Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / zmbvenc.c
CommitLineData
2ba45a60
DM
1/*
2 * Zip Motion Blocks Video (ZMBV) encoder
3 * Copyright (c) 2006 Konstantin Shishkov
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22/**
23 * @file
24 * Zip Motion Blocks Video encoder
25 */
26
27#include <stdio.h>
28#include <stdlib.h>
29
30#include "libavutil/common.h"
31#include "libavutil/intreadwrite.h"
32#include "avcodec.h"
33#include "internal.h"
34
35#include <zlib.h>
36
37#define ZMBV_KEYFRAME 1
38#define ZMBV_DELTAPAL 2
39
40#define ZMBV_BLOCK 16
41
42/**
43 * Encoder context
44 */
45typedef struct ZmbvEncContext {
46 AVCodecContext *avctx;
47
48 int range;
49 uint8_t *comp_buf, *work_buf;
50 uint8_t pal[768];
51 uint32_t pal2[256]; //for quick comparisons
52 uint8_t *prev;
53 int pstride;
54 int comp_size;
55 int keyint, curfrm;
56 z_stream zstream;
57} ZmbvEncContext;
58
59static int score_tab[256];
60
61/** Block comparing function
62 * XXX should be optimized and moved to DSPContext
63 * TODO handle out of edge ME
64 */
65static inline int block_cmp(uint8_t *src, int stride, uint8_t *src2, int stride2,
66 int bw, int bh, int *xored)
67{
68 int sum = 0;
69 int i, j;
70 uint8_t histogram[256] = {0};
71
72 *xored = 0;
73 for(j = 0; j < bh; j++){
74 for(i = 0; i < bw; i++){
75 int t = src[i] ^ src2[i];
76 histogram[t]++;
77 *xored |= t;
78 }
79 src += stride;
80 src2 += stride2;
81 }
82
83 for(i = 1; i < 256; i++)
84 sum += score_tab[histogram[i]];
85
86 return sum;
87}
88
89/** Motion estimation function
90 * TODO make better ME decisions
91 */
92static int zmbv_me(ZmbvEncContext *c, uint8_t *src, int sstride, uint8_t *prev,
93 int pstride, int x, int y, int *mx, int *my, int *xored)
94{
95 int dx, dy, tx, ty, tv, bv, bw, bh;
96
97 *mx = *my = 0;
98 bw = FFMIN(ZMBV_BLOCK, c->avctx->width - x);
99 bh = FFMIN(ZMBV_BLOCK, c->avctx->height - y);
100 bv = block_cmp(src, sstride, prev, pstride, bw, bh, xored);
101 if(!bv) return 0;
102 for(ty = FFMAX(y - c->range, 0); ty < FFMIN(y + c->range, c->avctx->height - bh); ty++){
103 for(tx = FFMAX(x - c->range, 0); tx < FFMIN(x + c->range, c->avctx->width - bw); tx++){
104 if(tx == x && ty == y) continue; // we already tested this block
105 dx = tx - x;
106 dy = ty - y;
107 tv = block_cmp(src, sstride, prev + dx + dy*pstride, pstride, bw, bh, xored);
108 if(tv < bv){
109 bv = tv;
110 *mx = dx;
111 *my = dy;
112 if(!bv) return 0;
113 }
114 }
115 }
116 return bv;
117}
118
119static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
120 const AVFrame *pict, int *got_packet)
121{
122 ZmbvEncContext * const c = avctx->priv_data;
123 const AVFrame * const p = pict;
124 uint8_t *src, *prev, *buf;
125 uint32_t *palptr;
126 int keyframe, chpal;
127 int fl;
128 int work_size = 0, pkt_size;
129 int bw, bh;
130 int i, j, ret;
131
132 keyframe = !c->curfrm;
133 c->curfrm++;
134 if(c->curfrm == c->keyint)
135 c->curfrm = 0;
136 avctx->coded_frame->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
137 avctx->coded_frame->key_frame = keyframe;
138 chpal = !keyframe && memcmp(p->data[1], c->pal2, 1024);
139
140 palptr = (uint32_t*)p->data[1];
141 src = p->data[0];
142 prev = c->prev;
143 if(chpal){
144 uint8_t tpal[3];
145 for(i = 0; i < 256; i++){
146 AV_WB24(tpal, palptr[i]);
147 c->work_buf[work_size++] = tpal[0] ^ c->pal[i * 3 + 0];
148 c->work_buf[work_size++] = tpal[1] ^ c->pal[i * 3 + 1];
149 c->work_buf[work_size++] = tpal[2] ^ c->pal[i * 3 + 2];
150 c->pal[i * 3 + 0] = tpal[0];
151 c->pal[i * 3 + 1] = tpal[1];
152 c->pal[i * 3 + 2] = tpal[2];
153 }
154 memcpy(c->pal2, p->data[1], 1024);
155 }
156 if(keyframe){
157 for(i = 0; i < 256; i++){
158 AV_WB24(c->pal+(i*3), palptr[i]);
159 }
160 memcpy(c->work_buf, c->pal, 768);
161 memcpy(c->pal2, p->data[1], 1024);
162 work_size = 768;
163 for(i = 0; i < avctx->height; i++){
164 memcpy(c->work_buf + work_size, src, avctx->width);
165 src += p->linesize[0];
166 work_size += avctx->width;
167 }
168 }else{
169 int x, y, bh2, bw2, xored;
170 uint8_t *tsrc, *tprev;
171 uint8_t *mv;
172 int mx, my;
173
174 bw = (avctx->width + ZMBV_BLOCK - 1) / ZMBV_BLOCK;
175 bh = (avctx->height + ZMBV_BLOCK - 1) / ZMBV_BLOCK;
176 mv = c->work_buf + work_size;
177 memset(c->work_buf + work_size, 0, (bw * bh * 2 + 3) & ~3);
178 work_size += (bw * bh * 2 + 3) & ~3;
179 /* for now just XOR'ing */
180 for(y = 0; y < avctx->height; y += ZMBV_BLOCK) {
181 bh2 = FFMIN(avctx->height - y, ZMBV_BLOCK);
182 for(x = 0; x < avctx->width; x += ZMBV_BLOCK, mv += 2) {
183 bw2 = FFMIN(avctx->width - x, ZMBV_BLOCK);
184
185 tsrc = src + x;
186 tprev = prev + x;
187
188 zmbv_me(c, tsrc, p->linesize[0], tprev, c->pstride, x, y, &mx, &my, &xored);
189 mv[0] = (mx << 1) | !!xored;
190 mv[1] = my << 1;
191 tprev += mx + my * c->pstride;
192 if(xored){
193 for(j = 0; j < bh2; j++){
194 for(i = 0; i < bw2; i++)
195 c->work_buf[work_size++] = tsrc[i] ^ tprev[i];
196 tsrc += p->linesize[0];
197 tprev += c->pstride;
198 }
199 }
200 }
201 src += p->linesize[0] * ZMBV_BLOCK;
202 prev += c->pstride * ZMBV_BLOCK;
203 }
204 }
205 /* save the previous frame */
206 src = p->data[0];
207 prev = c->prev;
208 for(i = 0; i < avctx->height; i++){
209 memcpy(prev, src, avctx->width);
210 prev += c->pstride;
211 src += p->linesize[0];
212 }
213
214 if (keyframe)
215 deflateReset(&c->zstream);
216
217 c->zstream.next_in = c->work_buf;
218 c->zstream.avail_in = work_size;
219 c->zstream.total_in = 0;
220
221 c->zstream.next_out = c->comp_buf;
222 c->zstream.avail_out = c->comp_size;
223 c->zstream.total_out = 0;
224 if(deflate(&c->zstream, Z_SYNC_FLUSH) != Z_OK){
225 av_log(avctx, AV_LOG_ERROR, "Error compressing data\n");
226 return -1;
227 }
228
229 pkt_size = c->zstream.total_out + 1 + 6*keyframe;
230 if ((ret = ff_alloc_packet2(avctx, pkt, pkt_size)) < 0)
231 return ret;
232 buf = pkt->data;
233
234 fl = (keyframe ? ZMBV_KEYFRAME : 0) | (chpal ? ZMBV_DELTAPAL : 0);
235 *buf++ = fl;
236 if (keyframe) {
237 *buf++ = 0; // hi ver
238 *buf++ = 1; // lo ver
239 *buf++ = 1; // comp
240 *buf++ = 4; // format - 8bpp
241 *buf++ = ZMBV_BLOCK; // block width
242 *buf++ = ZMBV_BLOCK; // block height
243 }
244 memcpy(buf, c->comp_buf, c->zstream.total_out);
245
246 pkt->flags |= AV_PKT_FLAG_KEY*keyframe;
247 *got_packet = 1;
248
249 return 0;
250}
251
252static av_cold int encode_end(AVCodecContext *avctx)
253{
254 ZmbvEncContext * const c = avctx->priv_data;
255
256 av_freep(&c->comp_buf);
257 av_freep(&c->work_buf);
258
259 deflateEnd(&c->zstream);
260 av_freep(&c->prev);
261
262 av_frame_free(&avctx->coded_frame);
263
264 return 0;
265}
266
267/**
268 * Init zmbv encoder
269 */
270static av_cold int encode_init(AVCodecContext *avctx)
271{
272 ZmbvEncContext * const c = avctx->priv_data;
273 int zret; // Zlib return code
274 int i;
275 int lvl = 9;
276
277 for(i=1; i<256; i++)
278 score_tab[i]= -i * log(i/(double)(ZMBV_BLOCK*ZMBV_BLOCK)) * (256/M_LN2);
279
280 c->avctx = avctx;
281
282 c->curfrm = 0;
283 c->keyint = avctx->keyint_min;
284 c->range = 8;
285 if(avctx->me_range > 0)
286 c->range = FFMIN(avctx->me_range, 127);
287
288 if(avctx->compression_level >= 0)
289 lvl = avctx->compression_level;
290 if(lvl < 0 || lvl > 9){
291 av_log(avctx, AV_LOG_ERROR, "Compression level should be 0-9, not %i\n", lvl);
292 return AVERROR(EINVAL);
293 }
294
295 // Needed if zlib unused or init aborted before deflateInit
296 memset(&c->zstream, 0, sizeof(z_stream));
297 c->comp_size = avctx->width * avctx->height + 1024 +
298 ((avctx->width + ZMBV_BLOCK - 1) / ZMBV_BLOCK) * ((avctx->height + ZMBV_BLOCK - 1) / ZMBV_BLOCK) * 2 + 4;
299 if (!(c->work_buf = av_malloc(c->comp_size))) {
300 av_log(avctx, AV_LOG_ERROR, "Can't allocate work buffer.\n");
301 return AVERROR(ENOMEM);
302 }
303 /* Conservative upper bound taken from zlib v1.2.1 source via lcl.c */
304 c->comp_size = c->comp_size + ((c->comp_size + 7) >> 3) +
305 ((c->comp_size + 63) >> 6) + 11;
306
307 /* Allocate compression buffer */
308 if (!(c->comp_buf = av_malloc(c->comp_size))) {
309 av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n");
310 return AVERROR(ENOMEM);
311 }
312 c->pstride = FFALIGN(avctx->width, 16);
313 if (!(c->prev = av_malloc(c->pstride * avctx->height))) {
314 av_log(avctx, AV_LOG_ERROR, "Can't allocate picture.\n");
315 return AVERROR(ENOMEM);
316 }
317
318 c->zstream.zalloc = Z_NULL;
319 c->zstream.zfree = Z_NULL;
320 c->zstream.opaque = Z_NULL;
321 zret = deflateInit(&c->zstream, lvl);
322 if (zret != Z_OK) {
323 av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
324 return -1;
325 }
326
327 avctx->coded_frame = av_frame_alloc();
328 if (!avctx->coded_frame) {
329 encode_end(avctx);
330 return AVERROR(ENOMEM);
331 }
332
333 return 0;
334}
335
336AVCodec ff_zmbv_encoder = {
337 .name = "zmbv",
338 .long_name = NULL_IF_CONFIG_SMALL("Zip Motion Blocks Video"),
339 .type = AVMEDIA_TYPE_VIDEO,
340 .id = AV_CODEC_ID_ZMBV,
341 .priv_data_size = sizeof(ZmbvEncContext),
342 .init = encode_init,
343 .encode2 = encode_frame,
344 .close = encode_end,
345 .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_PAL8, AV_PIX_FMT_NONE },
346};