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ffmpeg / libavcodec / svq1enc.c @ 2912e87a

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/*
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 * SVQ1 Encoder
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 * Copyright (C) 2004 Mike Melanson <melanson@pcisys.net>
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 *
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 * This file is part of Libav.
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 *
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 * Libav 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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 * Libav 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 Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file
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 * Sorenson Vector Quantizer #1 (SVQ1) video codec.
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 * For more information of the SVQ1 algorithm, visit:
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 *   http://www.pcisys.net/~melanson/codecs/
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 */
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#include "avcodec.h"
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#include "dsputil.h"
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#include "mpegvideo.h"
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#include "h263.h"
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#include "internal.h"
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#include "svq1.h"
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#include "svq1enc_cb.h"
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#undef NDEBUG
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#include <assert.h>
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typedef struct SVQ1Context {
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    MpegEncContext m; // needed for motion estimation, should not be used for anything else, the idea is to make the motion estimation eventually independent of MpegEncContext, so this will be removed then (FIXME/XXX)
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    AVCodecContext *avctx;
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    DSPContext dsp;
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    AVFrame picture;
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    AVFrame current_picture;
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    AVFrame last_picture;
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    PutBitContext pb;
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    GetBitContext gb;
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    PutBitContext reorder_pb[6]; //why ooh why this sick breadth first order, everything is slower and more complex
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    int frame_width;
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    int frame_height;
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    /* Y plane block dimensions */
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    int y_block_width;
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    int y_block_height;
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    /* U & V plane (C planes) block dimensions */
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    int c_block_width;
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    int c_block_height;
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    uint16_t *mb_type;
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    uint32_t *dummy;
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    int16_t (*motion_val8[3])[2];
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    int16_t (*motion_val16[3])[2];
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    int64_t rd_total;
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    uint8_t *scratchbuf;
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} SVQ1Context;
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static void svq1_write_header(SVQ1Context *s, int frame_type)
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{
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    int i;
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    /* frame code */
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    put_bits(&s->pb, 22, 0x20);
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    /* temporal reference (sure hope this is a "don't care") */
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    put_bits(&s->pb, 8, 0x00);
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    /* frame type */
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    put_bits(&s->pb, 2, frame_type - 1);
88

    
89
    if (frame_type == FF_I_TYPE) {
90

    
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        /* no checksum since frame code is 0x20 */
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        /* no embedded string either */
94

    
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        /* output 5 unknown bits (2 + 2 + 1) */
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        put_bits(&s->pb, 5, 2); /* 2 needed by quicktime decoder */
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        i= ff_match_2uint16(ff_svq1_frame_size_table, FF_ARRAY_ELEMS(ff_svq1_frame_size_table), s->frame_width, s->frame_height);
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        put_bits(&s->pb, 3, i);
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101
        if (i == 7)
102
        {
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                put_bits(&s->pb, 12, s->frame_width);
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                put_bits(&s->pb, 12, s->frame_height);
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        }
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    }
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    /* no checksum or extra data (next 2 bits get 0) */
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    put_bits(&s->pb, 2, 0);
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}
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112

    
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#define QUALITY_THRESHOLD 100
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#define THRESHOLD_MULTIPLIER 0.6
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#if HAVE_ALTIVEC
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#undef vector
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#endif
119

    
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static int encode_block(SVQ1Context *s, uint8_t *src, uint8_t *ref, uint8_t *decoded, int stride, int level, int threshold, int lambda, int intra){
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    int count, y, x, i, j, split, best_mean, best_score, best_count;
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    int best_vector[6];
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    int block_sum[7]= {0, 0, 0, 0, 0, 0};
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    int w= 2<<((level+2)>>1);
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    int h= 2<<((level+1)>>1);
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    int size=w*h;
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    int16_t block[7][256];
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    const int8_t *codebook_sum, *codebook;
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    const uint16_t (*mean_vlc)[2];
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    const uint8_t (*multistage_vlc)[2];
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    best_score=0;
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    //FIXME optimize, this doenst need to be done multiple times
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    if(intra){
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        codebook_sum= svq1_intra_codebook_sum[level];
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        codebook= ff_svq1_intra_codebooks[level];
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        mean_vlc= ff_svq1_intra_mean_vlc;
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        multistage_vlc= ff_svq1_intra_multistage_vlc[level];
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        for(y=0; y<h; y++){
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            for(x=0; x<w; x++){
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                int v= src[x + y*stride];
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                block[0][x + w*y]= v;
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                best_score += v*v;
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                block_sum[0] += v;
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            }
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        }
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    }else{
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        codebook_sum= svq1_inter_codebook_sum[level];
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        codebook= ff_svq1_inter_codebooks[level];
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        mean_vlc= ff_svq1_inter_mean_vlc + 256;
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        multistage_vlc= ff_svq1_inter_multistage_vlc[level];
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        for(y=0; y<h; y++){
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            for(x=0; x<w; x++){
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                int v= src[x + y*stride] - ref[x + y*stride];
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                block[0][x + w*y]= v;
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                best_score += v*v;
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                block_sum[0] += v;
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            }
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        }
160
    }
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    best_count=0;
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    best_score -= ((block_sum[0]*block_sum[0])>>(level+3));
164
    best_mean= (block_sum[0] + (size>>1)) >> (level+3);
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166
    if(level<4){
167
        for(count=1; count<7; count++){
168
            int best_vector_score= INT_MAX;
169
            int best_vector_sum=-999, best_vector_mean=-999;
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            const int stage= count-1;
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            const int8_t *vector;
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173
            for(i=0; i<16; i++){
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                int sum= codebook_sum[stage*16 + i];
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                int sqr, diff, score;
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177
                vector = codebook + stage*size*16 + i*size;
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                sqr = s->dsp.ssd_int8_vs_int16(vector, block[stage], size);
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                diff= block_sum[stage] - sum;
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                score= sqr - ((diff*(int64_t)diff)>>(level+3)); //FIXME 64bit slooow
181
                if(score < best_vector_score){
182
                    int mean= (diff + (size>>1)) >> (level+3);
183
                    assert(mean >-300 && mean<300);
184
                    mean= av_clip(mean, intra?0:-256, 255);
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                    best_vector_score= score;
186
                    best_vector[stage]= i;
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                    best_vector_sum= sum;
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                    best_vector_mean= mean;
189
                }
190
            }
191
            assert(best_vector_mean != -999);
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            vector= codebook + stage*size*16 + best_vector[stage]*size;
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            for(j=0; j<size; j++){
194
                block[stage+1][j] = block[stage][j] - vector[j];
195
            }
196
            block_sum[stage+1]= block_sum[stage] - best_vector_sum;
197
            best_vector_score +=
198
                lambda*(+ 1 + 4*count
199
                        + multistage_vlc[1+count][1]
200
                        + mean_vlc[best_vector_mean][1]);
201

    
202
            if(best_vector_score < best_score){
203
                best_score= best_vector_score;
204
                best_count= count;
205
                best_mean= best_vector_mean;
206
            }
207
        }
208
    }
209

    
210
    split=0;
211
    if(best_score > threshold && level){
212
        int score=0;
213
        int offset= (level&1) ? stride*h/2 : w/2;
214
        PutBitContext backup[6];
215

    
216
        for(i=level-1; i>=0; i--){
217
            backup[i]= s->reorder_pb[i];
218
        }
219
        score += encode_block(s, src         , ref         , decoded         , stride, level-1, threshold>>1, lambda, intra);
220
        score += encode_block(s, src + offset, ref + offset, decoded + offset, stride, level-1, threshold>>1, lambda, intra);
221
        score += lambda;
222

    
223
        if(score < best_score){
224
            best_score= score;
225
            split=1;
226
        }else{
227
            for(i=level-1; i>=0; i--){
228
                s->reorder_pb[i]= backup[i];
229
            }
230
        }
231
    }
232
    if (level > 0)
233
        put_bits(&s->reorder_pb[level], 1, split);
234

    
235
    if(!split){
236
        assert((best_mean >= 0 && best_mean<256) || !intra);
237
        assert(best_mean >= -256 && best_mean<256);
238
        assert(best_count >=0 && best_count<7);
239
        assert(level<4 || best_count==0);
240

    
241
        /* output the encoding */
242
        put_bits(&s->reorder_pb[level],
243
            multistage_vlc[1 + best_count][1],
244
            multistage_vlc[1 + best_count][0]);
245
        put_bits(&s->reorder_pb[level], mean_vlc[best_mean][1],
246
            mean_vlc[best_mean][0]);
247

    
248
        for (i = 0; i < best_count; i++){
249
            assert(best_vector[i]>=0 && best_vector[i]<16);
250
            put_bits(&s->reorder_pb[level], 4, best_vector[i]);
251
        }
252

    
253
        for(y=0; y<h; y++){
254
            for(x=0; x<w; x++){
255
                decoded[x + y*stride]= src[x + y*stride] - block[best_count][x + w*y] + best_mean;
256
            }
257
        }
258
    }
259

    
260
    return best_score;
261
}
262

    
263

    
264
static int svq1_encode_plane(SVQ1Context *s, int plane, unsigned char *src_plane, unsigned char *ref_plane, unsigned char *decoded_plane,
265
    int width, int height, int src_stride, int stride)
266
{
267
    int x, y;
268
    int i;
269
    int block_width, block_height;
270
    int level;
271
    int threshold[6];
272
    uint8_t *src = s->scratchbuf + stride * 16;
273
    const int lambda= (s->picture.quality*s->picture.quality) >> (2*FF_LAMBDA_SHIFT);
274

    
275
    /* figure out the acceptable level thresholds in advance */
276
    threshold[5] = QUALITY_THRESHOLD;
277
    for (level = 4; level >= 0; level--)
278
        threshold[level] = threshold[level + 1] * THRESHOLD_MULTIPLIER;
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280
    block_width = (width + 15) / 16;
281
    block_height = (height + 15) / 16;
282

    
283
    if(s->picture.pict_type == FF_P_TYPE){
284
        s->m.avctx= s->avctx;
285
        s->m.current_picture_ptr= &s->m.current_picture;
286
        s->m.last_picture_ptr   = &s->m.last_picture;
287
        s->m.last_picture.data[0]= ref_plane;
288
        s->m.linesize=
289
        s->m.last_picture.linesize[0]=
290
        s->m.new_picture.linesize[0]=
291
        s->m.current_picture.linesize[0]= stride;
292
        s->m.width= width;
293
        s->m.height= height;
294
        s->m.mb_width= block_width;
295
        s->m.mb_height= block_height;
296
        s->m.mb_stride= s->m.mb_width+1;
297
        s->m.b8_stride= 2*s->m.mb_width+1;
298
        s->m.f_code=1;
299
        s->m.pict_type= s->picture.pict_type;
300
        s->m.me_method= s->avctx->me_method;
301
        s->m.me.scene_change_score=0;
302
        s->m.flags= s->avctx->flags;
303
//        s->m.out_format = FMT_H263;
304
//        s->m.unrestricted_mv= 1;
305

    
306
        s->m.lambda= s->picture.quality;
307
        s->m.qscale= (s->m.lambda*139 + FF_LAMBDA_SCALE*64) >> (FF_LAMBDA_SHIFT + 7);
308
        s->m.lambda2= (s->m.lambda*s->m.lambda + FF_LAMBDA_SCALE/2) >> FF_LAMBDA_SHIFT;
309

    
310
        if(!s->motion_val8[plane]){
311
            s->motion_val8 [plane]= av_mallocz((s->m.b8_stride*block_height*2 + 2)*2*sizeof(int16_t));
312
            s->motion_val16[plane]= av_mallocz((s->m.mb_stride*(block_height + 2) + 1)*2*sizeof(int16_t));
313
        }
314

    
315
        s->m.mb_type= s->mb_type;
316

    
317
        //dummies, to avoid segfaults
318
        s->m.current_picture.mb_mean=   (uint8_t *)s->dummy;
319
        s->m.current_picture.mb_var=    (uint16_t*)s->dummy;
320
        s->m.current_picture.mc_mb_var= (uint16_t*)s->dummy;
321
        s->m.current_picture.mb_type= s->dummy;
322

    
323
        s->m.current_picture.motion_val[0]= s->motion_val8[plane] + 2;
324
        s->m.p_mv_table= s->motion_val16[plane] + s->m.mb_stride + 1;
325
        s->m.dsp= s->dsp; //move
326
        ff_init_me(&s->m);
327

    
328
        s->m.me.dia_size= s->avctx->dia_size;
329
        s->m.first_slice_line=1;
330
        for (y = 0; y < block_height; y++) {
331
            s->m.new_picture.data[0]= src - y*16*stride; //ugly
332
            s->m.mb_y= y;
333

    
334
            for(i=0; i<16 && i + 16*y<height; i++){
335
                memcpy(&src[i*stride], &src_plane[(i+16*y)*src_stride], width);
336
                for(x=width; x<16*block_width; x++)
337
                    src[i*stride+x]= src[i*stride+x-1];
338
            }
339
            for(; i<16 && i + 16*y<16*block_height; i++)
340
                memcpy(&src[i*stride], &src[(i-1)*stride], 16*block_width);
341

    
342
            for (x = 0; x < block_width; x++) {
343
                s->m.mb_x= x;
344
                ff_init_block_index(&s->m);
345
                ff_update_block_index(&s->m);
346

    
347
                ff_estimate_p_frame_motion(&s->m, x, y);
348
            }
349
            s->m.first_slice_line=0;
350
        }
351

    
352
        ff_fix_long_p_mvs(&s->m);
353
        ff_fix_long_mvs(&s->m, NULL, 0, s->m.p_mv_table, s->m.f_code, CANDIDATE_MB_TYPE_INTER, 0);
354
    }
355

    
356
    s->m.first_slice_line=1;
357
    for (y = 0; y < block_height; y++) {
358
        for(i=0; i<16 && i + 16*y<height; i++){
359
            memcpy(&src[i*stride], &src_plane[(i+16*y)*src_stride], width);
360
            for(x=width; x<16*block_width; x++)
361
                src[i*stride+x]= src[i*stride+x-1];
362
        }
363
        for(; i<16 && i + 16*y<16*block_height; i++)
364
            memcpy(&src[i*stride], &src[(i-1)*stride], 16*block_width);
365

    
366
        s->m.mb_y= y;
367
        for (x = 0; x < block_width; x++) {
368
            uint8_t reorder_buffer[3][6][7*32];
369
            int count[3][6];
370
            int offset = y * 16 * stride + x * 16;
371
            uint8_t *decoded= decoded_plane + offset;
372
            uint8_t *ref= ref_plane + offset;
373
            int score[4]={0,0,0,0}, best;
374
            uint8_t *temp = s->scratchbuf;
375

    
376
            if(s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb)>>3) < 3000){ //FIXME check size
377
                av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
378
                return -1;
379
            }
380

    
381
            s->m.mb_x= x;
382
            ff_init_block_index(&s->m);
383
            ff_update_block_index(&s->m);
384

    
385
            if(s->picture.pict_type == FF_I_TYPE || (s->m.mb_type[x + y*s->m.mb_stride]&CANDIDATE_MB_TYPE_INTRA)){
386
                for(i=0; i<6; i++){
387
                    init_put_bits(&s->reorder_pb[i], reorder_buffer[0][i], 7*32);
388
                }
389
                if(s->picture.pict_type == FF_P_TYPE){
390
                    const uint8_t *vlc= ff_svq1_block_type_vlc[SVQ1_BLOCK_INTRA];
391
                    put_bits(&s->reorder_pb[5], vlc[1], vlc[0]);
392
                    score[0]= vlc[1]*lambda;
393
                }
394
                score[0]+= encode_block(s, src+16*x, NULL, temp, stride, 5, 64, lambda, 1);
395
                for(i=0; i<6; i++){
396
                    count[0][i]= put_bits_count(&s->reorder_pb[i]);
397
                    flush_put_bits(&s->reorder_pb[i]);
398
                }
399
            }else
400
                score[0]= INT_MAX;
401

    
402
            best=0;
403

    
404
            if(s->picture.pict_type == FF_P_TYPE){
405
                const uint8_t *vlc= ff_svq1_block_type_vlc[SVQ1_BLOCK_INTER];
406
                int mx, my, pred_x, pred_y, dxy;
407
                int16_t *motion_ptr;
408

    
409
                motion_ptr= h263_pred_motion(&s->m, 0, 0, &pred_x, &pred_y);
410
                if(s->m.mb_type[x + y*s->m.mb_stride]&CANDIDATE_MB_TYPE_INTER){
411
                    for(i=0; i<6; i++)
412
                        init_put_bits(&s->reorder_pb[i], reorder_buffer[1][i], 7*32);
413

    
414
                    put_bits(&s->reorder_pb[5], vlc[1], vlc[0]);
415

    
416
                    s->m.pb= s->reorder_pb[5];
417
                    mx= motion_ptr[0];
418
                    my= motion_ptr[1];
419
                    assert(mx>=-32 && mx<=31);
420
                    assert(my>=-32 && my<=31);
421
                    assert(pred_x>=-32 && pred_x<=31);
422
                    assert(pred_y>=-32 && pred_y<=31);
423
                    ff_h263_encode_motion(&s->m, mx - pred_x, 1);
424
                    ff_h263_encode_motion(&s->m, my - pred_y, 1);
425
                    s->reorder_pb[5]= s->m.pb;
426
                    score[1] += lambda*put_bits_count(&s->reorder_pb[5]);
427

    
428
                    dxy= (mx&1) + 2*(my&1);
429

    
430
                    s->dsp.put_pixels_tab[0][dxy](temp+16, ref + (mx>>1) + stride*(my>>1), stride, 16);
431

    
432
                    score[1]+= encode_block(s, src+16*x, temp+16, decoded, stride, 5, 64, lambda, 0);
433
                    best= score[1] <= score[0];
434

    
435
                    vlc= ff_svq1_block_type_vlc[SVQ1_BLOCK_SKIP];
436
                    score[2]= s->dsp.sse[0](NULL, src+16*x, ref, stride, 16);
437
                    score[2]+= vlc[1]*lambda;
438
                    if(score[2] < score[best] && mx==0 && my==0){
439
                        best=2;
440
                        s->dsp.put_pixels_tab[0][0](decoded, ref, stride, 16);
441
                        for(i=0; i<6; i++){
442
                            count[2][i]=0;
443
                        }
444
                        put_bits(&s->pb, vlc[1], vlc[0]);
445
                    }
446
                }
447

    
448
                if(best==1){
449
                    for(i=0; i<6; i++){
450
                        count[1][i]= put_bits_count(&s->reorder_pb[i]);
451
                        flush_put_bits(&s->reorder_pb[i]);
452
                    }
453
                }else{
454
                    motion_ptr[0                 ] = motion_ptr[1                 ]=
455
                    motion_ptr[2                 ] = motion_ptr[3                 ]=
456
                    motion_ptr[0+2*s->m.b8_stride] = motion_ptr[1+2*s->m.b8_stride]=
457
                    motion_ptr[2+2*s->m.b8_stride] = motion_ptr[3+2*s->m.b8_stride]=0;
458
                }
459
            }
460

    
461
            s->rd_total += score[best];
462

    
463
            for(i=5; i>=0; i--){
464
                ff_copy_bits(&s->pb, reorder_buffer[best][i], count[best][i]);
465
            }
466
            if(best==0){
467
                s->dsp.put_pixels_tab[0][0](decoded, temp, stride, 16);
468
            }
469
        }
470
        s->m.first_slice_line=0;
471
    }
472
    return 0;
473
}
474

    
475
static av_cold int svq1_encode_init(AVCodecContext *avctx)
476
{
477
    SVQ1Context * const s = avctx->priv_data;
478

    
479
    dsputil_init(&s->dsp, avctx);
480
    avctx->coded_frame= (AVFrame*)&s->picture;
481

    
482
    s->frame_width = avctx->width;
483
    s->frame_height = avctx->height;
484

    
485
    s->y_block_width = (s->frame_width + 15) / 16;
486
    s->y_block_height = (s->frame_height + 15) / 16;
487

    
488
    s->c_block_width = (s->frame_width / 4 + 15) / 16;
489
    s->c_block_height = (s->frame_height / 4 + 15) / 16;
490

    
491
    s->avctx= avctx;
492
    s->m.avctx= avctx;
493
    s->m.me.temp      =
494
    s->m.me.scratchpad= av_mallocz((avctx->width+64)*2*16*2*sizeof(uint8_t));
495
    s->m.me.map       = av_mallocz(ME_MAP_SIZE*sizeof(uint32_t));
496
    s->m.me.score_map = av_mallocz(ME_MAP_SIZE*sizeof(uint32_t));
497
    s->mb_type        = av_mallocz((s->y_block_width+1)*s->y_block_height*sizeof(int16_t));
498
    s->dummy          = av_mallocz((s->y_block_width+1)*s->y_block_height*sizeof(int32_t));
499
    h263_encode_init(&s->m); //mv_penalty
500

    
501
    return 0;
502
}
503

    
504
static int svq1_encode_frame(AVCodecContext *avctx, unsigned char *buf,
505
    int buf_size, void *data)
506
{
507
    SVQ1Context * const s = avctx->priv_data;
508
    AVFrame *pict = data;
509
    AVFrame * const p= (AVFrame*)&s->picture;
510
    AVFrame temp;
511
    int i;
512

    
513
    if(avctx->pix_fmt != PIX_FMT_YUV410P){
514
        av_log(avctx, AV_LOG_ERROR, "unsupported pixel format\n");
515
        return -1;
516
    }
517

    
518
    if(!s->current_picture.data[0]){
519
        avctx->get_buffer(avctx, &s->current_picture);
520
        avctx->get_buffer(avctx, &s->last_picture);
521
        s->scratchbuf = av_malloc(s->current_picture.linesize[0] * 16 * 2);
522
    }
523

    
524
    temp= s->current_picture;
525
    s->current_picture= s->last_picture;
526
    s->last_picture= temp;
527

    
528
    init_put_bits(&s->pb, buf, buf_size);
529

    
530
    *p = *pict;
531
    p->pict_type = avctx->gop_size && avctx->frame_number % avctx->gop_size ? FF_P_TYPE : FF_I_TYPE;
532
    p->key_frame = p->pict_type == FF_I_TYPE;
533

    
534
    svq1_write_header(s, p->pict_type);
535
    for(i=0; i<3; i++){
536
        if(svq1_encode_plane(s, i,
537
            s->picture.data[i], s->last_picture.data[i], s->current_picture.data[i],
538
            s->frame_width / (i?4:1), s->frame_height / (i?4:1),
539
            s->picture.linesize[i], s->current_picture.linesize[i]) < 0)
540
                return -1;
541
    }
542

    
543
//    align_put_bits(&s->pb);
544
    while(put_bits_count(&s->pb) & 31)
545
        put_bits(&s->pb, 1, 0);
546

    
547
    flush_put_bits(&s->pb);
548

    
549
    return put_bits_count(&s->pb) / 8;
550
}
551

    
552
static av_cold int svq1_encode_end(AVCodecContext *avctx)
553
{
554
    SVQ1Context * const s = avctx->priv_data;
555
    int i;
556

    
557
    av_log(avctx, AV_LOG_DEBUG, "RD: %f\n", s->rd_total/(double)(avctx->width*avctx->height*avctx->frame_number));
558

    
559
    av_freep(&s->m.me.scratchpad);
560
    av_freep(&s->m.me.map);
561
    av_freep(&s->m.me.score_map);
562
    av_freep(&s->mb_type);
563
    av_freep(&s->dummy);
564
    av_freep(&s->scratchbuf);
565

    
566
    for(i=0; i<3; i++){
567
        av_freep(&s->motion_val8[i]);
568
        av_freep(&s->motion_val16[i]);
569
    }
570

    
571
    return 0;
572
}
573

    
574

    
575
AVCodec ff_svq1_encoder = {
576
    "svq1",
577
    AVMEDIA_TYPE_VIDEO,
578
    CODEC_ID_SVQ1,
579
    sizeof(SVQ1Context),
580
    svq1_encode_init,
581
    svq1_encode_frame,
582
    svq1_encode_end,
583
    .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV410P, PIX_FMT_NONE},
584
    .long_name= NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 1 / Sorenson Video 1 / SVQ1"),
585
};