2 * Zip Motion Blocks Video (ZMBV) decoder
3 * Copyright (c) 2006 Konstantin Shishkov
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
25 * Zip Motion Blocks Video decoder
38 #define ZMBV_KEYFRAME 1
39 #define ZMBV_DELTAPAL 2
56 typedef struct ZmbvContext {
57 AVCodecContext *avctx;
61 unsigned int decomp_size;
74 int (*decode_intra)(struct ZmbvContext *c);
75 int (*decode_xor)(struct ZmbvContext *c);
79 * Decode XOR'ed frame - 8bpp version
82 static int zmbv_decode_xor_8(ZmbvContext *c)
84 uint8_t *src = c->decomp_buf;
85 uint8_t *output, *prev;
88 int d, dx, dy, bw2, bh2;
96 if(c->flags & ZMBV_DELTAPAL){
97 for(i = 0; i < 768; i++)
102 src += ((c->bx * c->by * 2 + 3) & ~3);
105 for(y = 0; y < c->height; y += c->bh) {
106 bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
107 for(x = 0; x < c->width; x += c->bw) {
108 uint8_t *out, *tprev;
111 dx = mvec[block] >> 1;
112 dy = mvec[block + 1] >> 1;
115 bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
117 /* copy block - motion vectors out of bounds are used to zero blocks */
119 tprev = prev + x + dx + dy * c->width;
122 for(j = 0; j < bh2; j++){
123 if((my + j < 0) || (my + j >= c->height)) {
126 for(i = 0; i < bw2; i++){
127 if((mx + i < 0) || (mx + i >= c->width))
137 if(d) { /* apply XOR'ed difference */
139 for(j = 0; j < bh2; j++){
140 for(i = 0; i < bw2; i++)
146 output += c->width * c->bh;
147 prev += c->width * c->bh;
149 if(src - c->decomp_buf != c->decomp_len)
150 av_log(c->avctx, AV_LOG_ERROR, "Used %i of %i bytes\n", src-c->decomp_buf, c->decomp_len);
155 * Decode XOR'ed frame - 15bpp and 16bpp version
158 static int zmbv_decode_xor_16(ZmbvContext *c)
160 uint8_t *src = c->decomp_buf;
161 uint16_t *output, *prev;
164 int d, dx, dy, bw2, bh2;
169 output = (uint16_t*)c->cur;
170 prev = (uint16_t*)c->prev;
173 src += ((c->bx * c->by * 2 + 3) & ~3);
176 for(y = 0; y < c->height; y += c->bh) {
177 bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
178 for(x = 0; x < c->width; x += c->bw) {
179 uint16_t *out, *tprev;
182 dx = mvec[block] >> 1;
183 dy = mvec[block + 1] >> 1;
186 bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
188 /* copy block - motion vectors out of bounds are used to zero blocks */
190 tprev = prev + x + dx + dy * c->width;
193 for(j = 0; j < bh2; j++){
194 if((my + j < 0) || (my + j >= c->height)) {
195 memset(out, 0, bw2 * 2);
197 for(i = 0; i < bw2; i++){
198 if((mx + i < 0) || (mx + i >= c->width))
208 if(d) { /* apply XOR'ed difference */
210 for(j = 0; j < bh2; j++){
211 for(i = 0; i < bw2; i++) {
212 out[i] ^= *((uint16_t*)src);
219 output += c->width * c->bh;
220 prev += c->width * c->bh;
222 if(src - c->decomp_buf != c->decomp_len)
223 av_log(c->avctx, AV_LOG_ERROR, "Used %i of %i bytes\n", src-c->decomp_buf, c->decomp_len);
227 #ifdef ZMBV_ENABLE_24BPP
229 * Decode XOR'ed frame - 24bpp version
232 static int zmbv_decode_xor_24(ZmbvContext *c)
234 uint8_t *src = c->decomp_buf;
235 uint8_t *output, *prev;
238 int d, dx, dy, bw2, bh2;
247 stride = c->width * 3;
249 src += ((c->bx * c->by * 2 + 3) & ~3);
252 for(y = 0; y < c->height; y += c->bh) {
253 bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
254 for(x = 0; x < c->width; x += c->bw) {
255 uint8_t *out, *tprev;
258 dx = mvec[block] >> 1;
259 dy = mvec[block + 1] >> 1;
262 bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
264 /* copy block - motion vectors out of bounds are used to zero blocks */
265 out = output + x * 3;
266 tprev = prev + (x + dx) * 3 + dy * stride;
269 for(j = 0; j < bh2; j++){
270 if((my + j < 0) || (my + j >= c->height)) {
271 memset(out, 0, bw2 * 3);
273 for(i = 0; i < bw2; i++){
274 if((mx + i < 0) || (mx + i >= c->width)) {
279 out[i * 3 + 0] = tprev[i * 3 + 0];
280 out[i * 3 + 1] = tprev[i * 3 + 1];
281 out[i * 3 + 2] = tprev[i * 3 + 2];
289 if(d) { /* apply XOR'ed difference */
290 out = output + x * 3;
291 for(j = 0; j < bh2; j++){
292 for(i = 0; i < bw2; i++) {
293 out[i * 3 + 0] ^= *src++;
294 out[i * 3 + 1] ^= *src++;
295 out[i * 3 + 2] ^= *src++;
301 output += stride * c->bh;
302 prev += stride * c->bh;
304 if(src - c->decomp_buf != c->decomp_len)
305 av_log(c->avctx, AV_LOG_ERROR, "Used %i of %i bytes\n", src-c->decomp_buf, c->decomp_len);
308 #endif //ZMBV_ENABLE_24BPP
311 * Decode XOR'ed frame - 32bpp version
314 static int zmbv_decode_xor_32(ZmbvContext *c)
316 uint8_t *src = c->decomp_buf;
317 uint32_t *output, *prev;
320 int d, dx, dy, bw2, bh2;
325 output = (uint32_t*)c->cur;
326 prev = (uint32_t*)c->prev;
329 src += ((c->bx * c->by * 2 + 3) & ~3);
332 for(y = 0; y < c->height; y += c->bh) {
333 bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
334 for(x = 0; x < c->width; x += c->bw) {
335 uint32_t *out, *tprev;
338 dx = mvec[block] >> 1;
339 dy = mvec[block + 1] >> 1;
342 bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
344 /* copy block - motion vectors out of bounds are used to zero blocks */
346 tprev = prev + x + dx + dy * c->width;
349 for(j = 0; j < bh2; j++){
350 if((my + j < 0) || (my + j >= c->height)) {
351 memset(out, 0, bw2 * 4);
353 for(i = 0; i < bw2; i++){
354 if((mx + i < 0) || (mx + i >= c->width))
364 if(d) { /* apply XOR'ed difference */
366 for(j = 0; j < bh2; j++){
367 for(i = 0; i < bw2; i++) {
368 out[i] ^= *((uint32_t*)src);
375 output += c->width * c->bh;
376 prev += c->width * c->bh;
378 if(src - c->decomp_buf != c->decomp_len)
379 av_log(c->avctx, AV_LOG_ERROR, "Used %i of %i bytes\n", src-c->decomp_buf, c->decomp_len);
386 static int zmbv_decode_intra(ZmbvContext *c)
388 uint8_t *src = c->decomp_buf;
390 /* make the palette available on the way out */
391 if (c->fmt == ZMBV_FMT_8BPP) {
392 memcpy(c->pal, src, 768);
396 memcpy(c->cur, src, c->width * c->height * (c->bpp / 8));
400 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
402 ZmbvContext * const c = (ZmbvContext *)avctx->priv_data;
405 int zret = Z_OK; // Zlib return code
411 avctx->release_buffer(avctx, &c->pic);
413 c->pic.reference = 1;
414 c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
415 if(avctx->get_buffer(avctx, &c->pic) < 0){
416 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
420 outptr = c->pic.data[0]; // Output image pointer
425 if(c->flags & ZMBV_KEYFRAME) {
435 av_log(avctx, AV_LOG_DEBUG, "Flags=%X ver=%i.%i comp=%i fmt=%i blk=%ix%i\n",c->flags,hi_ver,lo_ver,c->comp,c->fmt,c->bw,c->bh);
436 if(hi_ver != 0 || lo_ver != 1) {
437 av_log(avctx, AV_LOG_ERROR, "Unsupported version %i.%i\n", hi_ver, lo_ver);
440 if(c->bw == 0 || c->bh == 0) {
441 av_log(avctx, AV_LOG_ERROR, "Unsupported block size %ix%i\n", c->bw, c->bh);
443 if(c->comp != 0 && c->comp != 1) {
444 av_log(avctx, AV_LOG_ERROR, "Unsupported compression type %i\n", c->comp);
451 c->decode_intra = zmbv_decode_intra;
452 c->decode_xor = zmbv_decode_xor_8;
457 c->decode_intra = zmbv_decode_intra;
458 c->decode_xor = zmbv_decode_xor_16;
460 #ifdef ZMBV_ENABLE_24BPP
463 c->decode_intra = zmbv_decode_intra;
464 c->decode_xor = zmbv_decode_xor_24;
466 #endif //ZMBV_ENABLE_24BPP
469 c->decode_intra = zmbv_decode_intra;
470 c->decode_xor = zmbv_decode_xor_32;
473 c->decode_intra = NULL;
474 c->decode_xor = NULL;
475 av_log(avctx, AV_LOG_ERROR, "Unsupported (for now) format %i\n", c->fmt);
479 zret = inflateReset(&c->zstream);
481 av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
485 av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");
487 #endif /* CONFIG_ZLIB */
488 c->cur = av_realloc(c->cur, avctx->width * avctx->height * (c->bpp / 8));
489 c->prev = av_realloc(c->prev, avctx->width * avctx->height * (c->bpp / 8));
490 c->bx = (c->width + c->bw - 1) / c->bw;
491 c->by = (c->height+ c->bh - 1) / c->bh;
494 if(c->decode_intra == NULL) {
495 av_log(avctx, AV_LOG_ERROR, "Error! Got no format or no keyframe!\n");
499 if(c->comp == 0) { //Uncompressed data
500 memcpy(c->decomp_buf, buf, len);
502 } else { // ZLIB-compressed data
504 c->zstream.total_in = c->zstream.total_out = 0;
505 c->zstream.next_in = buf;
506 c->zstream.avail_in = len;
507 c->zstream.next_out = c->decomp_buf;
508 c->zstream.avail_out = c->decomp_size;
509 inflate(&c->zstream, Z_FINISH);
510 c->decomp_len = c->zstream.total_out;
512 av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");
516 if(c->flags & ZMBV_KEYFRAME) {
517 c->pic.key_frame = 1;
518 c->pic.pict_type = FF_I_TYPE;
521 c->pic.key_frame = 0;
522 c->pic.pict_type = FF_P_TYPE;
531 out = c->pic.data[0];
535 for(j = 0; j < c->height; j++) {
536 for(i = 0; i < c->width; i++) {
537 out[i * 3 + 0] = c->pal[(*src) * 3 + 0];
538 out[i * 3 + 1] = c->pal[(*src) * 3 + 1];
539 out[i * 3 + 2] = c->pal[(*src) * 3 + 2];
542 out += c->pic.linesize[0];
546 for(j = 0; j < c->height; j++) {
547 for(i = 0; i < c->width; i++) {
548 uint16_t tmp = LE_16(src);
550 out[i * 3 + 0] = (tmp & 0x7C00) >> 7;
551 out[i * 3 + 1] = (tmp & 0x03E0) >> 2;
552 out[i * 3 + 2] = (tmp & 0x001F) << 3;
554 out += c->pic.linesize[0];
558 for(j = 0; j < c->height; j++) {
559 for(i = 0; i < c->width; i++) {
560 uint16_t tmp = LE_16(src);
562 out[i * 3 + 0] = (tmp & 0xF800) >> 8;
563 out[i * 3 + 1] = (tmp & 0x07E0) >> 3;
564 out[i * 3 + 2] = (tmp & 0x001F) << 3;
566 out += c->pic.linesize[0];
569 #ifdef ZMBV_ENABLE_24BPP
571 for(j = 0; j < c->height; j++) {
572 memcpy(out, src, c->width * 3);
574 out += c->pic.linesize[0];
577 #endif //ZMBV_ENABLE_24BPP
579 for(j = 0; j < c->height; j++) {
580 for(i = 0; i < c->width; i++) {
581 uint32_t tmp = LE_32(src);
583 out[i * 3 + 0] = tmp >> 16;
584 out[i * 3 + 1] = tmp >> 8;
585 out[i * 3 + 2] = tmp >> 0;
587 out += c->pic.linesize[0];
591 av_log(avctx, AV_LOG_ERROR, "Cannot handle format %i\n", c->fmt);
593 memcpy(c->prev, c->cur, c->width * c->height * (c->bpp / 8));
595 *data_size = sizeof(AVFrame);
596 *(AVFrame*)data = c->pic;
598 /* always report that the buffer was completely consumed */
609 static int decode_init(AVCodecContext *avctx)
611 ZmbvContext * const c = (ZmbvContext *)avctx->priv_data;
612 int zret; // Zlib return code
615 avctx->has_b_frames = 0;
617 c->pic.data[0] = NULL;
618 c->width = avctx->width;
619 c->height = avctx->height;
621 if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
624 c->bpp = avctx->bits_per_sample;
627 // Needed if zlib unused or init aborted before inflateInit
628 memset(&(c->zstream), 0, sizeof(z_stream));
630 av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
633 avctx->pix_fmt = PIX_FMT_RGB24;
634 c->decomp_size = (avctx->width + 255) * 4 * (avctx->height + 64);
636 /* Allocate decompression buffer */
637 if (c->decomp_size) {
638 if ((c->decomp_buf = av_malloc(c->decomp_size)) == NULL) {
639 av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
645 c->zstream.zalloc = Z_NULL;
646 c->zstream.zfree = Z_NULL;
647 c->zstream.opaque = Z_NULL;
648 zret = inflateInit(&(c->zstream));
650 av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
662 * Uninit zmbv decoder
665 static int decode_end(AVCodecContext *avctx)
667 ZmbvContext * const c = (ZmbvContext *)avctx->priv_data;
669 av_freep(&c->decomp_buf);
672 avctx->release_buffer(avctx, &c->pic);
674 inflateEnd(&(c->zstream));
682 AVCodec zmbv_decoder = {