3 * Copyright (c) 2006 Konstantin Shishkov
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
28 * Based on http://wiki.multimedia.cx/index.php?title=Smacker
34 #include "libavutil/channel_layout.h"
39 #define BITSTREAM_READER_LE
41 #include "bytestream.h"
43 #define SMKTREE_BITS 9
44 #define SMK_NODE 0x80000000
49 typedef struct SmackVContext {
50 AVCodecContext *avctx;
53 int *mmap_tbl, *mclr_tbl, *full_tbl, *type_tbl;
54 int mmap_last[3], mclr_last[3], full_last[3], type_last[3];
58 * Context used for code reconstructing
60 typedef struct HuffContext {
69 /* common parameters used for decode_bigtree */
70 typedef struct DBCtx {
72 int *recode1, *recode2;
78 /* possible runs of blocks */
79 static const int block_runs[64] = {
80 1, 2, 3, 4, 5, 6, 7, 8,
81 9, 10, 11, 12, 13, 14, 15, 16,
82 17, 18, 19, 20, 21, 22, 23, 24,
83 25, 26, 27, 28, 29, 30, 31, 32,
84 33, 34, 35, 36, 37, 38, 39, 40,
85 41, 42, 43, 44, 45, 46, 47, 48,
86 49, 50, 51, 52, 53, 54, 55, 56,
87 57, 58, 59, 128, 256, 512, 1024, 2048 };
96 * Decode local frame tree
98 static int smacker_decode_tree(GetBitContext *gb, HuffContext *hc, uint32_t prefix, int length)
100 if(!get_bits1(gb)){ //Leaf
101 if(hc->current >= 256){
102 av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");
106 hc->bits[hc->current] = prefix;
107 hc->lengths[hc->current] = length;
109 hc->bits[hc->current] = 0;
110 hc->lengths[hc->current] = 0;
112 hc->values[hc->current] = get_bits(gb, 8);
114 if(hc->maxlength < length)
115 hc->maxlength = length;
120 r = smacker_decode_tree(gb, hc, prefix, length);
123 return smacker_decode_tree(gb, hc, prefix | (1 << (length - 1)), length);
130 static int smacker_decode_bigtree(GetBitContext *gb, HuffContext *hc, DBCtx *ctx)
132 if (hc->current + 1 >= hc->length) {
133 av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");
136 if(!get_bits1(gb)){ //Leaf
138 i1 = ctx->v1->table ? get_vlc2(gb, ctx->v1->table, SMKTREE_BITS, 3) : 0;
139 i2 = ctx->v2->table ? get_vlc2(gb, ctx->v2->table, SMKTREE_BITS, 3) : 0;
140 if (i1 < 0 || i2 < 0)
142 val = ctx->recode1[i1] | (ctx->recode2[i2] << 8);
143 if(val == ctx->escapes[0]) {
144 ctx->last[0] = hc->current;
146 } else if(val == ctx->escapes[1]) {
147 ctx->last[1] = hc->current;
149 } else if(val == ctx->escapes[2]) {
150 ctx->last[2] = hc->current;
154 hc->values[hc->current++] = val;
160 r = smacker_decode_bigtree(gb, hc, ctx);
163 hc->values[t] = SMK_NODE | r;
165 r_new = smacker_decode_bigtree(gb, hc, ctx);
173 * Store large tree as Libav's vlc codes
175 static int smacker_decode_header_tree(SmackVContext *smk, GetBitContext *gb, int **recodes, int *last, int size)
179 HuffContext tmp1, tmp2;
180 VLC vlc[2] = { { 0 } };
185 if(size >= UINT_MAX>>4){ // (((size + 3) >> 2) + 3) << 2 must not overflow
186 av_log(smk->avctx, AV_LOG_ERROR, "size too large\n");
193 tmp1.bits = av_mallocz(256 * 4);
194 tmp1.lengths = av_mallocz(256 * sizeof(int));
195 tmp1.values = av_mallocz(256 * sizeof(int));
200 tmp2.bits = av_mallocz(256 * 4);
201 tmp2.lengths = av_mallocz(256 * sizeof(int));
202 tmp2.values = av_mallocz(256 * sizeof(int));
205 smacker_decode_tree(gb, &tmp1, 0, 0);
207 res = init_vlc(&vlc[0], SMKTREE_BITS, tmp1.length,
208 tmp1.lengths, sizeof(int), sizeof(int),
209 tmp1.bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
211 av_log(smk->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
215 av_log(smk->avctx, AV_LOG_ERROR, "Skipping low bytes tree\n");
218 smacker_decode_tree(gb, &tmp2, 0, 0);
220 res = init_vlc(&vlc[1], SMKTREE_BITS, tmp2.length,
221 tmp2.lengths, sizeof(int), sizeof(int),
222 tmp2.bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
224 av_log(smk->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
228 av_log(smk->avctx, AV_LOG_ERROR, "Skipping high bytes tree\n");
231 escapes[0] = get_bits(gb, 8);
232 escapes[0] |= get_bits(gb, 8) << 8;
233 escapes[1] = get_bits(gb, 8);
234 escapes[1] |= get_bits(gb, 8) << 8;
235 escapes[2] = get_bits(gb, 8);
236 escapes[2] |= get_bits(gb, 8) << 8;
238 last[0] = last[1] = last[2] = -1;
240 ctx.escapes[0] = escapes[0];
241 ctx.escapes[1] = escapes[1];
242 ctx.escapes[2] = escapes[2];
245 ctx.recode1 = tmp1.values;
246 ctx.recode2 = tmp2.values;
249 huff.length = ((size + 3) >> 2) + 4;
252 huff.values = av_mallocz(huff.length * sizeof(int));
254 if (smacker_decode_bigtree(gb, &huff, &ctx) < 0)
257 if(ctx.last[0] == -1) ctx.last[0] = huff.current++;
258 if(ctx.last[1] == -1) ctx.last[1] = huff.current++;
259 if(ctx.last[2] == -1) ctx.last[2] = huff.current++;
261 *recodes = huff.values;
264 ff_free_vlc(&vlc[0]);
266 ff_free_vlc(&vlc[1]);
268 av_free(tmp1.lengths);
269 av_free(tmp1.values);
271 av_free(tmp2.lengths);
272 av_free(tmp2.values);
277 static int decode_header_trees(SmackVContext *smk) {
279 int mmap_size, mclr_size, full_size, type_size;
281 mmap_size = AV_RL32(smk->avctx->extradata);
282 mclr_size = AV_RL32(smk->avctx->extradata + 4);
283 full_size = AV_RL32(smk->avctx->extradata + 8);
284 type_size = AV_RL32(smk->avctx->extradata + 12);
286 init_get_bits(&gb, smk->avctx->extradata + 16, (smk->avctx->extradata_size - 16) * 8);
288 if(!get_bits1(&gb)) {
289 av_log(smk->avctx, AV_LOG_INFO, "Skipping MMAP tree\n");
290 smk->mmap_tbl = av_malloc(sizeof(int) * 2);
291 smk->mmap_tbl[0] = 0;
292 smk->mmap_last[0] = smk->mmap_last[1] = smk->mmap_last[2] = 1;
294 if (smacker_decode_header_tree(smk, &gb, &smk->mmap_tbl, smk->mmap_last, mmap_size))
297 if(!get_bits1(&gb)) {
298 av_log(smk->avctx, AV_LOG_INFO, "Skipping MCLR tree\n");
299 smk->mclr_tbl = av_malloc(sizeof(int) * 2);
300 smk->mclr_tbl[0] = 0;
301 smk->mclr_last[0] = smk->mclr_last[1] = smk->mclr_last[2] = 1;
303 if (smacker_decode_header_tree(smk, &gb, &smk->mclr_tbl, smk->mclr_last, mclr_size))
306 if(!get_bits1(&gb)) {
307 av_log(smk->avctx, AV_LOG_INFO, "Skipping FULL tree\n");
308 smk->full_tbl = av_malloc(sizeof(int) * 2);
309 smk->full_tbl[0] = 0;
310 smk->full_last[0] = smk->full_last[1] = smk->full_last[2] = 1;
312 if (smacker_decode_header_tree(smk, &gb, &smk->full_tbl, smk->full_last, full_size))
315 if(!get_bits1(&gb)) {
316 av_log(smk->avctx, AV_LOG_INFO, "Skipping TYPE tree\n");
317 smk->type_tbl = av_malloc(sizeof(int) * 2);
318 smk->type_tbl[0] = 0;
319 smk->type_last[0] = smk->type_last[1] = smk->type_last[2] = 1;
321 if (smacker_decode_header_tree(smk, &gb, &smk->type_tbl, smk->type_last, type_size))
328 static av_always_inline void last_reset(int *recode, int *last) {
329 recode[last[0]] = recode[last[1]] = recode[last[2]] = 0;
332 /* get code and update history */
333 static av_always_inline int smk_get_code(GetBitContext *gb, int *recode, int *last) {
334 register int *table = recode;
337 while(*table & SMK_NODE) {
339 table += (*table) & (~SMK_NODE);
344 if(v != recode[last[0]]) {
345 recode[last[2]] = recode[last[1]];
346 recode[last[1]] = recode[last[0]];
352 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
355 SmackVContext * const smk = avctx->priv_data;
360 int blocks, blk, bw, bh;
365 if (avpkt->size <= 769)
368 if ((ret = ff_reget_buffer(avctx, &smk->pic)) < 0) {
369 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
373 /* make the palette available on the way out */
374 pal = (uint32_t*)smk->pic.data[1];
375 bytestream2_init(&gb2, avpkt->data, avpkt->size);
376 flags = bytestream2_get_byteu(&gb2);
377 smk->pic.palette_has_changed = flags & 1;
378 smk->pic.key_frame = !!(flags & 2);
379 if(smk->pic.key_frame)
380 smk->pic.pict_type = AV_PICTURE_TYPE_I;
382 smk->pic.pict_type = AV_PICTURE_TYPE_P;
384 for(i = 0; i < 256; i++)
385 *pal++ = bytestream2_get_be24u(&gb2);
387 last_reset(smk->mmap_tbl, smk->mmap_last);
388 last_reset(smk->mclr_tbl, smk->mclr_last);
389 last_reset(smk->full_tbl, smk->full_last);
390 last_reset(smk->type_tbl, smk->type_last);
391 init_get_bits(&gb, avpkt->data + 769, (avpkt->size - 769) * 8);
394 bw = avctx->width >> 2;
395 bh = avctx->height >> 2;
397 out = smk->pic.data[0];
398 stride = smk->pic.linesize[0];
399 while(blk < blocks) {
403 type = smk_get_code(&gb, smk->type_tbl, smk->type_last);
404 run = block_runs[(type >> 2) & 0x3F];
407 while(run-- && blk < blocks){
410 clr = smk_get_code(&gb, smk->mclr_tbl, smk->mclr_last);
411 map = smk_get_code(&gb, smk->mmap_tbl, smk->mmap_last);
412 out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
415 for(i = 0; i < 4; i++) {
416 if(map & 1) out[0] = hi; else out[0] = lo;
417 if(map & 2) out[1] = hi; else out[1] = lo;
418 if(map & 4) out[2] = hi; else out[2] = lo;
419 if(map & 8) out[3] = hi; else out[3] = lo;
428 if(avctx->codec_tag == MKTAG('S', 'M', 'K', '4')) { // In case of Smacker v4 we have three modes
429 if(get_bits1(&gb)) mode = 1;
430 else if(get_bits1(&gb)) mode = 2;
432 while(run-- && blk < blocks){
433 out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
436 for(i = 0; i < 4; i++) {
437 pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
439 pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
445 pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
446 out[0] = out[1] = pix & 0xFF;
447 out[2] = out[3] = pix >> 8;
449 out[0] = out[1] = pix & 0xFF;
450 out[2] = out[3] = pix >> 8;
452 pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
453 out[0] = out[1] = pix & 0xFF;
454 out[2] = out[3] = pix >> 8;
456 out[0] = out[1] = pix & 0xFF;
457 out[2] = out[3] = pix >> 8;
461 for(i = 0; i < 2; i++) {
463 pix2 = smk_get_code(&gb, smk->full_tbl, smk->full_last);
464 pix1 = smk_get_code(&gb, smk->full_tbl, smk->full_last);
478 while(run-- && blk < blocks)
483 while(run-- && blk < blocks){
485 out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
486 col = mode * 0x01010101;
487 for(i = 0; i < 4; i++) {
488 *((uint32_t*)out) = col;
498 if ((ret = av_frame_ref(data, &smk->pic)) < 0)
503 /* always report that the buffer was completely consumed */
511 * Init smacker decoder
514 static av_cold int decode_init(AVCodecContext *avctx)
516 SmackVContext * const c = avctx->priv_data;
520 avctx->pix_fmt = AV_PIX_FMT_PAL8;
521 avcodec_get_frame_defaults(&c->pic);
523 /* decode huffman trees from extradata */
524 if(avctx->extradata_size < 16){
525 av_log(avctx, AV_LOG_ERROR, "Extradata missing!\n");
529 if (decode_header_trees(c))
539 * Uninit smacker decoder
542 static av_cold int decode_end(AVCodecContext *avctx)
544 SmackVContext * const smk = avctx->priv_data;
546 av_freep(&smk->mmap_tbl);
547 av_freep(&smk->mclr_tbl);
548 av_freep(&smk->full_tbl);
549 av_freep(&smk->type_tbl);
551 av_frame_unref(&smk->pic);
557 static av_cold int smka_decode_init(AVCodecContext *avctx)
559 if (avctx->channels < 1 || avctx->channels > 2) {
560 av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n");
561 return AVERROR(EINVAL);
563 avctx->channel_layout = (avctx->channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
564 avctx->sample_fmt = avctx->bits_per_coded_sample == 8 ? AV_SAMPLE_FMT_U8 : AV_SAMPLE_FMT_S16;
570 * Decode Smacker audio data
572 static int smka_decode_frame(AVCodecContext *avctx, void *data,
573 int *got_frame_ptr, AVPacket *avpkt)
575 AVFrame *frame = data;
576 const uint8_t *buf = avpkt->data;
577 int buf_size = avpkt->size;
579 HuffContext h[4] = { { 0 } };
580 VLC vlc[4] = { { 0 } };
587 int pred[2] = {0, 0};
590 av_log(avctx, AV_LOG_ERROR, "packet is too small\n");
591 return AVERROR(EINVAL);
594 unp_size = AV_RL32(buf);
596 init_get_bits(&gb, buf + 4, (buf_size - 4) * 8);
599 av_log(avctx, AV_LOG_INFO, "Sound: no data\n");
603 stereo = get_bits1(&gb);
604 bits = get_bits1(&gb);
605 if (stereo ^ (avctx->channels != 1)) {
606 av_log(avctx, AV_LOG_ERROR, "channels mismatch\n");
607 return AVERROR(EINVAL);
609 if (bits && avctx->sample_fmt == AV_SAMPLE_FMT_U8) {
610 av_log(avctx, AV_LOG_ERROR, "sample format mismatch\n");
611 return AVERROR(EINVAL);
614 /* get output buffer */
615 frame->nb_samples = unp_size / (avctx->channels * (bits + 1));
616 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
617 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
620 samples = (int16_t *)frame->data[0];
621 samples8 = frame->data[0];
624 for(i = 0; i < (1 << (bits + stereo)); i++) {
628 h[i].bits = av_mallocz(256 * 4);
629 h[i].lengths = av_mallocz(256 * sizeof(int));
630 h[i].values = av_mallocz(256 * sizeof(int));
632 if (smacker_decode_tree(&gb, &h[i], 0, 0) < 0) {
633 for (; i >= 0; i--) {
635 ff_free_vlc(&vlc[i]);
637 av_free(h[i].lengths);
638 av_free(h[i].values);
640 return AVERROR_INVALIDDATA;
643 if(h[i].current > 1) {
644 res = init_vlc(&vlc[i], SMKTREE_BITS, h[i].length,
645 h[i].lengths, sizeof(int), sizeof(int),
646 h[i].bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
648 av_log(avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
653 /* this codec relies on wraparound instead of clipping audio */
654 if(bits) { //decode 16-bit data
655 for(i = stereo; i >= 0; i--)
656 pred[i] = sign_extend(av_bswap16(get_bits(&gb, 16)), 16);
657 for(i = 0; i <= stereo; i++)
658 *samples++ = pred[i];
659 for(; i < unp_size / 2; i++) {
662 res = get_vlc2(&gb, vlc[2].table, SMKTREE_BITS, 3);
665 val = h[2].values[res];
667 res = get_vlc2(&gb, vlc[3].table, SMKTREE_BITS, 3);
670 val |= h[3].values[res] << 8;
671 pred[1] += sign_extend(val, 16);
672 *samples++ = pred[1];
675 res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3);
678 val = h[0].values[res];
680 res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3);
683 val |= h[1].values[res] << 8;
684 pred[0] += sign_extend(val, 16);
685 *samples++ = pred[0];
688 } else { //8-bit data
689 for(i = stereo; i >= 0; i--)
690 pred[i] = get_bits(&gb, 8);
691 for(i = 0; i <= stereo; i++)
692 *samples8++ = pred[i];
693 for(; i < unp_size; i++) {
696 res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3);
699 pred[1] += sign_extend(h[1].values[res], 8);
700 *samples8++ = pred[1];
703 res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3);
706 pred[0] += sign_extend(h[0].values[res], 8);
707 *samples8++ = pred[0];
712 for(i = 0; i < 4; i++) {
714 ff_free_vlc(&vlc[i]);
716 av_free(h[i].lengths);
717 av_free(h[i].values);
725 AVCodec ff_smacker_decoder = {
727 .type = AVMEDIA_TYPE_VIDEO,
728 .id = AV_CODEC_ID_SMACKVIDEO,
729 .priv_data_size = sizeof(SmackVContext),
732 .decode = decode_frame,
733 .capabilities = CODEC_CAP_DR1,
734 .long_name = NULL_IF_CONFIG_SMALL("Smacker video"),
737 AVCodec ff_smackaud_decoder = {
739 .type = AVMEDIA_TYPE_AUDIO,
740 .id = AV_CODEC_ID_SMACKAUDIO,
741 .init = smka_decode_init,
742 .decode = smka_decode_frame,
743 .capabilities = CODEC_CAP_DR1,
744 .long_name = NULL_IF_CONFIG_SMALL("Smacker audio"),