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lavu/opt: extend AVOptionRange by extra values
AVOptionRange is not flexible enough to store AV_OPT_TYPE_IMAGE_SIZE ranges. Current implementation can only store pixel count. This patch aims to keep backward compatibility and extend AVOptionRange with possibility to store width/height ranges. Signed-off-by: Lukasz Marek <lukasz.m.luki@gmail.com>
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@ -15,6 +15,10 @@ libavutil: 2012-10-22
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API changes, most recent first:
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2014-04-xx - xxxxxxx - lavu 52.72.100 - opt.h
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Add AV_OPT_MULTI_COMPONENT_RANGE define to allow return
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multi-component option ranges.
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2014-03-xx - xxxxxxx - lavu 52.70.100 - mem.h
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Add av_dynarray_add_nofree() function.
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@ -1514,6 +1514,7 @@ void *av_opt_ptr(const AVClass *class, void *obj, const char *name)
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int av_opt_query_ranges(AVOptionRanges **ranges_arg, void *obj, const char *key, int flags)
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{
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int ret;
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const AVClass *c = *(AVClass**)obj;
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int (*callback)(AVOptionRanges **, void *obj, const char *key, int flags) = NULL;
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@ -1523,7 +1524,13 @@ int av_opt_query_ranges(AVOptionRanges **ranges_arg, void *obj, const char *key,
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if (!callback)
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callback = av_opt_query_ranges_default;
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return callback(ranges_arg, obj, key, flags);
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ret = callback(ranges_arg, obj, key, flags);
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if (ret >= 0) {
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if (!(flags & AV_OPT_MULTI_COMPONENT_RANGE))
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ret = 1;
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(*ranges_arg)->nb_components = ret;
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}
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return ret;
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}
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int av_opt_query_ranges_default(AVOptionRanges **ranges_arg, void *obj, const char *key, int flags)
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@ -1544,6 +1551,7 @@ int av_opt_query_ranges_default(AVOptionRanges **ranges_arg, void *obj, const ch
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ranges->range = range_array;
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ranges->range[0] = range;
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ranges->nb_ranges = 1;
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ranges->nb_components = 1;
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range->is_range = 1;
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range->value_min = field->min;
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range->value_max = field->max;
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@ -1587,7 +1595,7 @@ int av_opt_query_ranges_default(AVOptionRanges **ranges_arg, void *obj, const ch
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}
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*ranges_arg = ranges;
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return 0;
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return 1;
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fail:
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av_free(ranges);
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av_free(range);
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@ -1600,7 +1608,7 @@ void av_opt_freep_ranges(AVOptionRanges **rangesp)
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int i;
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AVOptionRanges *ranges = *rangesp;
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for (i = 0; i < ranges->nb_ranges; i++) {
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for (i = 0; i < ranges->nb_ranges * ranges->nb_components; i++) {
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AVOptionRange *range = ranges->range[i];
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av_freep(&range->str);
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av_freep(&ranges->range[i]);
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@ -313,17 +313,67 @@ typedef struct AVOption {
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*/
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typedef struct AVOptionRange {
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const char *str;
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double value_min, value_max; ///< For string ranges this represents the min/max length, for dimensions this represents the min/max pixel count
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double component_min, component_max; ///< For string this represents the unicode range for chars, 0-127 limits to ASCII
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int is_range; ///< if set to 1 the struct encodes a range, if set to 0 a single value
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/**
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* Value range.
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* For string ranges this represents the min/max length.
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* For dimensions this represents the min/max pixel count or width/height in multi-component case.
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*/
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double value_min, value_max;
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/**
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* Value's component range.
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* For string this represents the unicode range for chars, 0-127 limits to ASCII.
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*/
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double component_min, component_max;
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/**
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* Range flag.
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* If set to 1 the struct encodes a range, if set to 0 a single value.
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*/
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int is_range;
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} AVOptionRange;
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/**
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* List of AVOptionRange structs
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* List of AVOptionRange structs.
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*/
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typedef struct AVOptionRanges {
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/**
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* Array of option ranges.
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*
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* Most of option types use just one component.
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* Following describes multi-component option types:
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*
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* AV_OPT_TYPE_IMAGE_SIZE:
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* component index 0: range of pixel count (width * height).
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* component index 1: range of width.
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* component index 2: range of height.
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*
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* @note To obtain multi-component version of this structure, user must
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* provide AV_OPT_MULTI_COMPONENT_RANGE to av_opt_query_ranges or
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* av_opt_query_ranges_default function.
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*
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* Multi-component range can be read as in following example:
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*
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* @code
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* int range_index, component_index;
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* AVOptionRanges *ranges;
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* AVOptionRange *range[3]; //may require more than 3 in the future.
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* av_opt_query_ranges(&ranges, obj, key, AV_OPT_MULTI_COMPONENT_RANGE);
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* for (range_index = 0; range_index < ranges->nb_ranges; range_index++) {
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* for (component_index = 0; component_index < ranges->nb_components; component_index++)
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* range[component_index] = ranges->range[ranges->nb_ranges * component_index + range_index];
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* //do something with range here.
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* }
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* av_opt_freep_ranges(&ranges);
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* @endcode
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*/
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AVOptionRange **range;
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/**
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* Number of ranges per component.
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*/
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int nb_ranges;
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/**
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* Number of componentes.
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*/
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int nb_components;
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} AVOptionRanges;
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@ -558,6 +608,13 @@ int av_opt_eval_q (void *obj, const AVOption *o, const char *val, AVRational
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*/
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#define AV_OPT_SEARCH_FAKE_OBJ 0x0002
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/**
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* Allows av_opt_query_ranges and av_opt_query_ranges_default to return more than
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* one component for certain option types.
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* @see AVOptionRanges for details.
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*/
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#define AV_OPT_MULTI_COMPONENT_RANGE 0x1000
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/**
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* Look for an option in an object. Consider only options which
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* have all the specified flags set.
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@ -739,10 +796,11 @@ void av_opt_freep_ranges(AVOptionRanges **ranges);
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*
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* @param flags is a bitmask of flags, undefined flags should not be set and should be ignored
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* AV_OPT_SEARCH_FAKE_OBJ indicates that the obj is a double pointer to a AVClass instead of a full instance
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* AV_OPT_MULTI_COMPONENT_RANGE indicates that function may return more than one component, @see AVOptionRanges
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*
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* The result must be freed with av_opt_freep_ranges.
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*
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* @return >= 0 on success, a negative errro code otherwise
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* @return number of compontents returned on success, a negative errro code otherwise
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*/
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int av_opt_query_ranges(AVOptionRanges **, void *obj, const char *key, int flags);
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@ -754,10 +812,11 @@ int av_opt_query_ranges(AVOptionRanges **, void *obj, const char *key, int flags
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*
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* @param flags is a bitmask of flags, undefined flags should not be set and should be ignored
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* AV_OPT_SEARCH_FAKE_OBJ indicates that the obj is a double pointer to a AVClass instead of a full instance
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* AV_OPT_MULTI_COMPONENT_RANGE indicates that function may return more than one component, @see AVOptionRanges
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*
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* The result must be freed with av_opt_free_ranges.
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*
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* @return >= 0 on success, a negative errro code otherwise
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* @return number of compontents returned on success, a negative errro code otherwise
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*/
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int av_opt_query_ranges_default(AVOptionRanges **, void *obj, const char *key, int flags);
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@ -56,7 +56,7 @@
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*/
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#define LIBAVUTIL_VERSION_MAJOR 52
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#define LIBAVUTIL_VERSION_MINOR 71
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#define LIBAVUTIL_VERSION_MINOR 72
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#define LIBAVUTIL_VERSION_MICRO 100
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#define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
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