External Memory Allocation Functions
[Common Algorithm Interface]

Data Structures

struct  vpx_codec_mmap
 Memory Map Entry. More...

Typedefs

typedef struct vpx_codec_mmap vpx_codec_mmap_t
 Memory Map Entry.

Functions

vpx_codec_err_t vpx_codec_get_mem_map (vpx_codec_ctx_t *ctx, vpx_codec_mmap_t *mmap, vpx_codec_iter_t *iter)
 Iterate over the list of segments to allocate.
vpx_codec_err_t vpx_codec_set_mem_map (vpx_codec_ctx_t *ctx, vpx_codec_mmap_t *mmaps, unsigned int num_maps)
 Identify allocated segments to codec instance.

Detailed Description

The following functions are required to be implemented for all codecs that advertise the VPX_CODEC_CAP_XMA capability. Calling these functions for codecs that don't advertise this capability will result in an error code being returned, usually VPX_CODEC_INCAPABLE


Typedef Documentation

Memory Map Entry.

This structure is used to contain the properties of a memory segment. It is populated by the codec in the request phase, and by the calling application once the requested allocation has been performed. alias for struct vpx_codec_mmap


Function Documentation

vpx_codec_err_t vpx_codec_get_mem_map ( vpx_codec_ctx_t ctx,
vpx_codec_mmap_t mmap,
vpx_codec_iter_t iter 
)

Iterate over the list of segments to allocate.

Iterates over a list of the segments to allocate. The iterator storage should be initialized to NULL to start the iteration. Iteration is complete when this function returns VPX_CODEC_LIST_END. The amount of memory needed to allocate is dependent upon the size of the encoded stream. In cases where the stream is not available at allocation time, a fixed size must be requested. The codec will not be able to operate on streams larger than the size used at allocation time.

Parameters:
[in] ctx Pointer to this instance's context.
[out] mmap Pointer to the memory map entry to populate.
[in,out] iter Iterator storage, initialized to NULL
Return values:
VPX_CODEC_OK The memory map entry was populated.
VPX_CODEC_ERROR Codec does not support XMA mode.
VPX_CODEC_MEM_ERROR Unable to determine segment size from stream info.
vpx_codec_err_t vpx_codec_set_mem_map ( vpx_codec_ctx_t ctx,
vpx_codec_mmap_t mmaps,
unsigned int  num_maps 
)

Identify allocated segments to codec instance.

Stores a list of allocated segments in the codec. Segments MUST be passed in the order they are read from vpx_codec_get_mem_map(), but may be passed in groups of any size. Segments MUST be set only once. The allocation function MUST ensure that the vpx_codec_mmap_t::base member is non-NULL. If the segment requires cleanup handling (e.g., calling free() or close()) then the vpx_codec_mmap_t::dtor member MUST be populated.

Parameters:
[in] ctx Pointer to this instance's context.
[in] mmaps Pointer to the first memory map entry in the list.
[in] num_maps Number of entries being set at this time
Return values:
VPX_CODEC_OK The segment was stored in the codec context.
VPX_CODEC_INCAPABLE Codec does not support XMA mode.
VPX_CODEC_MEM_ERROR Segment base address was not set, or segment was already stored.

Generated on 4 Dec 2017 for WebM VP8 Codec SDK by  doxygen 1.6.1