libavformat/smacker.c

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