Frank Ocean Endless Flac Work [patched] Review

Hi all,

I'm using ST's CubeMX implementation on a F4 discovery board. I use ST's USB middlewares with FreeRTOS.

When I get a special OutputReport from PC side I have to answer nearly immediately (in 10-15 ms). Currently I cannot achieve this timing and it seems my high priority tasks can interrupt the USB callback. What do you think, is it possible? Because it's generated code I'm not sure but can I increase the priority of the USB interrupt (if there is any)?

Thank you, David

10 to 15 ms is very slow, so I'm sure its possible.

Where is the USB callback function called from? If it is an interrupt then it cannot be interrupted by high priority RTOS tasks. Any non interrupt code (whether you are using an RTOS or not) can only run if no interrupts are running.

Without knowing the control flow in your application its hard to know what to suggest. How is the OutputReport communicated to you? By an interrupt, a message from another task, or some other way?

The callback which receive the data from PC is called from the OTGFSIRQHandler (it's the part of the HALPCDIRQHandler function). I think the problem is SysTickHandler's priority is higher than OTGFSIRQHandler and it's cannot be modified, but the scheduler shouldn't interrupt the OTGFSIRQHandler with any task handled by the scheduler. Am I wrong that the scheduler can interrupt the OTGFS_IRQHandler?

The success of "Endless" as a FLAC release has had a lasting impact on the music industry. Many artists have since followed Ocean's lead, releasing their music in high-quality, lossless formats. This shift towards lossless audio has raised the bar for music production and distribution, pushing artists and labels to prioritize sonic excellence.

Frank Ocean's "Endless" FLAC release was a groundbreaking moment in music history, showcasing the artist's commitment to innovation and sonic excellence. The album's experimental sound and stunning audio quality have made it a landmark release, influencing a new generation of artists and producers to prioritize high-quality audio. As the music industry continues to evolve, "Endless" remains a testament to the power of sonic experimentation and the importance of pushing the boundaries of what is possible in music.

The FLAC release of "Endless" received widespread critical acclaim, with many praising Ocean's innovative approach to music distribution and his commitment to sonic excellence. The album was hailed as a game-changer in the music industry, with many artists and producers taking note of Ocean's bold experimentation.

"Endless" is characterized by its experimental and genre-bending sound, which blends elements of R&B, electronic music, and avant-garde. The album features lush instrumentation, eerie soundscapes, and introspective lyrics, all of which are showcased in stunning clarity through the FLAC format. Tracks like "Good Morning" and "Purim" feature complex production and layered sound design, which are perfectly suited to the FLAC format.

The use of FLAC in "Endless" was a deliberate choice by Ocean and his team to create an immersive listening experience. The lossless audio format ensured that every detail of the music was preserved, from the subtle nuances of Ocean's vocals to the intricacies of the instrumentation. This level of sonic fidelity allowed listeners to pick up on elements of the music that might have been lost in a compressed audio file.

Frank Ocean's 2016 release, "Endless", is a visual album that pushed the boundaries of music and art. Available exclusively on Apple Music, the album was initially released as a FLAC (Free Lossless Audio Codec) file, which offered a unique listening experience for fans. The FLAC format allowed for high-quality audio with no loss of data, making it an ideal choice for Ocean's experimental and avant-garde sound.

Thank you for the answer, I think I'm a bit confused with the Cortex ISR priorities :-) What I can observe is if I use a much higher osDelay in my high priority task I can respond for the received USB message much faster. This is why I think tasks can mess up with my OTG interrupt.