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From: "Rémi Denis-Courmont" <remi@remlab.net>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [PATCH 5/7] avcodec/vc2enc: Avoid relocations for short strings
Date: Tue, 28 May 2024 09:38:45 +0300
Message-ID: <C9025E11-3C06-4E77-88A0-14EF415ACB49@remlab.net> (raw)
In-Reply-To: <38e60694-4024-413a-81d8-dfd2c7a7c680@gmail.com>



Le 28 mai 2024 06:07:41 GMT+03:00, James Almer <jamrial@gmail.com> a écrit :
>On 5/27/2024 11:49 PM, Andreas Rheinhardt wrote:
>> These strings are so short that they can be put directly
>> into the containing structure, avoiding the pointer
>> and putting it into .rodata.
>> Also use chars for interlaced and level while at it, as
>> these are so small.
>> 
>> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
>> ---
>>   libavcodec/vc2enc.c | 5 +++--
>>   1 file changed, 3 insertions(+), 2 deletions(-)
>> 
>> diff --git a/libavcodec/vc2enc.c b/libavcodec/vc2enc.c
>> index 3285218724..8b9641916a 100644
>> --- a/libavcodec/vc2enc.c
>> +++ b/libavcodec/vc2enc.c
>> @@ -41,8 +41,9 @@
>>   typedef struct VC2BaseVideoFormat {
>>       enum AVPixelFormat pix_fmt;
>>       AVRational time_base;
>> -    int width, height, interlaced, level;
>> -    const char *name;
>> +    int width, height;
>> +    char interlaced, level;
>
>Use a fixed size type like uint8_t and not char.

The size of `char` is fixed to 8 bits *if* `uint8_t` exists though. It may be preferable to pick an explicitly signed or unsigned type still.
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  reply	other threads:[~2024-05-28  6:39 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-05-28  2:47 [FFmpeg-devel] [PATCH 1/7] avcodec/vc2enc: Avoid void* where possible Andreas Rheinhardt
2024-05-28  2:49 ` [FFmpeg-devel] [PATCH 2/7] avcodec/vc2enc: Constify slices->main context pointers Andreas Rheinhardt
2024-05-28  2:49 ` [FFmpeg-devel] [PATCH 3/7] avcodec/vc2enc: Remove superfluous error message Andreas Rheinhardt
2024-05-28  2:49 ` [FFmpeg-devel] [PATCH 4/7] avcodec/vc2enc: Fix slice length Andreas Rheinhardt
2024-05-28  2:49 ` [FFmpeg-devel] [PATCH 5/7] avcodec/vc2enc: Avoid relocations for short strings Andreas Rheinhardt
2024-05-28  3:07   ` James Almer
2024-05-28  6:38     ` Rémi Denis-Courmont [this message]
2024-05-28 14:25   ` Lynne via ffmpeg-devel
2024-05-28  2:49 ` [FFmpeg-devel] [PATCH 6/7] avcodec/vc2enc: Move transient PutBitContext from ctx to stack Andreas Rheinhardt
2024-05-28  2:49 ` [FFmpeg-devel] [PATCH 7/7] avcodec/vc2enc: Use already available AVPixFmtDescriptor Andreas Rheinhardt
2024-05-30 18:53 ` [FFmpeg-devel] [PATCH 1/7] avcodec/vc2enc: Avoid void* where possible Andreas Rheinhardt

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