[FFmpeg-devel] [PATCH] avcodec/dsddec: add slice threading support

[David Bryant]

On 7/30/19 1:43 AM, Carl Eugen Hoyos wrote:
> Am So., 28. Juli 2019 um 23:35 Uhr schrieb Paul B Mahol <onemda at gmail.com>:
>> Hi,
>>
>> patch attached.
> As just posted on irc:
> On an 8-core Intel cpu, this makes decoding slower by a factor two,
> heating the cpu
> ten times as much, on a multi-core powerpc, decoding is nearly two
> times slower, and
> heats nearly eight times as much.

I can verify the greatly increased CPU load on a dual core system also. I also verified that the outputted audio data is correct
(identical to unmodified code) and that there are no more samples being processed, indicating it's probably just threading overhead.

The dsd2pcm conversion is pretty optimized and I suspect that's just way too fast to be worth multi-threading.

As I suggested earlier, it's the DST decompression that is worth looking into for threading.

-David


>
> Carl Eugen
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