[FFmpeg-devel] [PATCH] avfilter/drawtext: make reload value an interval

[Gyan Doshi]

On 2022-03-01 11:21 pm, Gyan Doshi wrote:
> Plan to push tomorrow.

Pushed as 4b72bca6ca3f982614ac2f94160c55abe3778555

Regards,
Gyan

>
> On 2022-02-28 12:58 pm, Gyan Doshi wrote:
>> Allows user to specify a frame interval at which textfile is reloaded.
>> ---
>>   doc/filters.texi          | 6 ++++--
>>   libavfilter/vf_drawtext.c | 6 +++---
>>   2 files changed, 7 insertions(+), 5 deletions(-)
>>
>> diff --git a/doc/filters.texi b/doc/filters.texi
>> index b3ae139613..1ecc03eeae 100644
>> --- a/doc/filters.texi
>> +++ b/doc/filters.texi
>> @@ -11271,8 +11271,10 @@ text data in detection bboxes of side data. 
>> So please do not use this parameter
>>   if you are not sure about the text source.
>>     @item reload
>> -If set to 1, the @var{textfile} will be reloaded before each frame.
>> -Be sure to update it atomically, or it may be read partially, or 
>> even fail.
>> +The @var{textfile} will be reloaded at specified frame interval.
>> +Be sure to update @var{textfile} atomically, or it may be read 
>> partially,
>> +or even fail.
>> +Range is 0 to INT_MAX. Default is 0.
>>     @item x
>>   @item y
>> diff --git a/libavfilter/vf_drawtext.c b/libavfilter/vf_drawtext.c
>> index 2a88692cbd..6ba3f6622a 100644
>> --- a/libavfilter/vf_drawtext.c
>> +++ b/libavfilter/vf_drawtext.c
>> @@ -198,7 +198,7 @@ typedef struct DrawTextContext {
>>       AVRational  tc_rate;            ///< frame rate for timecode
>>       AVTimecode  tc;                 ///< timecode context
>>       int tc24hmax;                   ///< 1 if timecode is wrapped 
>> to 24 hours, 0 otherwise
>> -    int reload;                     ///< reload text file for each 
>> frame
>> +    int reload;                     ///< reload text file at 
>> specified frame interval
>>       int start_number;               ///< starting frame number for 
>> n/frame_num var
>>       char *text_source_string;       ///< the string to specify text 
>> data source
>>       enum AVFrameSideDataType text_source;
>> @@ -245,7 +245,7 @@ static const AVOption drawtext_options[]= {
>>       {"timecode_rate",   "set rate (timecode only)", 
>> OFFSET(tc_rate),       AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0,  INT_MAX, 
>> FLAGS},
>>       {"r",               "set rate (timecode only)", 
>> OFFSET(tc_rate),       AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0,  INT_MAX, 
>> FLAGS},
>>       {"rate",            "set rate (timecode only)", 
>> OFFSET(tc_rate),       AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0,  INT_MAX, 
>> FLAGS},
>> -    {"reload",     "reload text file for each 
>> frame",                       OFFSET(reload), AV_OPT_TYPE_BOOL, 
>> {.i64=0}, 0, 1, FLAGS},
>> +    {"reload",     "reload text file at specified frame interval", 
>> OFFSET(reload),     AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS},
>>       { "alpha",       "apply alpha while rendering", 
>> OFFSET(a_expr),      AV_OPT_TYPE_STRING, { .str = "1" },          
>> .flags = FLAGS },
>>       {"fix_bounds", "check and fix text coords to avoid clipping", 
>> OFFSET(fix_bounds), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
>>       {"start_number", "start frame number for n/frame_num variable", 
>> OFFSET(start_number), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS},
>> @@ -1565,7 +1565,7 @@ static int filter_frame(AVFilterLink *inlink, 
>> AVFrame *frame)
>>           }
>>       }
>>   -    if (s->reload) {
>> +    if (s->reload && !(inlink->frame_count_out % s->reload)) {
>>           if ((ret = load_textfile(ctx)) < 0) {
>>               av_frame_free(&frame);
>>               return ret;
>
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