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Merge commit '8199bb7be0db423bcbbd252d092386634fcf1d68'

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* commit '8199bb7be0db423bcbbd252d092386634fcf1d68':
  dsputil.h: Clean up comments

Conflicts:
	libavcodec/dsputil.h

Merged-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-03-14 00:10:31 +01:00
commit 153557dfcb
1 changed files with 46 additions and 39 deletions
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79
libavcodec/dsputil.h
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@ -23,8 +23,8 @@
/**
* @file
* DSP utils.
* note, many functions in here may use MMX which trashes the FPU state, it is
* absolutely necessary to call emms_c() between dsp & float/double code
* Note, many functions in here may use MMX which trashes the FPU state, it is
* absolutely necessary to call emms_c() between DSP & float/double code.
*/
#ifndef AVCODEC_DSPUTIL_H
@ -61,21 +61,22 @@ void ff_gmc_c(uint8_t *dst, uint8_t *src, int stride, int h, int ox, int oy,
int dxx, int dxy, int dyx, int dyy, int shift, int r, int width, int height);
/* minimum alignment rules ;)
If you notice errors in the align stuff, need more alignment for some ASM code
for some CPU or need to use a function with less aligned data then send a mail
to the ffmpeg-devel mailing list, ...
!warning These alignments might not match reality, (missing attribute((align))
stuff somewhere possible).
I (Michael) did not check them, these are just the alignments which I think
could be reached easily ...
!future video codecs might need functions with less strict alignment
* If you notice errors in the align stuff, need more alignment for some ASM code
* for some CPU or need to use a function with less aligned data then send a mail
* to the ffmpeg-devel mailing list, ...
*
* !warning These alignments might not match reality, (missing attribute((align))
* stuff somewhere possible).
* I (Michael) did not check them, these are just the alignments which I think
* could be reached easily ...
*
* !future video codecs might need functions with less strict alignment
*/
/* add and put pixel (decoding) */
// blocksizes for op_pixels_func are 8x4,8x8 16x8 16x16
//h for op_pixels_func is limited to {width/2, width} but never larger than 16 and never smaller than 4
/* add and put pixel (decoding)
* Block sizes for op_pixels_func are 8x4,8x8 16x8 16x16.
* h for op_pixels_func is limited to { width / 2, width },
* but never larger than 16 and never smaller than 4. */
typedef void (*tpel_mc_func)(uint8_t *block/*align width (8 or 16)*/, const uint8_t *pixels/*align 1*/, int line_size, int w, int h);
typedef void (*qpel_mc_func)(uint8_t *dst/*align width (8 or 16)*/, uint8_t *src/*align 1*/, ptrdiff_t stride);
@ -99,10 +100,14 @@ DEF_OLD_QPEL(qpel8_mc32_old_c)
DEF_OLD_QPEL(qpel8_mc13_old_c)
DEF_OLD_QPEL(qpel8_mc33_old_c)
/* motion estimation */
// h is limited to {width/2, width, 2*width} but never larger than 16 and never smaller than 2
// although currently h<4 is not used as functions with width <8 are neither used nor implemented
typedef int (*me_cmp_func)(void /*MpegEncContext*/ *s, uint8_t *blk1/*align width (8 or 16)*/, uint8_t *blk2/*align 1*/, int line_size, int h)/* __attribute__ ((const))*/;
/* Motion estimation:
* h is limited to { width / 2, width, 2 * width },
* but never larger than 16 and never smaller than 2.
* Although currently h < 4 is not used as functions with
* width < 8 are neither used nor implemented. */
typedef int (*me_cmp_func)(void /* MpegEncContext */ *s,
uint8_t *blk1 /* align width (8 or 16) */,
uint8_t *blk2 /* align 1 */, int line_size, int h);
/**
* Scantable.
@ -142,7 +147,6 @@ typedef struct DSPContext {
void (*clear_blocks)(int16_t *blocks/*align 16*/);
int (*pix_sum)(uint8_t * pix, int line_size);
int (*pix_norm1)(uint8_t * pix, int line_size);
// 16x16 8x8 4x4 2x2 16x8 8x4 4x2 8x16 4x8 2x4
me_cmp_func sad[6]; /* identical to pix_absAxA except additional void * */
me_cmp_func sse[6];
@ -171,8 +175,8 @@ typedef struct DSPContext {
/**
* Thirdpel motion compensation with rounding (a + b + 1) >> 1.
* this is an array[12] of motion compensation functions for the 9 thirdpe
* positions<br>
* this is an array[12] of motion compensation functions for the
* 9 thirdpel positions<br>
* *pixels_tab[xthirdpel + 4 * ythirdpel]
* @param block destination where the result is stored
* @param pixels source
@ -189,12 +193,12 @@ typedef struct DSPContext {
me_cmp_func pix_abs[2][4];
/* huffyuv specific */
/* HuffYUV specific */
void (*add_bytes)(uint8_t *dst/*align 16*/, uint8_t *src/*align 16*/, int w);
void (*diff_bytes)(uint8_t *dst/*align 16*/, const uint8_t *src1/*align 16*/, const uint8_t *src2/*align 1*/,int w);
/**
* subtract huffyuv's variant of median prediction
* note, this might read from src1[-1], src2[-1]
* Subtract HuffYUV's variant of median prediction.
* Note, this might read from src1[-1], src2[-1].
*/
void (*sub_hfyu_median_prediction)(uint8_t *dst, const uint8_t *src1, const uint8_t *src2, int w, int *left, int *left_top);
void (*add_hfyu_median_prediction)(uint8_t *dst, const uint8_t *top, const uint8_t *diff, int w, int *left, int *left_top);
@ -228,16 +232,18 @@ typedef struct DSPContext {
void (*idct_add)(uint8_t *dest/*align 8*/, int line_size, int16_t *block/*align 16*/);
/**
* idct input permutation.
* several optimized IDCTs need a permutated input (relative to the normal order of the reference
* IDCT)
* this permutation must be performed before the idct_put/add, note, normally this can be merged
* with the zigzag/alternate scan<br>
* an example to avoid confusion:
* - (->decode coeffs -> zigzag reorder -> dequant -> reference idct ->...)
* - (x -> reference dct -> reference idct -> x)
* - (x -> reference dct -> simple_mmx_perm = idct_permutation -> simple_idct_mmx -> x)
* - (->decode coeffs -> zigzag reorder -> simple_mmx_perm -> dequant -> simple_idct_mmx ->...)
* IDCT input permutation.
* Several optimized IDCTs need a permutated input (relative to the
* normal order of the reference IDCT).
* This permutation must be performed before the idct_put/add.
* Note, normally this can be merged with the zigzag/alternate scan<br>
* An example to avoid confusion:
* - (->decode coeffs -> zigzag reorder -> dequant -> reference IDCT -> ...)
* - (x -> reference DCT -> reference IDCT -> x)
* - (x -> reference DCT -> simple_mmx_perm = idct_permutation
* -> simple_idct_mmx -> x)
* - (-> decode coeffs -> zigzag reorder -> simple_mmx_perm -> dequant
* -> simple_idct_mmx -> ...)
*/
uint8_t idct_permutation[64];
int idct_permutation_type;
@ -274,7 +280,8 @@ typedef struct DSPContext {
int32_t (*scalarproduct_and_madd_int16)(int16_t *v1/*align 16*/, const int16_t *v2, const int16_t *v3, int len, int mul);
/**
* Clip each element in an array of int32_t to a given minimum and maximum value.
* Clip each element in an array of int32_t to a given minimum and
* maximum value.
* @param dst destination array
* constraints: 16-byte aligned
* @param src source array