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/* ... */
#include "main.h"
Includes
#define AUDIO_BLOCK_SIZE 512
#define AUDIO_BLOCK_NBR 33
Private define
typedef struct
{
uint8_t buff[AUDIO_BLOCK_SIZE * AUDIO_BLOCK_NBR];
int32_t out_ptr;
uint32_t in_ptr;
...} Audio_BufferTypeDef;
Private typedef
static WAV_InfoTypedef wav_info;
static FIL wav_file;
static Audio_BufferTypeDef buffer_ctl;
static int16_t file_pos = 0;
Private variables
static AUDIO_ErrorTypeDef AUDIO_GetFileInfo(uint16_t file_idx,
WAV_InfoTypedef * info);
Private function prototypes
/* ... */
AUDIO_ErrorTypeDef AUDIO_Start(uint8_t idx)
{
uint32_t bytesread;
if ((FileList.ptr > idx) && (BSP_SD_IsDetected()))
{
f_close(&wav_file);
AUDIO_GetFileInfo(idx, &wav_info);
audio_state = AUDIO_STATE_CONFIG;
USBH_AUDIO_SetFrequency(&hUSBHost,
wav_info.SampleRate,
wav_info.NbrChannels, wav_info.BitPerSample);
if (f_read(&wav_file,
&buffer_ctl.buff[0],
AUDIO_BLOCK_SIZE * AUDIO_BLOCK_NBR, (void *)&bytesread) == FR_OK)
{
if (bytesread != 0)
{
return AUDIO_ERROR_NONE;
}if (bytesread != 0) { ... }
}if (f_read(&wav_file, &buffer_ctl.buff[0], AUDIO_BLOCK_SIZE * AUDIO_BLOCK_NBR, (void *)&bytesread) == FR_OK) { ... }
buffer_ctl.in_ptr = 0;
}if ((FileList.ptr > idx) && (BSP_SD_IsDetected())) { ... }
return AUDIO_ERROR_IO;
}{ ... }
/* ... */
AUDIO_ErrorTypeDef AUDIO_Process(void)
{
int32_t diff;
uint32_t bytesread, elapsed_time;
static uint32_t prev_elapsed_time = 0xFFFFFFFF;
uint8_t str[16];
switch (audio_state)
{
case AUDIO_STATE_PLAY:
if ((buffer_ctl.out_ptr = USBH_AUDIO_GetOutOffset(&hUSBHost)) < 0)
/* ... */
{
audio_state = AUDIO_STATE_NEXT;
...}
else if (buffer_ctl.out_ptr >= (AUDIO_BLOCK_SIZE * AUDIO_BLOCK_NBR))
/* ... */
{
USBH_AUDIO_ChangeOutBuffer(&hUSBHost, &buffer_ctl.buff[0]);
...}
else
{
diff = buffer_ctl.out_ptr - buffer_ctl.in_ptr;
if (diff < 0)
{
diff = AUDIO_BLOCK_SIZE * AUDIO_BLOCK_NBR + diff;
}if (diff < 0) { ... }
if (diff >= (AUDIO_BLOCK_SIZE * AUDIO_BLOCK_NBR / 2))
{
buffer_ctl.in_ptr += AUDIO_BLOCK_SIZE;
if (buffer_ctl.in_ptr >= (AUDIO_BLOCK_SIZE * AUDIO_BLOCK_NBR))
{
buffer_ctl.in_ptr = 0;
}if (buffer_ctl.in_ptr >= (AUDIO_BLOCK_SIZE * AUDIO_BLOCK_NBR)) { ... }
if (f_read(&wav_file,
&buffer_ctl.buff[buffer_ctl.in_ptr],
AUDIO_BLOCK_SIZE, (void *)&bytesread) != FR_OK)
{
return AUDIO_ERROR_IO;
}if (f_read(&wav_file, &buffer_ctl.buff[buffer_ctl.in_ptr], AUDIO_BLOCK_SIZE, (void *)&bytesread) != FR_OK) { ... }
}if (diff >= (AUDIO_BLOCK_SIZE * AUDIO_BLOCK_NBR / 2)) { ... }
}else { ... }
elapsed_time = wav_file.fptr / wav_info.ByteRate;
if (prev_elapsed_time != elapsed_time)
{
prev_elapsed_time = elapsed_time;
sprintf((char *)str, "[%02lu:%02lu]", elapsed_time / 60,
elapsed_time % 60);
BSP_LCD_SetTextColor(LCD_COLOR_CYAN);
BSP_LCD_DisplayStringAt(263, LINE(8), str, LEFT_MODE);
BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
}if (prev_elapsed_time != elapsed_time) { ... }
break;
case AUDIO_STATE_PLAY:
case AUDIO_STATE_NEXT:
if (++file_pos >= FileList.ptr)
{
file_pos = 0;
}if (++file_pos >= FileList.ptr) { ... }
USBH_AUDIO_Stop(&hUSBHost);
AUDIO_Start(file_pos);
break;
case AUDIO_STATE_NEXT:
case AUDIO_STATE_PREVIOUS:
if (--file_pos < 0)
{
file_pos = FileList.ptr - 1;
}if (--file_pos < 0) { ... }
USBH_AUDIO_Stop(&hUSBHost);
AUDIO_Start(file_pos);
break;
case AUDIO_STATE_PREVIOUS:
case AUDIO_STATE_PAUSE:
BSP_LCD_DisplayStringAt(250, LINE(14), (uint8_t *) " [PAUSE]", LEFT_MODE);
USBH_AUDIO_Suspend(&hUSBHost);
audio_state = AUDIO_STATE_WAIT;
break;
case AUDIO_STATE_PAUSE:
case AUDIO_STATE_RESUME:
BSP_LCD_DisplayStringAt(250, LINE(14), (uint8_t *) " [PLAY ]", LEFT_MODE);
USBH_AUDIO_Resume(&hUSBHost);
audio_state = AUDIO_STATE_PLAY;
break;
case AUDIO_STATE_RESUME:
case AUDIO_STATE_VOLUME_UP:
USBH_AUDIO_SetVolume(&hUSBHost, VOLUME_UP);
audio_state = AUDIO_STATE_PLAY;
break;
case AUDIO_STATE_VOLUME_UP:
case AUDIO_STATE_VOLUME_DOWN:
USBH_AUDIO_SetVolume(&hUSBHost, VOLUME_DOWN);
audio_state = AUDIO_STATE_PLAY;
break;
case AUDIO_STATE_VOLUME_DOWN:
case AUDIO_STATE_WAIT:
case AUDIO_STATE_CONFIG:
case AUDIO_STATE_IDLE:
case AUDIO_STATE_INIT:
default:
break;default
}switch (audio_state) { ... }
return AUDIO_ERROR_NONE;
}{ ... }
/* ... */
AUDIO_ErrorTypeDef AUDIO_Stop(void)
{
audio_state = AUDIO_STATE_IDLE;
USBH_AUDIO_Stop(&hUSBHost);
file_pos = 0;
f_close(&wav_file);
return AUDIO_ERROR_NONE;
}{ ... }
/* ... */
void AUDIO_PlaybackProbeKey(JOYState_TypeDef state)
{
if (state == JOY_UP)
{
if (audio_state == AUDIO_STATE_PLAY)
{
audio_state = AUDIO_STATE_VOLUME_UP;
}if (audio_state == AUDIO_STATE_PLAY) { ... }
}if (state == JOY_UP) { ... }
else if (state == JOY_DOWN)
{
if (audio_state == AUDIO_STATE_PLAY)
{
audio_state = AUDIO_STATE_VOLUME_DOWN;
}if (audio_state == AUDIO_STATE_PLAY) { ... }
}else if (state == JOY_DOWN) { ... }
else if (state == JOY_RIGHT)
{
audio_state = AUDIO_STATE_NEXT;
}else if (state == JOY_RIGHT) { ... }
else if (state == JOY_LEFT)
{
audio_state = AUDIO_STATE_PREVIOUS;
}else if (state == JOY_LEFT) { ... }
else if (state == JOY_SEL)
{
audio_state =
(audio_state ==
AUDIO_STATE_WAIT) ? AUDIO_STATE_RESUME : AUDIO_STATE_PAUSE;
}else if (state == JOY_SEL) { ... }
}{ ... }
/* ... */
static AUDIO_ErrorTypeDef AUDIO_GetFileInfo(uint16_t file_idx,
WAV_InfoTypedef * info)
{
uint8_t str[FILEMGR_FILE_NAME_SIZE + 20];
uint32_t bytesread;
uint32_t duration;
if (f_open
(&wav_file, (char *)FileList.file[file_idx].name,
FA_OPEN_EXISTING | FA_READ) == FR_OK)
{
if (f_read(&wav_file, info, sizeof(WAV_InfoTypedef), (void *)&bytesread) ==
FR_OK)
{
BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
sprintf((char *)str, "Playing file (%d/%d): %s",
file_idx + 1, FileList.ptr, (char *)FileList.file[file_idx].name);
BSP_LCD_ClearStringLine(4);
BSP_LCD_DisplayStringAtLine(4, str);
BSP_LCD_SetTextColor(LCD_COLOR_CYAN);
sprintf((char *)str, "Sample rate : %lu Hz", info->SampleRate);
BSP_LCD_ClearStringLine(6);
BSP_LCD_DisplayStringAtLine(6, str);
sprintf((char *)str, "Channels number : %d", info->NbrChannels);
BSP_LCD_ClearStringLine(7);
BSP_LCD_DisplayStringAtLine(7, str);
duration = info->FileSize / info->ByteRate;
sprintf((char *)str, "File Size : %lu MB [%02lu:%02lu]",
info->FileSize / 1024 / 1024, duration / 60, duration % 60);
BSP_LCD_ClearStringLine(8);
BSP_LCD_DisplayStringAtLine(8, str);
BSP_LCD_DisplayStringAt(263, LINE(8), (uint8_t *) "[00:00]", LEFT_MODE);
BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
return AUDIO_ERROR_NONE;
}if (f_read(&wav_file, info, sizeof(WAV_InfoTypedef), (void *)&bytesread) == FR_OK) { ... }
f_close(&wav_file);
}if (f_open (&wav_file, (char *)FileList.file[file_idx].name, FA_OPEN_EXISTING | FA_READ) == FR_OK) { ... }
return AUDIO_ERROR_IO;
}{ ... }
/* ... */
void USBH_AUDIO_FrequencySet(USBH_HandleTypeDef * phost)
{
if (audio_state == AUDIO_STATE_CONFIG)
{
USBH_AUDIO_Play(&hUSBHost, &buffer_ctl.buff[0], wav_info.FileSize);
BSP_LCD_DisplayStringAt(250, LINE(14), (uint8_t *) " [PLAY ]", LEFT_MODE);
audio_state = AUDIO_STATE_PLAY;
}if (audio_state == AUDIO_STATE_CONFIG) { ... }
}{ ... }