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
23 * @file libavcodec/zmbv.c
24 * Zip Motion Blocks Video decoder
30 #include "libavutil/intreadwrite.h"
35 #define ZMBV_KEYFRAME 1
36 #define ZMBV_DELTAPAL 2
53 typedef struct ZmbvContext {
54 AVCodecContext *avctx;
58 unsigned int decomp_size;
69 int (*decode_intra)(struct ZmbvContext *c);
70 int (*decode_xor)(struct ZmbvContext *c);
74 * Decode XOR'ed frame - 8bpp version
77 static int zmbv_decode_xor_8(ZmbvContext *c)
79 uint8_t *src = c->decomp_buf;
80 uint8_t *output, *prev;
83 int d, dx, dy, bw2, bh2;
91 if(c->flags & ZMBV_DELTAPAL){
92 for(i = 0; i < 768; i++)
97 src += ((c->bx * c->by * 2 + 3) & ~3);
100 for(y = 0; y < c->height; y += c->bh) {
101 bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
102 for(x = 0; x < c->width; x += c->bw) {
103 uint8_t *out, *tprev;
106 dx = mvec[block] >> 1;
107 dy = mvec[block + 1] >> 1;
110 bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
112 /* copy block - motion vectors out of bounds are used to zero blocks */
114 tprev = prev + x + dx + dy * c->width;
117 for(j = 0; j < bh2; j++){
118 if((my + j < 0) || (my + j >= c->height)) {
121 for(i = 0; i < bw2; i++){
122 if((mx + i < 0) || (mx + i >= c->width))
132 if(d) { /* apply XOR'ed difference */
134 for(j = 0; j < bh2; j++){
135 for(i = 0; i < bw2; i++)
141 output += c->width * c->bh;
142 prev += c->width * c->bh;
144 if(src - c->decomp_buf != c->decomp_len)
145 av_log(c->avctx, AV_LOG_ERROR, "Used %ti of %i bytes\n", src-c->decomp_buf, c->decomp_len);
150 * Decode XOR'ed frame - 15bpp and 16bpp version
153 static int zmbv_decode_xor_16(ZmbvContext *c)
155 uint8_t *src = c->decomp_buf;
156 uint16_t *output, *prev;
159 int d, dx, dy, bw2, bh2;
164 output = (uint16_t*)c->cur;
165 prev = (uint16_t*)c->prev;
168 src += ((c->bx * c->by * 2 + 3) & ~3);
171 for(y = 0; y < c->height; y += c->bh) {
172 bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
173 for(x = 0; x < c->width; x += c->bw) {
174 uint16_t *out, *tprev;
177 dx = mvec[block] >> 1;
178 dy = mvec[block + 1] >> 1;
181 bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
183 /* copy block - motion vectors out of bounds are used to zero blocks */
185 tprev = prev + x + dx + dy * c->width;
188 for(j = 0; j < bh2; j++){
189 if((my + j < 0) || (my + j >= c->height)) {
190 memset(out, 0, bw2 * 2);
192 for(i = 0; i < bw2; i++){
193 if((mx + i < 0) || (mx + i >= c->width))
203 if(d) { /* apply XOR'ed difference */
205 for(j = 0; j < bh2; j++){
206 for(i = 0; i < bw2; i++) {
207 out[i] ^= *((uint16_t*)src);
214 output += c->width * c->bh;
215 prev += c->width * c->bh;
217 if(src - c->decomp_buf != c->decomp_len)
218 av_log(c->avctx, AV_LOG_ERROR, "Used %ti of %i bytes\n", src-c->decomp_buf, c->decomp_len);
222 #ifdef ZMBV_ENABLE_24BPP
224 * Decode XOR'ed frame - 24bpp version
227 static int zmbv_decode_xor_24(ZmbvContext *c)
229 uint8_t *src = c->decomp_buf;
230 uint8_t *output, *prev;
233 int d, dx, dy, bw2, bh2;
242 stride = c->width * 3;
244 src += ((c->bx * c->by * 2 + 3) & ~3);
247 for(y = 0; y < c->height; y += c->bh) {
248 bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
249 for(x = 0; x < c->width; x += c->bw) {
250 uint8_t *out, *tprev;
253 dx = mvec[block] >> 1;
254 dy = mvec[block + 1] >> 1;
257 bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
259 /* copy block - motion vectors out of bounds are used to zero blocks */
260 out = output + x * 3;
261 tprev = prev + (x + dx) * 3 + dy * stride;
264 for(j = 0; j < bh2; j++){
265 if((my + j < 0) || (my + j >= c->height)) {
266 memset(out, 0, bw2 * 3);
268 for(i = 0; i < bw2; i++){
269 if((mx + i < 0) || (mx + i >= c->width)) {
274 out[i * 3 + 0] = tprev[i * 3 + 0];
275 out[i * 3 + 1] = tprev[i * 3 + 1];
276 out[i * 3 + 2] = tprev[i * 3 + 2];
284 if(d) { /* apply XOR'ed difference */
285 out = output + x * 3;
286 for(j = 0; j < bh2; j++){
287 for(i = 0; i < bw2; i++) {
288 out[i * 3 + 0] ^= *src++;
289 out[i * 3 + 1] ^= *src++;
290 out[i * 3 + 2] ^= *src++;
296 output += stride * c->bh;
297 prev += stride * c->bh;
299 if(src - c->decomp_buf != c->decomp_len)
300 av_log(c->avctx, AV_LOG_ERROR, "Used %i of %i bytes\n", src-c->decomp_buf, c->decomp_len);
303 #endif //ZMBV_ENABLE_24BPP
306 * Decode XOR'ed frame - 32bpp version
309 static int zmbv_decode_xor_32(ZmbvContext *c)
311 uint8_t *src = c->decomp_buf;
312 uint32_t *output, *prev;
315 int d, dx, dy, bw2, bh2;
320 output = (uint32_t*)c->cur;
321 prev = (uint32_t*)c->prev;
324 src += ((c->bx * c->by * 2 + 3) & ~3);
327 for(y = 0; y < c->height; y += c->bh) {
328 bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
329 for(x = 0; x < c->width; x += c->bw) {
330 uint32_t *out, *tprev;
333 dx = mvec[block] >> 1;
334 dy = mvec[block + 1] >> 1;
337 bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
339 /* copy block - motion vectors out of bounds are used to zero blocks */
341 tprev = prev + x + dx + dy * c->width;
344 for(j = 0; j < bh2; j++){
345 if((my + j < 0) || (my + j >= c->height)) {
346 memset(out, 0, bw2 * 4);
348 for(i = 0; i < bw2; i++){
349 if((mx + i < 0) || (mx + i >= c->width))
359 if(d) { /* apply XOR'ed difference */
361 for(j = 0; j < bh2; j++){
362 for(i = 0; i < bw2; i++) {
363 out[i] ^= *((uint32_t*)src);
370 output += c->width * c->bh;
371 prev += c->width * c->bh;
373 if(src - c->decomp_buf != c->decomp_len)
374 av_log(c->avctx, AV_LOG_ERROR, "Used %ti of %i bytes\n", src-c->decomp_buf, c->decomp_len);
381 static int zmbv_decode_intra(ZmbvContext *c)
383 uint8_t *src = c->decomp_buf;
385 /* make the palette available on the way out */
386 if (c->fmt == ZMBV_FMT_8BPP) {
387 memcpy(c->pal, src, 768);
391 memcpy(c->cur, src, c->width * c->height * (c->bpp / 8));
395 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
397 const uint8_t *buf = avpkt->data;
398 int buf_size = avpkt->size;
399 ZmbvContext * const c = avctx->priv_data;
401 int zret = Z_OK; // Zlib return code
406 avctx->release_buffer(avctx, &c->pic);
408 c->pic.reference = 1;
409 c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
410 if(avctx->get_buffer(avctx, &c->pic) < 0){
411 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
415 outptr = c->pic.data[0]; // Output image pointer
420 if(c->flags & ZMBV_KEYFRAME) {
430 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);
431 if(hi_ver != 0 || lo_ver != 1) {
432 av_log(avctx, AV_LOG_ERROR, "Unsupported version %i.%i\n", hi_ver, lo_ver);
435 if(c->bw == 0 || c->bh == 0) {
436 av_log(avctx, AV_LOG_ERROR, "Unsupported block size %ix%i\n", c->bw, c->bh);
438 if(c->comp != 0 && c->comp != 1) {
439 av_log(avctx, AV_LOG_ERROR, "Unsupported compression type %i\n", c->comp);
446 c->decode_intra = zmbv_decode_intra;
447 c->decode_xor = zmbv_decode_xor_8;
452 c->decode_intra = zmbv_decode_intra;
453 c->decode_xor = zmbv_decode_xor_16;
455 #ifdef ZMBV_ENABLE_24BPP
458 c->decode_intra = zmbv_decode_intra;
459 c->decode_xor = zmbv_decode_xor_24;
461 #endif //ZMBV_ENABLE_24BPP
464 c->decode_intra = zmbv_decode_intra;
465 c->decode_xor = zmbv_decode_xor_32;
468 c->decode_intra = NULL;
469 c->decode_xor = NULL;
470 av_log(avctx, AV_LOG_ERROR, "Unsupported (for now) format %i\n", c->fmt);
474 zret = inflateReset(&c->zstream);
476 av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
480 c->cur = av_realloc(c->cur, avctx->width * avctx->height * (c->bpp / 8));
481 c->prev = av_realloc(c->prev, avctx->width * avctx->height * (c->bpp / 8));
482 c->bx = (c->width + c->bw - 1) / c->bw;
483 c->by = (c->height+ c->bh - 1) / c->bh;
486 if(c->decode_intra == NULL) {
487 av_log(avctx, AV_LOG_ERROR, "Error! Got no format or no keyframe!\n");
491 if(c->comp == 0) { //Uncompressed data
492 memcpy(c->decomp_buf, buf, len);
494 } else { // ZLIB-compressed data
495 c->zstream.total_in = c->zstream.total_out = 0;
496 c->zstream.next_in = buf;
497 c->zstream.avail_in = len;
498 c->zstream.next_out = c->decomp_buf;
499 c->zstream.avail_out = c->decomp_size;
500 inflate(&c->zstream, Z_FINISH);
501 c->decomp_len = c->zstream.total_out;
503 if(c->flags & ZMBV_KEYFRAME) {
504 c->pic.key_frame = 1;
505 c->pic.pict_type = FF_I_TYPE;
508 c->pic.key_frame = 0;
509 c->pic.pict_type = FF_P_TYPE;
519 out = c->pic.data[0];
523 for(j = 0; j < c->height; j++) {
524 for(i = 0; i < c->width; i++) {
525 out[i * 3 + 0] = c->pal[(*src) * 3 + 0];
526 out[i * 3 + 1] = c->pal[(*src) * 3 + 1];
527 out[i * 3 + 2] = c->pal[(*src) * 3 + 2];
530 out += c->pic.linesize[0];
534 for(j = 0; j < c->height; j++) {
535 for(i = 0; i < c->width; i++) {
536 uint16_t tmp = AV_RL16(src);
538 out[i * 3 + 0] = (tmp & 0x7C00) >> 7;
539 out[i * 3 + 1] = (tmp & 0x03E0) >> 2;
540 out[i * 3 + 2] = (tmp & 0x001F) << 3;
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 = AV_RL16(src);
550 out[i * 3 + 0] = (tmp & 0xF800) >> 8;
551 out[i * 3 + 1] = (tmp & 0x07E0) >> 3;
552 out[i * 3 + 2] = (tmp & 0x001F) << 3;
554 out += c->pic.linesize[0];
557 #ifdef ZMBV_ENABLE_24BPP
559 for(j = 0; j < c->height; j++) {
560 memcpy(out, src, c->width * 3);
562 out += c->pic.linesize[0];
565 #endif //ZMBV_ENABLE_24BPP
567 for(j = 0; j < c->height; j++) {
568 for(i = 0; i < c->width; i++) {
569 uint32_t tmp = AV_RL32(src);
571 AV_WB24(out+(i*3), tmp);
573 out += c->pic.linesize[0];
577 av_log(avctx, AV_LOG_ERROR, "Cannot handle format %i\n", c->fmt);
579 memcpy(c->prev, c->cur, c->width * c->height * (c->bpp / 8));
581 *data_size = sizeof(AVFrame);
582 *(AVFrame*)data = c->pic;
584 /* always report that the buffer was completely consumed */
595 static av_cold int decode_init(AVCodecContext *avctx)
597 ZmbvContext * const c = avctx->priv_data;
598 int zret; // Zlib return code
602 c->width = avctx->width;
603 c->height = avctx->height;
605 if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
608 c->bpp = avctx->bits_per_coded_sample;
610 // Needed if zlib unused or init aborted before inflateInit
611 memset(&(c->zstream), 0, sizeof(z_stream));
613 avctx->pix_fmt = PIX_FMT_RGB24;
614 c->decomp_size = (avctx->width + 255) * 4 * (avctx->height + 64);
616 /* Allocate decompression buffer */
617 if (c->decomp_size) {
618 if ((c->decomp_buf = av_malloc(c->decomp_size)) == NULL) {
619 av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
624 c->zstream.zalloc = Z_NULL;
625 c->zstream.zfree = Z_NULL;
626 c->zstream.opaque = Z_NULL;
627 zret = inflateInit(&(c->zstream));
629 av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
640 * Uninit zmbv decoder
643 static av_cold int decode_end(AVCodecContext *avctx)
645 ZmbvContext * const c = avctx->priv_data;
647 av_freep(&c->decomp_buf);
650 avctx->release_buffer(avctx, &c->pic);
651 inflateEnd(&(c->zstream));
658 AVCodec zmbv_decoder = {
668 .long_name = NULL_IF_CONFIG_SMALL("Zip Motion Blocks Video"),