, 0, 2, 3, (int)(((1 << 20) + 3) / (2 * 3))} // 16k->32k->48k (up_2 + frac: 2/3)
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},
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{
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{0, 0, 0, 1, 1, 1, 3, 4, (int)(((1 << 20) + 4) / (2 * 4))}, // 24k->32k->8k (frac: 3/4 + down_4)
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{1, 0, 0, 0, 1, 1, 3, 4, (int)(((1 << 20) + 4) / (2 * 4))}, // 24k->32k->16k (frac: 3/4 + down_2)
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{1, 1, 1, 0, 0, 0, 0, 0, 0}, // 24k->24k (bypass)
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{1, 1, 0, 0, 0, 1, 3, 4, (int)(((1 << 20) + 4) / (2 * 4))}, // 24k->32k (frac: 3/4)
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{0, 0, 0, 0, 0, 0, 320, 147, (int)(((1 << 20) + 147) / (2 * 147))}, // 24k->96k->44.1k (up_4 + frac: 320/147)
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{1, 0, 1, 0, 0, 0, 0, 0, 0} // 24k->48k (up_2)
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},
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{
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{0, 0, 1, 1, 1, 0, 0, 0, 0}, // 32k->8k (down_4)
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{1, 0, 1, 0, 1, 0, 0, 0, 0}, // 32k->16k (down_2)
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{1, 1, 0, 0, 0, 0, 4, 3, (int)(((1 << 20) + 3) / (2 * 3))}, // 32k->24k (frac: 4/3)
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{1, 1, 1, 0, 0, 0, 0, 0, 0}, // 32k->32k (bypass)
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{1, 0, 0, 0, 0, 0, 640, 441, (int)(((1 << 20) + 441) / (2 * 441))}, // 32k->64k->44.1k (up_2 + frac: 640/441)
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{1, 0, 0, 0, 0, 0, 4, 3, (int)(((1 << 20) + 3) / (2 * 3))} // 32k->64k->48k (up_2 + frac: 4/3)
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},
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{
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{0, 0, 0, 1, 1, 1, 441, 320, (int)(((1 << 20) + 320) / (2 * 320))}, // 44.1k->32k->8k (frac: 441/320 + down_4)
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{1, 0, 0, 0, 1, 1, 441, 320, (int)(((1 << 20) + 320) / (2 * 320))}, // 44.1k->32k->16k (frac: 441/320 + down_2)
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{0, 0, 0, 1, 1, 1, 147, 320, (int)(((1 << 20) + 320) / (2 * 320))}, // 44.1k->96k->24k (frac: 147/320 + down_4)
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{1, 0, 0, 0, 1, 1, 441, 640, (int)(((1 << 20) + 640) / (2 * 640))}, // 44.1k->64k->32k (frac: 441/640 + down_2)
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{1, 1, 1, 0, 0, 0, 0, 0, 0}, // 44.1k->44.1k (bypass)
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{1, 0, 0, 0, 0, 0, 147, 80, (int)(((1 << 20) + 80) / (2 * 80))} // 44.1k->88.2k->48k (up_2 + frac: 147/80)
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},
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{
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{0, 0, 0, 1, 1, 1, 3, 2, (int)(((1 << 20) + 2) / (2 * 2))}, // 48k->32k->8k (frac: 3/2 + down_4)
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{1, 0, 0, 0, 1, 1, 3, 2, (int)(((1 << 20) + 2) / (2 * 2))}, // 48k->32k->16k (frac: 3/2 + down_2)
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{1, 0, 1, 0, 1, 0, 0, 0, 0}, // 48k->24k (down_2)
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{1, 0, 0, 0, 1, 1, 3, 4, (int)(((1 << 20) + 4) / (2 * 4))}, // 48k->64k->32k (frac: 3/4 + down_2)
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{1, 0, 0, 0, 1, 1, 80, 147, (int)(((1 << 20) + 147) / (2 * 147))}, // 48k->88.2k->44.1k (frac: 80/147 + down_2)
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{1, 1, 1, 0, 0, 0, 0, 0, 0} // 48k->48k (bypass)
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},
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};
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