These software package had verified on STM32F4 discovery platform for reading mp3 file from USB mass storage and decoding/playing it.

STM32F4_USB_MSC_MP3_Ver_II\Conf\ffconf.h
..........................\....\usbd_conf.h
..........................\....\usbd_desc.h
..........................\....\usbh_conf.h
..........................\....\usbh_usr.h
..........................\....\usb_conf.h
..........................\..re\cmsis\arm_common_tables.h
..........................\....\.....\arm_math.h
..........................\....\.....\core_cm0.h
..........................\....\.....\core_cm3.h
..........................\....\.....\core_cm4.h
..........................\....\.....\core_cm4_simd.h
..........................\....\.....\core_cmFunc.h
..........................\....\.....\core_cmInstr.h
..........................\....\stm32\stm32f4xx.h
..........................\....\.....\system_stm32f4xx.h
..........................\Debug\Exe\STM32F4_USB_MSC.out
..........................\.....\...\STM32F4_USB_MSC.sim
..........................\.....\Obj\Audio.o
..........................\.....\...\bitstream.o
..........................\.....\...\buffers.o
..........................\.....\...\ccsbcs.o
..........................\.....\...\dct32.o
..........................\.....\...\dequant.o
..........................\.....\...\diskio.o
..........................\.....\...\dqchan.o
..........................\.....\...\fattime.o
..........................\.....\...\ff.o
..........................\.....\...\huffman.o
..........................\.....\...\hufftabs.o
..........................\.....\...\imdct.o
..........................\.....\...\main.o
..........................\.....\...\misc.o
..........................\.....\...\mp3dec.o
..........................\.....\...\mp3tabs.o
..........................\.....\...\polyphase.o
..........................\.....\...\scalfact.o
..........................\.....\...\startup_stm32f4xx.o
..........................\.....\...\stm32f4xx_adc.o
..........................\.....\...\stm32f4xx_can.o
..........................\.....\...\stm32f4xx_crc.o
..........................\.....\...\stm32f4xx_cryp.o
..........................\.....\...\stm32f4xx_cryp_aes.o
..........................\.....\...\stm32f4xx_cryp_des.o
..........................\.....\...\stm32f4xx_cryp_tdes.o
..........................\.....\...\stm32f4xx_dac.o
..........................\.....\...\stm32f4xx_dbgmcu.o
..........................\.....\...\stm32f4xx_dcmi.o
..........................\.....\...\stm32f4xx_dma.o
..........................\.....\...\stm32f4xx_exti.o
..........................\.....\...\stm32f4xx_flash.o
..........................\.....\...\stm32f4xx_fsmc.o
..........................\.....\...\stm32f4xx_gpio.o
..........................\.....\...\stm32f4xx_hash.o
..........................\.....\...\stm32f4xx_hash_md5.o
..........................\.....\...\stm32f4xx_hash_sha1.o
..........................\.....\...\stm32f4xx_i2c.o
..........................\.....\...\stm32f4xx_it.o
..........................\.....\...\stm32f4xx_iwdg.o
..........................\.....\...\stm32f4xx_pwr.o
..........................\.....\...\stm32f4xx_rcc.o
..........................\.....\...\stm32f4xx_rng.o
..........................\.....\...\stm32f4xx_rtc.o
..........................\.....\...\stm32f4xx_sdio.o
..........................\.....\...\stm32f4xx_spi.o
..........................\.....\...\stm32f4xx_syscfg.o
..........................\.....\...\stm32f4xx_tim.o
..........................\.....\...\stm32f4xx_usart.o
..........................\.....\...\stm32f4xx_wwdg.o
..........................\.....\...\STM32F4_USB_MSC.pbd
..........................\.....\...\stproc.o
..........................\.....\...\subband.o
..........................\.....\...\system_stm32f4xx.o
..........................\.....\...\trigtabs_fixpt.o
..........................\.....\...\usbh_core.o
..........................\.....\...\usbh_hcs.o
..........................\.....\...\usbh_ioreq.o
..........................\.....\...\usbh_msc_bot.o
..........................\.....\...\usbh_msc_core.o
..........................\.....\...\usbh_msc_fatfs.o
..........

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