2 * Optimization of some functions from mpegvideo.c for armv5te
3 * Copyright (c) 2007 Siarhei Siamashka <ssvb@users.sourceforge.net>
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/attributes.h"
23 #include "libavutil/avassert.h"
24 #include "libavcodec/avcodec.h"
25 #include "libavcodec/mpegvideo.h"
26 #include "mpegvideo_arm.h"
28 void ff_dct_unquantize_h263_armv5te(int16_t *block
, int qmul
, int qadd
, int count
);
30 #ifdef ENABLE_ARM_TESTS
32 * h263 dequantizer supplementary function, it is performance critical and needs to
33 * have optimized implementations for each architecture. Is also used as a reference
34 * implementation in regression tests
36 static inline void dct_unquantize_h263_helper_c(int16_t *block
, int qmul
, int qadd
, int count
)
39 for (i
= 0; i
< count
; i
++) {
43 level
= level
* qmul
- qadd
;
45 level
= level
* qmul
+ qadd
;
53 static void dct_unquantize_h263_intra_armv5te(MpegEncContext
*s
,
54 int16_t *block
, int n
, int qscale
)
56 int level
, qmul
, qadd
;
59 av_assert2(s
->block_last_index
[n
]>=0);
65 level
= block
[0] * s
->y_dc_scale
;
67 level
= block
[0] * s
->c_dc_scale
;
68 qadd
= (qscale
- 1) | 1;
76 nCoeffs
= s
->inter_scantable
.raster_end
[ s
->block_last_index
[n
] ];
78 ff_dct_unquantize_h263_armv5te(block
, qmul
, qadd
, nCoeffs
+ 1);
82 static void dct_unquantize_h263_inter_armv5te(MpegEncContext
*s
,
83 int16_t *block
, int n
, int qscale
)
88 av_assert2(s
->block_last_index
[n
]>=0);
90 qadd
= (qscale
- 1) | 1;
93 nCoeffs
= s
->inter_scantable
.raster_end
[ s
->block_last_index
[n
] ];
95 ff_dct_unquantize_h263_armv5te(block
, qmul
, qadd
, nCoeffs
+ 1);
98 av_cold
void ff_mpv_common_init_armv5te(MpegEncContext
*s
)
100 s
->dct_unquantize_h263_intra
= dct_unquantize_h263_intra_armv5te
;
101 s
->dct_unquantize_h263_inter
= dct_unquantize_h263_inter_armv5te
;