ffmpeg / libavcodec / armv4l / mpegvideo_armv5te.c @ 14c2634b
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/*


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* Optimization of some functions from mpegvideo.c for armv5te

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* Copyright (c) 2007 Siarhei Siamashka <ssvb@users.sourceforge.net>

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*

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* This file is part of FFmpeg.

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*

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* FFmpeg is free software; you can redistribute it and/or

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* modify it under the terms of the GNU Lesser General Public

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* License as published by the Free Software Foundation; either

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* version 2.1 of the License, or (at your option) any later version.

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*

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* FFmpeg is distributed in the hope that it will be useful,

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* but WITHOUT ANY WARRANTY; without even the implied warranty of

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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

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* Lesser General Public License for more details.

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*

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* You should have received a copy of the GNU Lesser General Public

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* License along with FFmpeg; if not, write to the Free Software

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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 021101301 USA

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*/

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#include "dsputil.h" 
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#include "mpegvideo.h" 
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#include "avcodec.h" 
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#ifdef ENABLE_ARM_TESTS

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/**

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* h263 dequantizer supplementary function, it is performance critical and needs to

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* have optimized implementations for each architecture. Is also used as a reference

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* implementation in regression tests

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*/

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static inline void dct_unquantize_h263_helper_c(DCTELEM *block, int qmul, int qadd, int count) 
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{ 
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int i, level;

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for (i = 0; i < count; i++) { 
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level = block[i]; 
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if (level) {

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if (level < 0) { 
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level = level * qmul  qadd; 
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} else {

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level = level * qmul + qadd; 
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} 
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block[i] = level; 
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} 
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} 
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} 
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#endif

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/* GCC 3.1 or higher is required to support symbolic names in assembly code */

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#if (__GNUC__ > 3)  ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 1)) 
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/**

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* Special optimized version of dct_unquantize_h263_helper_c, it requires the block

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* to be at least 8 bytes aligned, and may process more elements than requested.

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* But it is guaranteed to never process more than 64 elements provided that

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* xxcount argument is <= 64, so it is safe. This macro is optimized for a common

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* distribution of values for nCoeffs (they are mostly multiple of 8 plus one or

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* two extra elements). So this macro processes data as 8 elements per loop iteration

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* and contains optional 2 elements processing in the end.

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*

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* Inner loop should take 6 cycles per element on arm926ejs (Nokia 770)

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*/

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#define dct_unquantize_h263_special_helper_armv5te(xxblock, xxqmul, xxqadd, xxcount) \

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({ DCTELEM *xblock = xxblock; \ 
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int xqmul = xxqmul, xqadd = xxqadd, xcount = xxcount, xtmp; \

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int xdata1, xdata2; \

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__asm__ __volatile__( \ 
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"subs %[count], %[count], #2 \n\t" \

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"ble 2f \n\t" \

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"ldrd r4, [%[block], #0] \n\t" \

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"1: \n\t" \

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"ldrd r6, [%[block], #8] \n\t" \

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\ 
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"rsbs %[data1], %[zero], r4, asr #16 \n\t" \

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"addgt %[data1], %[qadd], #0 \n\t" \

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"rsblt %[data1], %[qadd], #0 \n\t" \

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"smlatbne %[data1], r4, %[qmul], %[data1] \n\t" \

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\ 
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"rsbs %[data2], %[zero], r5, asr #16 \n\t" \

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"addgt %[data2], %[qadd], #0 \n\t" \

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"rsblt %[data2], %[qadd], #0 \n\t" \

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"smlatbne %[data2], r5, %[qmul], %[data2] \n\t" \

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\ 
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"rsbs %[tmp], %[zero], r4, asl #16 \n\t" \

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"addgt %[tmp], %[qadd], #0 \n\t" \

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"rsblt %[tmp], %[qadd], #0 \n\t" \

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"smlabbne r4, r4, %[qmul], %[tmp] \n\t" \

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\ 
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"rsbs %[tmp], %[zero], r5, asl #16 \n\t" \

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"addgt %[tmp], %[qadd], #0 \n\t" \

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"rsblt %[tmp], %[qadd], #0 \n\t" \

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"smlabbne r5, r5, %[qmul], %[tmp] \n\t" \

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\ 
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"strh r4, [%[block]], #2 \n\t" \

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"strh %[data1], [%[block]], #2 \n\t" \

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"strh r5, [%[block]], #2 \n\t" \

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"strh %[data2], [%[block]], #2 \n\t" \

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\ 
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"rsbs %[data1], %[zero], r6, asr #16 \n\t" \

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"addgt %[data1], %[qadd], #0 \n\t" \

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"rsblt %[data1], %[qadd], #0 \n\t" \

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"smlatbne %[data1], r6, %[qmul], %[data1] \n\t" \

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\ 
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"rsbs %[data2], %[zero], r7, asr #16 \n\t" \

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"addgt %[data2], %[qadd], #0 \n\t" \

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"rsblt %[data2], %[qadd], #0 \n\t" \

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"smlatbne %[data2], r7, %[qmul], %[data2] \n\t" \

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\ 
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"rsbs %[tmp], %[zero], r6, asl #16 \n\t" \

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"addgt %[tmp], %[qadd], #0 \n\t" \

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"rsblt %[tmp], %[qadd], #0 \n\t" \

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"smlabbne r6, r6, %[qmul], %[tmp] \n\t" \

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\ 
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"rsbs %[tmp], %[zero], r7, asl #16 \n\t" \

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"addgt %[tmp], %[qadd], #0 \n\t" \

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"rsblt %[tmp], %[qadd], #0 \n\t" \

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"smlabbne r7, r7, %[qmul], %[tmp] \n\t" \

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\ 
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"strh r6, [%[block]], #2 \n\t" \

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"strh %[data1], [%[block]], #2 \n\t" \

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"strh r7, [%[block]], #2 \n\t" \

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"strh %[data2], [%[block]], #2 \n\t" \

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\ 
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"subs %[count], %[count], #8 \n\t" \

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"ldrgtd r4, [%[block], #0] \n\t" /* load data early to avoid load/use pipeline stall */ \ 
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"bgt 1b \n\t" \

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\ 
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"adds %[count], %[count], #2 \n\t" \

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"ble 3f \n\t" \

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"2: \n\t" \

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"ldrsh %[data1], [%[block], #0] \n\t" \

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"ldrsh %[data2], [%[block], #2] \n\t" \

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"mov %[tmp], %[qadd] \n\t" \

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"cmp %[data1], #0 \n\t" \

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"rsblt %[tmp], %[qadd], #0 \n\t" \

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"smlabbne %[data1], %[data1], %[qmul], %[tmp] \n\t" \

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"mov %[tmp], %[qadd] \n\t" \

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"cmp %[data2], #0 \n\t" \

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"rsblt %[tmp], %[qadd], #0 \n\t" \

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"smlabbne %[data2], %[data2], %[qmul], %[tmp] \n\t" \

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"strh %[data1], [%[block]], #2 \n\t" \

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"strh %[data2], [%[block]], #2 \n\t" \

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"3: \n\t" \

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: [block] "+&r" (xblock), [count] "+&r" (xcount), [tmp] "=&r" (xtmp), \ 
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[data1] "=&r" (xdata1), [data2] "=&r" (xdata2) \ 
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: [qmul] "r" (xqmul), [qadd] "r" (xqadd), [zero] "r" (0) \ 
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: "r4", "r5", "r6", "r7", "cc", "memory" \ 
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); \ 
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}) 
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static void dct_unquantize_h263_intra_armv5te(MpegEncContext *s, 
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DCTELEM *block, int n, int qscale) 
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{ 
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int level, qmul, qadd;

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int nCoeffs;

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assert(s>block_last_index[n]>=0);

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qmul = qscale << 1;

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if (!s>h263_aic) {

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if (n < 4) 
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level = block[0] * s>y_dc_scale;

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else

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level = block[0] * s>c_dc_scale;

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qadd = (qscale  1)  1; 
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}else{

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qadd = 0;

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level = block[0];

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} 
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if(s>ac_pred)

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nCoeffs=63;

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else

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nCoeffs= s>inter_scantable.raster_end[ s>block_last_index[n] ]; 
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dct_unquantize_h263_special_helper_armv5te(block, qmul, qadd, nCoeffs + 1);

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block[0] = level;

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} 
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static void dct_unquantize_h263_inter_armv5te(MpegEncContext *s, 
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DCTELEM *block, int n, int qscale) 
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{ 
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int qmul, qadd;

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int nCoeffs;

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assert(s>block_last_index[n]>=0);

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qadd = (qscale  1)  1; 
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qmul = qscale << 1;

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nCoeffs= s>inter_scantable.raster_end[ s>block_last_index[n] ]; 
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dct_unquantize_h263_special_helper_armv5te(block, qmul, qadd, nCoeffs + 1);

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} 
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#define HAVE_DCT_UNQUANTIZE_H263_ARMV5TE_OPTIMIZED

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#endif

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void MPV_common_init_armv5te(MpegEncContext *s)

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{ 
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#ifdef HAVE_DCT_UNQUANTIZE_H263_ARMV5TE_OPTIMIZED

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s>dct_unquantize_h263_intra = dct_unquantize_h263_intra_armv5te; 
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s>dct_unquantize_h263_inter = dct_unquantize_h263_inter_armv5te; 
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#endif

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} 