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 49typedef struct FlicDemuxContext { 50 int video_stream_index; 51 int frame_number; 52} FlicDemuxContext; 53 54static 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 80static 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 155static 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 202AVInputFormat 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}; 210