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403 results
Show changes
Commits on Source (2)
......@@ -136,7 +136,7 @@ struct block_t
* Initializes a custom block.
*
* This function initialize a block of timed data allocated by custom means.
* This allows passing data with copying even if the data has been allocated
* This allows passing data without copying even if the data has been allocated
* with unusual means or outside of LibVLC.
*
* Normally, blocks are allocated and initialized by block_Alloc() instead.
......@@ -317,18 +317,29 @@ static inline void block_Cleanup (void *block)
* @{
*/
/****************************************************************************
* Chains of blocks functions helper
****************************************************************************
* - block_ChainAppend : append a block to the last block of a chain. Try to
* avoid using with a lot of data as it's really slow, prefer
* block_ChainLastAppend, p_block can be NULL
* - block_ChainLastAppend : use a pointer over a pointer to the next blocks,
* and update it.
* - block_ChainRelease : release a chain of block
* - block_ChainExtract : extract data from a chain, return real bytes counts
* - block_ChainGather : gather a chain, free it and return one block.
****************************************************************************/
/**
* Appends a @ref block_t to the chain
*
* The given block is appended to the last block of the given chain.
*
* @attention
* Using this function on long chains or repeatedly calling it
* to append a lot of blocks can be slow, as it has to iterate the
* whole chain to append the block.
* In these cases @ref block_ChainLastAppend should be used.
*
* @param pp_list Pointer to the block_t chain
* @param p_block The block_t to append (can be NULL)
*
* @see block_ChainLastAppend()
*
* Example:
* @code{.c}
* block_t *p_chain = NULL;
*
* block_ChainAppend(&p_chain, p_block);
* @endcode
*/
static inline void block_ChainAppend( block_t **pp_list, block_t *p_block )
{
if( *pp_list == NULL )
......@@ -344,6 +355,26 @@ static inline void block_ChainAppend( block_t **pp_list, block_t *p_block )
}
}
/**
* Appends a @ref block_t to the last block pointer and update it
*
* Uses a pointer over a pointer to p_next of the last block of the block chain
* to append a block at the end of the chain and updates the pointer to the new
* last block's @c p_next. If the appended block is itself a chain, it is iterated
* till the end to correctly update @c ppp_last.
*
* @param[in,out] ppp_last Pointer to pointer to the end of the chain
* (The block_t::p_next of the last block_t in the chain)
* @param p_block The block_t to append
*
* Example:
* @code{.c}
* block_t *p_block = NULL;
* block_t **pp_block_last = &p_block;
*
* block_ChainLastAppend(&pp_block_last, p_other_block);
* @endcode
*/
static inline void block_ChainLastAppend( block_t ***ppp_last, block_t *p_block )
{
block_t *p_last = p_block;
......@@ -354,6 +385,16 @@ static inline void block_ChainLastAppend( block_t ***ppp_last, block_t *p_block
*ppp_last = &p_last->p_next;
}
/**
* Releases a chain of blocks
*
* The block pointed to by p_block and all following blocks in the
* chain are released.
*
* @param p_block Pointer to first block_t of the chain to release
*
* @see block_Release()
*/
static inline void block_ChainRelease( block_t *p_block )
{
while( p_block )
......@@ -364,6 +405,20 @@ static inline void block_ChainRelease( block_t *p_block )
}
}
/**
* Extracts data from a chain of blocks
*
* Copies the specified amount of data from the chain into the given buffer.
* If the data in the chain is less than the maximum amount given, the remainder
* of the buffer is not modified.
*
* @param p_list Pointer to the first block_t of the chain to copy from
* @param[out] p_data Destination buffer to copy the data to
* @param i_max Number of bytes to copy
* @return Number of bytes actually copied
*
* @see block_ChainGather()
*/
static size_t block_ChainExtract( block_t *p_list, void *p_data, size_t i_max )
{
size_t i_total = 0;
......@@ -382,6 +437,17 @@ static size_t block_ChainExtract( block_t *p_list, void *p_data, size_t i_max )
return i_total;
}
/**
* Retrives chain properties
*
* Can be used to retrieve count of blocks, number of bytes and the duration
* of the chain.
*
* @param p_list Pointer to the first block_t of the chain
* @param[out] pi_count Pointer to count of blocks in the chain (may be NULL)
* @param[out] pi_size Pointer to number of bytes in the chain (may be NULL)
* @param[out] pi_length Pointer to length (duration) of the chain (may be NULL)
*/
static inline void block_ChainProperties( block_t *p_list, int *pi_count, size_t *pi_size, vlc_tick_t *pi_length )
{
size_t i_size = 0;
......@@ -405,6 +471,20 @@ static inline void block_ChainProperties( block_t *p_list, int *pi_count, size_t
*pi_count = i_count;
}
/**
* Gathers a chain into a single block_t
*
* All blocks in the chain are gathered into a single block_t and the
* original chain is released.
*
* @param p_list Pointer to the first block_t of the chain to gather
* @return Returns a pointer to a new block_t or NULL if the block can not
* be allocated, in which case the original chain is not released.
* If the chain pointed to by p_list is already gathered, a pointer
* to it is returned and no new block will be allocated.
*
* @see block_ChainExtract()
*/
static inline block_t *block_ChainGather( block_t *p_list )
{
size_t i_total = 0;
......