Andreas Rheinhardt:
> Anton Khirnov:
>> +/**
>> + * Must be set as default_val for AV_OPT_TYPE_FLAG_ARRAY options.
>> + */
>> +typedef struct AVOptionArrayDef {
>> + /**
>> + * Must be set to sizeof(AVOptionArrayDef), in order to allow extending
>> this
>> + * struct without breaking ABI.
>> + */
>> + size_t sizeof_self;
>
> I do not really get the point of this field: It is not sufficient for
> detecting whether a user used a version that set a certain field due to
> trailing padding (i.e. an additional field need not increase
> sizeof(AVOptionArrayDef); this is actually relevant for this structure,
> because on x64 at least a new int/unsigned would fit into trailing padding).
> Luckily we already have a way to know the user's lavu version, as it is
> contained in the AVClass.
>
I do not really see a reply to the above comment.
>> +
>> + /**
>> + * Native access only.
>> + *
>> + * Default value of the option, as would be serialized by av_opt_get()
>> (i.e.
>> + * using the value of sep as the separator).
>> + */
>> + const char *def;
>> +
>> + /**
>> + * Minimum number of elements in the array. When this field is
>> non-zero, def
>> + * must be non-NULL and contain at least this number of elements.
>> + */
>> + unsigned size_min;
>> + /**
>> + * Maximum number of elements in the array, 0 when unlimited.
>> + */
>> + unsigned size_max;
>> +
>> + /**
>> + * Separator between array elements in string representations of this
>> + * option, used by av_opt_set() and av_opt_get(). It must be a printable
>> + * ASCII character, excluding alphanumeric and the backslash. A comma is
>> + * used when sep=0.
>> + *
>> + * The separator and the backslash must be backslash-escaped in order to
>> + * appear in string representations of the option value.
>> + */
>> + uint8_t sep;
>
> If this is a printable ASCII character, then it should be a char.
>
>> +} AVOptionArrayDef;
>> +
>> /**
>> * AVOption
>> */
>> @@ -320,8 +371,7 @@ typedef struct AVOption {
>> enum AVOptionType type;
>>
>> /**
>> - * Native access only.
>> - *
>> + * Native access only, except when documented otherwise.
>> * the default value for scalar options
>> */
>> union {
>> @@ -330,6 +380,14 @@ typedef struct AVOption {
>> const char *str;
>> /* TODO those are unused now */
>> AVRational q;
>> +
>> + /**
>> + * Used for AV_OPT_TYPE_FLAG_ARRAY options. May be NULL.
>> + *
>> + * Foreign access to some members allowed, as noted in
>> AVOptionArrayDef
>> + * documentation.
>> + */
>> + const AVOptionArrayDef *arr;
>> } default_val;
>> double min; ///< minimum valid value for the option
>> double max; ///< maximum valid value for the option
>
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