135 lines
3.8 KiB
C
135 lines
3.8 KiB
C
#include "audio_mp3.h"
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#include "main.h"
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#include "ff.h"
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#include "FreeRTOS.h"
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#include "queue.h"
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#include "elog.h"
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#include "heap.h"
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#include "bsp_aic3204.h"
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#include "dr_mp3.h"
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const static char *TAG = "player_mp3";
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static size_t mp3_read(void* pUserData, void* pBufferOut, size_t bytesToRead)
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{
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HAL_GPIO_TogglePin(LED_Y_GPIO_Port, LED_Y_Pin);
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UINT br;
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FRESULT f_result = f_read(pUserData, pBufferOut, bytesToRead, &br); //从文件中读取新的内容
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if (f_result != FR_OK) {
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elog_error(TAG, "file read error");
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return 0;
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}
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return br;
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}
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static drmp3_bool32 mp3_seek(void* pUserData, int offset, drmp3_seek_origin origin)
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{
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FIL *file = (FIL*)pUserData;
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uint32_t fptr = f_tell(file);
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uint32_t fsize = f_size(file);
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HAL_GPIO_TogglePin(LED_G_GPIO_Port, LED_G_Pin);
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switch (origin) {
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case drmp3_seek_origin_start:
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if (offset < fsize) { //未超过文件末尾
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f_lseek(file, offset);
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return DRMP3_TRUE;
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} else {
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elog_warn(TAG, "flac_seek: seeking beyond the end of the file");
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return DRMP3_FALSE;
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}
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case drmp3_seek_origin_current:
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if (fptr + offset < fsize) { //未超过文件末尾
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f_lseek(file, fptr + offset);
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return DRMP3_TRUE;
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} else {
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elog_warn(TAG, "flac_seek: seeking beyond the end of the file");
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return DRMP3_FALSE;
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}
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default:
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elog_warn(TAG, "flac_seek: unimplemented seek origin type: %d", origin);
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return DRMP3_FALSE;
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}
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}
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/**
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* @brief 播放MP3文件
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*
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* @param file_name 文件路径
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* @return esp_err_t 错误代码
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*
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* @note 本函数需要至少25600字节任务栈空间
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*/
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void music_mp3_play(const char *file_name)
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{
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FIL *file = malloc(sizeof(FIL));
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if (file == NULL) {
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elog_error(TAG, "music_mp3_play: error while allocating file object");
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return;
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}
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FRESULT f_result = f_open(file, file_name, FA_READ);
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if (f_result == FR_OK) {
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elog_info(TAG, "music_mp3_play: successfully opened %s for playing", file_name);
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} else {
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elog_error(TAG, "music_mp3_play: error while opening %s, error code=%d", file_name, f_result);
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free(file);
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return;
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}
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drmp3 *mp3 = malloc_dtcm(sizeof(drmp3)); //为MP3解码器分配内存
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if (mp3 == NULL) {
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elog_error(TAG, "error while creating mp3 decoder structure");
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goto exit;
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}
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drmp3_init(mp3, mp3_read, mp3_seek, file, NULL); //初始化MP3解码器 当不使用stdio API时pAllocationCallbacks无实际作用
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elog_info(TAG, "music_mp3_play: channels=%d, sampleRate=%d", mp3->channels, mp3->sampleRate);
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/* TODO: 判断mp3文件参数并返回错误 */
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bsp_aic3204_set_fs(&hi2c1, mp3->sampleRate); //设置采样率
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audio_hal_start(DRMP3_MAX_SAMPLES_PER_FRAME, sizeof(drmp3_int16)); //初始化SAI
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while(1) {
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drmp3_int16 *pcm_sample = malloc(DRMP3_MAX_SAMPLES_PER_FRAME * sizeof(drmp3_int16));
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/* 此处的framesToRead指的是PCM块中采样的数量(可以理解为时间层面的采样数) 不考虑声道数量与每个采样的字节数 */
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uint32_t sample_count = drmp3_read_pcm_frames_s16(mp3, DRMP3_MAX_PCM_FRAMES_PER_MP3_FRAME, pcm_sample); //解码新一帧MP3数据
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if (sample_count != 0) {
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audio_hal_write(pcm_sample, DRMP3_MAX_SAMPLES_PER_FRAME * sizeof(drmp3_int16)); ///将解码后的PCM数据写入SAI
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} else {
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free(pcm_sample);
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elog_info(TAG, "play done");
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break; //结束播放
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}
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if (HAL_GPIO_ReadPin(KEY2_GPIO_Port, KEY2_Pin) == GPIO_PIN_RESET) {
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vTaskDelay(pdMS_TO_TICKS(100));
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while (HAL_GPIO_ReadPin(KEY2_GPIO_Port, KEY2_Pin) == GPIO_PIN_RESET) {
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vTaskDelay(pdMS_TO_TICKS(1));
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}
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break;
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}
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}
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exit:
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audio_hal_stop(); //停止SAI播放
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if (file != NULL) {
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f_close(file); //关闭文件
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free(file);
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}
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if (mp3 != NULL) { //释放为解码器分配的内存
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free_dtcm(mp3);
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}
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}
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