esp8266 mp3 esp8266 语音播放 //Priorities of the reade

文件名称: esp8266 mp3

所属分类: C

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文件大小: 1mb

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上传时间: 2017-09-12

提供者: qq_25******

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详细说明： esp8266 语音播放 //Priorities of the reader and the decoder thread. Higher = higher prio. #define PRIO_READER 11 #define PRIO_MAD 1 //The mp3 read buffer size. 2106 bytes should be enough for up to 48KHz mp3s according to the sox sources. Used by libmad. #def ine READBUFSZ (2106) static char readBuf[READBUFSZ]; static long bufUnderrunCt; //Reformat the 16-bit mono sample to a format we can send to I2S. static int sampToI2s(short s) { //We can send a 32-bit sample to the I2S subsystem and the DAC will neatly split it up in 2 //16-bit analog values, one for left and one for right. //Duplicate 16-bit sample to both the L and R channel int samp=s; samp=(samp)&0xffff; samp=(samp<<16)|samp; return samp; } //Array with 32-bit values which have one bit more set to '1' in every consecutive array index value const unsigned int ICACHE_RODATA_ATTR fakePwm[]={ 0x00000010, 0x00000410, 0x00400410, 0x00400C10, 0x00500C10, 0x00D00C10, 0x20D00C10, 0x21D00C10, 0x21D80C10, 0xA1D80C10, 0xA1D80D10, 0xA1D80D30, 0xA1DC0D30, 0xA1DC8D30, 0xB1DC8D30, 0xB9DC8D30, 0xB9FC8D30, 0xBDFC8D30, 0xBDFE8D30, 0xBDFE8D32, 0xBDFE8D33, 0xBDFECD33, 0xFDFECD33, 0xFDFECD73, 0xFDFEDD73, 0xFFFEDD73, 0xFFFEDD7B, 0xFFFEFD7B, 0xFFFFFD7B, 0xFFFFFDFB, 0xFFFFFFFB, 0xFFFFFFFF}; static int sampToI2sPwm(short s) { //Okay, when this is enabled it means a speaker is connected *directly* to the data output. Instead of //having a nice PCM signal, we fake a PWM signal here. static int err=0; int samp=s; samp=(samp+32768); //to unsigned samp-=err; //Add the error we made when rounding the previous sample (error diffusion) //clip value if (samp>65535) samp=65535; if (samp<0) samp=0; //send pwm value for sample value samp=fakePwm[samp>>11]; err=(samp&0x7ff); //Save rounding error. return samp; } //2nd order delta-sigma DAC //See http://www.beis.de/Elektronik/DeltaSigma/DeltaSigma.html for a nice explanation static int sampToI2sDeltaSigma(short s) { int x; int val=0; int w; static int i1v=0, i2v=0; static int outReg=0; for (x=0; x<32; x++) { val<<=1; //next bit w=s; if (outReg>0) w-=32767; else w+=32767; //Difference 1 w+=i1v; i1v=w; //Integrator 1 if (outReg>0) w-=32767; else w+=32767; //Difference 2 w+=i2v; i2v=w; //Integrator 2 outReg=w; //register if (w>0) val|=1; //comparator } return val; } //Calculate the number of samples that we add or delete. Added samples means a slightly lower //playback rate, deleted samples means we increase playout speed a bit. This returns an //8.24 fixed-point number int recalcAddDelSamp(int oldVal) { int ret; long prevUdr=0; static int cnt; int i; static int minFifoFill=0; i=spiRamFifoFill(); if (i(1<<24)) { sampErr-=(1<<24); //...and don't output an i2s sample } else if (sampErr<-(1<<24)) { sampErr+=(1<<24); //..and output 2 samples instead of one. i2sPushSample(samp); i2sPushSample(samp); } else { //Just output the sample. i2sPushSample(samp); } } } //Called by the NXP modificationss of libmad. Sets the needed output sample rate. static oldRate=0; void ICACHE_FLASH_ATTR set_dac_sample_rate(int rate) { if (rate==oldRate) return; oldRate=rate; printf("Rate %d\n", rate); #ifdef ALLOW_VARY_SAMPLE_BITS i2sSetRate(rate, 0); #else i2sSetRate(rate, 1); #endif } static enum mad_flow ICACHE_FLASH_ATTR input(struct mad_stream *stream) { int n, i; int rem, fifoLen; //Shift remaining contents of buf to the front rem=stream->bufend-stream->next_frame; memmove(readBuf, stream->next_frame, rem); while (remerror, mad_stream_errorstr(stream)); return MAD_FLOW_CONTINUE; } //This is the main mp3 decoding task. It will grab data from the input buffer FIFO in the SPI ram and //output it to the I2S port. void ICACHE_FLASH_ATTR tskmad(void *pvParameters) { int r; struct mad_stream *stream; struct mad_frame *frame; struct mad_synth *synth; //Allocate structs needed for mp3 decoding stream=malloc(sizeof(struct mad_stream)); frame=malloc(sizeof(struct mad_frame)); synth=malloc(sizeof(struct mad_synth)); if (stream==NULL) { printf("MAD: malloc(stream) failed\n"); return; } if (synth==NULL) { printf("MAD: malloc(synth) failed\n"); return; } if (frame==NULL) { printf("MAD: malloc(frame) failed\n"); return; } //Initialize I2S i2sInit(); bufUnderrunCt=0; printf("MAD: Decoder start.\n"); //Initialize mp3 parts mad_stream_init(stream); mad_frame_init(frame); mad_synth_init(synth); while(1) { input(stream); //calls mad_stream_buffer internally while(1) { r=mad_frame_decode(frame, stream); if (r==-1) { if (!MAD_RECOVERABLE(stream->error)) { //We're most likely out of buffer and need to call input() again break; } error(NULL, stream, frame); continue; } mad_synth_frame(synth, frame); } } } int getIpForHost(const char *host, struct sockaddr_in *ip) { struct hostent *he; struct in_addr **addr_list; he=gethostbyname(host); if (he==NULL) return 0; addr_list=(struct in_addr **)he->h_addr_list; if (addr_list[0]==NULL) return 0; ip->sin_family=AF_INET; memcpy(&ip->sin_addr, addr_list[0], sizeof(ip->sin_addr)); return 1; } //Open a connection to a webserver and request an URL. Yes, this possibly is one of the worst ways to do this, //but RAM is at a premium here, and this works for most of the cases. int ICACHE_FLASH_ATTR openConn(const char *streamHost, const char *streamPath) { int n, i; while(1) { struct sockaddr_in remote_ip; bzero(&remote_ip, sizeof(struct sockaddr_in)); if (!getIpForHost(streamHost, &remote_ip)) { vTaskDelay(1000/portTICK_RATE_MS); continue; } int sock=socket(PF_INET, SOCK_STREAM, 0); if (sock==-1) { continue; } remote_ip.sin_port = htons(streamPort); printf("Connecting to server %s...\n", ipaddr_ntoa((const ip_addr_t*)&remote_ip.sin_addr.s_addr)); if (connect(sock, (struct sockaddr *)(&remote_ip), sizeof(struct sockaddr))!=00) { close(sock); printf("Conn err.\n"); vTaskDelay(1000/portTICK_RATE_MS); continue; } //Cobble together HTTP request write(sock, "GET ", 4); write(sock, streamPath, strlen(streamPath)); write(sock, " HTTP/1.0\r\nHost: ", 17); write(sock, streamHost, strlen(streamHost)); write(sock, "\r\n\r\n", 4); //We ignore the headers that the server sends back... it's pretty dirty in general to do that, //but it works here because the MP3 decoder skips it because it isn't valid MP3 data. return sock; } } //Reader task. This will try to read data from a TCP socket into the SPI fifo buffer. void ICACHE_FLASH_ATTR tskreader(void *pvParameters) { int madRunning=0; char wbuf[64]; int n, l, inBuf; int t; int fd; int c=0; while(1) { fd=openConn(streamHost, streamPath); printf("Reading into SPI RAM FIFO...\n"); do { n=read(fd, wbuf, sizeof(wbuf)); if (n>0) spiRamFifoWrite(wbuf, n); c+=n; if ((!madRunning) && (spiRamFifoFree()0); close(fd); printf("Connection closed.\n"); } } //Simple task to connect to an access point, initialize i2s and fire up the reader task. void ICACHE_FLASH_ATTR tskconnect(void *pvParameters) { //Wait a few secs for the stack to settle down vTaskDelay(3000/portTICK_RATE_MS); //Go to station mode wifi_station_disconnect(); if (wifi_get_opmode() != STATION_MODE) { wifi_set_opmode(STATION_MODE); } //Connect to the defined access point. struct station_config *config=malloc(sizeof(struct station_config)); memset(config, 0x00, sizeof(struct station_config)); sprintf(config->ssid, AP_NAME); sprintf(config->password, AP_PASS); wifi_station_set_config(config); wifi_station_connect(); free(config); //Fire up the reader task. The reader task will fire up the MP3 decoder as soon //as it has read enough MP3 data. if (xTaskCreate(tskreader, "tskreader", 230, NULL, PRIO_READER, NULL)!=pdPASS) printf("Error creating reader task!\n"); //We're done. Delete this task. vTaskDelete(NULL); } //We need this to tell the OS we're running at a higher clock frequency. extern void os_update_cpu_frequency(int mhz); void ICACHE_FLASH_ATTR user_init(void) { //Tell hardware to run at 160MHz instead of 80MHz //This actually is not needed in normal situations... the hardware is quick enough to do //MP3 decoding at 80MHz. It, however, seems to help with receiving data over long and/or unstable //links, so you may want to turn it on. Also, the delta-sigma code seems to need a bit more speed //than the other solutions to keep up with the output samples, so it's also enabled there. #if defined(DELTA_SIGMA_HACK) SET_PERI_REG_MASK(0x3ff00014, BIT(0)); os_update_cpu_frequency(160); #endif //Set the UART to 115200 baud UART_SetBaudrate(0, 115200); //Initialize the SPI RAM chip communications and see if it actually retains some bytes. If it //doesn't, warn user. if (!spiRamFifoInit()) { printf("\n\nSPI RAM chip fail!\n"); while(1); } printf("\n\nHardware initialized. Waiting for network.\n"); xTaskCreate(tskconnect, "tskconnect", 200, NULL, 3, NULL); } ...展开收缩

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