libavformat/smush.c

   1 /*
   2  * LucasArts Smush demuxer
   3  * Copyright (c) 2006 Cyril Zorin
   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 #include "libavutil/intreadwrite.h"
  23
  24 #include "avformat.h"
  25 #include "avio.h"
  26 #include "demux.h"
  27 #include "internal.h"
  28
  29 typedef struct SMUSHContext {
  30     int version;
  31     int audio_stream_index;
  32     int video_stream_index;
  33 } SMUSHContext;
  34
  35 static int smush_read_probe(const AVProbeData *p)
  36 {
  37     if (((AV_RL32(p->buf)     == MKTAG('S', 'A', 'N', 'M') &&
  38           AV_RL32(p->buf + 8) == MKTAG('S', 'H', 'D', 'R')) ||
  39          (AV_RL32(p->buf)     == MKTAG('A', 'N', 'I', 'M') &&
  40           AV_RL32(p->buf + 8) == MKTAG('A', 'H', 'D', 'R')))) {
  41         return AVPROBE_SCORE_MAX;
  42     }
  43
  44     return 0;
  45 }
  46
  47 static int smush_read_header(AVFormatContext *ctx)
  48 {
  49     SMUSHContext *smush = ctx->priv_data;
  50     AVIOContext *pb = ctx->pb;
  51     AVStream *vst, *ast;
  52     uint32_t magic, nframes, size, subversion, i;
  53     uint32_t width = 0, height = 0, got_audio = 0, read = 0;
  54     uint32_t sample_rate, channels, palette[256], frame_rate = 15;
  55     int ret;
  56
  57     magic = avio_rb32(pb);
  58     avio_skip(pb, 4); // skip movie size
  59
  60     if (magic == MKBETAG('A', 'N', 'I', 'M')) {
  61         if (avio_rb32(pb) != MKBETAG('A', 'H', 'D', 'R'))
  62             return AVERROR_INVALIDDATA;
  63
  64         size = avio_rb32(pb);
  65         if (size < 3 * 256 + 6)
  66             return AVERROR_INVALIDDATA;
  67         size -= 3 * 256 + 6;
  68
  69         smush->version = 0;
  70         subversion     = avio_rl16(pb);
  71         nframes        = avio_rl16(pb);
  72         if (!nframes)
  73             return AVERROR_INVALIDDATA;
  74
  75         avio_skip(pb, 2); // skip pad
  76
  77         for (i = 0; i < 256; i++)
  78             palette[i] = avio_rb24(pb);
  79
  80         if (subversion > 1) {
  81             if (size < 12)
  82                 return AVERROR_INVALIDDATA;
  83             size -= 12;
  84             frame_rate = avio_rl32(pb);
  85             avio_skip(pb, 4);            // max size of FRME chunk in file
  86             sample_rate = avio_rl32(pb);
  87             if (frame_rate < 1 || frame_rate > 70)
  88                 frame_rate = 12;
  89         }
  90         avio_skip(pb, size);
  91     } else if (magic == MKBETAG('S', 'A', 'N', 'M')) {
  92         if (avio_rb32(pb) != MKBETAG('S', 'H', 'D', 'R'))
  93             return AVERROR_INVALIDDATA;
  94
  95         size = avio_rb32(pb);
  96         if (size < 14)
  97             return AVERROR_INVALIDDATA;
  98
  99         smush->version = 1;
 100         subversion = avio_rl16(pb);
 101         nframes = avio_rl32(pb);
 102         if (!nframes)
 103             return AVERROR_INVALIDDATA;
 104
 105         avio_skip(pb, 2); // skip pad
 106         width  = avio_rl16(pb);
 107         height = avio_rl16(pb);
 108         avio_skip(pb, 2); // skip pad
 109         avio_skip(pb, size - 14);
 110
 111         if (avio_rb32(pb) != MKBETAG('F', 'L', 'H', 'D'))
 112             return AVERROR_INVALIDDATA;
 113
 114         size = avio_rb32(pb);
 115         while (!got_audio && ((read + 8) < size)) {
 116             uint32_t sig, chunk_size;
 117
 118             if (avio_feof(pb))
 119                 return AVERROR_EOF;
 120
 121             sig        = avio_rb32(pb);
 122             chunk_size = avio_rb32(pb);
 123             read      += 8;
 124             switch (sig) {
 125             case MKBETAG('W', 'a', 'v', 'e'):
 126                 got_audio = 1;
 127                 sample_rate = avio_rl32(pb);
 128                 if (!sample_rate)
 129                     return AVERROR_INVALIDDATA;
 130
 131                 channels = avio_rl32(pb);
 132                 if (!channels)
 133                     return AVERROR_INVALIDDATA;
 134
 135                 avio_skip(pb, chunk_size - 8);
 136                 read += chunk_size;
 137                 break;
 138             case MKBETAG('B', 'l', '1', '6'):
 139             case MKBETAG('A', 'N', 'N', 'O'):
 140                 avio_skip(pb, chunk_size);
 141                 read += chunk_size;
 142                 break;
 143             default:
 144                 return AVERROR_INVALIDDATA;
 145             }
 146         }
 147
 148         avio_skip(pb, size - read);
 149     } else {
 150         av_log(ctx, AV_LOG_ERROR, "Wrong magic\n");
 151         return AVERROR_INVALIDDATA;
 152     }
 153
 154     vst = avformat_new_stream(ctx, 0);
 155     if (!vst)
 156         return AVERROR(ENOMEM);
 157
 158     smush->video_stream_index = vst->index;
 159
 160     avpriv_set_pts_info(vst, 64, 1, frame_rate);
 161
 162     vst->start_time        = 0;
 163     vst->duration          =
 164     vst->nb_frames         = nframes;
 165     vst->avg_frame_rate    = av_inv_q(vst->time_base);
 166     vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
 167     vst->codecpar->codec_id   = AV_CODEC_ID_SANM;
 168     vst->codecpar->codec_tag  = 0;
 169     vst->codecpar->width      = width;
 170     vst->codecpar->height     = height;
 171
 172     if (!smush->version) {
 173         if ((ret = ff_alloc_extradata(vst->codecpar, 1024 + 2)) < 0)
 174             return ret;
 175
 176         AV_WL16(vst->codecpar->extradata, subversion);
 177         for (i = 0; i < 256; i++)
 178             AV_WL32(vst->codecpar->extradata + 2 + i * 4, palette[i]);
 179     }
 180
 181     if (got_audio) {
 182         ast = avformat_new_stream(ctx, 0);
 183         if (!ast)
 184             return AVERROR(ENOMEM);
 185
 186         smush->audio_stream_index = ast->index;
 187
 188         ast->start_time         = 0;
 189         ast->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
 190         ast->codecpar->codec_id    = AV_CODEC_ID_ADPCM_VIMA;
 191         ast->codecpar->codec_tag   = 0;
 192         ast->codecpar->sample_rate = sample_rate;
 193         ast->codecpar->ch_layout.nb_channels = channels;
 194         avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
 195     }
 196
 197     return 0;
 198 }
 199
 200 static int smush_read_packet(AVFormatContext *ctx, AVPacket *pkt)
 201 {
 202     SMUSHContext *smush = ctx->priv_data;
 203     AVIOContext *pb = ctx->pb;
 204     int done = 0;
 205     int ret;
 206
 207     while (!done) {
 208         uint32_t sig, size;
 209
 210         if (avio_feof(pb))
 211             return AVERROR_EOF;
 212
 213         sig  = avio_rb32(pb);
 214         size = avio_rb32(pb);
 215
 216         switch (sig) {
 217         case MKBETAG('F', 'R', 'M', 'E'):
 218             if (smush->version)
 219                 break;
 220             if ((ret = av_get_packet(pb, pkt, size)) < 0)
 221                 return ret;
 222
 223             pkt->stream_index = smush->video_stream_index;
 224             done = 1;
 225             break;
 226         case MKBETAG('B', 'l', '1', '6'):
 227             if ((ret = av_get_packet(pb, pkt, size)) < 0)
 228                 return ret;
 229
 230             pkt->stream_index = smush->video_stream_index;
 231             pkt->duration = 1;
 232             done = 1;
 233             break;
 234         case MKBETAG('W', 'a', 'v', 'e'):
 235             if (size < 13)
 236                 return AVERROR_INVALIDDATA;
 237             if (av_get_packet(pb, pkt, size) < 13)
 238                 return AVERROR_INVALIDDATA;
 239
 240             pkt->stream_index = smush->audio_stream_index;
 241             pkt->flags       |= AV_PKT_FLAG_KEY;
 242             pkt->duration     = AV_RB32(pkt->data);
 243             if (pkt->duration == 0xFFFFFFFFu)
 244                 pkt->duration = AV_RB32(pkt->data + 8);
 245             done = 1;
 246             break;
 247         default:
 248             avio_skip(pb, size);
 249             break;
 250         }
 251     }
 252
 253     return 0;
 254 }
 255
 256 const FFInputFormat ff_smush_demuxer = {
 257     .p.name         = "smush",
 258     .p.long_name    = NULL_IF_CONFIG_SMALL("LucasArts Smush"),
 259     .priv_data_size = sizeof(SMUSHContext),
 260     .read_probe     = smush_read_probe,
 261     .read_header    = smush_read_header,
 262     .read_packet    = smush_read_packet,
 263 };