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annotate libavcodec/arm/mpegvideo_armv5te.c @ 9:ea1ba68cf0ed

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update to match api changes + add sscc produced source
author Nina Engelhardt <nengel@mailbox.tu-berlin.de>
date Wed, 05 Jun 2013 14:43:26 +0200
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nengel@2 1 /*
nengel@2 2 * Optimization of some functions from mpegvideo.c for armv5te
nengel@2 3 * Copyright (c) 2007 Siarhei Siamashka <ssvb@users.sourceforge.net>
nengel@2 4 *
nengel@2 5 * This file is part of FFmpeg.
nengel@2 6 *
nengel@2 7 * FFmpeg is free software; you can redistribute it and/or
nengel@2 8 * modify it under the terms of the GNU Lesser General Public
nengel@2 9 * License as published by the Free Software Foundation; either
nengel@2 10 * version 2.1 of the License, or (at your option) any later version.
nengel@2 11 *
nengel@2 12 * FFmpeg is distributed in the hope that it will be useful,
nengel@2 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
nengel@2 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
nengel@2 15 * Lesser General Public License for more details.
nengel@2 16 *
nengel@2 17 * You should have received a copy of the GNU Lesser General Public
nengel@2 18 * License along with FFmpeg; if not, write to the Free Software
nengel@2 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
nengel@2 20 */
nengel@2 21
nengel@2 22 #include "libavcodec/avcodec.h"
nengel@2 23 #include "libavcodec/dsputil.h"
nengel@2 24 #include "libavcodec/mpegvideo.h"
nengel@2 25 #include "mpegvideo_arm.h"
nengel@2 26
nengel@2 27 void ff_dct_unquantize_h263_armv5te(DCTELEM *block, int qmul, int qadd, int count);
nengel@2 28
nengel@2 29 #ifdef ENABLE_ARM_TESTS
nengel@2 30 /**
nengel@2 31 * h263 dequantizer supplementary function, it is performance critical and needs to
nengel@2 32 * have optimized implementations for each architecture. Is also used as a reference
nengel@2 33 * implementation in regression tests
nengel@2 34 */
nengel@2 35 static inline void dct_unquantize_h263_helper_c(DCTELEM *block, int qmul, int qadd, int count)
nengel@2 36 {
nengel@2 37 int i, level;
nengel@2 38 for (i = 0; i < count; i++) {
nengel@2 39 level = block[i];
nengel@2 40 if (level) {
nengel@2 41 if (level < 0) {
nengel@2 42 level = level * qmul - qadd;
nengel@2 43 } else {
nengel@2 44 level = level * qmul + qadd;
nengel@2 45 }
nengel@2 46 block[i] = level;
nengel@2 47 }
nengel@2 48 }
nengel@2 49 }
nengel@2 50 #endif
nengel@2 51
nengel@2 52 static void dct_unquantize_h263_intra_armv5te(MpegEncContext *s,
nengel@2 53 DCTELEM *block, int n, int qscale)
nengel@2 54 {
nengel@2 55 int level, qmul, qadd;
nengel@2 56 int nCoeffs;
nengel@2 57
nengel@2 58 assert(s->block_last_index[n]>=0);
nengel@2 59
nengel@2 60 qmul = qscale << 1;
nengel@2 61
nengel@2 62 if (!s->h263_aic) {
nengel@2 63 if (n < 4)
nengel@2 64 level = block[0] * s->y_dc_scale;
nengel@2 65 else
nengel@2 66 level = block[0] * s->c_dc_scale;
nengel@2 67 qadd = (qscale - 1) | 1;
nengel@2 68 }else{
nengel@2 69 qadd = 0;
nengel@2 70 level = block[0];
nengel@2 71 }
nengel@2 72 if(s->ac_pred)
nengel@2 73 nCoeffs=63;
nengel@2 74 else
nengel@2 75 nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
nengel@2 76
nengel@2 77 ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1);
nengel@2 78 block[0] = level;
nengel@2 79 }
nengel@2 80
nengel@2 81 static void dct_unquantize_h263_inter_armv5te(MpegEncContext *s,
nengel@2 82 DCTELEM *block, int n, int qscale)
nengel@2 83 {
nengel@2 84 int qmul, qadd;
nengel@2 85 int nCoeffs;
nengel@2 86
nengel@2 87 assert(s->block_last_index[n]>=0);
nengel@2 88
nengel@2 89 qadd = (qscale - 1) | 1;
nengel@2 90 qmul = qscale << 1;
nengel@2 91
nengel@2 92 nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
nengel@2 93
nengel@2 94 ff_dct_unquantize_h263_armv5te(block, qmul, qadd, nCoeffs + 1);
nengel@2 95 }
nengel@2 96
nengel@2 97 void MPV_common_init_armv5te(MpegEncContext *s)
nengel@2 98 {
nengel@2 99 s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_armv5te;
nengel@2 100 s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_armv5te;
nengel@2 101 }