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media/libvpx/vp9/common/vp9_scale.c@6474c204b198 (annotated)

media/libvpx/vp9/common/vp9_scale.c

Wed, 31 Dec 2014 06:09:35 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Wed, 31 Dec 2014 06:09:35 +0100

changeset 0

6474c204b198

permissions

-rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

michael@0	1	/*
michael@0	2	* Copyright (c) 2013 The WebM project authors. All Rights Reserved.
michael@0	3	*
michael@0	4	* Use of this source code is governed by a BSD-style license
michael@0	5	* that can be found in the LICENSE file in the root of the source
michael@0	6	* tree. An additional intellectual property rights grant can be found
michael@0	7	* in the file PATENTS. All contributing project authors may
michael@0	8	* be found in the AUTHORS file in the root of the source tree.
michael@0	9	*/
michael@0	10
michael@0	11	#include "./vp9_rtcd.h"
michael@0	12	#include "vp9/common/vp9_filter.h"
michael@0	13	#include "vp9/common/vp9_scale.h"
michael@0	14
michael@0	15	static INLINE int scaled_x(int val, const struct scale_factors_common *sfc) {
michael@0	16	return val * sfc->x_scale_fp >> REF_SCALE_SHIFT;
michael@0	17	}
michael@0	18
michael@0	19	static INLINE int scaled_y(int val, const struct scale_factors_common *sfc) {
michael@0	20	return val * sfc->y_scale_fp >> REF_SCALE_SHIFT;
michael@0	21	}
michael@0	22
michael@0	23	static int unscaled_value(int val, const struct scale_factors_common *sfc) {
michael@0	24	(void) sfc;
michael@0	25	return val;
michael@0	26	}
michael@0	27
michael@0	28	static MV32 scaled_mv(const MV *mv, const struct scale_factors *scale) {
michael@0	29	const MV32 res = {
michael@0	30	scaled_y(mv->row, scale->sfc) + scale->y_offset_q4,
michael@0	31	scaled_x(mv->col, scale->sfc) + scale->x_offset_q4
michael@0	32	};
michael@0	33	return res;
michael@0	34	}
michael@0	35
michael@0	36	static MV32 unscaled_mv(const MV *mv, const struct scale_factors *scale) {
michael@0	37	const MV32 res = {
michael@0	38	mv->row,
michael@0	39	mv->col
michael@0	40	};
michael@0	41	return res;
michael@0	42	}
michael@0	43
michael@0	44	static void set_offsets_with_scaling(struct scale_factors *scale,
michael@0	45	int row, int col) {
michael@0	46	scale->x_offset_q4 = scaled_x(col << SUBPEL_BITS, scale->sfc) & SUBPEL_MASK;
michael@0	47	scale->y_offset_q4 = scaled_y(row << SUBPEL_BITS, scale->sfc) & SUBPEL_MASK;
michael@0	48	}
michael@0	49
michael@0	50	static void set_offsets_without_scaling(struct scale_factors *scale,
michael@0	51	int row, int col) {
michael@0	52	scale->x_offset_q4 = 0;
michael@0	53	scale->y_offset_q4 = 0;
michael@0	54	}
michael@0	55
michael@0	56	static int get_fixed_point_scale_factor(int other_size, int this_size) {
michael@0	57	// Calculate scaling factor once for each reference frame
michael@0	58	// and use fixed point scaling factors in decoding and encoding routines.
michael@0	59	// Hardware implementations can calculate scale factor in device driver
michael@0	60	// and use multiplication and shifting on hardware instead of division.
michael@0	61	return (other_size << REF_SCALE_SHIFT) / this_size;
michael@0	62	}
michael@0	63
michael@0	64	static int check_scale_factors(int other_w, int other_h,
michael@0	65	int this_w, int this_h) {
michael@0	66	return 2 * this_w >= other_w &&
michael@0	67	2 * this_h >= other_h &&
michael@0	68	this_w <= 16 * other_w &&
michael@0	69	this_h <= 16 * other_h;
michael@0	70	}
michael@0	71
michael@0	72	void vp9_setup_scale_factors_for_frame(struct scale_factors *scale,
michael@0	73	struct scale_factors_common *scale_comm,
michael@0	74	int other_w, int other_h,
michael@0	75	int this_w, int this_h) {
michael@0	76	if (!check_scale_factors(other_w, other_h, this_w, this_h)) {
michael@0	77	scale_comm->x_scale_fp = REF_INVALID_SCALE;
michael@0	78	scale_comm->y_scale_fp = REF_INVALID_SCALE;
michael@0	79	return;
michael@0	80	}
michael@0	81
michael@0	82	scale_comm->x_scale_fp = get_fixed_point_scale_factor(other_w, this_w);
michael@0	83	scale_comm->y_scale_fp = get_fixed_point_scale_factor(other_h, this_h);
michael@0	84	scale_comm->x_step_q4 = scaled_x(16, scale_comm);
michael@0	85	scale_comm->y_step_q4 = scaled_y(16, scale_comm);
michael@0	86
michael@0	87	if (vp9_is_scaled(scale_comm)) {
michael@0	88	scale_comm->scale_value_x = scaled_x;
michael@0	89	scale_comm->scale_value_y = scaled_y;
michael@0	90	scale_comm->set_scaled_offsets = set_offsets_with_scaling;
michael@0	91	scale_comm->scale_mv = scaled_mv;
michael@0	92	} else {
michael@0	93	scale_comm->scale_value_x = unscaled_value;
michael@0	94	scale_comm->scale_value_y = unscaled_value;
michael@0	95	scale_comm->set_scaled_offsets = set_offsets_without_scaling;
michael@0	96	scale_comm->scale_mv = unscaled_mv;
michael@0	97	}
michael@0	98
michael@0	99	// TODO(agrange): Investigate the best choice of functions to use here
michael@0	100	// for EIGHTTAP_SMOOTH. Since it is not interpolating, need to choose what
michael@0	101	// to do at full-pel offsets. The current selection, where the filter is
michael@0	102	// applied in one direction only, and not at all for 0,0, seems to give the
michael@0	103	// best quality, but it may be worth trying an additional mode that does
michael@0	104	// do the filtering on full-pel.
michael@0	105	if (scale_comm->x_step_q4 == 16) {
michael@0	106	if (scale_comm->y_step_q4 == 16) {
michael@0	107	// No scaling in either direction.
michael@0	108	scale_comm->predict[0][0][0] = vp9_convolve_copy;
michael@0	109	scale_comm->predict[0][0][1] = vp9_convolve_avg;
michael@0	110	scale_comm->predict[0][1][0] = vp9_convolve8_vert;
michael@0	111	scale_comm->predict[0][1][1] = vp9_convolve8_avg_vert;
michael@0	112	scale_comm->predict[1][0][0] = vp9_convolve8_horiz;
michael@0	113	scale_comm->predict[1][0][1] = vp9_convolve8_avg_horiz;
michael@0	114	} else {
michael@0	115	// No scaling in x direction. Must always scale in the y direction.
michael@0	116	scale_comm->predict[0][0][0] = vp9_convolve8_vert;
michael@0	117	scale_comm->predict[0][0][1] = vp9_convolve8_avg_vert;
michael@0	118	scale_comm->predict[0][1][0] = vp9_convolve8_vert;
michael@0	119	scale_comm->predict[0][1][1] = vp9_convolve8_avg_vert;
michael@0	120	scale_comm->predict[1][0][0] = vp9_convolve8;
michael@0	121	scale_comm->predict[1][0][1] = vp9_convolve8_avg;
michael@0	122	}
michael@0	123	} else {
michael@0	124	if (scale_comm->y_step_q4 == 16) {
michael@0	125	// No scaling in the y direction. Must always scale in the x direction.
michael@0	126	scale_comm->predict[0][0][0] = vp9_convolve8_horiz;
michael@0	127	scale_comm->predict[0][0][1] = vp9_convolve8_avg_horiz;
michael@0	128	scale_comm->predict[0][1][0] = vp9_convolve8;
michael@0	129	scale_comm->predict[0][1][1] = vp9_convolve8_avg;
michael@0	130	scale_comm->predict[1][0][0] = vp9_convolve8_horiz;
michael@0	131	scale_comm->predict[1][0][1] = vp9_convolve8_avg_horiz;
michael@0	132	} else {
michael@0	133	// Must always scale in both directions.
michael@0	134	scale_comm->predict[0][0][0] = vp9_convolve8;
michael@0	135	scale_comm->predict[0][0][1] = vp9_convolve8_avg;
michael@0	136	scale_comm->predict[0][1][0] = vp9_convolve8;
michael@0	137	scale_comm->predict[0][1][1] = vp9_convolve8_avg;
michael@0	138	scale_comm->predict[1][0][0] = vp9_convolve8;
michael@0	139	scale_comm->predict[1][0][1] = vp9_convolve8_avg;
michael@0	140	}
michael@0	141	}
michael@0	142	// 2D subpel motion always gets filtered in both directions
michael@0	143	scale_comm->predict[1][1][0] = vp9_convolve8;
michael@0	144	scale_comm->predict[1][1][1] = vp9_convolve8_avg;
michael@0	145
michael@0	146	scale->sfc = scale_comm;
michael@0	147	scale->x_offset_q4 = 0; // calculated per block
michael@0	148	scale->y_offset_q4 = 0; // calculated per block
michael@0	149	}