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 "libavutil/intreadwrite.h"
  28 #include "avformat.h"
  29
  30 #define SMACKER_PAL 0x01
  31 #define SMACKER_FLAG_RING_FRAME 0x01
  32
  33 enum SAudFlags {
  34     SMK_AUD_PACKED  = 0x80000000,
  35     SMK_AUD_16BITS  = 0x20000000,
  36     SMK_AUD_STEREO  = 0x10000000,
  37     SMK_AUD_BINKAUD = 0x08000000,
  38     SMK_AUD_USEDCT  = 0x04000000
  39 };
  40
  41 typedef struct SmackerContext {
  42     /* Smacker file header */
  43     uint32_t magic;
  44     uint32_t width, height;
  45     uint32_t frames;
  46     int      pts_inc;
  47     uint32_t flags;
  48     uint32_t audio[7];
  49     uint32_t treesize;
  50     uint32_t mmap_size, mclr_size, full_size, type_size;
  51     uint32_t rates[7];
  52     uint32_t pad;
  53     /* frame info */
  54     uint32_t *frm_size;
  55     uint8_t  *frm_flags;
  56     /* internal variables */
  57     int cur_frame;
  58     int is_ver4;
  59     int64_t cur_pts;
  60     /* current frame for demuxing */
  61     uint8_t pal[768];
  62     int indexes[7];
  63     int videoindex;
  64     uint8_t *bufs[7];
  65     int buf_sizes[7];
  66     int stream_id[7];
  67     int curstream;
  68     int64_t nextpos;
  69     int64_t aud_pts[7];
  70 } SmackerContext;
  71
  72 typedef struct SmackerFrame {
  73     int64_t pts;
  74     int stream;
  75 } SmackerFrame;
  76
  77 /* palette used in Smacker */
  78 static const uint8_t smk_pal[64] = {
  79     0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
  80     0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
  81     0x41, 0x45, 0x49, 0x4D, 0x51, 0x55, 0x59, 0x5D,
  82     0x61, 0x65, 0x69, 0x6D, 0x71, 0x75, 0x79, 0x7D,
  83     0x82, 0x86, 0x8A, 0x8E, 0x92, 0x96, 0x9A, 0x9E,
  84     0xA2, 0xA6, 0xAA, 0xAE, 0xB2, 0xB6, 0xBA, 0xBE,
  85     0xC3, 0xC7, 0xCB, 0xCF, 0xD3, 0xD7, 0xDB, 0xDF,
  86     0xE3, 0xE7, 0xEB, 0xEF, 0xF3, 0xF7, 0xFB, 0xFF
  87 };
  88
  89
  90 static int smacker_probe(AVProbeData *p)
  91 {
  92     if(p->buf[0] == 'S' && p->buf[1] == 'M' && p->buf[2] == 'K'
  93         && (p->buf[3] == '2' || p->buf[3] == '4'))
  94         return AVPROBE_SCORE_MAX;
  95     else
  96         return 0;
  97 }
  98
  99 static int smacker_read_header(AVFormatContext *s, AVFormatParameters *ap)
 100 {
 101     ByteIOContext *pb = s->pb;
 102     SmackerContext *smk = s->priv_data;
 103     AVStream *st, *ast[7];
 104     int i, ret;
 105     int tbase;
 106
 107     /* read and check header */
 108     smk->magic = get_le32(pb);
 109     if (smk->magic != MKTAG('S', 'M', 'K', '2') && smk->magic != MKTAG('S', 'M', 'K', '4'))
 110         return -1;
 111     smk->width = get_le32(pb);
 112     smk->height = get_le32(pb);
 113     smk->frames = get_le32(pb);
 114     smk->pts_inc = (int32_t)get_le32(pb);
 115     smk->flags = get_le32(pb);
 116     if(smk->flags & SMACKER_FLAG_RING_FRAME)
 117         smk->frames++;
 118     for(i = 0; i < 7; i++)
 119         smk->audio[i] = get_le32(pb);
 120     smk->treesize = get_le32(pb);
 121
 122     if(smk->treesize >= UINT_MAX/4){ // smk->treesize + 16 must not overflow (this check is probably redundant)
 123         av_log(s, AV_LOG_ERROR, "treesize too large\n");
 124         return -1;
 125     }
 126
 127 //FIXME remove extradata "rebuilding"
 128     smk->mmap_size = get_le32(pb);
 129     smk->mclr_size = get_le32(pb);
 130     smk->full_size = get_le32(pb);
 131     smk->type_size = get_le32(pb);
 132     for(i = 0; i < 7; i++)
 133         smk->rates[i] = get_le32(pb);
 134     smk->pad = get_le32(pb);
 135     /* setup data */
 136     if(smk->frames > 0xFFFFFF) {
 137         av_log(s, AV_LOG_ERROR, "Too many frames: %i\n", smk->frames);
 138         return -1;
 139     }
 140     smk->frm_size = av_malloc(smk->frames * 4);
 141     smk->frm_flags = av_malloc(smk->frames);
 142
 143     smk->is_ver4 = (smk->magic != MKTAG('S', 'M', 'K', '2'));
 144
 145     /* read frame info */
 146     for(i = 0; i < smk->frames; i++) {
 147         smk->frm_size[i] = get_le32(pb);
 148     }
 149     for(i = 0; i < smk->frames; i++) {
 150         smk->frm_flags[i] = get_byte(pb);
 151     }
 152
 153     /* init video codec */
 154     st = av_new_stream(s, 0);
 155     if (!st)
 156         return -1;
 157     smk->videoindex = st->index;
 158     st->codec->width = smk->width;
 159     st->codec->height = smk->height;
 160     st->codec->pix_fmt = PIX_FMT_PAL8;
 161     st->codec->codec_type = CODEC_TYPE_VIDEO;
 162     st->codec->codec_id = CODEC_ID_SMACKVIDEO;
 163     st->codec->codec_tag = smk->magic;
 164     /* Smacker uses 100000 as internal timebase */
 165     if(smk->pts_inc < 0)
 166         smk->pts_inc = -smk->pts_inc;
 167     else
 168         smk->pts_inc *= 100;
 169     tbase = 100000;
 170     av_reduce(&tbase, &smk->pts_inc, tbase, smk->pts_inc, (1UL<<31)-1);
 171     av_set_pts_info(st, 33, smk->pts_inc, tbase);
 172     /* handle possible audio streams */
 173     for(i = 0; i < 7; i++) {
 174         smk->indexes[i] = -1;
 175         if((smk->rates[i] & 0xFFFFFF) && !(smk->rates[i] & SMK_AUD_BINKAUD)){
 176             ast[i] = av_new_stream(s, 0);
 177             smk->indexes[i] = ast[i]->index;
 178             ast[i]->codec->codec_type = CODEC_TYPE_AUDIO;
 179             ast[i]->codec->codec_id = (smk->rates[i] & SMK_AUD_PACKED) ? CODEC_ID_SMACKAUDIO : CODEC_ID_PCM_U8;
 180             ast[i]->codec->codec_tag = MKTAG('S', 'M', 'K', 'A');
 181             ast[i]->codec->channels = (smk->rates[i] & SMK_AUD_STEREO) ? 2 : 1;
 182             ast[i]->codec->sample_rate = smk->rates[i] & 0xFFFFFF;
 183             ast[i]->codec->bits_per_coded_sample = (smk->rates[i] & SMK_AUD_16BITS) ? 16 : 8;
 184             if(ast[i]->codec->bits_per_coded_sample == 16 && ast[i]->codec->codec_id == CODEC_ID_PCM_U8)
 185                 ast[i]->codec->codec_id = CODEC_ID_PCM_S16LE;
 186             ast[i]->codec->sample_fmt = ast[i]->codec->bits_per_coded_sample == 8 ? SAMPLE_FMT_U8 : SAMPLE_FMT_S16;
 187             av_set_pts_info(ast[i], 64, 1, ast[i]->codec->sample_rate
 188                     * ast[i]->codec->channels * ast[i]->codec->bits_per_coded_sample / 8);
 189         }
 190     }
 191
 192
 193     /* load trees to extradata, they will be unpacked by decoder */
 194     st->codec->extradata = av_malloc(smk->treesize + 16);
 195     st->codec->extradata_size = smk->treesize + 16;
 196     if(!st->codec->extradata){
 197         av_log(s, AV_LOG_ERROR, "Cannot allocate %i bytes of extradata\n", smk->treesize + 16);
 198         av_free(smk->frm_size);
 199         av_free(smk->frm_flags);
 200         return -1;
 201     }
 202     ret = get_buffer(pb, st->codec->extradata + 16, st->codec->extradata_size - 16);
 203     if(ret != st->codec->extradata_size - 16){
 204         av_free(smk->frm_size);
 205         av_free(smk->frm_flags);
 206         return AVERROR(EIO);
 207     }
 208     ((int32_t*)st->codec->extradata)[0] = le2me_32(smk->mmap_size);
 209     ((int32_t*)st->codec->extradata)[1] = le2me_32(smk->mclr_size);
 210     ((int32_t*)st->codec->extradata)[2] = le2me_32(smk->full_size);
 211     ((int32_t*)st->codec->extradata)[3] = le2me_32(smk->type_size);
 212
 213     smk->curstream = -1;
 214     smk->nextpos = url_ftell(pb);
 215
 216     return 0;
 217 }
 218
 219
 220 static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
 221 {
 222     SmackerContext *smk = s->priv_data;
 223     int flags;
 224     int ret;
 225     int i;
 226     int frame_size = 0;
 227     int palchange = 0;
 228     int pos;
 229
 230     if (url_feof(s->pb) || smk->cur_frame >= smk->frames)
 231         return AVERROR(EIO);
 232
 233     /* if we demuxed all streams, pass another frame */
 234     if(smk->curstream < 0) {
 235         url_fseek(s->pb, smk->nextpos, 0);
 236         frame_size = smk->frm_size[smk->cur_frame] & (~3);
 237         flags = smk->frm_flags[smk->cur_frame];
 238         /* handle palette change event */
 239         pos = url_ftell(s->pb);
 240         if(flags & SMACKER_PAL){
 241             int size, sz, t, off, j, pos;
 242             uint8_t *pal = smk->pal;
 243             uint8_t oldpal[768];
 244
 245             memcpy(oldpal, pal, 768);
 246             size = get_byte(s->pb);
 247             size = size * 4 - 1;
 248             frame_size -= size;
 249             frame_size--;
 250             sz = 0;
 251             pos = url_ftell(s->pb) + size;
 252             while(sz < 256){
 253                 t = get_byte(s->pb);
 254                 if(t & 0x80){ /* skip palette entries */
 255                     sz += (t & 0x7F) + 1;
 256                     pal += ((t & 0x7F) + 1) * 3;
 257                 } else if(t & 0x40){ /* copy with offset */
 258                     off = get_byte(s->pb) * 3;
 259                     j = (t & 0x3F) + 1;
 260                     while(j-- && sz < 256) {
 261                         *pal++ = oldpal[off + 0];
 262                         *pal++ = oldpal[off + 1];
 263                         *pal++ = oldpal[off + 2];
 264                         sz++;
 265                         off += 3;
 266                     }
 267                 } else { /* new entries */
 268                     *pal++ = smk_pal[t];
 269                     *pal++ = smk_pal[get_byte(s->pb) & 0x3F];
 270                     *pal++ = smk_pal[get_byte(s->pb) & 0x3F];
 271                     sz++;
 272                 }
 273             }
 274             url_fseek(s->pb, pos, 0);
 275             palchange |= 1;
 276         }
 277         flags >>= 1;
 278         smk->curstream = -1;
 279         /* if audio chunks are present, put them to stack and retrieve later */
 280         for(i = 0; i < 7; i++) {
 281             if(flags & 1) {
 282                 int size;
 283                 size = get_le32(s->pb) - 4;
 284                 frame_size -= size;
 285                 frame_size -= 4;
 286                 smk->curstream++;
 287                 smk->bufs[smk->curstream] = av_realloc(smk->bufs[smk->curstream], size);
 288                 smk->buf_sizes[smk->curstream] = size;
 289                 ret = get_buffer(s->pb, smk->bufs[smk->curstream], size);
 290                 if(ret != size)
 291                     return AVERROR(EIO);
 292                 smk->stream_id[smk->curstream] = smk->indexes[i];
 293             }
 294             flags >>= 1;
 295         }
 296         if (av_new_packet(pkt, frame_size + 768))
 297             return AVERROR(ENOMEM);
 298         if(smk->frm_size[smk->cur_frame] & 1)
 299             palchange |= 2;
 300         pkt->data[0] = palchange;
 301         memcpy(pkt->data + 1, smk->pal, 768);
 302         ret = get_buffer(s->pb, pkt->data + 769, frame_size);
 303         if(ret != frame_size)
 304             return AVERROR(EIO);
 305         pkt->stream_index = smk->videoindex;
 306         pkt->size = ret + 769;
 307         smk->cur_frame++;
 308         smk->nextpos = url_ftell(s->pb);
 309     } else {
 310         if (av_new_packet(pkt, smk->buf_sizes[smk->curstream]))
 311             return AVERROR(ENOMEM);
 312         memcpy(pkt->data, smk->bufs[smk->curstream], smk->buf_sizes[smk->curstream]);
 313         pkt->size = smk->buf_sizes[smk->curstream];
 314         pkt->stream_index = smk->stream_id[smk->curstream];
 315         pkt->pts = smk->aud_pts[smk->curstream];
 316         smk->aud_pts[smk->curstream] += AV_RL32(pkt->data);
 317         smk->curstream--;
 318     }
 319
 320     return 0;
 321 }
 322
 323 static int smacker_read_close(AVFormatContext *s)
 324 {
 325     SmackerContext *smk = s->priv_data;
 326     int i;
 327
 328     for(i = 0; i < 7; i++)
 329         if(smk->bufs[i])
 330             av_free(smk->bufs[i]);
 331     if(smk->frm_size)
 332         av_free(smk->frm_size);
 333     if(smk->frm_flags)
 334         av_free(smk->frm_flags);
 335
 336     return 0;
 337 }
 338
 339 AVInputFormat smacker_demuxer = {
 340     "smk",
 341     NULL_IF_CONFIG_SMALL("Smacker video"),
 342     sizeof(SmackerContext),
 343     smacker_probe,
 344     smacker_read_header,
 345     smacker_read_packet,
 346     smacker_read_close,
 347 };