libavformat/smacker.c

   1 /*
   2  * Smacker demuxer
   3  * Copyright (c) 2006 Konstantin Shishkov
   4  *
   5  * This file is part of Libav.
   6  *
   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.
  11  *
  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.
  16  *
  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
  20  */
  21
  22 /*
  23  * Based on http://wiki.multimedia.cx/index.php?title=Smacker
  24  */
  25
  26 #include "libavutil/bswap.h"
  27 #include "libavutil/channel_layout.h"
  28 #include "libavutil/intreadwrite.h"
  29 #include "avformat.h"
  30 #include "internal.h"
  31
  32 #define SMACKER_PAL 0x01
  33 #define SMACKER_FLAG_RING_FRAME 0x01
  34
  35 enum SAudFlags {
  36     SMK_AUD_PACKED  = 0x80,
  37     SMK_AUD_16BITS  = 0x20,
  38     SMK_AUD_STEREO  = 0x10,
  39     SMK_AUD_BINKAUD = 0x08,
  40     SMK_AUD_USEDCT  = 0x04
  41 };
  42
  43 typedef struct SmackerContext {
  44     /* Smacker file header */
  45     uint32_t magic;
  46     uint32_t width, height;
  47     uint32_t frames;
  48     int      pts_inc;
  49     uint32_t flags;
  50     uint32_t audio[7];
  51     uint32_t treesize;
  52     uint32_t mmap_size, mclr_size, full_size, type_size;
  53     uint8_t  aflags[7];
  54     uint32_t rates[7];
  55     uint32_t pad;
  56     /* frame info */
  57     uint32_t *frm_size;
  58     uint8_t  *frm_flags;
  59     /* internal variables */
  60     int cur_frame;
  61     int is_ver4;
  62     int64_t cur_pts;
  63     /* current frame for demuxing */
  64     uint8_t pal[768];
  65     int indexes[7];
  66     int videoindex;
  67     uint8_t *bufs[7];
  68     int buf_sizes[7];
  69     int stream_id[7];
  70     int curstream;
  71     int64_t nextpos;
  72     int64_t aud_pts[7];
  73 } SmackerContext;
  74
  75 typedef struct SmackerFrame {
  76     int64_t pts;
  77     int stream;
  78 } SmackerFrame;
  79
  80 /* palette used in Smacker */
  81 static const uint8_t smk_pal[64] = {
  82     0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
  83     0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
  84     0x41, 0x45, 0x49, 0x4D, 0x51, 0x55, 0x59, 0x5D,
  85     0x61, 0x65, 0x69, 0x6D, 0x71, 0x75, 0x79, 0x7D,
  86     0x82, 0x86, 0x8A, 0x8E, 0x92, 0x96, 0x9A, 0x9E,
  87     0xA2, 0xA6, 0xAA, 0xAE, 0xB2, 0xB6, 0xBA, 0xBE,
  88     0xC3, 0xC7, 0xCB, 0xCF, 0xD3, 0xD7, 0xDB, 0xDF,
  89     0xE3, 0xE7, 0xEB, 0xEF, 0xF3, 0xF7, 0xFB, 0xFF
  90 };
  91
  92
  93 static int smacker_probe(AVProbeData *p)
  94 {
  95     if(p->buf[0] == 'S' && p->buf[1] == 'M' && p->buf[2] == 'K'
  96         && (p->buf[3] == '2' || p->buf[3] == '4'))
  97         return AVPROBE_SCORE_MAX;
  98     else
  99         return 0;
 100 }
 101
 102 static int smacker_read_header(AVFormatContext *s)
 103 {
 104     AVIOContext *pb = s->pb;
 105     SmackerContext *smk = s->priv_data;
 106     AVStream *st, *ast[7];
 107     int i, ret;
 108     int tbase;
 109
 110     /* read and check header */
 111     smk->magic = avio_rl32(pb);
 112     if (smk->magic != MKTAG('S', 'M', 'K', '2') && smk->magic != MKTAG('S', 'M', 'K', '4'))
 113         return -1;
 114     smk->width = avio_rl32(pb);
 115     smk->height = avio_rl32(pb);
 116     smk->frames = avio_rl32(pb);
 117     smk->pts_inc = (int32_t)avio_rl32(pb);
 118     smk->flags = avio_rl32(pb);
 119     if(smk->flags & SMACKER_FLAG_RING_FRAME)
 120         smk->frames++;
 121     for(i = 0; i < 7; i++)
 122         smk->audio[i] = avio_rl32(pb);
 123     smk->treesize = avio_rl32(pb);
 124
 125     if(smk->treesize >= UINT_MAX/4){ // smk->treesize + 16 must not overflow (this check is probably redundant)
 126         av_log(s, AV_LOG_ERROR, "treesize too large\n");
 127         return -1;
 128     }
 129
 130 //FIXME remove extradata "rebuilding"
 131     smk->mmap_size = avio_rl32(pb);
 132     smk->mclr_size = avio_rl32(pb);
 133     smk->full_size = avio_rl32(pb);
 134     smk->type_size = avio_rl32(pb);
 135     for(i = 0; i < 7; i++) {
 136         smk->rates[i]  = avio_rl24(pb);
 137         smk->aflags[i] = avio_r8(pb);
 138     }
 139     smk->pad = avio_rl32(pb);
 140     /* setup data */
 141     if(smk->frames > 0xFFFFFF) {
 142         av_log(s, AV_LOG_ERROR, "Too many frames: %i\n", smk->frames);
 143         return -1;
 144     }
 145     smk->frm_size = av_malloc(smk->frames * 4);
 146     smk->frm_flags = av_malloc(smk->frames);
 147
 148     smk->is_ver4 = (smk->magic != MKTAG('S', 'M', 'K', '2'));
 149
 150     /* read frame info */
 151     for(i = 0; i < smk->frames; i++) {
 152         smk->frm_size[i] = avio_rl32(pb);
 153     }
 154     for(i = 0; i < smk->frames; i++) {
 155         smk->frm_flags[i] = avio_r8(pb);
 156     }
 157
 158     /* init video codec */
 159     st = avformat_new_stream(s, NULL);
 160     if (!st)
 161         return -1;
 162     smk->videoindex = st->index;
 163     st->codec->width = smk->width;
 164     st->codec->height = smk->height;
 165     st->codec->pix_fmt = AV_PIX_FMT_PAL8;
 166     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
 167     st->codec->codec_id = AV_CODEC_ID_SMACKVIDEO;
 168     st->codec->codec_tag = smk->magic;
 169     /* Smacker uses 100000 as internal timebase */
 170     if(smk->pts_inc < 0)
 171         smk->pts_inc = -smk->pts_inc;
 172     else
 173         smk->pts_inc *= 100;
 174     tbase = 100000;
 175     av_reduce(&tbase, &smk->pts_inc, tbase, smk->pts_inc, (1UL<<31)-1);
 176     avpriv_set_pts_info(st, 33, smk->pts_inc, tbase);
 177     st->duration = smk->frames;
 178     /* handle possible audio streams */
 179     for(i = 0; i < 7; i++) {
 180         smk->indexes[i] = -1;
 181         if (smk->rates[i]) {
 182             ast[i] = avformat_new_stream(s, NULL);
 183             smk->indexes[i] = ast[i]->index;
 184             ast[i]->codec->codec_type = AVMEDIA_TYPE_AUDIO;
 185             if (smk->aflags[i] & SMK_AUD_BINKAUD) {
 186                 ast[i]->codec->codec_id = AV_CODEC_ID_BINKAUDIO_RDFT;
 187             } else if (smk->aflags[i] & SMK_AUD_USEDCT) {
 188                 ast[i]->codec->codec_id = AV_CODEC_ID_BINKAUDIO_DCT;
 189             } else if (smk->aflags[i] & SMK_AUD_PACKED){
 190                 ast[i]->codec->codec_id = AV_CODEC_ID_SMACKAUDIO;
 191                 ast[i]->codec->codec_tag = MKTAG('S', 'M', 'K', 'A');
 192             } else {
 193                 ast[i]->codec->codec_id = AV_CODEC_ID_PCM_U8;
 194             }
 195             if (smk->aflags[i] & SMK_AUD_STEREO) {
 196                 ast[i]->codec->channels       = 2;
 197                 ast[i]->codec->channel_layout = AV_CH_LAYOUT_STEREO;
 198             } else {
 199                 ast[i]->codec->channels       = 1;
 200                 ast[i]->codec->channel_layout = AV_CH_LAYOUT_MONO;
 201             }
 202             ast[i]->codec->sample_rate = smk->rates[i];
 203             ast[i]->codec->bits_per_coded_sample = (smk->aflags[i] & SMK_AUD_16BITS) ? 16 : 8;
 204             if(ast[i]->codec->bits_per_coded_sample == 16 && ast[i]->codec->codec_id == AV_CODEC_ID_PCM_U8)
 205                 ast[i]->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
 206             avpriv_set_pts_info(ast[i], 64, 1, ast[i]->codec->sample_rate
 207                     * ast[i]->codec->channels * ast[i]->codec->bits_per_coded_sample / 8);
 208         }
 209     }
 210
 211
 212     /* load trees to extradata, they will be unpacked by decoder */
 213     st->codec->extradata = av_malloc(smk->treesize + 16);
 214     st->codec->extradata_size = smk->treesize + 16;
 215     if(!st->codec->extradata){
 216         av_log(s, AV_LOG_ERROR, "Cannot allocate %i bytes of extradata\n", smk->treesize + 16);
 217         av_free(smk->frm_size);
 218         av_free(smk->frm_flags);
 219         return -1;
 220     }
 221     ret = avio_read(pb, st->codec->extradata + 16, st->codec->extradata_size - 16);
 222     if(ret != st->codec->extradata_size - 16){
 223         av_free(smk->frm_size);
 224         av_free(smk->frm_flags);
 225         return AVERROR(EIO);
 226     }
 227     ((int32_t*)st->codec->extradata)[0] = av_le2ne32(smk->mmap_size);
 228     ((int32_t*)st->codec->extradata)[1] = av_le2ne32(smk->mclr_size);
 229     ((int32_t*)st->codec->extradata)[2] = av_le2ne32(smk->full_size);
 230     ((int32_t*)st->codec->extradata)[3] = av_le2ne32(smk->type_size);
 231
 232     smk->curstream = -1;
 233     smk->nextpos = avio_tell(pb);
 234
 235     return 0;
 236 }
 237
 238
 239 static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
 240 {
 241     SmackerContext *smk = s->priv_data;
 242     int flags;
 243     int ret;
 244     int i;
 245     int frame_size = 0;
 246     int palchange = 0;
 247
 248     if (s->pb->eof_reached || smk->cur_frame >= smk->frames)
 249         return AVERROR_EOF;
 250
 251     /* if we demuxed all streams, pass another frame */
 252     if(smk->curstream < 0) {
 253         avio_seek(s->pb, smk->nextpos, 0);
 254         frame_size = smk->frm_size[smk->cur_frame] & (~3);
 255         flags = smk->frm_flags[smk->cur_frame];
 256         /* handle palette change event */
 257         if(flags & SMACKER_PAL){
 258             int size, sz, t, off, j, pos;
 259             uint8_t *pal = smk->pal;
 260             uint8_t oldpal[768];
 261
 262             memcpy(oldpal, pal, 768);
 263             size = avio_r8(s->pb);
 264             size = size * 4 - 1;
 265             frame_size -= size;
 266             frame_size--;
 267             sz = 0;
 268             pos = avio_tell(s->pb) + size;
 269             while(sz < 256){
 270                 t = avio_r8(s->pb);
 271                 if(t & 0x80){ /* skip palette entries */
 272                     sz += (t & 0x7F) + 1;
 273                     pal += ((t & 0x7F) + 1) * 3;
 274                 } else if(t & 0x40){ /* copy with offset */
 275                     off = avio_r8(s->pb);
 276                     j = (t & 0x3F) + 1;
 277                     if (off + j > 0xff) {
 278                         av_log(s, AV_LOG_ERROR,
 279                                "Invalid palette update, offset=%d length=%d extends beyond palette size\n",
 280                                off, j);
 281                         return AVERROR_INVALIDDATA;
 282                     }
 283                     off *= 3;
 284                     while(j-- && sz < 256) {
 285                         *pal++ = oldpal[off + 0];
 286                         *pal++ = oldpal[off + 1];
 287                         *pal++ = oldpal[off + 2];
 288                         sz++;
 289                         off += 3;
 290                     }
 291                 } else { /* new entries */
 292                     *pal++ = smk_pal[t];
 293                     *pal++ = smk_pal[avio_r8(s->pb) & 0x3F];
 294                     *pal++ = smk_pal[avio_r8(s->pb) & 0x3F];
 295                     sz++;
 296                 }
 297             }
 298             avio_seek(s->pb, pos, 0);
 299             palchange |= 1;
 300         }
 301         flags >>= 1;
 302         smk->curstream = -1;
 303         /* if audio chunks are present, put them to stack and retrieve later */
 304         for(i = 0; i < 7; i++) {
 305             if(flags & 1) {
 306                 int size;
 307                 uint8_t *tmpbuf;
 308
 309                 size = avio_rl32(s->pb) - 4;
 310                 frame_size -= size;
 311                 frame_size -= 4;
 312                 smk->curstream++;
 313                 tmpbuf = av_realloc(smk->bufs[smk->curstream], size);
 314                 if (!tmpbuf)
 315                     return AVERROR(ENOMEM);
 316                 smk->bufs[smk->curstream] = tmpbuf;
 317                 smk->buf_sizes[smk->curstream] = size;
 318                 ret = avio_read(s->pb, smk->bufs[smk->curstream], size);
 319                 if(ret != size)
 320                     return AVERROR(EIO);
 321                 smk->stream_id[smk->curstream] = smk->indexes[i];
 322             }
 323             flags >>= 1;
 324         }
 325         if (frame_size < 0)
 326             return AVERROR_INVALIDDATA;
 327         if (av_new_packet(pkt, frame_size + 769))
 328             return AVERROR(ENOMEM);
 329         if(smk->frm_size[smk->cur_frame] & 1)
 330             palchange |= 2;
 331         pkt->data[0] = palchange;
 332         memcpy(pkt->data + 1, smk->pal, 768);
 333         ret = avio_read(s->pb, pkt->data + 769, frame_size);
 334         if(ret != frame_size)
 335             return AVERROR(EIO);
 336         pkt->stream_index = smk->videoindex;
 337         pkt->size = ret + 769;
 338         smk->cur_frame++;
 339         smk->nextpos = avio_tell(s->pb);
 340     } else {
 341         if (av_new_packet(pkt, smk->buf_sizes[smk->curstream]))
 342             return AVERROR(ENOMEM);
 343         memcpy(pkt->data, smk->bufs[smk->curstream], smk->buf_sizes[smk->curstream]);
 344         pkt->size = smk->buf_sizes[smk->curstream];
 345         pkt->stream_index = smk->stream_id[smk->curstream];
 346         pkt->pts = smk->aud_pts[smk->curstream];
 347         smk->aud_pts[smk->curstream] += AV_RL32(pkt->data);
 348         smk->curstream--;
 349     }
 350
 351     return 0;
 352 }
 353
 354 static int smacker_read_close(AVFormatContext *s)
 355 {
 356     SmackerContext *smk = s->priv_data;
 357     int i;
 358
 359     for(i = 0; i < 7; i++)
 360         av_free(smk->bufs[i]);
 361     av_free(smk->frm_size);
 362     av_free(smk->frm_flags);
 363
 364     return 0;
 365 }
 366
 367 AVInputFormat ff_smacker_demuxer = {
 368     .name           = "smk",
 369     .long_name      = NULL_IF_CONFIG_SMALL("Smacker video"),
 370     .priv_data_size = sizeof(SmackerContext),
 371     .read_probe     = smacker_probe,
 372     .read_header    = smacker_read_header,
 373     .read_packet    = smacker_read_packet,
 374     .read_close     = smacker_read_close,
 375 };