| 1 | /*
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| 2 | * Smacker decoder
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| 3 | * Copyright (c) 2006 Konstantin Shishkov.
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| 4 | *
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| 5 | * This library is free software; you can redistribute it and/or
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| 6 | * modify it under the terms of the GNU Lesser General Public
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| 7 | * License as published by the Free Software Foundation; either
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| 8 | * version 2 of the License, or (at your option) any later version.
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| 9 | *
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| 10 | * This library is distributed in the hope that it will be useful,
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| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 13 | * Lesser General Public License for more details.
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| 14 | *
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| 15 | * You should have received a copy of the GNU Lesser General Public
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| 16 | * License along with this library; if not, write to the Free Software
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| 17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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| 18 | */
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| 19 |
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| 20 | /*
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| 21 | * Based on http://wiki.multimedia.cx/index.php?title=Smacker
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| 22 | */
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| 23 |
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| 24 | #include "avformat.h"
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| 25 | #include "avi.h"
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| 26 | #include "bswap.h"
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| 27 |
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| 28 | #define SMACKER_PAL 0x01
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| 29 |
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| 30 | enum SAudFlags {
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| 31 | SMK_AUD_PACKED = 0x80000000,
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| 32 | SMK_AUD_16BITS = 0x20000000,
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| 33 | SMK_AUD_STEREO = 0x10000000,
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| 34 | SMK_AUD_BINKAUD = 0x08000000,
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| 35 | SMK_AUD_USEDCT = 0x04000000
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| 36 | };
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| 37 |
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| 38 | typedef struct SmackerContext {
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| 39 | /* Smacker file header */
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| 40 | uint32_t magic;
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| 41 | uint32_t width, height;
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| 42 | uint32_t frames;
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| 43 | int pts_inc;
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| 44 | uint32_t flags;
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| 45 | uint32_t audio[7];
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| 46 | uint32_t treesize;
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| 47 | uint32_t mmap_size, mclr_size, full_size, type_size;
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| 48 | uint32_t rates[7];
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| 49 | uint32_t pad;
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| 50 | /* frame info */
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| 51 | uint32_t *frm_size;
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| 52 | uint8_t *frm_flags;
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| 53 | /* internal variables */
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| 54 | int cur_frame;
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| 55 | int is_ver4;
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| 56 | int64_t cur_pts;
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| 57 | /* current frame for demuxing */
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| 58 | uint8_t pal[768];
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| 59 | int indexes[7];
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| 60 | int videoindex;
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| 61 | uint8_t *bufs[7];
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| 62 | int buf_sizes[7];
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| 63 | int stream_id[7];
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| 64 | int curstream;
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| 65 | offset_t nextpos;
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| 66 | int64_t aud_pts[7];
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| 67 | } SmackerContext;
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| 68 |
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| 69 | typedef struct SmackerFrame {
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| 70 | int64_t pts;
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| 71 | int stream;
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| 72 | } SmackerFrame;
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| 73 |
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| 74 | /* palette used in Smacker */
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| 75 | static const uint8_t smk_pal[64] = {
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| 76 | 0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
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| 77 | 0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
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| 78 | 0x41, 0x45, 0x49, 0x4D, 0x51, 0x55, 0x59, 0x5D,
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| 79 | 0x61, 0x65, 0x69, 0x6D, 0x71, 0x75, 0x79, 0x7D,
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| 80 | 0x82, 0x86, 0x8A, 0x8E, 0x92, 0x96, 0x9A, 0x9E,
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| 81 | 0xA2, 0xA6, 0xAA, 0xAE, 0xB2, 0xB6, 0xBA, 0xBE,
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| 82 | 0xC3, 0xC7, 0xCB, 0xCF, 0xD3, 0xD7, 0xDB, 0xDF,
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| 83 | 0xE3, 0xE7, 0xEB, 0xEF, 0xF3, 0xF7, 0xFB, 0xFF
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| 84 | };
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| 85 |
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| 86 |
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| 87 | static int smacker_probe(AVProbeData *p)
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| 88 | {
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| 89 | if (p->buf_size < 4)
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| 90 | return 0;
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| 91 | if(p->buf[0] == 'S' && p->buf[1] == 'M' && p->buf[2] == 'K'
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| 92 | && (p->buf[3] == '2' || p->buf[3] == '4'))
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| 93 | return AVPROBE_SCORE_MAX;
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| 94 | else
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| 95 | return 0;
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| 96 | }
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| 97 |
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| 98 | static int smacker_read_header(AVFormatContext *s, AVFormatParameters *ap)
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| 99 | {
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| 100 | ByteIOContext *pb = &s->pb;
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| 101 | SmackerContext *smk = (SmackerContext *)s->priv_data;
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| 102 | AVStream *st, *ast[7];
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| 103 | int i, ret;
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| 104 | int tbase;
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| 105 |
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| 106 | /* read and check header */
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| 107 | smk->magic = get_le32(pb);
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| 108 | if (smk->magic != MKTAG('S', 'M', 'K', '2') && smk->magic != MKTAG('S', 'M', 'K', '4'))
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| 109 | return -1;
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| 110 | smk->width = get_le32(pb);
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| 111 | smk->height = get_le32(pb);
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| 112 | smk->frames = get_le32(pb);
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| 113 | smk->pts_inc = (int32_t)get_le32(pb);
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| 114 | smk->flags = get_le32(pb);
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| 115 | for(i = 0; i < 7; i++)
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| 116 | smk->audio[i] = get_le32(pb);
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| 117 | smk->treesize = get_le32(pb);
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| 118 |
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| 119 | if(smk->treesize >= UINT_MAX/4){ // smk->treesize + 16 must not overflow (this check is probably redundant)
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| 120 | av_log(s, AV_LOG_ERROR, "treesize too large\n");
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| 121 | return -1;
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| 122 | }
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| 123 |
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| 124 | //FIXME remove extradata "rebuilding"
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| 125 | smk->mmap_size = get_le32(pb);
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| 126 | smk->mclr_size = get_le32(pb);
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| 127 | smk->full_size = get_le32(pb);
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| 128 | smk->type_size = get_le32(pb);
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| 129 | for(i = 0; i < 7; i++)
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| 130 | smk->rates[i] = get_le32(pb);
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| 131 | smk->pad = get_le32(pb);
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| 132 | /* setup data */
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| 133 | if(smk->frames > 0xFFFFFF) {
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| 134 | av_log(s, AV_LOG_ERROR, "Too many frames: %i\n", smk->frames);
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| 135 | return -1;
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| 136 | }
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| 137 | smk->frm_size = av_malloc(smk->frames * 4);
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| 138 | smk->frm_flags = av_malloc(smk->frames);
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| 139 |
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| 140 | smk->is_ver4 = (smk->magic != MKTAG('S', 'M', 'K', '2'));
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| 141 |
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| 142 | /* read frame info */
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| 143 | for(i = 0; i < smk->frames; i++) {
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| 144 | smk->frm_size[i] = get_le32(pb);
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| 145 | }
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| 146 | for(i = 0; i < smk->frames; i++) {
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| 147 | smk->frm_flags[i] = get_byte(pb);
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| 148 | }
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| 149 |
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| 150 | /* init video codec */
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| 151 | st = av_new_stream(s, 0);
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| 152 | if (!st)
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| 153 | return -1;
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| 154 | smk->videoindex = st->index;
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| 155 | st->codec->width = smk->width;
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| 156 | st->codec->height = smk->height;
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| 157 | st->codec->pix_fmt = PIX_FMT_PAL8;
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| 158 | st->codec->codec_type = CODEC_TYPE_VIDEO;
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| 159 | st->codec->codec_id = CODEC_ID_SMACKVIDEO;
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| 160 | st->codec->codec_tag = smk->magic;
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| 161 | /* Smacker uses 100000 as internal timebase */
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| 162 | if(smk->pts_inc < 0)
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| 163 | smk->pts_inc = -smk->pts_inc;
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| 164 | else
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| 165 | smk->pts_inc *= 100;
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| 166 | tbase = 100000;
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| 167 | av_reduce(&tbase, &smk->pts_inc, tbase, smk->pts_inc, (1UL<<31)-1);
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| 168 | av_set_pts_info(st, 33, smk->pts_inc, tbase);
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| 169 | /* handle possible audio streams */
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| 170 | for(i = 0; i < 7; i++) {
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| 171 | smk->indexes[i] = -1;
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| 172 | if((smk->rates[i] & 0xFFFFFF) && !(smk->rates[i] & SMK_AUD_BINKAUD)){
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| 173 | ast[i] = av_new_stream(s, 0);
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| 174 | smk->indexes[i] = ast[i]->index;
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| 175 | ast[i]->codec->codec_type = CODEC_TYPE_AUDIO;
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| 176 | ast[i]->codec->codec_id = (smk->rates[i] & SMK_AUD_PACKED) ? CODEC_ID_SMACKAUDIO : CODEC_ID_PCM_U8;
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| 177 | ast[i]->codec->codec_tag = MKTAG('S', 'M', 'K', 'A');
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| 178 | ast[i]->codec->channels = (smk->rates[i] & SMK_AUD_STEREO) ? 2 : 1;
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| 179 | ast[i]->codec->sample_rate = smk->rates[i] & 0xFFFFFF;
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| 180 | ast[i]->codec->bits_per_sample = (smk->rates[i] & SMK_AUD_16BITS) ? 16 : 8;
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| 181 | if(ast[i]->codec->bits_per_sample == 16 && ast[i]->codec->codec_id == CODEC_ID_PCM_U8)
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| 182 | ast[i]->codec->codec_id = CODEC_ID_PCM_S16LE;
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| 183 | av_set_pts_info(ast[i], 64, 1, ast[i]->codec->sample_rate
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| 184 | * ast[i]->codec->channels * ast[i]->codec->bits_per_sample / 8);
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| 185 | }
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| 186 | }
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| 187 |
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| 188 |
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| 189 | /* load trees to extradata, they will be unpacked by decoder */
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| 190 | st->codec->extradata = av_malloc(smk->treesize + 16);
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| 191 | st->codec->extradata_size = smk->treesize + 16;
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| 192 | if(!st->codec->extradata){
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| 193 | av_log(s, AV_LOG_ERROR, "Cannot allocate %i bytes of extradata\n", smk->treesize + 16);
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| 194 | av_free(smk->frm_size);
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| 195 | av_free(smk->frm_flags);
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| 196 | return -1;
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| 197 | }
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| 198 | ret = get_buffer(pb, st->codec->extradata + 16, st->codec->extradata_size - 16);
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| 199 | if(ret != st->codec->extradata_size - 16){
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| 200 | av_free(smk->frm_size);
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| 201 | av_free(smk->frm_flags);
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| 202 | return AVERROR_IO;
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| 203 | }
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| 204 | ((int32_t*)st->codec->extradata)[0] = le2me_32(smk->mmap_size);
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| 205 | ((int32_t*)st->codec->extradata)[1] = le2me_32(smk->mclr_size);
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| 206 | ((int32_t*)st->codec->extradata)[2] = le2me_32(smk->full_size);
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| 207 | ((int32_t*)st->codec->extradata)[3] = le2me_32(smk->type_size);
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| 208 |
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| 209 | smk->curstream = -1;
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| 210 | smk->nextpos = url_ftell(pb);
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| 211 |
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| 212 | return 0;
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| 213 | }
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| 214 |
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| 215 |
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| 216 | static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
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| 217 | {
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| 218 | SmackerContext *smk = (SmackerContext *)s->priv_data;
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| 219 | int flags;
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| 220 | int ret;
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| 221 | int i;
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| 222 | int frame_size = 0;
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| 223 | int palchange = 0;
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| 224 | int pos;
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| 225 |
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| 226 | if (url_feof(&s->pb) || smk->cur_frame >= smk->frames)
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| 227 | return -EIO;
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| 228 |
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| 229 | /* if we demuxed all streams, pass another frame */
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| 230 | if(smk->curstream < 0) {
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| 231 | url_fseek(&s->pb, smk->nextpos, 0);
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| 232 | frame_size = smk->frm_size[smk->cur_frame] & (~3);
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| 233 | flags = smk->frm_flags[smk->cur_frame];
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| 234 | /* handle palette change event */
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| 235 | pos = url_ftell(&s->pb);
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| 236 | if(flags & SMACKER_PAL){
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| 237 | int size, sz, t, off, j, pos;
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| 238 | uint8_t *pal = smk->pal;
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| 239 | uint8_t oldpal[768];
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| 240 |
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| 241 | memcpy(oldpal, pal, 768);
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| 242 | size = get_byte(&s->pb);
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| 243 | size = size * 4 - 1;
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| 244 | frame_size -= size;
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| 245 | frame_size--;
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| 246 | sz = 0;
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| 247 | pos = url_ftell(&s->pb) + size;
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| 248 | while(sz < 256){
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| 249 | t = get_byte(&s->pb);
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| 250 | if(t & 0x80){ /* skip palette entries */
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| 251 | sz += (t & 0x7F) + 1;
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| 252 | pal += ((t & 0x7F) + 1) * 3;
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| 253 | } else if(t & 0x40){ /* copy with offset */
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| 254 | off = get_byte(&s->pb) * 3;
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| 255 | j = (t & 0x3F) + 1;
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| 256 | while(j-- && sz < 256) {
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| 257 | *pal++ = oldpal[off + 0];
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| 258 | *pal++ = oldpal[off + 1];
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| 259 | *pal++ = oldpal[off + 2];
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| 260 | sz++;
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| 261 | off += 3;
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| 262 | }
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| 263 | } else { /* new entries */
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| 264 | *pal++ = smk_pal[t];
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| 265 | *pal++ = smk_pal[get_byte(&s->pb) & 0x3F];
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| 266 | *pal++ = smk_pal[get_byte(&s->pb) & 0x3F];
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| 267 | sz++;
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| 268 | }
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| 269 | }
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| 270 | url_fseek(&s->pb, pos, 0);
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| 271 | palchange |= 1;
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| 272 | }
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| 273 | flags >>= 1;
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| 274 | smk->curstream = -1;
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| 275 | /* if audio chunks are present, put them to stack and retrieve later */
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| 276 | for(i = 0; i < 7; i++) {
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| 277 | if(flags & 1) {
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| 278 | int size;
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| 279 | size = get_le32(&s->pb) - 4;
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| 280 | frame_size -= size;
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| 281 | frame_size -= 4;
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| 282 | smk->curstream++;
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| 283 | smk->bufs[smk->curstream] = av_realloc(smk->bufs[smk->curstream], size);
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| 284 | smk->buf_sizes[smk->curstream] = size;
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| 285 | ret = get_buffer(&s->pb, smk->bufs[smk->curstream], size);
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| 286 | if(ret != size)
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| 287 | return AVERROR_IO;
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| 288 | smk->stream_id[smk->curstream] = smk->indexes[i];
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| 289 | }
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| 290 | flags >>= 1;
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| 291 | }
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| 292 | if (av_new_packet(pkt, frame_size + 768))
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| 293 | return AVERROR_NOMEM;
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| 294 | if(smk->frm_size[smk->cur_frame] & 1)
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| 295 | palchange |= 2;
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| 296 | pkt->data[0] = palchange;
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| 297 | memcpy(pkt->data + 1, smk->pal, 768);
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| 298 | ret = get_buffer(&s->pb, pkt->data + 769, frame_size);
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| 299 | if(ret != frame_size)
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| 300 | return AVERROR_IO;
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| 301 | pkt->stream_index = smk->videoindex;
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| 302 | pkt->size = ret + 769;
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| 303 | smk->cur_frame++;
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| 304 | smk->nextpos = url_ftell(&s->pb);
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| 305 | } else {
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| 306 | if (av_new_packet(pkt, smk->buf_sizes[smk->curstream]))
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| 307 | return AVERROR_NOMEM;
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| 308 | memcpy(pkt->data, smk->bufs[smk->curstream], smk->buf_sizes[smk->curstream]);
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| 309 | pkt->size = smk->buf_sizes[smk->curstream];
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| 310 | pkt->stream_index = smk->stream_id[smk->curstream];
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| 311 | pkt->pts = smk->aud_pts[smk->curstream];
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| 312 | smk->aud_pts[smk->curstream] += LE_32(pkt->data);
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| 313 | smk->curstream--;
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| 314 | }
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| 315 |
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| 316 | return 0;
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| 317 | }
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| 318 |
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| 319 | static int smacker_read_close(AVFormatContext *s)
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| 320 | {
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| 321 | SmackerContext *smk = (SmackerContext *)s->priv_data;
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| 322 | int i;
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| 323 |
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| 324 | for(i = 0; i < 7; i++)
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| 325 | if(smk->bufs[i])
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| 326 | av_free(smk->bufs[i]);
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| 327 | if(smk->frm_size)
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| 328 | av_free(smk->frm_size);
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| 329 | if(smk->frm_flags)
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| 330 | av_free(smk->frm_flags);
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| 331 |
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| 332 | return 0;
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| 333 | }
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| 334 |
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| 335 | static AVInputFormat smacker_demuxer = {
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| 336 | "smk",
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| 337 | "Smacker Video",
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| 338 | sizeof(SmackerContext),
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| 339 | smacker_probe,
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| 340 | smacker_read_header,
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| 341 | smacker_read_packet,
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| 342 | smacker_read_close,
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| 343 | };
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| 344 |
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| 345 | int smacker_init(void)
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| 346 | {
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| 347 | av_register_input_format(&smacker_demuxer);
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| 348 | return 0;
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| 349 | }
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