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@ -52,6 +52,7 @@ const char *avfilter_license(void); |
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typedef struct AVFilterContext AVFilterContext; |
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typedef struct AVFilterLink AVFilterLink; |
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typedef struct AVFilterPad AVFilterPad; |
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typedef struct AVFilterFormats AVFilterFormats; |
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/**
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* A reference-counted buffer data type used by the filter system. Filters |
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@ -197,134 +198,42 @@ AVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask); |
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*/ |
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void avfilter_unref_buffer(AVFilterBufferRef *ref); |
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#if FF_API_FILTERS_PUBLIC |
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/**
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* A list of supported formats for one end of a filter link. This is used |
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* during the format negotiation process to try to pick the best format to |
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* use to minimize the number of necessary conversions. Each filter gives a |
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* list of the formats supported by each input and output pad. The list |
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* given for each pad need not be distinct - they may be references to the |
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* same list of formats, as is often the case when a filter supports multiple |
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* formats, but will always output the same format as it is given in input. |
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* |
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* In this way, a list of possible input formats and a list of possible |
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* output formats are associated with each link. When a set of formats is |
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* negotiated over a link, the input and output lists are merged to form a |
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* new list containing only the common elements of each list. In the case |
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* that there were no common elements, a format conversion is necessary. |
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* Otherwise, the lists are merged, and all other links which reference |
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* either of the format lists involved in the merge are also affected. |
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* |
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* For example, consider the filter chain: |
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* filter (a) --> (b) filter (b) --> (c) filter |
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* |
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* where the letters in parenthesis indicate a list of formats supported on |
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* the input or output of the link. Suppose the lists are as follows: |
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* (a) = {A, B} |
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* (b) = {A, B, C} |
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* (c) = {B, C} |
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* |
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* First, the first link's lists are merged, yielding: |
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* filter (a) --> (a) filter (a) --> (c) filter |
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* |
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* Notice that format list (b) now refers to the same list as filter list (a). |
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* Next, the lists for the second link are merged, yielding: |
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* filter (a) --> (a) filter (a) --> (a) filter |
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* |
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* where (a) = {B}. |
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* |
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* Unfortunately, when the format lists at the two ends of a link are merged, |
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* we must ensure that all links which reference either pre-merge format list |
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* get updated as well. Therefore, we have the format list structure store a |
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* pointer to each of the pointers to itself. |
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* @addtogroup lavfi_deprecated |
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* @deprecated Those functions are only useful inside filters and |
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* user filters are not supported at this point. |
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* @{ |
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*/ |
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typedef struct AVFilterFormats { |
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struct AVFilterFormats { |
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unsigned format_count; ///< number of formats
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int *formats; ///< list of media formats
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unsigned refcount; ///< number of references to this list
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struct AVFilterFormats ***refs; ///< references to this list
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} AVFilterFormats; |
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}; |
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/**
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* Create a list of supported formats. This is intended for use in |
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* AVFilter->query_formats(). |
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* |
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* @param fmts list of media formats, terminated by -1 |
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* @return the format list, with no existing references |
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*/ |
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attribute_deprecated |
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AVFilterFormats *avfilter_make_format_list(const int *fmts); |
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/**
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* Add fmt to the list of media formats contained in *avff. |
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* If *avff is NULL the function allocates the filter formats struct |
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* and puts its pointer in *avff. |
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* |
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* @return a non negative value in case of success, or a negative |
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* value corresponding to an AVERROR code in case of error |
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*/ |
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attribute_deprecated |
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int avfilter_add_format(AVFilterFormats **avff, int fmt); |
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/**
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* Return a list of all formats supported by Libav for the given media type. |
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*/ |
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attribute_deprecated |
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AVFilterFormats *avfilter_all_formats(enum AVMediaType type); |
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/**
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* Return a format list which contains the intersection of the formats of |
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* a and b. Also, all the references of a, all the references of b, and |
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* a and b themselves will be deallocated. |
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* |
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* If a and b do not share any common formats, neither is modified, and NULL |
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* is returned. |
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*/ |
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attribute_deprecated |
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AVFilterFormats *avfilter_merge_formats(AVFilterFormats *a, AVFilterFormats *b); |
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/**
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* Add *ref as a new reference to formats. |
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* That is the pointers will point like in the ascii art below: |
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* ________ |
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* |formats |<--------. |
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* | ____ | ____|___________________ |
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* | |refs| | | __|_ |
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* | |* * | | | | | | AVFilterLink |
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* | |* *--------->|*ref| |
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* | |____| | | |____| |
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* |________| |________________________ |
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*/ |
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attribute_deprecated |
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void avfilter_formats_ref(AVFilterFormats *formats, AVFilterFormats **ref); |
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/**
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* If *ref is non-NULL, remove *ref as a reference to the format list |
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* it currently points to, deallocates that list if this was the last |
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* reference, and sets *ref to NULL. |
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* |
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* Before After |
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* ________ ________ NULL |
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* |formats |<--------. |formats | ^ |
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* | ____ | ____|________________ | ____ | ____|________________ |
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* | |refs| | | __|_ | |refs| | | __|_ |
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* | |* * | | | | | | AVFilterLink | |* * | | | | | | AVFilterLink |
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* | |* *--------->|*ref| | |* | | | |*ref| |
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* | |____| | | |____| | |____| | | |____| |
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* |________| |_____________________ |________| |_____________________ |
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*/ |
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attribute_deprecated |
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void avfilter_formats_unref(AVFilterFormats **ref); |
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/**
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* |
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* Before After |
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* ________ ________ |
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* |formats |<---------. |formats |<---------. |
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* | ____ | ___|___ | ____ | ___|___ |
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* | |refs| | | | | | |refs| | | | | NULL |
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* | |* *--------->|*oldref| | |* *--------->|*newref| ^ |
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* | |* * | | |_______| | |* * | | |_______| ___|___ |
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* | |____| | | |____| | | | | |
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* |________| |________| |*oldref| |
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* |_______| |
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*/ |
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attribute_deprecated |
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void avfilter_formats_changeref(AVFilterFormats **oldref, |
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AVFilterFormats **newref); |
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attribute_deprecated |
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void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats); |
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/**
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* @} |
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*/ |
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#endif |
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/**
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* A filter pad used for either input or output. |
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@ -479,13 +388,6 @@ attribute_deprecated |
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int avfilter_default_query_formats(AVFilterContext *ctx); |
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#endif |
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/**
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* A helper for query_formats() which sets all links to the same list of |
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* formats. If there are no links hooked to this filter, the list of formats is |
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* freed. |
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*/ |
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void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats); |
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#if FF_API_FILTERS_PUBLIC |
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/** start_frame() handler for filters which simply pass video along */ |
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attribute_deprecated |
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Anton Khirnov
13 years ago