Commit def14b82 authored by Jean-Paul Saman's avatar Jean-Paul Saman

Document filter chain API.

parent 496e7390
......@@ -35,7 +35,7 @@
typedef struct filter_owner_sys_t filter_owner_sys_t;
/** Structure describing a filter
* @warning BIG FAT WARNING : the code relies in the first 4 members of
* @warning BIG FAT WARNING : the code relies on the first 4 members of
* filter_t and decoder_t to be the same, so if you have anything to add,
* do it at the end of the structure.
*/
......@@ -95,6 +95,9 @@ struct filter_t
* buffer. You have to release it using filter_DeletePicture or by returning
* it to the caller as a pf_video_filter return value.
* Provided for convenience.
*
* \param p_filter filter_t object
* \return new picture on success or NULL on failure
*/
static inline picture_t *filter_NewPicture( filter_t *p_filter )
{
......@@ -107,6 +110,9 @@ static inline picture_t *filter_NewPicture( filter_t *p_filter )
/**
* This function will release a picture create by filter_NewPicture.
* Provided for convenience.
*
* \param p_filter filter_t object
* \param p_picture picture to be deleted
*/
static inline void filter_DeletePicture( filter_t *p_filter, picture_t *p_picture )
{
......@@ -118,6 +124,9 @@ static inline void filter_DeletePicture( filter_t *p_filter, picture_t *p_pictur
* buffer. You have to release it using filter_DeleteSubpicture or by returning
* it to the caller as a pf_sub_filter return value.
* Provided for convenience.
*
* \param p_filter filter_t object
* \return new subpicture
*/
static inline subpicture_t *filter_NewSubpicture( filter_t *p_filter )
{
......@@ -130,6 +139,9 @@ static inline subpicture_t *filter_NewSubpicture( filter_t *p_filter )
/**
* This function will release a subpicture create by filter_NewSubicture.
* Provided for convenience.
*
* \param p_filter filter_t object
* \param p_subpicture to be released
*/
static inline void filter_DeleteSubpicture( filter_t *p_filter, subpicture_t *p_subpicture )
{
......@@ -141,6 +153,10 @@ static inline void filter_DeleteSubpicture( filter_t *p_filter, subpicture_t *p_
* output buffer. You have to release it using block_Release or by returning
* it to the caller as a pf_audio_filter return value.
* Provided for convenience.
*
* \param p_filter filter_t object
* \param i_size size of audio buffer requested
* \return block to be used as audio output buffer
*/
static inline block_t *filter_NewAudioBuffer( filter_t *p_filter, int i_size )
{
......@@ -150,7 +166,6 @@ static inline block_t *filter_NewAudioBuffer( filter_t *p_filter, int i_size )
return p_block;
}
/**
* Create a picture_t *(*)( filter_t *, picture_t * ) compatible wrapper
* using a void (*)( filter_t *, picture_t *, picture_t * ) function
......@@ -178,28 +193,127 @@ static inline block_t *filter_NewAudioBuffer( filter_t *p_filter, int i_size )
/**
* Filter chain management API
* The filter chain management API is used to dynamically construct filters
* and add them in a chain.
*/
typedef struct filter_chain_t filter_chain_t;
/**
* Create new filter chain
*
* \param p_object pointer to a vlc object
* \param psz_capability vlc capability of filters in filter chain
* \param b_allow_format_fmt_change allow changing of fmt
* \param pf_buffer_allocation_init callback function to initialize buffer allocations
* \param pf_buffer_allocation_clear callback function to clear buffer allocation initialization
* \param p_buffer_allocation_data pointer to private allocation data
* \return pointer to a filter chain
*/
VLC_EXPORT( filter_chain_t *, __filter_chain_New, ( vlc_object_t *, const char *, bool, int (*)( filter_t *, void * ), void (*)( filter_t * ), void * ) );
#define filter_chain_New( a, b, c, d, e, f ) __filter_chain_New( VLC_OBJECT( a ), b, c, d, e, f )
/**
* Delete filter chain will delete all filters in the chain and free all
* allocated data. The pointer to the filter chain is then no longer valid.
*
* \param p_chain pointer to filter chain
*/
VLC_EXPORT( void, filter_chain_Delete, ( filter_chain_t * ) );
/**
* Reset filter chain will delete all filters in the chain and
* reset p_fmt_in and p_fmt_out to the new values.
*
* \param p_chain pointer to filter chain
* \param p_fmt_in new fmt_in params
* \param p_fmt_out new fmt_out params
*/
VLC_EXPORT( void, filter_chain_Reset, ( filter_chain_t *, const es_format_t *, const es_format_t * ) );
/**
* Append filter to the end of the chain.
*
* \param p_chain pointer to filter chain
* \param psz_name name of filter
* \param p_cfg
* \param p_fmt_in input es_format_t
* \param p_fmt_out output es_format_t
* \return pointer to filter chain
*/
VLC_EXPORT( filter_t *, filter_chain_AppendFilter, ( filter_chain_t *, const char *, config_chain_t *, const es_format_t *, const es_format_t * ) );
/**
* Append new filter to filter chain from string.
*
* \param p_chain pointer to filter chain
* \param psz_string string of filters
* \return 0 for success
*/
VLC_EXPORT( int, filter_chain_AppendFromString, ( filter_chain_t *, const char * ) );
/**
* Delete filter from filter chain. This function also releases the filter
* object and unloads the filter modules. The pointer to p_filter is no
* longer valid after this function successfully returns.
*
* \param p_chain pointer to filter chain
* \param p_filter pointer to filter object
* \return VLC_SUCCESS on succes, else VLC_EGENERIC
*/
VLC_EXPORT( int, filter_chain_DeleteFilter, ( filter_chain_t *, filter_t * ) );
/**
* Get filter by name of position in the filter chain.
*
* \param p_chain pointer to filter chain
* \param i_position position of filter in filter chain
* \param psz_name name of filter to get
* \return filter object based on position or name provided
*/
VLC_EXPORT( filter_t *, filter_chain_GetFilter, ( filter_chain_t *, int, const char * ) );
/**
* Get the number of filters in the filter chain.
*
* \param p_chain pointer to filter chain
* \return number of filters in this filter chain
*/
VLC_EXPORT( int, filter_chain_GetLength, ( filter_chain_t * ) );
/**
* Get last p_fmt_out in the chain.
*
* \param p_chain pointer to filter chain
* \return last p_fmt (es_format_t) of this filter chain
*/
VLC_EXPORT( const es_format_t *, filter_chain_GetFmtOut, ( filter_chain_t * ) );
/**
* Apply the filter chain
* Apply the filter chain to a video picture.
*
* \param p_chain pointer to filter chain
* \param p_picture picture to apply filters on
* \return modified picture after applying all video filters
*/
VLC_EXPORT( picture_t *, filter_chain_VideoFilter, ( filter_chain_t *, picture_t * ) );
/**
* Apply the filter chain to a audio block.
*
* \param p_chain pointer to filter chain
* \param p_block audio frame to apply filters on
* \return modified audio frame after applying all audio filters
*/
VLC_EXPORT( block_t *, filter_chain_AudioFilter, ( filter_chain_t *, block_t * ) );
/**
* Apply filter chain to subpictures.
*
* \param p_chain pointer to filter chain
* \param display_date of subpictures
*/
VLC_EXPORT( void, filter_chain_SubFilter, ( filter_chain_t *, mtime_t ) );
#endif /* _VLC_FILTER_H */
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