diff options
Diffstat (limited to 'libavutil/tx_priv.h')
| -rw-r--r-- | libavutil/tx_priv.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/libavutil/tx_priv.h b/libavutil/tx_priv.h index 207f79dfb8..f11061d051 100644 --- a/libavutil/tx_priv.h +++ b/libavutil/tx_priv.h @@ -183,6 +183,9 @@ typedef struct FFTXCodeletOptions { /* Maximum amount of subtransform functions, subtransforms and factors. Arbitrary. */ #define TX_MAX_SUB 4 +/* Maximum number of returned results for ff_tx_decompose_length. Arbitrary. */ +#define TX_MAX_DECOMPOSITIONS 512 + typedef struct FFTXCodelet { const char *name; /* Codelet name, for debugging */ av_tx_fn function; /* Codelet function, != NULL */ @@ -284,6 +287,11 @@ int ff_tx_init_subtx(AVTXContext *s, enum AVTXType type, /* Clear the context by freeing all tables, maps and subtransforms. */ void ff_tx_clear_ctx(AVTXContext *s); +/* Attempt to factorize a length into 2 integers such that + * len / dst1 == dst2, where dst1 and dst2 are coprime. */ +int ff_tx_decompose_length(int dst[TX_MAX_DECOMPOSITIONS], enum AVTXType type, + int len, int inv); + /* Generate a default map (0->len or 0, (len-1)->1 for inverse transforms) * for a context. */ int ff_tx_gen_default_map(AVTXContext *s, FFTXCodeletOptions *opts); |