2 * Zip Motion Blocks Video (ZMBV) decoder
3 * Copyright (c) 2006 Konstantin Shishkov
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * Zip Motion Blocks Video decoder
36 #define ZMBV_KEYFRAME 1
37 #define ZMBV_DELTAPAL 2
54 typedef struct ZmbvContext {
55 AVCodecContext *avctx;
59 unsigned int decomp_size;
72 int (*decode_intra)(struct ZmbvContext *c);
73 int (*decode_xor)(struct ZmbvContext *c);
77 * Decode XOR'ed frame - 8bpp version
80 static int zmbv_decode_xor_8(ZmbvContext *c)
82 uint8_t *src = c->decomp_buf;
83 uint8_t *output, *prev;
86 int d, dx, dy, bw2, bh2;
94 if(c->flags & ZMBV_DELTAPAL){
95 for(i = 0; i < 768; i++)
100 src += ((c->bx * c->by * 2 + 3) & ~3);
103 for(y = 0; y < c->height; y += c->bh) {
104 bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
105 for(x = 0; x < c->width; x += c->bw) {
106 uint8_t *out, *tprev;
109 dx = mvec[block] >> 1;
110 dy = mvec[block + 1] >> 1;
113 bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
115 /* copy block - motion vectors out of bounds are used to zero blocks */
117 tprev = prev + x + dx + dy * c->width;
120 for(j = 0; j < bh2; j++){
121 if((my + j < 0) || (my + j >= c->height)) {
124 for(i = 0; i < bw2; i++){
125 if((mx + i < 0) || (mx + i >= c->width))
135 if(d) { /* apply XOR'ed difference */
137 for(j = 0; j < bh2; j++){
138 for(i = 0; i < bw2; i++)
144 output += c->width * c->bh;
145 prev += c->width * c->bh;
147 if(src - c->decomp_buf != c->decomp_len)
148 av_log(c->avctx, AV_LOG_ERROR, "Used %i of %i bytes\n", src-c->decomp_buf, c->decomp_len);
153 * Decode XOR'ed frame - 15bpp and 16bpp version
156 static int zmbv_decode_xor_16(ZmbvContext *c)
158 uint8_t *src = c->decomp_buf;
159 uint16_t *output, *prev;
162 int d, dx, dy, bw2, bh2;
167 output = (uint16_t*)c->cur;
168 prev = (uint16_t*)c->prev;
171 src += ((c->bx * c->by * 2 + 3) & ~3);
174 for(y = 0; y < c->height; y += c->bh) {
175 bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
176 for(x = 0; x < c->width; x += c->bw) {
177 uint16_t *out, *tprev;
180 dx = mvec[block] >> 1;
181 dy = mvec[block + 1] >> 1;
184 bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
186 /* copy block - motion vectors out of bounds are used to zero blocks */
188 tprev = prev + x + dx + dy * c->width;
191 for(j = 0; j < bh2; j++){
192 if((my + j < 0) || (my + j >= c->height)) {
193 memset(out, 0, bw2 * 2);
195 for(i = 0; i < bw2; i++){
196 if((mx + i < 0) || (mx + i >= c->width))
206 if(d) { /* apply XOR'ed difference */
208 for(j = 0; j < bh2; j++){
209 for(i = 0; i < bw2; i++) {
210 out[i] ^= *((uint16_t*)src);
217 output += c->width * c->bh;
218 prev += c->width * c->bh;
220 if(src - c->decomp_buf != c->decomp_len)
221 av_log(c->avctx, AV_LOG_ERROR, "Used %i of %i bytes\n", src-c->decomp_buf, c->decomp_len);
225 #ifdef ZMBV_ENABLE_24BPP
227 * Decode XOR'ed frame - 24bpp version
230 static int zmbv_decode_xor_24(ZmbvContext *c)
232 uint8_t *src = c->decomp_buf;
233 uint8_t *output, *prev;
236 int d, dx, dy, bw2, bh2;
245 stride = c->width * 3;
247 src += ((c->bx * c->by * 2 + 3) & ~3);
250 for(y = 0; y < c->height; y += c->bh) {
251 bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
252 for(x = 0; x < c->width; x += c->bw) {
253 uint8_t *out, *tprev;
256 dx = mvec[block] >> 1;
257 dy = mvec[block + 1] >> 1;
260 bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
262 /* copy block - motion vectors out of bounds are used to zero blocks */
263 out = output + x * 3;
264 tprev = prev + (x + dx) * 3 + dy * stride;
267 for(j = 0; j < bh2; j++){
268 if((my + j < 0) || (my + j >= c->height)) {
269 memset(out, 0, bw2 * 3);
271 for(i = 0; i < bw2; i++){
272 if((mx + i < 0) || (mx + i >= c->width)) {
277 out[i * 3 + 0] = tprev[i * 3 + 0];
278 out[i * 3 + 1] = tprev[i * 3 + 1];
279 out[i * 3 + 2] = tprev[i * 3 + 2];
287 if(d) { /* apply XOR'ed difference */
288 out = output + x * 3;
289 for(j = 0; j < bh2; j++){
290 for(i = 0; i < bw2; i++) {
291 out[i * 3 + 0] ^= *src++;
292 out[i * 3 + 1] ^= *src++;
293 out[i * 3 + 2] ^= *src++;
299 output += stride * c->bh;
300 prev += stride * c->bh;
302 if(src - c->decomp_buf != c->decomp_len)
303 av_log(c->avctx, AV_LOG_ERROR, "Used %i of %i bytes\n", src-c->decomp_buf, c->decomp_len);
306 #endif //ZMBV_ENABLE_24BPP
309 * Decode XOR'ed frame - 32bpp version
312 static int zmbv_decode_xor_32(ZmbvContext *c)
314 uint8_t *src = c->decomp_buf;
315 uint32_t *output, *prev;
318 int d, dx, dy, bw2, bh2;
323 output = (uint32_t*)c->cur;
324 prev = (uint32_t*)c->prev;
327 src += ((c->bx * c->by * 2 + 3) & ~3);
330 for(y = 0; y < c->height; y += c->bh) {
331 bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
332 for(x = 0; x < c->width; x += c->bw) {
333 uint32_t *out, *tprev;
336 dx = mvec[block] >> 1;
337 dy = mvec[block + 1] >> 1;
340 bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
342 /* copy block - motion vectors out of bounds are used to zero blocks */
344 tprev = prev + x + dx + dy * c->width;
347 for(j = 0; j < bh2; j++){
348 if((my + j < 0) || (my + j >= c->height)) {
349 memset(out, 0, bw2 * 4);
351 for(i = 0; i < bw2; i++){
352 if((mx + i < 0) || (mx + i >= c->width))
362 if(d) { /* apply XOR'ed difference */
364 for(j = 0; j < bh2; j++){
365 for(i = 0; i < bw2; i++) {
366 out[i] ^= *((uint32_t*)src);
373 output += c->width * c->bh;
374 prev += c->width * c->bh;
376 if(src - c->decomp_buf != c->decomp_len)
377 av_log(c->avctx, AV_LOG_ERROR, "Used %i of %i bytes\n", src-c->decomp_buf, c->decomp_len);
384 static int zmbv_decode_intra(ZmbvContext *c)
386 uint8_t *src = c->decomp_buf;
388 /* make the palette available on the way out */
389 if (c->fmt == ZMBV_FMT_8BPP) {
390 memcpy(c->pal, src, 768);
394 memcpy(c->cur, src, c->width * c->height * (c->bpp / 8));
398 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
400 ZmbvContext * const c = (ZmbvContext *)avctx->priv_data;
403 int zret = Z_OK; // Zlib return code
409 avctx->release_buffer(avctx, &c->pic);
411 c->pic.reference = 1;
412 c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
413 if(avctx->get_buffer(avctx, &c->pic) < 0){
414 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
418 outptr = c->pic.data[0]; // Output image pointer
423 if(c->flags & ZMBV_KEYFRAME) {
433 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);
434 if(hi_ver != 0 || lo_ver != 1) {
435 av_log(avctx, AV_LOG_ERROR, "Unsupported version %i.%i\n", hi_ver, lo_ver);
438 if(c->bw == 0 || c->bh == 0) {
439 av_log(avctx, AV_LOG_ERROR, "Unsupported block size %ix%i\n", c->bw, c->bh);
441 if(c->comp != 0 && c->comp != 1) {
442 av_log(avctx, AV_LOG_ERROR, "Unsupported compression type %i\n", c->comp);
449 c->decode_intra = zmbv_decode_intra;
450 c->decode_xor = zmbv_decode_xor_8;
455 c->decode_intra = zmbv_decode_intra;
456 c->decode_xor = zmbv_decode_xor_16;
458 #ifdef ZMBV_ENABLE_24BPP
461 c->decode_intra = zmbv_decode_intra;
462 c->decode_xor = zmbv_decode_xor_24;
464 #endif //ZMBV_ENABLE_24BPP
467 c->decode_intra = zmbv_decode_intra;
468 c->decode_xor = zmbv_decode_xor_32;
471 c->decode_intra = NULL;
472 c->decode_xor = NULL;
473 av_log(avctx, AV_LOG_ERROR, "Unsupported (for now) format %i\n", c->fmt);
477 zret = inflateReset(&c->zstream);
479 av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
483 av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");
485 #endif /* CONFIG_ZLIB */
486 c->cur = av_realloc(c->cur, avctx->width * avctx->height * (c->bpp / 8));
487 c->prev = av_realloc(c->prev, avctx->width * avctx->height * (c->bpp / 8));
488 c->bx = (c->width + c->bw - 1) / c->bw;
489 c->by = (c->height+ c->bh - 1) / c->bh;
492 if(c->decode_intra == NULL) {
493 av_log(avctx, AV_LOG_ERROR, "Error! Got no format or no keyframe!\n");
497 if(c->comp == 0) { //Uncompressed data
498 memcpy(c->decomp_buf, buf, len);
500 } else { // ZLIB-compressed data
502 c->zstream.total_in = c->zstream.total_out = 0;
503 c->zstream.next_in = buf;
504 c->zstream.avail_in = len;
505 c->zstream.next_out = c->decomp_buf;
506 c->zstream.avail_out = c->decomp_size;
507 inflate(&c->zstream, Z_FINISH);
508 c->decomp_len = c->zstream.total_out;
510 av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");
514 if(c->flags & ZMBV_KEYFRAME) {
515 c->pic.key_frame = 1;
516 c->pic.pict_type = FF_I_TYPE;
519 c->pic.key_frame = 0;
520 c->pic.pict_type = FF_P_TYPE;
529 out = c->pic.data[0];
533 for(j = 0; j < c->height; j++) {
534 for(i = 0; i < c->width; i++) {
535 out[i * 3 + 0] = c->pal[(*src) * 3 + 0];
536 out[i * 3 + 1] = c->pal[(*src) * 3 + 1];
537 out[i * 3 + 2] = c->pal[(*src) * 3 + 2];
540 out += c->pic.linesize[0];
544 for(j = 0; j < c->height; j++) {
545 for(i = 0; i < c->width; i++) {
546 uint16_t tmp = LE_16(src);
548 out[i * 3 + 0] = (tmp & 0x7C00) >> 7;
549 out[i * 3 + 1] = (tmp & 0x03E0) >> 2;
550 out[i * 3 + 2] = (tmp & 0x001F) << 3;
552 out += c->pic.linesize[0];
556 for(j = 0; j < c->height; j++) {
557 for(i = 0; i < c->width; i++) {
558 uint16_t tmp = LE_16(src);
560 out[i * 3 + 0] = (tmp & 0xF800) >> 8;
561 out[i * 3 + 1] = (tmp & 0x07E0) >> 3;
562 out[i * 3 + 2] = (tmp & 0x001F) << 3;
564 out += c->pic.linesize[0];
567 #ifdef ZMBV_ENABLE_24BPP
569 for(j = 0; j < c->height; j++) {
570 memcpy(out, src, c->width * 3);
572 out += c->pic.linesize[0];
575 #endif //ZMBV_ENABLE_24BPP
577 for(j = 0; j < c->height; j++) {
578 for(i = 0; i < c->width; i++) {
579 uint32_t tmp = LE_32(src);
581 out[i * 3 + 0] = tmp >> 16;
582 out[i * 3 + 1] = tmp >> 8;
583 out[i * 3 + 2] = tmp >> 0;
585 out += c->pic.linesize[0];
589 av_log(avctx, AV_LOG_ERROR, "Cannot handle format %i\n", c->fmt);
591 memcpy(c->prev, c->cur, c->width * c->height * (c->bpp / 8));
593 *data_size = sizeof(AVFrame);
594 *(AVFrame*)data = c->pic;
596 /* always report that the buffer was completely consumed */
607 static int decode_init(AVCodecContext *avctx)
609 ZmbvContext * const c = (ZmbvContext *)avctx->priv_data;
610 int zret; // Zlib return code
613 avctx->has_b_frames = 0;
615 c->pic.data[0] = NULL;
616 c->width = avctx->width;
617 c->height = avctx->height;
619 if (avcodec_check_dimensions(avctx, avctx->height, avctx->width) < 0) {
622 c->bpp = avctx->bits_per_sample;
625 // Needed if zlib unused or init aborted before inflateInit
626 memset(&(c->zstream), 0, sizeof(z_stream));
628 av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
631 avctx->pix_fmt = PIX_FMT_RGB24;
632 c->decomp_size = (avctx->width + 255) * 4 * (avctx->height + 64);
634 /* Allocate decompression buffer */
635 if (c->decomp_size) {
636 if ((c->decomp_buf = av_malloc(c->decomp_size)) == NULL) {
637 av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
643 c->zstream.zalloc = Z_NULL;
644 c->zstream.zfree = Z_NULL;
645 c->zstream.opaque = Z_NULL;
646 zret = inflateInit(&(c->zstream));
648 av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
660 * Uninit zmbv decoder
663 static int decode_end(AVCodecContext *avctx)
665 ZmbvContext * const c = (ZmbvContext *)avctx->priv_data;
667 av_freep(&c->decomp_buf);
670 avctx->release_buffer(avctx, &c->pic);
672 inflateEnd(&(c->zstream));
680 AVCodec zmbv_decoder = {