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Diffstat (limited to 'shared-module/audiomixer/Mixer.c')
| -rw-r--r-- | shared-module/audiomixer/Mixer.c | 428 |
1 files changed, 428 insertions, 0 deletions
diff --git a/shared-module/audiomixer/Mixer.c b/shared-module/audiomixer/Mixer.c new file mode 100644 index 000000000..e0fb4fab8 --- /dev/null +++ b/shared-module/audiomixer/Mixer.c @@ -0,0 +1,428 @@ +/* + * This file is part of the Micro Python project, http://micropython.org/ + * + * The MIT License (MIT) + * + * Copyright (c) 2018 Scott Shawcroft for Adafruit Industries + * 2018 DeanM for Adafruit Industries + * 2019 Michael Schroeder + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +#include "shared-bindings/audiomixer/Mixer.h" +#include "shared-bindings/audiomixer/MixerVoice.h" + +#include <stdint.h> + +#include "py/runtime.h" +#include "shared-module/audiocore/__init__.h" +#include "shared-module/audiocore/RawSample.h" + +void common_hal_audiomixer_mixer_construct(audiomixer_mixer_obj_t* self, + uint8_t voice_count, + uint32_t buffer_size, + uint8_t bits_per_sample, + bool samples_signed, + uint8_t channel_count, + uint32_t sample_rate) { + self->len = buffer_size / 2 / sizeof(uint32_t) * sizeof(uint32_t); + + self->first_buffer = m_malloc(self->len, false); + if (self->first_buffer == NULL) { + common_hal_audiomixer_mixer_deinit(self); + mp_raise_msg(&mp_type_MemoryError, translate("Couldn't allocate first buffer")); + } + + self->second_buffer = m_malloc(self->len, false); + if (self->second_buffer == NULL) { + common_hal_audiomixer_mixer_deinit(self); + mp_raise_msg(&mp_type_MemoryError, translate("Couldn't allocate second buffer")); + } + + self->bits_per_sample = bits_per_sample; + self->samples_signed = samples_signed; + self->channel_count = channel_count; + self->sample_rate = sample_rate; + self->voice_count = voice_count; +} + +void common_hal_audiomixer_mixer_deinit(audiomixer_mixer_obj_t* self) { + self->first_buffer = NULL; + self->second_buffer = NULL; +} + +bool common_hal_audiomixer_mixer_deinited(audiomixer_mixer_obj_t* self) { + return self->first_buffer == NULL; +} + +uint32_t common_hal_audiomixer_mixer_get_sample_rate(audiomixer_mixer_obj_t* self) { + return self->sample_rate; +} + +bool common_hal_audiomixer_mixer_get_playing(audiomixer_mixer_obj_t* self) { + for (uint8_t v = 0; v < self->voice_count; v++) { + if (common_hal_audiomixer_mixervoice_get_playing(MP_OBJ_TO_PTR(self->voice[v]))) { + return true; + } + } + return false; +} + +void audiomixer_mixer_reset_buffer(audiomixer_mixer_obj_t* self, + bool single_channel, + uint8_t channel) { + for (uint8_t i = 0; i < self->voice_count; i++) { + common_hal_audiomixer_mixervoice_stop(self->voice[i]); + } +} + +uint32_t add8signed(uint32_t a, uint32_t b) { + #if (defined (__ARM_ARCH_7EM__) && (__ARM_ARCH_7EM__ == 1)) //Cortex-M4 w/FPU + return __SHADD8(a, b); + #else + uint32_t result = 0; + for (int8_t i = 0; i < 4; i++) { + int8_t ai = a >> (sizeof(int8_t) * 8 * i); + int8_t bi = b >> (sizeof(int8_t) * 8 * i); + int32_t intermediate = (int32_t) ai + bi / 2; + if (intermediate > CHAR_MAX) { + intermediate = CHAR_MAX; + } else if (intermediate < CHAR_MIN) { + intermediate = CHAR_MIN; + } + result |= ((uint32_t) intermediate & 0xff) << (sizeof(int8_t) * 8 * i); + } + return result; + #endif +} + +uint32_t add8unsigned(uint32_t a, uint32_t b) { + #if (defined (__ARM_ARCH_7EM__) && (__ARM_ARCH_7EM__ == 1)) //Cortex-M4 w/FPU + return __UHADD8(a, b); + #else + uint32_t result = 0; + for (int8_t i = 0; i < 4; i++) { + uint8_t ai = (a >> (sizeof(uint8_t) * 8 * i)); + uint8_t bi = (b >> (sizeof(uint8_t) * 8 * i)); + int32_t intermediate = (int32_t) (ai + bi) / 2; + if (intermediate > UCHAR_MAX) { + intermediate = UCHAR_MAX; + } + result |= ((uint32_t) intermediate & 0xff) << (sizeof(uint8_t) * 8 * i); + } + return result; + #endif +} + +uint32_t add16signed(uint32_t a, uint32_t b) { + #if (defined (__ARM_ARCH_7EM__) && (__ARM_ARCH_7EM__ == 1)) //Cortex-M4 w/FPU + return __SHADD16(a, b); + #else + uint32_t result = 0; + for (int8_t i = 0; i < 2; i++) { + int16_t ai = a >> (sizeof(int16_t) * 8 * i); + int16_t bi = b >> (sizeof(int16_t) * 8 * i); + int32_t intermediate = (int32_t) ai + bi / 2; + if (intermediate > SHRT_MAX) { + intermediate = SHRT_MAX; + } else if (intermediate < SHRT_MIN) { + intermediate = SHRT_MIN; + } + result |= (((uint32_t) intermediate) & 0xffff) << (sizeof(int16_t) * 8 * i); + } + return result; + #endif +} + +uint32_t add16unsigned(uint32_t a, uint32_t b) { + #if (defined (__ARM_ARCH_7EM__) && (__ARM_ARCH_7EM__ == 1)) //Cortex-M4 w/FPU + return __UHADD16(a, b); + #else + uint32_t result = 0; + for (int8_t i = 0; i < 2; i++) { + int16_t ai = (a >> (sizeof(uint16_t) * 8 * i)) - 0x8000; + int16_t bi = (b >> (sizeof(uint16_t) * 8 * i)) - 0x8000; + int32_t intermediate = (int32_t) ai + bi / 2; + if (intermediate > USHRT_MAX) { + intermediate = USHRT_MAX; + } + result |= ((uint32_t) intermediate & 0xffff) << (sizeof(int16_t) * 8 * i); + } + return result; + #endif +} + +static inline uint32_t mult8unsigned(uint32_t val, int32_t mul) { + // if mul == 0, no need in wasting cycles + if (mul == 0) { + return 0; + } + /* TODO: workout ARMv7 instructions + #if (defined (__ARM_ARCH_7EM__) && (__ARM_ARCH_7EM__ == 1)) //Cortex-M4 w/FPU + return val; + #else*/ + uint32_t result = 0; + float mod_mul = (float) mul / (float) ((1<<15)-1); + for (int8_t i = 0; i < 4; i++) { + uint8_t ai = val >> (sizeof(uint8_t) * 8 * i); + int32_t intermediate = ai * mod_mul; + if (intermediate > SHRT_MAX) { + intermediate = SHRT_MAX; + } + result |= ((uint32_t) intermediate & 0xff) << (sizeof(uint8_t) * 8 * i); + } + + return result; + //#endif +} + +static inline uint32_t mult8signed(uint32_t val, int32_t mul) { + // if mul == 0, no need in wasting cycles + if (mul == 0) { + return 0; + } + /* TODO: workout ARMv7 instructions + #if (defined (__ARM_ARCH_7EM__) && (__ARM_ARCH_7EM__ == 1)) //Cortex-M4 w/FPU + return val; + #else + */ + uint32_t result = 0; + float mod_mul = (float)mul / (float)((1<<15)-1); + for (int8_t i = 0; i < 4; i++) { + int16_t ai = val >> (sizeof(int8_t) * 8 * i); + int32_t intermediate = ai * mod_mul; + if (intermediate > CHAR_MAX) { + intermediate = CHAR_MAX; + } else if (intermediate < CHAR_MIN) { + intermediate = CHAR_MIN; + } + result |= (((uint32_t) intermediate) & 0xff) << (sizeof(int16_t) * 8 * i); + } + return result; + //#endif +} + +//TODO: +static inline uint32_t mult16unsigned(uint32_t val, int32_t mul) { + // if mul == 0, no need in wasting cycles + if (mul == 0) { + return 0; + } + /* TODO: the below ARMv7m instructions "work", but the amplitude is much higher/louder + #if (defined (__ARM_ARCH_7EM__) && (__ARM_ARCH_7EM__ == 1)) //Cortex-M4 w/FPU + // there is no unsigned equivalent to the 'SMULWx' ARMv7 Thumb function, + // so we have to do it by hand. + uint32_t lo = val & 0xffff; + uint32_t hi = val >> 16; + //mp_printf(&mp_plat_print, "pre-asm: (mul: %d)\n\tval: %x\tlo: %x\thi: %x\n", mul, val, lo, hi); + uint32_t val_lo; + asm volatile("mul %0, %1, %2" : "=r" (val_lo) : "r" (mul), "r" (lo)); + asm volatile("mla %0, %1, %2, %3" : "=r" (val) : "r" (mul), "r" (hi), "r" (val_lo)); + //mp_printf(&mp_plat_print, "post-asm:\n\tval: %x\tlo: %x\n\n", val, val_lo); + return val; + #else + */ + uint32_t result = 0; + float mod_mul = (float)mul / (float)((1<<15)-1); + for (int8_t i = 0; i < 2; i++) { + int16_t ai = (val >> (sizeof(uint16_t) * 8 * i)) - 0x8000; + int32_t intermediate = ai * mod_mul; + if (intermediate > SHRT_MAX) { + intermediate = SHRT_MAX; + } else if (intermediate < SHRT_MIN) { + intermediate = SHRT_MIN; + } + result |= (((uint32_t) intermediate) + 0x8000) << (sizeof(int16_t) * 8 * i); + } + return result; + //#endif +} + +static inline uint32_t mult16signed(uint32_t val, int32_t mul) { + // if mul == 0, no need in wasting cycles + if (mul == 0) { + return 0; + } + #if (defined (__ARM_ARCH_7EM__) && (__ARM_ARCH_7EM__ == 1)) //Cortex-M4 w/FPU + int32_t hi, lo; + int32_t bits = 16; // saturate to 16 bits + int32_t shift = 0; // shift is done automatically + asm volatile("smulwb %0, %1, %2" : "=r" (lo) : "r" (mul), "r" (val)); + asm volatile("smulwt %0, %1, %2" : "=r" (hi) : "r" (mul), "r" (val)); + asm volatile("ssat %0, %1, %2, asr %3" : "=r" (lo) : "I" (bits), "r" (lo), "I" (shift)); + asm volatile("ssat %0, %1, %2, asr %3" : "=r" (hi) : "I" (bits), "r" (hi), "I" (shift)); + asm volatile("pkhbt %0, %1, %2, lsl #16" : "=r" (val) : "r" (lo), "r" (hi)); // pack + return val; + #else + uint32_t result = 0; + float mod_mul = (float)mul / (float)((1<<15)-1); + for (int8_t i = 0; i < 2; i++) { + int16_t ai = val >> (sizeof(int16_t) * 8 * i); + int32_t intermediate = ai * mod_mul; + if (intermediate > SHRT_MAX) { + intermediate = SHRT_MAX; + } else if (intermediate < SHRT_MIN) { + intermediate = SHRT_MIN; + } + result |= (((uint32_t) intermediate) & 0xffff) << (sizeof(int16_t) * 8 * i); + } + return result; + #endif +} + +audioio_get_buffer_result_t audiomixer_mixer_get_buffer(audiomixer_mixer_obj_t* self, + bool single_channel, + uint8_t channel, + uint8_t** buffer, + uint32_t* buffer_length) { + if (!single_channel) { + channel = 0; + } + + uint32_t channel_read_count = self->left_read_count; + if (channel == 1) { + channel_read_count = self->right_read_count; + } + *buffer_length = self->len; + + bool need_more_data = self->read_count == channel_read_count; + if (need_more_data) { + uint32_t* word_buffer; + if (self->use_first_buffer) { + *buffer = (uint8_t*) self->first_buffer; + word_buffer = self->first_buffer; + } else { + *buffer = (uint8_t*) self->second_buffer; + word_buffer = self->second_buffer; + } + self->use_first_buffer = !self->use_first_buffer; + bool voices_active = false; + for (int32_t v = 0; v < self->voice_count; v++) { + audiomixer_mixervoice_obj_t* voice = MP_OBJ_TO_PTR(self->voice[v]); + + uint32_t j = 0; + bool voice_done = voice->sample == NULL; + for (uint32_t i = 0; i < self->len / sizeof(uint32_t); i++) { + if (!voice_done && j >= voice->buffer_length) { + if (!voice->more_data) { + if (voice->loop) { + audiosample_reset_buffer(voice->sample, false, 0); + } else { + voice->sample = NULL; + voice_done = true; + } + } + if (!voice_done) { + // Load another buffer + audioio_get_buffer_result_t result = audiosample_get_buffer(voice->sample, false, 0, (uint8_t**) &voice->remaining_buffer, &voice->buffer_length); + // Track length in terms of words. + voice->buffer_length /= sizeof(uint32_t); + voice->more_data = result == GET_BUFFER_MORE_DATA; + j = 0; + } + } + // First active voice gets copied over verbatim. + uint32_t sample_value; + if (voice_done) { + // Exit early if another voice already set all samples once. + if (voices_active) { + continue; + } + sample_value = 0; + if (!self->samples_signed) { + if (self->bits_per_sample == 8) { + sample_value = 0x7f7f7f7f; + } else { + sample_value = 0x7fff7fff; + } + } + } else { + sample_value = voice->remaining_buffer[j]; + } + + // apply the mixer level + if (!self->samples_signed) { + if (self->bits_per_sample == 8) { + sample_value = mult8unsigned(sample_value, voice->level); + } else { + sample_value = mult16unsigned(sample_value, voice->level); + } + } else { + if (self->bits_per_sample == 8) { + sample_value = mult8signed(sample_value, voice->level); + } else { + sample_value = mult16signed(sample_value, voice->level); + } + } + + if (!voices_active) { + word_buffer[i] = sample_value; + } else { + if (self->bits_per_sample == 8) { + if (self->samples_signed) { + word_buffer[i] = add8signed(word_buffer[i], sample_value); + } else { + word_buffer[i] = add8unsigned(word_buffer[i], sample_value); + } + } else { + if (self->samples_signed) { + word_buffer[i] = add16signed(word_buffer[i], sample_value); + } else { + word_buffer[i] = add16unsigned(word_buffer[i], sample_value); + } + } + } + j++; + } + voice->buffer_length -= j; + voice->remaining_buffer += j; + + voices_active = true; + } + + self->read_count += 1; + } else if (!self->use_first_buffer) { + *buffer = (uint8_t*) self->first_buffer; + } else { + *buffer = (uint8_t*) self->second_buffer; + } + + + if (channel == 0) { + self->left_read_count += 1; + } else if (channel == 1) { + self->right_read_count += 1; + *buffer = *buffer + self->bits_per_sample / 8; + } + return GET_BUFFER_MORE_DATA; +} + +void audiomixer_mixer_get_buffer_structure(audiomixer_mixer_obj_t* self, bool single_channel, + bool* single_buffer, bool* samples_signed, + uint32_t* max_buffer_length, uint8_t* spacing) { + *single_buffer = false; + *samples_signed = self->samples_signed; + *max_buffer_length = self->len; + if (single_channel) { + *spacing = self->channel_count; + } else { + *spacing = 1; + } +} |