36 for (i = 0; i < 64; i++) {
37 int j = src_scantable[
i];
42 for (i = 0; i < 64; i++) {
62 for (i = 0; i < 64; i++)
63 idct_permutation[i] = i;
66 for (i = 0; i < 64; i++)
67 idct_permutation[i] = (i & 0x38) | ((i & 6) >> 1) | ((i & 1) << 2);
70 for (i = 0; i < 64; i++)
71 idct_permutation[i] = ((i & 7) << 3) | (i >> 3);
74 for (i = 0; i < 64; i++)
75 idct_permutation[i] = (i & 0x24) | ((i & 3) << 3) | ((i >> 3) & 3);
79 "Internal error, IDCT permutation not set\n");
89 for (i = 0; i < 8; i++) {
142 for (i = 0; i < 8; i++) {
143 for (j = 0; j < 8; j++) {
146 else if (*block > 127)
149 *pixels = (
uint8_t) (*block + 128);
153 pixels += (line_size - 8);
163 for (i = 0; i < 8; i++) {
247 }
else if (avctx->
lowres==2) {
252 }
else if (avctx->
lowres==3) {
void ff_idctdsp_init_x86(IDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
int ff_init_scantable_permutation_x86(uint8_t *idct_permutation, enum idct_permutation_type perm_type)
static void put_pixels_clamped4_c(const int16_t *block, uint8_t *av_restrict pixels, int line_size)
void ff_j_rev_dct4(int16_t *data)
void(* put_pixels_clamped)(const int16_t *block, uint8_t *av_restrict pixels, ptrdiff_t line_size)
void ff_faanidct_put(uint8_t *dest, ptrdiff_t line_size, int16_t block[64])
void ff_simple_idct_int16_8bit(int16_t *block)
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Macro definitions for various function/variable attributes.
static void add_pixels_clamped4_c(const int16_t *block, uint8_t *av_restrict pixels, int line_size)
av_cold void ff_idctdsp_init_ppc(IDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
The exact code depends on how similar the blocks are and how related they are to the block
void ff_faanidct(int16_t block[64])
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
static void ff_jref_idct2_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
static void put_signed_pixels_clamped_c(const int16_t *block, uint8_t *av_restrict pixels, ptrdiff_t line_size)
void ff_simple_idct_int16_12bit(int16_t *block)
const uint8_t * scantable
int lowres
low resolution decoding, 1-> 1/2 size, 2->1/4 size
void ff_jref_idct_put(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
void ff_add_pixels_clamped_c(const int16_t *block, uint8_t *av_restrict pixels, ptrdiff_t line_size)
av_cold void ff_xvid_idct_init(IDCTDSPContext *c, AVCodecContext *avctx)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
void ff_simple_idct_add_int16_10bit(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
void ff_jref_idct_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
void ff_idctdsp_init_mips(IDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
void(* put_signed_pixels_clamped)(const int16_t *block, uint8_t *av_restrict pixels, ptrdiff_t line_size)
void ff_faanidct_add(uint8_t *dest, ptrdiff_t line_size, int16_t block[64])
static void ff_jref_idct1_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
av_cold void ff_init_scantable_permutation(uint8_t *idct_permutation, enum idct_permutation_type perm_type)
av_cold void ff_idctdsp_init_alpha(IDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
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.
uint8_t idct_permutation[64]
IDCT input permutation.
static void put_pixels_clamped2_c(const int16_t *block, uint8_t *av_restrict pixels, int line_size)
void(* idct_put)(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
block -> idct -> clip to unsigned 8 bit -> dest.
void ff_simple_idct_put_int16_10bit(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
void ff_put_pixels_clamped_c(const int16_t *block, uint8_t *av_restrict pixels, ptrdiff_t line_size)
void ff_j_rev_dct1(int16_t *data)
void ff_j_rev_dct(int16_t *data)
void ff_simple_idct_add_int16_12bit(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
Libavcodec external API header.
main external API structure.
static void ff_jref_idct4_put(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)
static void add_pixels_clamped2_c(const int16_t *block, uint8_t *av_restrict pixels, int line_size)
av_cold void ff_idctdsp_init_aarch64(IDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
void ff_simple_idct_int16_10bit(int16_t *block)
void ff_j_rev_dct2(int16_t *data)
static void ff_jref_idct4_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
common internal and external API header
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
av_cold void ff_idctdsp_init(IDCTDSPContext *c, AVCodecContext *avctx)
void ff_simple_idct_add_int16_8bit(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
void ff_simple_idct_put_int32_10bit(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
void ff_simple_idct_put_int16_8bit(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
static void ff_jref_idct2_put(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
void(* idct)(int16_t *block)
static void ff_jref_idct1_put(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
void ff_simple_idct_put_int16_12bit(uint8_t *dest, ptrdiff_t line_size, 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)