/* * Smacker decoder * Copyright (c) 2006 Konstantin Shishkov * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file libavcodec/smacker.c * Smacker decoder */ /* * Based on http://wiki.multimedia.cx/index.php?title=Smacker */ #include #include #include "avcodec.h" #define ALT_BITSTREAM_READER_LE #include "bitstream.h" #include "bytestream.h" #define SMKTREE_BITS 9 #define SMK_NODE 0x80000000 /* * Decoder context */ typedef struct SmackVContext { AVCodecContext *avctx; AVFrame pic; int *mmap_tbl, *mclr_tbl, *full_tbl, *type_tbl; int mmap_last[3], mclr_last[3], full_last[3], type_last[3]; } SmackVContext; /** * Context used for code reconstructing */ typedef struct HuffContext { int length; int maxlength; int current; uint32_t *bits; int *lengths; int *values; } HuffContext; /* common parameters used for decode_bigtree */ typedef struct DBCtx { VLC *v1, *v2; int *recode1, *recode2; int escapes[3]; int *last; int lcur; } DBCtx; /* possible runs of blocks */ static const int block_runs[64] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 128, 256, 512, 1024, 2048 }; enum SmkBlockTypes { SMK_BLK_MONO = 0, SMK_BLK_FULL = 1, SMK_BLK_SKIP = 2, SMK_BLK_FILL = 3 }; /** * Decode local frame tree */ static int smacker_decode_tree(GetBitContext *gb, HuffContext *hc, uint32_t prefix, int length) { if(!get_bits1(gb)){ //Leaf if(hc->current >= 256){ av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n"); return -1; } if(length){ hc->bits[hc->current] = prefix; hc->lengths[hc->current] = length; } else { hc->bits[hc->current] = 0; hc->lengths[hc->current] = 0; } hc->values[hc->current] = get_bits(gb, 8); hc->current++; if(hc->maxlength < length) hc->maxlength = length; return 0; } else { //Node int r; length++; r = smacker_decode_tree(gb, hc, prefix, length); if(r) return r; return smacker_decode_tree(gb, hc, prefix | (1 << (length - 1)), length); } } /** * Decode header tree */ static int smacker_decode_bigtree(GetBitContext *gb, HuffContext *hc, DBCtx *ctx) { if(!get_bits1(gb)){ //Leaf int val, i1, i2, b1, b2; if(hc->current >= hc->length){ av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n"); return -1; } b1 = get_bits_count(gb); i1 = get_vlc2(gb, ctx->v1->table, SMKTREE_BITS, 3); b1 = get_bits_count(gb) - b1; b2 = get_bits_count(gb); i2 = get_vlc2(gb, ctx->v2->table, SMKTREE_BITS, 3); b2 = get_bits_count(gb) - b2; val = ctx->recode1[i1] | (ctx->recode2[i2] << 8); if(val == ctx->escapes[0]) { ctx->last[0] = hc->current; val = 0; } else if(val == ctx->escapes[1]) { ctx->last[1] = hc->current; val = 0; } else if(val == ctx->escapes[2]) { ctx->last[2] = hc->current; val = 0; } hc->values[hc->current++] = val; return 1; } else { //Node int r = 0, t; t = hc->current++; r = smacker_decode_bigtree(gb, hc, ctx); if(r < 0) return r; hc->values[t] = SMK_NODE | r; r++; r += smacker_decode_bigtree(gb, hc, ctx); return r; } } /** * Store large tree as FFmpeg's vlc codes */ static int smacker_decode_header_tree(SmackVContext *smk, GetBitContext *gb, int **recodes, int *last, int size) { int res; HuffContext huff; HuffContext tmp1, tmp2; VLC vlc[2]; int escapes[3]; DBCtx ctx; if(size >= UINT_MAX>>4){ // (((size + 3) >> 2) + 3) << 2 must not overflow av_log(smk->avctx, AV_LOG_ERROR, "size too large\n"); return -1; } tmp1.length = 256; tmp1.maxlength = 0; tmp1.current = 0; tmp1.bits = av_mallocz(256 * 4); tmp1.lengths = av_mallocz(256 * sizeof(int)); tmp1.values = av_mallocz(256 * sizeof(int)); tmp2.length = 256; tmp2.maxlength = 0; tmp2.current = 0; tmp2.bits = av_mallocz(256 * 4); tmp2.lengths = av_mallocz(256 * sizeof(int)); tmp2.values = av_mallocz(256 * sizeof(int)); memset(&vlc[0], 0, sizeof(VLC)); memset(&vlc[1], 0, sizeof(VLC)); if(get_bits1(gb)) { smacker_decode_tree(gb, &tmp1, 0, 0); skip_bits1(gb); res = init_vlc(&vlc[0], SMKTREE_BITS, tmp1.length, tmp1.lengths, sizeof(int), sizeof(int), tmp1.bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE); if(res < 0) { av_log(smk->avctx, AV_LOG_ERROR, "Cannot build VLC table\n"); return -1; } } else { av_log(smk->avctx, AV_LOG_ERROR, "Skipping low bytes tree\n"); } if(get_bits1(gb)){ smacker_decode_tree(gb, &tmp2, 0, 0); skip_bits1(gb); res = init_vlc(&vlc[1], SMKTREE_BITS, tmp2.length, tmp2.lengths, sizeof(int), sizeof(int), tmp2.bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE); if(res < 0) { av_log(smk->avctx, AV_LOG_ERROR, "Cannot build VLC table\n"); return -1; } } else { av_log(smk->avctx, AV_LOG_ERROR, "Skipping high bytes tree\n"); } escapes[0] = get_bits(gb, 8); escapes[0] |= get_bits(gb, 8) << 8; escapes[1] = get_bits(gb, 8); escapes[1] |= get_bits(gb, 8) << 8; escapes[2] = get_bits(gb, 8); escapes[2] |= get_bits(gb, 8) << 8; last[0] = last[1] = last[2] = -1; ctx.escapes[0] = escapes[0]; ctx.escapes[1] = escapes[1]; ctx.escapes[2] = escapes[2]; ctx.v1 = &vlc[0]; ctx.v2 = &vlc[1]; ctx.recode1 = tmp1.values; ctx.recode2 = tmp2.values; ctx.last = last; huff.length = ((size + 3) >> 2) + 3; huff.maxlength = 0; huff.current = 0; huff.values = av_mallocz(huff.length * sizeof(int)); smacker_decode_bigtree(gb, &huff, &ctx); skip_bits1(gb); if(ctx.last[0] == -1) ctx.last[0] = huff.current++; if(ctx.last[1] == -1) ctx.last[1] = huff.current++; if(ctx.last[2] == -1) ctx.last[2] = huff.current++; *recodes = huff.values; if(vlc[0].table) free_vlc(&vlc[0]); if(vlc[1].table) free_vlc(&vlc[1]); av_free(tmp1.bits); av_free(tmp1.lengths); av_free(tmp1.values); av_free(tmp2.bits); av_free(tmp2.lengths); av_free(tmp2.values); return 0; } static int decode_header_trees(SmackVContext *smk) { GetBitContext gb; int mmap_size, mclr_size, full_size, type_size; mmap_size = AV_RL32(smk->avctx->extradata); mclr_size = AV_RL32(smk->avctx->extradata + 4); full_size = AV_RL32(smk->avctx->extradata + 8); type_size = AV_RL32(smk->avctx->extradata + 12); init_get_bits(&gb, smk->avctx->extradata + 16, (smk->avctx->extradata_size - 16) * 8); if(!get_bits1(&gb)) { av_log(smk->avctx, AV_LOG_INFO, "Skipping MMAP tree\n"); smk->mmap_tbl = av_malloc(sizeof(int) * 2); smk->mmap_tbl[0] = 0; smk->mmap_last[0] = smk->mmap_last[1] = smk->mmap_last[2] = 1; } else { smacker_decode_header_tree(smk, &gb, &smk->mmap_tbl, smk->mmap_last, mmap_size); } if(!get_bits1(&gb)) { av_log(smk->avctx, AV_LOG_INFO, "Skipping MCLR tree\n"); smk->mclr_tbl = av_malloc(sizeof(int) * 2); smk->mclr_tbl[0] = 0; smk->mclr_last[0] = smk->mclr_last[1] = smk->mclr_last[2] = 1; } else { smacker_decode_header_tree(smk, &gb, &smk->mclr_tbl, smk->mclr_last, mclr_size); } if(!get_bits1(&gb)) { av_log(smk->avctx, AV_LOG_INFO, "Skipping FULL tree\n"); smk->full_tbl = av_malloc(sizeof(int) * 2); smk->full_tbl[0] = 0; smk->full_last[0] = smk->full_last[1] = smk->full_last[2] = 1; } else { smacker_decode_header_tree(smk, &gb, &smk->full_tbl, smk->full_last, full_size); } if(!get_bits1(&gb)) { av_log(smk->avctx, AV_LOG_INFO, "Skipping TYPE tree\n"); smk->type_tbl = av_malloc(sizeof(int) * 2); smk->type_tbl[0] = 0; smk->type_last[0] = smk->type_last[1] = smk->type_last[2] = 1; } else { smacker_decode_header_tree(smk, &gb, &smk->type_tbl, smk->type_last, type_size); } return 0; } static av_always_inline void last_reset(int *recode, int *last) { recode[last[0]] = recode[last[1]] = recode[last[2]] = 0; } /* get code and update history */ static av_always_inline int smk_get_code(GetBitContext *gb, int *recode, int *last) { register int *table = recode; int v, b; b = get_bits_count(gb); while(*table & SMK_NODE) { if(get_bits1(gb)) table += (*table) & (~SMK_NODE); table++; } v = *table; b = get_bits_count(gb) - b; if(v != recode[last[0]]) { recode[last[2]] = recode[last[1]]; recode[last[1]] = recode[last[0]]; recode[last[0]] = v; } return v; } static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, const uint8_t *buf, int buf_size) { SmackVContext * const smk = avctx->priv_data; uint8_t *out; uint32_t *pal; GetBitContext gb; int blocks, blk, bw, bh; int i; int stride; if(buf_size <= 769) return 0; if(smk->pic.data[0]) avctx->release_buffer(avctx, &smk->pic); smk->pic.reference = 1; smk->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE; if(avctx->reget_buffer(avctx, &smk->pic) < 0){ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return -1; } /* make the palette available on the way out */ pal = (uint32_t*)smk->pic.data[1]; smk->pic.palette_has_changed = buf[0] & 1; smk->pic.key_frame = !!(buf[0] & 2); if(smk->pic.key_frame) smk->pic.pict_type = FF_I_TYPE; else smk->pic.pict_type = FF_P_TYPE; buf++; for(i = 0; i < 256; i++) *pal++ = bytestream_get_be24(&buf); buf_size -= 769; last_reset(smk->mmap_tbl, smk->mmap_last); last_reset(smk->mclr_tbl, smk->mclr_last); last_reset(smk->full_tbl, smk->full_last); last_reset(smk->type_tbl, smk->type_last); init_get_bits(&gb, buf, buf_size * 8); blk = 0; bw = avctx->width >> 2; bh = avctx->height >> 2; blocks = bw * bh; out = smk->pic.data[0]; stride = smk->pic.linesize[0]; while(blk < blocks) { int type, run, mode; uint16_t pix; type = smk_get_code(&gb, smk->type_tbl, smk->type_last); run = block_runs[(type >> 2) & 0x3F]; switch(type & 3){ case SMK_BLK_MONO: while(run-- && blk < blocks){ int clr, map; int hi, lo; clr = smk_get_code(&gb, smk->mclr_tbl, smk->mclr_last); map = smk_get_code(&gb, smk->mmap_tbl, smk->mmap_last); out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4; hi = clr >> 8; lo = clr & 0xFF; for(i = 0; i < 4; i++) { if(map & 1) out[0] = hi; else out[0] = lo; if(map & 2) out[1] = hi; else out[1] = lo; if(map & 4) out[2] = hi; else out[2] = lo; if(map & 8) out[3] = hi; else out[3] = lo; map >>= 4; out += stride; } blk++; } break; case SMK_BLK_FULL: mode = 0; if(avctx->codec_tag == MKTAG('S', 'M', 'K', '4')) { // In case of Smacker v4 we have three modes if(get_bits1(&gb)) mode = 1; else if(get_bits1(&gb)) mode = 2; } while(run-- && blk < blocks){ out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4; switch(mode){ case 0: for(i = 0; i < 4; i++) { pix = smk_get_code(&gb, smk->full_tbl, smk->full_last); AV_WL16(out+2,pix); pix = smk_get_code(&gb, smk->full_tbl, smk->full_last); AV_WL16(out,pix); out += stride; } break; case 1: pix = smk_get_code(&gb, smk->full_tbl, smk->full_last); out[0] = out[1] = pix & 0xFF; out[2] = out[3] = pix >> 8; out += stride; out[0] = out[1] = pix & 0xFF; out[2] = out[3] = pix >> 8; out += stride; pix = smk_get_code(&gb, smk->full_tbl, smk->full_last); out[0] = out[1] = pix & 0xFF; out[2] = out[3] = pix >> 8; out += stride; out[0] = out[1] = pix & 0xFF; out[2] = out[3] = pix >> 8; out += stride; break; case 2: for(i = 0; i < 2; i++) { uint16_t pix1, pix2; pix2 = smk_get_code(&gb, smk->full_tbl, smk->full_last); pix1 = smk_get_code(&gb, smk->full_tbl, smk->full_last); AV_WL16(out,pix1); AV_WL16(out+2,pix2); out += stride; AV_WL16(out,pix1); AV_WL16(out+2,pix2); out += stride; } break; } blk++; } break; case SMK_BLK_SKIP: while(run-- && blk < blocks) blk++; break; case SMK_BLK_FILL: mode = type >> 8; while(run-- && blk < blocks){ uint32_t col; out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4; col = mode * 0x01010101; for(i = 0; i < 4; i++) { *((uint32_t*)out) = col; out += stride; } blk++; } break; } } *data_size = sizeof(AVFrame); *(AVFrame*)data = smk->pic; /* always report that the buffer was completely consumed */ return buf_size; } /* * * Init smacker decoder * */ static av_cold int decode_init(AVCodecContext *avctx) { SmackVContext * const c = avctx->priv_data; c->avctx = avctx; c->pic.data[0] = NULL; if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) { return 1; } avctx->pix_fmt = PIX_FMT_PAL8; /* decode huffman trees from extradata */ if(avctx->extradata_size < 16){ av_log(avctx, AV_LOG_ERROR, "Extradata missing!\n"); return -1; } decode_header_trees(c); return 0; } /* * * Uninit smacker decoder * */ static av_cold int decode_end(AVCodecContext *avctx) { SmackVContext * const smk = avctx->priv_data; av_freep(&smk->mmap_tbl); av_freep(&smk->mclr_tbl); av_freep(&smk->full_tbl); av_freep(&smk->type_tbl); if (smk->pic.data[0]) avctx->release_buffer(avctx, &smk->pic); return 0; } static av_cold int smka_decode_init(AVCodecContext *avctx) { avctx->sample_fmt = SAMPLE_FMT_S16; avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO; return 0; } /** * Decode Smacker audio data */ static int smka_decode_frame(AVCodecContext *avctx, void *data, int *data_size, const uint8_t *buf, int buf_size) { GetBitContext gb; HuffContext h[4]; VLC vlc[4]; int16_t *samples = data; int val; int i, res; int unp_size; int bits, stereo; int pred[2] = {0, 0}; unp_size = AV_RL32(buf); init_get_bits(&gb, buf + 4, (buf_size - 4) * 8); if(!get_bits1(&gb)){ av_log(avctx, AV_LOG_INFO, "Sound: no data\n"); *data_size = 0; return 1; } stereo = get_bits1(&gb); bits = get_bits1(&gb); if (unp_size & 0xC0000000 || (unp_size << !bits) > *data_size) { av_log(avctx, AV_LOG_ERROR, "Frame is too large to fit in buffer\n"); return -1; } memset(vlc, 0, sizeof(VLC) * 4); memset(h, 0, sizeof(HuffContext) * 4); // Initialize for(i = 0; i < (1 << (bits + stereo)); i++) { h[i].length = 256; h[i].maxlength = 0; h[i].current = 0; h[i].bits = av_mallocz(256 * 4); h[i].lengths = av_mallocz(256 * sizeof(int)); h[i].values = av_mallocz(256 * sizeof(int)); skip_bits1(&gb); smacker_decode_tree(&gb, &h[i], 0, 0); skip_bits1(&gb); if(h[i].current > 1) { res = init_vlc(&vlc[i], SMKTREE_BITS, h[i].length, h[i].lengths, sizeof(int), sizeof(int), h[i].bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE); if(res < 0) { av_log(avctx, AV_LOG_ERROR, "Cannot build VLC table\n"); return -1; } } } if(bits) { //decode 16-bit data for(i = stereo; i >= 0; i--) pred[i] = bswap_16(get_bits(&gb, 16)); for(i = 0; i < stereo; i++) *samples++ = pred[i]; for(i = 0; i < unp_size / 2; i++) { if(i & stereo) { if(vlc[2].table) res = get_vlc2(&gb, vlc[2].table, SMKTREE_BITS, 3); else res = 0; val = h[2].values[res]; if(vlc[3].table) res = get_vlc2(&gb, vlc[3].table, SMKTREE_BITS, 3); else res = 0; val |= h[3].values[res] << 8; pred[1] += (int16_t)val; *samples++ = pred[1]; } else { if(vlc[0].table) res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3); else res = 0; val = h[0].values[res]; if(vlc[1].table) res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3); else res = 0; val |= h[1].values[res] << 8; pred[0] += val; *samples++ = pred[0]; } } } else { //8-bit data for(i = stereo; i >= 0; i--) pred[i] = get_bits(&gb, 8); for(i = 0; i < stereo; i++) *samples++ = (pred[i] - 0x80) << 8; for(i = 0; i < unp_size; i++) { if(i & stereo){ if(vlc[1].table) res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3); else res = 0; pred[1] += (int8_t)h[1].values[res]; *samples++ = (pred[1] - 0x80) << 8; } else { if(vlc[0].table) res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3); else res = 0; pred[0] += (int8_t)h[0].values[res]; *samples++ = (pred[0] - 0x80) << 8; } } unp_size *= 2; } for(i = 0; i < 4; i++) { if(vlc[i].table) free_vlc(&vlc[i]); if(h[i].bits) av_free(h[i].bits); if(h[i].lengths) av_free(h[i].lengths); if(h[i].values) av_free(h[i].values); } *data_size = unp_size; return buf_size; } AVCodec smacker_decoder = { "smackvid", CODEC_TYPE_VIDEO, CODEC_ID_SMACKVIDEO, sizeof(SmackVContext), decode_init, NULL, decode_end, decode_frame, .long_name = NULL_IF_CONFIG_SMALL("Smacker video"), }; AVCodec smackaud_decoder = { "smackaud", CODEC_TYPE_AUDIO, CODEC_ID_SMACKAUDIO, 0, smka_decode_init, NULL, NULL, smka_decode_frame, .long_name = NULL_IF_CONFIG_SMALL("Smacker audio"), };