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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,271 @@ | ||
| /* | ||
| Copyright (C) 2023 Brian Weiss | ||
| This file is part of RALibretro. | ||
| RALibretro is free software: you can redistribute it and/or modify | ||
| it under the terms of the GNU General Public License as published by | ||
| the Free Software Foundation, either version 3 of the License, or | ||
| (at your option) any later version. | ||
| RALibretro is distributed in the hope that it will be useful, | ||
| but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| GNU General Public License for more details. | ||
| You should have received a copy of the GNU General Public License | ||
| along with RALibretro. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
|
|
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| #include "Microphone.h" | ||
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| #include "Application.h" | ||
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| #include <SDL_audio.h> | ||
| #include "speex/speex_resampler.h" | ||
|
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| #define TAG "[MIC] " | ||
|
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| struct Microphone::SDLData | ||
| { | ||
| SDL_AudioDeviceID deviceId; | ||
| SDL_AudioSpec deviceSpec; | ||
| unsigned coreRate; | ||
| bool enabled; | ||
| Fifo fifo; | ||
| libretro::LoggerComponent* logger; | ||
| SpeexResamplerState* resampler; | ||
| }; | ||
|
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| bool Microphone::init(libretro::LoggerComponent* logger) | ||
| { | ||
| _logger = logger; | ||
| return true; | ||
| } | ||
|
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| void Microphone::destroy() | ||
| { | ||
| if (_data) | ||
| closeMic((retro_microphone_t*)_data); | ||
| } | ||
|
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| void Microphone::recordCallback(void* data, Uint8* stream, int len) | ||
| { | ||
| SDLData* sdlData = (SDLData*)data; | ||
|
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| if (!sdlData->enabled) /* don't fill buffer when mic is not active, nothing is going to read the buffer */ | ||
| return; | ||
|
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| extern Application app; | ||
| if (app.isPaused()) /* don't fill buffer while paused, nothing is running to empty buffer */ | ||
| return; | ||
|
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| int frames = len / sizeof(int16_t); | ||
| int16_t* samples = (int16_t*)stream; | ||
|
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| size_t output_size; | ||
| int16_t* output; | ||
|
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| if (sdlData->deviceSpec.freq == sdlData->coreRate) | ||
| { | ||
| /* no resampling needed */ | ||
| output = (int16_t*)samples; | ||
| output_size = frames * sizeof(int16_t); | ||
| } | ||
| else | ||
| { | ||
| /* allocate output buffer */ | ||
| spx_uint32_t out_len = (spx_uint32_t)ceil(frames * sdlData->coreRate / sdlData->deviceSpec.freq); | ||
| output_size = out_len * sizeof(int16_t); | ||
| output = (int16_t*)alloca(output_size); | ||
|
|
||
| if (output == NULL) | ||
| { | ||
| sdlData->logger->error(TAG "Error allocating audio resampling output buffer"); | ||
| return; | ||
| } | ||
|
|
||
| /* do the resampling */ | ||
| int error; | ||
| if (!sdlData->resampler) | ||
| { | ||
| sdlData->resampler = speex_resampler_init(1, sdlData->deviceSpec.freq, sdlData->coreRate, SPEEX_RESAMPLER_QUALITY_DEFAULT, &error); | ||
|
|
||
| if (!sdlData->resampler) | ||
| { | ||
| sdlData->logger->error(TAG "speex_resampler_init: %s", speex_resampler_strerror(error)); | ||
| SDL_PauseAudioDevice(sdlData->deviceId, true); | ||
| return; | ||
| } | ||
| } | ||
|
|
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| spx_uint32_t in_frames = frames; | ||
| spx_uint32_t out_frames = out_len; | ||
| sdlData->logger->debug(TAG "Resampling %u samples to %u", in_frames, out_frames); | ||
| error = speex_resampler_process_int(sdlData->resampler, 0, (const int16_t*)samples, &in_frames, output, &out_frames); | ||
| if (error == RESAMPLER_ERR_SUCCESS) | ||
| { | ||
| /* update with the actual number of frames created */ | ||
| output_size = out_frames * sizeof(int16_t); | ||
| } | ||
| else | ||
| { | ||
| memset(output, 0, output_size); | ||
| sdlData->logger->error(TAG "speex_resampler_process_int: %s", speex_resampler_strerror(error)); | ||
| } | ||
| } | ||
|
|
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| /* flush to FIFO queue */ | ||
| size_t avail = sdlData->fifo.free(); | ||
| if (avail < output_size) | ||
| { | ||
| sdlData->logger->debug(TAG "Waiting for FIFO (need %zu bytes but only %zu available), sleeping", output_size, avail); | ||
|
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| const int MAX_WAIT = 250; | ||
| int tries = MAX_WAIT; | ||
| do | ||
| { | ||
| SDL_Delay(1); | ||
| if (!sdlData->enabled) | ||
| return; | ||
|
|
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| avail = sdlData->fifo.free(); | ||
| if (avail >= output_size) | ||
| break; | ||
|
|
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| /* prevent infinite loop if fifo full */ | ||
| if (--tries == 0) | ||
| { | ||
| sdlData->logger->debug(TAG "FIFO still full after %dms, flushing", MAX_WAIT); | ||
| sdlData->fifo.reset(); | ||
| avail = sdlData->fifo.free(); | ||
| break; | ||
| } | ||
| } while (true); | ||
|
|
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| if (avail < output_size) | ||
| output_size = avail; | ||
| } | ||
|
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| sdlData->fifo.write(output, output_size); | ||
| } | ||
|
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| retro_microphone_t* Microphone::openMic(const retro_microphone_params_t* params) | ||
| { | ||
| if (_data != NULL) /* only one microphone allowed at a time*/ | ||
| return NULL; | ||
|
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| SDLData* data = new SDLData(); | ||
| if (data == NULL) | ||
| return NULL; | ||
|
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| data->logger = _logger; | ||
| data->resampler = nullptr; | ||
| data->coreRate = params->rate; | ||
| data->enabled = false; | ||
|
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| SDL_AudioSpec desired_spec {}; | ||
| desired_spec.freq = params->rate; | ||
| desired_spec.format = AUDIO_S16SYS; | ||
| desired_spec.channels = 1; /* Microphones only usually provide input in mono */ | ||
| desired_spec.samples = 2048; | ||
| desired_spec.userdata = data; | ||
| desired_spec.callback = recordCallback; | ||
|
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| data->deviceId = SDL_OpenAudioDevice(NULL, true, &desired_spec, &data->deviceSpec, | ||
| SDL_AUDIO_ALLOW_FREQUENCY_CHANGE); | ||
|
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| if (data->deviceId == 0) | ||
| { | ||
| _logger->error(TAG "Failed to open SDL audio input device: %s", SDL_GetError()); | ||
| delete data; | ||
| return NULL; | ||
| } | ||
|
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| _logger->info(TAG "Opened microphone with ID %u (frequency %u [requested %u])", data->deviceId, data->deviceSpec.freq, desired_spec.freq); | ||
| _logger->info(TAG "Microphone audio format: %u-bit %s %s %s endian\n", | ||
| SDL_AUDIO_BITSIZE(data->deviceSpec.format), | ||
| SDL_AUDIO_ISSIGNED(data->deviceSpec.format) ? "signed" : "unsigned", | ||
| SDL_AUDIO_ISFLOAT(data->deviceSpec.format) ? "floating-point" : "integer", | ||
| SDL_AUDIO_ISBIGENDIAN(data->deviceSpec.format) ? "big" : "little"); | ||
|
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| data->fifo.init(data->deviceSpec.size * 4); | ||
| _data = data; | ||
| return (retro_microphone_t*)data; | ||
| } | ||
|
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| void Microphone::closeMic(retro_microphone_t* microphone) | ||
| { | ||
| if ((SDLData*)microphone == _data) | ||
| { | ||
| SDL_CloseAudioDevice(_data->deviceId); | ||
| _data->fifo.destroy(); | ||
|
|
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| if (_data->resampler != NULL) | ||
| speex_resampler_destroy(_data->resampler); | ||
|
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| delete _data; | ||
| _data = NULL; | ||
| } | ||
| } | ||
|
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| bool Microphone::getMicParams(const retro_microphone_t* microphone, retro_microphone_params_t* params) | ||
| { | ||
| if (!_data) | ||
| return false; | ||
|
|
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| params->rate = _data->deviceSpec.freq; | ||
| return true; | ||
| } | ||
|
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| bool Microphone::getMicState(const retro_microphone_t* microphone) | ||
| { | ||
| return _data && _data->enabled; | ||
| } | ||
|
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| bool Microphone::setMicState(retro_microphone_t* microphone, bool state) | ||
| { | ||
| if (!_data) | ||
| return false; | ||
|
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| SDL_PauseAudioDevice(_data->deviceId, !state); | ||
| if (state) | ||
| { | ||
| if (SDL_GetAudioDeviceStatus(_data->deviceId) != SDL_AUDIO_PLAYING) | ||
| { | ||
| _logger->warn(TAG "Failed to start microphone %u: %s", _data->deviceId, SDL_GetError()); | ||
| return false; | ||
| } | ||
| } | ||
| else | ||
| { | ||
| switch (SDL_GetAudioDeviceStatus(_data->deviceId)) | ||
| { | ||
| case SDL_AUDIO_PLAYING: | ||
| _logger->warn(TAG "Failed to pause microphone %u: %s", _data->deviceId, SDL_GetError()); | ||
| return false; | ||
| case SDL_AUDIO_STOPPED: | ||
| _logger->warn(TAG "Microphone %u has been stopped and may not start again: %s", _data->deviceId, SDL_GetError()); | ||
| return false; | ||
| default: | ||
| break; | ||
| } | ||
|
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| _data->fifo.reset(); | ||
| } | ||
|
|
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| _data->enabled = state; | ||
| return true; | ||
| } | ||
|
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| int Microphone::readMic(retro_microphone_t* microphone, int16_t* frames, size_t num_frames) | ||
| { | ||
| if (!_data || !_data->enabled) | ||
| return 0; | ||
|
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| size_t num_read = std::min(num_frames, _data->fifo.occupied() / sizeof(int16_t)); | ||
| _data->fifo.read(frames, num_read * sizeof(int16_t)); | ||
| return (int)num_read; | ||
| } | ||
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