[FFmpeg-devel] avfilter/f_metadata: allow direct flushing when printing to file

Useful for monitoring sparse data in realtime
---
 doc/filters.texi         | 3 +++
 libavfilter/f_metadata.c | 6 ++++++
 2 files changed, 9 insertions(+)

On 07-01-2020 05:44 pm, Gyan Doshi wrote:
> Useful for monitoring sparse data in realtime
> ---
>   doc/filters.texi         | 3 +++
>   libavfilter/f_metadata.c | 6 ++++++
>   2 files changed, 9 insertions(+)
>
> diff --git a/doc/filters.texi b/doc/filters.texi
> index fc2d198077..e682ba62bb 100644
> --- a/doc/filters.texi
> +++ b/doc/filters.texi
> @@ -22711,6 +22711,9 @@ plain filename any writable url can be specified. Filename ``-'' is a shorthand
>   for standard output. If @code{file} option is not set, output is written to the log
>   with AV_LOG_INFO loglevel.
>   
> +@item direct
> +Reduces buffering in print mode when output is written to a URL set using @var{file}.
> +
>   @end table
>   
>   @subsection Examples
> diff --git a/libavfilter/f_metadata.c b/libavfilter/f_metadata.c
> index 3bf4bb17f5..bf298e9d39 100644
> --- a/libavfilter/f_metadata.c
> +++ b/libavfilter/f_metadata.c
> @@ -88,6 +88,8 @@ typedef struct MetadataContext {
>       int (*compare)(struct MetadataContext *s,
>                      const char *value1, const char *value2);
>       void (*print)(AVFilterContext *ctx, const char *msg, ...) av_printf_format(2, 3);
> +
> +    int direct;    // reduces buffering when printing to user-supplied URL
>   } MetadataContext;
>   
>   #define OFFSET(x) offsetof(MetadataContext, x)
> @@ -111,6 +113,7 @@ static const AVOption filt_name##_options[] = { \
>       {   "ends_with",   NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_ENDS_WITH },   0, 0, FLAGS, "function" }, \
>       { "expr", "set expression for expr function", OFFSET(expr_str), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, FLAGS }, \
>       { "file", "set file where to print metadata information", OFFSET(file_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS }, \
> +    { "direct", "reduce buffering when printing to user-set file or pipe", OFFSET(direct), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS }, \
>       { NULL } \
>   }
>   
> @@ -274,6 +277,9 @@ static av_cold int init(AVFilterContext *ctx)
>                      s->file_str, buf);
>               return ret;
>           }
> +
> +        if (s->direct)
> +            s->avio_context->direct = AVIO_FLAG_DIRECT;
>       }
>   
>       return 0;

Plan to push tonight.

Gyan

On 10-01-2020 11:00 am, Gyan wrote:
>
>
> On 07-01-2020 05:44 pm, Gyan Doshi wrote:
>> Useful for monitoring sparse data in realtime
>> ---
>>   doc/filters.texi         | 3 +++
>>   libavfilter/f_metadata.c | 6 ++++++
>>   2 files changed, 9 insertions(+)
>>
>> diff --git a/doc/filters.texi b/doc/filters.texi
>> index fc2d198077..e682ba62bb 100644
>> --- a/doc/filters.texi
>> +++ b/doc/filters.texi
>> @@ -22711,6 +22711,9 @@ plain filename any writable url can be 
>> specified. Filename ``-'' is a shorthand
>>   for standard output. If @code{file} option is not set, output is 
>> written to the log
>>   with AV_LOG_INFO loglevel.
>>   +@item direct
>> +Reduces buffering in print mode when output is written to a URL set 
>> using @var{file}.
>> +
>>   @end table
>>     @subsection Examples
>> diff --git a/libavfilter/f_metadata.c b/libavfilter/f_metadata.c
>> index 3bf4bb17f5..bf298e9d39 100644
>> --- a/libavfilter/f_metadata.c
>> +++ b/libavfilter/f_metadata.c
>> @@ -88,6 +88,8 @@ typedef struct MetadataContext {
>>       int (*compare)(struct MetadataContext *s,
>>                      const char *value1, const char *value2);
>>       void (*print)(AVFilterContext *ctx, const char *msg, ...) 
>> av_printf_format(2, 3);
>> +
>> +    int direct;    // reduces buffering when printing to 
>> user-supplied URL
>>   } MetadataContext;
>>     #define OFFSET(x) offsetof(MetadataContext, x)
>> @@ -111,6 +113,7 @@ static const AVOption filt_name##_options[] = { \
>>       {   "ends_with",   NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 
>> METADATAF_ENDS_WITH },   0, 0, FLAGS, "function" }, \
>>       { "expr", "set expression for expr function", OFFSET(expr_str), 
>> AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, FLAGS }, \
>>       { "file", "set file where to print metadata information", 
>> OFFSET(file_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS }, \
>> +    { "direct", "reduce buffering when printing to user-set file or 
>> pipe", OFFSET(direct), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS }, \
>>       { NULL } \
>>   }
>>   @@ -274,6 +277,9 @@ static av_cold int init(AVFilterContext *ctx)
>>                      s->file_str, buf);
>>               return ret;
>>           }
>> +
>> +        if (s->direct)
>> +            s->avio_context->direct = AVIO_FLAG_DIRECT;
>>       }
>>         return 0;
>
> Plan to push tonight.

Pushed as 22a06a539ddba083b0a496a1871a90afb8d51627

Gyan