266 lines
7.5 KiB
C
266 lines
7.5 KiB
C
/*
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******************************************************************************
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* @file recorder.c
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* @author fire
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* @version V1.0
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* @date 2015-xx-xx
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* @brief WM8978放音功能测试+mp3解码
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******************************************************************************
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* @attention
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*
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* 实验平台:野火 STM32 H750 开发板
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* 论坛 :http://www.chuxue123.com
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* 淘宝 :http://firestm32.taobao.com
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*
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******************************************************************************
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*/
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#include <stdio.h>
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#include <string.h>
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#include "./usart/bsp_debug_usart.h"
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#include "./wm8978/bsp_wm8978.h"
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#include "ff.h"
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#include "./mp3Player/mp3Player.h"
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#include "mp3dec.h"
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#include "./sai/bsp_sai.h"
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/* 推荐使用以下格式mp3文件：
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* 采样率：44100Hz
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* 声 道：2
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* 比特率：320kbps
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*/
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/* 处理立体声音频数据时，输出缓冲区需要的最大大小为2304*16/8字节(16为PCM数据为16位)，
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* 这里我们定义MP3BUFFER_SIZE为2304，实际输出缓冲区为MP3BUFFER_SIZE*2个字节
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*/
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#define MP3BUFFER_SIZE 2304
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#define INPUTBUF_SIZE 3000
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static HMP3Decoder Mp3Decoder; /* mp3解码器指针 */
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static MP3FrameInfo Mp3FrameInfo; /* mP3帧信息 */
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static MP3_TYPE mp3player; /* mp3播放设备 */
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volatile uint8_t Isread=0; /* DMA传输完成标志 */
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static uint8_t bufflag=0; /* 数据缓存区选择标志 */
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uint32_t led_delay=0;
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uint8_t inputbuf[INPUTBUF_SIZE]={0}; /* 解码输入缓冲区，1940字节为最大MP3帧大小 */
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__attribute__((at(0x30000000))) short outbuffer[2][MP3BUFFER_SIZE]; /* 解码输出缓冲区，也是I2S输入数据，实际占用字节数：RECBUFFER_SIZE*2 */
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FIL file; /* file objects */
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FRESULT result;
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UINT bw; /* File R/W count */
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/**
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* @brief MP3格式音频播放主程序
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* @param 无
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* @retval 无
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*/
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int times = 0;
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void mp3PlayerDemo(const char *mp3file)
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{
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uint8_t *read_ptr=inputbuf;
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uint32_t frames=0;
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int err=0, i=0, outputSamps=0;
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int read_offset = 0; /* 读偏移指针 */
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int bytes_left = 0; /* 剩余字节数 */
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mp3player.ucFreq = SAI_AUDIOFREQ_DEFAULT;
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mp3player.ucStatus = STA_IDLE;
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mp3player.ucVolume = 40;
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result=f_open(&file,mp3file,FA_READ);
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if(result!=FR_OK)
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{
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printf("Open mp3file :%s fail!!!->%d\r\n",mp3file,result);
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result = f_close (&file);
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return; /* 停止播放 */
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}
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printf("当前播放文件 -> %s\n",mp3file);
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//初始化MP3解码器
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Mp3Decoder = MP3InitDecoder();
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if(Mp3Decoder==0)
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{
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printf("初始化helix解码库设备\n");
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return; /* 停止播放 */
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}
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printf("初始化中...\n");
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Delay_ms(10); /* 延迟一段时间，等待I2S中断结束 */
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wm8978_Reset(); /* 复位WM8978到复位状态 */
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/* 配置WM8978芯片，输入为DAC，输出为耳机 */
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wm8978_CfgAudioPath(DAC_ON, EAR_LEFT_ON | EAR_RIGHT_ON);
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/* 调节音量，左右相同音量 */
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wm8978_SetOUT1Volume(mp3player.ucVolume);
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/* 配置WM8978音频接口为飞利浦标准I2S接口，16bit */
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wm8978_CfgAudioIF(SAI_I2S_STANDARD, 16);
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/* 初始化并配置I2S */
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SAI_Play_Stop();
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SAI_GPIO_Config();
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// SAIxA_Tx_Config(SAI_I2S_STANDARD,SAI_PROTOCOL_DATASIZE_16BIT,mp3player.ucFreq);
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// SAIA_TX_DMA_Init();
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bufflag=0;
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Isread=0;
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mp3player.ucStatus = STA_PLAYING; /* 放音状态 */
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result=f_read(&file,inputbuf,INPUTBUF_SIZE,&bw);
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if(result!=FR_OK)
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{
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printf("读取%s失败 -> %d\r\n",mp3file,result);
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MP3FreeDecoder(Mp3Decoder);
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return;
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}
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read_ptr=inputbuf;
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bytes_left=bw;
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/* 进入主程序循环体 */
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while(mp3player.ucStatus == STA_PLAYING)
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{
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read_offset = MP3FindSyncWord(read_ptr, bytes_left); //寻找帧同步，返回第一个同步字的位置
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if(read_offset < 0) //没有找到同步字
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{
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result=f_read(&file,inputbuf,INPUTBUF_SIZE,&bw);
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if(result!=FR_OK)
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{
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printf("读取%s失败 -> %d\r\n",mp3file,result);
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break;
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}
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read_ptr=inputbuf;
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bytes_left=bw;
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continue; //跳出循环2，回到循环1
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}
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read_ptr += read_offset; //偏移至同步字的位置
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bytes_left -= read_offset; //同步字之后的数据大小
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if(bytes_left < 1024) //补充数据
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{
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/* 注意这个地方因为采用的是DMA读取，所以一定要4字节对齐 */
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i=(uint32_t)(bytes_left)&3; //判断多余的字节
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if(i) i=4-i; //需要补充的字节
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memcpy(inputbuf+i, read_ptr, bytes_left); //从对齐位置开始复制
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read_ptr = inputbuf+i; //指向数据对齐位置
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result = f_read(&file, inputbuf+bytes_left+i, INPUTBUF_SIZE-bytes_left-i, &bw);//补充数据
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if(result!=FR_OK)
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{
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printf("读取%s失败 -> %d\r\n",mp3file,result);
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break;
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}
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bytes_left += bw; //有效数据流大小
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}
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err = MP3Decode(Mp3Decoder, &read_ptr, &bytes_left, outbuffer[bufflag], 0); //bufflag开始解码 参数：mp3解码结构体、输入流指针、输入流大小、输出流指针、数据格式
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frames++;
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if (err != ERR_MP3_NONE) //错误处理
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{
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switch (err)
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{
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case ERR_MP3_INDATA_UNDERFLOW:
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printf("ERR_MP3_INDATA_UNDERFLOW\r\n");
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result = f_read(&file, inputbuf, INPUTBUF_SIZE, &bw);
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read_ptr = inputbuf;
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bytes_left = bw;
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break;
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case ERR_MP3_MAINDATA_UNDERFLOW:
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/* do nothing - next call to decode will provide more mainData */
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printf("ERR_MP3_MAINDATA_UNDERFLOW\r\n");
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break;
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default:
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printf("UNKNOWN ERROR:%d\r\n", err);
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// 跳过此帧
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if (bytes_left > 0)
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{
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bytes_left --;
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read_ptr ++;
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}
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break;
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}
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Isread=1;
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}
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else //解码无错误，准备把数据输出到PCM
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{
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MP3GetLastFrameInfo(Mp3Decoder, &Mp3FrameInfo); //获取解码信息
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/* 输出到DAC */
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outputSamps = Mp3FrameInfo.outputSamps; //PCM数据个数
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if (outputSamps > 0)
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{
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if (Mp3FrameInfo.nChans == 1) //单声道
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{
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//单声道数据需要复制一份到另一个声道
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for (i = outputSamps - 1; i >= 0; i--)
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{
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outbuffer[bufflag][i * 2] = outbuffer[bufflag][i];
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outbuffer[bufflag][i * 2 + 1] = outbuffer[bufflag][i];
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}
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outputSamps *= 2;
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}//if (Mp3FrameInfo.nChans == 1) //单声道
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}//if (outputSamps > 0)
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/* 根据解码信息设置采样率 */
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if (Mp3FrameInfo.samprate != mp3player.ucFreq) //采样率
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{
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mp3player.ucFreq = Mp3FrameInfo.samprate;
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printf(" \r\n Bitrate %dKbps", Mp3FrameInfo.bitrate/1000);
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printf(" \r\n Samprate %dHz", mp3player.ucFreq);
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printf(" \r\n BitsPerSample %db", Mp3FrameInfo.bitsPerSample);
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printf(" \r\n nChans %d", Mp3FrameInfo.nChans);
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printf(" \r\n Layer %d", Mp3FrameInfo.layer);
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printf(" \r\n Version %d", Mp3FrameInfo.version);
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printf(" \r\n OutputSamps %d", Mp3FrameInfo.outputSamps);
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printf("\r\n");
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if(mp3player.ucFreq >= SAI_AUDIOFREQ_DEFAULT) //I2S_AudioFreq_Default = 2，正常的帧，每次都要改速率
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{
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SAIxA_Tx_Config(SAI_I2S_STANDARD,SAI_PROTOCOL_DATASIZE_16BIT,mp3player.ucFreq); //根据采样率修改iis速率
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SAIA_TX_DMA_Init((uint32_t)(&outbuffer[0]),(uint32_t)&outbuffer[1],outputSamps);
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}
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SAI_Play_Start();
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}
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}//else 解码正常
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if(file.fptr==file.fsize) //mp3文件读取完成，退出
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{
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printf("END\r\n");
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break;
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}
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while(Isread==0)
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{
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led_delay++;
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if(led_delay==0xffffff)
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{
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led_delay=0;
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// LED4_TOGGLE;
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}
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//Input_scan(); //等待DMA传输完成，此间可以运行按键扫描及处理事件
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}
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Isread=0;
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}
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SAI_Play_Stop();
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mp3player.ucStatus=STA_IDLE;
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MP3FreeDecoder(Mp3Decoder);
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f_close(&file);
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}
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/* DMA发送完成中断回调函数 */
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/* 缓冲区内容已经播放完成，需要切换缓冲区，进行新缓冲区内容播放
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同时读取WAV文件数据填充到已播缓冲区 */
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void MusicPlayer_SAI_DMA_TX_Callback(void)
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{
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if(DMA_Instance->CR&(1<<19)) //当前使用Memory1数据
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{
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bufflag=0; //可以将数据读取到缓冲区0
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}
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else //当前使用Memory0数据
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{
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bufflag=1; //可以将数据读取到缓冲区1
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}
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Isread=1; // DMA传输完成标志
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}
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/***************************** (END OF FILE) *********************************/
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