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
27 * Based on http://wiki.multimedia.cx/index.php?title=Smacker
36 #define ALT_BITSTREAM_READER_LE
37 #include "bitstream.h"
39 #define SMKTREE_BITS 9
40 #define SMK_NODE 0x80000000
45 typedef struct SmackVContext {
46 AVCodecContext *avctx;
49 int *mmap_tbl, *mclr_tbl, *full_tbl, *type_tbl;
50 int mmap_last[3], mclr_last[3], full_last[3], type_last[3];
54 * Context used for code reconstructing
56 typedef struct HuffContext {
65 /* common parameters used for decode_bigtree */
66 typedef struct DBCtx {
68 int *recode1, *recode2;
74 /* possible runs of blocks */
75 static const int block_runs[64] = {
76 1, 2, 3, 4, 5, 6, 7, 8,
77 9, 10, 11, 12, 13, 14, 15, 16,
78 17, 18, 19, 20, 21, 22, 23, 24,
79 25, 26, 27, 28, 29, 30, 31, 32,
80 33, 34, 35, 36, 37, 38, 39, 40,
81 41, 42, 43, 44, 45, 46, 47, 48,
82 49, 50, 51, 52, 53, 54, 55, 56,
83 57, 58, 59, 128, 256, 512, 1024, 2048 };
92 * Decode local frame tree
94 static int smacker_decode_tree(GetBitContext *gb, HuffContext *hc, uint32_t prefix, int length)
96 if(!get_bits1(gb)){ //Leaf
97 if(hc->current >= 256){
98 av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");
102 hc->bits[hc->current] = prefix;
103 hc->lengths[hc->current] = length;
105 hc->bits[hc->current] = 0;
106 hc->lengths[hc->current] = 0;
108 hc->values[hc->current] = get_bits(gb, 8);
110 if(hc->maxlength < length)
111 hc->maxlength = length;
116 r = smacker_decode_tree(gb, hc, prefix, length);
119 return smacker_decode_tree(gb, hc, prefix | (1 << (length - 1)), length);
126 static int smacker_decode_bigtree(GetBitContext *gb, HuffContext *hc, DBCtx *ctx)
128 if(!get_bits1(gb)){ //Leaf
129 int val, i1, i2, b1, b2;
130 if(hc->current >= hc->length){
131 av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");
134 b1 = get_bits_count(gb);
135 i1 = get_vlc2(gb, ctx->v1->table, SMKTREE_BITS, 3);
136 b1 = get_bits_count(gb) - b1;
137 b2 = get_bits_count(gb);
138 i2 = get_vlc2(gb, ctx->v2->table, SMKTREE_BITS, 3);
139 b2 = get_bits_count(gb) - b2;
140 val = ctx->recode1[i1] | (ctx->recode2[i2] << 8);
141 if(val == ctx->escapes[0]) {
142 ctx->last[0] = hc->current;
144 } else if(val == ctx->escapes[1]) {
145 ctx->last[1] = hc->current;
147 } else if(val == ctx->escapes[2]) {
148 ctx->last[2] = hc->current;
152 hc->values[hc->current++] = val;
158 r = smacker_decode_bigtree(gb, hc, ctx);
161 hc->values[t] = SMK_NODE | r;
163 r += smacker_decode_bigtree(gb, hc, ctx);
169 * Store large tree as FFmpeg's vlc codes
171 static int smacker_decode_header_tree(SmackVContext *smk, GetBitContext *gb, int **recodes, int *last, int size)
175 HuffContext tmp1, tmp2;
183 tmp1.bits = av_mallocz(256 * 4);
184 tmp1.lengths = av_mallocz(256 * sizeof(int));
185 tmp1.values = av_mallocz(256 * sizeof(int));
190 tmp2.bits = av_mallocz(256 * 4);
191 tmp2.lengths = av_mallocz(256 * sizeof(int));
192 tmp2.values = av_mallocz(256 * sizeof(int));
194 memset(&vlc[0], 0, sizeof(VLC));
195 memset(&vlc[1], 0, sizeof(VLC));
198 smacker_decode_tree(gb, &tmp1, 0, 0);
200 res = init_vlc(&vlc[0], SMKTREE_BITS, tmp1.length,
201 tmp1.lengths, sizeof(int), sizeof(int),
202 tmp1.bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
204 av_log(smk->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
208 av_log(smk->avctx, AV_LOG_ERROR, "Skipping low bytes tree\n");
211 smacker_decode_tree(gb, &tmp2, 0, 0);
213 res = init_vlc(&vlc[1], SMKTREE_BITS, tmp2.length,
214 tmp2.lengths, sizeof(int), sizeof(int),
215 tmp2.bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
217 av_log(smk->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
221 av_log(smk->avctx, AV_LOG_ERROR, "Skipping high bytes tree\n");
224 escapes[0] = get_bits(gb, 8);
225 escapes[0] |= get_bits(gb, 8) << 8;
226 escapes[1] = get_bits(gb, 8);
227 escapes[1] |= get_bits(gb, 8) << 8;
228 escapes[2] = get_bits(gb, 8);
229 escapes[2] |= get_bits(gb, 8) << 8;
231 last[0] = last[1] = last[2] = -1;
233 ctx.escapes[0] = escapes[0];
234 ctx.escapes[1] = escapes[1];
235 ctx.escapes[2] = escapes[2];
238 ctx.recode1 = tmp1.values;
239 ctx.recode2 = tmp2.values;
242 huff.length = ((size + 3) >> 2) + 3;
245 huff.values = av_mallocz(huff.length * sizeof(int));
247 smacker_decode_bigtree(gb, &huff, &ctx);
249 if(ctx.last[0] == -1) ctx.last[0] = huff.current++;
250 if(ctx.last[1] == -1) ctx.last[1] = huff.current++;
251 if(ctx.last[2] == -1) ctx.last[2] = huff.current++;
253 *recodes = huff.values;
260 av_free(tmp1.lengths);
261 av_free(tmp1.values);
263 av_free(tmp2.lengths);
264 av_free(tmp2.values);
269 static int decode_header_trees(SmackVContext *smk) {
271 int mmap_size, mclr_size, full_size, type_size;
273 mmap_size = LE_32(smk->avctx->extradata);
274 mclr_size = LE_32(smk->avctx->extradata + 4);
275 full_size = LE_32(smk->avctx->extradata + 8);
276 type_size = LE_32(smk->avctx->extradata + 12);
278 init_get_bits(&gb, smk->avctx->extradata + 16, (smk->avctx->extradata_size - 16) * 8);
280 if(!get_bits1(&gb)) {
281 av_log(smk->avctx, AV_LOG_INFO, "Skipping MMAP tree\n");
282 smk->mmap_tbl = av_malloc(sizeof(int) * 2);
283 smk->mmap_tbl[0] = 0;
284 smk->mmap_last[0] = smk->mmap_last[1] = smk->mmap_last[2] = 1;
286 smacker_decode_header_tree(smk, &gb, &smk->mmap_tbl, smk->mmap_last, mmap_size);
288 if(!get_bits(&gb, 1)) {
289 av_log(smk->avctx, AV_LOG_INFO, "Skipping MCLR tree\n");
290 smk->mclr_tbl = av_malloc(sizeof(int) * 2);
291 smk->mclr_tbl[0] = 0;
292 smk->mclr_last[0] = smk->mclr_last[1] = smk->mclr_last[2] = 1;
294 smacker_decode_header_tree(smk, &gb, &smk->mclr_tbl, smk->mclr_last, mclr_size);
296 if(!get_bits(&gb, 1)) {
297 av_log(smk->avctx, AV_LOG_INFO, "Skipping FULL tree\n");
298 smk->full_tbl = av_malloc(sizeof(int) * 2);
299 smk->full_tbl[0] = 0;
300 smk->full_last[0] = smk->full_last[1] = smk->full_last[2] = 1;
302 smacker_decode_header_tree(smk, &gb, &smk->full_tbl, smk->full_last, full_size);
304 if(!get_bits(&gb, 1)) {
305 av_log(smk->avctx, AV_LOG_INFO, "Skipping TYPE tree\n");
306 smk->type_tbl = av_malloc(sizeof(int) * 2);
307 smk->type_tbl[0] = 0;
308 smk->type_last[0] = smk->type_last[1] = smk->type_last[2] = 1;
310 smacker_decode_header_tree(smk, &gb, &smk->type_tbl, smk->type_last, type_size);
316 static always_inline void last_reset(int *recode, int *last) {
317 recode[last[0]] = recode[last[1]] = recode[last[2]] = 0;
320 /* get code and update history */
321 static always_inline int smk_get_code(GetBitContext *gb, int *recode, int *last) {
322 register int *table = recode;
325 b = get_bits_count(gb);
326 while(*table & SMK_NODE) {
328 table += (*table) & (~SMK_NODE);
332 b = get_bits_count(gb) - b;
334 if(v != recode[last[0]]) {
335 recode[last[2]] = recode[last[1]];
336 recode[last[1]] = recode[last[0]];
342 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
344 SmackVContext * const smk = (SmackVContext *)avctx->priv_data;
348 int blocks, blk, bw, bh;
355 avctx->release_buffer(avctx, &smk->pic);
357 smk->pic.reference = 1;
358 smk->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
359 if(avctx->reget_buffer(avctx, &smk->pic) < 0){
360 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
364 /* make the palette available on the way out */
366 pal = (uint32_t*)smk->pic.data[1];
367 smk->pic.palette_has_changed = buf[0] & 1;
368 smk->pic.key_frame = !!(buf[0] & 2);
369 if(smk->pic.key_frame)
370 smk->pic.pict_type = FF_I_TYPE;
372 smk->pic.pict_type = FF_P_TYPE;
374 for(i = 0; i < 256; i++) {
379 *pal++ = (r << 16) | (g << 8) | b;
382 last_reset(smk->mmap_tbl, smk->mmap_last);
383 last_reset(smk->mclr_tbl, smk->mclr_last);
384 last_reset(smk->full_tbl, smk->full_last);
385 last_reset(smk->type_tbl, smk->type_last);
386 init_get_bits(&gb, buf + 769, (buf_size - 769) * 8);
389 bw = avctx->width >> 2;
390 bh = avctx->height >> 2;
392 out = smk->pic.data[0];
393 stride = smk->pic.linesize[0];
394 while(blk < blocks) {
398 type = smk_get_code(&gb, smk->type_tbl, smk->type_last);
399 run = block_runs[(type >> 2) & 0x3F];
402 while(run-- && blk < blocks){
405 clr = smk_get_code(&gb, smk->mclr_tbl, smk->mclr_last);
406 map = smk_get_code(&gb, smk->mmap_tbl, smk->mmap_last);
407 out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
410 for(i = 0; i < 4; i++) {
411 if(map & 1) out[0] = hi; else out[0] = lo;
412 if(map & 2) out[1] = hi; else out[1] = lo;
413 if(map & 4) out[2] = hi; else out[2] = lo;
414 if(map & 8) out[3] = hi; else out[3] = lo;
423 if(avctx->codec_tag != 0) { // In case of Smacker v4 we have three modes
424 if(get_bits1(&gb)) mode = 1;
425 else if(get_bits1(&gb)) mode = 2;
427 while(run-- && blk < blocks){
428 out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
431 for(i = 0; i < 4; i++) {
432 pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
435 pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
442 pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
443 out[0] = out[1] = pix & 0xFF;
444 out[2] = out[3] = pix >> 8;
446 out[0] = out[1] = pix & 0xFF;
447 out[2] = out[3] = pix >> 8;
449 pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
450 out[0] = out[1] = pix & 0xFF;
451 out[2] = out[3] = pix >> 8;
453 out[0] = out[1] = pix & 0xFF;
454 out[2] = out[3] = pix >> 8;
458 for(i = 0; i < 2; i++) {
460 pix1 = smk_get_code(&gb, smk->full_tbl, smk->full_last);
461 pix2 = smk_get_code(&gb, smk->full_tbl, smk->full_last);
462 out[0] = pix1 & 0xFF; out[1] = pix1 >> 8;
463 out[2] = pix2 & 0xFF; out[3] = pix2 >> 8;
465 out[0] = pix1 & 0xFF; out[1] = pix1 >> 8;
466 out[2] = pix2 & 0xFF; out[3] = pix2 >> 8;
475 while(run-- && blk < blocks)
480 while(run-- && blk < blocks){
482 out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
483 col = mode * 0x01010101;
484 for(i = 0; i < 4; i++) {
485 *((uint32_t*)out) = col;
495 *data_size = sizeof(AVFrame);
496 *(AVFrame*)data = smk->pic;
498 /* always report that the buffer was completely consumed */
506 * Init smacker decoder
509 static int decode_init(AVCodecContext *avctx)
511 SmackVContext * const c = (SmackVContext *)avctx->priv_data;
514 avctx->has_b_frames = 0;
516 c->pic.data[0] = NULL;
518 if (avcodec_check_dimensions(avctx, avctx->height, avctx->width) < 0) {
522 avctx->pix_fmt = PIX_FMT_PAL8;
525 /* decode huffman trees from extradata */
526 if(avctx->extradata_size < 16){
527 av_log(avctx, AV_LOG_ERROR, "Extradata missing!\n");
531 decode_header_trees(c);
541 * Uninit smacker decoder
544 static int decode_end(AVCodecContext *avctx)
546 SmackVContext * const smk = (SmackVContext *)avctx->priv_data;
549 av_free(smk->mmap_tbl);
551 av_free(smk->mclr_tbl);
553 av_free(smk->full_tbl);
555 av_free(smk->type_tbl);
557 if (smk->pic.data[0])
558 avctx->release_buffer(avctx, &smk->pic);
564 static int smka_decode_init(AVCodecContext *avctx)
570 * Decode Smacker audio data
572 static int smka_decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
577 int16_t *samples = data;
582 int pred[2] = {0, 0};
584 unp_size = LE_32(buf);
586 init_get_bits(&gb, buf + 4, (buf_size - 4) * 8);
589 av_log(avctx, AV_LOG_INFO, "Sound: no data\n");
593 stereo = get_bits1(&gb);
594 bits = get_bits1(&gb);
596 memset(vlc, 0, sizeof(VLC) * 4);
597 memset(h, 0, sizeof(HuffContext) * 4);
599 for(i = 0; i < (1 << (bits + stereo)); i++) {
603 h[i].bits = av_mallocz(256 * 4);
604 h[i].lengths = av_mallocz(256 * sizeof(int));
605 h[i].values = av_mallocz(256 * sizeof(int));
607 smacker_decode_tree(&gb, &h[i], 0, 0);
609 res = init_vlc(&vlc[i], SMKTREE_BITS, h[i].length,
610 h[i].lengths, sizeof(int), sizeof(int),
611 h[i].bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
613 av_log(avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
617 if(bits) { //decode 16-bit data
618 pred[0] = get_bits(&gb, 8);
619 pred[0] |= get_bits(&gb, 8);
621 pred[1] = get_bits(&gb, 8);
622 pred[1] |= get_bits(&gb, 8);
624 for(i = 0; i < unp_size / 2; i++) {
626 val = h[2].values[get_vlc2(&gb, vlc[2].table, SMKTREE_BITS, 3)];
627 val |= (int8_t)h[3].values[get_vlc2(&gb, vlc[3].table, SMKTREE_BITS, 3)] << 8;
629 *samples++ = pred[1];
631 val = h[0].values[get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3)];
632 val |= (int8_t)h[1].values[get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3)] << 8;
634 *samples++ = pred[0];
637 } else { //8-bit data
638 pred[0] = get_bits(&gb, 8);
640 pred[1] = get_bits(&gb, 8);
641 for(i = 0; i < unp_size; i++) {
643 pred[1] += (int8_t)h[1].values[get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3)];
644 *samples++ = (pred[1] - 0x80) << 8;
646 pred[0] += (int8_t)h[0].values[get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3)];
647 *samples++ = (pred[0] - 0x80) << 8;
653 for(i = 0; i < 4; i++) {
659 av_free(h[i].lengths);
661 av_free(h[i].values);
664 *data_size = unp_size;
668 AVCodec smacker_decoder = {
672 sizeof(SmackVContext),
679 AVCodec smackaud_decoder = {