libavformat/flic.c

   1 /*
   2  * FLI/FLC Animation File Demuxer
   3  * Copyright (c) 2003 The ffmpeg Project
   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  * @file libavformat/flic.c
  24  * FLI/FLC file demuxer
  25  * by Mike Melanson (melanson@pcisys.net)
  26  * for more information on the .fli/.flc file format and all of its many
  27  * variations, visit:
  28  *   http://www.compuphase.com/flic.htm
  29  *
  30  * This demuxer handles standard 0xAF11- and 0xAF12-type FLIs. It also
  31  * handles special FLIs from the PC game "Magic Carpet".
  32  */
  33
  34 #include "libavutil/intreadwrite.h"
  35 #include "avformat.h"
  36
  37 #define FLIC_FILE_MAGIC_1 0xAF11
  38 #define FLIC_FILE_MAGIC_2 0xAF12
  39 #define FLIC_FILE_MAGIC_3 0xAF44  /* Flic Type for Extended FLX Format which
  40                                      originated in Dave's Targa Animator (DTA) */
  41 #define FLIC_CHUNK_MAGIC_1 0xF1FA
  42 #define FLIC_CHUNK_MAGIC_2 0xF5FA
  43 #define FLIC_MC_SPEED 5  /* speed for Magic Carpet game FLIs */
  44 #define FLIC_DEFAULT_SPEED 5  /* for FLIs that have 0 speed */
  45
  46 #define FLIC_HEADER_SIZE 128
  47 #define FLIC_PREAMBLE_SIZE 6
  48
  49 typedef struct FlicDemuxContext {
  50     int video_stream_index;
  51     int frame_number;
  52 } FlicDemuxContext;
  53
  54 static int flic_probe(AVProbeData *p)
  55 {
  56     int magic_number;
  57
  58     if(p->buf_size < FLIC_HEADER_SIZE)
  59         return 0;
  60
  61     magic_number = AV_RL16(&p->buf[4]);
  62     if ((magic_number != FLIC_FILE_MAGIC_1) &&
  63         (magic_number != FLIC_FILE_MAGIC_2) &&
  64         (magic_number != FLIC_FILE_MAGIC_3))
  65         return 0;
  66
  67     if(AV_RL16(&p->buf[0x10]) != FLIC_CHUNK_MAGIC_1){
  68         if(AV_RL32(&p->buf[0x10]) > 2000)
  69             return 0;
  70     }
  71
  72     if(   AV_RL16(&p->buf[0x08]) > 4096
  73        || AV_RL16(&p->buf[0x0A]) > 4096)
  74         return 0;
  75
  76
  77     return AVPROBE_SCORE_MAX;
  78 }
  79
  80 static int flic_read_header(AVFormatContext *s,
  81                             AVFormatParameters *ap)
  82 {
  83     FlicDemuxContext *flic = s->priv_data;
  84     ByteIOContext *pb = s->pb;
  85     unsigned char header[FLIC_HEADER_SIZE];
  86     AVStream *st;
  87     int speed;
  88     int magic_number;
  89
  90     flic->frame_number = 0;
  91
  92     /* load the whole header and pull out the width and height */
  93     if (get_buffer(pb, header, FLIC_HEADER_SIZE) != FLIC_HEADER_SIZE)
  94         return AVERROR(EIO);
  95
  96     magic_number = AV_RL16(&header[4]);
  97     speed = AV_RL32(&header[0x10]);
  98     if (speed == 0)
  99         speed = FLIC_DEFAULT_SPEED;
 100
 101     /* initialize the decoder streams */
 102     st = av_new_stream(s, 0);
 103     if (!st)
 104         return AVERROR(ENOMEM);
 105     flic->video_stream_index = st->index;
 106     st->codec->codec_type = CODEC_TYPE_VIDEO;
 107     st->codec->codec_id = CODEC_ID_FLIC;
 108     st->codec->codec_tag = 0;  /* no fourcc */
 109     st->codec->width = AV_RL16(&header[0x08]);
 110     st->codec->height = AV_RL16(&header[0x0A]);
 111
 112     if (!st->codec->width || !st->codec->height) {
 113         /* Ugly hack needed for the following sample: */
 114         /* http://samples.mplayerhq.hu/fli-flc/fli-bugs/specular.flc */
 115         av_log(s, AV_LOG_WARNING,
 116                "File with no specified width/height. Trying 640x480.\n");
 117         st->codec->width  = 640;
 118         st->codec->height = 480;
 119     }
 120
 121     /* send over the whole 128-byte FLIC header */
 122     st->codec->extradata_size = FLIC_HEADER_SIZE;
 123     st->codec->extradata = av_malloc(FLIC_HEADER_SIZE);
 124     memcpy(st->codec->extradata, header, FLIC_HEADER_SIZE);
 125
 126     /* Time to figure out the framerate: If there is a FLIC chunk magic
 127      * number at offset 0x10, assume this is from the Bullfrog game,
 128      * Magic Carpet. */
 129     if (AV_RL16(&header[0x10]) == FLIC_CHUNK_MAGIC_1) {
 130
 131         av_set_pts_info(st, 64, FLIC_MC_SPEED, 70);
 132
 133         /* rewind the stream since the first chunk is at offset 12 */
 134         url_fseek(pb, 12, SEEK_SET);
 135
 136         /* send over abbreviated FLIC header chunk */
 137         av_free(st->codec->extradata);
 138         st->codec->extradata_size = 12;
 139         st->codec->extradata = av_malloc(12);
 140         memcpy(st->codec->extradata, header, 12);
 141
 142     } else if (magic_number == FLIC_FILE_MAGIC_1) {
 143         av_set_pts_info(st, 64, speed, 70);
 144     } else if ((magic_number == FLIC_FILE_MAGIC_2) ||
 145                (magic_number == FLIC_FILE_MAGIC_3)) {
 146         av_set_pts_info(st, 64, speed, 1000);
 147     } else {
 148         av_log(s, AV_LOG_INFO, "Invalid or unsupported magic chunk in file\n");
 149         return AVERROR_INVALIDDATA;
 150     }
 151
 152     return 0;
 153 }
 154
 155 static int flic_read_packet(AVFormatContext *s,
 156                             AVPacket *pkt)
 157 {
 158     FlicDemuxContext *flic = s->priv_data;
 159     ByteIOContext *pb = s->pb;
 160     int packet_read = 0;
 161     unsigned int size;
 162     int magic;
 163     int ret = 0;
 164     unsigned char preamble[FLIC_PREAMBLE_SIZE];
 165
 166     while (!packet_read) {
 167
 168         if ((ret = get_buffer(pb, preamble, FLIC_PREAMBLE_SIZE)) !=
 169             FLIC_PREAMBLE_SIZE) {
 170             ret = AVERROR(EIO);
 171             break;
 172         }
 173
 174         size = AV_RL32(&preamble[0]);
 175         magic = AV_RL16(&preamble[4]);
 176
 177         if (((magic == FLIC_CHUNK_MAGIC_1) || (magic == FLIC_CHUNK_MAGIC_2)) && size > FLIC_PREAMBLE_SIZE) {
 178             if (av_new_packet(pkt, size)) {
 179                 ret = AVERROR(EIO);
 180                 break;
 181             }
 182             pkt->stream_index = flic->video_stream_index;
 183             pkt->pts = flic->frame_number++;
 184             pkt->pos = url_ftell(pb);
 185             memcpy(pkt->data, preamble, FLIC_PREAMBLE_SIZE);
 186             ret = get_buffer(pb, pkt->data + FLIC_PREAMBLE_SIZE,
 187                 size - FLIC_PREAMBLE_SIZE);
 188             if (ret != size - FLIC_PREAMBLE_SIZE) {
 189                 av_free_packet(pkt);
 190                 ret = AVERROR(EIO);
 191             }
 192             packet_read = 1;
 193         } else {
 194             /* not interested in this chunk */
 195             url_fseek(pb, size - 6, SEEK_CUR);
 196         }
 197     }
 198
 199     return ret;
 200 }
 201
 202 AVInputFormat flic_demuxer = {
 203     "flic",
 204     NULL_IF_CONFIG_SMALL("FLI/FLC/FLX animation format"),
 205     sizeof(FlicDemuxContext),
 206     flic_probe,
 207     flic_read_header,
 208     flic_read_packet,
 209 };