libavformat/smacker.c

   1 /*
   2  * Smacker demuxer
   3  * Copyright (c) 2006 Konstantin Shishkov.
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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 "avformat.h"
  28
  29 #define SMACKER_PAL 0x01
  30 #define SMACKER_FLAG_RING_FRAME 0x01
  31
  32 enum SAudFlags {
  33     SMK_AUD_PACKED  = 0x80000000,
  34     SMK_AUD_16BITS  = 0x20000000,
  35     SMK_AUD_STEREO  = 0x10000000,
  36     SMK_AUD_BINKAUD = 0x08000000,
  37     SMK_AUD_USEDCT  = 0x04000000
  38 };
  39
  40 typedef struct SmackerContext {
  41     /* Smacker file header */
  42     uint32_t magic;
  43     uint32_t width, height;
  44     uint32_t frames;
  45     int      pts_inc;
  46     uint32_t flags;
  47     uint32_t audio[7];
  48     uint32_t treesize;
  49     uint32_t mmap_size, mclr_size, full_size, type_size;
  50     uint32_t rates[7];
  51     uint32_t pad;
  52     /* frame info */
  53     uint32_t *frm_size;
  54     uint8_t  *frm_flags;
  55     /* internal variables */
  56     int cur_frame;
  57     int is_ver4;
  58     int64_t cur_pts;
  59     /* current frame for demuxing */
  60     uint8_t pal[768];
  61     int indexes[7];
  62     int videoindex;
  63     uint8_t *bufs[7];
  64     int buf_sizes[7];
  65     int stream_id[7];
  66     int curstream;
  67     offset_t nextpos;
  68     int64_t aud_pts[7];
  69 } SmackerContext;
  70
  71 typedef struct SmackerFrame {
  72     int64_t pts;
  73     int stream;
  74 } SmackerFrame;
  75
  76 /* palette used in Smacker */
  77 static const uint8_t smk_pal[64] = {
  78     0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
  79     0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
  80     0x41, 0x45, 0x49, 0x4D, 0x51, 0x55, 0x59, 0x5D,
  81     0x61, 0x65, 0x69, 0x6D, 0x71, 0x75, 0x79, 0x7D,
  82     0x82, 0x86, 0x8A, 0x8E, 0x92, 0x96, 0x9A, 0x9E,
  83     0xA2, 0xA6, 0xAA, 0xAE, 0xB2, 0xB6, 0xBA, 0xBE,
  84     0xC3, 0xC7, 0xCB, 0xCF, 0xD3, 0xD7, 0xDB, 0xDF,
  85     0xE3, 0xE7, 0xEB, 0xEF, 0xF3, 0xF7, 0xFB, 0xFF
  86 };
  87
  88
  89 static int smacker_probe(AVProbeData *p)
  90 {
  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 = 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     if(smk->flags & SMACKER_FLAG_RING_FRAME)
 116         smk->frames++;
 117     for(i = 0; i < 7; i++)
 118         smk->audio[i] = get_le32(pb);
 119     smk->treesize = get_le32(pb);
 120
 121     if(smk->treesize >= UINT_MAX/4){ // smk->treesize + 16 must not overflow (this check is probably redundant)
 122         av_log(s, AV_LOG_ERROR, "treesize too large\n");
 123         return -1;
 124     }
 125
 126 //FIXME remove extradata "rebuilding"
 127     smk->mmap_size = get_le32(pb);
 128     smk->mclr_size = get_le32(pb);
 129     smk->full_size = get_le32(pb);
 130     smk->type_size = get_le32(pb);
 131     for(i = 0; i < 7; i++)
 132         smk->rates[i] = get_le32(pb);
 133     smk->pad = get_le32(pb);
 134     /* setup data */
 135     if(smk->frames > 0xFFFFFF) {
 136         av_log(s, AV_LOG_ERROR, "Too many frames: %i\n", smk->frames);
 137         return -1;
 138     }
 139     smk->frm_size = av_malloc(smk->frames * 4);
 140     smk->frm_flags = av_malloc(smk->frames);
 141
 142     smk->is_ver4 = (smk->magic != MKTAG('S', 'M', 'K', '2'));
 143
 144     /* read frame info */
 145     for(i = 0; i < smk->frames; i++) {
 146         smk->frm_size[i] = get_le32(pb);
 147     }
 148     for(i = 0; i < smk->frames; i++) {
 149         smk->frm_flags[i] = get_byte(pb);
 150     }
 151
 152     /* init video codec */
 153     st = av_new_stream(s, 0);
 154     if (!st)
 155         return -1;
 156     smk->videoindex = st->index;
 157     st->codec->width = smk->width;
 158     st->codec->height = smk->height;
 159     st->codec->pix_fmt = PIX_FMT_PAL8;
 160     st->codec->codec_type = CODEC_TYPE_VIDEO;
 161     st->codec->codec_id = CODEC_ID_SMACKVIDEO;
 162     st->codec->codec_tag = smk->magic;
 163     /* Smacker uses 100000 as internal timebase */
 164     if(smk->pts_inc < 0)
 165         smk->pts_inc = -smk->pts_inc;
 166     else
 167         smk->pts_inc *= 100;
 168     tbase = 100000;
 169     av_reduce(&tbase, &smk->pts_inc, tbase, smk->pts_inc, (1UL<<31)-1);
 170     av_set_pts_info(st, 33, smk->pts_inc, tbase);
 171     /* handle possible audio streams */
 172     for(i = 0; i < 7; i++) {
 173         smk->indexes[i] = -1;
 174         if((smk->rates[i] & 0xFFFFFF) && !(smk->rates[i] & SMK_AUD_BINKAUD)){
 175             ast[i] = av_new_stream(s, 0);
 176             smk->indexes[i] = ast[i]->index;
 177             ast[i]->codec->codec_type = CODEC_TYPE_AUDIO;
 178             ast[i]->codec->codec_id = (smk->rates[i] & SMK_AUD_PACKED) ? CODEC_ID_SMACKAUDIO : CODEC_ID_PCM_U8;
 179             ast[i]->codec->codec_tag = MKTAG('S', 'M', 'K', 'A');
 180             ast[i]->codec->channels = (smk->rates[i] & SMK_AUD_STEREO) ? 2 : 1;
 181             ast[i]->codec->sample_rate = smk->rates[i] & 0xFFFFFF;
 182             ast[i]->codec->bits_per_sample = (smk->rates[i] & SMK_AUD_16BITS) ? 16 : 8;
 183             if(ast[i]->codec->bits_per_sample == 16 && ast[i]->codec->codec_id == CODEC_ID_PCM_U8)
 184                 ast[i]->codec->codec_id = CODEC_ID_PCM_S16LE;
 185             av_set_pts_info(ast[i], 64, 1, ast[i]->codec->sample_rate
 186                     * ast[i]->codec->channels * ast[i]->codec->bits_per_sample / 8);
 187         }
 188     }
 189
 190
 191     /* load trees to extradata, they will be unpacked by decoder */
 192     st->codec->extradata = av_malloc(smk->treesize + 16);
 193     st->codec->extradata_size = smk->treesize + 16;
 194     if(!st->codec->extradata){
 195         av_log(s, AV_LOG_ERROR, "Cannot allocate %i bytes of extradata\n", smk->treesize + 16);
 196         av_free(smk->frm_size);
 197         av_free(smk->frm_flags);
 198         return -1;
 199     }
 200     ret = get_buffer(pb, st->codec->extradata + 16, st->codec->extradata_size - 16);
 201     if(ret != st->codec->extradata_size - 16){
 202         av_free(smk->frm_size);
 203         av_free(smk->frm_flags);
 204         return AVERROR(EIO);
 205     }
 206     ((int32_t*)st->codec->extradata)[0] = le2me_32(smk->mmap_size);
 207     ((int32_t*)st->codec->extradata)[1] = le2me_32(smk->mclr_size);
 208     ((int32_t*)st->codec->extradata)[2] = le2me_32(smk->full_size);
 209     ((int32_t*)st->codec->extradata)[3] = le2me_32(smk->type_size);
 210
 211     smk->curstream = -1;
 212     smk->nextpos = url_ftell(pb);
 213
 214     return 0;
 215 }
 216
 217
 218 static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
 219 {
 220     SmackerContext *smk = s->priv_data;
 221     int flags;
 222     int ret;
 223     int i;
 224     int frame_size = 0;
 225     int palchange = 0;
 226     int pos;
 227
 228     if (url_feof(s->pb) || smk->cur_frame >= smk->frames)
 229         return AVERROR(EIO);
 230
 231     /* if we demuxed all streams, pass another frame */
 232     if(smk->curstream < 0) {
 233         url_fseek(s->pb, smk->nextpos, 0);
 234         frame_size = smk->frm_size[smk->cur_frame] & (~3);
 235         flags = smk->frm_flags[smk->cur_frame];
 236         /* handle palette change event */
 237         pos = url_ftell(s->pb);
 238         if(flags & SMACKER_PAL){
 239             int size, sz, t, off, j, pos;
 240             uint8_t *pal = smk->pal;
 241             uint8_t oldpal[768];
 242
 243             memcpy(oldpal, pal, 768);
 244             size = get_byte(s->pb);
 245             size = size * 4 - 1;
 246             frame_size -= size;
 247             frame_size--;
 248             sz = 0;
 249             pos = url_ftell(s->pb) + size;
 250             while(sz < 256){
 251                 t = get_byte(s->pb);
 252                 if(t & 0x80){ /* skip palette entries */
 253                     sz += (t & 0x7F) + 1;
 254                     pal += ((t & 0x7F) + 1) * 3;
 255                 } else if(t & 0x40){ /* copy with offset */
 256                     off = get_byte(s->pb) * 3;
 257                     j = (t & 0x3F) + 1;
 258                     while(j-- && sz < 256) {
 259                         *pal++ = oldpal[off + 0];
 260                         *pal++ = oldpal[off + 1];
 261                         *pal++ = oldpal[off + 2];
 262                         sz++;
 263                         off += 3;
 264                     }
 265                 } else { /* new entries */
 266                     *pal++ = smk_pal[t];
 267                     *pal++ = smk_pal[get_byte(s->pb) & 0x3F];
 268                     *pal++ = smk_pal[get_byte(s->pb) & 0x3F];
 269                     sz++;
 270                 }
 271             }
 272             url_fseek(s->pb, pos, 0);
 273             palchange |= 1;
 274         }
 275         flags >>= 1;
 276         smk->curstream = -1;
 277         /* if audio chunks are present, put them to stack and retrieve later */
 278         for(i = 0; i < 7; i++) {
 279             if(flags & 1) {
 280                 int size;
 281                 size = get_le32(s->pb) - 4;
 282                 frame_size -= size;
 283                 frame_size -= 4;
 284                 smk->curstream++;
 285                 smk->bufs[smk->curstream] = av_realloc(smk->bufs[smk->curstream], size);
 286                 smk->buf_sizes[smk->curstream] = size;
 287                 ret = get_buffer(s->pb, smk->bufs[smk->curstream], size);
 288                 if(ret != size)
 289                     return AVERROR(EIO);
 290                 smk->stream_id[smk->curstream] = smk->indexes[i];
 291             }
 292             flags >>= 1;
 293         }
 294         if (av_new_packet(pkt, frame_size + 768))
 295             return AVERROR(ENOMEM);
 296         if(smk->frm_size[smk->cur_frame] & 1)
 297             palchange |= 2;
 298         pkt->data[0] = palchange;
 299         memcpy(pkt->data + 1, smk->pal, 768);
 300         ret = get_buffer(s->pb, pkt->data + 769, frame_size);
 301         if(ret != frame_size)
 302             return AVERROR(EIO);
 303         pkt->stream_index = smk->videoindex;
 304         pkt->size = ret + 769;
 305         smk->cur_frame++;
 306         smk->nextpos = url_ftell(s->pb);
 307     } else {
 308         if (av_new_packet(pkt, smk->buf_sizes[smk->curstream]))
 309             return AVERROR(ENOMEM);
 310         memcpy(pkt->data, smk->bufs[smk->curstream], smk->buf_sizes[smk->curstream]);
 311         pkt->size = smk->buf_sizes[smk->curstream];
 312         pkt->stream_index = smk->stream_id[smk->curstream];
 313         pkt->pts = smk->aud_pts[smk->curstream];
 314         smk->aud_pts[smk->curstream] += AV_RL32(pkt->data);
 315         smk->curstream--;
 316     }
 317
 318     return 0;
 319 }
 320
 321 static int smacker_read_close(AVFormatContext *s)
 322 {
 323     SmackerContext *smk = s->priv_data;
 324     int i;
 325
 326     for(i = 0; i < 7; i++)
 327         if(smk->bufs[i])
 328             av_free(smk->bufs[i]);
 329     if(smk->frm_size)
 330         av_free(smk->frm_size);
 331     if(smk->frm_flags)
 332         av_free(smk->frm_flags);
 333
 334     return 0;
 335 }
 336
 337 AVInputFormat smacker_demuxer = {
 338     "smk",
 339     NULL_IF_CONFIG_SMALL("Smacker video"),
 340     sizeof(SmackerContext),
 341     smacker_probe,
 342     smacker_read_header,
 343     smacker_read_packet,
 344     smacker_read_close,
 345 };