67 unsigned high_bit_depth)
71 if (!avctx->
lowres && !high_bit_depth) {
#define have_armv6(flags)
void ff_idctdsp_init_neon(IDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
static atomic_int cpu_flags
Macro definitions for various function/variable attributes.
void ff_j_rev_dct_arm(int16_t *data)
The exact code depends on how similar the blocks are and how related they are to the block
#define have_armv5te(flags)
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
int lowres
low resolution decoding, 1-> 1/2 size, 2->1/4 size
#define FF_IDCT_SIMPLEARM
int flags
AV_CODEC_FLAG_*.
void ff_simple_idct_arm(int16_t *data)
#define AV_CODEC_FLAG_BITEXACT
Use only bitexact stuff (except (I)DCT).
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
void(* idct_add)(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
block -> idct -> add dest -> clip to unsigned 8 bit -> dest.
void ff_idctdsp_init_armv5te(IDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
void ff_idctdsp_init_armv6(IDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
void(* idct_put)(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
block -> idct -> clip to unsigned 8 bit -> dest.
void ff_put_pixels_clamped_c(const int16_t *block, uint8_t *av_restrict pixels, ptrdiff_t line_size)
Libavcodec external API header.
main external API structure.
static void j_rev_dct_arm_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
av_cold void ff_idctdsp_init_arm(IDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
static void j_rev_dct_arm_put(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
static void simple_idct_arm_put(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
static void simple_idct_arm_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
void ff_add_pixels_clamped_arm(const int16_t *block, uint8_t *dest, ptrdiff_t line_size)
void(* idct)(int16_t *block)
enum idct_permutation_type perm_type
void(* add_pixels_clamped)(const int16_t *block, uint8_t *av_restrict pixels, ptrdiff_t line_size)