In the doucumentation "Buffer" appars in different contexts,
- record buffer
- (stream) decode buffer
- double buffer
- callback buffer
- stream buffer
- "all streams are pre-buffered"
- "reflush of a buffer"
- to prebuffer
Can anyone help me understanding meanings of the buffer concept in eight cirumstances listed above?
With best regards
- zorank asked 10 years ago
1. record buffer
2. (stream) decode buffer
3. double buffer
4. callback buffer
5. stream buffer
6. "all streams are pre-buffered"
7. "reflush of a buffer"
8. to prebuffer
i presume you understand terms such as asynchronous operations, streaming etc…?
- a chunk of memory where captured data is written
- a chunk of memory where parts (also buffers) of stream are decoded into, ie: if a stream is mp3, it can be decoded (into pcm for example) chunk by chunk and the fed to output device
- two chunks of memory, which are being swapped, while one is being read, other can be written, this is basically an optimization
- this one can be pretty much anything
- a chunk of memory, where the data from file is being read into, presumably and async reading operation, ie: you read 256kb of data, play for X seconds and when it is nearing the end, read another 256kb (can use double buffer here)
- if you know that some data is going to be used, and you want this data to be read in a an async way, you can prebuffer (pre-read) the first part of it. this way, when you say play, it starts playing immediately
- when wrong data is being streamed, you have to flush the buffers, so that new data can start with a clean slate
- can apply to any kind of read operation, pretty much same as point 6
pretty much all this is handled by the fmod itself, you do have some control on how large the streaming buffers are for example. just give fmod a pre-allocated chunk of memory (a buffer ;)) and it will do its magic, hopefully 8)
Oh boy, many thanks for clarifications. Really appreciate it!
I start to be nervous since it seems that only "old foxes" (experienced developers) venture into this forum. Please bear with me… I found the FMOD documentation very hard to use (probably taylored to experienced developers) so in pure desperation I turned to this forum.
Many tanks again. I will study your reply carefully. By the way, could I kindly ask you too look into following post:
it is about locking the buffer by sound::lock. Hope you could scratch some time to help me there.
With best regards
Thanks for reply! I realize from your reply that I was not clear about what I am after. In FMOD there are various scenarios how buffers are used. I was intersted in making a catalogue of these scenarios. In documentation I found eight ways of talking about buffer. I have changed title of the topic to emphasize what I am after.
In brief, I am really interested in understanding how buffer is used in various scenarios in FMOD architecture.
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