kopia lustrzana https://github.com/OpenRTX/OpenRTX
437 wiersze
12 KiB
C
437 wiersze
12 KiB
C
/***************************************************************************
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* Copyright (C) 2022 - 2025 by Federico Amedeo Izzo IU2NUO, *
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* Niccolò Izzo IU2KIN *
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* Frederik Saraci IU2NRO *
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* Silvano Seva IU2KWO *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, see <http://www.gnu.org/licenses/> *
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***************************************************************************/
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#include <audio_stream.h>
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#include <audio_codec.h>
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#include <pthread.h>
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#include <threads.h>
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// codec2 system library has a weird include prefix
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#if defined(PLATFORM_LINUX)
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#include <codec2/codec2.h>
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#else
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#include <codec2.h>
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#endif
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <errno.h>
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#include <dsp.h>
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#define BUF_SIZE 4
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static pathId audioPath;
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static uint8_t initCnt = 0;
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static bool running;
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static bool reqStop;
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static pthread_t codecThread;
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static pthread_attr_t codecAttr;
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static pthread_mutex_t data_mutex = PTHREAD_MUTEX_INITIALIZER;
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static pthread_mutex_t init_mutex = PTHREAD_MUTEX_INITIALIZER;
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static pthread_cond_t wakeup_cond = PTHREAD_COND_INITIALIZER;
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static uint8_t readPos;
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static uint8_t writePos;
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static uint8_t numElements;
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static uint64_t dataBuffer[BUF_SIZE];
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#ifdef PLATFORM_MOD17
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static const uint8_t micGainPre = 4;
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static const uint8_t micGainPost = 3;
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#else
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#ifndef PLATFORM_LINUX
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static const uint8_t micGainPre = 8;
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static const uint8_t micGainPost = 4;
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#endif
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#endif
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static void *encodeFunc(void *arg);
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static void *decodeFunc(void *arg);
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static bool startThread(const pathId path, void *(*func) (void *));
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static void stopThread();
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void codec_init()
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{
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pthread_mutex_lock(&init_mutex);
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initCnt += 1;
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pthread_mutex_unlock(&init_mutex);
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if(initCnt > 0)
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return;
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running = false;
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readPos = 0;
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writePos = 0;
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numElements = 0;
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}
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void codec_terminate()
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{
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pthread_mutex_lock(&init_mutex);
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initCnt -= 1;
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pthread_mutex_unlock(&init_mutex);
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if(initCnt > 0)
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return;
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if(running)
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stopThread();
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}
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bool codec_startEncode(const pathId path)
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{
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return startThread(path, encodeFunc);
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}
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bool codec_startDecode(const pathId path)
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{
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return startThread(path, decodeFunc);
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}
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void codec_stop(const pathId path)
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{
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if(running == false)
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return;
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if(audioPath != path)
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return;
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stopThread();
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}
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bool codec_running()
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{
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return running;
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}
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int codec_popFrame(uint8_t *frame, const bool blocking)
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{
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if(running == false)
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return -EPERM;
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uint64_t element;
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// No data available and non-blocking call: just return false.
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if((numElements == 0) && (blocking == false))
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return -EAGAIN;
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// Blocking call: wait until some data is pushed
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pthread_mutex_lock(&data_mutex);
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while(numElements == 0)
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{
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pthread_cond_wait(&wakeup_cond, &data_mutex);
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}
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element = dataBuffer[readPos];
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readPos = (readPos + 1) % BUF_SIZE;
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numElements -= 1;
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pthread_mutex_unlock(&data_mutex);
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// Do memcpy after mutex unlock to reduce execution time spent inside the
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// critical section
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memcpy(frame, &element, 8);
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return 0;
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}
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int codec_pushFrame(const uint8_t *frame, const bool blocking)
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{
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if(running == false)
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return -EPERM;
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// Copy data to a temporary variable before mutex lock to reduce execution
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// time spent inside the critical section
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uint64_t element;
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memcpy(&element, frame, 8);
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// No space available and non-blocking call: return
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if((numElements >= BUF_SIZE) && (blocking == false))
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return -EAGAIN;
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// Blocking call: wait until there is some free space
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pthread_mutex_lock(&data_mutex);
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while(numElements >= BUF_SIZE)
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{
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pthread_cond_wait(&wakeup_cond, &data_mutex);
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}
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// There is free space, push data into the queue
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dataBuffer[writePos] = element;
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writePos = (writePos + 1) % BUF_SIZE;
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numElements += 1;
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pthread_mutex_unlock(&data_mutex);
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return 0;
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}
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static void *encodeFunc(void *arg)
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{
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streamId iStream;
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pathId iPath = *((pathId*) arg);
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stream_sample_t audioBuf[320];
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struct CODEC2 *codec2;
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filter_state_t dcrState;
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iStream = audioStream_start(iPath, audioBuf, 320, 8000,
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STREAM_INPUT | BUF_CIRC_DOUBLE);
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if(iStream < 0)
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{
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pthread_detach(pthread_self());
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running = false;
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return NULL;
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}
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dsp_resetFilterState(&dcrState);
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codec2 = codec2_create(CODEC2_MODE_3200);
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while(reqStop == false)
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{
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// Invalid path, quit
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if(audioPath_getStatus(iPath) != PATH_OPEN)
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break;
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dataBlock_t audio = inputStream_getData(iStream);
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if(audio.data == NULL)
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break;
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#ifndef PLATFORM_LINUX
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// Pre-amplification stage
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for(size_t i = 0; i < audio.len; i++) audio.data[i] *= micGainPre;
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// DC removal
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dsp_dcRemoval(&dcrState, audio.data, audio.len);
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// Post-amplification stage
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for(size_t i = 0; i < audio.len; i++) audio.data[i] *= micGainPost;
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#endif
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// CODEC2 encodes 160ms of speech into 8 bytes: here we write the
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// new encoded data into a buffer of 16 bytes writing the first
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// half and then the second one, sequentially.
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// Data ready flag is rised once all the 16 bytes contain new data.
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uint64_t frame = 0;
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codec2_encode(codec2, ((uint8_t*) &frame), audio.data);
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pthread_mutex_lock(&data_mutex);
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// If buffer is full erase the oldest frame
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if(numElements >= BUF_SIZE)
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{
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readPos = (readPos + 1) % BUF_SIZE;
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}
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dataBuffer[writePos] = frame;
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writePos = (writePos + 1) % BUF_SIZE;
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if(numElements == 0)
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pthread_cond_signal(&wakeup_cond);
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if(numElements < BUF_SIZE)
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numElements += 1;
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pthread_mutex_unlock(&data_mutex);
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}
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audioStream_terminate(iStream);
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codec2_destroy(codec2);
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// In case thread terminates due to invalid path or stream error, detach it
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// to ensure that its memory gets freed by the OS.
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if(reqStop == false)
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pthread_detach(pthread_self());
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running = false;
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return NULL;
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}
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static void *decodeFunc(void *arg)
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{
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streamId oStream;
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pathId oPath = *((pathId*) arg);
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stream_sample_t audioBuf[320];
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struct CODEC2 *codec2;
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// Open output stream
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memset(audioBuf, 0x00, 320 * sizeof(stream_sample_t));
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oStream = audioStream_start(oPath, audioBuf, 320, 8000,
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STREAM_OUTPUT | BUF_CIRC_DOUBLE);
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if(oStream < 0)
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{
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pthread_detach(pthread_self());
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running = false;
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return NULL;
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}
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codec2 = codec2_create(CODEC2_MODE_3200);
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// Ensure that thread start is correctly synchronized with the output
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// stream to avoid having the decode function writing in a memory area
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// being read at the same time by the output stream system causing cracking
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// noises at speaker output. Behaviour observed on both Module17 and MD-UV380
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outputStream_sync(oStream, false);
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while(reqStop == false)
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{
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// Invalid path, quit
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if(audioPath_getStatus(oPath) != PATH_OPEN)
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break;
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// Try popping data from the queue
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uint64_t frame = 0;
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bool newData = false;
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pthread_mutex_lock(&data_mutex);
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if(numElements != 0)
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{
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frame = dataBuffer[readPos];
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readPos = (readPos + 1) % BUF_SIZE;
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if(numElements >= BUF_SIZE)
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pthread_cond_signal(&wakeup_cond);
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numElements -= 1;
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newData = true;
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}
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pthread_mutex_unlock(&data_mutex);
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stream_sample_t *audioBuf = outputStream_getIdleBuffer(oStream);
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if(audioBuf == NULL)
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break;
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if(newData)
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{
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codec2_decode(codec2, audioBuf, ((uint8_t *) &frame));
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#ifdef PLATFORM_MD3x0
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// Bump up volume a little bit, as on MD3x0 is quite low
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for(size_t i = 0; i < 160; i++) audioBuf[i] *= 2;
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#endif
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}
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else
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{
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memset(audioBuf, 0x00, 160 * sizeof(stream_sample_t));
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}
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outputStream_sync(oStream, true);
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}
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// Stop stream and wait until its effective termination
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audioStream_stop(oStream);
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codec2_destroy(codec2);
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// In case thread terminates due to invalid path or stream error, detach it
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// to ensure that its memory gets freed by the OS.
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if(reqStop == false)
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pthread_detach(pthread_self());
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running = false;
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return NULL;
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}
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static bool startThread(const pathId path, void *(*func) (void *))
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{
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// Bad incoming path
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if(audioPath_getStatus(path) != PATH_OPEN)
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return false;
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// Handle access contention when starting the codec thread to ensure that
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// only one call at a time can effectively start the thread.
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pthread_mutex_lock(&init_mutex);
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if(running)
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{
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// Same path as before, path open, codec already running: all good.
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if(path == audioPath)
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{
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pthread_mutex_unlock(&init_mutex);
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return true;
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}
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// New path takes over the current one only if it has an higher priority
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// or the current one is closed/suspended.
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pathInfo_t newPath = audioPath_getInfo(path);
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pathInfo_t curPath = audioPath_getInfo(audioPath);
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if((curPath.status == PATH_OPEN) && (curPath.prio >= newPath.prio))
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{
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pthread_mutex_unlock(&init_mutex);
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return false;
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}
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else
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{
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stopThread();
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}
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}
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running = true;
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audioPath = path;
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pthread_mutex_unlock(&init_mutex);
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readPos = 0;
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writePos = 0;
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numElements = 0;
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reqStop = false;
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pthread_attr_init(&codecAttr);
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#if defined(_MIOSIX)
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// Set stack size of CODEC2 thread to 16kB.
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pthread_attr_setstacksize(&codecAttr, CODEC2_THREAD_STKSIZE);
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// Set priority of CODEC2 thread to the maximum one, the same of RTX thread.
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struct sched_param param;
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param.sched_priority = THREAD_PRIO_HIGH;
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pthread_attr_setschedparam(&codecAttr, ¶m);
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#elif defined(__ZEPHYR__)
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// Allocate and set the stack for CODEC2 thread
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void *codec_thread_stack = malloc(CODEC2_THREAD_STKSIZE * sizeof(uint8_t));
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pthread_attr_setstack(&codecAttr, codec_thread_stack, CODEC2_THREAD_STKSIZE);
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#endif
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// Start thread
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int ret = pthread_create(&codecThread, &codecAttr, func, &audioPath);
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if(ret < 0)
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running = false;
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return running;
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}
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static void stopThread()
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{
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reqStop = true;
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pthread_join(codecThread, NULL);
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running = false;
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#ifdef __ZEPHYR__
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void *addr;
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size_t size;
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pthread_attr_getstack(&codecAttr, &addr, &size);
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free(addr);
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#endif
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}
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